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Method for verifying correctness of transformer differential protection secondary connection loop

A technology of differential protection and secondary wiring, applied in instruments, measuring electrical variables, measuring devices, etc., can solve problems such as inability to verify current loops, and inability to simulate the operating state of differential protection.

Inactive Publication Date: 2010-12-08
江苏省电力公司泗洪县供电公司 +3
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  • Abstract
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  • Application Information

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Problems solved by technology

It can be seen that the current method has the following disadvantages: it cannot simulate the actual operating state of the differential protection, but only tests the connection status of the polarity secondary circuit of the CT; overall check

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  • Method for verifying correctness of transformer differential protection secondary connection loop
  • Method for verifying correctness of transformer differential protection secondary connection loop
  • Method for verifying correctness of transformer differential protection secondary connection loop

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Embodiment Construction

[0014] The accompanying drawings disclose a preferred embodiment of the present invention without limitation, and the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] The method for verifying the correctness of the transformer differential protection wiring in the present invention comprises the following steps: after the secondary wiring of the differential protection circuit of the main transformer is connected, first perform a three-phase short circuit on the low voltage side of the main transformer, and then perform a three-phase short circuit on the high voltage side of the main transformer. Apply a three-phase AC voltage of 100 to 500V on the side (the applied three-phase AC voltage value is determined by the site according to the main transformer capacity and the difference in the transformation ratio of the high and low side current transformers of the main transformer, as long as it can...

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Abstract

The invention discloses a method for verifying correctness of a transformer differential protection secondary connection loop, which comprises the following steps of: completing the secondary connection of a main transformer differential protection loop, carrying out three-phase short circuiting on a main transformer low-voltage side, applying a 100-500 V three-phase alternating-current voltage to a main transformer high-voltage side, judging whether the connection of a differential protection circuit is correct or not according to the result whether a differential current is generated in the main transformer differential protection loop, judging that the connection of the differential protection circuit is not correct when the differential current passes through the differential protection circuit, and judging that the connection of the differential protection circuit is correct when no differential current passes through the differential protection circuit. Therefore, by the invention, the real running condition of the transformer put into operation can be simulated, and the problem that a transformer is possibly paused to replace the connection of the secondary loop is avoided when the load test is carried out on the transformer differential protection to verify the correctness of the differential loop or the connection of the differential loop is incorrect after the transformer is put into operation.

Description

technical field [0001] The invention relates to a method for verifying the correctness of a secondary wiring circuit of a transformer differential protection. Background technique [0002] Whether the wiring of the transformer differential protection circuit is correct or not is an important prerequisite for the operation of differential protection. If the wiring of the differential protection circuit is not correct, when there is a fault in the main transformer area, the protection will not be able to operate, which may cause damage to the main transformer. The consequences are dire. [0003] At present, the verification method of the secondary circuit of the differential protection of the main transformer: Take the 35kV / 10kV two-turn transformation as an example, connect the CT (current transformer) with the same name on the high and low voltage sides of the main transformer to the same differential protection circuit. First connect the secondary circuit of the different...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/06
Inventor 秦辉王炜
Owner 江苏省电力公司泗洪县供电公司
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