Study on the Technology of Leakage Protection

摘要

Failure leakage of equipment or electric shock may make the residual current amplitude decrease, whichcauses effective protection of the fault and the existence of dead zone of operation. This paper presents the principle of residualcurrent leakage protection based on vector, using residual current amplitude and residual current variation of faultleakage protection, the realization of mutation leakage, continuous slow change leakage detection and recognition, triangleformulas residual current variation calculation method, orthogonal decomposition calculation method and three-phaseequivalent calculation method. Through the analysis of the residual current vector variation, we put forward the correspondingmethod of delayed electrical leakage protection. According to the residual current amplitude, mutation leakage,slowly varying leakage, electric leakage comprehensive protection, we can reduce the leakage protection action area; improvethe reliability of power system.