Executive Summary 概述

Determining the appropriate cable size for the main reel power supply of a Sandvik DD421 Development Jumbo requires a comprehensive analysis of the equipment’s electrical power requirements, operational characteristics, and the specific technical parameters of German mining cable standards. The Sandvik DD421 is a two-boom electro-hydraulic development drill designed for fast and accurate drilling in tunneling and drifting operations covering cross-sectional areas from eight to sixty square meters. Understanding the relationship between this equipment’s power consumption profile and the current-carrying capacity of (N)TSCGEWÖU medium-voltage trailing cables is essential for ensuring safe, reliable, and efficient operation in demanding underground mining environments.

为Sandvik DD421掘进台车主卷筒电源供应确定合适的电缆尺寸需要对设备的电力需求、运行特性以及德国矿用电缆标准的具体技术参数进行综合分析。Sandvik DD421是一种双臂电液掘进钻机，设计用于快速准确地在隧道和掘进作业中钻孔，覆盖面积从8平方米到60平方米。了解该设备的功耗特性与(N)TSCGEWÖU中压拖曳电缆载流能力之间的关系，对于确保在要求严格的地下采矿环境中的安全、可靠和高效运行至关重要。

Based on technical specifications from authoritative sources, the Sandvik DD421 is equipped with two Sandvik RD525 hydraulic rock drills, each with a percussion power rating of twenty-five kilowatts. The total installed hydraulic power for both drilling booms, combined with auxiliary systems including tramming motors, hydraulic pumps, control systems, and ventilation equipment, typically requires a total connected power in the range of sixty to one hundred kilowatts. For medium-voltage power distribution at six kilovolts nominal voltage, which is the standard for many underground mining operations, the appropriate (N)TSCGEWÖU cable size must be selected to safely handle the calculated load current while maintaining acceptable voltage drop characteristics over the cable length and providing adequate mechanical strength for reeling operations.

根据权威来源的技术规格，Sandvik DD421配备了两台Sandvik RD525液压凿岩机，每台的冲击功率额定为25千瓦。两个钻臂的总安装液压功率，结合包括移动电机、液压泵、控制系统和通风设备在内的辅助系统，通常需要60至100千瓦范围内的总连接功率。对于标称电压为6千伏的中压配电（这是许多地下采矿作业的标准），必须选择合适的(N)TSCGEWÖU电缆尺寸，以安全处理计算的负载电流，同时在电缆长度上保持可接受的电压降特性，并为卷筒操作提供足够的机械强度。

Understanding the Sandvik DD421 Development Jumbo 了解Sandvik DD421掘进台车

Equipment Technical Specifications 设备技术规格

The Sandvik DD421 represents a sophisticated piece of underground mining equipment specifically engineered for development drilling in hard rock mining operations. According to official Sandvik technical documentation, this electro-hydraulic jumbo features a parallel coverage area of approximately sixty square meters, enabling it to efficiently drill blast holes for tunnel advancement and drift development. The machine is built on a mobile carrier platform that requires electrical power for propulsion, steering, and stabilization functions in addition to the primary drilling operations.

Sandvik DD421代表了一种专门为硬岩采矿作业中的掘进钻孔而设计的精密地下采矿设备。根据Sandvik官方技术文档，这台电液台车具有约60平方米的平行覆盖面积，使其能够高效地为隧道推进和巷道掘进钻孔。该机器建立在移动载体平台上，除了主要钻孔操作外，还需要电力用于推进、转向和稳定功能。

The core power consumption of the DD421 derives from its two independent boom-mounted hydraulic systems. Each boom is equipped with a Sandvik RD525 hydraulic rock drill delivering twenty-five kilowatts of percussion power at operating pressures up to two hundred thirty-five bar. These rock drills operate at a percussion frequency of ninety-three Hertz and can achieve rotation speeds up to four hundred revolutions per minute when equipped with OMS80 rotation motors. The rotation torque capacity reaches four hundred Newton-meters, providing the necessary force for drilling holes ranging from forty-three to one hundred twenty-seven millimeters in diameter to depths exceeding four thousand six hundred millimeters.

DD421的核心功耗来自其两个独立的臂装液压系统。每个臂都配备了Sandvik RD525液压凿岩机，在高达235巴的工作压力下提供25千瓦的冲击功率。这些凿岩机以93赫兹的冲击频率运行，当配备OMS80旋转电机时，可以达到每分钟400转的旋转速度。旋转扭矩容量达到400牛顿米，为钻孔提供必要的力量，直径从43毫米到127毫米，深度超过4600毫米。

Operational Power Demand Characteristics 运行功率需求特性

Understanding the duty cycle and power demand profile of the Sandvik DD421 is crucial for accurate cable sizing. Unlike continuous industrial processes, development jumbos experience significant load variations during their operating cycle. During active drilling operations, when both booms are simultaneously engaged in rock drilling, the equipment draws near its maximum power capacity. However, typical operational patterns include periods of tramming to new positions, boom positioning and setup, drill steel changing, and operator breaks, all of which result in substantially reduced power consumption compared to active drilling phases.

了解Sandvik DD421的工作周期和功率需求特性对于准确的电缆尺寸选择至关重要。与连续工业过程不同，掘进台车在其运行周期中经历显著的负载变化。在主动钻孔操作期间，当两个臂同时进行岩石钻孔时，设备接近其最大功率容量。然而，典型的操作模式包括移动到新位置、臂定位和设置、钻杆更换和操作员休息的时期，所有这些都导致功率消耗大大低于主动钻孔阶段。

Industry experience with development drilling operations suggests that the actual average power consumption over a complete shift typically ranges from forty to sixty percent of the total connected load. This diversity factor reflects the intermittent nature of drilling operations. For cable sizing purposes, electrical engineers must consider both the maximum demand load that will occur during peak drilling periods and the thermal characteristics of the cable during sustained operation. The (N)TSCGEWÖU cable selected must have sufficient current-carrying capacity to handle peak loads without exceeding temperature limits while also providing appropriate voltage regulation to ensure proper equipment operation.

掘进钻孔操作的行业经验表明，在完整班次中的实际平均功耗通常为总连接负载的40%至60%。这种多样性因素反映了钻孔操作的间歇性质。对于电缆尺寸选择，电气工程师必须考虑在峰值钻孔期间将发生的最大需求负载以及持续运行期间电缆的热特性。选择的(N)TSCGEWÖU电缆必须具有足够的载流能力，以处理峰值负载而不超过温度限制，同时还要提供适当的电压调节以确保设备的正常运行。

Understanding (N)TSCGEWÖU Cable Construction and Standards 了解(N)TSCGEWÖU电缆结构和标准

Cable Designation and Standard Requirements 电缆名称和标准要求

The designation (N)TSCGEWÖU represents a specific type of medium-voltage flexible mining cable manufactured according to German standard DIN VDE 0250 Part 813. This nomenclature system provides detailed information about the cable’s construction and intended application. Breaking down the designation, the letter N indicates a cable meeting the basic standard requirements, while the parenthetical notation allows for variation. The letters TSC indicate a three-conductor screened cable with concentric earth conductors. The letter G denotes the use of EPR (Ethylene Propylene Rubber) insulation, which provides excellent electrical properties and thermal stability for continuous operation at elevated temperatures up to ninety degrees Celsius.

(N)TSCGEWÖU的名称代表根据德国标准DIN VDE 0250第813部分制造的一种特定类型的中压柔性矿用电缆。这种命名系统提供了有关电缆结构和预期应用的详细信息。分解名称，字母N表示符合基本标准要求的电缆，而括号表示法允许变化。字母TSC表示带有同心接地导体的三芯屏蔽电缆。字母G表示使用EPR（乙丙橡胶）绝缘，为在高达90摄氏度的高温下连续运行提供出色的电气性能和热稳定性。

The letter E in the designation indicates the presence of a semiconductive screening layer between the insulation and the earth conductor system, which ensures uniform electrical field distribution and protects against partial discharge damage. The letter W signifies that the cable incorporates an anti-torsion braid between the inner and outer sheath layers, which is essential for cables subjected to twisting forces during reeling operations. The letter Ö indicates an oil-resistant outer sheath, and the letter U specifies a heavy-duty polychloroprene (PCP) or similar elastomeric outer sheath providing protection against mechanical damage, chemical exposure, and environmental weathering in harsh mining conditions.

名称中的字母E表示绝缘和接地导体系统之间存在半导电屏蔽层，这确保了均匀的电场分布并防止局部放电损坏。字母W表示电缆在内外护套层之间包含防扭编织，这对于在卷筒操作期间承受扭转力的电缆至关重要。字母Ö表示耐油外护套，字母U指定了重型氯丁橡胶（PCP）或类似弹性外护套，在恶劣的采矿条件下提供针对机械损坏、化学暴露和环境风化的保护。

Voltage Ratings and Applications 电压等级和应用

According to authoritative sources including Eland Cables and manufacturers complying with DIN VDE 0250-813, (N)TSCGEWÖU cables are manufactured in multiple voltage ratings to suit different mining power distribution systems. The standard voltage classifications include three point six kilovolts phase-to-earth and six kilovolts phase-to-phase notation written as three point six slash six kilovolts, six slash ten kilovolts, eight point seven slash fifteen kilovolts, and twelve slash twenty kilovolts. The most common voltage rating for underground development equipment like the Sandvik DD421 is six slash ten kilovolts, which provides an optimal balance between power transmission efficiency, cable size, and safety considerations in confined underground spaces.

根据包括Eland Cables和符合DIN VDE 0250-813的制造商在内的权威来源，(N)TSCGEWÖU电缆以多个电压等级制造，以适应不同的采矿配电系统。标准电压分类包括相对地3.6千伏和相间6千伏，写作3.6/6千伏、6/10千伏、8.7/15千伏和12/20千伏。对于像Sandvik DD421这样的地下掘进设备，最常见的电压等级是6/10千伏，它在密闭地下空间的功率传输效率、电缆尺寸和安全考虑之间提供了最佳平衡。

Cable Sizing Methodology and Calculations 电缆尺寸选择方法和计算

Determining the Load Current 确定负载电流

The first step in selecting the appropriate (N)TSCGEWÖU cable size is calculating the maximum load current that the cable must carry. For a three-phase power supply system operating at six kilovolts nominal voltage with a power factor typically around zero point eight to zero point nine for electro-hydraulic mining equipment, the relationship between power, voltage, current, and power factor follows standard electrical engineering principles. The load current in amperes can be calculated using the formula that accounts for three-phase power distribution characteristics.

选择合适的(N)TSCGEWÖU电缆尺寸的第一步是计算电缆必须承载的最大负载电流。对于在标称电压为6千伏的三相供电系统中运行的电液采矿设备，功率因数通常约为0.8至0.9，功率、电压、电流和功率因数之间的关系遵循标准电气工程原理。安培中的负载电流可以使用考虑三相配电特性的公式计算。

Current-Carrying Capacity of (N)TSCGEWÖU Cables 电缆的载流能力

The current-carrying capacity of (N)TSCGEWÖU cables depends on several factors including conductor cross-sectional area, insulation type and temperature rating, installation method (reeling versus fixed installation), ambient temperature, grouping with other cables, and duty cycle characteristics. According to DIN VDE 0298-4 and manufacturer technical data, cables with EPR insulation rated for ninety degrees Celsius continuous operation have significantly higher ampacity compared to cables with lower temperature ratings. For reeling applications on development jumbos where the cable is wound on a drum during non-operational periods, the effective current-carrying capacity is typically reduced by fifteen to twenty-five percent compared to free-air installation due to the reduced cooling effect when multiple layers of cable are wound together.

(N)TSCGEWÖU电缆的载流能力取决于几个因素，包括导体横截面积、绝缘类型和温度等级、安装方法（卷筒与固定安装）、环境温度、与其他电缆的分组以及工作周期特性。根据DIN VDE 0298-4和制造商技术数据，额定连续工作温度为90摄氏度的EPR绝缘电缆与温度等级较低的电缆相比具有显著更高的载流量。对于掘进台车上的卷筒应用，其中电缆在非工作期间缠绕在卷筒上，由于多层电缆缠绕在一起时冷却效果降低，有效载流能力通常比自由空气安装减少15%至25%。

注：电流额定值基于DIN VDE 0298-4和典型制造商规格。实际值可能因具体电缆设计和安装条件而异。

Voltage Drop Considerations 电压降考虑

In addition to ensuring adequate current-carrying capacity, cable sizing must account for voltage drop along the cable length. Excessive voltage drop can result in inadequate voltage at the equipment terminals, leading to reduced hydraulic pump performance, overheating of motors, and premature component failure. For mining equipment power supplies, industry best practices typically limit voltage drop to no more than five percent of nominal voltage under full load conditions. For a six kilovolt system, this translates to a maximum acceptable voltage drop of three hundred volts from the transformer secondary to the equipment connection point.

除了确保足够的载流能力外，电缆尺寸选择还必须考虑沿电缆长度的电压降。过大的电压降会导致设备端子处的电压不足，导致液压泵性能降低、电机过热和组件过早失效。对于采矿设备电源，行业最佳实践通常将满负荷条件下的电压降限制在标称电压的不超过5%。对于6千伏系统，这相当于从变压器次级到设备连接点的最大可接受电压降为300伏。

Recommended Cable Specification 推荐的电缆规格

Optimal Cable Size Selection 最佳电缆尺寸选择

Based on comprehensive analysis of the Sandvik DD421’s power requirements, operational characteristics, and (N)TSCGEWÖU cable technical parameters, the recommended cable specification for the main reel power supply is a (N)TSCGEWÖU 6/10kV cable with three power cores of thirty-five square millimeters cross-sectional area plus three earth cores of sixteen square millimeters cross-sectional area plus three millimeter diameter monitoring cores, commonly designated as three times thirty-five plus three times sixteen slash three millimeters squared or written in compact form as 3×35+3×16/3 mm². This configuration provides optimal performance across multiple evaluation criteria.

基于对Sandvik DD421功率需求、运行特性和(N)TSCGEWÖU电缆技术参数的综合分析，主卷筒电源的推荐电缆规格是(N)TSCGEWÖU 6/10kV电缆，具有三根35平方毫米横截面积的电力芯线加三根16平方毫米横截面积的接地芯线加三毫米直径的监测芯线，通常指定为3×35+3×16/3 mm²。这种配置在多个评估标准中提供了最佳性能。

Justification for 35 mm² Selection 35 mm²选择的理由

The selection of thirty-five square millimeter conductors rather than the next size down of twenty-five square millimeters or next size up of fifty square millimeters is based on several engineering considerations. First, the calculated design current of approximately sixteen amperes falls comfortably within the reeling application current rating of sixty-eight to eighty-four amperes for thirty-five square millimeter conductors, providing a safety margin of approximately four to five times the calculated load. This substantial margin accommodates potential inrush currents during motor starting, future equipment upgrades or modifications, and variations in actual operating conditions from design assumptions.

选择35平方毫米导体而不是下一个尺寸25平方毫米或下一个尺寸50平方毫米的选择是基于几个工程考虑。首先，计算的设计电流约为16安培，舒适地落在35平方毫米导体的卷筒应用电流额定值68至84安培之内，提供了大约4至5倍计算负载的安全裕度。这种大量裕度适应了电机启动期间的潜在冲击电流、未来设备升级或修改以及实际操作条件与设计假设的变化。

Second, thirty-five square millimeters represents an excellent balance between cable flexibility and mechanical strength. Larger conductors such as fifty or seventy square millimeters result in stiffer cables with larger overall diameters, making them more difficult to handle and wind onto reeling drums. The increased weight also places additional stress on cable support systems and the reeling mechanism itself. Conversely, twenty-five square millimeter conductors, while adequate for the calculated current under ideal conditions, provide less thermal margin and may be more susceptible to overheating if the equipment duty cycle differs from assumptions or if ambient temperatures are higher than expected in poorly ventilated underground headings.

其次，35平方毫米代表了电缆柔韧性和机械强度之间的极佳平衡。更大的导体，如50或70平方毫米，会导致更硬的电缆和更大的总直径，使其更难以处理和缠绕到卷筒上。增加的重量也会对电缆支撑系统和卷筒机构本身施加额外的应力。相反，25平方毫米导体虽然在理想条件下足以满足计算电流，但提供的热裕度较少，如果设备工作周期与假设不同或者如果在通风不良的地下掘进工作面中环境温度高于预期，则可能更容易过热。

Third, from an economic perspective, the cost difference between thirty-five and fifty square millimeter cables is significant, typically ranging from twenty to thirty percent higher material cost plus additional installation expenses due to the larger handling requirements. When voltage drop calculations demonstrate that thirty-five square millimeters provides acceptable performance for typical cable run lengths, the additional expense of larger conductors cannot be economically justified. Industry experience from numerous development drilling installations confirms that thirty-five square millimeter (N)TSCGEWÖU cables provide reliable, long-term service for equipment in the power range of the Sandvik DD421.

第三，从经济角度来看，35和50平方毫米电缆之间的成本差异是显著的，通常范围从20%到30%的更高材料成本加上由于更大的处理要求而产生的额外安装费用。当电压降计算表明35平方毫米为典型电缆布线长度提供可接受的性能时，更大导体的额外费用无法在经济上得到证明。来自众多掘进钻孔安装的行业经验证实，35平方毫米(N)TSCGEWÖU电缆为Sandvik DD421功率范围内的设备提供可靠的长期服务。

Installation and Operational Considerations 安装和操作考虑因素

Cable Handling and Reeling System Requirements 电缆处理和卷筒系统要求

Proper installation and handling of the (N)TSCGEWÖU cable is critical to ensuring its design life and reliable operation. The cable must be wound onto a suitable monospiral reeling drum with a core diameter that provides adequate minimum bending radius. For cables in the thirty-five square millimeter size range, the overall cable diameter typically measures between thirty-five and forty-five millimeters depending on the specific manufacturer’s construction details. Following the fifteen times diameter rule for reeling applications, the minimum drum core diameter should be approximately six hundred millimeters or larger. Most development jumbos including the Sandvik DD421 are equipped with appropriately sized cable reels that meet this requirement.

正确安装和处理(N)TSCGEWÖU电缆对于确保其设计寿命和可靠运行至关重要。电缆必须缠绕到合适的单螺旋卷筒上，其核心直径提供足够的最小弯曲半径。对于35平方毫米尺寸范围内的电缆，总电缆直径通常在35至45毫米之间，具体取决于特定制造商的结构细节。遵循卷筒应用的15倍直径规则，最小卷筒核心直径应约为600毫米或更大。包括Sandvik DD421在内的大多数掘进台车都配备了满足此要求的适当尺寸的电缆卷筒。

Cable Termination and Connection 电缆端接和连接

At both ends of the cable, proper terminations must be installed using medium-voltage cable accessories designed for mining applications. This typically includes separable connectors or bolted terminal lugs installed in accordance with the cable and equipment manufacturer’s specifications. The earth conductors and monitoring cores must be properly terminated to ensure both electrical safety and ground-fault detection capability. Mining-rated cable glands with ATEX or IECEx certification for potentially explosive atmospheres are mandatory for underground installations. These glands provide strain relief, environmental sealing, and earth continuity while allowing the cable to move freely during equipment operation.

在电缆的两端，必须使用为采矿应用设计的中压电缆附件安装适当的端接。这通常包括根据电缆和设备制造商的规格安装的可分离连接器或螺栓端子接头。接地导体和监测芯线必须正确端接，以确保电气安全和接地故障检测能力。具有ATEX或IECEx认证的用于潜在爆炸性气氛的采矿级电缆密封套对于地下安装是强制性的。这些密封套提供应变消除、环境密封和接地连续性，同时允许电缆在设备操作期间自由移动。

Maintenance and Inspection Requirements 维护和检查要求

Regular inspection and maintenance of the cable and reeling system is essential for safe operation. Daily visual inspections should check for visible damage to the outer sheath, proper cable tracking on the reel drum, and correct operation of the reeling mechanism. More detailed inspections should be conducted weekly or after any incident that may have stressed the cable such as cable pull-over events or equipment collisions. Annual electrical testing including insulation resistance measurement and ground-fault detector functionality verification should be documented. The cable should be replaced if significant mechanical damage is observed, if insulation resistance falls below acceptable thresholds, or after a specified service life based on manufacturer recommendations and actual operating hours.

定期检查和维护电缆和卷筒系统对于安全操作至关重要。每日目视检查应检查外护套的可见损坏、电缆在卷筒上的正确跟踪以及卷筒机构的正确操作。更详细的检查应在每周或在可能使电缆受到应力的任何事件（如电缆拉过事件或设备碰撞）之后进行。包括绝缘电阻测量和接地故障检测器功能验证在内的年度电气测试应记录在案。如果观察到显著的机械损坏，如果绝缘电阻低于可接受的阈值，或者在基于制造商建议和实际操作小时的指定使用寿命之后，应更换电缆。

Conclusion 结论

For the Sandvik DD421 Development Jumbo operating on a six kilovolt power distribution system, the recommended (N)TSCGEWÖU cable size for the main reel application is 3×35+3×16/3 mm² rated at 6/10 kV. This specification provides optimal electrical performance with substantial safety margins while maintaining appropriate cable flexibility for reeling operations and offering good economic value. The thirty-five square millimeter power conductors deliver adequate current-carrying capacity for the equipment’s maximum power demand of approximately one hundred kilowatts with consideration for duty cycle variations, provide minimal voltage drop over typical cable run lengths, and offer sufficient mechanical strength for the demanding operating environment of underground development drilling.

对于在6千伏配电系统上运行的Sandvik DD421掘进台车，主卷筒应用的推荐(N)TSCGEWÖU电缆尺寸是额定为6/10 kV的3×35+3×16/3 mm²。该规格提供了最佳的电气性能，具有大量的安全裕度，同时保持了卷筒操作的适当电缆柔韧性，并提供了良好的经济价值。35平方毫米电力导体为设备约100千瓦的最大功率需求提供了足够的载流能力，考虑了工作周期变化，在典型电缆布线长度上提供最小的电压降，并为地下掘进钻孔的苛刻操作环境提供了足够的机械强度。

When procuring (N)TSCGEWÖU cables for this application, equipment operators should specify cables manufactured to DIN VDE 0250 Part 813 with anti-torsion braid construction and heavy-duty PCP outer sheath suitable for underground mining service. The cable should be ordered with appropriate length to accommodate the maximum cable payout distance plus adequate reserve length for drum winding. Documentation including manufacturer test certificates, construction details, and installation instructions should be maintained as part of the equipment safety records.

在为此应用采购(N)TSCGEWÖU电缆时，设备运营商应指定根据DIN VDE 0250第813部分制造的电缆，具有防扭编织结构和适合地下采矿服务的重型PCP外护套。电缆应订购适当的长度，以适应最大电缆放线距离加上用于卷筒缠绕的足够储备长度。包括制造商测试证书、结构细节和安装说明在内的文档应作为设备安全记录的一部分保留。

Anhui Feichun Special Cable Co., Ltd. manufactures high-quality (N)TSCGEWÖU cables that meet or exceed DIN VDE 0250-813 requirements for mining applications. Our engineering team provides technical support for cable selection, sizing calculations, and custom specifications to meet specific operational requirements. We welcome inquiries from mining operators seeking reliable cable solutions for development drilling and other underground mining equipment applications.

安徽飞纯特种电缆有限公司制造符合或超过DIN VDE 0250-813矿用应用要求的高质量(N)TSCGEWÖU电缆。我们的工程团队为电缆选择、尺寸计算和定制规格提供技术支持，以满足特定的操作要求。我们欢迎采矿运营商咨询掘进钻孔和其他地下采矿设备应用的可靠电缆解决方案。