Transient wave recording indicator

Abstract

The invention relates to the technical field of power supply line fault detection, in particular to a transient wave recording indicator. The transient wave recording indicator comprises an MSP430FR697xPM / RGC, a current and electric field collection unit and an external power taking and internal power supply unit, wherein the current and electric field acquisition unit comprises an electronic current collector, and a rectifier bridge is connected with an overhead line through a high-magnetic conductivity CT power taking sensor. The current and electric field collection unit has a strong online power taking ability, and normal work in the case of power taking current of 5A can be realized; due to the external power taking and internal power supply unit, + / -1% high-precision measurement current can be realized; three-phase synchronous timing precision can reach + / - 50 mus; accurate positioning of grounding fault of a small-current grounding system, particularly, transient grounding fault, complex intermittent grounding fault and high-resistance grounding fault can be realized; backtracking inversion is carried out on a complex fault process through wave recording waveforms, and a strong basis is provided for fault analysis; and early warning is carried out in advance when the line is in an abnormal state.

Description

technical field [0001] The invention relates to the technical field of power supply line fault detection, in particular to a transient wave recording indicator. Background technique [0002] The two main forms of distribution network lines are: cable lines laid underground and overhead lines erected with poles and towers. For the distribution network lines in big cities, especially in the main urban area, the underground cables are basically used, and the grounding method is usually adopted through a small resistance. In this way, when a single-phase ground fault occurs, a large continuous power frequency (50Hz) fault can be generated. Phase current and power frequency zero-sequence current, ground fault detection and location are relatively easy. For the distribution network lines in non-main urban areas of large cities, small and medium-sized cities, urban-rural fringe areas, and vast rural areas and pastoral areas, the overhead line distribution network is still the main...

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages: the performance of the current transformer in the measurement of linearity, bandwidth, and transient response is not high, especially when the ferromagnetic material is saturated when the current is large; the ability to pick up the current signal of the distribution network line is weak; the measurement current accuracy is low

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