Bus differential protection method for realizing sectional dead zone protection based on virtual bus

Abstract

The invention relates to a bus differential protection method for realizing sectional dead zone protection based on a virtual bus. The bus differential protection method comprises the following steps: independently arranging a bus differential protection device for each section of bus in a plurality of single bus sections; virtualizing the corresponding bus according to the position and the quantity of sectional switches connected with each section of bus; after the current equivalence of each sectional switch is taken, calculating into a side bus differential protection device logic; and when a dead zone in a sectional switch generation zone fails, jumping the sectional switch at the side and then sending out a command to jump a virtual bus sectional switch or borrowing a bus differential protection exit loop of a virtual bus self. The bus differential protection method has the benefits that due to the arrangement of the virtual bus, when the dead zone in the generation zone fails, a CT signal is not required to be alternately sealed by a side bus differential protection device and an opposite side bus differential protection device; the protection function of dead zone failure of the sectional switches is realized inside the side bus differential protection device through the virtual bus; and an external signal is not required to be connected, so that a connecting line between the side bus differential protection device and the opposite side bus differential protection device is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and relates to a bus differential protection method for realizing segmented dead zone protection based on a virtual bus under the condition that the bus differential protection is configured according to the bus bar in a single bus multi-section wiring mode. Background technique [0002] With the development of the power system, the number of low-voltage load outlets in the terminal substation is increasing, and the single-bus multi-section wiring method is generally used; however, bus protection is limited by hardware resources (current loops), and cannot be implemented in a set of protection devices. Complete current differential protection for the entire busbar. At present, the general method is to configure a set of busbar protection for each section of the busbar. For the current of the section circuit breaker, it needs to be connected to two sets of busbar pro...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bus differential protection method based on a virtual bus to realize subsection dead zone protection, so as to solve the problem caused by exchanging CT signals between two sets of bus protection devices in the existing method

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