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Method for analyzing autotransformer differential protection CT circuit connection

An autotransformer and differential protection technology, applied in emergency protection circuit devices, phase angle between voltage and current, instruments, etc., can solve the problems of high staff requirements, time-consuming and laborious judgment, etc., and reduce the technical level requirements. , the effect of improving accuracy and avoiding errors in conjunction results

Active Publication Date: 2010-06-30
西安爱邦电子系统有限公司
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Problems solved by technology

[0022] In order to solve the situation that it is time-consuming and labor-intensive to judge the wiring error of the CT circuit of the power system relay protection under manual conditions, and the situation of high requirements for the staff is high, the present invention provides a power system relay with high reliability, safe and simple use, and convenient operation. Analysis and Judgment Method of Correct or Incorrect Wiring of Protective CT Circuit

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  • Method for analyzing autotransformer differential protection CT circuit connection
  • Method for analyzing autotransformer differential protection CT circuit connection
  • Method for analyzing autotransformer differential protection CT circuit connection

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Embodiment Construction

[0064] The present invention provides a method for analyzing whether the wiring of the relay protection CT circuit of a power system is correct or not. In order to facilitate understanding, the present invention takes the phase sequence as the positive sequence as an example to describe the wiring analysis method in detail, and the judgment and analysis of the negative sequence and the positive sequence The process is the same.

[0065] The specific process of wiring analysis is as follows:

[0066] 1) Obtain the parameters of each winding of the autotransformer differential protection circuit:

[0067] Obtain the active power and reactive power transmission and reception conditions of this circuit through the measurement circuit, metering point or the associated substation, according to the active power and reactive power transmission and reception conditions of this circuit, and the primary current RMS. A reference voltage needs to be selected during measurement, and the me...

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Abstract

The invention provides a method for analyzing autotransformer differential protection CT circuit connection. The method comprises the following steps of: (1) acquiring parameters of all windings in the autotransformer differential protection circuit; (2) measuring phases and amplitude values of phase currents of the windings in the autotransformer differential protection circuit; (3) calculating according to the acquired parameters to obtain the correct current phases of secondary circuits of the windings in the autotransformer differential protection circuit; (4) comparing to judge the correctness of the measured autotransformer differential protection circuit connection, and generating the corresponding connection status code; (5) outputting the result; and (6) synthesizing the primary windings and the secondary windings, and outputting the synthesis result. The invention has the advantages of high reliability, safe and simple use and convenient operation, and solves the technical problem of complex process for artificial judgment of connection correctness in the prior art.

Description

technical field [0001] The invention relates to a method for analyzing the correctness of the wiring of a CT circuit of relay protection in a power system, in particular to an analysis and judgment of the correct wiring of a CT circuit of an autotransformer differential protection in a power system, and provides an analysis of wiring errors method. Background technique [0002] For the correctness of single CT circuit wiring, it is necessary to meet the phase-to-phase difference of 120°, and the phase sequence is the same, both are positive sequence or negative sequence, 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. [0003] For the autotransformer differential protection CT circuit, in addition to satisfying the phase angle balance of each winding,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R25/00H02H7/045
Inventor 穆明建
Owner 西安爱邦电子系统有限公司
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