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this is a new one,an oil filled transformer.

we removed all the capacitors.

R-S= GIVE VERY HIGH VALUE. S-T=GIVE VERY HIGH VALUE. T-R=GIVE VERY HIGH VALUE IT GIVE A VERY HIGH VALUE IN THE SECONDARY SIDE THEN RETURN BACK TO 400V,SOMETIMES IT REACHED 1000 VOLT IN THE SECONDARY SIDE.

only in one phase.

not milliseconds but it appear for while then return back to 400Volt

we use avo meter

1-it`s no load. 2-the star is earthed. 3-the measurement is rms.

btw it`s no load

we have a problem during testing the transformer the data is 1600kva,delta/star 11kv/380v while we are testing the secondary side we found the voltage is fluctuated from 400V to 500V or 600V or 700V in a (ms)seconds then return back to 400V.

i`m so sorry davidbeach what i mean it is 15 megawatt.(15MW)

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