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Method for correcting longitudinal difference of two-winding auto-transformer and judging corrected longitudinal difference

An autotransformer, correctness technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of high cost and complex judgment methods, and achieve the effects of improved accuracy, convenient operation and strong reliability

Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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Problems solved by technology

[0006] The present invention provides a method for correctness correction of the longitudinal difference of a two-winding autotransformer and a post-correction judging method, which mainly solves the problems of complex and high-cost correction and post-correction judging methods of the existing two-winding autotransformer longitudinal difference

Method used

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Embodiment Construction

[0013] The first correctness correction of longitudinal difference and the judgment after correction: the first is to judge whether the wiring is correct without any correction. In this step, if the following three conditions are met, it means that the phase is balanced, then it proves that the wiring is correct, and jump directly to step 5 for homodyne analysis; if not, it proves that the wiring is wrong, so the converted current value needs to be saved first A copy is used as the original value (for outputting results), and then enters the next step; in this step, the vertical difference is judged according to the following conditions.

[0014] Condition 1, the phase sequence of all windings with longitudinal difference is the same and positive sequence, that is, it is displayed as A, B, C in the clockwise order in the vector diagram; condition 2, all windings with longitudinal difference satisfy the phase angle balance, that is, the phase difference between phases 120°; con...

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Abstract

The invention relates to a method for correcting longitudinal difference of a two-winding auto-transformer and judging the corrected longitudinal difference. The method comprises the following steps of: judging whether wiring is correct before correcting is carried out, if the three conditions (described in the specification) are met, namely the phase is balanced, the wiring is correct, otherwise the wiring is incorrect, firstly saving a copy of a converted current value as an original value (used for outputting result), and then executing the next step; judging the longitudinal difference according to the conditions (described in the specification), if the correctness conditions can not be met, correcting the contents (described in the specification), and then judging whether the wiring is correct; correcting a reference winding; correcting phase angle balance; and correcting phase angle positive sequence.

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 correctness correction of the longitudinal difference of a two-winding autotransformer in the power system and a judging method after correction. 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. Obtain data: 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/06
Inventor 穆明建
Owner 西安爱邦电气有限公司
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