Table of Contents
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Section 11
Testing functionality by secondary injection
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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210
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 U3P 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 = ON
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
•
•
1MRK 504 165-UEN Rev. K
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
Transformer protection RET670
Commissioning manual
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