Author Topic: Using Steel Fasteners Near Tank Circuit Connections  (Read 702 times)

Offline Benjamin Lockhart

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Using Steel Fasteners Near Tank Circuit Connections
« on: June 17, 2023, 01:08:57 AM »
Just a quick question. Is it alright to use steel bolts to connect up the MMC and IGBTs for a large(CM300) DRSSTC as long as they're not directly in the path of current?

I'm wondering if they will get hot just from close proximity or in a lug terminal.

For example, will this be fine with a steel bolt and nut in the center?



Thanks, Benjamin
« Last Edit: June 17, 2023, 04:59:10 AM by Benjamin Lockhart »

Offline davekni

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Re: Using Steel Fasteners Near Tank Circuit Connections
« Reply #1 on: June 17, 2023, 10:03:36 PM »
Quote
Just a quick question. Is it alright to use steel bolts to connect up the MMC and IGBTs for a large(CM300) DRSSTC as long as they're not directly in the path of current?

I'm wondering if they will get hot just from close proximity or in a lug terminal.

For example, will this be fine with a steel bolt and nut in the center?
Short answer:  I don't expect any issues, but I have limited experience here.

Same question applies to bolts connecting bus bars to IGBT bricks.  I haven't heard of any need for copper bolts there.  If anyone has, please share.

My DRSSTC uses small bolts to connect lugs on my primary coil leads to corresponding lugs on MMC.  Bolt connections hang in open air.  Haven't had any issues with that.  I spent some time thinking about this question from a theoretical perspective.  Resulted in only guesses as to current flow distribution through such a connection based on skin effect and geometry and resulting flux through bolt head.  Certainly much less flux than for a bolt near primary coil.
David Knierim

Offline Late

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Re: Using Steel Fasteners Near Tank Circuit Connections
« Reply #2 on: July 18, 2023, 08:57:39 PM »
In my limited experience i think it should be fine. I used steel bolts to bolt on the busbars to MMC on my DRSSTC and I haven't encountered any issues with those bolts heating or anything. My DRSSTC runs at 900amp peak primary current.
Hi, my name is Patriks and I'm from Latvia. I'm interesting electronics, especially power electronics and high voltage. I also make content on YouTube showing my journey in the awesome world of High Voltage.

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Re: Using Steel Fasteners Near Tank Circuit Connections
« Reply #2 on: July 18, 2023, 08:57:39 PM »

 


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