Transformer low-pressure alarm

[lookingtolearn1]

Hi all,

I have several 13800/480 V, 1000 kVA transformers at my site. What is your opinion on bypassing the low-pressure alarms on these transformers? They are in a non-corrosive environment, and there are monthly operator rounds to inspect each transformer's pressure level.

I do not really see a purpose for the low-pressure alarm for anything other than detecting leaks. I do not expect a leaking transformer to allow for the ingress of air long enough to cause any negative issues if there are monthly operator rounds. Does anyone feel differently?

Thanks

 

[augie47]

Why would you want to ?

 

[big john]

Unless you have an automatic nitrogen system on this transformer to maintain a positive pressure, I don't see the value. Considering the number of blanketed transformers I find under a vacuum due to light loads and cold weather, I think this would be nothing but a nuisance alarm.

Routine inspection and oil-level alarms would be the normal method of leak-detection.

 

[lookingtolearn1]

Unless you have an automatic nitrogen system on this transformer to maintain a positive pressure, I don't see the value. Considering the number of blanketed transformers I find under a vacuum due to light loads and cold weather, I think this would be nothing but a nuisance alarm.

Routine inspection and oil-level alarms would be the normal method of leak-detection.

Thanks, John. We do have a nitrogen blanket, but not one that adds additional gas automatically. I expect inspections to notify us of low pressure.

 

[zog]

As long as the pressure stays positive you should be OK, however I would sample and do a DGA more frequently to keep an eye on things, that humid Texas air does not play well with the electrical characteristics of your transformer.