Portable warning and protecting device for grounding fault of apparatus

Abstract

The invention relates to a portable warning and protecting device for grounding fault of an apparatus. The portable warning and protecting device comprises a ground wire monitoring circuit and an abnormal warning circuit. The ground wire monitoring circuit comprises a filtering inductor, a power supply, a protection diode and a resistor, one end of the filtering inductor is grounded while the other end of the filtering inductor is sequentially serially connected with the power supply, the protection diode and the resistor, and the other end of the resistor is connected at a grounding end of an apparatus shell. The abnormal warning circuit comprises a bi-stable circuit module, a triode, a two-channel relay and a warner, an input interface of the bi-stable circuit module is connected with the grounding end of the apparatus shell, an output interface of the bi-stable circuit module is connected with a base of the triode, an emitter of the triode is connected with a coil of the two-channel relay, the triode drives the two-channel relay to act, one end of a normally open contact of the two-channel relay is connected with the grounding end of the apparatus shell while the other end of the normally open contact of the two-channel relay is grounded to form a protection loop, and one end of another normally open contact of the two-channel relay is connected with a collector of the triode and connected with a power supply while the other end of the normally open contact of the two-channel relay is connected with the warner to form a warning loop. The portable warning and protecting device is capable of guaranteeing reliable grounding of the apparatus, so as to prevent equipment loss and possible personal harm caused by accidental grounding fault of the apparatus.

Description

technical field [0001] The invention relates to a ground loss alarm and protection device for a portable instrument applied in a power system. Background technique [0002] In the power system work, grounding, especially the grounding of the instrument shell is very common in field work. The function of grounding is to prevent the shell from being charged when the instrument fails, causing the operator to get an electric shock. The method of grounding is to use a metal clip to connect the instrument casing to the grounding pile with wires. However, when the connection between the metal clip and the grounding pile is not firm, or if someone does not touch the grounding wire during field work, the instrument will lose grounding protection. The high voltage rising to tens of thousands of volts will not only damage the equipment, but even cause personal electric shock accidents, resulting in personal casualties. Contents of the invention [0003] The purpose of the present in...

AI Technical Summary

Problems solved by technology

The method of grounding is to use a metal clip to connect the instrument casing to the grounding pile with wires. However, when the connection between the metal clip and the grounding pile is not firm, or if someone does not touch the grounding wire during field work, the instrument will lose grounding protection. The high voltage rising to tens of thousands of volts will not only damage the equipment, but even cause personal electric shock accidents, resulting in personal casualties

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