Author Topic: Purpose of shorted CT through PCB?  (Read 787 times)

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Offline mlunaTopic starter

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Purpose of shorted CT through PCB?
« on: March 19, 2020, 12:53:32 am »
I was fixing an online UPS (APC brand), in which I came across this CT (ct2), shorted through the PCB on its primary.  I wonder what's the purpose of doing this if there's no way current flow trough it so it can be sensed.

 

Offline ahbushnell

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Re: Purpose of shorted CT through PCB?
« Reply #1 on: March 19, 2020, 01:03:04 am »
Good question.  Maybe the current divides between the trace and the transformer?  This allows a smaller transformer? 
 

Online Someone

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Re: Purpose of shorted CT through PCB?
« Reply #2 on: March 19, 2020, 01:15:06 am »
PCB trace as shunt.
 
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Offline David Hess

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Re: Purpose of shorted CT through PCB?
« Reply #3 on: March 20, 2020, 05:19:46 am »
Based on using all of the connector pins, the traces will operate as a shunt resistance across the current transformer.
 
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