A 10kv overhead line lightning strike disconnection alarm device based on fault current detection

Abstract

The application discloses a fault current detection based lightning-stroke wire breakage warning device for a 10kV overhead line. The device comprises a current detection unit, a control unit, a trigger circuit and a warning unit, wherein the current detection unit is used for detecting a delivered current on the overhead line; an input end of the control unit is connected to an output end of thecurrent detection unit; an output end of the control unit is connected to the trigger circuit; an output end of the trigger circuit is connected to the warning unit; the control unit is configured tostart a timing unit when the delivered current is judged to be more than or equal to a preset short-circuit current, and is also configured to control the trigger circuit to generate a trigger signalwhen the delivered current is judged to be more than or equal to a preset earth fault current after the timing unit finishes timing; and the warning unit is used for generating warning information according to the trigger information. Through the device provided by the technical scheme in the application, the reliability and accuracy of lightning-stroke wire breakage detection are improved; the possibility that an excess voltage causes false warning is decreased; and the urgent repair and the quick power supply recovery are facilitated.

Description

technical field [0001] The present application relates to the technical field of lightning strike disconnection detection, in particular, to a lightning strike disconnection alarm device for 10kV overhead lines based on fault current detection. Background technique [0002] At present, overhead insulated conductors are generally used in the transmission lines of my country's distribution network. In thunderstorm weather, overhead insulated conductors are prone to lightning strike and disconnection accidents. The process of lightning disconnection can be divided into two stages: the first stage is that the lightning overvoltage breaks down the insulation layer of the wire, and the wire discharges to the ground. The wire will not blow. In the second stage, the power frequency voltage of the system is applied to the lightning discharge ionization channel. Since the insulation layer breaks down to a point, the power frequency arc continues to burn at this point, resulting in ex...

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Problems solved by technology

[0003] In the prior art, lightning arresters or lightning protection disconnection devices are usually installed to prevent lightning disconnection of overhead lines, but it is not considered that lightning disconnection may still occur. If the alarm cannot be timely and effectively, It not only consumes manpower and material resources to search for the accident point, prolongs the maintenance time, reduces the reliability of power supply, but also may cause personal safety accidents

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