For 150 hp load of machine how much kva transformer required

In this article we will discuss about Transformer rating required for particular load of machine.

If we have rating of Machine in HP then first of all we have to convert that rating into KW and thereafter we have to convert this rating into KVA as Transformer rating is in KVA.

For example lets calculate Transformer rating requirement for 150 HP load machine.

Now 1st we convert 150 HP Into KW.

1 HP= 0.746 KW

 Now 150 HP= 0.746*150= 112 KW.

Now as load of machines is inductive load so we consider power factor for that machine as 0.8.

Now we will convert KW into KVA

Now KVA rating of machine = 112/0.8= 140 KVA

Now Transformer rating is always selected as 20% higher than the required load rating considering jerk load and overloads at machines few times. 

So considering factor of safety as 20% we will calculate the rating of Transformer required as = 140X1.20= 168 KVA 

Now, next available rating of Transformer is 200 KVA so transformer having rating equivalent to 200 KVA is selected for the purpose.

Similar way you can calculate the rating of transformer for other machines as well.

Usually transformer selected for above purpose are Delta - Star Transformers.