ABB Relion 670 Series Commissioning Manual page 125

1MRK 511 403-UUS Rev. K
Procedure to test inverse time delayed step:
The following points on the inverse curve are defined per relevant IEC/ANSI standards for time multiplier
value set to k_HOL_IDMT=1.0
UpeakRMS [pu]
Time [s]
Here will be shown how to test the fourth point from the above table. Other points can be tested in the
similar way:
1. Inject 140% of the base current (that is, 1.4 · 0.587A = 0.822A at 50Hz for this SCB) in phase
Aonly.
2. Check that function binary output signals PU_HOL_IDMT_A and PU_HOL are set to one.
3. Check that function binary output signals TRHOL and TRIP are set to one after the expected time
(for example, 15s for this voltage level in accordance with the above table) has expired.
4. If any of these signals are used for tripping, signaling and/or local/remote indication, check that all
relevant contacts and LEDs have operated and that all relevant GOOSE messages have been
sent.
5. Check that service value for current in phase A, on the local HMI under Main menu /Test is
approximately 411A (that is, 0.822A · (500/1) = 411A).
6. Check that service value for voltage across SCB in phase A, on the local HMI under Main menu /
Test is approximately 140%.
7. Stop injection of all currents (that is, set all currents back to 0A).
8. Check that all above mentioned function binary output signals now have logical value zero.
9. Repeat above steps 1 - 8 for phase B and phase C.
10. Repeat above steps 1 - 8 to test different points from the above table.
Operation of this feature is based on internally calculated peak RMS voltage value. That means that this
feature is also able to trip for current signals with varying frequency. Note that for the fundamental
frequency injection, internally calculated voltage in percent corresponds directly to the injected current
value given in percent. However if it is required to test IDMT characteristic with a varying frequency, the
magnitude of the injected current must be adjusted accordingly. The following formula can be used to
calculate required current RMS value in percent at the desired injection frequency in order to archive
voltage percentage value given in the above table:
[ ]
=×
I %
inj
EQUATION2274-ANSI V1 EN-US
Above procedure can also be used to test definite time step. Pay attention that IDMT step can also trip
during such injection. Therefore make sure that appropriate settings are entered in order to insure correct
test results for definite time step.
Bay control REC670
Commissioning manual
1.15
1800
Note that operation of this feature is based on internally calculated voltage peak RMS
value. That means that this feature is also able to trip for current signals with varying
frequency.
f
[ ]
%
injected
.V
f
rated
Note that it is recommended to test IDMT operating times by injected current with the
rated frequency.
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1.2 1.3 1.4
300 60 15
Testing functionality by secondary injection
1.7 2.0 2.2
1 0.3 0.12
GUID-FECBCAD4-16CE-4EFC-9869-9F6D98E2F721 v2
(Equation 14)
Section 11
119