Hitachi RET670 Commissioning Manual page 218

Section 11
Testing functionality by secondary injection
PUDIFLx
IECEQUATION19376 V1 EN-US
Verifying the function in Ungrounded mode
The following procedures are performed to test the function in Ungrounded mode.
If there is a VT present in the neutral, then the setting NeutVoltMeas is set to available.
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
RESETCOMP Test
4-d
4-e
4-f * *
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212
UDIFLx
= ´
100
UBase 3
Operation = ON
tDefWrn = 5 s; tDefAlm = 5 s; tDefTrip =5 s
SCBGndType = Ungrounded
NeutVoltMeas = Available
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
V at 0°, U = 63.51 V at 240°, and U
L2
63.51 V at 120° in secondary at rated
Inject constant tap voltage of U
31.75 V in secondary at rated frequency
Inject constant neutral voltage of U
in secondary at rated frequency
Activate binary input RESETCOMP for 1 s
Inject U
TapL1
rated frequency
Activate binary input TRIGCOMP for 1 s
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= 63.51
L1
=
L3
=
TapL1
= 1 V
N
TRIGCOMP Test
Repeat Sub-step 4–a
= 31.75 V in secondary at
1MRK 504 165-UEN Rev. K
GUID-069FCF45-61B1-486C-8C0E-D1CC66B3BB3F v1
Expected output
UL1, UL2, and UL3 should show
230.94 kV
UTAPL1 should show 115.47 kV
UNSCB should show 36.63 kV
USEDURATL1 should show 0.5
(VoltRatioL1)
• DIFURATL1 should become
HIGH
• URATIOL1 and USEDURATL1
should show 0.492 and 0.5
respectively
• The output COMPEXED
should become HIGH for 100
ms and LASTCOMP output
should display the date and
time of compensation
• URATIOL1 and USEDURATL1
should show 0.406
• DIFURATL1 should become
LOW
Transformer protection RET670
Commissioning manual
(Equation 111)