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OVERVOLTAGES AT VACUUM SWITCHING DEVICES OPERATION

机译：真空开关设备工作时过大

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摘要

The paper presents the results of experimental investigations on overvoltages in the 10 kV and 6 kV networks at switching-in and switching-out of 10 kV/0.4 kV and 6 kV/0.4 kV transformers and 6 kV motors with vacuum switching devices. A large number of investigations had been performed, particularly in the self-consumption distributing networks of thermal power plants. In addition, the comparative investigations of overvoltages at vacuum and minimum oil circuit-breakers operation in the same network configurations, were carried out. Switchings-in and switchings-out by means of vacuum circuit-breakers give rise to the considerable overvoltages. At switching-in, preliminary ignitions of the electric arc occur. The overvoltages with high steepnesses enter the power transformer windings and stator windings of high-voltage motors and significantly stress their interturn insulation. At switching-out, the phenomenon of current chopping before its passage through natural zero value takes place. High overvoltages appear, which stress the insulation to earth of power transformer windings and stator windings of high-voltage motors. On the basis of the elaborated analysis of overvoltage phenomena, the measures and means for reduction and limitation of overvoltges at vacuum switching devices operation are suggested.
机译：本文介绍了在10 kV和6 kV网络中接入和断开10 kV / 0.4 kV和6 kV / 0.4 kV变压器以及带有真空开关装置的6 kV电动机时过电压的实验研究结果。已经进行了大量研究，尤其是在火力发电厂的自耗配电网络中。此外，还对相同网络配置下的真空过压和最小油断路器的运行进行了比较研究。通过真空断路器的接通和断开会产生相当大的过电压。在接通时，发生电弧的初步点火。高陡度的过电压会进入高压电机的电源变压器绕组和定子绕组，并严重影响其匝间绝缘。在断开时，会发生电流斩波现象，直到其通过自然零值。出现高的过电压，这会给高压电机的电源变压器绕组和定子绕组提供对地绝缘的应力。在对过电压现象进行详尽分析的基础上，提出了减少和限制真空开关装置工作时过电压的措施和手段。

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