Networking bus bar protecting method based on GOOSE mode

Abstract

The invention relates to a novel method for protecting a bus with voltage level of 35 kV and below 35 kV. The bus protection is performed by all measurement and control devices for outgoing line protection on the relevant bus segment, measurement and control devices of section breaker protection and measurement and control devices of incoming line protection (comprising interface units at the low-voltage side of the transformer). The method is characterized in that when a failure happens to the electric grid, the flow direction of the failure current can be judged by the dispersed protection units (measurement and control devices) so as to detect whether the failure happens to the bus. The interlocking trip information adopts GOOSE signals in accordance with the IEC61850 standard. The switching quantity is transmitted by adopting GOOSE channels. The collected analog quantity is transmitted by adopting an SMV service message in accordance with the IEC61850 standard. The method can be directly applied into the digital substations which are built based on the IEC61850 standard.

Description

technical field [0001] The invention belongs to the field of relay protection automation in the field of electric power engineering, and in particular relates to a new method for busbar protection with a voltage level of 35kV and below. Background technique [0002] In the power system, the busbars with a voltage level of 35kV and below are generally not equipped with special busbar protection because there is no stability problem. However, due to the many outlets of the 35kV and below voltage level system of the high-voltage substation, frequent operations, easy to be harmed by small animals, equipment insulation aging and mechanical wear and other reasons, there are still cases of bus failures. Bus faults at voltage levels of 35kV and below must be removed by the backup protection on the low-voltage side of the main transformer. The disadvantage of this design is that once a bus short-circuit fault occurs, the fault cannot be removed quickly, but the backup protection can ...

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Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a new method of busbar protection with a voltage level of 35kV and below, which overcomes the lack of protection of the busbar with a voltage level of 35kV and below and the traditional protection scheme collection and control cables, which cannot be directly applied to digital substation construction. In order to achieve the purpose of quickly removing busbar faults at voltage levels of 35kV and below in relay protection

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