Vd>L1
Ph BPh C
V1
V2
Vd>A
Ph BPh C
V1 V2
Ph C
Ph B
en06000390_ansi.vsd
Single grounded wye
Double wye
ANSI06000390 V1 EN-US
Figure 112: Connection of voltage differential protection VDCPTOV (60) function to
detect unbalance in capacitor banks (one phase only is shown)
VDCPTOV (60) function has a block input (BLOCK) where a fuse failure supervision
(or MCB tripped) can be connected to prevent problems if one fuse in the capacitor
bank voltage transformer set has opened and not the other (capacitor voltage is
connected to input V2). It will also ensure that a fuse failure alarm is given instead of a
Undervoltage or Differential voltage alarm and/or tripping.
8.4.3 Setting guidelines
SEMOD153915-5 v3
The parameters for the voltage differential function are set via the local HMI or
PCM600.
The following settings are done for the voltage differential function.
Operation: Off/On
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, VBase and SBase as applicable.
1MRK 505 370-UUS A Section 8
Voltage protection
Busbar protection REB670 2.2 ANSI 257
Application manual
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