Device for judging fault of remote leakage protector and blockage or fault of alternating current contactor, and analysis method thereof

Abstract

The invention discloses a device for judging fault of a remote leakage protector and blockage or fault of an alternating current contactor, and an analysis method thereof. The analysis method comprises the following step of: judging whether a field protector device and a contactor successfully switch off and on by a method of reading a low-voltage outgoing line zero sequence current value, a three-phase current value and on/off state data of a protector through a remote monitoring system. Therefore, through adoption of the device and the analysis method thereof, disclosed by the invention, whether an inner control circuit of the protector has the fault or not and whether the contactor has faults of forced blockage and self-contact adhesion or not can be judged by utilizing an indirect electric measurement method, and an effect that remote trial jump and the field protector button trial jump detection are same is also guaranteed, thus a large amount of labor operation time is saved.

Description

technical field [0001] The invention relates to a device for judging the failure of a remote leakage protector and the blockage or failure of an AC contactor and an analysis method thereof. Background technique [0002] In many applications of current power supply enterprises, the leakage protector (hereinafter referred to as the protector) and the AC contactor are combined into a leakage protector device. When the current action value is reached, the action signal will open the contact of the breaker inside the protector, cut off the current to the contactor coil, and the contacts of the contactor will separate, so as to achieve the effect of stopping the power supply of the low-voltage power supply line. If the internal relay contact of the protector is faulty, the false action is pasted, specifically, the control circuit of the protector cannot achieve the function of separating the AC contactor. If the control circuit of the protector itself is normal, but the AC contac...

AI Technical Summary

Problems solved by technology

If the control circuit of the protector itself is normal, but the AC contactor is artificially blocked and forced to supply power or the upper contact is forcibly connected to the lower contact

The consequence is that when there is a large leakage current in the low-voltage line, the device cannot prevent direct contact electric shock accidents, indirect contact electric shock accidents, electrical fires and electrical equipment damage accidents caused by grounding faults of electrical equipment.

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