Aftercurrent action protector with self-diagnostic function

Abstract

The invention provides a residual current operated protective device with the functions of self-diagnosis indicating and / or self-diagnosis alarming and / or self-diagnosis protection, comprising the parts of the protector such as a protector, a zero sequence current transformer, a release shunting coil, a residual current processing circuit, a rectifier circuit, a controllable silicon SCR, etc., and conventional circuits. The residual current operated protective device also comprises a self-diagnosis indicator circuit and / or a self-diagnosis alarming circuit and / or a self-diagnosis protection circuit which can carry out the real-time diagnosis for the rectifier circuit of the protector and the controllable silicon SCR; when the unusual condition occurs to the rectifier circuit and the controllable silicon SCR, the self-diagnosis indicator circuit automatically gives out the instruction, the self-diagnosis alarming circuit automatically alarms and the self-diagnosis protection circuit automatically drives the releasing device to be released, thus preventing the personal safety accident caused owing to the failure of the residual current protection function and greatly reinforcing thesafety usage performance of the protector products.

Description

technical field [0001] The invention relates to a residual current action protector, also known as a leakage protector, in particular to a residual current action protector with the functions of self-diagnosis indication, self-diagnosis alarm and self-diagnosis protection. Background technique [0002] Residual current action protector is a protector with leakage protection function, also called leakage protector, which is composed of protector body, zero sequence transformer and leakage accessories. The leakage accessory is a circuit composed of electronic components, and its function is to amplify the residual current signal detected by the zero-sequence transformer and control the tripping of the circuit breaker. The tripping of the circuit breaker refers to the process in which the main switch in the protector is automatically converted from the closed state to the open state. [0003] like figure 1 The working principle of the shown prior art residual current action p...

AI Technical Summary

Problems solved by technology

[0010] First of all, the circuit is complex, and the number of electronic components used is large, especially the dual zero-sequence transformer, dual thyristor and expensive single-chip microcomputer, so processing and debugging are very difficult, the manufacturing cost is high, and the product is large and heavy;

[0011] Secondly, there are fewer functions, only the abnormal indication and protection function are added on the basis of the usual leakage protector, and there is no necessary alarm function;

[0012] The third is that due to the large number of electronic components, the failure probability of the circuit itself is high, and the reliability and stability of the product are poor;

[0013] The fourth is that due to the use of single-chip microcomputers in the circuit, the requirements for the product's use environment are high, and its use is limited.

[0014] Due to the above defects, the practical significance of this prior art is very limited, especially in small plastic case protectors, the impact of the above technical defects on the actual use of the product is more prominent

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