So we have the high voltage that feeds our substation get hit with lightning one night. The building our phone system is in has a dedicated back up generator. The phone system is also behind a large UPS. Somehow this outage blew our CPU card in our sv9100. We called our service campany for the phone system, Northeast IS, and they sent someone up with a new CPU card. Fearing our UPS was failing or just not good enough anymore, we plugged it into a new UPS. The other night we had another power outage and AGAIN our CPU card was blown. We are now on our third CPU card. The gentleman from Northeast IS thought i might be a failing transfer switch from the generator that might be put voltage over ground. However today we got with the Electrical department to meter the system during a switchover to the generator and have not found any voltage over ground.
Has anyone seen anything like this before? Or have any ideas? Anything would be greatly appreciated. Thanks in advance.
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