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1MRK 511 409-UUS Rev. K
7.
Check the inverse time delay by injecting a voltage corresponding to 1.2 × Vpickup>.
8.
Repeat the test to check the inverse time characteristic at different over-voltage levels.
9.
Repeat the above described steps for Step 2 of the function.
11.5.2.2
Extended testing
1.
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
11.5.2.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.6
Frequency protection
11.6.1
Underfrequency protection SAPTUF (81)
Prepare the IED for verification of settings outlined in Section
11.6.1.1
Verifying the settings
Verification of PICKUP value and time delay to trip
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 94.
StartFrequency
IECEQUATION16059 V1 EN-US
3.
Slowly decrease the voltage frequency bysteps of 40 mHz until the TRIP signal appears; during
each step apply the voltage signal for a time that is either at least 10% longer than (tDelay+100ms)
or a suitable time to monitor the function.
4.
Note the frequency value at which the START signal appears and compare it with the set value
StartFrequency.
5.
Note the frequency value at which the TRIP signal appears and compare it with the set value
StartFrequency.
6.
Increase the frequency until its rated value is reached.
7.
Check that the PICKUP signal resets.
8.
Supply the IED with three-phase voltages at their rated values and frequency 20 mHz over the set
value StartFrequency.
9.
Decrease the frequency with a 40 mHz step, applying it for a time that is at least 10% longer than
(tDelay+100ms).
10.
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 pickup
start function (80 - 90 ms).
Phasor measurement unit RES670
Commissioning manual
0.02
floor f
StartFrequency
r
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Testing functionality by secondary injection
"Preparing the IED to verify
/ 0.04
0.04
Section 11
GUID-BE4B4A36-CCEE-4020-B7DC-6A83A43D11F5 v2
M13806-43 v6
SEMOD53547-1 v1
M16289-2 v7
settings".
M16289-15 v3
M16289-17 v7
(Equation 94)
121
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