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How is a ground fault measured on a Tesys T device?

Published date: 27 February 2020

Issue: 
How tesys T measures ground faults using internal or external ground fault detection.

Product Line:
LTMR, Tesys T 

Environment:
All

Cause:
Ground faults

Resolution:
Internally, it checks for ground faults by summing the three phase current signals from the secondary of the internal current transformers
Externally, by measuring the current delivered by the secondary of an external ground fault current transformer.
Default is internal on our devices.

Internal:
A warning when the summed current exceeds a set threshold
A fault when the summed current continuously exceeds a threshold for a set period of time.

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