A loop network unit and a double loop network type distribution network

Abstract

The invention relates to a ring network unit and a double-ring network type distribution network, comprising a plurality of spacing units; Each spacing unit correspondingly comprises a ring incoming line, a ring outgoing line or a feeder line, each spacing unit further comprises a spacing DTU and a current transformer arranged on the ring incoming line, the ring outgoing line or the feeder line corresponding to the spacing unit; The interval DTU is connected with a current transformer in the same interval unit and also connected with an actuator in the same interval unit. A loop network structure of a distribution network is divide into loop intervals, loop-out interval, feeder interval, by use of the Plug and Play, Based on the distributed DTU and optical fiber differential protection function of primary and secondary fusion, the fast cut-off and overcurrent protection function can realize the fault isolation of distribution network without relying on the master station, and avoid thetraditional fault isolation overstep trip problem of distribution network and the switch life shortening and impact problem caused by multiple closing switches.

Description

technical field [0001] The invention relates to a ring network unit and a double-ring network type distribution network, belonging to the field of relay protection of power system distribution networks. Background technique [0002] The medium-voltage distribution network is a connecting link between the high-voltage and low-voltage distribution networks. For a long time, the effective management and specific analysis of its own grid structure and power supply reliability have often been ignored. At present, the typical wiring methods of domestic medium-voltage cable networks mainly include single-injection, double-injection, single-ring, double-ring, N supply and one backup and other types. Compared with developed countries such as Japan, France, and Singapore, there is still a big gap between the level of distribution network power supply reliability indicators. [0003] At present, domestic distribution network feeder automation mainly includes local and centralized meth...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a ring network unit and a double-ring network distribution network, which are used to solve the problems of complex logic and difficult operation and maintenance in the existing ring network unit when implementing fault isolation and switching power supply

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