6.5.2 Overfrequency protection SAPTOF (81)
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to verify
settings".
Values of the logical signals for SAPTOF (81) are available on the local HMI under Main
menu/Tests/Function status/Frequency/SAPTOF(81,f>)/SAPTOF:X. The Signal
Monitoring in PCM600 shows the same signals that are available on the local HMI.
6.5.2.1 Verifying the settings
Verification of PICKUP value and time delay to operate
1. Check that the IED settings are appropriate, for example the pickup value and the
time delay.
2. Supply the IED with three-phase voltages at their rated values and initial frequency.
The initial frequency is calculated using Equation
21.
0.02 /0.04 0.04
r
StartFrequency floor f StartFrequency
IECEQUATION16061 V1 EN (Equation 21)
[2]
3. Slowly increase the voltage frequency by steps of 40 mHz until the PICKUP signal
appears; during each step apply the voltage signal for a time that is either at least 10%
longer than (tDelay+100 ms) or a suitable time to monitor the function.
4. Note the frequency value at which the PICKUP signal appears and compare it with
the set value StartFrequency.
5. Decrease the frequency until its rated value is reached.
6. Check that the PICKUP signal resets.
7. Supply the IED with three-phase voltages at their rated values and frequency 20
mHz under the set value StartFrequency.
8. Increase the frequency with a 40 mHz step, applying it for a time that is at least 10%
longer than (tDelay+100 ms).
9. Measure the time delay of the TRIP signal, and compare it with the set value tDelay.
Note that the measured time consists of the set value of the time delay plus the
minimum trip time of the function (80 - 90 ms).
Extended testing
[2] floor[
x
] is the largest integer less than or equal to
x
1MRK 505 293-UUS A Section 6
Testing functionality
83
Commissioning manual
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