Abstract

Transients in a high- and medium-voltage power-supply network due to switching operations and short circuits are accompanied by high-frequency overvoltage pulses. Their amplitude and frequency characteristics are needed to select proper protection devices. Only experimental study can give us reliable data on such characteristics. The paper presents overvoltage spikes experimental study data in switchgears of 6–500 kV. The spikes were measured by means of recorder with noncontact capacitive sensors. Experimental studies at power-engineering facilities showed that most hazardous phenomena are high-frequency resonances. In this case, the overvoltage values are over ten times higher than nominal voltage amplitude. The usual method of connecting protection device to mains via a conductor a few meters long was shown to be inadequate to provide equipment protection. RC circuits are needed for this situation.

中文翻译：

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高频过电压尖峰的实验研究

摘要

由于开关操作和短路，高压和中压电源网络中的瞬变伴随着高频过压脉冲。选择合适的保护装置需要它们的幅度和频率特性。只有实验研究才能为我们提供有关这些特性的可靠数据。本文介绍了 6-500 kV 开关设备中的过电压尖峰实验研究数据。通过具有非接触式电容传感器的记录器测量尖峰。电力工程设施的实验研究表明，最危险的现象是高频共振。在这种情况下，过电压值比标称电压幅度高十倍以上。这种情况需要RC电路。