Standby automatic switching system and its operation method for self-adaptive switching in medium resistance grounding mode

Abstract

The invention discloses a spare power automatic switching system with a self-adaptive switching intermediate resistance grounding mode, and an operation method thereof. The spare power automatic switching system comprises a spare power automatic switching device which is applied to a 10 KV transformer substation system with the intermediate resistance grounding mode, wherein the 10 KV transformer substation system adopts an external bridge expansion wiring mode, a 110 KV side is provided with three bus bars connected through buscouple switches, and the 10 KV side is provided with four sections of bus bars with three grounding transformers respectively. The spare power automatic switching device comprises an analog input end, trip position contacts and input amount contacts of bus bar intermediate resistance switching-in pressing plates, wherein the analog input end is connected into voltage and currents of the four sections of bus bars on the 10 KV side; the trip position contacts are connected into all branch loop switches, buscouple switches and all intermediate resistance switches connected with all the buses on the 10 KV side. The 10 KV transformer substation system comprises contact on-off input ends of all locking spare power automatic switching switching-in amount aiming at spare protection of all main transformers and manual tripping acts of all switches. The spare power automatic switching system can achieve mutual switching of main power supplies and spare power supplies as well of self-adaptive switching of intermediate resistance grounding points by optimizing the structure and the operation logic of the spare power automatic switching system.

Description

technical field [0001] The invention relates to the technical field of automatic switching in power transmission and distribution equipment in power systems, and is especially suitable for substations with 10KV multi-section busbar connection mode using medium resistance grounding to realize remote self-switching functions of main and backup power supplies and grounding transformers Self-adaptive switching backup and automatic switching system and its operation method in medium resistance grounding mode. Background technique [0002] With the continuous development of the urban power grid, there are more and more cable lines in the urban transmission and distribution network, resulting in the increase of the capacitive current when the line ground fault occurs. In order to limit the ground current and quickly and accurately find the fault line, the The faulty equipment is removed from the power grid, and the neutral point is grounded through neutral resistance, which is more...

AI Technical Summary

Problems solved by technology

The existing 10KV standby automatic switching system is only suitable for grounding or non-grounding through the arc suppression coil, and cannot complete the main and standby power switch under the self-adaptive switching of the system grounding mode with grounding components such as grounding transformers

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