A Fault Traveling Wave Acquisition Device and Fault Traveling Wave Acquisition System for Medium Voltage Distribution Network

Abstract

The invention discloses a fault traveling wave collecting device and system for a medium voltage distribution network. The fault traveling wave collecting device is provided with a low-speed phase voltage collecting circuit and a trigger circuit to detect whether a power transmission line is in fault or not at the sample rate of 2 kHz, and after the line is in fault, a high-speed traveling wave signal collecting circuit is used for collecting the current and voltage signal of the traveling wave at the sample rate of 1 MHz, and therefore, the device and the system can ensure high precision and high integrity for the traveling wave collection by ensuring high traveling wave sample rate, and at the same time, the requirements for the capacity of processing, storing and transferring data for the device are reduced, and the problem of the contradiction between the collecting requirements of high integrity and high precision of the traveling wave signal and large data size at the high-speed collecting speed in the prior art is solved. The fault traveling wave collecting system disclosed by the invention can utilize the multi-port traveling wave distance measuring method in the medium voltage distribution network, the problem of extremely complicated network of the power distribution network is solved, and the distance measuring precision of the traveling wave is greatly improved.

Description

technical field [0001] The invention relates to a fault traveling wave acquisition device for a medium-voltage distribution network, and also relates to a fault traveling wave acquisition system using the fault traveling wave acquisition device. Background technique [0002] With the continuous expansion of the capacity and grid area of ​​major power systems in my country, the operation and management of medium-voltage distribution networks have become more complex, and the security and stability of medium-voltage distribution network power systems have become increasingly prominent. After the distribution line fails, quickly and accurately determine the fault location, which can not only reduce the burden of line inspection, repair the line in time, ensure reliable power supply, but also reduce the comprehensive economic loss caused by power outages. Therefore, fast and accurate fault location is of great significance to the safe, stable and economical operation of distribu...

AI Technical Summary

Problems solved by technology

[0003] The traveling wave method realizes the fault location of the transmission line according to the traveling wave transmission theory. The integrity of the fault traveling wave has a significant impact on the accuracy of the fault location, and the too low sampling rate of the traveling wave cannot reflect the traveling wave information well. Affects the ranging accuracy, and the high sampling rate generates a large amount of data during multi-channel acquisition, processing and transmission are both problems, so the existing faulty traveling wave acquisition devices often have high integrity and high precision of traveling wave signals The contradiction between the need for collection and the large amount of data collected at high speed

[0004] Moreover, currently traveling wave ranging devices are generally used for high-voltage transmission lines, not suitable for medium-voltage distribution networks with complex networks, and their ranging principles are only based on single-ended and double-ended methods. For the measurement of traveling wave signals, There are still flaws in precision and ultra-high-speed recording

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