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Method for judging correct wiring of differential protection of conventional three-winding transformer

A technology of differential protection and judgment method, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of time-consuming and labor-intensive relay protection lines, and high requirements for staff, simplifying the wiring analysis work and reducing the technical level requirements. , the effect of simple operation

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

[0021] In order to solve the situation that it is time-consuming and labor-intensive to judge the wrong connection of the relay protection line under manual conditions, and has high requirements for the staff, the present invention provides a method for judging the correct connection of the differential protection line of the three-winding conventional transformer, and Wiring analysis method giving error location and error type

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  • Method for judging correct wiring of differential protection of conventional three-winding transformer
  • Method for judging correct wiring of differential protection of conventional three-winding transformer

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Embodiment Construction

[0049] The calculation method for the balance factor of the conventional transformer differential protection in the above step 2.2) is:

[0050] 2.2.1.1) Calculate the secondary rated current of each winding;

[0051] Formula one:

[0052] According to the formula one has:

[0053] Then there is the second formula:

[0054] Among them, S is the capacity of the transformer;

[0055] U is the rated voltage of the winding primary side;

[0056] I is the rated current of the winding primary side;

[0057] Ie is the secondary rated current of the winding;

[0058] Nct is the winding CT ratio.

[0059] Calculate the secondary rated current of each winding according to the above formula 2.

[0060] 2.2.1.2) Set the balance coefficient of the item with the largest rated current of each winding as 1, and convert the balance coefficients of other windings;

[0061] 2.2.1.3) The balance coefficient should be less than or equal to 4. If there is a balance coefficient greater t...

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Abstract

The invention provides a method for judging correct wiring of a differential protection circuit of the conventional three-winding transformer, and provides a wiring analytical method for error positions and error types. In the method for analyzing the wiring of a relay protection circuit of the conventional three-winding transformer in an electric power system, the wiring is corrected and judged twice, and a perfect error condition and a correcting scheme are provided in the final analytical result without being judged artificially; and in the judging method, the analytical result has the reliability obviously superior to that of the conventional analytical method, and is not influenced by aspects of subjective quality of operators, objective environmental factors and the like, so the accuracy of the analytical result is improved substantially.

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 the correct wiring of a three-winding conventional transformer (abbreviated as a conventional transformer) differential protection circuit in the power system. Background technique [0002] For the three-winding conventional transformer differential protection, it is necessary to calculate the resultant vector of each phase on the power supply side and the resultant vector of each phase on the load side. When each winding satisfies the phase angle balance, that is, the difference between phases and phases is 120 angstroms. Take 13. Embed recognition? 80 concave pure meal unloading unitary reaction [0003] It can be concluded that the conditions for correct wiring are: [0004] 1) The vector sum of the composite vector on the power supply side and the composite vector on the load side is zero (that is, the amplit...

Claims

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Application Information

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