In the digital era, the secondary equipment of power system is becoming more and more sensitive to electromagnetic interference. Gas insulated switchgear (GIS) in substations will generate very fast transient overvoltage (VFTO) after switching action. The VFTO will generate transient electromagnetic fields and cause interferences to the secondary side cables. In recent years, the anti-interference measures for cable protection have been greatly improved. However, in the current cable trenches of some substations, there are still many irregular cable arrangements. It may have some influences on the electromagnetic interference to the cable generated by VFTO. This paper expresses a method for finding the exact interference areas of the cable and standardizing the wiring standard of the cable. Firstly, the relationship between the cable position variation and parameters is analyzed. Then, simulation experiments based on speculation are conducted to observe the effect of irregular cable arrangement on port voltage, and computer software simulation is performed for comparison. After that, an irregular cable is simulated and an interval type Ⅱ fuzzy neural network is used to predict the parameters of the shielding layer of the cable at each irregularly arranged point. Finally, the voltage and current at each point of the cable shield are calculated through the finite-difference time-domain (FDTD) algorithm. In this manner, the actual position of the higher interference voltage can be determined, which can provide a reference standard for cable arrangement.

中文翻译：

---

VFTO对二次侧电缆不规则分布的干扰研究


数字时代，电力系统二次设备对电磁干扰越来越敏感。变电站中的气体绝缘开关设备（GIS）在开关动作后会产生非常快的瞬态过电压（VFTO）。 VFTO会产生瞬态电磁场，对二次侧电缆造成干扰。近年来，电缆保护的抗干扰措施有了很大的提高。但目前一些变电站的电缆沟中，仍存在不少不规则的电缆布置情况。它可能会对VFTO产生的对电缆的电磁干扰产生一定的影响。本文提出了一种寻找电缆精确干扰区域、规范电缆布线标准的方法。首先，分析了电缆位置变化与参数之间的关系。然后，进行基于推测的仿真实验，观察不规则电缆布置对端口电压的影响，并进行计算机软件仿真进行比较。然后对不规则电缆进行仿真，利用区间Ⅱ型模糊神经网络对电缆各不规则排列点处的屏蔽层参数进行预测。最后，通过时域有限差分（FDTD）算法计算电缆屏蔽层各点的电压和电流。这样就可以确定较高干扰电压的实际位置，为电缆布置提供参考标准。