Circuit breaker with grounding protection function and electric leakage protection function

Abstract

The invention relates to a circuit breaker with a grounding protection function and an electric leakage protection function. The circuit breaker comprises the components of four current transformers (CT1,CT2,CT3,CT4), one double-tap zero-sequence mutual inductor (CTZ), a dial switch (S1), resistors (R1,R2), a button (S2) and an intelligent tripping device (CE). Switching between different signals is realized through matching between the dial switch (S1) and the double-tap zero-sequence mutual inductor (CTZ). After data acquisition and conversion by the intelligent tripping device (CE), protection is performed. Combination of the grounding protection function and the electric leakage protection function is realized. According to the circuit breaker, free switching between the electric leakage protection function and the grounding protection function is realized through changing the position of the dial switch (S1), production cost of the circuit breaker and user cost are reduced. Furthermore the circuit breaker can satisfy a requirement of a power supply system for selection from grounding protection and electric leakage protection.

Description

technical field [0001] The invention belongs to a circuit breaker, in particular to a circuit breaker with the functions of grounding protection and leakage protection. Background technique [0002] With the rapid and extensive application of electronic technology in various fields, intelligent circuit breakers have also appeared in circuit breakers, with overload long delay, short circuit short delay, short circuit instantaneous, grounding protection and leakage protection and other functions. Among them, the grounding protection and leakage protection functions do not exist at the same time in the same circuit breaker at present. If the leakage protection function is provided, there is no grounding protection function. If the grounding protection function is provided, there is no leakage protection function. When the user needs to change the protection function , you can only choose to purchase another circuit breaker. If manufacturers want to produce circuit breakers wit...

AI Technical Summary

Problems solved by technology

The reason is that although the protection principles of the two protection functions are similar, their protection ranges are different, and there are conflicts between them. At present, there is no same device that can realize the two functions.

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