Skip to main content

What is the function of oil in transformer?

 What is the function of oil in transformer?

 


The oil used is purposed for two main reasons;

1. Cooling

2. Insulating

 

The oil used must possess the following properties.

1. High dielectric strength

2. Free from inorganic acid, alkali and corrosive sulphur to prevent injury to the conductor or insulation.

3. Low viscosity to provide good heat transfer

4. Free from sludging under normal operating conditions.

5. Good resistance to emulsion so that the oil may throw down any moisture entering the tank.

 
Cooling

The transformer windings dissipate waste heat, which needs to be removed. Transformer oil absorbs this heat from the windings and conducts it to the outside of the transformer, where it can be dissipated to the outside air.

It is possible to build an air-cooled transformer. These are used where spillage of the insulating oil is an unacceptable hazzard. I.e., for indoor hazard.

 

Insulation

All parts which might be at different voltages must be insulated from each other.

 In air insulated equipment adequate clearance must be allowed around all live parts, to prevent flashover through the air. Alternatively, solid insulation would be required to all live arts, which is expensive. Oil is much better insulator than air, so the clearanes can be reduced. This makes the equipment much more compact.

Commerical transformer use both solid and liquid insulation. Solid paper insulation is used for the windings, where to cover all the parts that don’t have solid insulation. The oil also penetrated into the paper and fills the air gaps, improving the quality of the paper insulation.  

 

Poly-chlorinated biphenyl (PCB) is used as the insulating liquid of choice.


If you have any doubts regarding this topic ask me the comment section.


                                  TAKE CARE....CHEERS....BYE!

Labels:
Location: Khomai Shirajgaon Rd, Pala, Maharashtra 444810, India

Comments

Post a Comment

Popular posts from this blog

Voltage or Current. Which is the real killer?

Voltage or Current. Which is the real killer? Hey guys, This might be the most controversial   this or that question after the famous chicken or egg. Lets see it clearly, It is not the high current or high voltage that kills you.        Take  for eg., a 24V   battery can produce much higher current than the wall socket (in the range of 10-15 amps) in our home does.  Still it can’t electrocute us if we touch both the terminals.       So what it is? Is it the high voltage that kills us. No, it is not for sure.       To get clear about this take an example of Van de graaff generator what you might have heard in high schools or in youtube videos. So a large Van de graaff generator  can produce 500000 volts or 500kv , but we had seen a stranger touching the sphere with his bare hand. The reason here is the over all rated output current generated in Van de graaff is in th...
Post a Comment
Read more

Why we use stepped core in transformer?

Why we use stepped core in transformer?  Usually, rectangular core is used for small rated transformer while the coil can be either square or rectangular.  But for highly rated power transformer, we require circular coils only, so we have to use circular core(stepped core). Circular coil is preferred in power transformer due to its Superior mechanical characteristics.  On circular coils, the mechanical force acts radially, so the stress is less and shape of coil do not change, however if we use rectangular coils, then the mechanical forces acts perpendicular to the coil results in creating high stress which would deform the coil shape. This is the reason why circular coils are preferred over other coils for power transformer.  So the reason for circular core is that, if we use rectangular core, then the useful space is not utilized better resulting a air between the coil and core. This affects in increasing the length of mean-turn of the winding which further incr...
Post a Comment
Read more