Method for analyzing wiring correctness of double-winding conventional transformer single-switch differential protection CT

A technology of differential protection and analysis method, which is applied in the direction of emergency protection circuit devices, instruments, and measurement of electrical variables, etc., which can solve problems such as low work efficiency, large amount of data calculation, random operation, etc., and achieve accuracy improvement and reliability strong effect

Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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AI Technical Summary

Problems solved by technology

[0006] Operators must be familiar with the theoretical knowledge of the power system and have rich practical experience in order to judge whether the relay protection CT circuit wiring is correct, and then analyze where the error is and how to correct it; the traditional relay protection line wiring analysis is manual method, there are the following disadvantages or deficiencies: high work complexity, low work efficiency; especially in the process of analyzing and judging the differential CT circuit of the main transformer, the amount

Method used

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Embodiment Construction

[0015] The method includes the following steps:

[0016] 1) Obtain the correct instantaneous active and reactive power transmission and reception conditions of this circuit according to methods such as measurement circuit or bus power balance calculation;

[0017] 2) According to the transmission and reception of instantaneous active and reactive power, generally the correct phase angle is automatically calculated with Ua as the reference voltage;

[0018] 3) Obtain the correct vector relationship (usually clockwise and positive sequence) according to the calculated correct phase angle;

[0019] 4) Actual measurement of the phase angles of phases A, B, and C of the CT circuit protected by this circuit. Since there is an error between the measured phase angle and the phase angle calculated according to the measurement circuit, we consider the actual protection of the phases A, B, and C of the CT circuit. The phase angle should be subtracted from the phase angle calculated acco...

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Abstract

The invention relates to a method for analyzing the wiring correctness of a double-winding conventional transformer single-switch differential protection current transformer (CT), in particular to an analysis method for analyzing and judging whether the wiring of the CT of a double-winding conventional transformer single-switch differential protection circuit in an electric system is correct or not, and giving an error position and an error type. In order to solve the problems that the wiring error condition of a relay protection circuit is artificially judged in a time-consuming and labor-consuming mode, and the requirement on working personnel is high at present, the invention provides a method for analyzing the wiring of the conventional transformer differential protection circuit of the electric relay protection circuit, which has high judgment analysis reliability and is safely and simply used and convenient to operate.

Description

technical field [0001] The invention relates to a method for analyzing the correctness of the CT wiring of a two-winding conventional transformer multi-single-switch differential protection CT, that is, a method for analyzing whether the wiring of a current transformer CT of a two-winding conventional transformer single-switch differential protection circuit in a power system is correct Judge and give the analysis method of error location and error type. Background technique [0002] For the wiring of a single CT circuit, it is necessary to make it meet the phase-to-phase difference of 120°, both are positive sequence or negative sequence, the phase sequence is the same, and the secondary value of the current of each phase is the same. The primary current value calculated by multiplying the current effective value of the secondary measurement by the CT transformation ratio is the same as the primary current value of the measurement circuit. When the wiring is wrong, the cor...

Claims

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Application Information

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IPC IPC(8): G01R31/02H02H7/045
Inventor 穆明建
Owner 西安爱邦电气有限公司
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