Fault direction detection method and device, relay and computer readable storage medium

Abstract

The invention provides a fault direction detection method and device, a relay and a computer readable storage medium. The fault direction detection method comprises the steps that when relay protection is started, the fault voltage data and the fault current data of a fault line are synchronously acquired; a line mode voltage fault component is determined according to the fault voltage data, and a line mode current fault component is determined according to the fault current data; correlation calculation is performed on the line mode voltage fault component and the line mode current fault component so as to obtain the characteristic correlation coefficient; and the fault direction of the line fault can be determined according to the characteristic correlation coefficient. With application of the technical scheme, the fault direction can be sensitively judged when the fault occurs near the zero crossing point of the voltage, and the motion speed is within a few milliseconds without the influence of the limited frequency band of the capacitive voltage transformer commonly used in the high voltage power transmission line so that the reliability of fault direction detection can be enhanced.

Description

technical field [0001] The present invention relates to the field of power systems, in particular to a method for detecting the direction of a traveling wave fault of a high-voltage transmission line, a device for detecting the direction of a traveling wave fault of a high-voltage transmission line, a relay for the direction of a traveling wave, and a computer-readable storage medium. Background technique [0002] With the continuous growth of my country's electricity demand, an interconnected grid pattern connected by ultra-high voltage lines and high-voltage power grids has gradually formed. Among them, ultra-high voltage lines, as the main artery of power grid transmission energy, require fast, reliable, sensitive and selective relay. Electrical protection ensures the safe and stable operation of the entire grid system. [0003] In related technologies, due to the problems of long transmission distance, large distributed capacitance, large grounding resistance, long fault...

AI Technical Summary

Problems solved by technology

[0005] (1) When the fault occurs at the voltage zero crossing point, no obvious fault traveling wave will be generated, resulting in failure to capture the wave head of the fault traveling wave

[0006] (2) Capacitive voltage transformers commonly used in high-voltage transmission lines have limited bandwidth and cannot effectively transmit high-frequency transient traveling waves, resulting in failure to capture fault voltage traveling waves

Images