基于电压偏置的配电网单相接地过电压保护研究

Research on Single-Phase Grounding Overvoltage Protection of Power Distribution Network Based on the Voltage Bias

摘要: 针对工矿企业中压配电网单相接地故障时，弧光过电压对电力设备绝缘的威胁，改变了接地补偿的传统观念，提出一种利用电压偏置原理灭弧的有源调压型消弧限压保护方式。首先，分析了中压配电网小电流接地系统弧光过电压产生的机理，提出全电流补偿的必要性；其次，通过介绍有源调压型消弧限压保护的原理，分析了方法的可行性；最后，设计出有源调压型消弧限压保护的电气方案，从理论上论证了方法的正确性。

Abstract: In view of the threat of arc-over voltage to power equipment insulation when the single phase grounding fault in the medium voltage distribution network of industrial and mining enterprises, an active pressure regulating arc suppression limiting voltage protection method using voltage bias theory is presented in this paper. And the traditional concept of ground compensation has been changed. Firstly, the mechanism of arc overvoltage in low current grounding system of me-dium voltage distribution network is analyzed, and the necessity of full current compensation is put forward. Secondly, the principle of active pressure regulating arc suppression and pressure limiting protection is introduced, and the feasibility of the method is analyzed. Finally, an active pressure-regulating arc-suppressing protection scheme is designed, and the correctness of the method is proved in theory.