Transformer secondary side zero-phase safety grounding device

Abstract

The invention relates to a transformer secondary side zero-phase safety grounding device, which comprises two grounding outgoing lines and fluorescent lamp starters. The two grounding outgoing lines are connected with two binding posts of the fluorescent lamp starters respectively, the two fluorescent lamp starters are connected in parallel, quartz sand is poured into the two fluorescent lamp starters, the shells of the two fluorescent lamp starters are coated with irreversible temperature indicating paint, the color changing temperature of the temperature indicating paint is 50-60 DEG C, the other ends of the grounding outgoing lines ar connected with a grounding body and a zero-phase loop of the secondary side of a protected mutual inductor, and anti-interference capacitors are arranged in the two fluorescent lamp starters. The joint parts of the fluorescent lamp starters and the grounding outgoing lines are coated with an insulating material. Compared with the prior art, the transformer secondary side zero-phase safety grounding device is advantageous in that the hidden danger that the secondary loop is burnt by zero-phase multi-point grounding or grounding current of the grounding grid can be effectively avoided.

Description

technical field [0001] The invention relates to a power safety auxiliary device, in particular to a transformer secondary side zero-phase safety grounding device. Background technique [0002] During the normal operation of the zero-phase circuit of the transformer, its current and voltage cannot be accurately detected due to the three-phase balance. If there are problems such as grounding open circuit and multi-point grounding, it will cause serious accident hazards. However, the zero drift and accuracy of the general multimeter are not enough to accurately detect the hidden dangers of the zero-phase circuit, and the sampling value of the protection device cannot observe the abnormal symptoms of the zero-phase circuit. However, once there is a problem with the zero-phase circuit, such as multi-point grounding, open circuit, etc. , when a ground fault occurs in the equipment, the relay protection is likely to refuse to operate or malfunction, causing serious consequences for...

AI Technical Summary

Problems solved by technology

[0002] During the normal operation of the zero-phase circuit of the transformer, its current and voltage cannot be accurately detected due to the three-phase balance. If there are problems such as grounding open circuit and multi-point grounding, it will cause serious accident hazards.

However, the zero drift and accuracy of the general multimeter are not enough to accurately detect the hidden dangers of the zero-phase circuit, and the sampling value of the protection device cannot observe the abnormal symptoms of the zero-phase circuit. However, once the zero-phase circuit has problems, such as multi-point grounding, open circuit, etc. , when a ground fault occurs in the equipment, the relay protection is likely to refuse to operate or malfunction, causing serious consequences for the expansion of the accident. Therefore, how to scientifically and effectively detect the zero-phase open circuit and grounding conditions of the relay protection secondary equipment, Significant

However, the number of secondary circuits of transformers in the power system is very large, and it is difficult to detect the zero-phase grounding situation through manual measurement on a regular basis, and the labor intensity is high

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