Rated Power Frequency Withstand Voltage
Rated Power Frequency Withstand Voltage
(OP)
what would be the Rated Power Frequency Withstand Voltage
for a 75MVA 11KV-161KV 50 HZ?. I need to specify this criteria for a manufacturer. Thanks!
for a 75MVA 11KV-161KV 50 HZ?. I need to specify this criteria for a manufacturer. Thanks!






RE: Rated Power Frequency Withstand Voltage
RE: Rated Power Frequency Withstand Voltage
Secondly, from the sounds of it, you already have the manufacturer picked out, so they should be able to guide you in the selection of the test voltage.
Thirdly, you need to decide what BIL (or lightning impulse withstand level) you are going to specify, as this will decide the power frequency withstand voltage. There may be up to 4 different BIL levels for a particular system voltage, with 4 PFWV values respectively.
Fourthly, you need to know whether your HV winding is fully insulated, as this will restrict the PFWV test value.
But with no responsibility, the PFWV values in our area are:
11kV - 28kV for 1 minute.
161kV - (extrapolated) around 250 - 300kV for 1 minute (again, depending on BIL)
I re-iterate, don't hesitate to look at the standards, they are wonderful documents, and are a must when purchasing equipment in the cost range of a transformer of this size. I would expect that you have referred to them for numerous other parts of the specification, so you should be able to easily glean off the PFWV values quite easily - and if you haven't used the standard for the rest of it, then I suggest that the PFWV values are going to be the least of your concerns.