Method for detecting accuracy of low-power zero-sequence current transformer in ring main unit

Abstract

The invention relates to a method for detecting the accuracy of a low-power zero-sequence current transformer in a ring main unit, and the method is technically characterized in that an accuracy verification loop is built, and the accuracy of the zero-sequence current transformer is detected; building an electromagnetic interference simulation system under the single-phase short-circuit fault, simulating electromagnetic interference under the single-phase short-circuit fault, and detecting the accuracy of the electromagnetic interference under the single-phase short-circuit fault; and establishing an electromagnetic interference simulation system under the interphase short-circuit fault, simulating electromagnetic interference under the interphase short-circuit fault, and carrying out accuracy detection on the electromagnetic interference under the interphase short-circuit fault. According to the invention, the influence of a surrounding interference electromagnetic field on the low-power zero-sequence current transformer in the ring main unit can be effectively measured, the test problem of the zero-sequence current sensing equipment of the integrated ring main unit is solved, the accuracy of the low-power zero-sequence current transformer can be detected more truly, the quality of the primary and secondary fusion ring main unit is improved, and the test efficiency is improved. And the protection and control of the distribution network side are better realized.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment operation detection, in particular to a method for detecting the accuracy of a low-power zero-sequence current transformer in a ring network cabinet. Background technique [0002] The current transformer is an important current measurement device in the ring network cabinet, which is used to provide primary current information for relay protection, measurement control, etc. In order to solve the problems of magnetic circuit saturation and poor anti-interference ability of the electromagnetic current transformer in the traditional ring network cabinet, a large number of electronic current transformers have been used in the primary and secondary fusion ring network cabinets promoted in recent years. In terms of sequence signal acquisition, the low-power coil is used as the current sensor, and the design of the traditional independent zero-sequence coil is cancelled. After the three-phas...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method for detecting the accuracy of low-power zero-sequence current transformers in the ring network cabinet, and solve the problem of testing the zero-sequence current sensing equipment of the integrated ring network cabinet

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