Automatic control device for differential distribution network

Abstract

The utility model relates to an automatic control device of differential distribution network, comprising three current transformers of phase A, B, and C arranged in the lines of the distribution power network, and two sectional switches arranged on both sides of the section of the lines. The utility model also comprises a fault current collector, an address encoder, an address decoder, a carrier frequency device, a differential comparison and identification unit, and a motor carrier power supply unit. The current transformers of phase A and C are connected with the collector of faulting current, and the current transformer of phase B is connected with the motor carrier power supply unit which is connected with a trip coil of the sectional switch. Besides, the carrier frequency device is connected with the address encoder and the address decoder, and the fault current collector is connected with the differential comparison and identification unit which is connected with the trip coil of the sectional switch. The utility model has the advantages that: due to adopting the differential device to position the working section in a long distance, the faulting section can be identified quickly, the action number of the switch can be reduced, the power can be resupplied soon, and the impact caused by short circuit to the power network can be avoided.

Description

(1) Technical field [0001] The invention belongs to distribution network automation equipment, in particular to a distribution network automation control device. (2) Background technology [0002] The failure probability of overhead lines is relatively high. The modern distribution network system uses segment switches (load switches) to divide long lines into multiple line segments for operation. In the blackout area, improve the reliability of the power supply of the distribution network system. [0003] In order to improve the reliability of the power supply of the 10kV overhead distribution network system, my country has adopted distribution network automation equipment technology since the late 1980s, and introduced and developed various types of high-voltage electrical equipment and control devices such as reclosers and sectionalizers. . The purpose of automatic control technology of feeder lines in distribution network system is to quickly identify line faults and iso...

AI Technical Summary

Problems solved by technology

In order to overcome the existing distribution network automation device when looking for the fault location of the distribution network line, the switching appliances have frequent actions, the number of repeated power failures, the restoration of power supply time is too long, the reliability is not high, and the service life of the switching appliances is reduced. Insufficient to bring unnecessary short-circuit impact, the present invention provides a differential principle that adopts the differential principle to locate the section, can quickly lock the faulty section, reduce the number of actions of switching appliances, quickly restore power supply, and avoid short-circuit impact on the power grid. Dynamic distribution network automation control device

Images