²
To check the efficiency of the reverse-power protection on the basis of the indications, use the parameter
(_:991:1) Mode to switch the reverse-power protection to test .
Proceed as follows:
²
Start the generator and synchronize it with the power system.
²
Close the control valves.
²
From the functional measured value, take the reverse power that was measured by the protection device
as the active power. Use 50 % of the functional measured value as setting value for the reverse-power
protection.
²
Increase the driving power up to normal operation.
²
Check the quick-stop criterion.
Proceed as follows:
NOTE
Make sure that the binary input >Stop valve closed is properly routed. The quick-stop criterion (the
pressure-operated switch or the limit switch on the quick-stop valve) must control this binary input.
²
Close the quick-stop valve.
²
From the functional measured value P1avg , take the reverse power that was measured by the protec-
tion device as the active power.
²
If – contrary to expectations – this value is smaller than the reverse power when the control valves are
closed, take 50 % of this value as the setting value for the reverse-power protection.
²
Shut down the machine by activating the reverse-power protection. Set the parameter (_:991:1)
Mode to on .
Functional Tests
11.14 Reverse-Power Protection
1398 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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