230kV Auto-Transformer (Insulation Resistance Test)

**rizza_gay** · Posted March 6, 2016

What is the proper connections if I'm going to conduct Insulation Resistance Test for the Auto-Transformer?
For the Primary, Secondary and Tertiary....

Please.

Thank you.

**Sanjayo** · Posted March 7, 2016

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HV + IV to Earth
HV + IV to LV
LV to Earth

Hope this helps.

**rizza_gay** · Posted March 9, 2016

Good day SIr Sanjayo!

Thanks a lot. . .it really helps.

God bless. . .

Warm regards from Philippines. . . .

Rizza

**DickieCornell** · Posted March 11, 2016

Can you please tell the specifications of your Auto transformer?
if you have any image for this and schematic for your system?
Also where you are installing it and what are the specifications of device with which you are going to install this transformer?

smt pcb

**rizza_gay** · Posted March 18, 2016

Good Day Sir Dickie Cornell!
Actually the transformer is a Three Phase Forced-Air Cooling Autotransformer with OLTC.
Its rated Power in MVA are:
HV=37.5 ; LV=37.5 ; TV=11.25
With rated Voltage in kV are:
HV=230 ; LV=69 ; TV=13.8

Manufactured by SEC ALSTOM (Shanghai Baoshan) Transformers Co., Ltd.

Thank you.

**Sanjayo** · Posted March 19, 2016

Sounds like you are testing a very large transformer Rizza, I'm also interested in the application. Are you able to post a picture of the transformer?

**rizza_gay** · Posted March 21, 2016

Originally Posted by Sanjayo

Sounds like you are testing a very large transformer Rizza, I'm also interested in the application. Are you able to post a picture of the transformer?

Pls. see attached file.

Thank you.

Regards,
Rizza

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**Sanjayo** · Posted March 21, 2016

Looks great rizza! Best of luck to you!

Originally Posted by rizza_gay

Pls. see attached file.

Thank you.

Regards,
Rizza

**wooddy** · Posted January 19, 2018

Originally Posted by rizza_gay

What is the proper connections if I'm going to conduct Insulation Resistance Test for the Auto-Transformer?
For the Primary, Secondary and Tertiary....

Please.

Thank you.

there are a couple of options, you can do H1 to Ho, full set of readings, then do one reading from X1 to Xo( this reading will be a constant reading since the tapchanger will be between the H1 and X1 winding, you can then subtract that X1 reading from all of the H1 to Ho readings to just get the H1 to X1 value if needed, as for the tertiary it usualy is a delta so readings would be Y1 to Y2, Y2 to Y3 and Y3 to Y1

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230kV Auto-Transformer (Insulation Resistance Test)

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