103
Two step time delayed phase overcurrent
protection (TOC2)
Chapter 10
Verifying settings by secondary
injection
3. Increase the current 10% and check that the operation time is
equal to tMin.
4. Set tLow to the correct value and check with a high current
that the operation time is equal to tMin+tLow.
20.1.4 Measuring the operate limit of the high step overcurrent protection
1. Set temporarily tHigh=0.000 s.
2. Inject a phase current slightly smaller than the operation val-
ue I>High.
3. Increase the current slowly and check the operation value by
observing when the signal TOC2-TRHS appears.
4. Compare the result of the measurement with the set value.
5. Set tHigh to the correct value.
6. Set a current 1.5 times I>High on the injection test equipment
7. Switch the current on and compare the operation time with
the set value tHigh.
20.2 Completing the test
Continue to test another function or complete the test by setting the test mode to off.
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