Hi, I am trying to do a basic fault calculation of a 69KV to 120V transformer and am finding GE specs on the unit confusing. This is not something I have a great deal of experience with so some advice would be great.

The unit is the JVT350. If you are interested a spec sheet is easily located by searching on that model.

Specs:

Primary: 69KV

Secondary 120V

Ratio: 600:1

Thermal rating: 4.5KV

BIL: 350KV

And something I do not understand:

"ANSI Accuracy, Burden Per ANSI, W,X,M,Y = 0.3"

What do I use as the impedance for the fault calculation?

Also, just to confirm, thermal VA is the rated secondary output maximum while maintaining accuracy?

thanks!

The unit is the JVT350. If you are interested a spec sheet is easily located by searching on that model.

Specs:

Primary: 69KV

Secondary 120V

Ratio: 600:1

Thermal rating: 4.5KV

BIL: 350KV

And something I do not understand:

"ANSI Accuracy, Burden Per ANSI, W,X,M,Y = 0.3"

What do I use as the impedance for the fault calculation?

Also, just to confirm, thermal VA is the rated secondary output maximum while maintaining accuracy?

thanks!

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