Transformer differential protection method and device

A differential protection and transformer technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of transformer reliability and sensitivity reduction

Active Publication Date: 2017-02-22
上海思源弘瑞自动化有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, if there is a single-phase grounding on the high-voltage side and a two-phase short-circuit on the low-voltage side in the compensation of the star angle on the star side, or a two-phase short circuit on the high-voltage side in the compensation of the star angle on the angle side, at this time, the reliability and sensitivity of the transformer will reduce

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  • Transformer differential protection method and device
  • Transformer differential protection method and device

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Embodiment 1

[0048] figure 1 It is a flowchart of a transformer differential protection method provided by the embodiment of the present invention. This embodiment is applicable to the differential protection of transformers with star and delta connection groups. The method can be implemented by the transformer provided by the embodiment of the present invention. Differential protection device, which can be realized by software and / or hardware, and can be integrated in transformer relay equipment, such as figure 1 As shown, the transformer differential protection method specifically includes:

[0049] S110. Obtain initial parameters of the transformer.

[0050] Specifically, a transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components include primary coils, secondary coils and iron cores, which can be divided into many types according to their functions and uses. Each type of transformer will have different parameter values, the...

Embodiment 2

[0128] Figure 8 It is a structural schematic diagram of a transformer differential protection device provided by an embodiment of the present invention. This embodiment is applicable to the differential protection of transformers with star and delta connection groups, the device can be realized by software and / or hardware, and the device can be integrated in transformer relay equipment, such as Figure 8 shown. The device specifically includes: a parameter acquisition module 81 , a phase adjustment module 82 , a fault current calculation module 83 and a differential action judging module 84 .

[0129] The parameter acquisition module 81 is used to acquire the initial parameters of the transformer;

[0130] The phase adjustment module 82 is used to perform star rotation angle phase adjustment and angle rotation star phase adjustment on the star side and angle side of the transformer according to the initial parameters of the transformer, and obtain the corresponding star rot...

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Abstract

The embodiment of the invention discloses a transformer differential protection method and device. The method comprises the following steps: acquiring an initial parameter of a transformer; respectively performing star-delta and delta-star phase adjustment on the star side and delta side of the transformer; calculating failure current generated when the transformer fails according to the current value after phase adjustment; and tripping a relay and leading the transformer to execute the differential protection action if the failure current meets conditions, no ratio differential mark exists and the differential protection is in a start state. According to the embodiment, star-delta and delta-star compensation principles are performed on the transformer, so that the differential protection reliability and sensitivity of the transformer can be further improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of relay protection, in particular to a transformer differential protection method and device. Background technique [0002] As an important equipment of the power system, the transformer will seriously affect the normal power supply and equipment safety of the power supply system when it fails. In order to eliminate the above effects, protection devices are usually installed in the transformer, that is, relay protection is carried out on the transformer. [0003] The wiring group of the current main transformer is generally Y / D-11, and the current difference on both sides is 30°. In order to achieve the balance of the differential current, it is necessary to compensate the current on both sides. The existing compensations are mainly divided into two categories: one is to perform star rotation on the star side, and the other is to perform angular rotation on the angular side. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 刘家军陈可友韩行军曹兴春刘扬
Owner 上海思源弘瑞自动化有限公司
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