Ultra high-speed traveling wave direction pilot protection method, device and system for high voltage transmission line

Abstract

The invention provides a traveling wave direction pilot protection method, which comprises the following steps of: respectively acquiring a wave head polarity of a current fault initial traveling wave and an initial polarity of a power frequency component in a voltage fault traveling wave at the first side of the high voltage transmission line, and respectively acquiring a wave head polarity of a current fault initial traveling wave and an initial polarity of a power frequency component in a voltage fault traveling wave at a second side of the high voltage transmission line; comparing a wave head polarity of a current fault initial traveling wave with an initial polarity of a power frequency component in a voltage fault traveling wave at a local side so as to determine a fault direction at the local side; and exchanging information of a fault direction at the first side with information of a fault direction at the second side, comparing the information of the fault directions between the two sides, judging whether the high voltage transmission line has an internal fault and determining whether to carry out the operation of relay protection. The invention also provides a traveling wave direction pilot protection device and a traveling wave direction pilot protection system, which can be applied to the high voltage transmission line and can rapidly and accurately detect the fault and the type of the fault and carry out protection operation.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method, device and system for longitudinal protection of high-voltage transmission lines in the direction of ultra-high-speed traveling waves. Background technique [0002] Traditional relay protection based on power frequency electrical quantities is affected by factors such as distributed capacitive current of high-voltage transmission lines, current transformer saturation, power system oscillation and transition resistance, and cannot accurately detect faults on the line, and the action speed is generally around 20ms . [0003] The current fault traveling wave and voltage fault traveling wave after a high voltage transmission line fault contain a wealth of fault information, which can be used as the basis for fault detection. The voltage fault traveling wave and current fault traveling wave signal after the fault is a signal with a wide spectrum range. The current transformer h...

AI Technical Summary

Problems solved by technology

At the same time, due to the high data sampling rate of traveling wave protection, generally hundreds of thousands of hertz, the amount of data collection and data processing are large, and the protection device has high requirements for data processing speed, so traveling wave protection is also important for the protection hardware platform. Putting forward higher requirements, the traditional relay protection hardware platform based on power frequency electrical quantities can no longer meet the needs of traveling wave protection

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