{"id":4952,"date":"2026-01-23T09:39:48","date_gmt":"2026-01-23T01:39:48","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=4952"},"modified":"2026-01-23T09:39:54","modified_gmt":"2026-01-23T01:39:54","slug":"short-circuit-rating-why-is-the-short-circuit-temperature-for-3gi3-epr-insulated-vde-cables-set-at-250c-and-how-does-this-impact-screen-sizing-for-ntscgecewou","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/short-circuit-rating-why-is-the-short-circuit-temperature-for-3gi3-epr-insulated-vde-cables-set-at-250c-and-how-does-this-impact-screen-sizing-for-ntscgecewou\/","title":{"rendered":"Short-Circuit Rating: Why is the Short-Circuit Temperature for 3GI3 EPR-Insulated VDE Cables Set at 250\u00b0C, and How Does This Impact Screen Sizing for (N)TSCGECEW\u00d6U?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>\u77ed\u8def\u989d\u5b9a\u503c\uff1a\u4e3a\u4ec0\u4e483GI3 EPR\u7edd\u7f18VDE\u7535\u7f06\u7684\u77ed\u8def\u6e29\u5ea6\u8bbe\u5b9a\u4e3a250\u00b0C\uff0c\u8fd9\u5bf9(N)TSCGECEW\u00d6U\u7684\u5c4f\u853d\u5c42\u5c3a\u5bf8\u6709\u4f55\u5f71\u54cd\uff1f<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img data-dominant-color=\"788691\" data-has-transparency=\"false\" loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"628\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" src=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-583-474x628.avif\" alt=\"\" class=\"wp-image-4953 not-transparent\" style=\"--dominant-color: #788691; width:640px;height:auto\" title=\"\" srcset=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-583-474x628.avif 474w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-583-226x300.avif 226w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-583-400x530.avif 400w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-583.avif 538w\" \/><\/figure>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <meta name=\"description\" content=\"Technical analysis of why 3GI3 EPR-insulated VDE cables have a 250\u00b0C short-circuit temperature limit and how this impacts screen sizing calculations for (N)TSCGECEW\u00d6U mining cables per IEC 60949 and IEC 60364-5-54.\">\n    <meta name=\"keywords\" content=\"3GI3 EPR insulation, short circuit temperature 250\u00b0C, NTSCGECEWOU cable, VDE 0250, screen sizing, K factor, IEC 60949, mining cable, adiabatic calculation\">\n    <title>Short-Circuit Rating: Why 250\u00b0C for 3GI3 EPR and Screen Sizing for (N)TSCGECEW\u00d6U | Anhui Feichun Special Cable<\/title>\n<\/head>\n<body>\n\n<article>\n    <header>\n        <h1>Short-Circuit Rating: Why is the Short-Circuit Temperature for 3GI3 EPR-Insulated VDE Cables Set at 250\u00b0C, and How Does This Impact Screen Sizing for (N)TSCGECEW\u00d6U?<\/h1>\n        <p><em>\u77ed\u8def\u989d\u5b9a\u503c\uff1a\u4e3a\u4ec0\u4e483GI3 EPR\u7edd\u7f18VDE\u7535\u7f06\u7684\u77ed\u8def\u6e29\u5ea6\u8bbe\u5b9a\u4e3a250\u00b0C\uff0c\u8fd9\u5bf9(N)TSCGECEW\u00d6U\u7684\u5c4f\u853d\u5c42\u5c3a\u5bf8\u6709\u4f55\u5f71\u54cd\uff1f<\/em><\/p>\n        \n        <p><strong>Technical Analysis by Anhui Feichun Special Cable Co., Ltd.<\/strong><br>\n        <em>\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8\u6280\u672f\u5206\u6790<\/em><\/p>\n    <\/header>\n\n    <nav>\n        <h2>Contents \u76ee\u5f55<\/h2>\n        <ul>\n            <li><a href=\"#introduction\">1. Introduction \u5f15\u8a00<\/a><\/li>\n            <li><a href=\"#thermal-limits\">2. Understanding Insulation Thermal Limits \u4e86\u89e3\u7edd\u7f18\u70ed\u6781\u9650<\/a><\/li>\n            <li><a href=\"#why-250c\">3. Why 250\u00b0C for 3GI3 EPR Insulation \u4e3a\u4ec0\u4e483GI3 EPR\u7edd\u7f18\u662f250\u00b0C<\/a><\/li>\n            <li><a href=\"#adiabatic-principle\">4. The Adiabatic Calculation Principle \u7edd\u70ed\u8ba1\u7b97\u539f\u7406<\/a><\/li>\n            <li><a href=\"#k-factor\">5. The K-Factor and Its Derivation K\u56e0\u5b50\u53ca\u5176\u63a8\u5bfc<\/a><\/li>\n            <li><a href=\"#screen-sizing\">6. Screen Sizing for (N)TSCGECEW\u00d6U Cables (N)TSCGECEW\u00d6U\u7535\u7f06\u7684\u5c4f\u853d\u5c42\u5c3a\u5bf8<\/a><\/li>\n            <li><a href=\"#practical-calculation\">7. Practical Calculation Example \u5b9e\u9645\u8ba1\u7b97\u793a\u4f8b<\/a><\/li>\n            <li><a href=\"#design-implications\">8. Design Implications for Mining Cables \u77ff\u7528\u7535\u7f06\u7684\u8bbe\u8ba1\u5f71\u54cd<\/a><\/li>\n            <li><a href=\"#standards-reference\">9. Applicable Standards Reference \u9002\u7528\u6807\u51c6\u53c2\u8003<\/a><\/li>\n            <li><a href=\"#conclusion\">10. Conclusion \u7ed3\u8bba<\/a><\/li>\n            <li><a href=\"#contact\">11. Contact Information \u8054\u7cfb\u65b9\u5f0f<\/a><\/li>\n        <\/ul>\n    <\/nav>\n\n    <section id=\"introduction\">\n        <h2>1. Introduction \u5f15\u8a00<\/h2>\n        \n        <p>In the design of medium voltage mining and reeling cables such as the (N)TSCGECEW\u00d6U, the short-circuit temperature rating of the insulation material fundamentally determines the cable&#8217;s fault current withstand capability. The 3GI3 EPR (Ethylene Propylene Rubber) compound specified in DIN VDE 0207 Part 20 has a maximum permissible short-circuit temperature of 250\u00b0C, which directly influences how engineers must size the metallic screen to safely conduct earth fault currents without thermal damage.<\/p>\n        \n        <p><em>\u5728\u8bbe\u8ba1\u8bf8\u5982(N)TSCGECEW\u00d6U\u7b49\u4e2d\u538b\u77ff\u7528\u548c\u5377\u7b52\u7535\u7f06\u65f6\uff0c\u7edd\u7f18\u6750\u6599\u7684\u77ed\u8def\u6e29\u5ea6\u989d\u5b9a\u503c\u4ece\u6839\u672c\u4e0a\u51b3\u5b9a\u4e86\u7535\u7f06\u7684\u6545\u969c\u7535\u6d41\u627f\u53d7\u80fd\u529b\u3002DIN VDE 0207\u7b2c20\u90e8\u5206\u89c4\u5b9a\u76843GI3 EPR\uff08\u4e59\u4e19\u6a61\u80f6\uff09\u5316\u5408\u7269\u7684\u6700\u5927\u5141\u8bb8\u77ed\u8def\u6e29\u5ea6\u4e3a250\u00b0C\uff0c\u8fd9\u76f4\u63a5\u5f71\u54cd\u5de5\u7a0b\u5e08\u5fc5\u987b\u5982\u4f55\u786e\u5b9a\u91d1\u5c5e\u5c4f\u853d\u5c42\u7684\u5c3a\u5bf8\uff0c\u4ee5\u5b89\u5168\u4f20\u5bfc\u63a5\u5730\u6545\u969c\u7535\u6d41\u800c\u4e0d\u4f1a\u9020\u6210\u70ed\u635f\u574f\u3002<\/em><\/p>\n\n        <p>This technical analysis explains the thermodynamic basis for the 250\u00b0C limit, demonstrates the calculation methodology per IEC 60949 and IEC 60364-5-54, and shows how the (N)TSCGECEW\u00d6U cable&#8217;s copper wire braid screen must be sized to meet specified fault current requirements in mining applications.<\/p>\n        \n        <p><em>\u672c\u6280\u672f\u5206\u6790\u89e3\u91ca\u4e86250\u00b0C\u9650\u503c\u7684\u70ed\u529b\u5b66\u57fa\u7840\uff0c\u6f14\u793a\u4e86\u6839\u636eIEC 60949\u548cIEC 60364-5-54\u7684\u8ba1\u7b97\u65b9\u6cd5\uff0c\u5e76\u5c55\u793a\u4e86(N)TSCGECEW\u00d6U\u7535\u7f06\u7684\u94dc\u4e1d\u7f16\u7ec7\u5c4f\u853d\u5c42\u5fc5\u987b\u5982\u4f55\u786e\u5b9a\u5c3a\u5bf8\u4ee5\u6ee1\u8db3\u91c7\u77ff\u5e94\u7528\u4e2d\u89c4\u5b9a\u7684\u6545\u969c\u7535\u6d41\u8981\u6c42\u3002<\/em><\/p>\n\n        <p>Sources:<\/p>\n        <ul>\n            <li><a href=\"https:\/\/www.prysmian.com\/sites\/default\/files\/business_markets\/markets\/downloads\/datasheets\/Medium-Voltage-Round.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Prysmian PROTOLON Medium Voltage Reeling Cable Technical Data<\/a><\/li>\n            <li><a href=\"https:\/\/www.elandcables.com\/cables\/n-tscgecewou-cables-en\" rel=\"nofollow noopener\" target=\"_blank\">Eland Cables &#8211; (N)TSCGECEW\u00d6U Cable Specifications<\/a><\/li>\n        <\/ul>\n    <\/section>\n\n    <section id=\"thermal-limits\">\n        <h2>2. Understanding Insulation Thermal Limits \u4e86\u89e3\u7edd\u7f18\u70ed\u6781\u9650<\/h2>\n        \n        <p>Every cable insulation material has three critical temperature thresholds that define its operational envelope. These temperatures are determined by the material&#8217;s molecular structure and its ability to maintain dielectric integrity under thermal stress. For 3GI3 EPR compound used in VDE mining cables, these thresholds represent carefully established limits beyond which the insulation risks permanent degradation.<\/p>\n        \n        <p><em>\u6bcf\u79cd\u7535\u7f06\u7edd\u7f18\u6750\u6599\u90fd\u6709\u4e09\u4e2a\u5173\u952e\u6e29\u5ea6\u9608\u503c\uff0c\u5b9a\u4e49\u5176\u64cd\u4f5c\u8303\u56f4\u3002\u8fd9\u4e9b\u6e29\u5ea6\u7531\u6750\u6599\u7684\u5206\u5b50\u7ed3\u6784\u53ca\u5176\u5728\u70ed\u5e94\u529b\u4e0b\u4fdd\u6301\u4ecb\u7535\u5b8c\u6574\u6027\u7684\u80fd\u529b\u51b3\u5b9a\u3002\u5bf9\u4e8eVDE\u77ff\u7528\u7535\u7f06\u4e2d\u4f7f\u7528\u76843GI3 EPR\u5316\u5408\u7269\uff0c\u8fd9\u4e9b\u9608\u503c\u4ee3\u8868\u4e86\u7ecf\u8fc7\u4ed4\u7ec6\u786e\u5b9a\u7684\u6781\u9650\uff0c\u8d85\u8fc7\u8be5\u6781\u9650\u7edd\u7f18\u6709\u6c38\u4e45\u964d\u89e3\u7684\u98ce\u9669\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 1: Temperature Ratings for Common Cable Insulation Materials<\/strong><br><em>\u88681\uff1a\u5e38\u89c1\u7535\u7f06\u7edd\u7f18\u6750\u6599\u7684\u6e29\u5ea6\u989d\u5b9a\u503c<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Insulation Type<br><em>\u7edd\u7f18\u7c7b\u578b<\/em><\/th>\n                    <th>Continuous Operation<br><em>\u6301\u7eed\u8fd0\u884c<\/em><\/th>\n                    <th>Emergency Overload<br><em>\u7d27\u6025\u8fc7\u8f7d<\/em><\/th>\n                    <th>Short-Circuit Maximum<br><em>\u77ed\u8def\u6700\u5927\u503c<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>PVC (Thermoplastic)<br><em>PVC\uff08\u70ed\u5851\u6027\uff09<\/em><\/td>\n                    <td>70\u00b0C<\/td>\n                    <td>100\u00b0C<\/td>\n                    <td>160\u00b0C (\u2264300mm\u00b2) \/ 140\u00b0C (&gt;300mm\u00b2)<\/td>\n                <\/tr>\n                <tr>\n                    <td>90\u00b0C PVC (High-Temp)<br><em>90\u00b0C PVC\uff08\u9ad8\u6e29\u578b\uff09<\/em><\/td>\n                    <td>90\u00b0C<\/td>\n                    <td>110\u00b0C<\/td>\n                    <td>160\u00b0C \/ 140\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>3GI3 EPR (VDE 0207-20)<\/strong><br><em><strong>3GI3 EPR<\/strong><\/em><\/td>\n                    <td><strong>90\u00b0C<\/strong><\/td>\n                    <td><strong>130-140\u00b0C<\/strong><\/td>\n                    <td><strong>250\u00b0C<\/strong><\/td>\n                <\/tr>\n                <tr>\n                    <td>XLPE (Cross-Linked PE)<br><em>XLPE\uff08\u4ea4\u8054\u805a\u4e59\u70ef\uff09<\/em><\/td>\n                    <td>90\u00b0C<\/td>\n                    <td>130\u00b0C<\/td>\n                    <td>250\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td>EPR 105\u00b0C Grade<br><em>EPR 105\u00b0C\u7b49\u7ea7<\/em><\/td>\n                    <td>105\u00b0C<\/td>\n                    <td>140\u00b0C<\/td>\n                    <td>250\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td>Silicone Rubber<br><em>\u7845\u6a61\u80f6<\/em><\/td>\n                    <td>180\u00b0C<\/td>\n                    <td>220\u00b0C<\/td>\n                    <td>350\u00b0C<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <p>The significantly higher short-circuit temperature of thermosetting insulations (EPR, XLPE) compared to thermoplastic PVC reflects the fundamental difference in their molecular structures. Thermosetting materials have cross-linked polymer chains that maintain structural integrity at elevated temperatures, while thermoplastic PVC softens and deforms, potentially causing insulation displacement and dielectric failure.<\/p>\n        \n        <p><em>\u70ed\u56fa\u6027\u7edd\u7f18\uff08EPR\u3001XLPE\uff09\u7684\u77ed\u8def\u6e29\u5ea6\u660e\u663e\u9ad8\u4e8e\u70ed\u5851\u6027PVC\uff0c\u8fd9\u53cd\u6620\u4e86\u5b83\u4eec\u5206\u5b50\u7ed3\u6784\u7684\u6839\u672c\u5dee\u5f02\u3002\u70ed\u56fa\u6027\u6750\u6599\u5177\u6709\u4ea4\u8054\u805a\u5408\u7269\u94fe\uff0c\u53ef\u5728\u9ad8\u6e29\u4e0b\u4fdd\u6301\u7ed3\u6784\u5b8c\u6574\u6027\uff0c\u800c\u70ed\u5851\u6027PVC\u4f1a\u8f6f\u5316\u548c\u53d8\u5f62\uff0c\u53ef\u80fd\u5bfc\u81f4\u7edd\u7f18\u4f4d\u79fb\u548c\u4ecb\u7535\u5931\u6548\u3002<\/em><\/p>\n\n        <p>Sources:<\/p>\n        <ul>\n            <li><a href=\"https:\/\/wiki.openelectrical.org\/index.php?title=Adiabatic_Short_Circuit_Temperature_Rise\" rel=\"nofollow noopener\" target=\"_blank\">Open Electrical &#8211; Adiabatic Short Circuit Temperature Rise<\/a><\/li>\n            <li><a href=\"https:\/\/uk.prysmian.com\/sites\/uk.prysmian.com\/files\/media\/documents\/Cable%20Short%20Circuit%20Ratings%20(1).pdf\" rel=\"nofollow noopener\" target=\"_blank\">Prysmian UK &#8211; Cable Short Circuit Ratings Technical Guide<\/a><\/li>\n        <\/ul>\n    <\/section>\n\n    <section id=\"why-250c\">\n        <h2>3. Why 250\u00b0C for 3GI3 EPR Insulation \u4e3a\u4ec0\u4e483GI3 EPR\u7edd\u7f18\u662f250\u00b0C<\/h2>\n        \n        <p>The 250\u00b0C short-circuit temperature limit for 3GI3 EPR insulation is not arbitrary but derives from extensive thermal aging studies and the material&#8217;s cross-linking chemistry. EPR (Ethylene Propylene Rubber) is a copolymer of ethylene and propylene monomers that undergoes vulcanization (cross-linking) during cable manufacturing. This cross-linking process creates a three-dimensional molecular network that provides thermal stability far beyond that of thermoplastic materials.<\/p>\n        \n        <p><em>3GI3 EPR\u7edd\u7f18\u7684250\u00b0C\u77ed\u8def\u6e29\u5ea6\u9650\u5236\u4e0d\u662f\u4efb\u610f\u7684\uff0c\u800c\u662f\u6765\u6e90\u4e8e\u5e7f\u6cdb\u7684\u70ed\u8001\u5316\u7814\u7a76\u548c\u6750\u6599\u7684\u4ea4\u8054\u5316\u5b66\u3002EPR\uff08\u4e59\u4e19\u6a61\u80f6\uff09\u662f\u4e59\u70ef\u548c\u4e19\u70ef\u5355\u4f53\u7684\u5171\u805a\u7269\uff0c\u5728\u7535\u7f06\u5236\u9020\u8fc7\u7a0b\u4e2d\u7ecf\u8fc7\u786b\u5316\uff08\u4ea4\u8054\uff09\u3002\u8fd9\u79cd\u4ea4\u8054\u8fc7\u7a0b\u521b\u5efa\u4e86\u4e09\u7ef4\u5206\u5b50\u7f51\u7edc\uff0c\u63d0\u4f9b\u4e86\u8fdc\u8d85\u70ed\u5851\u6027\u6750\u6599\u7684\u70ed\u7a33\u5b9a\u6027\u3002<\/em><\/p>\n\n        <h3>3.1 Material Science Basis \u6750\u6599\u79d1\u5b66\u57fa\u7840<\/h3>\n        \n        <p>The 3GI3 designation in DIN VDE 0207 Part 20 specifies a high-grade EPR compound with enhanced mechanical and electrical characteristics suitable for flexible cables under demanding conditions. The &#8220;3&#8221; prefix indicates a rubber-based insulation, &#8220;G&#8221; denotes general purpose application, &#8220;I&#8221; signifies insulation compound, and &#8220;3&#8221; represents the specific formulation grade.<\/p>\n        \n        <p><em>DIN VDE 0207\u7b2c20\u90e8\u5206\u4e2d\u76843GI3\u540d\u79f0\u6307\u5b9a\u4e86\u4e00\u79cd\u9ad8\u7b49\u7ea7EPR\u5316\u5408\u7269\uff0c\u5177\u6709\u589e\u5f3a\u7684\u673a\u68b0\u548c\u7535\u6c14\u7279\u6027\uff0c\u9002\u7528\u4e8e\u8981\u6c42\u82db\u523b\u6761\u4ef6\u4e0b\u7684\u67d4\u6027\u7535\u7f06\u3002&#8221;3&#8243;\u524d\u7f00\u8868\u793a\u57fa\u4e8e\u6a61\u80f6\u7684\u7edd\u7f18\uff0c&#8221;G&#8221;\u8868\u793a\u901a\u7528\u5e94\u7528\uff0c&#8221;I&#8221;\u8868\u793a\u7edd\u7f18\u5316\u5408\u7269\uff0c&#8221;3&#8243;\u4ee3\u8868\u7279\u5b9a\u914d\u65b9\u7b49\u7ea7\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 2: 3GI3 EPR Compound Properties per DIN VDE 0207 Part 20<\/strong><br><em>\u88682\uff1aDIN VDE 0207\u7b2c20\u90e8\u5206\u76843GI3 EPR\u5316\u5408\u7269\u6027\u80fd<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Property<br><em>\u6027\u80fd<\/em><\/th>\n                    <th>Requirement<br><em>\u8981\u6c42<\/em><\/th>\n                    <th>Test Standard<br><em>\u6d4b\u8bd5\u6807\u51c6<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Tensile Strength (min.)<br><em>\u62c9\u4f38\u5f3a\u5ea6\uff08\u6700\u5c0f\uff09<\/em><\/td>\n                    <td>\u22655 N\/mm\u00b2<\/td>\n                    <td>DIN VDE 0472<\/td>\n                <\/tr>\n                <tr>\n                    <td>Elongation at Break (min.)<br><em>\u65ad\u88c2\u4f38\u957f\u7387\uff08\u6700\u5c0f\uff09<\/em><\/td>\n                    <td>\u2265200%<\/td>\n                    <td>DIN VDE 0472<\/td>\n                <\/tr>\n                <tr>\n                    <td>Continuous Operating Temperature<br><em>\u6301\u7eed\u5de5\u4f5c\u6e29\u5ea6<\/em><\/td>\n                    <td>90\u00b0C<\/td>\n                    <td>DIN VDE 0207-20<\/td>\n                <\/tr>\n                <tr>\n                    <td>Maximum Short-Circuit Temperature<br><em>\u6700\u5927\u77ed\u8def\u6e29\u5ea6<\/em><\/td>\n                    <td><strong>250\u00b0C<\/strong><\/td>\n                    <td>DIN VDE 0207-20<\/td>\n                <\/tr>\n                <tr>\n                    <td>Ozone Resistance<br><em>\u8010\u81ed\u6c27\u6027<\/em><\/td>\n                    <td>No cracking after 72h<\/td>\n                    <td>DIN EN 60811-403<\/td>\n                <\/tr>\n                <tr>\n                    <td>Volume Resistivity (min.)<br><em>\u4f53\u79ef\u7535\u963b\u7387\uff08\u6700\u5c0f\uff09<\/em><\/td>\n                    <td>\u226510\u00b9\u00b2 \u03a9\u00b7cm<\/td>\n                    <td>DIN VDE 0472<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>3.2 Thermal Degradation Mechanism \u70ed\u964d\u89e3\u673a\u5236<\/h3>\n        \n        <p>At temperatures approaching and exceeding 250\u00b0C, EPR insulation begins to experience accelerated thermal oxidation and chain scission of the polymer backbone. While the material does not melt (unlike thermoplastics), prolonged exposure above this threshold causes irreversible chemical degradation that compromises dielectric strength and mechanical properties. The 250\u00b0C limit represents the temperature at which short-duration exposure (typically less than 5 seconds) causes acceptable, recoverable stress without permanent insulation damage.<\/p>\n        \n        <p><em>\u5f53\u6e29\u5ea6\u63a5\u8fd1\u5e76\u8d85\u8fc7250\u00b0C\u65f6\uff0cEPR\u7edd\u7f18\u5f00\u59cb\u7ecf\u5386\u52a0\u901f\u7684\u70ed\u6c27\u5316\u548c\u805a\u5408\u7269\u4e3b\u94fe\u7684\u94fe\u65ad\u88c2\u3002\u867d\u7136\u6750\u6599\u4e0d\u4f1a\u7194\u5316\uff08\u4e0e\u70ed\u5851\u6027\u5851\u6599\u4e0d\u540c\uff09\uff0c\u4f46\u957f\u65f6\u95f4\u66b4\u9732\u5728\u8be5\u9608\u503c\u4ee5\u4e0a\u4f1a\u5bfc\u81f4\u4e0d\u53ef\u9006\u7684\u5316\u5b66\u964d\u89e3\uff0c\u4ece\u800c\u635f\u5bb3\u4ecb\u7535\u5f3a\u5ea6\u548c\u673a\u68b0\u6027\u80fd\u3002250\u00b0C\u9650\u5236\u4ee3\u8868\u77ed\u65f6\u95f4\u66b4\u9732\uff08\u901a\u5e38\u5c11\u4e8e5\u79d2\uff09\u5bfc\u81f4\u53ef\u63a5\u53d7\u7684\u3001\u53ef\u6062\u590d\u7684\u5e94\u529b\u800c\u4e0d\u4f1a\u9020\u6210\u6c38\u4e45\u6027\u7edd\u7f18\u635f\u574f\u7684\u6e29\u5ea6\u3002<\/em><\/p>\n\n        <p>Sources:<\/p>\n        <ul>\n            <li><a href=\"https:\/\/www.aristoncavi.com\/wp-content\/uploads\/2019\/02\/ARISTONCAVI_catalogo-acqua_2016_imps_bassa-ris-1.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Aristoncavi &#8211; Submersible Cable Technical Catalog (3GI3 specifications)<\/a><\/li>\n            <li><a href=\"https:\/\/m.zmscable.com\/new\/What-is-the-difference-between-EPR-and-FR-XLPE-cables\" rel=\"nofollow noopener\" target=\"_blank\">ZMS Cable &#8211; EPR vs XLPE Technical Comparison<\/a><\/li>\n        <\/ul>\n    <\/section>\n\n    <section id=\"adiabatic-principle\">\n        <h2>4. The Adiabatic Calculation Principle \u7edd\u70ed\u8ba1\u7b97\u539f\u7406<\/h2>\n        \n        <p>Short-circuit current calculations for cable sizing are based on the adiabatic assumption, which states that during a fault of short duration, all heat generated by the I\u00b2R losses in the conductor or screen is retained within the metallic component without any heat transfer to the surrounding insulation or environment. This assumption is conservative and places the calculation on the safe side.<\/p>\n        \n        <p><em>\u7535\u7f06\u5c3a\u5bf8\u7684\u77ed\u8def\u7535\u6d41\u8ba1\u7b97\u57fa\u4e8e\u7edd\u70ed\u5047\u8bbe\uff0c\u8be5\u5047\u8bbe\u6307\u51fa\u5728\u77ed\u65f6\u95f4\u6545\u969c\u671f\u95f4\uff0c\u5bfc\u4f53\u6216\u5c4f\u853d\u5c42\u4e2dI\u00b2R\u635f\u8017\u4ea7\u751f\u7684\u6240\u6709\u70ed\u91cf\u90fd\u4fdd\u7559\u5728\u91d1\u5c5e\u90e8\u4ef6\u5185\uff0c\u4e0d\u4f1a\u4f20\u9012\u5230\u5468\u56f4\u7684\u7edd\u7f18\u6216\u73af\u5883\u4e2d\u3002\u8fd9\u79cd\u5047\u8bbe\u662f\u4fdd\u5b88\u7684\uff0c\u4f7f\u8ba1\u7b97\u5904\u4e8e\u5b89\u5168\u4e00\u4fa7\u3002<\/em><\/p>\n\n        <h3>4.1 Fundamental Energy Balance \u57fa\u672c\u80fd\u91cf\u5e73\u8861<\/h3>\n        \n        <p>The adiabatic temperature rise derives from the basic energy balance equation where the electrical energy dissipated during the fault equals the thermal energy stored in the conductor. The governing equation per IEC 60949 is expressed as follows:<\/p>\n        \n        <p><em>\u7edd\u70ed\u6e29\u5ea6\u4e0a\u5347\u6e90\u81ea\u57fa\u672c\u80fd\u91cf\u5e73\u8861\u65b9\u7a0b\uff0c\u5176\u4e2d\u6545\u969c\u671f\u95f4\u8017\u6563\u7684\u7535\u80fd\u7b49\u4e8e\u5b58\u50a8\u5728\u5bfc\u4f53\u4e2d\u7684\u70ed\u80fd\u3002\u6839\u636eIEC 60949\u7684\u63a7\u5236\u65b9\u7a0b\u8868\u793a\u5982\u4e0b\uff1a<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 3: Adiabatic Short-Circuit Equation Components<\/strong><br><em>\u88683\uff1a\u7edd\u70ed\u77ed\u8def\u65b9\u7a0b\u7ec4\u6210\u90e8\u5206<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Variable<br><em>\u53d8\u91cf<\/em><\/th>\n                    <th>Description<br><em>\u63cf\u8ff0<\/em><\/th>\n                    <th>Unit<br><em>\u5355\u4f4d<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>I<\/td>\n                    <td>Short-circuit current (RMS)<br><em>\u77ed\u8def\u7535\u6d41\uff08\u6709\u6548\u503c\uff09<\/em><\/td>\n                    <td>A (Amperes)<\/td>\n                <\/tr>\n                <tr>\n                    <td>t<\/td>\n                    <td>Fault duration<br><em>\u6545\u969c\u6301\u7eed\u65f6\u95f4<\/em><\/td>\n                    <td>s (seconds)<\/td>\n                <\/tr>\n                <tr>\n                    <td>A (or S)<\/td>\n                    <td>Cross-sectional area of conductor\/screen<br><em>\u5bfc\u4f53\/\u5c4f\u853d\u5c42\u7684\u6a2a\u622a\u9762\u79ef<\/em><\/td>\n                    <td>mm\u00b2<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03b8\u1d62<\/td>\n                    <td>Initial conductor temperature<br><em>\u5bfc\u4f53\u521d\u59cb\u6e29\u5ea6<\/em><\/td>\n                    <td>\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03b8f<\/td>\n                    <td>Final (maximum) conductor temperature<br><em>\u5bfc\u4f53\u6700\u7ec8\uff08\u6700\u9ad8\uff09\u6e29\u5ea6<\/em><\/td>\n                    <td>\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td>k<\/td>\n                    <td>Material constant (derived from thermal properties)<br><em>\u6750\u6599\u5e38\u6570\uff08\u7531\u70ed\u6027\u80fd\u63a8\u5bfc\uff09<\/em><\/td>\n                    <td>A\u00b7s<sup>0.5<\/sup>\/mm\u00b2<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <p>The fundamental adiabatic equation relates the short-circuit current, duration, and conductor area through the relationship: <strong>A = (I \u00d7 \u221at) \/ k<\/strong>, where k is dependent on the conductor material and the allowable temperature rise (\u03b8f &#8211; \u03b8\u1d62).<\/p>\n        \n        <p><em>\u57fa\u672c\u7edd\u70ed\u65b9\u7a0b\u901a\u8fc7\u4ee5\u4e0b\u5173\u7cfb\u5c06\u77ed\u8def\u7535\u6d41\u3001\u6301\u7eed\u65f6\u95f4\u548c\u5bfc\u4f53\u9762\u79ef\u8054\u7cfb\u8d77\u6765\uff1a<strong>A = (I \u00d7 \u221at) \/ k<\/strong>\uff0c\u5176\u4e2dk\u53d6\u51b3\u4e8e\u5bfc\u4f53\u6750\u6599\u548c\u5141\u8bb8\u7684\u6e29\u5ea6\u5347\u9ad8\uff08\u03b8f &#8211; \u03b8\u1d62\uff09\u3002<\/em><\/p>\n\n        <p>Source: <a href=\"https:\/\/standards.globalspec.com\/std\/1160909\/iec-60949\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60949 &#8211; Calculation of thermally permissible short-circuit currents<\/a><\/p>\n    <\/section>\n\n    <section id=\"k-factor\">\n        <h2>5. The K-Factor and Its Derivation K\u56e0\u5b50\u53ca\u5176\u63a8\u5bfc<\/h2>\n        \n        <p>The k-factor is the critical parameter linking conductor material properties to short-circuit withstand capability. It incorporates the volumetric heat capacity, electrical resistivity, and temperature coefficient of resistance of the conductor material. The k-factor is calculated using the formula specified in IEC 60364-5-54 Annex A.<\/p>\n        \n        <p><em>k\u56e0\u5b50\u662f\u5c06\u5bfc\u4f53\u6750\u6599\u6027\u80fd\u4e0e\u77ed\u8def\u8010\u53d7\u80fd\u529b\u8054\u7cfb\u8d77\u6765\u7684\u5173\u952e\u53c2\u6570\u3002\u5b83\u5305\u542b\u4e86\u5bfc\u4f53\u6750\u6599\u7684\u4f53\u79ef\u70ed\u5bb9\u3001\u7535\u963b\u7387\u548c\u7535\u963b\u6e29\u5ea6\u7cfb\u6570\u3002k\u56e0\u5b50\u4f7f\u7528IEC 60364-5-54\u9644\u5f55A\u4e2d\u89c4\u5b9a\u7684\u516c\u5f0f\u8ba1\u7b97\u3002<\/em><\/p>\n\n        <h3>5.1 K-Factor Formula K\u56e0\u5b50\u516c\u5f0f<\/h3>\n        \n        <p>The k-factor is derived from the following equation, which accounts for the temperature-dependent resistance of the conductor:<\/p>\n        \n        <p><em>k\u56e0\u5b50\u7531\u4ee5\u4e0b\u65b9\u7a0b\u63a8\u5bfc\uff0c\u8be5\u65b9\u7a0b\u8003\u8651\u4e86\u5bfc\u4f53\u7684\u6e29\u5ea6\u76f8\u5173\u7535\u963b\uff1a<\/em><\/p>\n\n        <p><strong>k = \u221a[(Qc \u00d7 (\u03b2 + 20)) \/ \u03c1\u2082\u2080 \u00d7 ln((\u03b2 + \u03b8f) \/ (\u03b2 + \u03b8\u1d62))]<\/strong><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 4: K-Factor Formula Parameters<\/strong><br><em>\u88684\uff1aK\u56e0\u5b50\u516c\u5f0f\u53c2\u6570<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Parameter<br><em>\u53c2\u6570<\/em><\/th>\n                    <th>Description<br><em>\u63cf\u8ff0<\/em><\/th>\n                    <th>Copper Value<br><em>\u94dc\u503c<\/em><\/th>\n                    <th>Aluminium Value<br><em>\u94dd\u503c<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Qc<\/td>\n                    <td>Volumetric heat capacity at 20\u00b0C<br><em>20\u00b0C\u65f6\u7684\u4f53\u79ef\u70ed\u5bb9<\/em><\/td>\n                    <td>3.45 \u00d7 10\u207b\u00b3 J\/(K\u00b7mm\u00b3)<\/td>\n                    <td>2.5 \u00d7 10\u207b\u00b3 J\/(K\u00b7mm\u00b3)<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03b2<\/td>\n                    <td>Reciprocal of temperature coefficient at 0\u00b0C<br><em>0\u00b0C\u65f6\u6e29\u5ea6\u7cfb\u6570\u7684\u5012\u6570<\/em><\/td>\n                    <td>234.5\u00b0C<\/td>\n                    <td>228\u00b0C<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03c1\u2082\u2080<\/td>\n                    <td>Electrical resistivity at 20\u00b0C<br><em>20\u00b0C\u65f6\u7684\u7535\u963b\u7387<\/em><\/td>\n                    <td>17.241 \u00d7 10\u207b\u2076 \u03a9\u00b7mm<\/td>\n                    <td>28.267 \u00d7 10\u207b\u2076 \u03a9\u00b7mm<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03b8\u1d62<\/td>\n                    <td>Initial temperature (screen at ambient)<br><em>\u521d\u59cb\u6e29\u5ea6\uff08\u5c4f\u853d\u5c42\u5728\u73af\u5883\u6e29\u5ea6\uff09<\/em><\/td>\n                    <td colspan=\"2\">30\u00b0C (typical for screen not incorporated in cable)<\/td>\n                <\/tr>\n                <tr>\n                    <td>\u03b8f<\/td>\n                    <td>Final temperature (limited by insulation)<br><em>\u6700\u7ec8\u6e29\u5ea6\uff08\u53d7\u7edd\u7f18\u9650\u5236\uff09<\/em><\/td>\n                    <td colspan=\"2\"><strong>250\u00b0C for 3GI3 EPR<\/strong><\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>5.2 Standard K-Factor Values \u6807\u51c6K\u56e0\u5b50\u503c<\/h3>\n        \n        <p>IEC 60364-5-54 Table A.54.2 provides pre-calculated k-values for common insulation\/conductor combinations. For copper conductors with 90\u00b0C thermosetting insulation (EPR\/XLPE) with a 250\u00b0C short-circuit limit, the standard k-factor is 176.<\/p>\n        \n        <p><em>IEC 60364-5-54\u8868A.54.2\u4e3a\u5e38\u89c1\u7684\u7edd\u7f18\/\u5bfc\u4f53\u7ec4\u5408\u63d0\u4f9b\u4e86\u9884\u5148\u8ba1\u7b97\u7684k\u503c\u3002\u5bf9\u4e8e\u5177\u6709250\u00b0C\u77ed\u8def\u9650\u5236\u768490\u00b0C\u70ed\u56fa\u6027\u7edd\u7f18\uff08EPR\/XLPE\uff09\u94dc\u5bfc\u4f53\uff0c\u6807\u51c6k\u56e0\u5b50\u4e3a176\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 5: K-Factor Values per IEC 60364-5-54 Table A.54.2<\/strong><br><em>\u88685\uff1aIEC 60364-5-54\u8868A.54.2\u7684K\u56e0\u5b50\u503c<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Insulation Type<br><em>\u7edd\u7f18\u7c7b\u578b<\/em><\/th>\n                    <th>Initial Temp.<br><em>\u521d\u59cb\u6e29\u5ea6<\/em><\/th>\n                    <th>Final Temp.<br><em>\u6700\u7ec8\u6e29\u5ea6<\/em><\/th>\n                    <th>k (Copper)<br><em>k\uff08\u94dc\uff09<\/em><\/th>\n                    <th>k (Aluminium)<br><em>k\uff08\u94dd\uff09<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>70\u00b0C PVC<br><em>70\u00b0C PVC<\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td>160\/140\u00b0C<\/td>\n                    <td>143\/133<\/td>\n                    <td>95\/88<\/td>\n                <\/tr>\n                <tr>\n                    <td>90\u00b0C PVC<br><em>90\u00b0C PVC<\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td>160\/140\u00b0C<\/td>\n                    <td>143\/133<\/td>\n                    <td>95\/88<\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>90\u00b0C Thermosetting (EPR\/XLPE)<\/strong><br><em><strong>90\u00b0C\u70ed\u56fa\u6027\uff08EPR\/XLPE\uff09<\/strong><\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td><strong>250\u00b0C<\/strong><\/td>\n                    <td><strong>176<\/strong><\/td>\n                    <td><strong>116<\/strong><\/td>\n                <\/tr>\n                <tr>\n                    <td>60\u00b0C EPR Rubber<br><em>60\u00b0C EPR\u6a61\u80f6<\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td>200\u00b0C<\/td>\n                    <td>159<\/td>\n                    <td>105<\/td>\n                <\/tr>\n                <tr>\n                    <td>85\u00b0C EPR Rubber<br><em>85\u00b0C EPR\u6a61\u80f6<\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td>220\u00b0C<\/td>\n                    <td>166<\/td>\n                    <td>110<\/td>\n                <\/tr>\n                <tr>\n                    <td>185\u00b0C Silicone Rubber<br><em>185\u00b0C\u7845\u6a61\u80f6<\/em><\/td>\n                    <td>30\u00b0C<\/td>\n                    <td>350\u00b0C<\/td>\n                    <td>201<\/td>\n                    <td>133<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <p>The higher the k-factor, the greater the short-circuit current a given conductor cross-section can withstand. The 250\u00b0C limit for 3GI3 EPR yields k=176 for copper, which is 23% higher than the k=143 for PVC-insulated cables limited to 160\u00b0C. This directly translates to smaller screen cross-sections for the same fault current requirement, or higher fault current capacity for the same screen size.<\/p>\n        \n        <p><em>k\u56e0\u5b50\u8d8a\u9ad8\uff0c\u7ed9\u5b9a\u5bfc\u4f53\u6a2a\u622a\u9762\u80fd\u591f\u627f\u53d7\u7684\u77ed\u8def\u7535\u6d41\u5c31\u8d8a\u5927\u30023GI3 EPR\u7684250\u00b0C\u9650\u5236\u4f7f\u94dc\u7684k=176\uff0c\u6bd4\u9650\u5236\u4e3a160\u00b0C\u7684PVC\u7edd\u7f18\u7535\u7f06\u7684k=143\u9ad823%\u3002\u8fd9\u76f4\u63a5\u8f6c\u5316\u4e3a\u76f8\u540c\u6545\u969c\u7535\u6d41\u8981\u6c42\u4e0b\u66f4\u5c0f\u7684\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\uff0c\u6216\u76f8\u540c\u5c4f\u853d\u5c42\u5c3a\u5bf8\u4e0b\u66f4\u9ad8\u7684\u6545\u969c\u7535\u6d41\u5bb9\u91cf\u3002<\/em><\/p>\n\n        <p>Source: <a href=\"https:\/\/www.electrical-installation.org\/enwiki\/Sizing_of_protective_earthing_conductor\" rel=\"nofollow noopener\" target=\"_blank\">Schneider Electric &#8211; Electrical Installation Guide: Sizing of Protective Earthing Conductor<\/a><\/p>\n    <\/section>\n\n    <section id=\"screen-sizing\">\n        <h2>6. Screen Sizing for (N)TSCGECEW\u00d6U Cables (N)TSCGECEW\u00d6U\u7535\u7f06\u7684\u5c4f\u853d\u5c42\u5c3a\u5bf8<\/h2>\n        \n        <p>The (N)TSCGECEW\u00d6U cable is a specialized medium voltage mining cable designed to DIN VDE 0250 Part 813 with enhanced flexibility and a Protective Earth Conductor consisting of individual copper wire braid for added safety. The &#8220;CE&#8221; in the designation indicates the presence of a concentrically applied copper earth (screen) conductor, and &#8220;W&#8221; denotes the copper wire braid construction.<\/p>\n        \n        <p><em>(N)TSCGECEW\u00d6U\u7535\u7f06\u662f\u6839\u636eDIN VDE 0250\u7b2c813\u90e8\u5206\u8bbe\u8ba1\u7684\u4e13\u4e1a\u4e2d\u538b\u77ff\u7528\u7535\u7f06\uff0c\u5177\u6709\u589e\u5f3a\u7684\u67d4\u97e7\u6027\u548c\u7531\u5355\u72ec\u94dc\u4e1d\u7f16\u7ec7\u7ec4\u6210\u7684\u4fdd\u62a4\u63a5\u5730\u5bfc\u4f53\uff0c\u4ee5\u589e\u52a0\u5b89\u5168\u6027\u3002\u540d\u79f0\u4e2d\u7684&#8221;CE&#8221;\u8868\u793a\u5b58\u5728\u540c\u5fc3\u6577\u8bbe\u7684\u94dc\u63a5\u5730\uff08\u5c4f\u853d\uff09\u5bfc\u4f53\uff0c&#8221;W&#8221;\u8868\u793a\u94dc\u4e1d\u7f16\u7ec7\u7ed3\u6784\u3002<\/em><\/p>\n\n        <h3>6.1 Screen Functions in Mining Cables \u77ff\u7528\u7535\u7f06\u4e2d\u5c4f\u853d\u5c42\u7684\u529f\u80fd<\/h3>\n        \n        <p>The metallic screen in (N)TSCGECEW\u00d6U cables performs multiple critical functions. It contains the electric field within the cable insulation system, provides a defined return path for capacitive charging currents, carries earth fault currents during single-phase-to-earth faults, and enables continuous ground fault monitoring for mine safety systems.<\/p>\n        \n        <p><em>(N)TSCGECEW\u00d6U\u7535\u7f06\u4e2d\u7684\u91d1\u5c5e\u5c4f\u853d\u5c42\u6267\u884c\u591a\u4e2a\u5173\u952e\u529f\u80fd\u3002\u5b83\u5c06\u7535\u573a\u9650\u5236\u5728\u7535\u7f06\u7edd\u7f18\u7cfb\u7edf\u5185\uff0c\u4e3a\u7535\u5bb9\u6027\u5145\u7535\u7535\u6d41\u63d0\u4f9b\u786e\u5b9a\u7684\u56de\u8def\uff0c\u5728\u5355\u76f8\u5bf9\u5730\u6545\u969c\u671f\u95f4\u4f20\u5bfc\u63a5\u5730\u6545\u969c\u7535\u6d41\uff0c\u5e76\u4e3a\u77ff\u5c71\u5b89\u5168\u7cfb\u7edf\u63d0\u4f9b\u8fde\u7eed\u63a5\u5730\u6545\u969c\u76d1\u6d4b\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 6: (N)TSCGECEW\u00d6U Cable Screen Specifications<\/strong><br><em>\u88686\uff1a(N)TSCGECEW\u00d6U\u7535\u7f06\u5c4f\u853d\u5c42\u89c4\u683c<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Parameter<br><em>\u53c2\u6570<\/em><\/th>\n                    <th>Specification<br><em>\u89c4\u683c<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Screen Construction<br><em>\u5c4f\u853d\u5c42\u7ed3\u6784<\/em><\/td>\n                    <td>Copper wire braid (individual wires concentrically applied)<\/td>\n                <\/tr>\n                <tr>\n                    <td>Screen Material<br><em>\u5c4f\u853d\u5c42\u6750\u6599<\/em><\/td>\n                    <td>Tinned copper wires per DIN VDE 0295<\/td>\n                <\/tr>\n                <tr>\n                    <td>Coverage<br><em>\u8986\u76d6\u7387<\/em><\/td>\n                    <td>\u226580% surface coverage<\/td>\n                <\/tr>\n                <tr>\n                    <td>Voltage Ratings<br><em>\u7535\u538b\u7b49\u7ea7<\/em><\/td>\n                    <td>3.6\/6 kV to 18\/30 kV<\/td>\n                <\/tr>\n                <tr>\n                    <td>Conductor Sizes<br><em>\u5bfc\u4f53\u5c3a\u5bf8<\/em><\/td>\n                    <td>25 mm\u00b2 to 150 mm\u00b2<\/td>\n                <\/tr>\n                <tr>\n                    <td>Insulation Type<br><em>\u7edd\u7f18\u7c7b\u578b<\/em><\/td>\n                    <td>EPR type 3GI3 per DIN VDE 0207 Part 20<\/td>\n                <\/tr>\n                <tr>\n                    <td>Short-Circuit Temperature Limit<br><em>\u77ed\u8def\u6e29\u5ea6\u9650\u5236<\/em><\/td>\n                    <td><strong>250\u00b0C<\/strong><\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>6.2 Minimum Screen Cross-Section Calculation \u6700\u5c0f\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\u8ba1\u7b97<\/h3>\n        \n        <p>The minimum screen cross-sectional area required to withstand a specified earth fault current is calculated using the adiabatic formula. Rearranging the fundamental equation gives the minimum required screen area.<\/p>\n        \n        <p><em>\u627f\u53d7\u6307\u5b9a\u63a5\u5730\u6545\u969c\u7535\u6d41\u6240\u9700\u7684\u6700\u5c0f\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\u79ef\u4f7f\u7528\u7edd\u70ed\u516c\u5f0f\u8ba1\u7b97\u3002\u91cd\u65b0\u6392\u5217\u57fa\u672c\u65b9\u7a0b\u5f97\u5230\u6240\u9700\u7684\u6700\u5c0f\u5c4f\u853d\u5c42\u9762\u79ef\u3002<\/em><\/p>\n\n        <p><strong>A<sub>min<\/sub> = (I<sub>f<\/sub> \u00d7 \u221at) \/ k<\/strong><\/p>\n\n        <p>Where: A<sub>min<\/sub> is the minimum screen cross-section (mm\u00b2), I<sub>f<\/sub> is the earth fault current (A), t is the fault clearing time (s), and k is the material factor (176 for copper with 3GI3 EPR at 250\u00b0C).<\/p>\n        \n        <p><em>\u5176\u4e2d\uff1aA<sub>min<\/sub>\u662f\u6700\u5c0f\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\uff08mm\u00b2\uff09\uff0cI<sub>f<\/sub>\u662f\u63a5\u5730\u6545\u969c\u7535\u6d41\uff08A\uff09\uff0ct\u662f\u6545\u969c\u6e05\u9664\u65f6\u95f4\uff08s\uff09\uff0ck\u662f\u6750\u6599\u56e0\u5b50\uff083GI3 EPR\u5728250\u00b0C\u65f6\u94dc\u4e3a176\uff09\u3002<\/em><\/p>\n\n        <p>Source: <a href=\"https:\/\/www.powerandcables.com\/hv-high-voltage-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">Power and Cables &#8211; HV Cable Optimization: Screen Sizing per IEC 60949<\/a><\/p>\n    <\/section>\n\n    <section id=\"practical-calculation\">\n        <h2>7. Practical Calculation Example \u5b9e\u9645\u8ba1\u7b97\u793a\u4f8b<\/h2>\n        \n        <p>Consider a (N)TSCGECEW\u00d6U 3\u00d795mm\u00b2 6\/10 kV cable installation in an underground mining application where the earth fault current is 8 kA and the protection system clearing time is 0.5 seconds.<\/p>\n        \n        <p><em>\u8003\u8651\u5728\u5730\u4e0b\u91c7\u77ff\u5e94\u7528\u4e2d\u5b89\u88c5(N)TSCGECEW\u00d6U 3\u00d795mm\u00b2 6\/10 kV\u7535\u7f06\uff0c\u63a5\u5730\u6545\u969c\u7535\u6d41\u4e3a8 kA\uff0c\u4fdd\u62a4\u7cfb\u7edf\u6e05\u9664\u65f6\u95f4\u4e3a0.5\u79d2\u3002<\/em><\/p>\n\n        <h3>7.1 Calculation with 3GI3 EPR (k=176) \u4f7f\u75283GI3 EPR\u8ba1\u7b97\uff08k=176\uff09<\/h3>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 7: Screen Sizing Calculation Example<\/strong><br><em>\u88687\uff1a\u5c4f\u853d\u5c42\u5c3a\u5bf8\u8ba1\u7b97\u793a\u4f8b<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Step<br><em>\u6b65\u9aa4<\/em><\/th>\n                    <th>Calculation<br><em>\u8ba1\u7b97<\/em><\/th>\n                    <th>Result<br><em>\u7ed3\u679c<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>1. Given Data<br><em>\u7ed9\u5b9a\u6570\u636e<\/em><\/td>\n                    <td>I<sub>f<\/sub> = 8,000 A, t = 0.5 s, k = 176<\/td>\n                    <td>\u2014<\/td>\n                <\/tr>\n                <tr>\n                    <td>2. Calculate \u221at<br><em>\u8ba1\u7b97\u221at<\/em><\/td>\n                    <td>\u221a0.5 = 0.707<\/td>\n                    <td>0.707 s<sup>0.5<\/sup><\/td>\n                <\/tr>\n                <tr>\n                    <td>3. Calculate I\u00d7\u221at<br><em>\u8ba1\u7b97I\u00d7\u221at<\/em><\/td>\n                    <td>8,000 \u00d7 0.707 = 5,656<\/td>\n                    <td>5,656 A\u00b7s<sup>0.5<\/sup><\/td>\n                <\/tr>\n                <tr>\n                    <td>4. Calculate A<sub>min<\/sub><br><em>\u8ba1\u7b97A<sub>min<\/sub><\/em><\/td>\n                    <td>5,656 \/ 176 = 32.1<\/td>\n                    <td><strong>32.1 mm\u00b2<\/strong><\/td>\n                <\/tr>\n                <tr>\n                    <td>5. Select Screen Size<br><em>\u9009\u62e9\u5c4f\u853d\u5c42\u5c3a\u5bf8<\/em><\/td>\n                    <td>Next standard size \u226532.1 mm\u00b2<\/td>\n                    <td><strong>35 mm\u00b2 copper screen<\/strong><\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>7.2 Comparison: Impact of 250\u00b0C vs 160\u00b0C Limit \u6bd4\u8f83\uff1a250\u00b0C\u4e0e160\u00b0C\u9650\u5236\u7684\u5f71\u54cd<\/h3>\n        \n        <p>To demonstrate the significance of the 250\u00b0C short-circuit temperature limit, consider the same calculation if the insulation were limited to 160\u00b0C (as with PVC), giving k=143 instead of k=176.<\/p>\n        \n        <p><em>\u4e3a\u4e86\u8bc1\u660e250\u00b0C\u77ed\u8def\u6e29\u5ea6\u9650\u5236\u7684\u91cd\u8981\u6027\uff0c\u8003\u8651\u5982\u679c\u7edd\u7f18\u9650\u5236\u4e3a160\u00b0C\uff08\u5982PVC\uff09\uff0ck=143\u800c\u4e0d\u662fk=176\u65f6\u7684\u76f8\u540c\u8ba1\u7b97\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 8: Impact of Short-Circuit Temperature on Screen Sizing<\/strong><br><em>\u88688\uff1a\u77ed\u8def\u6e29\u5ea6\u5bf9\u5c4f\u853d\u5c42\u5c3a\u5bf8\u7684\u5f71\u54cd<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Insulation System<br><em>\u7edd\u7f18\u7cfb\u7edf<\/em><\/th>\n                    <th>Max. SC Temp.<br><em>\u6700\u5927\u77ed\u8def\u6e29\u5ea6<\/em><\/th>\n                    <th>k-Factor<br><em>k\u56e0\u5b50<\/em><\/th>\n                    <th>A<sub>min<\/sub> Required<br><em>\u6240\u9700A<sub>min<\/sub><\/em><\/th>\n                    <th>Difference<br><em>\u5dee\u5f02<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td><strong>3GI3 EPR (VDE)<\/strong><\/td>\n                    <td><strong>250\u00b0C<\/strong><\/td>\n                    <td><strong>176<\/strong><\/td>\n                    <td><strong>32.1 mm\u00b2<\/strong><\/td>\n                    <td><strong>Baseline<\/strong><\/td>\n                <\/tr>\n                <tr>\n                    <td>PVC Insulation<\/td>\n                    <td>160\u00b0C<\/td>\n                    <td>143<\/td>\n                    <td>39.6 mm\u00b2<\/td>\n                    <td>+23% larger<\/td>\n                <\/tr>\n                <tr>\n                    <td>60\u00b0C EPR<\/td>\n                    <td>200\u00b0C<\/td>\n                    <td>159<\/td>\n                    <td>35.6 mm\u00b2<\/td>\n                    <td>+11% larger<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <p>The 250\u00b0C short-circuit capability of 3GI3 EPR insulation allows a 23% reduction in screen cross-sectional area compared to PVC-insulated cables. In mining cable applications where weight, flexibility, and cost are critical factors, this advantage translates directly to reduced cable weight, improved flexibility, and lower material costs.<\/p>\n        \n        <p><em>3GI3 EPR\u7edd\u7f18\u7684250\u00b0C\u77ed\u8def\u80fd\u529b\u5141\u8bb8\u4e0ePVC\u7edd\u7f18\u7535\u7f06\u76f8\u6bd4\u51cf\u5c1123%\u7684\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\u79ef\u3002\u5728\u91cd\u91cf\u3001\u67d4\u97e7\u6027\u548c\u6210\u672c\u662f\u5173\u952e\u56e0\u7d20\u7684\u77ff\u7528\u7535\u7f06\u5e94\u7528\u4e2d\uff0c\u8fd9\u4e00\u4f18\u52bf\u76f4\u63a5\u8f6c\u5316\u4e3a\u51cf\u8f7b\u7535\u7f06\u91cd\u91cf\u3001\u63d0\u9ad8\u67d4\u97e7\u6027\u548c\u964d\u4f4e\u6750\u6599\u6210\u672c\u3002<\/em><\/p>\n    <\/section>\n\n    <section id=\"design-implications\">\n        <h2>8. Design Implications for Mining Cables \u77ff\u7528\u7535\u7f06\u7684\u8bbe\u8ba1\u5f71\u54cd<\/h2>\n        \n        <p>The 250\u00b0C short-circuit temperature limit of 3GI3 EPR has several important implications for (N)TSCGECEW\u00d6U cable design and application in mining environments.<\/p>\n        \n        <p><em>3GI3 EPR\u7684250\u00b0C\u77ed\u8def\u6e29\u5ea6\u9650\u5236\u5bf9(N)TSCGECEW\u00d6U\u7535\u7f06\u5728\u91c7\u77ff\u73af\u5883\u4e2d\u7684\u8bbe\u8ba1\u548c\u5e94\u7528\u6709\u51e0\u4e2a\u91cd\u8981\u5f71\u54cd\u3002<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 9: Design Implications of 250\u00b0C Short-Circuit Rating<\/strong><br><em>\u88689\uff1a250\u00b0C\u77ed\u8def\u989d\u5b9a\u503c\u7684\u8bbe\u8ba1\u5f71\u54cd<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Aspect<br><em>\u65b9\u9762<\/em><\/th>\n                    <th>Implication<br><em>\u5f71\u54cd<\/em><\/th>\n                    <th>Benefit<br><em>\u76ca\u5904<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Screen Weight<br><em>\u5c4f\u853d\u5c42\u91cd\u91cf<\/em><\/td>\n                    <td>Smaller screen cross-section for same fault rating<\/td>\n                    <td>Reduced cable weight, improved handling<\/td>\n                <\/tr>\n                <tr>\n                    <td>Cable Flexibility<br><em>\u7535\u7f06\u67d4\u97e7\u6027<\/em><\/td>\n                    <td>Less copper in screen construction<\/td>\n                    <td>Better bending performance for reeling<\/td>\n                <\/tr>\n                <tr>\n                    <td>Material Cost<br><em>\u6750\u6599\u6210\u672c<\/em><\/td>\n                    <td>23% less copper required vs. PVC systems<\/td>\n                    <td>Lower cable procurement costs<\/td>\n                <\/tr>\n                <tr>\n                    <td>Fault Current Capacity<br><em>\u6545\u969c\u7535\u6d41\u5bb9\u91cf<\/em><\/td>\n                    <td>Higher I\u00b2t withstand for same screen size<\/td>\n                    <td>Enhanced safety margins<\/td>\n                <\/tr>\n                <tr>\n                    <td>Protection Coordination<br><em>\u4fdd\u62a4\u534f\u8c03<\/em><\/td>\n                    <td>Longer allowable fault clearing times<\/td>\n                    <td>More flexibility in protection settings<\/td>\n                <\/tr>\n                <tr>\n                    <td>Cable Diameter<br><em>\u7535\u7f06\u76f4\u5f84<\/em><\/td>\n                    <td>Potentially smaller overall cable OD<\/td>\n                    <td>Easier installation, smaller reeling drums<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>8.1 Non-Adiabatic Considerations \u975e\u7edd\u70ed\u8003\u8651\u56e0\u7d20<\/h3>\n        \n        <p>For screens and sheaths (as opposed to main conductors), IEC 60949 permits non-adiabatic calculations that account for heat dissipation from the metallic component during the fault. This can further increase the permissible short-circuit current by applying a factor \u03b5 to the adiabatic rating: I = \u03b5 \u00d7 I<sub>AD<\/sub>. For cable screens surrounded by insulation materials, this factor can provide an additional 5-15% improvement in fault current capacity, particularly for longer fault durations exceeding 1 second.<\/p>\n        \n        <p><em>\u5bf9\u4e8e\u5c4f\u853d\u5c42\u548c\u62a4\u5957\uff08\u4e0e\u4e3b\u5bfc\u4f53\u76f8\u5bf9\uff09\uff0cIEC 60949\u5141\u8bb8\u975e\u7edd\u70ed\u8ba1\u7b97\uff0c\u8003\u8651\u6545\u969c\u671f\u95f4\u91d1\u5c5e\u90e8\u4ef6\u7684\u6563\u70ed\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u5c06\u56e0\u5b50\u03b5\u5e94\u7528\u4e8e\u7edd\u70ed\u989d\u5b9a\u503c\u6765\u8fdb\u4e00\u6b65\u589e\u52a0\u5141\u8bb8\u7684\u77ed\u8def\u7535\u6d41\uff1aI = \u03b5 \u00d7 I<sub>AD<\/sub>\u3002\u5bf9\u4e8e\u88ab\u7edd\u7f18\u6750\u6599\u5305\u56f4\u7684\u7535\u7f06\u5c4f\u853d\u5c42\uff0c\u8fd9\u4e2a\u56e0\u5b50\u53ef\u4ee5\u5728\u6545\u969c\u7535\u6d41\u5bb9\u91cf\u65b9\u9762\u63d0\u4f9b\u989d\u5916\u76845-15%\u7684\u6539\u8fdb\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u8d85\u8fc71\u79d2\u7684\u8f83\u957f\u6545\u969c\u6301\u7eed\u65f6\u95f4\u3002<\/em><\/p>\n\n        <p>Source: <a href=\"https:\/\/elek.com\/articles\/short-circuit-rating-calculations-for-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">ELEK Software &#8211; Short Circuit Power Cable Sizing Explained<\/a><\/p>\n    <\/section>\n\n    <section id=\"standards-reference\">\n        <h2>9. Applicable Standards Reference \u9002\u7528\u6807\u51c6\u53c2\u8003<\/h2>\n        \n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <caption><strong>Table 10: Relevant Standards for Short-Circuit Calculations<\/strong><br><em>\u886810\uff1a\u77ed\u8def\u8ba1\u7b97\u7684\u76f8\u5173\u6807\u51c6<\/em><\/caption>\n            <thead>\n                <tr>\n                    <th>Standard<br><em>\u6807\u51c6<\/em><\/th>\n                    <th>Title<br><em>\u6807\u9898<\/em><\/th>\n                    <th>Application<br><em>\u5e94\u7528<\/em><\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>IEC 60949<\/td>\n                    <td>Calculation of thermally permissible short-circuit currents<\/td>\n                    <td>Adiabatic and non-adiabatic methods<\/td>\n                <\/tr>\n                <tr>\n                    <td>IEC 60364-5-54<\/td>\n                    <td>Earthing arrangements and protective conductors<\/td>\n                    <td>K-factor tables, PE sizing<\/td>\n                <\/tr>\n                <tr>\n                    <td>DIN VDE 0207-20<\/td>\n                    <td>Rubber compounds for insulation (3GI3)<\/td>\n                    <td>EPR insulation specifications<\/td>\n                <\/tr>\n                <tr>\n                    <td>DIN VDE 0250-813<\/td>\n                    <td>Medium voltage reeling cables for mining<\/td>\n                    <td>(N)TSCGECEW\u00d6U cable construction<\/td>\n                <\/tr>\n                <tr>\n                    <td>IEC 60228<\/td>\n                    <td>Conductors of insulated cables<\/td>\n                    <td>Conductor classes and dimensions<\/td>\n                <\/tr>\n                <tr>\n                    <td>DIN VDE 0295<\/td>\n                    <td>Conductors for cables and cords<\/td>\n                    <td>German implementation of IEC 60228<\/td>\n                <\/tr>\n                <tr>\n                    <td>DIN EN 60811-404<\/td>\n                    <td>Oil resistance tests for cable materials<\/td>\n                    <td>Sheath material qualification<\/td>\n                <\/tr>\n                <tr>\n                    <td>IEC 60724<\/td>\n                    <td>Short-circuit temperature limits of cables<\/td>\n                    <td>Maximum temperature guidance<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n    <\/section>\n\n    <section id=\"conclusion\">\n        <h2>10. Conclusion \u7ed3\u8bba<\/h2>\n        \n        <p>The 250\u00b0C short-circuit temperature limit for 3GI3 EPR-insulated VDE cables is established based on the thermosetting nature of the EPR compound and its ability to maintain dielectric integrity during brief thermal excursions. This limit, significantly higher than the 160\u00b0C limit for thermoplastic PVC, enables the use of smaller copper screen cross-sections in (N)TSCGECEW\u00d6U mining cables while maintaining adequate earth fault current capacity.<\/p>\n        \n        <p><em>3GI3 EPR\u7edd\u7f18VDE\u7535\u7f06\u7684250\u00b0C\u77ed\u8def\u6e29\u5ea6\u9650\u5236\u662f\u57fa\u4e8eEPR\u5316\u5408\u7269\u7684\u70ed\u56fa\u6027\u7279\u6027\u53ca\u5176\u5728\u77ed\u6682\u70ed\u6ce2\u52a8\u671f\u95f4\u4fdd\u6301\u4ecb\u7535\u5b8c\u6574\u6027\u7684\u80fd\u529b\u800c\u786e\u5b9a\u7684\u3002\u8fd9\u4e2a\u9650\u5236\u660e\u663e\u9ad8\u4e8e\u70ed\u5851\u6027PVC\u7684160\u00b0C\u9650\u5236\uff0c\u4f7f\u5f97(N)TSCGECEW\u00d6U\u77ff\u7528\u7535\u7f06\u80fd\u591f\u4f7f\u7528\u66f4\u5c0f\u7684\u94dc\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\uff0c\u540c\u65f6\u4fdd\u6301\u8db3\u591f\u7684\u63a5\u5730\u6545\u969c\u7535\u6d41\u5bb9\u91cf\u3002<\/em><\/p>\n\n        <p>The practical significance is substantial: the higher k-factor (176 vs 143) translates to approximately 23% reduction in required screen cross-section for the same fault current and clearing time. For mining operations where cable weight, flexibility, and cost are critical factors, the 3GI3 EPR insulation system offers clear advantages over alternative insulation materials with lower short-circuit temperature ratings.<\/p>\n        \n        <p><em>\u5b9e\u9645\u610f\u4e49\u662f\u91cd\u5927\u7684\uff1a\u66f4\u9ad8\u7684k\u56e0\u5b50\uff08176\u5bf9143\uff09\u610f\u5473\u7740\u5728\u76f8\u540c\u7684\u6545\u969c\u7535\u6d41\u548c\u6e05\u9664\u65f6\u95f4\u4e0b\uff0c\u6240\u9700\u7684\u5c4f\u853d\u5c42\u6a2a\u622a\u9762\u51cf\u5c11\u7ea623%\u3002\u5bf9\u4e8e\u7535\u7f06\u91cd\u91cf\u3001\u67d4\u97e7\u6027\u548c\u6210\u672c\u662f\u5173\u952e\u56e0\u7d20\u7684\u91c7\u77ff\u4f5c\u4e1a\uff0c3GI3 EPR\u7edd\u7f18\u7cfb\u7edf\u6bd4\u5177\u6709\u8f83\u4f4e\u77ed\u8def\u6e29\u5ea6\u989d\u5b9a\u503c\u7684\u66ff\u4ee3\u7edd\u7f18\u6750\u6599\u5177\u6709\u660e\u663e\u4f18\u52bf\u3002<\/em><\/p>\n\n        <p>Engineers specifying (N)TSCGECEW\u00d6U cables should ensure that screen sizing calculations properly account for the 250\u00b0C short-circuit limit, using k=176 for copper screens, and should coordinate with protection system designers to verify that fault clearing times are within the cable&#8217;s thermal withstand capability.<\/p>\n        \n        <p><em>\u6307\u5b9a(N)TSCGECEW\u00d6U\u7535\u7f06\u7684\u5de5\u7a0b\u5e08\u5e94\u786e\u4fdd\u5c4f\u853d\u5c42\u5c3a\u5bf8\u8ba1\u7b97\u6b63\u786e\u8003\u8651250\u00b0C\u77ed\u8def\u9650\u5236\uff0c\u5bf9\u94dc\u5c4f\u853d\u5c42\u4f7f\u7528k=176\uff0c\u5e76\u5e94\u4e0e\u4fdd\u62a4\u7cfb\u7edf\u8bbe\u8ba1\u4eba\u5458\u534f\u8c03\u4ee5\u9a8c\u8bc1\u6545\u969c\u6e05\u9664\u65f6\u95f4\u5728\u7535\u7f06\u7684\u70ed\u8010\u53d7\u80fd\u529b\u8303\u56f4\u5185\u3002<\/em><\/p>\n    <\/section>\n\n    <section id=\"contact\">\n        <h2>11. Contact Information \u8054\u7cfb\u65b9\u5f0f<\/h2>\n        \n        <p><strong>Anhui Feichun Special Cable Co., Ltd.<\/strong><br>\n        <em>\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8<\/em><\/p>\n\n        <table border=\"1\" cellpadding=\"8\" cellspacing=\"0\" width=\"100%\">\n            <tbody>\n                <tr>\n                    <td><strong>Technical Inquiries<br><em>\u6280\u672f\u54a8\u8be2<\/em><\/strong><\/td>\n                    <td><a href=\"mailto:tech@feichuncables.com\">tech@feichuncables.com<\/a><\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>Sales (Zihao Yang)<br><em>\u9500\u552e\uff08\u6768\u5b50\u8c6a\uff09<\/em><\/strong><\/td>\n                    <td><a href=\"mailto:zihao.yang@feichuncables.com\">zihao.yang@feichuncables.com<\/a><\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>Sales (Ziyu Huang)<br><em>\u9500\u552e\uff08\u9ec4\u5b50\u715c\uff09<\/em><\/strong><\/td>\n                    <td><a href=\"mailto:ziyu.huang@feichuncables.com\">ziyu.huang@feichuncables.com<\/a><\/td>\n                <\/tr>\n                <tr>\n                    <td><strong>WhatsApp<\/strong><\/td>\n                    <td><a href=\"https:\/\/wa.me\/8613855123218\" rel=\"nofollow noopener\" target=\"_blank\">+86 138 5512 3218<\/a><\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <p>Our engineering team provides technical support for short-circuit calculations, screen sizing verification, and custom cable design for mining, tunnelling, and heavy industrial applications.<\/p>\n        \n        <p><em>\u6211\u4eec\u7684\u5de5\u7a0b\u56e2\u961f\u4e3a\u91c7\u77ff\u3001\u96a7\u9053\u548c\u91cd\u5de5\u4e1a\u5e94\u7528\u63d0\u4f9b\u77ed\u8def\u8ba1\u7b97\u3001\u5c4f\u853d\u5c42\u5c3a\u5bf8\u9a8c\u8bc1\u548c\u5b9a\u5236\u7535\u7f06\u8bbe\u8ba1\u7684\u6280\u672f\u652f\u6301\u3002<\/em><\/p>\n    <\/section>\n\n    <footer>\n        <hr>\n        <h3>References \u53c2\u8003\u6587\u732e<\/h3>\n        <ol>\n            <li><a href=\"https:\/\/www.prysmian.com\/sites\/default\/files\/business_markets\/markets\/downloads\/datasheets\/Medium-Voltage-Round.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Prysmian PROTOLON Medium Voltage Reeling Cable Datasheet<\/a><\/li>\n            <li><a href=\"https:\/\/www.elandcables.com\/cables\/n-tscgecewou-cables-en\" rel=\"nofollow noopener\" target=\"_blank\">Eland Cables &#8211; (N)TSCGECEW\u00d6U Cable Technical Data<\/a><\/li>\n            <li><a href=\"https:\/\/standards.globalspec.com\/std\/1160909\/iec-60949\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60949 &#8211; Thermally Permissible Short-Circuit Currents<\/a><\/li>\n            <li><a href=\"https:\/\/www.electrical-installation.org\/enwiki\/Sizing_of_protective_earthing_conductor\" rel=\"nofollow noopener\" target=\"_blank\">Schneider Electric &#8211; Sizing of Protective Earthing Conductor<\/a><\/li>\n            <li><a href=\"https:\/\/wiki.openelectrical.org\/index.php?title=Adiabatic_Short_Circuit_Temperature_Rise\" rel=\"nofollow noopener\" target=\"_blank\">Open Electrical &#8211; Adiabatic Short Circuit Temperature Rise<\/a><\/li>\n            <li><a href=\"https:\/\/uk.prysmian.com\/sites\/uk.prysmian.com\/files\/media\/documents\/Cable%20Short%20Circuit%20Ratings%20(1).pdf\" rel=\"nofollow noopener\" target=\"_blank\">Prysmian UK &#8211; Cable Short Circuit Ratings<\/a><\/li>\n            <li><a href=\"https:\/\/elek.com\/articles\/short-circuit-rating-calculations-for-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">ELEK Software &#8211; Short Circuit Power Cable Sizing Explained<\/a><\/li>\n            <li><a href=\"https:\/\/m.zmscable.com\/new\/What-is-the-difference-between-EPR-and-FR-XLPE-cables\" rel=\"nofollow noopener\" target=\"_blank\">ZMS Cable &#8211; EPR vs FR-XLPE Comparison<\/a><\/li>\n            <li><a href=\"https:\/\/www.centralwires.com\/epr-vs-xlpe\/\" rel=\"nofollow noopener\" target=\"_blank\">Central Wires &#8211; EPR vs XLPE for Cable Insulation<\/a><\/li>\n            <li><a href=\"https:\/\/www.powerandcables.com\/hv-high-voltage-cables\/\" rel=\"nofollow noopener\" target=\"_blank\">Power and Cables &#8211; HV Cable Screen Sizing Optimization<\/a><\/li>\n        <\/ol>\n        \n        <p><em>This technical analysis was prepared by Anhui Feichun Special Cable Co., Ltd. (\u5b89\u5fbd\u98de\u7eaf\u7279\u79cd\u7535\u7f06\u6709\u9650\u516c\u53f8). For assistance with short-circuit calculations and cable selection, please contact our engineering team.<\/em><\/p>\n    <\/footer>\n\n<\/article>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"In the design of medium voltage mining and reeling cables such as the (N)TSCGECEW\u00d6U, the short-circuit temperature rating of the insulation material fundamentally determines the cable&#8217;s fault current withstand capability. The 3GI3 EPR (Ethylene Propylene Rubber) compound specified in DIN VDE 0207 Part 20 has a maximum permissible short-circuit temperature of 250\u00b0C, which directly influences how engineers must size the metallic screen to safely conduct earth fault currents without thermal damage.\n\u5728\u8bbe\u8ba1\u8bf8\u5982(N)TSCGECEW\u00d6U\u7b49\u4e2d\u538b\u77ff\u7528\u548c\u5377\u7b52\u7535\u7f06\u65f6\uff0c\u7edd\u7f18\u6750\u6599\u7684\u77ed\u8def\u6e29\u5ea6\u989d\u5b9a\u503c\u4ece\u6839\u672c\u4e0a\u51b3\u5b9a\u4e86\u7535\u7f06\u7684\u6545\u969c\u7535\u6d41\u627f\u53d7\u80fd\u529b\u3002DIN VDE 0207\u7b2c20\u90e8\u5206\u89c4\u5b9a\u76843GI3 EPR\uff08\u4e59\u4e19\u6a61\u80f6\uff09\u5316\u5408\u7269\u7684\u6700\u5927\u5141\u8bb8\u77ed\u8def\u6e29\u5ea6\u4e3a250\u00b0C\uff0c\u8fd9\u76f4\u63a5\u5f71\u54cd\u5de5\u7a0b\u5e08\u5fc5\u987b\u5982\u4f55\u786e\u5b9a\u91d1\u5c5e\u5c4f\u853d\u5c42\u7684\u5c3a\u5bf8\uff0c\u4ee5\u5b89\u5168\u4f20\u5bfc\u63a5\u5730\u6545\u969c\u7535\u6d41\u800c\u4e0d\u4f1a\u9020\u6210\u70ed\u635f\u574f\u3002","protected":false},"author":1,"featured_media":4953,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"left","csco_page_header_type":"title","csco_page_load_nextpost":"","footnotes":""},"categories":[66,464,9563,1,56,101],"tags":[17,25801,33053,40,5584,5583,33060,5582,779,33050,5581,5580,33064,3305,33067,32434,1114,4622,33044,1079,4231,4225,33041,145,6960,1757,1238,33046,33069,778,33047,10039,33056,33052,149,828,111,5674,1683,5680,33040,25552,1082,33065,1067,801,33042,3186,33066,33068,1232,227,4985,994,228,1091,33043,32965,33045,22791,33061,33055,33062,33049,33057,33063,33058,33059,33048,11984,33051,33054],"class_list":["post-4952","post","type-post","status-publish","format-standard","has-post-thumbnail","category-common-problems-encountered-in-cable-applications","category-flexible-cables-with-high-bending-life-and-fatigue-resistance","category-medium-voltage-cable","category-uncategorized","category-reeling-cable","category-submersible-pump-cable","tag-reeling-cable","tag-ntscgecewou-cable-3","tag-ntscgecewou","tag-ntscgewou","tag-12-20kv-cable","tag-18-30kv-cable","tag-250c","tag-3-6-6kv-cable","tag-3gi3-epr-insulation","tag-3gi3-epr","tag-6-10kv-cable","tag-8-7-15kv-cable","tag-cable-design-mining","tag-cable-selection-guide","tag-cable-thermal-analysis","tag-capacitive-charging-current","tag-continuous-miner-cable","tag-copper-braid-screen-cable","tag-cross-linked-rubber-insulation","tag-dragline-cable","tag-earth-conductor-cable","tag-earth-fault-protection","tag-epr-cable-insulation","tag-epr-insulation","tag-epr-mining-cable","tag-ethylene-propylene-rubber","tag-excavator-cable","tag-fault-clearing-time","tag-fault-current-withstand-design","tag-flexible-mining-cable","tag-ground-fault-current","tag-high-temperature-insulation","tag-iec-60949","tag-k","tag-medium-voltage-cable","tag-medium-voltage-mining-cable","tag-mining-cable","tag-mining-cable-specification","tag-mobile-mining-equipment-cable","tag-mv-mining-cable","tag-n-tscgecewou-2","tag-ntscgecewou-3","tag-opencast-mining-cable","tag-protection-coordination-cable","tag-quarry-cable","tag-reeling-drum-cable","tag-rubber-insulation-cable","tag-rubber-sheathed-cable","tag-screen-sizing-engineering","tag-short-circuit-calculation-method","tag-shuttle-car-cable","tag-tbm-cable","tag-thermosetting-insulation","tag-trailing-cable","tag-tunnel-boring-machine-cable","tag-underground-mining-cable","tag-vde-0207-20-insulation","tag-vde-0250","tag-xlpe-vs-epr","tag-22791","tag-33061","tag-33055","tag-33062","tag-33049","tag-33057","tag-33063","tag-33058","tag-33059","tag-33048","tag-11984","tag-33051","tag-33054","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4952","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/comments?post=4952"}],"version-history":[{"count":1,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4952\/revisions"}],"predecessor-version":[{"id":4954,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/4952\/revisions\/4954"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media\/4953"}],"wp:attachment":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media?parent=4952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/categories?post=4952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/tags?post=4952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}