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After testing a power transformer(pt) and closing its wiring terminals I've encountered that phase S 63 kV correct voltage and phases R and T shows incorrect voltage 32 kV.

Can any body tell why?

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  • $\begingroup$ is there any load on the phases? $\endgroup$ – Solar Mike Jan 31 '19 at 9:37
  • $\begingroup$ So how does that tell us if there is any load? $\endgroup$ – Solar Mike Jan 31 '19 at 9:56
  • $\begingroup$ This pt is in the switchyard and between Gen and line.When we have tried to connect the line (Gen is disconnected)to the switchgear the protection operated with the above voltages that pt read.(line voltage) $\endgroup$ – Allen Jan 31 '19 at 9:58
  • $\begingroup$ I suggest you get a qualified electrician to look into what is going on and don't touch any more. $\endgroup$ – Solar Mike Jan 31 '19 at 10:00
  • $\begingroup$ There is no load on it. Just voltage $\endgroup$ – Allen Jan 31 '19 at 10:01
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As I Know when you close the breaker you have seen the voltages. You should check the secondary circuits fuses. This voltages shows open circuits of one poles. If the polarity of poles were incorrect you shoud have seen 37Kv on other poles. If fuses were healthy you shoud check the open circuits of PT secondery circuits.

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