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Transformer standby method based on state monitoring and reliability criteria
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A transformer and reliability technology, applied in the field of transformer backup based on condition monitoring and reliability criteria, can solve the problem of not being able to accurately assess the reliability of the transformer and the risk of the system, not considering the actual state of the transformer, ignoring the use time of the transformer, and the operating conditions. and operating environment
Inactive Publication Date: 2019-07-02
STATE GRID CORP OF CHINA +2
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[0004] However, the disadvantages of existing transformer backup methods are: 1) According to the statistical data of historical faults, it is believed that each transformer in the transformer group has the same failure rate, ignoring the differences in the service time, operating status and operating environment of each transformer ; 2) The backup method can determine the number of backup transformers, but cannot determine the placement time of the backup transformers; 3) The aging failure rate of transformers is only evaluated based on the service age of the transformers, without considering the actual state of each transformer, so it cannot Accurately assess transformer reliability and system risk
[0005] For example, the existing method proposes that the failure rate of each transformer is set to be 0.015 times per year, and the number of spare transformers determined is one, and the time for the spare transformer to be put in place is not determined, and some studies are calculated based on the service age of the transformer The aging failure rate of the transformer, ignoring the actual state of the transformer
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Embodiment 1
[0073] see figure 1 , a transformer backup method based on condition monitoring and reliability criteria, mainly includes the following steps:
[0074] 1) Get transformer data.
[0075] The transformer data mainly includes measured data of transformer state monitoring quantities, weighting coefficients of transformer state monitoring quantities, transformer aging failure parameters, average repair time of transformers, and average failure frequency of transformers.
[0076] The transformer aging failure parameters mainly include transformer service age parameters, aging failure rate model parameters and retirement age parameters.
[0077] 2) Calculate the transformer aging index.
[0078] The main steps to calculate the transformer aging index are as follows:
[0135] An experiment to verify a transformer backup method based on condition monitoring and reliability criteria mainly includes the following steps:
[0136] 1) Enter all required parameters, including:
[0137] Input the number of transformers n=22 of a power company X transformer group, and the measured data x of the i-th transformer f=6 state monitoring quantities ij and weighting factor w j , where i=1,2,…,n, n is the number of transformers, j=1,2,…,f, f is the number of state monitoring quantities, and the weighting coefficient w j As shown in Table 1:
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Abstract
The invention discloses a transformer standby method based on state monitoring and reliability criteria. The transformer standby method mainly comprises the following steps: 1) obtaining transformer data; and 2) calculating the transformer aging index. And 3) calculating the number of decommissioned standby transformers in the planning time period t and the in-place time of all the transformers. And 4) calculating the total failure rate of the transformer in one period. And 5) calculating the probability that the transformer is in the mth failure state within one period. And 6) calculating thereliability level of starting the yth standby scheme by the transformer within the planning time period t. And 7) calculating the in-place time of the optimal standby scheme and the number of transformers which fail to be standby within the planning time period t. According to the method, the actual state of the transformer can be accurately evaluated by fully utilizing the actual measurement data of the state monitoring quantity of the transformer, the actual state and the failure rate of each transformer are considered by the established model, and the reliability of the transformer bank can be accurately evaluated.
Description
technical field [0001] The invention relates to the field of transformer backup, in particular to a transformer backup method based on state monitoring and reliability criteria. Background technique [0002] The transformer is one of the core equipment to ensure the normal operation of the power grid. It undertakes the functions of energy conversion and transmission, and plays an important role in the reliable operation of the power system. The failure of the transformer includes repairable failure and aging failure. When the repairable failure of the transformer occurs, usually It takes a long time to restore the power supply. Aging failure is an irreparable failure, which means the end of the life of the transformer. When the transformer suddenly fails due to aging, it will take longer to replace the failed equipment by purchasing a new transformer. Therefore, when the transformer fails, it may lead to serious power outage accidents, and then cause serious economic losses....
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