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[Engineer]

Greeting for everybody,

 

I've a 50Hz dry type transformer which will be used for lighting. The applicable standard material specification requirement is a minimum of 4% impedance for this particular transformer. But, the actual impedance of the transformer is 3%.

 

Can any one of you explain to me what is the impact of using this transformer which has an impedance below the minimum requirement?

[marke]

Hello Engineer

 

For a given load, the voltage drop through the transformer will be lower. This is not usually a problem.

 

The other consideration is that because the impedance is lower, the fault current could be higher.

In most cases, that is not an issue either. The fault current is determined by a combination of the primary side fault current and the transformer impedance.

 

Best regards,

Mark.