Power transmission line transient current collecting device

Abstract

The invention discloses a power transmission line transient current collecting device. The power transmission line transient current collecting device comprises a current sensing module, a collecting module, a traveling wave triggering module and a controller. The current sensing module is used for detecting the transient current of a power transmission line and outputting a corresponding traveling wave analog signal. The collecting module is used for performing analog-digital conversion on the traveling wave analog signal, and storing a converted traveling wave digital signal. The traveling wave triggering module is used for detecting whether the traveling wave analog signal exceeds a preset traveling wave threshold, if yes, emitting a first triggering signal and triggering the collecting module to stop the analog-digital conversion. The controller is used for reading and storing the traveling wave digital signal stored by the collecting module to a preset memory when the first triggering signal is detected. The current sensing module comprises a flexible Rogowski coil collecting a differential signal of the transient current and an active integral circuit restoring the differential signal output by the flexible Rogowski coil into the transient current. According to the invention, the sampling precision and reliability are improved, the traveling wave signal of the transient current can be restored effectively, and the fault of the power transmission line is precisely positioned.

Description

technical field [0001] The invention relates to the field of electric power monitoring, in particular to a transient current acquisition device for transmission lines. Background technique [0002] With the development of science and technology, electricity plays a vital role in people's work and life. The failure of the transmission line will cause great inconvenience to people. Therefore, it is the most important thing to find the fault point in time after the failure of the transmission line. [0003] Usually, after a fault occurs on a transmission line, the dispatcher mainly relies on the fault location data to determine the line inspection range command. However, the existing fault location device has a large error, which makes the line inspection range issued by the dispatcher larger. Whether it is an overhead line or a cable line, most of the faults do not have obvious burn marks, which brings great difficulties to the troubleshooting of fault points, especially at n...

AI Technical Summary

Problems solved by technology

However, when the current traveling wave method is used for fault location, due to the insufficient and attenuated measurement bandwidth of the traditional current transformer, it cannot effectively restore the traveling wave signal of the transient current, and it has the problem of heavy magnetic saturation

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