Electric device leakage protection device based on equipotential detection

Abstract

The invention discloses an electric device leakage protection device based on equipotential detection. The electric device leakage protection device based on the equipotential detection comprises a sensor portion, a data acquisition processing circuit and an executing mechanism. The data acquisition processing circuit comprises a signal processing circuit and a processor circuit portion. The sensor portion is used for acquiring a leakage voltage signal of an electric device, and the signal processing circuit is used for receiving the leakage voltage signal and preprocessing the leakage voltage signal. The processor circuit portion is used for analyzing and calculating the preprocessed leakage voltage signal, comparing a calculation result with a set value and controlling the executing mechanism. The electric device leakage protection device is different from other protection devices based on a leakage current protection principle, is a leakage protection device designed based on an equipotential detection principle, can achieve data acquisition in a wide dynamic range, has good insulating performance and accordingly is suitable for leakage protection of electric devices in various occasions.

Description

technical field [0001] The invention belongs to the field of leakage detection, in particular to a leakage protection device for electrical equipment based on equipotential detection. Background technique [0002] In recent years, although people attach great importance to the safe use of electricity, especially the prevention of electric leakage accidents, accidents such as electric shock casualties and electric leakage fires have occurred from time to time. The current leakage protection methods and their shortcomings are as follows: [0003] ①Protective grounding: In the three-phase four-wire system where the neutral point is directly grounded, the electrical equipment is grounded through the grounding resistance. If the selected grounding resistance is too large, the low-voltage circuit breaker or fuse cannot be disconnected by the ground fault current, and the equipment shell will be charged for a long time, and the charged power can cause casualties. If the grounding ...

AI Technical Summary

Problems solved by technology

However, due to the quality problems of the residual current circuit breaker itself and the unreasonable design of technical parameters, it will cause the malfunction or refusal of the residual current circuit breaker. At the same time, the overvoltage of the line system will also cause the malfunction of the residual current circuit breaker.

Images