抄録
We analized the switching duties for circuit breakers which are applied to 13.8kV system in the Uruguaiana static frequency converter station interconnected the Brazillian 60Hz and Argentine 50Hz electrical power systems. We usually select the ratings of the circuit breakers for medium voltage system according to the system voltage, normal current and short circuit current without the system analysis; however, by present analysis we found out the severe recovery voltage could be able to appear in the 13.8kV system when circuit breakers interrupted the short circuit current and the capacitor cur-rent. On the basis of these analysis results, we applied higher rated voltage circuit breakers to the frequency converter station.
