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Transformer testing

Transformer testing

Transformer testing

(OP)

Can you suggest what is more advantage or helpful  in Transformer testing, doing insulation resistance test or insulation power factor test.

Thank you.

RE: Transformer testing

What kind of transformer does your question apply to, dry type or oil filled?

RE: Transformer testing

(OP)
  For power transformer oil filled.

RE: Transformer testing

The power factor test is more comprehensive if I had to limit myself to just one, but why would we do that?

Power factor test set = $$$

Insulation resistance test set = $

Hiring a competent testing contractor to show up and do the tests usually means you get BOTH tests anyway.  They are part of a pretty standard battery of tests on oil-filled transformers above a certain size.

old field guy

RE: Transformer testing

I am familiar with insulation resistance testing (meggar test) when commissioning a transformer, but I've never heard of an insulation power factor test.  Can someone please give me a brief explaination?

Thanks!

RE: Transformer testing

megger****

RE: Transformer testing

It also called dissipation factor and test the real component of the leakage current through the insulation.  Ideally, when insulation is in a good shape, the leakage current is purely capacitive.  However, e.g. when water presents the leakage current will have resistive component.  

RE: Transformer testing

Google tan delta test - loads of hits.
 
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Transformer testing

Another thing is
megger - DC
PF/DF/Tan_D tester - AC   

RE: Transformer testing

Thanks!  I learned my one new thing today!

RE: Transformer testing

What is the difference of a Vacuum Circuit Breaker and a Load Break Switch in terms of its usage?

RE: Transformer testing

Breaker - capable to interrupt a fault current
Load break switch , by its name - can interrupt the load current but not the fault current

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