Residual current load relay

Abstract

The invention provides a residual current load relay. The residual current load relay comprises a central processing unit, a magnetic latching drive unit, a three-phase current sampling unit, a residual current sampling unit, a communication unit and an input setting unit, the magnetic latching drive unit comprises a magnetic latching relay and a magnetic latching relaycontrol circuit, the three-phase current sampling unit comprises a current transformer, a current sampling circuit, a current filtering circuit and a current amplifying circuit, the current amplifying circuit is connected with the central processing unit, the residual current sampling unit comprises a zero sequence transformer, an electric leakage sampling circuit, an electric leakage sorting circuit, an electric leakage filtering circuit and an electric leakage amplifying circuit, and the communication unit is provided with an electricity meter feedback receiving circuit. The residual current load relay has functions ofoverload protection, short circuit protection, and electric leakage protection, at the same time further has the functions of automatic reclosing lock, communication networking, electricity meter feedback control, and rated current adjustment, and the intelligence degree of the residual current load relay is high.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a residual current load relay. Background technique [0002] At present, in the entire power protection system, most of the end user power protection devices are small circuit breakers. The protection functions of the miniature circuit breaker include overload protection, short circuit protection and leakage protection, but because the miniature circuit breaker does not have the function of automatic reclosing, it needs manual power transmission after a power failure occurs, which increases the operating procedures and labor costs, which is not in line with modern The trend of intelligence will reduce the market share; secondly, the miniature circuit breaker does not have the function of communication networking and cannot monitor the user's electricity consumption in real time, so it is very difficult to locate the fault point of the power consumption after the power supply line ...

AI Technical Summary

Problems solved by technology

The protection functions of the miniature circuit breaker include overload protection, short circuit protection and leakage protection, but because the miniature circuit breaker does not have the function of automatic reclosing, it needs manual power transmission after a power failure occurs, which increases the operating procedures and labor costs, which is not in line with modern The trend of intelligence will reduce the market share; secondly, the miniature circuit breaker does not have the function of communication networking and cannot monitor the user's electricity consumption in real time, so it is very difficult to locate the fault point of the power consumption after the power supply line fails, which affects the entire Stable power supply of three power supply lines

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