ABB Relion 670 Series Commissioning Manual page 149

1MRK 511 403-UUS Rev. K
• Grounded - Select this option by using the parameter setting SCBGndType, if the capacitor bank is
grounded.
• Ungrounded - Select this option by using the parameter setting SCBGndType, if the capacitor bank
is ungrounded.
Verifying the function in Grounded mode
Perform the following procedure to test the function in Grounded mode.
1. Set the following parameters:
•
•
•
•
•
•
•
•
2. Activate RESETCOMP input to ensure that the stored values are reset.
3. The expected output is monitored in the following path from the local HMI client: Main menu /Test/
Function status /Unbalance protection/CapBankPhaseVoltageDiff(87V, Ud>)/SCPDPTOV(87V,
Ud>):x/Outputs , where x = instance number.
4. Check the respective operation of warning, alarm, and trip.
Step no.
4-a*
4-b
4-c
4-d
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Bay control REC670
Commissioning manual
Ensure that the three-phase bus voltage and the tap voltage are connected to the
separate SMAI blocks and their outputs are connected to the V3P and U3PTAP inputs of
the SCPDPTOV function.
In case of ungrounded capacitor bank configuration, if the neutral voltage is available,
ensure that it is connected to the SMAI block and the SMAI output is connected to the
U3NEUT input of the SCPDPTOV function.
Operation = Enable
tDefWrn = 5 s; tDefAlm = 5 s; tDefTrip =5 s
SCBGndType = Grounded
Udif> =10% UB
UdifAlm> =8% UB
UdifWrn> =5% UB
UMin> =50% UB
VoltRatioL1 =0.5
Changes after step 2
Inject constant bus voltages of U
at 0°, U = 63.51 V at 240°, and U
L2
V at 120° in secondary at rated frequency
Inject constant tap voltage of U
in secondary at rated frequency
Activate binary input RESETCOMP for 1 s
Inject U = 24.25 V in secondary at rated
TapL1
frequency
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Expected output
= 63.51 V •
L1
= 63.51
L3
•
= 31.75 V UTAPL1 should show 115.47 kV
TapL1
RESETCOMP test
USEDURATL1 should show 0.5
(VoltRatioL1)
TRIGCOMP Test
Repeat Sub-step 4–a
•
•
Testing functionality by secondary injection
GUID-78835D73-AC7D-4D58-998F-82B5AFC2E8CD v1
UL1, UL2, and UL3 should
show 230.94 kV
UNSCB should show 0 kV
DIFURATL1 should
become HIGH
URATIOL1 and
USEDURATL1 should
show 0.382 and 0.5
respectively
Section 11
143