Single-phase grounding travelling wave protection method and device and computer equipment

Abstract

The invention provides a single-phase grounding travelling wave protection method and device and computer equipment. The method comprises the steps of judging whether disturbance occurs in a non-powersupply end of a relay in a circuit or not when travelling wave disturbance occurs in the circuit; judging whether a single-phase grounding fault occurs in the non-power supply end of the relay or notwhen that disturbance occurs in the non-power supply end of the relay is judged; giving out a trip signal according to time delay set on the basis of a stepped principle when the single-phase grounding fault is judged; and giving out a trip command by the relay at a non-power supply side of the circuit according to the detected change condition of three-phase power frequency electrical quantity if the relay gives out the trip command according to the trip signal. By the technical scheme, power circuit protection is achieved, full-line trip acceleration is achieved, the single-phase groundingfault is rapidly and selectively removed from two ends of the circuit, a condition is provided for rapid recovery of normal power supply of the circuit, the running reliability of the power circuit isimproved, a communication passage is not needed, and the method has favorable economy and practicability.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201711367445.3 and the title of the invention "Single-phase grounding traveling wave protection method and device and computer equipment" submitted to the China Patent Office on December 18, 2017, the entire content of which is incorporated by reference incorporated in this application. technical field [0002] The present invention relates to the technical field of power system protection and control, in particular to a single-phase grounding traveling wave protection method, a single-phase grounding traveling wave protection device, a computer device, and a computer-readable storage medium. Background technique [0003] Most of the existing distribution network protection technologies adopt the traditional overcurrent protection set according to the trapezoidal principle. This technology is suitable for single-power radial multi-section branch power lines widely used i...

AI Technical Summary

Problems solved by technology

However, the existing protection technology based on traveling wave information also has its own shortcomings. For example, it is difficult to distinguish the traveling wave generated by faults from the traveling wave generated by system disturbances such as lightning strikes or even switching operations, and it is easy to malfunction. It cannot be used in multi-section branch power lines. Remove the fault from both ends of the faulty line

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