Level in Transformer tank
Level in Transformer tank
(OP)
We have a 27,900 gallons capacity transformer tank, with two small elliptical conservator tanks on top. The conservator tank has an air bladder inside and is filled with transformer oil (except for the air bladder).
We want to know the exact oil level on the transformer without going to the top of the tank as this is a 345 kv tank and you don't want to be close to the top of the tank.
We thought of thermography, but the image wasn't helpful (it doesn't seperate between the hot oil and tank). We are thinking of taking the pressure reading of the oil from the vent valve at the bottom of the tank. We will then apply l=p/r where l=level, p=pressure reading and r=density of the oil.
What do you think? Do you see any problem with this method? Do you suggest any other way to measure the oil level on the tank (possibly in the eliptical conservator tank)? Is there a better infrared imager available? any other technology?
We want to know the exact oil level on the transformer without going to the top of the tank as this is a 345 kv tank and you don't want to be close to the top of the tank.
We thought of thermography, but the image wasn't helpful (it doesn't seperate between the hot oil and tank). We are thinking of taking the pressure reading of the oil from the vent valve at the bottom of the tank. We will then apply l=p/r where l=level, p=pressure reading and r=density of the oil.
What do you think? Do you see any problem with this method? Do you suggest any other way to measure the oil level on the tank (possibly in the eliptical conservator tank)? Is there a better infrared imager available? any other technology?





RE: Level in Transformer tank
http://virtualpipeline.spaces.msn.com
RE: Level in Transformer tank
I assume as the liquid level builds up in the tank, the air bladdetr above the liquid is compressed to pre-determined pressure. When this pressure is reached, a pressure sensor activates a motor switch which turns off a pump.
If that is a correct assumption, then you can calculate the volume of the bladder based on the pressure on the gauge, you know the tank volume, the difference would be the oil volume.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Level in Transformer tank
There is no pressure gauge in the tank.
I guess my question now is, if there is any way of finding the oil level in the eliptical tank. The tank wall is 1" alumunium. Thermography didn't show a good signature. Any other ideas without going to the top of the tank or even touching it?
RE: Level in Transformer tank
http://virtualpipeline.spaces.msn.com
RE: Level in Transformer tank
http://virtualpipeline.spaces.msn.com
RE: Level in Transformer tank
Here is just on of sevral companies that does this kind of work. There should be someone nearby that has a hand held device that you could have them use. It shouldn't take more than 10 minutes. I don't think there will be any license problem though these instruments are registered due to the radioactive source contained in the hand held instrument.
http://www.towerscan.com/level_measurement.htm
RE: Level in Transformer tank
http://virtualpipeline.spaces.msn.com
RE: Level in Transformer tank
Are you looking for an accurate level indication, or an alarm to tell you if the tank is not full?