Type 455 Cables (3.3kV – 33kV): Technical Advantages of Interstitial Earth Conductor Design

455型电缆（3.3kV – 33kV）：间隙式接地导体设计的技术优势分析

Anhui Feichun Special Cable Co., Ltd. | 安徽飞纯特种电缆有限公司

Introduction 引言

In medium and high-voltage mining cable engineering, the positioning of earth (grounding) conductors represents a critical design decision that significantly impacts cable performance, operational efficiency, and overall system reliability. Type 455 cables, manufactured in accordance with AS/NZS 2802:2000, feature a distinctive design where earth conductors are located in the interstices rather than as a concentric layer surrounding the power cores.[1][2]

在中高压矿用电缆工程中，接地导体的定位是一项关键的设计决策，对电缆性能、运行效率和系统整体可靠性产生重大影响。符合AS/NZS 2802:2000标准制造的455型电缆采用独特的设计，将接地导体置于间隙中，而非作为环绕电力芯线的同心层。

This technical analysis examines why the interstitial earth conductor configuration provides superior performance characteristics for reeling and trailing applications, particularly in stacker-reclaimer operations, draglines, and other mobile mining equipment operating in the 3.3kV to 33kV voltage range.

本技术分析探讨了为何间隙式接地导体配置能为卷绕和拖曳应用提供更优越的性能特性，特别是在堆取料机、拉铲及其他在3.3kV至33kV电压范围内运行的移动采矿设备中的应用。

Type 455 Cable Construction 455型电缆结构

Type 455 cables are specifically designed with reduced insulation and sheath thickness, eliminating the cradle separator whilst incorporating two earth conductors and one pilot core positioned in the outer interstices. This configuration represents a fundamental departure from conventional mining cable construction philosophy.[1][3]

455型电缆专门设计为减小绝缘层和护套厚度，取消托架分隔器，同时在外部间隙中设置两根接地导体和一根引导芯线。这一配置代表了与传统矿用电缆结构理念的根本性转变。

Key Structural Components 主要结构组件

Conductor 导体
Flexible stranded tinned annealed copper
柔性绞合镀锡退火铜
Conductor Screen 导体屏蔽
Semiconductive compound (≥3.3kV)
半导电化合物（≥3.3kV时）
Insulation 绝缘层
EPR (Ethylene Propylene Rubber)
乙丙橡胶（EPR）
Insulation Screen 绝缘屏蔽
Semiconductive elastomer
半导电弹性体
Earth Conductors 接地导体
2× CSP-covered interstitial conductors
2根CSP包覆间隙式导体
Pilot Core 引导芯线
1× EPR-covered interstitial conductor
1根EPR包覆间隙式导体
Outer Sheath 外护套
Heavy Duty CSP (HD-CSP)
重型氯磺化聚乙烯（HD-CSP）
Operating Temperature 工作温度
-25°C to +90°C
-25°C 至 +90°C

Interstitial vs Concentric Earth Conductor Design 间隙式与同心式接地导体设计对比

The fundamental difference between these two approaches lies in the spatial positioning of the earth conductors within the cable cross-section and its consequent effects on overall cable geometry and performance.[4][5]

这两种方法的根本区别在于接地导体在电缆横截面内的空间定位及其对电缆整体几何形状和性能的影响。

Comparison: Interstitial vs Concentric Earth Conductor Configuration
对比：间隙式与同心式接地导体配置
Parameter 参数 Interstitial Design (Type 455) 间隙式设计 Concentric Layer Design 同心层设计
Earth Conductor Position
接地导体位置		 Located in interstices between power cores
位于电力芯线之间的间隙中		 Helically wound layer around insulated cores
环绕绝缘芯线的螺旋缠绕层
Cable Diameter
电缆直径		 Reduced (utilises existing space)
减小（利用现有空间）		 Increased (additional radial layer)
增大（额外径向层）
Cable Mass
电缆质量		 Lower kg/m
较低 kg/m		 Higher kg/m
较高 kg/m
Flexibility
柔韧性		 Enhanced for reeling operations
卷绕操作增强		 Standard
标准
Drum Capacity
卷筒容量		 Increased cable length per drum
每卷筒电缆长度增加		 Standard capacity
标准容量
Typical Application
典型应用		 Stacker-reclaimers, slow reeling
堆取料机、慢速卷绕		 General mining, fixed installations
通用采矿、固定安装

Technical Advantages of Interstitial Earth Conductor Design 间隙式接地导体设计的技术优势

01
Reduced Overall Diameter 减小整体直径
By utilising the naturally occurring spaces (interstices) between the three power cores, the earth and pilot conductors occupy volume that would otherwise be filled with filler material. This eliminates the need for an additional concentric layer, resulting in a diameter reduction of approximately 10-15%.[1][6]

通过利用三根电力芯线之间自然产生的空间（间隙），接地和引导导体占据了原本会被填充材料填满的体积。这消除了对额外同心层的需求，使直径减少约10-15%。

02
Significant Mass Reduction 显著减轻质量
The elimination of both cradle separators and the external concentric earth layer substantially reduces cable weight per metre. This weight reduction translates directly to decreased dynamic loads on reeling mechanisms, lower motor power requirements for drum operation, and reduced structural stress on support systems.[6]

取消托架分隔器和外部同心接地层可大幅降低每米电缆重量。这种减重直接转化为卷绕机构动态负载降低、卷筒操作电机功率需求降低以及支撑系统结构应力减小。

03
Enhanced Drum Capacity 增加卷筒容量
Cable drum capacity increases proportionally as diameter decreases. Industry analysis indicates that a 15% reduction in diameter translates to approximately 30% additional cable length on standard reels, potentially eliminating the need for oversized drum assemblies in applications requiring 500-800 metres of travel distance.[6]

电缆卷筒容量随直径减小而按比例增加。行业分析表明，直径减少15%可使标准卷筒上的电缆长度增加约30%，在需要500-800米行程距离的应用中可能无需使用超大型卷筒组件。

04
Improved Flexibility 提高柔韧性
The absence of a rigid concentric conductor layer allows the cable to flex more readily during reeling and trailing operations. This characteristic is particularly valuable in stacker-reclaimer applications where cables must navigate complex three-dimensional paths whilst under tension.[1][3]

没有刚性同心导体层使电缆在卷绕和拖曳操作中更容易弯曲。这一特性在堆取料机应用中尤为重要，因为电缆在张力下必须通过复杂的三维路径。

05
Reduced Rotational Inertia 降低转动惯量
Lower cable mass results in reduced rotational inertia on cable drums, enabling faster acceleration and deceleration of reeling mechanisms. Operational analysis demonstrates 8-12% faster travel speeds achievable with reduced-diameter cables, translating to 5-7% higher overall system throughput.[6]

较低的电缆质量导致卷筒转动惯量降低，使卷绕机构能够更快地加速和减速。运行分析表明，采用缩小直径的电缆可实现8-12%的更快行进速度，转化为整体系统吞吐量提高5-7%。

06
Simplified Installation 简化安装
The uniform sizing of earth and pilot conductors in Type 455 cables simplifies installation procedures. Technicians do not need to identify specific cores during termination, and consistent electrical characteristics are maintained throughout the protective grounding system.[6]

455型电缆中接地和引导导体的统一尺寸简化了安装程序。技术人员在端接时无需识别特定芯线，并且在整个保护接地系统中保持一致的电气特性。

Technical Note 技术说明: The dual earth conductor configuration (2× interstitial earth conductors) provides redundant grounding pathways, meeting the requirements of AS/NZS 2802:2000 for mining cable earth fault detection systems whilst maintaining the benefits of reduced diameter and mass.[2][7]

双接地导体配置（2根间隙式接地导体）提供冗余接地通路，满足AS/NZS 2802:2000对矿用电缆接地故障检测系统的要求，同时保持直径和质量减小的优势。

Technical Specifications 技术规格

Type 455 Cable Electrical and Physical Parameters (Representative Values)
455型电缆电气和物理参数（代表值）
Voltage Rating
额定电压		 Conductor Area
导体面积		 Insulation Thickness
绝缘厚度		 Nominal Diameter
标称直径		 Approx. Mass
近似质量
3.3/3.3 kV 25 mm² 2.2 mm 45.9 mm 320 kg/100m
3.3/3.3 kV 50 mm² 2.4 mm 54.4 mm 470 kg/100m
6.6/6.6 kV 70 mm² 3.0 mm 62.6 mm 640 kg/100m
11/11 kV 95 mm² 5.0 mm 74.8 mm 870 kg/100m
22/22 kV 120 mm² 7.6 mm 91.7 mm 1,245 kg/100m
33/33 kV 150 mm² 10.5 mm 95.8 mm 1,415 kg/100m

注：以上数值基于AS/NZS 2802:2000标准，实际值可能因制造商和具体配置而异。更多规格请联系安徽飞纯特种电缆有限公司获取详细技术数据表。

Diameter Reduction Calculation Example 直径减小计算示例

For a 6.6kV, 70mm² conductor cable comparing Type 455 (interstitial) vs Type 450 (concentric screen with cradle):

Type 450 Nominal Diameter: ~65-68 mm (with composite screen)
Type 455 Nominal Diameter: ~62.6 mm (interstitial design)
Diameter Reduction: ≈ 5-8%
Drum Capacity Increase: ≈ 10-16% (theoretical)

对于6.6kV、70mm²导体电缆，比较455型（间隙式）与450型（带托架的同心屏蔽）：直径减少约5-8%，卷筒容量理论上增加约10-16%。

Primary Applications 主要应用

Type 455 cables with interstitial earth conductors are specifically engineered for applications where minimised diameter and mass provide operational advantages:[1][3][6]

采用间隙式接地导体的455型电缆专为最小化直径和质量能提供运行优势的应用而设计：

Application Suitability Matrix 应用适用性矩阵
Application 应用 Typical Voltage 典型电压 Key Requirement 关键要求 Type 455 Suitability 455型适用性
Stacker-Reclaimers
堆取料机		 6.6kV – 33kV Minimal diameter, slow reeling
最小直径、慢速卷绕		 Excellent 优秀
Ship Loaders
装船机		 6.6kV – 22kV Weight reduction, drum capacity
减重、卷筒容量		 Excellent 优秀
Container Cranes
集装箱起重机		 3.3kV – 11kV Flexibility, repeated cycling
柔韧性、反复循环		 Very Good 非常好
Bucket Wheel Excavators
斗轮挖掘机		 11kV – 33kV Long travel distance, mass reduction
长行程距离、质量减小		 Excellent 优秀
Draglines
拉铲		 6.6kV – 22kV Trailing flexibility
拖曳柔韧性		 Good 良好
Coal Terminal Equipment
煤炭码头设备		 6.6kV – 11kV Harsh environment, reliability
恶劣环境、可靠性		 Excellent 优秀

Standards Compliance 标准合规性

Type 455 cables are manufactured in full compliance with the following Australian and international standards:[2][7][8]

455型电缆完全符合以下澳大利亚和国际标准的要求：

Primary Standard 主要标准
AS/NZS 2802:2000
Cable Classification 电缆分类
Class 1 (Reduced radial dimensions)
Voltage Range 电压范围
3.3/3.3 kV to 33/33 kV
Application Scope 应用范围
Surface mining, general industrial reeling/trailing
Important 重要提示: Type 455 cables manufactured to AS/NZS 2802:2000 are certified for hard rock mining and surface operations. They are NOT approved for underground coal mining operations, which require AS/NZS 1802:2018 certified cables due to different explosion protection requirements.[7][8]

按AS/NZS 2802:2000制造的455型电缆已获得硬岩采矿和地面作业认证。由于防爆要求不同，这些电缆未获准用于地下煤矿作业，地下煤矿需要使用AS/NZS 1802:2018认证的电缆。

Conclusion 结论

The interstitial earth conductor design in Type 455 cables represents an optimised engineering solution for applications demanding minimal cable diameter and reduced weight whilst maintaining comprehensive electrical protection and safety compliance. By positioning earth conductors in the naturally occurring spaces between power cores rather than as an additional concentric layer, manufacturers achieve significant benefits in terms of diameter reduction, mass reduction, enhanced drum capacity, improved flexibility, and operational efficiency.

455型电缆中的间隙式接地导体设计代表了针对需要最小电缆直径和减轻重量同时保持全面电气保护和安全合规性的应用的优化工程解决方案。通过将接地导体定位在电力芯线之间自然产生的空间中，而非作为额外的同心层，制造商在直径减小、质量减轻、卷筒容量增加、柔韧性提高和运行效率方面实现了显著优势。

For stacker-reclaimer applications, ship loaders, and other mobile material handling equipment where cable weight directly impacts operational performance, the Type 455 design with interstitial earth conductors provides measurable advantages over traditional concentric layer configurations.

对于堆取料机、装船机和其他电缆重量直接影响运行性能的移动物料搬运设备，采用间隙式接地导体的455型设计比传统同心层配置提供了可衡量的优势。

References and Technical Sources 参考文献和技术来源

  1. [1] Caledonian Cables. “Mining Cable (AS/NZS Standard) – Type 455 3.3 to 33KV.” Technical Datasheet. https://www.caledonian-cables.com/product/mining-cables/Type_455_3.3_to_33KV.html
  2. [2] Standards New Zealand. “AS/NZS 2802:2000 – Electric cables – Reeling and trailing – For mining and general use (other than underground coal mining).” https://www.standards.govt.nz/
  3. [3] Eland Cables. “Type 450 and Type 455 Flexible Rubber Mining Cables.” Technical Specification. https://www.elandcables.com/cables/type-450-and-type-455-flexible-rubber-mining-cables
  4. [4] ZW Cable. “Concentric Cables: What Are They?” Technical Guide. https://www.centralwires.com/concentric-cables-what-are-they/
  5. [5] Calmont Wire & Cable. “Conductor Stranding.” Technical Reference. https://www.calmont.com/resources/conductor-stranding/
  6. [6] Feichun Port and Maritime Cables. “Type 455 3.3 to 33KV Reeling & Trailing Cable: Engineering Excellence for Stacker Reclaimer Applications.” https://www.cranecable.com.au/
  7. [7] Tratos Group. “AS/NZS 2802 – Standard for Mining Cables.” https://tratosgroup.com/products/standards/others/as-nzs-2802/
  8. [8] Prysmian Group Australia. “Cable Guide for the Mining Industry.” Technical Publication, November 2018. https://australia.prysmian.com/

Contact Anhui Feichun Special Cable Co., Ltd. 联系安徽飞纯特种电缆有限公司

For technical enquiries, quotations, or customised cable specifications, please contact our engineering team:

如需技术咨询、报价或定制电缆规格，请联系我们的工程团队：

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Anhui Feichun Special Cable Co., Ltd. | 安徽飞纯特种电缆有限公司

Specialising in mining cables, reeling cables, trailing cables, and industrial power cables for demanding applications.

专业生产矿用电缆、卷筒电缆、拖曳电缆及工业电力电缆，适用于各种严苛应用环境。

© 2025 Anhui Feichun Special Cable Co., Ltd. All technical information provided is for reference purposes. Specifications subject to change without notice.