Processing method for wiring error of differential protection CT return circuit of autotransformer
An autotransformer and differential protection technology, which is applied in the field of wiring error judgment and processing, can solve the problems of CT circuit wiring error judgment, low manual operation efficiency, poor reliability, etc., to improve accuracy and simplify the secondary circuit Wiring, the effect of eliminating electrical connections
Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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[0021] The invention provides a power system autotransformer differential protection CT circuit wiring error judgment and processing method, which solves the problems of random operation, poor reliability, low manual operation efficiency, time-consuming and labor-intensive problems in the prior art
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[0031] The error judgment method is as follows:
[0032] Compare the corrected current value with the original value saved in step 3 phase by phase, and judge the phase angles of A', B', C' and the original values A, B, C, -A, -B, -C According to the phase angle relationship, the conclusion of each winding and each phase is output. Here A, B, C represent the original value, -A represents A plus 180°, -B, -C are the same; A', B', C' represent the corrected value. Take the self-coupling three-turn transformation as an example: the corrected current value is the corrected current value of the high, medium and low voltage sides of the vertical differential and the public winding in the homodyne.
[0033] The conclusion is as follows. The intersecting grids in the table indicate that the values of the horizontal and vertical rows are equal. If the corrected value A' of a certain winding is equal to -A, then the polarity of phase A of this winding is reversed, and the results ...
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The invention provides a processing method for the wiring error of a differential protection current transformer (CT) return circuit of an autotransformer in an electric power system, which solves the problems of random operation, poor reliability, low work efficiency of manual operation, time and labor waste and the like in the prior art. The method comprises the following steps of: acquiring a measuring value and a transformer parameter; performing current conversion; correcting the correctness of longitudinal difference for the first time and judging the corrected longitudinal difference; correcting the correctness of the longitudinal difference for the second time and judging the corrected longitudinal difference; calculating each winding current in zero difference; correcting the correctness of the zero difference for the first time and judging the corrected zero difference; correcting the correctness of the zero difference for the second time and judging the corrected zero difference; and outputting a conclusion. The secondary load of a CT is reduced, so the method has the advantages of high reliability and the like and is easy to operate.
Description
technical field [0001] The invention relates to a wiring analysis method of a relay protection circuit in a power system, in particular to a method for judging and processing the wiring error of an autotransformer differential protection circuit in the power system. Background technique [0002] The autotransformer has longitudinal differential protection and homodyne protection. Taking the three-turn autotransformer as an example, it is necessary to analyze the longitudinal differential protection to judge the correctness of the high, medium and low voltage side wiring, and then analyze the homodyne protection. To judge the correctness of the wiring of the common winding. [0003] retrieve data. [0004] Obtain the current amplitude and phase data of each phase of the protection line. It is generally obtained by means of electrical measuring equipment. For the three-turn variable autotransformer, measure the current amplitude and phase of each phase of the high, medium a...
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IPC IPC(8): G01R31/02
Inventor 穆明建
Owner 西安爱邦电气有限公司