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What is forced cooling in transformers and name and explain them?

Most power transformers I have seen are filled with oil, and have a base rating of ONAN - which stands for oil natural, air natural. This is a cooling type. There are two main ways to cool a transformer above this rating - by using forced air - essentially attaching fans to help pull heat away, or using oil pumps. With air, the next typical rating is ONAF, or if there are two different ratings (meaning some fans turn on at one, and all fans turn on at two) they may be named ONAF1 ONAF2. thiws stands for oil natural, air forced. If oil pumps are installed, the rating will be OFnn for oil forced. It is possible to have both oil forced and air forced, or just oil forced - OFAN or OFAF. Just an FYI, in my experience oil pumps are typically avoided. It was discovered that pumping the oil can cause a static voltage buildup in the oil, which can lead to catastrophic failures; this doesn't seem to be a problem if oil pumps are not used.


Where would you find a crank and slider?

Used for Oil Pumps and stuff.


What are the type of pumps used for ballast and bilge?

Manual ballast water/bilge pumps are often diaphragm pumps with flapper valves. Large pumps are often positive displacement, centrifugal or moving cavity pumps depending on the amount of crud expected in the ballast.


Where we use positive displacement pumps?

A positive displacement pump causes a liquid or gas to move by trapping a fixed amount of fluid or gas and then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement pumps can be further classified as either rotary-type (for example the rotary vane) or lobe pumps similar to oil pumps used in car engines.Moreover,these pumps give a non pulsating output or displacement unlike the reciprocating pumps and hence are called positive displacement pumps


Composition of hydrocarbons in crude oil?

Crude oil has oxygen, carbon dioxide and gastro hemus in it.

Related Questions

Name three different types of a vehicle oil pump?

Name three different oil pumps connected to an engine


Are the oil pumps different on a Chevy 350 And 454?

Yes, They are a different size.


Compare different types of oil including synthetics?

Compare different types of oil including synthetics?


What is the name of the of the pumps that pumps out oil?

osheen pump


Does a 1991 jeep wrangler have a oil pump?

no... its the only vehicle in history to not use an oil pump. they all have oil pumps genius


What are different types of oil?

Well for one thing there are 2 types of oil 1 gasoline oil and 2 cooking oil


Is the oil pump on a Chevy 305 the same for a Chevy 350?

All small block oil pumps will physically interchange with each other, before 2000. Keep in mind they make high pressure, and high volume pumps, as well. They are usually just big block pumps. Yeah, they are all the same.


How does the oil pump get the oil?

there are about 10,000 plus oil pumps in the world ...


Location of an oil pump on a 1999 ford ranger?

All oil pumps are in the bottom of the crankcase, just below the crankshaft. You need to remove the oil pan to get to the oil pump.


What is the largest source of oil pollution in the ocean?

Nature pumps it's own oil from the ground into many areas. Indians used this goo for different purposes.


What does an oil pump do?

It pumps oil thru-out the inside of the engine.


What temperatures does oil burn?

As there are many types of oil, and because each type of oil contains a number of different compounds within it, different oils burn at different temperatures.