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Dual-redundancy A/D (analog/digital) sampling signal effectiveness judgment method and relay protection method

A relay protection, sampling signal technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of abnormal data without considering abnormal data and other problems, and achieve the effect of high sensitivity

Active Publication Date: 2015-01-07
CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +2
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Problems solved by technology

[0004] The current dual-redundant A / D sampling, considering the data sampling itself, is only to obtain the sampling data and ensure that at least one sampling signal can be provided to the protection device. However, it does not consider the possible abnormal problems of the sampling data and how to process the data. unusual problem

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  • Dual-redundancy A/D (analog/digital) sampling signal effectiveness judgment method and relay protection method
  • Dual-redundancy A/D (analog/digital) sampling signal effectiveness judgment method and relay protection method
  • Dual-redundancy A/D (analog/digital) sampling signal effectiveness judgment method and relay protection method

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Embodiment of Double Redundancy A / D Sampling Data Validity Judgment Method

[0027] First of all, compare and detect the sampling data of the double A / D. The method of real-time calculation of the absolute deviation and relative deviation between the sampling data of the double A / D is adopted for the comparative detection of the sampling data of the double A / D. When the deviation between the dual A / D sampling data satisfies both the absolute deviation and the relative deviation discriminant formula, it is judged as an abnormal point of the sampling data. The discriminant formula is as follows:

[0028] | x - y | > 0.1 In ...

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Abstract

The invention relates to a dual-redundancy A / D (analog / digital) sampling signal effectiveness judgment method and a relay protection method. Before a dual-redundancy relay protector gives an exit instruction, effectiveness of dual-redundancy A / D sampling signals is judged, latch-up relay protection is performed when data are invalid, and absolute deviation and relative deviation of dual-redundancy A / D sampling data are calculated to judge whether the sampling data are abnormal or not in the dual-redundancy A / D sampling signal effectiveness judgment method. In the relay protection method, before the exit instruction is given, effectiveness is judged, a latch-up protection function is realized, and relay protection malfunction cannot be caused by the abnormal sampling data.

Description

technical field [0001] The invention relates to the technical field of dual redundant relay protection, in particular to a method for judging the validity of a dual redundant A / D sampling signal and a corresponding relay protection method. It is especially used in relay protection devices for high-voltage substation automation systems that require high reliability. 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 of the relay protection also causes great harm to the system. [0003] A / D sampling is the source of information for the work of the microcomputer relay protection device, and the sampling data is crucial to the reliability of the relay protection. The sampling circuit of the high-voltage relay protectio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00
Inventor 李洪凯李宝伟倪传坤王国辉李文正李旭石欣郝慧贞唐艳梅王莉
Owner CHAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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