A distribution line fault location system

Abstract

The invention relates to a fault locating system for a power supply circuit. A lightning sampling ring is connected with a rectifying amplitude limiting circuit; the rectifying amplitude limiting circuit is connected with a charge storing and releasing circuit; the charge storing and releasing circuit is connected with an MCU (Microprogrammed Control Unit); leakage current is connected with a leakage current sensor; the leakage current sensor is connected with an impedance matching circuit; the output end of the impedance matching circuit is connected with a large-current amplitude limiting circuit and a small-current amplitude limiting circuit respectively; the large-current amplitude limiting circuit and the small-current amplitude limiting circuit are connected with the MCU respectively; the MCU is connected with a GPRS / GSM (General Packet Radio Service / Global System For Mobile) communication module. Through adoption of the fault locating system for the power supply circuit, a large amount of data processing is avoided, responses are only made to leakage current surpassing a pre-warning value and lightening pulse current, the data process load of a central expert system is small, and the accuracy is high. Moreover, a fault point can be located accurately in time in combination with a GSM system and an MIS (Management Information System) system, the cost is low, and the practicability is high.

Description

technical field [0001] The invention relates to the field of distribution network fault location in power systems, in particular to a distribution line fault location system. Background technique [0002] At present, the total distribution of the global power grid continues to increase, and the problem of pollution flashover is becoming more and more serious. With the development of urban and rural industries and agriculture in my country, the pollution of power distribution lines is increasing year by year, and the level of distribution voltage is constantly increasing, and the scope of power grids is becoming wider and wider. The update of system equipment is not in place, the level of automation is low, the air pollution is aggravated, and the dirt layer deposited on the surface of the insulator will reduce the external insulation capacity of the insulator after it gets wet. The pollution flashover accidents continue every year, which seriously threatens the safe operation ...

AI Technical Summary

Problems solved by technology

At present, the salt density measurement of insulators is mostly used in China to guide line cleaning, but the large number of distribution line towers, wide distribution, and complex geographical conditions make the salt density measurement workload heavy, unable to continuously monitor, and cannot be reflected in different climates and environmental conditions in a timely manner. Insulation performance status of insulator surface

In recent years, there have been many researches on online monitoring of high-voltage insulators in China. Both domestic and foreign online monitoring of high-voltage insulators are based on the global mobile communication network, a detection method that combines sensor technology, communication technology and computer technology. Researchers Through the real-time monitoring of insulators, the pollution and aging status of insulators can be grasped, and the correct prediction and evaluation can be made through the central expert system to realize fault warning. However, the system has the following deficiencies: (1) The monitoring data needs to be integrated with the environmental conditions Analysis requires real-time monitoring of data such as environmental temperature and clothing, humidity, and wind speed. The amount of data collected is large, the central data processing system is complex, and data errors are large, often misjudgment; Map manual positioning ie; (3) high cost, high cost of wireless transmission system

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