Method for on-line diagnosing gradually-changing fault of electronic current transformers
An electronic transformer and current transformer technology, applied in the field of gradual fault online diagnosis, can solve problems such as staying in regular power outage maintenance and so on.
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Example Embodiment
[0175] Experimental example 1: On March 7, 2011, the monitoring data is shown in Table 1 below
[0176] Table 1 Comparison of residuals
[0177]
[0178] As can be seen in Table 1, the residual error of each transmission line and transformer is less than the threshold ε 0 , Which shows that there is no gradual failure of the electronic current transformer in the substation, and there is no fault after field detection, which proves that the judgment is correct. The experimental results verify the accuracy of the electronic current transformer fault diagnosis method of the present invention.
Example Embodiment
[0179] Experimental Example 2: On June 28, 2011, the monitoring data is shown in Table 2 below
[0180] Table 2 Comparison of residuals
[0181]
[0182] As can be seen in Table 2, line 1 starts from the third sampling point, and the residual ε b1 Respectively 0.021I 0 , 0.023I 0 , 0.024I 0 , 0.025I 0 , 0.026I 0 , 0.025I 0 , 0.026I 0 , 0.027I 0 , Both exceed the set threshold ε 0 , The calculated residuals on other lines and transformers do not exceed the threshold ε 0 , Indicating that there is a gradual failure of the electronic current transformer on line 1, and there is no gradual failure of the electronic current transformer on line 2, line 3, and transformer. Perform Kirchhoff test on the sampling instantaneous values of the electronic current transformers on all branches of the busbar of this substation, and the test result is greater than 0.027I 0 , That is, the vector sum of the current flowing into the bus is greater than ε 0 , Which means that the electronic current tra...
Example Embodiment
[0183] Experimental example 3: On August 16, 2011, the monitoring data is shown in Table 3 below
[0184] Table 3 Comparison of residuals
[0185]
[0186] It can be seen from Table 3 that line 3 starts from the fourth sampling point, and the residual ε b3 Respectively 0.022I 0 , 0.021I 0 , 0.022I 0 , 0.023I 0 , 0.025I 0 , 0.027I 0 , 0.026I 0 , Both exceed the set threshold ε 0 , The calculated residuals on other lines and transformers do not exceed the threshold ε 0 , Indicating that there is a gradual failure of the electronic current transformer on line 3, and there is no gradual failure of the electronic current transformer on line 1, line 2, and transformer. Perform Kirchhoff test on the sampling instantaneous values of electronic current transformers on all branches of the busbar of this substation, and the test result is less than ε 0 , That is, the vector sum of the current flowing into the bus is less than ε 0 , Which means that the electronic current transformer with gra...
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