Method for realizing differential protection CT (Current Transformer) loop wiring analysis of exciting transformer
A technology of excitation transformer and differential protection, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of high requirements for staff, time-consuming and laborious judgment, etc., and achieve lower technical level requirements, higher accuracy, and strong reliability Effect
Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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[0010] 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 excitation transformer differential protection under manual conditions, and the situation of high requirements for the staff is high, the present invention provides an excitation transformer differential protection with high reliability, safe and simple use, and convenient operation. The Analysis and Judgment Method of Whether the Connection of Protection CT Circuit Is Correct or Not
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[0061] The present invention provides a method for analyzing whether the CT loop wiring of the excitation transformer differential protection is correct or not. The specific flow of the wiring analysis is as follows:
[0062] 1. Obtain the judgment basis for judging whether the protection CT circuit wiring is correct or not:
[0063] Obtain the active power and reactive power transmission and reception of this circuit by measuring the circuit, metering point or the substation connected with it, and determine the secondary of this equipment unit according to the active power and reactive power transmission and reception of this circuit, the effective value of the primary current, etc. For the correct phase angle and the effective value of the current, a reference voltage needs to be selected during measurement, and the measured current phase refers to the phase of the measured current relative to the reference voltage. The reference voltage can be selected by the operator durin...
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The invention relates to a method for realizing differential protection CT (Current Transformer) loop wiring analysis of an exciting transformer. The method comprises the following steps of: (1) drawing a correct vector diagram of the loop; (2) drawing an actually measured vector diagram through reference voltage; (3) outputting a wiring correctness analysis result of the loop; (4) finishing the measurements and the judgments of the wiring correctness of all conjunction units; (5) drawing vector diagrams of options of the CT at various sides of the differential protection loop of the exciting transformer through the reference voltage by adopting a method of simultaneously measuring identical phases at various sides, and converting the measurement value of the differential protection CT loop according to the exciting transformer and parameters thereof; and (6) analyzing and judging the conjunction analysis result; outputting the analysis result, and if the conjunction analysis result is incorrect, checking the lead-out polarization and change of the CT according to the analysis result, and if the conjunction analysis result is correct, outputting the conjunction correctness analysis result of the exciting transformer. The method has the advantages of reliable analysis result and greatly-improved accuracy.
Description
technical field [0001] The invention relates to a method for analyzing the correctness of the wiring of the relay protection CT circuit in a power system, in particular to a method for analyzing and judging whether the wiring of the CT circuit of the differential protection of the excitation transformer in the power system is correct and whether the phase combination is correct and giving Analysis method of wrong wiring type. 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 excitation transformer differential pro...
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Inventor 穆明建
Owner 西安爱邦电气有限公司