A 360-degree omni-directional ring network arc protection method

Abstract

The invention discloses a 360-degree omnibearing ring network electric arc light protection method. An electric arc light protection device carries out a real-time arc light detection on the end of a first transformer through an arc light sensor, detects whether arc light exists or not, monitors a current signal of the first transformer in real time through a first current sensor, and detects current increment; if arc light or current abnormality is detected, after an abnormal alarm is confirmed through rectification, filtering and threshold comparison treatment, the arc light protection device disconnects a high-voltage side circuit breaker or a low-voltage side circuit breaker of the first transformer; a current protection unit carries out the real-time arc light detection on the end of a second transformer through the arc light sensor, detects whether the arc light exists or not, monitors the current signal of the second transformer in real time though a second current sensor and detects the current increment; and if the arc light or current abnormality is detected, after the abnormal alarm is confirmed through rectification, filtering and threshold comparison treatment, the current protection device disconnects the high-voltage side circuit breaker or the low-voltage side circuit breaker of the second transformer.

Description

technical field [0001] The invention relates to the field of arc protection, in particular to a 360-degree omni-directional ring network arc protection method. Background technique [0002] In the power system, busbars with a voltage level of 35kV and below are generally not equipped with busbar protection. However, due to the large number of outgoing lines on the medium and low voltage busbars, frequent operations, and the distance between the three-phase conductor lines and the earth is relatively close, it is easy to be harmed by small animals, and the quality of equipment manufacturing is worse than that of high-voltage equipment. Poor conditions, changes in system operating conditions, human and operational errors and other reasons, the failure probability of medium and low voltage buses is much higher than that of high voltage and ultra high voltage buses. But for a long time, people have not paid enough attention to the protection of medium and low voltage buses, and...

AI Technical Summary

Problems solved by technology

However, due to the large number of outgoing lines on the medium and low voltage busbars, frequent operations, and the distance between the three-phase conductor lines and the earth is relatively close, it is easy to be harmed by small animals, and the quality of equipment manufacturing is worse than that of high-voltage equipment. Due to poor conditions, changes in system operating conditions, human and operational errors, etc., the failure probability of medium and low voltage buses is much higher than that of high voltage and ultra high voltage buses

But for a long time, people have not paid enough attention to the protection of medium and low voltage buses, and no advanced and reasonable solutions have been found. expansion, resulting in huge economic losses

In recent years, due to various reasons, medium and low-voltage switchgears have been severely burned, and some have even developed into serious fire disasters. The accidents of main transformers damaged by external short-circuit current impacts have also increased year by year, and these distribution network accidents have been improperly handled and even enlarged. It has developed into a transmission network accident, causing significant economic losses, and has aroused widespread concern in the power sector

The reason is mostly because there is no medium and low voltage busbar protection, and the fault cannot be quickly removed.

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