Question about transformer

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TAKYMOUNIR

Joined Jun 23, 2008
352
I have transformer have 5 % iz what this mean and what is its affect second i have one transformer 3 phase it does not have any information how can i calculate kva for it
thanks
 

GetDeviceInfo

Joined Jun 7, 2009
2,192
I have transformer have 5 % iz what this mean and what is its affect second i have one transformer 3 phase it does not have any information how can i calculate kva for it
thanks
percent impedance is basically your internal impedance, and is an indicator of the current available during short circuit. This information is relevant when you are selecting appropriate fusing for the trans, as well as sizing it for such things as motor loads. When an attached motor starts, it's relatively heavy current draw will cause a voltage drop in relation to the trans' impedance. This is a very important consideration when supplying motor loads.

Without manufacturer's data, you really can not 'calculate' the KVA. One could determine it's capacity through a number of tests. Although it's physical size is a good indicator
 
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