Automatic distribution terminal with distribution network single-phase grounding fault detection function

Abstract

The invention discloses an automatic distribution terminal with a distribution network single-phase grounding fault detection function. The automatic distribution terminal comprises an acquisition unit for synchronously acquiring transient components of zero sequence voltage and zero sequence current of a distribution line single-phase grounding fault, a digital filtering unit for filtering the acquired transient components of the zero sequence voltage and the zero sequence current and acquiring band-pass frequency band signals of the corresponding analog quantity, an FFT (Fast Fourier Transform) processing unit for performing FFT operation on the acquired band-pass frequency band signals of the analog quantity, a protective logical operation unit for calculating the data analysis result of the FFT processing unit to analyze and calculate a ground capacitance parameter, a control action unit for judging a regional fault and controlling a driving switch to switch off when the ground capacitance parameter is negative, and a power module for providing a working power supply. The automatic distribution terminal has a single-phase grounding fault detection function, excellent performance and high sensitivity and improves the accuracy and the efficiency fixedly set by the detection technology.

Description

technical field [0001] The invention relates to the field of power distribution automatic control equipment, in particular to a power distribution automation terminal with a distribution network single-phase ground fault detection function. Background technique [0002] After more than ten years of development in the feeder automation of overhead lines in 10kV distribution network, its technologies and products (such as voltage time type, current counting type, etc.) have been developed very mature and widely used, and phase-to-phase short-circuit faults have also been effectively diagnosed . However, single-phase ground faults are subject to neutral point operation mode and harsh operating environments such as lightning, strong winds, etc. The judgment and indication of such faults are the focus of general attention of all power supply companies, and it is also a technical difficulty in the distribution automation industry. According to statistics, the single-phase groundi...

AI Technical Summary

Problems solved by technology

Due to the complexity of the line branches, after the power distribution terminal is put into operation, the line reconstruction often expands the branches again. The setting of the fixed values ​​of various detection technologies is heavy and difficult. It often happens that the principle is correct but the test results are caused by inaccurate setting of the fixed values. Error, fault location error, resulting in extended power outage

Images