Fault distance measuring system based on optical current transformers and method

Abstract

The invention relates to a fault distance measuring system based on optical current transformers and a method. The system comprises the optical current transformers, traveling wave distance measuring devices, switches and clock acquisition devices which are respectively arranged in two transformer stations and are sequentially connected, each optical current transformer comprises an optical current transformer sensitive unit and an optical current transformer acquisition unit which are connected through a first optical cable, the optical current transformer sensitive units are respectively arranged at two ends of a power transmission line, a traveling wave signal output end of each optical current transformer acquisition unit is connected with an input end of the traveling wave distance measuring device in the same transformer station through a second optical cable, the fault distance measuring system further comprises a main data processing station, and output ends of the traveling wave distance measuring devices of the two transformer stations are inputted to the main data processing station through a third optical cable. Through the system, a distance measuring error is reduced to a great degree, reliability and precision are improved, and traveling wave distance measuring requirements of an intelligent transformer station are satisfied.

Description

technical field [0001] The invention relates to the technical field of distance measurement for transmission network faults, in particular to a fault distance measurement system and method based on optical current transformers. Background technique [0002] The rapid and reliable detection of transmission network faults is one of the main functions to realize the safe and reliable operation of smart grids. At present, in my country's 110kV and above power grids, transmission line fault location systems are widely used in substations whose neutral points are directly grounded. It is based on electromagnetic transformers to collect fault traveling wave signals, and uses hard cables to connect the analog output of electromagnetic transformers to traveling wave distance measuring devices. When the amount of collection increases or changes, the corresponding collection lines and wiring must be adjusted, which increases the workload of operators and the probability of system errors...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at problems such as poor ranging reliability and low precision that cannot meet the needs of digital substations caused by the use of electromagnetic transformers in existing transmission line fault location systems, and provides a fault location system based on optical current transformers. The current transformer realizes high-fidelity traveling wave acquisition, and uses the optical cable to transmit the digital signal to the traveling wave ranging device, which greatly reduces the ranging error, improves its reliability and accuracy, and meets the traveling wave ranging requirements of smart substations

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