Online testing method of electrical arc light protection unit

Abstract

The invention relates to an arc light protection unit on-line test method, (1) installs the arc light sensor in the switch cabinet, and around the arc sensor fixed the simulation light source of which light intensity is adjustable; (2) under the electric system normal operation condition, through the change-over switch temporarily relieves the arc light protection unit and the electric system electrical connection, and connect with the test unit; (3) the test unit contrl the simulation fault current and simulation light intensity which brought to arc protection unit, the movement performance of test arc protection unit under the certain intensity light and current effect; (4) the test unit automatic logging the arc protection unit test result under the certain intensity light and current effect, judge the arc protection unit operating whether or not normal. The invention can on-line test and log the precise movement parameter of the arc protection unit under the different current and light intensity effect, and supplies a precise test means for guaranting the arc protection unit unitreliable movement.

Description

technical field [0001] The invention relates to a method for testing a switchgear protection unit in a power system, in particular to a method capable of online testing of an arc light protection unit under normal operating conditions of the power system. Background technique [0002] When a short-circuit fault occurs in the switchgear, the generated arc quickly releases energy, causing the pressure and temperature in the switchgear to increase rapidly, and the energy generated by the arc is in the form of I 2 The t index law rises rapidly, so once the arc is ignited, the surrounding air will be ionized immediately, resulting in strong explosive pressure and high temperature. If it is not cut off in time, it will cause a major accident. At present, switchgear in medium and low voltage systems usually adopts the following three protection methods: (1) Transformer backup overcurrent protection, whose protection action time is 1.2s ~ 1.4s; Over-current protection, the protecti...

AI Technical Summary

Problems solved by technology

However, the current testing methods for arc protection units are all offline testing methods, such as testing the action performance of the arc protection unit by adjusting the intensity of the light source offline and simulating the magnitude of the fault current, or using a light source such as a hand-held flashlight to test the arc protection unit. However, the above two arc protection test methods are too simple to accurately detect the actual action parameters of the protection control unit

[0004] In the power system, the arc protection unit is mainly responsible for the short circuit protection of the power system bus, and the accuracy and sensitivity of the arc sensor of the arc protection unit are very easily affected by factors such as environmental pollution, so that the accuracy and speed of the protection device action sex changes

Therefore, the refusal and misoperation of the protection device will cause major losses

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