ABB Relion 670 Series Applications Manual page 276

Section 10
Unbalance protection
Name
UNUnbal>
Curve Type
tDefTrip
tMin
tReset
k
tPCrv
tACrv
tBCrv
tCCrv
tDCrv
CrvSat
If the failure of the elements or the units results in the neutral unbalance voltage of at least 1%
of UBase, the SCUVPTOV function detects the fault.
10.4.4.2 Example of an internally fused ungrounded single WYE configuration
Single line diagram for the internally fused ungrounded single WYE capacitor bank with the
relevant application data are shown in
IEC19000930 V1 EN-US
Figure 130: Single line diagram for an ungrounded single WYE capacitor bank
270
Figure 130
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Default value
9.0% of UBase
Programmable
0.1
0.10
0.02
0.05
1.000
1.000
1.00
0.0
0.000
0.000
and Figure 131.
Preprocessing Preprocessing
Function Block Function Block
SMAI SMAI SMAI
GRP1L x G1A I3P
SMAI SMAI SMAI
GRP2N G2AI3P
Where x = 1 , 2, an d 3
1MRK 511 401-UEN Rev. K
GUID-0083B3F5-F6E4-4CC9-89B3-76F4BDA21634 v1
N N e e u u t t r r a a l l V V ol l t t a a g g e e
U U n n b b a a l l a a n n c c e e P P r r o o t t e e c c t t i i o o n n
SCUVPTOV SCUVPTOV SCUVPTOV
U3P U3P
U3NEUT U3NEUT
IED IED
IEC19000930 -1-en.vsdx
Bay control REC670
Application manual