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1MRK 504 165-UEN Rev. K
Step No.
5-a
5-b
5-c
* - VT ratios of the phase voltages and neutral voltages are considered as 400 kV/110 V. The value
UBase is considered as 110 V.
The voltage inputs U
11.7.4.2
Completing the test
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.
11.8
Frequency protection
11.8.1
Underfrequency protection SAPTUF
Prepare the IED for verification of settings outlined in Section
11.8.1.1
Verifying the settings
Verification of START value and time delay to operate
1.
Check that the IED settings are appropriate, for example the start 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 116.
StartFrequency
IECEQUATION16059 V1 EN-US
3.
Slowly decrease the voltage frequency by steps of 40 mHz until the START 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.
Increase the frequency until its rated value is reached.
6.
Check that the START signal resets.
Transformer protection RET670
Commissioning manual
Changes after step 4
Retain the constant voltages* of
U
= 63.5∠0° V, U
= 63.5∠240°
L1
L2
V, and U
= 63.5∠120° V in
L3
secondary at rated frequency.
Change U
= 3.0∠0° V in
N
secondary at rated frequency
Change U
= 4.0∠0° V in
N
secondary at rated frequency
START and TRIP TEST
Change U
= 6.0∠0° V in
N
secondary at rated frequency
, U
, and U
refer to bus voltages and U
L1
L2
L3
0.02
floor f
StartFrequency
r
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Expected Output
WARNING TEST
WARNING signal should become HIGH after the
set time delay.
ALARM TEST
ALARM signal should become HIGH after the set
time delay.
START signal should become HIGH.
TRIP signal should become HIGH after the set time
delay.
refers to the neutral voltage input.
N
"Preparing the IED to verify
/ 0.04
0.04
Section 11
Testing functionality by secondary injection
GUID-08826C79-B8D8-471B-AD82-906A999ED095 v1
SEMOD53547-1 v1
settings".
(Equation 116)
M16289-2 v7
M16289-15 v3
M16289-17 v7
217
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