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Differential current calculation method for gear adjustment of adaptive UHV tap transformer

A voltage regulating transformer and differential current technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problem of inability to obtain real-time gear information, and achieve the effect of ensuring accurate and reliable operation, improving sensitivity, and improving reliability.

Inactive Publication Date: 2017-06-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0004] The present invention aims at the problem that UHV transformers cannot obtain real-time gear position information in field actual engineering, and proposes a method capable of obtaining the actual operating transformation ratio of UHV voltage regulating transformers and introducing differential current into protection devices in an adaptively regulated manner

Method used

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  • Differential current calculation method for gear adjustment of adaptive UHV tap transformer
  • Differential current calculation method for gear adjustment of adaptive UHV tap transformer
  • Differential current calculation method for gear adjustment of adaptive UHV tap transformer

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Embodiment

[0064] Since the three phases A, B, and C of the UHV voltage regulating transformer are composed of three independent transformers, the differential protection of phase C of the UHV voltage regulating transformer is taken as an example to illustrate. A new method is used to obtain the actual operating gear of the voltage regulating transformer and correct the differential current introduced into the protection device. The process is as follows:

[0065] 1) In the simulation model, set the operating voltage of the UHV transformer as That is, the operating gear of the voltage regulating transformer is 4 gears. The differential current of phase C is converted to the primary side of the secondary side TA5 of the voltage regulating transformer, and its waveform within 0.1s (20ms closing) is as follows image 3 shown;

[0066] 2) Calculate the C-phase differential current when the differential current is compensated with a fixed transformation ratio. The fixed transformation r...

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Abstract

The invention provides a differential current calculation method for gear adjustment of an adaptive UHV voltage regulating transformer. In the differential protection of voltage transformers, the differential current can be corrected accurately and reliably. The invention solves the problem that the UHV transformer cannot obtain real-time gear position information in the actual project on site and the problem that the differential current introduced into the protection device under different gear positions has a large difference due to the large voltage regulation range of the voltage regulating transformer, and improves the regulation. The sensitivity of differential protection in case of faults in the transformer area not only solves practical engineering problems, but also has practical significance in improving the reliability of UHV voltage regulating transformer differential protection and ensuring its accurate and reliable operation.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a differential current calculation method for gear adjustment of an adaptive UHV voltage regulating transformer. Background technique [0002] UHV AC transmission is developing steadily and is at the forefront of power grid technology development, with advanced features that cannot be ignored. UHV transformer is the core electrical equipment of 1000kV UHV AC transmission, and its operation is directly related to the safety and stability of the entire power grid. Therefore, it is necessary to put forward high requirements on the reliability of the main protection of UHV transformer. The 1000kV UHV transformer consists of two parts: the main transformer and the voltage regulation and compensation transformer. The voltage regulation compensation transformer is composed of an independent voltage regulation transformer and compensation trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045
Inventor 郑涛陆格野杨松伟陈水耀
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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