vvvf drive


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Hi , all ,we have a vvvf drive 1250Kw/660v used for fan application,having GTO in its inverter. Now problem is that whenever there is a power dip in system or the breaker is switched off without making drive off,it results in GTO
blowing off. What may be the reasons for it.
A couple of things that can cause these types of failures are oversized feeders and long cable runs to the vfd, also oversized vfd's compared to the attached load. What we have done to correct this problem is install isolation transformers close to the vfd's. Until that was done we had muliple and on going failures.
thanks for the suggestion but i couldnt understand what kind of isolation transformer u r talking about. please elaborate a little more.