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Old 8th Apr 2021, 7:57 pm   #2
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 6,779
Default Re: Current transformer termination best practice - a theoretical situation

Hi Al, in power system practice it is nor unknown for a CT sec to become disconnected on a metering application. The usual trick was to fit a voltage dependent resistor (varistor, etc across the terminals and heatsink this device. Quite a bit of power can be dissipated in this device and it was normal to fit a latching thermal switch onto the heatsink with spare contact to operate an alarm.
Note that a zener will not work well in this position

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