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Sampling data exception detecting method and relay protection method based on redundant CT windings

A technology of sampling data and anomaly detection, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as relay protection device refusal to operate, and achieve the effect of improving reliability

Active Publication Date: 2012-09-19
CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a sampling data abnormality detection method and a relay protection method based on redundant CT windings, so as to solve the problem that the relay protection device refuses to operate after a certain A / D sampling data is abnormal

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  • Sampling data exception detecting method and relay protection method based on redundant CT windings
  • Sampling data exception detecting method and relay protection method based on redundant CT windings
  • Sampling data exception detecting method and relay protection method based on redundant CT windings

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Embodiment Construction

[0035] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] Embodiment of the present invention's abnormal detection method based on redundant CT winding sampling data

[0037] The abnormal detection of sampling data based on redundant CT windings is mainly used in high-voltage relay protection devices of smart substations to monitor the A / D sampling data of the protection devices in real time to improve the reliability of the protection devices. The electronic current transformer is collected by two independent CT windings, and each CT winding adopts a dual A / D system to connect to the same merging unit, and each merging unit outputs two A / D digital sampling values ​​of a CT winding Enter the protection device through the program layer network, therefore, the protection device can simultaneously obtain the sampling values ​​of the two CT windings of the electronic transformer for abnormal det...

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Abstract

The invention relates to a sampling data exception detecting method and a relay protection method based on redundant CT windings, and belongs to the technical field of relay protection of electric power systems. Sampling data of two CT windings of a mutual inductor are used for mutual inspection, namely deviations of two paths of A / D (analog / digital) sampling data of the two windings are respectively compared, the sampling data at a certain sampling point are judged abnormal when both absolute deviation and relative deviation of the momentary value of the sampling point are larger than a set threshold, the sampling point is repaired by an interpolation algorithm when only the sampling point is abnormal, the A / D sampling data are judged abnormal when a plurality of continuous sampling points are abnormal, the sampling data are automatically switched to the second path of A / D sampling data when the first path of A / D sampling data is abnormal, latch-up protection is performed if the second path of A / D sampling data is also abnormal, accordingly, normal running of a protector is unaffected when only one path of A / D sampling data is abnormal, and reliability of the protector is improved.

Description

technical field [0001] The invention relates to a sampling data abnormality detection method and a relay protection method based on redundant CT windings, and belongs to the technical field of electric power system relay protection. Background technique [0002] The relay protection device is an important part of the power system, and it plays a very important role in ensuring the safe operation of the system. When the system fails, it removes the faulty equipment and contributes to the safe operation of the system, but the incorrect action (including refusal and misoperation) of the protection device causes great harm to the system. In recent years, with the maturity of electronic transformer research and the rapid advancement of smart substations, electronic transformers have been widely used in digital substations to obtain current and voltage signals. Compared with traditional electromagnetic transformers, electronic transformers The information of the primary system ca...

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Application Information

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IPC IPC(8): H02H3/26
Inventor 李保福邓茂军胡叶宾纪德贵杨恢宏倪传坤程天保马和科姚东晓吕利娟
Owner CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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