megger test 3 phase transformer

[doc70]

I have a 13800V to 600V 2MVA step-down transformer.

I need to megger test this unit, I have a megger good for 5KV and also a hi-pot DC tester (Megger brand).

I am unclear of how to make the physical connections between the transformer and the testers.

[pillay]

@doc70 said:
I have a 13800V to 600V 2MVA step-down transformer.

I need to megger test this unit, I have a megger good for 5KV and also a hi-pot DC tester (Megger brand).

I am unclear of how to make the physical connections between the transformer and the testers.

make sure the transformer is not connected to any thing like the potential transformer,than carry out

[1] usual insulation test between the frame and the connections terminations of the ht side.

[2] test between frame and the lv side terminations.

[3] test between ht terminations and LV terminations.

[4] test between phases at HT side

[5] test between phases at LV side.

[6]

[smithwalker]

Hipot is an abbreviation for high potential. Traditionally, Hipot is a term given to a class of electrical safety testing instruments used to verify electrical insulation in finished appliances, cables or other wired assemblies, printed circuit boards, electric motors, and transformers.

korg synth

[Spir Georges GHALI]

@pillay said:

@doc70 said:
I have a 13800V to 600V 2MVA step-down transformer.

I need to megger test this unit, I have a megger good for 5KV and also a hi-pot DC tester (Megger brand).

I am unclear of how to make the physical connections between the transformer and the testers.

make sure the transformer is not connected to any thing like the potential transformer,than carry out

[1] usual insulation test between the frame and the connections terminations of the ht side.

[2] test between frame and the lv side terminations.

[3] test between ht terminations and LV terminations.

[4] test between phases at HT side

[5] test between phases at LV side.

[6]

 

Dear Doc70 ;

Refer to Mr. Pillay said, I want to mentioned that the Insulation test Steps are mentioned by Mr. Pillay are 100% correct, but there’s 2 points :

– If the primary voltage is ” 13.8kV “, the ” Insulation voltage ” should be around ” 17.5kV ” ( depending on the manufactere information ), so, what are the obtaining results with ” 5kV ” ?

– If the secondary voltage is ” 600V “, the ” Insulation voltage ” should be around ” 800V ” ( depending on the manufactere information ), so, you can’t do the insulation test for the secondary with ” 5kV “.

[Author]

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