Figure 3.43-1 CTS criterion logic diagram
3.43.3 Protection Principle
This is a backup function of CT circuit failure criterion.
Each side of the device is furnished with CT circuit failure alarm element
To prevent incorrect tripping of zero-sequence overcurrent protection caused by CT circuit failure
or anomaly, the device is provided with CT circuit failure judgment element using the following
criterion:
=10V: zero-sequence voltage
CT circuit failure will be deemed to have occurred once the situation that meets above-noted
criterion lasting for 10s.
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