A Calculation Method of Failure Probability of Substation Equipment Based on Failure Mode
A technology of failure mode and substation equipment, which is applied in the fields of computing, electrical digital data processing, special data processing applications, etc., can solve the lack of theoretical basis of failure mode and a unified comprehensive method, and does not effectively consider the interconnection of various failure phenomena. , Inability to understand the equipment failure status, etc., to achieve the effect of accurate calculation, simple calculation, and avoiding maintenance omissions
Inactive Publication Date: 2018-02-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology
There are various failure modes of substation equipment, and the causes of failure are complex. A simple failure mode may correspond to two or more reasons. At the same time, many reasons under different failure modes may be partially the same. Other failure modes may also occur
However, the existing diagnostic methods fail to regard the diagnostic object as an organic whole, do not effectively consider the possible interrelationships between various fault phenomena, and lack the theoretical basis and unified comprehensive method for systematic fault modes. Gain a holistic view of equipment failure conditions
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Embodiment Construction
[0028] Taking the transformer as an example, the specific implementation of each step is as follows:
[0029] (1) Construction of fault tree
[0030] A fault tree is a tree-like logical causal relationship diagram, which describes the causal relationship between various events in the system with specified events, logic gates and other symbols. Through the fault tree, various possible factors of system failure can be connected, which is helpful for us to discover the weak link of the system and the trend of system failure.
[0031] The fault tree analysis method first constructs an inverted tree structure that reflects the causal relationship between faults, and then obtains the weak links of the system through tree simplification and quantitative analysis. The key is to construct the fault tree, and the perfection of fault tree construction will directly affect the accuracy of its qualitative analysis and quantitative calculation. In fact, the process of building a tree is o...
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The invention belongs to the field of on-line monitoring and fault diagnosis of substation equipment in a power system, and relates to a new fault probability calculation method based on the fault mode of the equipment. Specifically include, according to the established equipment fault tree, calculate the occurrence probability Pi (i=1, 2...n) of various failure modes, and the severity Ii (i=1, 2...n) of various failure modes And the degree of harm Wi(i=1, 2...n) of various failure modes to the equipment. When each failure mode is independent of each other, the failure rate λ of the equipment caused by each failure mode can be calculated according to the series model in the failure reliability theory, that is lambda = Σ i = 1 n W i I i P i - - - ( 1 ) Among them, the calculation of the existence probability Pi of defects corresponding to various failure modes of substation equipment is based on the defect probability calculation method based on the statistical probability distribution of online monitoring data; the calculation of the severity Ii of defects corresponding to various failure modes is based on the equipment The development process of the defect and the development and change law of the characteristic parameters are obtained; and the hazard degree Wi of the failure mode is obtained by using the fuzzy analytic hierarchy process.
Description
technical field [0001] The invention belongs to the field of on-line monitoring and fault diagnosis of substation equipment (substation equipment including transformers, GIS equipment, circuit breakers, mutual inductors and lightning arresters) in power systems, and relates to a new calculation method of failure probability based on equipment failure modes. technical background [0002] In recent years, the increasing demand for electric energy has made the power system develop towards large capacity, ultra-high voltage and cross-region. However, the development speed of the power system cannot always fully meet the growth of demand, so the overload operation of the power grid occurs from time to time. The overload operation will seriously shorten the service life of power equipment, which will lead to large-scale power outages. It can be seen that how to ensure the safe operation of electrical equipment, timely discover hidden dangers, effectively reduce power system accid...
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IPC IPC(8): G06F17/50
Inventor 程养春蔡巍赵子健龙凯华李志刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)