Single-phase earth fault positioning system for power distribution overhead cable mixed line

Abstract

The invention relates to a single-phase earth fault positioning system for a power distribution overhead cable mixed line. The system comprises a low-current line selection device; the low-current line selection device comprises a voltage assembly for obtaining three-phase voltage or zero-sequence voltage and a current assembly for obtaining three-phase current or zero-sequence current; the low-current line selection device also comprises a voltage transformation module, a zero-sequence current acquisition module, a current / voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module. The system further comprises a positioning device, the positioning device comprises a voltage assembly for acquiring three-phase voltage or zero-sequence voltage, a current assembly for acquiring three-phase current or zero-sequence current, a voltage transformation module, a zero-sequence current acquisition module, a current / voltage conversion module, an analog-to-digital conversion module, a data processing module, a controller module, a power supply module and a wireless communication module. The system also comprises a background management host. Thus, the accuracy and the rapidity of one-way earth fault positioning of the distribution line are improved.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution fault detection, and in particular relates to a single-phase ground fault location system for power distribution overhead cable hybrid lines. Background technique [0002] The distribution network usually refers to the power grid with a voltage level of 110KV and below, which is responsible for directly supplying power to users in the power system. The reliability of distribution network power supply directly affects the safety and economy of users' electricity consumption. According to statistics, more than 95% of power outages suffered by power users are caused by power distribution systems, and about half of power system losses occur in distribution networks. In recent years, with the development of the national economy, the power load has increased significantly. In some areas, power rationing and frequent faults have occurred due to the fact that the construction ...

AI Technical Summary

Problems solved by technology

However, there are many methods of fault location, and the location results are different. Therefore, it is necessary to study the method of fault handling performance test of distribution network to ensure the accuracy of fault location, not only to ensure the safety, stability and economic operation of the power grid, Moreover, it is helpful for the popularization and use of new energy technology in the power system, can improve the social and economic benefits of the power supply department and users, and is of great significance to the safe production of the power system.

Images