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An inspection method for differential protection wiring of transformers

A technology of differential protection and inspection method, which is applied in the field of transformers, can solve problems such as transformer differential protection wiring construction, achieve the effect of avoiding casualties and economic losses, and solving technical problems of differential protection wiring construction

Active Publication Date: 2017-11-17
TIANJIN 20 CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides an inspection method for differential protection wiring of transformers. The present invention solves the technical problems of existing transformer differential protection wiring construction. See the following description for details:

Method used

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  • An inspection method for differential protection wiring of transformers
  • An inspection method for differential protection wiring of transformers

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0029] 1. Use the comprehensive relay protection tester to test whether the system current data and phase are correct or not, and measure the current in the differential coil at the same time.

[0030] 2. The large current simulation system test further measures whether the current data and phase are correct or not, and at the same time measures the current of the differential coil, and the result should be correct.

[0031] 3. Before power transmission, disassemble the relay output connecting piece, make the differential protection withdraw from the protection system for measurement, and further measure the current data and the magnitude of the differential current, and the result should be correct. Connect the connecting piece of the relay protection output to put the differential protection into operation. Thus it can be concluded that the above wiring is correct.

[0032] Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of ...

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Abstract

The invention discloses an inspection method for differential protection wiring of a transformer. The method includes: when determining the polarity of a current transformer, the high-voltage side of the transformer regards the busbar side as the main power supply side, takes the busbar side as positive, and the neutral side For the low-voltage side, the transformer side is the main power supply side, and the transformer side is taken as the positive side; when the current transformer is connected in the high-voltage side: I`a1, I`b1, and I`C1 are the phase currents of the current transformer circuit, and Ia1, Ib1 , IC1 is the circuit current of the current transformer; when the medium voltage side current transformer is connected: I`a2, I`b2, I`c2 are the phase currents of the medium voltage side current transformer circuit; Ia2, Ib2, Ic2 are the medium voltage current transformer on the low-voltage side; when the current transformer on the low-voltage side is connected: I`a3, I`b3, and I`c3 are the phase currents of the current transformer on the low-voltage side, and Ia3, Ib3, and Ic3 are the current transformers on the low-voltage side. route current.

Description

technical field [0001] The invention relates to the field of transformers, in particular to an inspection method for differential protection wiring of transformers. Background technique [0002] In industrial electrical construction, the inspection method of transformer differential protection wiring has always been a problem that plagues transformer differential protection. In traditional construction work, the first step is to determine the polarity of the primary and secondary sides of the current transformer. Secondly, according to the schematic diagram, the circuit calibration and wiring are carried out, and then the test is carried out to confirm the correctness of the wiring and relay protection, which cannot play the role of differential protection. Often, the transformer cannot operate normally due to the malfunction of differential protection, causing major damage. human casualties and economic losses. Contents of the invention [0003] The present invention pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 苏占军郑夏杨谦管宇宋丽蓓
Owner TIANJIN 20 CONSTR
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