Electric wire netting arc extinguishing system

Abstract

The invention discloses an extinguishing arc system for power network, which comprises a voltage transformer connected to power network, a monitor to receive signal from transformer and control connected three-phase vacuum contactor. This invention has high running reliability.

Description

Technical field: [0001] The invention relates to a power supply or power distribution circuit system, which is an arc suppression and harmonic elimination and overvoltage protection system. Background technique: [0002] The vast majority of my country's 3-35KV power grid is a neutral point ungrounded system, and the overvoltage generated when the internal overvoltage occurs when the single-phase arc is grounded and the ferromagnetic resonance overvoltage excited by it is a major threat to the safe operation of the power grid. The frequency of its failure is high, the scope of influence is wide, and the loss caused is huge. [0003] my country's existing operating regulations stipulate that when a single-phase ground fault occurs in a system that is not directly grounded at the neutral point, it is allowed to continue running for two hours. If approved by the relevant department at the higher level, it can be extended, but the concept of single-phase ground fault is not speci...

AI Technical Summary

Problems solved by technology

Due to the long duration of the arc grounding overvoltage, it often exceeds the withstand capacity of the arrester and causes the arrester to explode

[0005] In the prior art, there are mainly methods for limiting arc grounding overvoltage; foreign countries adopt a neutral and direct grounding method for 3-35KV voltage grids. When the single-phase is grounded, artificially increase the short-circuit current to trip the circuit breaker. Regardless of the nature and importance of the load, whether it is completely grounded or not completely grounded, the faulty line must be cut off by the protection device. Due to the increased fault current, the grounding point will be burned. exacerbated

In order to solve the long-term arcing caused by arc grounding in China, the short circuit between phases is caused by arcing. The disadvantage is that it is easy to produce series resonance overvoltage and phantom grounding, which amplifies the transfer overvoltage from the high voltage side of the transformer to the low voltage side, and makes the small current grounding line selection device Sensitivity reduction cannot even be counteracted, so arc-flash ground overvoltage cannot be effectively limited

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