A busbar differential protection method and device for busbar ct abnormality
A busbar differential protection and bus coupling technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as loss of selectivity
Active Publication Date: 2019-03-19
XUJI GRP +3
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[0005] The purpose of the present invention is to provide a bus differential protection method and device for abnormal bus coupler CT, which is used to solve the problem of simultaneous removal of faulty bus and non-faulty bus due to abnormal bus coupler CT, that is, loss of selectivity
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[0026] The above steps will be described in detail below with reference to the accompanying drawings.
[0027] The present invention proposes a busbar differential protection method for busbar CT abnormality, the principle flow is as follows figure 2 As shown, the steps are as follows:
[0028] Step 1, judge whether the bus coupler CT is abnormal;
[0029] Step 2, if the large difference of the busbar determines the fault in the busbar area, determine the busbar protection mode according to the abnormal judgment of the busbar CT; among them, if there is no abnormality in the busbar CT, directly run the small difference discrimination of each section of the busbar, and select the faulty busbar to trip; In the case of abnormality of the connected CT, disconnect the bus tie circuit breaker first, and then judge the small difference of each section of the bus, and select the faulty bus to trip.
[0030] For step 1, its purpose is to determine whether the bus tie CT is abnormal,...
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The invention relates to a busbar differential protection method and apparatus for busbar tie CT (current transformer) anomalies. The method includes the following steps that: whether a bus-bar tie CT is abnormal is judged; and if a busbar large-differential protection unit judges that a busbar region-within fault occurs, a busbar protection method is determined according to the abnormal condition of the busbar tie CT, if the busbar tie CT is abnormal, a busbar tie circuit breaker on which a CT anomaly occurs is cut off instantly by means of the protection action of the busbar large-differential protection unit, after the busbar tie circuit breaker is switched off, busbar small-differential protection units accurately select a fault busbar. The apparatus includes a unit for judging whether the bus-bar tie CT is abnormal and a unit for determining the busbar protection method. With the busbar differential protection method and apparatus for bus-bar tie CT anomalies adopted, a fault busbar and a non-fault busbar can be fast distinguished; a fault can be isolated in a time range allowed by the stability of a system; a condition that the busbar small-differential protection units switch off the non-fault busbar when a busbar region-within fault occurs after a bus-bar tie CT anomaly can be avoided; load loss can be decreased; and the reliability of power supply can be ensured.
Description
technical field [0001] The invention relates to a busbar differential protection method and device for busbar CT abnormalities, belonging to the technical field of relay protection for power systems. Background technique [0002] As the grid structure is getting tighter, the stable operation of the grid is particularly important. The system busbar below 220kV generally adopts double busbar (including double busbar double branch and double busbar single branch) wiring, such as figure 1 As shown, the I mother and the II mother are connected through the bus tie circuit breaker, and the I mother and the II mother are connected to the power supply interval through the corresponding circuit breaker. The biggest technical feature of the double-bus connection mode is its high operating flexibility. When one section of the bus is overhauled or fails, the other section of the bus can be used to continue power supply. After any section of the bus is out of operation, the reliability o...
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IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 王智勇肖锋黄继东胡沙沙冯广杰龚赟朱军红王志伟李书圣杨宁张延海唐宇耿继伟周栓柱
Owner XUJI GRP