多回路电缆金属护套环流计算软件的开发与应用

摘要

Nowadays urban power grid has more and more 35kV class and above cable lines.Single-core cables are always used in 35kV class and above cable lines. The single-core metal sheaths will get induction voltage when the alternating current through the wire of the single-core cables. Grounding-protection for metal sheaths is the measure to reduce the voltage which will form an intergrated circuit. The excessive current in the sheaths will increase the econmic cost and expedite the insulation aging. The software which can calculate the current in the sheaths is written by the MATLAB and LabVIEW software. By using the software some advises can be given for the current suppression and cable placing in the future.%目前城市电网中35kV以上电压等级的电缆线路越来越多。35kV以上电压等级线路往往使用单芯电缆。单芯电力电缆线芯通过交变电流时，金属护套上会产生感应电势。为了防止感应电压过大对人体造成伤害，需要将金属护套两端牢固接地。当电缆金属护套两端接地时金属护套中会有环流通过。护套环流过大时会严重影响电缆的安全运行（红色部分不适合防在中，建议精简）。本文通过MATLAB及LabVIEW软件编程方法实现了一至四回路任意排列电缆线路护套环流的计算，提出了抑制环流措施和电缆优化敷设方式，为未来电缆敷设提供科学指导意见。