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Method for compensating capacitance current in differential current of generator

A technology of capacitive current and differential current, which is applied in the direction of electrical components, emergency protection circuit devices, etc., can solve problems such as differential protection misoperation, and achieve the effects of preventing protection misoperation and refusal, simple implementation, and high capacitance current

Inactive Publication Date: 2011-09-14
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the generator to compensate the capacitive current in the differential current, aiming to solve the influence of the capacitive current on the differential protection and prevent the problem of differential protection malfunctioning and refusal

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  • Method for compensating capacitance current in differential current of generator
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  • Method for compensating capacitance current in differential current of generator

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0027] The outer semiconductor layer of the high-voltage generator cable is grounded at multiple points at a certain interval. It can be considered that the potential of the outer semiconductor layer is the same as the ground potential, which means that the electric field of the winding is concentrated between the inner and outer semiconductor layers of the cable, and the leakage of the electric field is very small , it can be considered that there is no electrical coupling relationship between the high-voltage generator cables, which is different from the situation of conventional generators. Therefore, the inter-turn, inter-winding and inter-phase coupling capacitance must be considered when analyzing the capacitive current of the conve...

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Abstract

The invention discloses a method for compensating capacitance current in differential current of a generator. The winding capacity of a generator is equivalent to a generator terminal and a neutral point of the generator, but the winding capacity is not partitioned into two equal parts and the partitioning coefficient is calculated according to the structure of the generator. The method can be used to compensate the capacitance current in differential current so as to improve the protection reliability; meanwhile, the method is easy to operate and can prevent the protection false operation and failure action.

Description

technical field [0001] The invention relates to a method for accurate compensation of capacitive currents in differential currents for generators. Background technique [0002] At the end of the last century, ABB Power Generation Company invented a high-voltage generator that uses high-voltage cables to wind stator windings, thus realizing the direct connection between the power generation unit and the high-voltage transmission network. This novel generator is a high-voltage generator. The winding of the high-voltage generator is made of high-voltage XLPE insulated cables originally used for transmission lines, and the cable-to-ground capacitance can be considered to be mainly formed by charging and discharging between the inner semiconducting layer and the outer semiconducting layer. The design of high voltage generator windings is different from that of conventional generators, that is, the thickness of the insulating layer is not uniform, but gradually increases from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06
Inventor 田庆
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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