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27.1.4
27.2
150
Two step time delayed non-directional phase
overcurrent protection (TOC2)
4.
Set tLow to the correct value and check with a high current that the
operation time is equal to tMin+tLow.
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 value
I>High.
3.
Increase the current slowly and check the operation value by observ-
ing 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.
Completing the test
Continue to test another function or complete the test by setting the test mode to off. Restore
connections and settings to the original values, if they were changed for testing purpose.
Chapter 13
Verifying settings by secondary
injection
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