Influencing Factors of Breaking Capacity of Double- Break Vacuum Circuit Breakers
نویسندگان
چکیده
Using a series arrangement of two vacuum interrupters (VIs) has been proved to be an effective way of developing higher voltage vacuum circuit breakers (VCBs), which are known as double-break VCBs. The uniform distribution of the transient recovery voltage (TRV) across each VI is very critical for the breaking capacity of double-break VCBs. In this paper, the TRV distribution characteristics of doublebreak VCBs has been studied by the synthetic test and the PSCAD/EMTDC simulation based on a vacuum arc interruption model. The results show that the bias of the TRV distribution ratio is caused by the stray capacitance and the imbalanced post arc plasma characteristic in each VI, which is consistent with the theoretical analysis. Moreover, the negative effect of grading capacitors has been discussed. The results show that it is advisable to limit the value of grading capacitors to those ranges which can guarantee sufficiently improved voltage distribution.
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