Medium-voltage power distribution network fault monitoring device

Abstract

The invention discloses a medium-voltage power distribution network fault monitoring device. The medium-voltage power distribution network fault monitoring device comprises an information acquisition system and an information processing terminal, and also comprises an information processing terminal and / or a handheld terminal, wherein the information acquisition system comprises a zero sequence CT, a short circuit CT module, a zero sequence current monitoring module, a short circuit current monitoring module, a micro controller unit (MCU) and a first communication module. According to the medium-voltage power distribution network fault monitoring device, a zero sequence voltage transformer does not need to be connected in, a zero sequence current transformer is directly used for monitoring a single-phase grounding fault, zero sequence current can be calculated and processed by combining the information processing terminal, and a place where the fault occurs can be positioned. The device is low in cost, simple in implementation manner, accurate and convenient. Besides, power can be acquired directly from a power distribution cable without connecting another power supply unit, so that the device can operate stably and timely. The medium-voltage power distribution network fault monitoring device with the excellent performance can be widely applied to a medium-voltage power distribution network.

Description

technical field [0001] The invention relates to a fault monitoring device for a distribution network, in particular to a fault monitoring device for a medium-voltage distribution network. Background technique [0002] The medium-voltage distribution network is the capillary of the power system, and its total length is much longer than the aorta-high-voltage transmission line of the power system. Moreover, the medium voltage distribution network still has a large number of overhead transmission lines in the suburbs and outer suburbs of the city. These overhead transmission lines are often multi-branch lines with poor safety and reliability. In bad weather such as wind and rain, it is easy to generate single Phase-to-ground and short-circuit faults have seriously affected the safe and reliable power supply of the grid. Moreover, medium-voltage overhead lines are generally only equipped with overcurrent protection, quick-break protection, and reclosing protection for the line....

AI Technical Summary

Problems solved by technology

At present, most of the fault monitoring equipment used in the medium-voltage distribution network requires three-phase zero-sequence PT (voltage transformer) and zero-sequence CT (current transformer), and performs fault monitoring by obtaining the zero-sequence voltage and current when the fault occurs , this kind of fault monitoring equipment is not only costly, but also needs to be connected to some coils because of the connection of three-phase zero-sequence PT, which is easy to cause electromagnetic interference to the power grid

And the power supply of most fault monitoring equipment is powered by external power supply equipment, which makes many problems encountered in practical applications

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