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Protective relay device

A relay device and voltage technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection data processing devices, etc., can solve the problems of large relative values ​​and difficulty in practical use

Inactive Publication Date: 2002-10-16
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, contained in the sampled data (i m i m-1 ) The relative value of the noise (quantization error generated during A / D conversion, white noise generated in the analog circuit) becomes large, and there is a problem that it is difficult to put it into practical use

Method used

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Embodiment Construction

[0068] Before describing the various embodiments of the present invention, the principle of the present invention will be described first. When the sampling data of current i=I sin(ωt) is introduced into the transfer function f(Z)=(1+z -1 +z -2 +…+z -n ), the time t shown in formula (10) is obtained m current i' sm .

[0069] I’sm=I·(sin(ωt m )+sin(ωt m -ωT)+…+sin(ωt m -nωT))=I·(sin(n+1)ωT / 2) / sin(ωT / 2))·sin(ωt m -nωT / 2)...(10)

[0070] When the current i' sm Introducing the transfer function ((1+k·z -1 +z -2 ), as shown in formula (11), the time t m current i sm .

[0071] i sm =i' sm +k·i' sm-1 +i' sm-2 =I·(k+2cos(ωT))·(sin((n+1)ωT / 2) / sin(ωT / 2))·sin(ωt m -(n+2)ωT / 2)...(11)

[0072] Similarly, when the current i=I·sin(ωt) is introduced into the transfer function f(Z)·(1-z -2 ), the time t can be obtained from formula (12) m current i jm .

[0073] i jm =2I·cos(ωT / 2)sin((n+1)ωT / 2)·cos(ωt m -(n+2)ωT / 2)...(12)

[0074] The voltage can also be obtained i...

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Abstract

A protection relay device for judging whether an accident point of a power system exists within a specified range, comprising: filter components 1 and 2, for inputting sampling data of voltage and current of the power system into a digital filter having a specified transfer function, Output the first voltage data and the first current data and the second voltage data and the second current data which are orthogonal to the first voltage data and the first current data respectively; the calculation parts 3, 5, 7 and 9, according to the first time the first voltage data, the first current data, the second voltage data, the second current data, and the first voltage data, the first current data, the second voltage data, the first voltage data, the first current data, the second voltage data, the first time two current data to calculate a prescribed measurement value; and an operation judging part, which performs an operation judgment according to the prescribed measurement value obtained by the calculation part. Even if the high-frequency components are generated in the accident voltage and current of the power system, the present invention is not affected, and the reliability can be improved.

Description

[0001] REFERENCE TO RELATED APPLICATIONS [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2001-057948 filed on March 2, 2001, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a protective relay device for reducing the influence of distortion components of accident current caused by power system accidents. Background technique [0004] Generally, a protective relay device is used for monitoring an electric power system. Therefore, the main technical problem in the protective relay device is to reduce the influence of the high-frequency components of the accident current and the accident voltage which are included in the signal input from the system and which occur when the system fails. [0005] In particular, in recent years, in order to increase the system charge capacity component of equipment such as underground cable transmissi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R31/00G01R31/08H02H1/00H02H3/02H02H3/40
CPCH02H1/0092H02H3/40H02H3/02
Inventor 黑泽保广天羽秀也高荷英之
Owner KK TOSHIBA
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