Zero-sequence current measurement system and method for novel 10kV overhead line and performance test platform

Abstract

The invention discloses a zero-sequence current measurement system and method for a novel 10kV overhead line and a performance test platform, and aims to realize zero-sequence current 0-3.5kA measurement for the equivalent transmission line by taking rare earth magneto-optic glass as a core element on the basis of a magnetic field equivalence principle. A measuring device mainly comprises a function signal generator, a power amplifier, a protective resistor, a solenoid, an integrated probe, a laser power supply, a laser tube, an input optical fiber, an output optical fiber, an optical probe, acurrent probe and an oscilloscope. According to the measuring method, the AC and DC response error is lower than 0.4%, the frequency response error is smaller than 4.8% within the range of 0-40 kHz,the transient response error is smaller than 4.1%, and the measuring method has engineering application value for achieving full-wave monitoring, auxiliary accident analysis and the like for the zero-sequence current of the 10kV overhead line.

Description

Technical field [0001] The invention relates to the technical field of high voltage and insulation, in particular to a new type of 10kV overhead line zero sequence current measurement system and measurement method, and a platform for performing performance testing on the system. Background technique [0002] With the progress of the times and the development of science and technology, the power system is mainly developing in the direction of networking, automation, large capacity, and intelligence. my country’s power system is also gradually developing in the direction of large units, high voltage and high automation. The level requirements for measuring and protection equipment are also stricter. At present, my country's power industry is in a golden period of development. During this period, various industries with the power industry as the backbone are developing at an astonishing speed. The smart grid is becoming more and more advanced, and the power system is automated. More ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the zero-sequence current transformer of a 10kV overhead line is easily saturated, the frequency band is narrow, and the insulation coordination is difficult, etc., in transient current measurement, the present invention provides a zero-sequence current measurement system and method for a 10kV overhead line, and based on the System Performance Test Platform

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