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Thank you for the reminding. Yes, please exclude the OCB, SF6 only.

Thank for all responses. Breakers I am discussing here are 100kV-230kV, OCB or SF6 insulation type...Thanks

Hello, We are quite familiar with the transformer factory acceptance tests, but know very little about high voltage circuit breaker's. Anyone can provide such information? If you have the source document, that will be really good.

Thanks

THank you smallgreek. We are the utility co in the US. We have the tank trucks that can handle large amount of oil. Yes our crew are in union. We plan to do it in the summer, which typically is around 75-80F. It's not a GSU, but a quite critical transformer. We are the winter peak, so the...

One of our 1966 ASEA, 75MVA transformer has a damaged conservator bladder. If you have the experience about the transformer conservator bladder replacement, could you share with me what is the ballpark cost of such replacement? Thanks

IS based on nameplate rating, or based on the IEEE 57.91?

Is there a switch inside the mechanical gauge that can turn the thermal trip "off"?

Hi Scott, The trips were always caused by wrong setting or the mel-function of the old mechanical gauges. So we decide to remove the automatice thermal trip function, replace with manual trip. Normally, industry wide, the thermal trip is set at 140C, but we were seldom to load the transfomrer...

DO you disconnect at the end of Hot Spot Winding temmperature gauge, or at the relay end? Is the transformer outage required? Thanks

In my company, all Bank # = Transformer # = Unit #, except one pair (which have same Bank # but different Transformer #).

prc, You're right. I was wondering why it's called Tap Selector Compartment, not "OLTC" compartment.

This is a 1956 transformer. I thought OLTC was for much newer transformers.

Thank you Steven, Yes you're right, the "On Load Tap Changer" is on the X side. It's my mis-understanding to identify it as the DETC. So we may put in this way? - The compartment of OLTC is much less sealed. There is no much acr generated in that compartment (not much comtamination), since...

Steven, it's a DETC transformer

Picture attached. The compartment is called: Load Ratio Control Mechanism - Tap selector Compartment. THe Liquid Lvl Gauge is for this compartment...

I attach the picture. The compartment is called: Load Ratio Control Mechanism - Tap selector Compartment. THe Liquid Lvl Gauge is for this compartment.

Yes it is. And it's with a liquid level gauge (always pointed to the max). SInce DETC is in the main tank for some models, does this indicate it will be ok if liquid leaks from main tank to the DETC compartment?

The leak has been lasted for many years. And the DGA result shows normal.

I am sorry, I made the typo, it's DETC, not LTC compartment.