A fault recording device and distance measuring method based on the principle of voltage traveling waves

Abstract

The invention relates to a fault recording device based on a voltage traveling wave principle and a range finding method. The fault recording device based on a voltage traveling wave principle comprises a recording criterion unit, a traveling wave unit, a time synchronization unit, and a management unit which are all installed in a wave recorder simulating cabinet. The management unit is connected with the traveling wave unit and the recording criterion unit. The recording criterion unit determines recording activation and computes various characteristic parameters. The traveling wave unit determines the coming time of the head of a traveling wave in combination with software and hardware. The time synchronization unit is connected with a required time module and provides reliable and accurate system time for the device. The management unit performs communication management, recording management, comprehensive criterion management, and system task management. A bus voltage travelling wave is integrated into the fault recording device so as to increase power transmission line fault point positioning accuracy in the fault recording device and greatly shorten fault line inspection and fault repair time.

Description

technical field [0001] The invention relates to the technical field of wave recording and ranging for relay protection faults in electric power systems, in particular to a fault recording device and a distance measuring method based on the principle of voltage traveling waves. Background technique [0002] High-voltage transmission lines and transmission corridors are complex and prone to failure. In particular, EHV transmission lines have a long transmission distance, are exposed in the wilderness, and are mostly mountainous and hilly terrains, which are the places with the highest failure rate in the high-voltage transmission network. Transmission line faults pose a great threat to the safe operation of the system, and also bring a heavy burden to line operation and maintenance personnel to find fault points. The fast and accurate location of the fault point can greatly shorten the time of fault repair, reduce the loss caused by power failure, improve the reliability of t...

AI Technical Summary

Problems solved by technology

[0005] CN201310059206 uses the current signal to analyze the traveling wave algorithm. The traveling wave plug-in can access 15 current signals at most, and for a common double-bus wiring substation, there are at least 64 current channels in the case of full configuration, so this disclosure The technology cannot meet the configuration requirements. When the faulty line is one of the (64-15) lines that are not configured with the traveling wave channel, the traveling wave plug-in does not play a corresponding role, which has great limitations.

[0006] CN201310059206 Traveling wave sampling rate is 1M, which can no longer meet the requirements of the current standard (the national standard requires that the sampling rate of traveling wave ranging is not less than 2M), and is limited by the performance of the hardware platform and the communication rate of the built-in switch (under the adoption rate of 2M, 15 channel current Wave data traffic is 480Mb, much larger than the switch traffic limit)

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