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My main question is how a HV motor can work such low insulation. I can not do the insulation test now because the motor is running.

The supply cables were desconnected from the motor. I am attaching the test setup. https://files.engineering.com/getfile.aspx?folder=58f4b5c3-c3b8-45fe-8bd7-bf17feb73c69&file=insulation_test_.pdf

The PI value was 1,3 without the guard probe. We did not measure it with the guard probe.

I have in my plant a 2500 kW, 13200 V, 20 poles brushless synchronous motor. The machine was running and when it stopped i did the insulation test with 5 kV. The insulation test result was 3 MΩ. The machine is installed in sheltered place and it does not have any signs of oil, dirty or...

One thing that puzzles me it is that the only gas in a raise level is acetylene. Other gases, such as, Hydrogen do not raise its level.

Guys, I have received the latest DGA results. These analysis was made by a different laboratory from the previous ones. NOV first 2016 (ppm) H2:9 O2:38200 N2:113500 CH4:3 CO:72 CO2:1030 C2H4:3 C2H6:0 C2H2:32 Total:119 NOV eleven 2016 (ppm) H2:10 O2:38700 N2:112100 CH4:3 CO:81 CO2:1070 C2H4:3...

We did 24 hours of vacuum before filling the transformer and we also recirculated 4 times the oil volume, which is 40.000 L, through thermo vaccum equipment.

Yes. There ware tap changer operations after the re-energization. The OLTC is one VACUTAP series. The most recent DGA: (08/17/2016) H2: 5 O2:14100 N2:45400 CH4:3 CO:32 CO2:410 C2H4:2 C2H6:6 C2H2:13 Total:61 The first DGA after re-energization (05/07/2016) H2: 2 O2:4000 N2:13700 CH4:0 CO:0...

Yes. The oil was thoroughly degassed before it was returned to the transformer. We did DGA after the job and before load the transformer and the gases level was zero.

Guys, We have in our plant a 230 /13,8 kV 31 MVA transformer that had the following DGA result (in ppm): H2: 228 O2:15400 N2:74000 CH4:41 CO: 297 CO2:1570 C2H4:64 C2H6:9 C2H2:179 Total:818 After this result, we did the ultrasonic test to locate some partial discharge inside the equipment. The...