Method for evaluating reliability of relaying protection systems under small sample failure data

A technology of relay protection and failure data, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of lack of data and short cycle.

Inactive Publication Date: 2014-08-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

In addition, the current equipment replacement cycle is relatively short, and many protective devices have never failed during thei

Method used

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  • Method for evaluating reliability of relaying protection systems under small sample failure data
  • Method for evaluating reliability of relaying protection systems under small sample failure data
  • Method for evaluating reliability of relaying protection systems under small sample failure data

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0113] Example 1:

[0114] The following takes the failure record and attribute information of the relay protection device of a provincial power grid company as an example to specifically introduce the reliability evaluation method of the relay protection system under a small sample of failure data.

[0115] Table 1 Running record table

[0116]

[0117] Table 1 screened out the failure records of relatively complete relay systems from the failure records of a certain type of relay protection device of a certain type from a provincial power grid company under approximately the same maintenance level and working conditions from 2005 to 2007. Property information.

[0118] The failure here specifically refers to the refusal and misoperation of the relay protection system. "Misoperation" and "Rejection" are proper terms in the field of relay protection. Corresponding to the correct action of the relay protection system, that is, when a fault occurs inside the protected object / protected...

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Abstract

The invention discloses a method for evaluating the reliability of relaying protection systems under small sample failure data, and belongs to the field of power system relay protection. The problems existing in study of the power system relay protection field at present are solved. The method includes the steps that first, failure samples of the relaying protection systems are integrated; then, a model using Weibull distribution as failure distribution is established by testing the fit goodness, a Monte Carlo method is used for sampling to expand data samples, the data samples and small sample original data are used as priori information together, and a Bayes-Monte Carlo evaluation model is established; finally, reliability evaluation is conducted on each relaying protection system by combining the Bayes-Monte Carlo evaluation model. By the adoption of the method, the limitations that the number of needed samples is large, and the accuracy of reliability parameters is low in practical application in a traditional reliability evaluation method based on large failure samples are eliminated, and reliability evaluation of the relaying protection systems under small sample failure data is effectively achieved.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a method for evaluating the reliability of a relay protection system under small sample failure data. Background technique [0002] As the first line of defense of the power system, the reliability level of the relay protection system is of great significance to the safe and stable operation of the power system. Judging from the statistical data of the current series of documents on the actual operation of the relay protection device, within its working life, the relay protection device seldom has failures or defects such as "misoperation" and "refusal to operate". In addition, the replacement cycle of protection devices is shortened, and the current defect and failure information records of relay protection systems are not very standardized and standardized. Within a certain region and time range, there are fewer complete failure record samples specific to device...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 戴志辉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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