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manologalvan
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Join Date: Dec 2009
Posts: 2

Testing a Thyristor

12/21/2009 8:20 PM

how to test a thyristor using a 1KV megger
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jack of all trades
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New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
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Good Answers: 376
#1

Re: thyristor

12/21/2009 10:27 PM

Don't you will destroy it!

Try a Google search of "thyristor test" for correct (and non-destructive) test methods.

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 jack of all trades
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jhonson
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Join Date: Nov 2009
Location: PA
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#2

Re: thyristor

12/22/2009 10:08 AM

What are you testing with a megger? Use ohm- meter to test the resitance between anode, cathode, gate. Even that is not enough I guess, you should apply the forward bais voltage and gate pulse and see whether the latching and holding current are correct.
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manologalvan
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Join Date: Dec 2009
Posts: 2
#3

Re: Testing a Thyristor

12/29/2009 12:15 AM

Dear All: I just join a company where they use a procedure for testing the integrity of the power thyristors in the Power Unit. The Thyristor is Semipack 3 SKKT 20/20E from Semikron.The integrity of the forward and reverse blocking voltage of each power thyristor is checked with a 1000VDC megger by measuring its resistance. It identify those thyristors with marginal / failed blocking voltages. The megger used is Biddle 212559. The Power unit is considered defective to be defective if any of the megger readings are lower than 50 megohms. Your answer will be appreciated.

Manolo
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