Relay Protection System of Sequential Acceleration Action in Distribution Network

Abstract

The invention relates to a relay protection system of an electric distribution network longitudinal zero-sequence acceleration action. The relay protection system comprises an electric distribution network station with double power supplies, wherein all first bus outlet protection devices and all second bus outlet protection devices are connected with a section switch protection device; the section switch protection device is connected with a section current transformer and a section switch; section bus three-phase current on a section bus is obtained through the section current transformer; if at least one phase in the section bus three-phase current exceeds a section bus longitudinal zero-sequence protection current setting value preset in the section switch protection device, the section switch protection device performs timing; after the section longitudinal zero-sequence action long time limit tZXL, the section switch protection device controls the section switch to be in a switch-off state. The relay protection system has the advantages that the structure is compact; the inside fault main protection action time of the electric distribution network station is effectively shortened; the problem of electric distribution network and main network relay protection setting time matching difficulty is solved.

Description

technical field [0001] The invention relates to a relay protection system, in particular to a relay protection system for a longitudinal sequence acceleration action of a distribution network, which belongs to the technical field of relay protection of electric power systems. Background technique [0002] In order to reliably and selectively remove faults, power distribution stations are usually equipped with multiple relay protection devices. Such as figure 1 As shown, it is a typical protection device for an existing power distribution network, specifically, it includes a first incoming line 1, a first bus bar 9 connected to the first incoming line 1, a second incoming line 2, and a connection with the second incoming line. The second bus bar 10 connected by the line 2, the first bus bar 9 and the second bus bar 10 are connected by a segmented bus bar 11 . The first incoming line current transformer 3 and the first incoming line switch 4 are arranged on the first incomin...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a relay protection system for distribution network longitudinal acceleration action, which has a compact structure, effectively shortens the main protection action time for internal faults in power distribution stations, and solves the problem of Difficulty in coordinating the setting time of the relay protection of the grid and the main grid

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