Semi-conductive screens are critical components in high voltage cable construction, serving as the interface between the cable insulation and metallic shielding systems. These screens, typically made of carbon-loaded cross-linked semi-conductive compounds approximately 1mm thick, provide a smooth transition that ensures homogeneous electric field distribution throughout the cable system. 半导电屏蔽层是高压电缆结构中的关键组成部分，作为电缆绝缘层和金属屏蔽系统之间的界面，确保整个电缆系统中均匀的电场分布。

The removal of semi-conductive screens during cable jointing or termination procedures represents the single most critical factor controlling the service life of cable accessories. According to industry best practices, improper screen removal can lead to premature failure of joints and terminations, making the selection between easy-strip and bonded screen technologies a fundamental decision in cable system design. 在电缆接头或端接过程中半导电屏蔽层的去除是控制电缆附件使用寿命的最关键因素。

Type 455 cables fall under the ICEA S-108-720 standard classification for extruded insulation power cables rated above 46 kV through 500 kV AC. These cables are designed for high voltage transmission applications and feature either crosslinked polyethylene (XLPE) or ethylene propylene rubber (EPR) insulation systems. Type 455电缆属于ICEA S-108-720标准分类，适用于额定电压46千伏至500千伏交流的挤出绝缘电力电缆。

The standard construction for Type 455 HV cables includes a stranded conductor with conductor screen, extruded XLPE or EPR insulation, semi-conductive insulation screen, metallic shielding (typically aluminum or copper), and an outer protective jacket. The choice between easy-strip and bonded semi-conductive screens significantly impacts both installation procedures and long-term system reliability. Type 455高压电缆的标准结构包括绞合导体、导体屏蔽层、挤出XLPE或EPR绝缘、半导电绝缘屏蔽层、金属屏蔽和外保护护套。

For Easy-Strip Systems / 易剥离系统

When working with easy-strip semi-conductive screens, the cable jointer must precisely mark the screen termination point using a white chinagraph pencil and create a clean circumferential score at the designated cutback location. The screen material should be peeled away carefully following the score mark to ensure a square, perpendicular cut without tearing or leaving residual material on the insulation surface. 使用易剥离型半导电屏蔽层时，电缆接头工必须使用白色标记笔精确标记屏蔽层终止点，并在指定的切口位置创建清晰的环形刻痕。

After removal, all black semi-conductive particles must be removed from the XLPE insulation surface using approved cable cleaning wipes, wiping from the cable end toward the screen termination point to prevent contamination. Any remaining particles can cause surface tracking and eventual flashover failure. Fine grade aluminum oxide paper may be used for stubborn residue, but emery paper must be avoided due to metallic particle content that could compromise electrical integrity. 去除后，必须使用经批准的电缆清洁布从XLPE绝缘表面去除所有黑色半导电颗粒，从电缆末端向屏蔽层终止点擦拭以防止污染。

For Bonded Systems / 粘结型系统

Bonded semi-conductive screen removal demands precision-engineered cable jointing tools that consistently remove the screen layer without nicking, damaging, or cutting into the cable insulation. The Ripley US02-7000 and Alroc CWB/18-60 tools are industry-standard equipment designed specifically for this purpose, featuring adjustable blade depths in increments of 0.1mm and the ability to create a chamfered transition at the screen cutback. 粘结型半导电屏蔽层的去除需要精密工程化的电缆接头工具，能够一致性地去除屏蔽层而不会划伤、损坏或切入电缆绝缘。

The cable jointer must establish the correct blade depth setting, typically 1.0mm for standard applications, and maintain consistent rotational pressure while advancing the tool along the cable. The shaved semi-conductive strip should be wound around the tool handle during operation to prevent it from catching under cable rollers, which would disturb the shaving result and potentially damage the insulation surface. 电缆接头工必须建立正确的刀片深度设置，标准应用通常为1.0mm，并在沿电缆推进工具时保持一致的旋转压力。

Upon completion, the insulation surface must exhibit a smooth finish with a properly chamfered transition where the semi-conducting screen terminates. No score marks, scratches, or damage should be visible, and there must be no loss of bond at the screen termination point. Third-party partial discharge testing with sensitivity better than 5pC is increasingly becoming the quality assurance standard for critical HV installations. 完成后，绝缘表面必须呈现光滑的表面，在半导电屏蔽层终止处具有适当的倒角过渡。

Industry professionals have observed a notable shift in semi-conductive screen technology preferences over the past decades. According to experienced utility engineers, many organizations initially adopted easy-strip screens to reduce installation time and minimize workmanship issues at medium voltage levels. However, as bonded screen stripping tool technology has advanced, particularly with the introduction of precision instruments that eliminate the need for lubrication and provide chamfered cutbacks, there has been movement toward bonded screens even at lower voltage classes. 行业专业人士观察到过去几十年中半导电屏蔽层技术偏好的显著转变。

Ben Lanz, Director of Applications Engineering at IMCORP USA with expert technical oversight of power cable life cycle consulting for systems ranging from 5kV to 500kV, emphasizes that the semi-conductive screen cutback represents the most critical point in cable termination procedures. The industry consensus supports the position that a smooth transition with proper chamfering produces superior electrical stress field control compared to sharp perpendicular cuts. Ben Lanz，IMCORP美国公司应用工程总监，在5kV至500kV系统的电力电缆生命周期咨询方面具有专业技术监督，强调半导电屏蔽层切口是电缆端接程序中最关键的点。

For voltage classes of 69kV and above, bonded insulation shields are generally specified as industry standard. The rationale centers on the critical nature of these transmission systems, where the consequences of cable failure extend beyond financial costs to encompass significant reputational damage and grid reliability impacts. The additional installation complexity and skilled labor requirements are justified by the enhanced quality control and reduced failure modes associated with properly executed bonded screen removal. 对于69千伏及以上的电压等级，粘结绝缘屏蔽层通常被指定为行业标准。

For technical consultations on Type 455 HV cable specifications, semi-conductive screen selection, or custom cable solutions for your transmission and distribution projects, our engineering team is available to assist. 如需Type 455高压电缆规格、半导电屏蔽层选择或输配电项目定制电缆解决方案的技术咨询，我们的工程团队随时为您提供帮助。