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1MRK 505 372-UEN Rev. K
1.
Inject SCB rated current (that is, 0.587A at 50Hz for this SCB) in all three phases.
2.
Lower phase L1 current 10% under the set value for setting parameter IUC< (that is, 0.9 · 0.7 ·
0.587A = 0.370A at 50Hz for this SCB).
3.
Check that function binary output signals STUCL1 and STUC are set to one.
4.
Check that function binary output signals TRUC and TRIP are set to one after the set time
under parameter tUC (for example, 5s for this SCB) has expired.
5.
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.
6.
Check that service value from the function for current in phase L1, on the local HMI under Main
menu /Test is approximately 185A (that is, 0.370A · (500/1) = 185A).
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
because they will be automatically blocked by operation of built-in reconnection inhibit feature.
9.
Repeat above steps 1-8 for phase L2 and phase L3.
Reactive power overload feature
1.
Inject current equal to the set reactive power overload pickup level under setting parameter
QOL> (that is, 1.3 · 0.587A = 0.763A at 50Hz for this SCB) in phase L1 only.
2.
Check that function binary output signals STQOLL1 and STQOL are set to one.
3.
Check that function binary output signals TRQOL and TRIP are set to one after the set time
under parameter tQOL (for example, 60s for this SCB) 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 from the function for current in phase L1, on the local HMI under Main
menu /Test is approximately 382A (that is, 0.763A · (500/1) = 382A).
6.
Check that service value from the function for reactive power in phase L1, on the local HMI
under Main menu /Test is approximately 169% (that is, 1.3 · 1.3 = 1,69pu = 169%).
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.
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
Busbar protection REB670
Commissioning manual
Note that during testing the reactive power overload feature the harmonic voltage
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.
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
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Section 10
Testing functionality by secondary injection
GUID-6DA88E90-366A-494F-B3A4-F8B5A3FD6396 v3
(Equation 13)
97
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