ABB RELION 670 Series Commissioning Manual page 98

Section 10
Testing functionality by secondary injection
The following formula can be used to calculate SCB reactive power in per-unit system when
current with different frequency from the rated frequency is injected.
[ ]
Q pu
EQUATION2273 V1 EN-US
Harmonic voltage overload feature
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
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).
92
Note that operation of this feature is based on injected current and internally
calculated true RMS values. That means that this feature is also able to operate
for current signals with varying frequency. However due to relatively complex
calculation procedure it is recommended to do secondary tests only with
fundamental frequency current signals.
f
[ ]
= × 2
rated I pu
f
injected
Note that during testing the harmonic voltage overload feature the reactive
power overload feature or overcurrent feature may also give start and operate
signals depending on their actual settings. Therefore it is recommended to
switch them off during this test.
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).
1.2 1.3 1.4
300 60 15
1MRK 505 339-UEN B
(Equation 13)
GUID-3C6B2C73-026D-4173-BD4D-1E7E9ADAE160 v3
1.7 2.0 2.2
1 0.3 0.12
GUID-FECBCAD4-16CE-4EFC-9869-9F6D98E2F721 v2
Commissioning manual