A kind of busbar protection ta saturation blocking and re-opening control method and system

Abstract

The invention relates to a bus protection TA saturation locking and reopening control method and system. The method comprises the following steps: obtaining current data collected by a current transformer TA of each branch connected with a bus, and determining whether bus differential protection is started according to the current data; after bus differential protection is started, calculating whether an SDP corresponding to each current transformer TA acts according to the data collected by the current transformer TA; if the SDP of any branch acts, determining that the current transformer TAcorresponding to the branch is saturated, and locking bus differential protection; and determining whether the bus has a conversion fault according to the action of the SDPs in a second data window, and controlling whether bus differential protection is reopened according to whether the bus has a conversion fault. By using the judgment method of the invention, whether a current transformer is saturated can be identified quickly and effectively, and bus protection can be locked quickly and reliably under the condition of an external fault and saturation. Under the condition of an internal faultand a conversion fault, bus protection can also act reliably. The action reliability of bus protection is improved.

Description

technical field [0001] The present invention relates to the technical field of electric power protection, in particular to a bus protection TA saturation blocking and re-opening control method and system. Background technique [0002] The busbar is an important hub in the power transmission and distribution system. Once a fault occurs, it will affect the stable operation of other electrical equipment connected to the busbar and cause a large-scale power outage. Therefore, it is extremely important to ensure the safe and stable operation of the busbar. At present, most of the microcomputer busbar protection still adopts the current differential principle as its main protection, and the current used in the differential protection criterion is collected by the current transformer TA (TA). When the actual power grid is running, compared with primary equipment such as lines and transformers, the number of bus failures is much less. However, when the line or transformer fails, th...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a busbar protection TA saturation blocking and re-opening control method and system for the above-mentioned deficiencies in the prior art, which are used to solve the extremely fast saturation of TA caused by the near-end fault outside the busbar area and cause The problem of misoperation of busbar protection

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