Travelling wave sensing device for measuring voltage travelling waves

Abstract

The invention discloses a travelling wave sensing device for measuring voltage travelling waves. The travelling wave sensing device comprises a travelling wave sensor body and a signal processing circuit connected with the secondary side of the travelling wave sensor body, wherein the output end of the signal processing circuit is connected with the input end of a travelling wave head detection circuit. The travelling wave sensor body of the travelling wave sensing device has ideal amplitude-frequency, phase-frequency and transient characteristics of a band-pass filter, can meet the requirement for current and voltage steady state quantity detection and has the advantage that detected time delay is very small. The signal processing circuit directly identifies travelling wave heads, detects the polarity of the travelling wave heads and records the arrival moment of the travelling wave heads through a hardware circuit and performs protection and fault positioning, and protection accuracy and speed can be improved.

Description

technical field [0001] The invention relates to a sensing device, in particular to a traveling wave sensing device for measuring voltage traveling waves. Background technique [0002] my country's electric power industry is developing vigorously and rapidly. Long-distance high-voltage or ultra-high-voltage transmission lines are exposed in the wilderness, and most of them are mountainous and hilly terrains in my country. Rainstorms, lightning and other weather reasons and human factors often cause line failures. The rapid and precise location of fault points has always been a problem that has not been completely solved by the power sector. It poses a great threat to the safety, high-quality, and economical operation of the power system, and it also brings a heavy burden to line operation and maintenance personnel. The electricity sector has brought incalculable losses. Quickly and accurately determining the fault point after a transmission line fault is a key technology to ...

AI Technical Summary

Problems solved by technology

Commonly used transmission line fault location methods mainly include impedance method, traveling wave method and voltage distribution method. Due to the defects in principle, the impedance method is difficult to guarantee the positioning accuracy; the voltage distribution method is also difficult to guarantee due to the influence of transition resistance and line parameters. The accuracy of distance measurement results; with the continuous advancement of computer, communication and measurement technology, the traveling wave method has developed rapidly and gradually entered the practical stage

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