ABB Relion 670 Series Commissioning Manual page 123

1MRK 511 403-UEN E
The following points on the inverse curve are defined per relevant IEC/ANSI standards for time
multiplier value set to
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 L1only.
2. Check that function binary output signals STHIDML1 and STHOL 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 L1, on the local HMI under Main menu/Test
is approximately
6. Check that service value for voltage across SCB in phase L1, 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 L2 and phase L3.
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 operate 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 V1 EN-US
Above procedure can also be used to test definite time step. Pay attention that IDMT step can
also operate 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
kHOLIDMT =1.0
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 operate for current
signals with varying frequency.
411A (that is, 0.822A · (500/1) = 411A).
f
[ ]
%
= injected ×
U
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
1 0.3
GUID-FECBCAD4-16CE-4EFC-9869-9F6D98E2F721 v2
(Equation 14)
Section 11
2.2
0.12
117