100
3
UDIFLx
PUDIFLx
UBase
=
´
IECEQUATION19376 V1 EN-US
(Equation 31)
Verifying the function in Ungrounded mode
GUID-069FCF45-61B1-486C-8C0E-D1CC66B3BB3F v1
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:
•
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
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.
Changes after step 2
Expected output
4-a*
Inject constant bus voltages of U
L1
= 63.51
V at 0°, U
L2
= 63.51 V at 240°, and U
L3
=
63.51 V at 120° in secondary at rated
UL1, UL2, and UL3 should show
230.94 kV
4-b
Inject constant tap voltage of U
TapL1
=
31.75 V in secondary at rated frequency
UTAPL1 should show 115.47 kV
4-c
Inject constant neutral voltage of U
N
= 1 V
in secondary at rated frequency
UNSCB should show 36.63 kV
RESETCOMP Test
4-d
Activate binary input RESETCOMP for 1 s
USEDURATL1 should show 0.5
(
VoltRatioL1
)
TRIGCOMP Test
4-e
Inject U
TapL1
= 31.75 V in secondary at
rated frequency
•
DIFURATL1 should become
HIGH
•
URATIOL1 and USEDURATL1
should show 0.492 and 0.5
respectively
4-f * *
Activate binary input TRIGCOMP for 1 s
•
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
Table continues on next page
Section 11
1MRK 511 403-UEN Rev. L
Testing functionality by secondary injection
138
Bay control REC670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
Summary of Contents for REC670
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