Test of function operation for intermittent EF
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1. Change the following settings from the default values:
• OperationMode = Start and Trip in order to obtain the trip signal
• IN>=5% (default value)
• IMinForward=2.5% (use the default value)
• UN>StartsNo=4 (default, but it can be changed if required)
• tReset=5.0s (set maximum value in order to make the test process easier)
2. Inject manually the following analogue quantities given in secondary amperes and volts but only for
100ms (in order to avoid STFW signal which is delayed for 150ms):
IN Magnitude=75mA; Angle=180 degrees
UN Magnitude=100V; Angle=0 degrees
3. Within the reset time (that is 5s with above setting) re-apply the above quantities again for 100ms
and repeat this step for at least the same number of times as set under setting UN>StartsNo (at
least 4 times with above settings).
4. The following signals are given from the APPTEF function:
• STUN at the beginning of every injection period of 100ms.
• WRNFW at the beginning of every injection period of 100ms
• STFW and STIEF appear after the fourth injection period of 100ms (when UN>StartsNo =4
as set above)
• TRIP comes after 2s (set tTrip time) after the STFW signal has appeared
The dead time between two set injection pulses of 100ms is less than the set
tReset time, otherwise the function does not operate.
11.5.19.2 Completing the test
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Continue to test another function or end the test by navigating to Main menu/Test/IED test mode/
TESTMODE: 1 and change the IEDTestMode setting to Off. Restore connections and settings to their
original values, if they were changed for testing purposes.
11.6 Voltage protection
SEMOD53540-1 v1
11.6.1 Two step undervoltage protection UV2PTUV (27)
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Prepare the IED for verification of settings as outlined in section
"Requirements" and section "Preparing
for test" in this chapter.
11.6.1.1 Verifying the settings
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Verification of pickup value and time delay to trip for Step 1
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Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
204 Transformer protection RET670
Commissioning manual
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