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Damaged Igbt


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#1 JUAIAM

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Posted 02 February 2009 - 05:16 PM

Hi, I'm Argentine and work in railways maintenance.
My query is:
Lately we have had repeated breakdowns in the power module of VVVF inverters, with the breaking of many IGBTs.
If sending pictures of IGBT damaged, you can know that may have caused the breakage, overvoltage or overcurrent?

thank you very much!




#2 JUAIAM

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Posted 02 February 2009 - 05:31 PM

QUOTE (JUAIAM @ Feb 2 2009, 02:16 PM) <{POST_SNAPBACK}>
Hi, I'm Argentine and work in railways maintenance.
My query is:
Lately we have had repeated breakdowns in the power module of VVVF inverters, with the breaking of many IGBTs.
If sending pictures of IGBT damaged, you can know that may have caused the breakage, overvoltage or overcurrent?

thank you very much!


I hope that you can access the image

http://img111.images...22009139jk8.jpg
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http://img111.images...22009139jk8.jpg



#3 marke

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Posted 02 February 2009 - 05:50 PM

Hello JUAIAM

Welcome to the forum.

It is difficult to tell from the photograph exactly what has happened, but there appear to be a number of diodes damaged as well as the IGBT chips.
This suggests to me that there has been an overvoltage problem. There are symptoms of overcurrent also, but I suspect that the overcurrent is a result of the overvoltage damage.

Best regards,
Mark.

#4 JUAIAM

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Posted 03 February 2009 - 10:36 AM


Thanks for your reply. I attached a photo of the semiconductor as extracted. Maybe it is useful.
We also suspect that outside overvoltage. Since the formations using regenerative brake and does not rely on the substation.
Likewise if there are surges have not been observed with the voltimeter. Could affect the IGBT, overvoltage peak of short time?

Thanks again and excuse my grammatical errors, I use a web translator.





#5 JUAIAM

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Posted 03 February 2009 - 11:05 AM

Really is a very rare phenomenon, because the system has protection for overvoltage, we do not know that it can cause breakage.




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