What is top oil in transformer?
Winding Gradient in Power Transformers Measuring top oil temperature in a transformer gives a good indication of the overall operating state of the transformer. Top oil generally carries the highest temperature profile in the transformer other than measuring the direct winding for temperature hot spots.
How do you check oil level in transformer?
To check the level indicator, remove the outside mechanism for testing without lowering transformer oil. After removing the gauge, hold a magnet on the back of the dial and rotate the magnet; the dial indicator should also rotate. If it fails to respond or if it drags or sticks, replace it.
What happens when a transformer runs out of oil?
If a transformer leaks mineral oil, it can potentially start a fire. Mineral oil is also an environmental contaminant, and its insulating properties are rapidly degraded by even small amounts of water. Transformers are well equipped to keep water outside the oil for this reason.
Why do we need to fill transformer oil?
Oil is an essential part of the transformer. In insulates energized components, dissipates heat and protects solid insulation from moisture. If oil level drops for some reason, the windings and the core of the transformer can overheat, beside the loss of dielectric strength of the insulation system in general.
When should I change the oil in my transformer?
Dissolve Gas Analysis of transformer oil should be done annually for 132kv transformer, once in 2 years for the transformer below 132kv transformer, and once in 2 years for the transformer above 132kv transformer.
What is top oil?
Osmo TopOil High Solid is a Food-safe Hardwax-oil wood finish that is extremely tough and hard-wearing. It is water repellent and dirt resistant as well as resistant to wine, beer, cola, coffee, tea, fruit juices, milk and water.
What is top oil temperature in transformer?
Thermal modeling is one of the important studies for the estimation of the top-oil temperature (TOT) and hot-spot temperature (HST) in transformers. TOT is defined as the average of the tank outlet oil temperature and the oil pocket temperature [1].
What maintains oil level in transformer tank?
The main function of the conservator tank is the regulate and maintain the oil levels in the transformer. The conservatory is attached to the main tank of the transformer in which oil circulates and cools the transformer windings. When the oil becomes hot, its level increases and it reaches to the conservator.
How many gallons of oil go in a transformer?
A 300kVA oil-filled transformer would contain 300 to 400 gallons of mineral oil. What is being used nowadays is type 2 mineral oil.
Why transformer oil testing is required?
Transformer oil, a type of insulating and cooling oil used in transformers and other electrical equipment, needs to be tested periodically to ensure that it is still fit for purpose. This is because it tends to deteriorate over time.