Low-voltage transformer area short-circuit fault positioning system and method based on HPLC (High Performance Liquid Chromatography) communication

Abstract

The invention relates to a low-voltage transformer area short-circuit fault positioning system based on HPLC communication. The system comprises a CCO central coordination unit installed at the highest level of a low-voltage transformer area and STA terminal units installed at branches of all levels of the low-voltage transformer area. The CCO central coordination unit comprises a first control module, and an operation module, a first HPLC communication module and a first power supply module which are electrically connected with the first control module; the first HPLC communication module is also electrically connected with a low-voltage power line; the STA terminal unit comprises a second control module, and a short-circuit fault detection module, a second HPLC communication module and a second power supply module which are electrically connected with the second control module; the short-circuit fault detection module is used for detecting the current of the branch, converting the current into a voltage signal and transmitting the voltage signal to the second control module, and the second control module judges whether the branch has a short-circuit fault according to the collected current characteristics; and the CCO central coordination unit performs data interaction with each STA terminal unit through the HPLC communication module.

Description

technical field [0001] The invention relates to a system and method for locating short-circuit faults in a low-voltage station area based on HPLC communication, and belongs to the technical field of short-circuit fault locating in power systems. Background technique [0002] With the increasing social demand for electricity and the continuous expansion of the power grid, the short-circuit fault in the low-voltage station area not only directly affects the power quality of power users, but also seriously affects the safe and stable operation of the distribution network. To this end, in recent years, my country has invested heavily in large-scale transformation of the low-voltage distribution network. Through the upgrading and transformation of the low-voltage distribution network, not only the structure of my country's urban and rural power grids has been changed, but also the equipment performance of the low-voltage distribution network has been greatly improved. The improv...

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Problems solved by technology

Due to the intricate topological structure of low-voltage station areas in most parts of the country, when a short-circuit fault occurs, the traditional method is: the power user reports the circuit fault, and then the inspection and maintenance personnel check the fault point on site. This method not only has high work intensity and high work efficiency. At the same time, when a large-scale, multiple short-circuit fault occurs, the workload of the inspection and maintenance personnel will become very large

With the construction of new power systems, technologies such as CAN bus, GPRS, and Zigbee are gradually applied to low-voltage short-circuit fault location, providing a new solution for short-circuit fault location, but due to the need for external lines, high traffic costs, and transmission communication Disadvantages such as low speed and short distance make these new technologies still unable to be popularized in most low-voltage station areas in China

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