8.4 Voltage differential protection VDCPTOV
SEMOD153860-1 v2
8.4.1 Identification
SEMOD167723-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage differential protection VDCPTOV - 60
8.4.2 Application
SEMOD153893-5 v3
The Voltage differential protection VDCPTOV functions can be used in some different
applications.
• Voltage unbalance protection for capacitor banks. The voltage on the bus is supervised
with the voltage in the capacitor bank, phase- by phase. Difference indicates a fault, either
short-circuited or open element in the capacitor bank. It is mainly used on elements with
external fuses but can also be used on elements with internal fuses instead of a current
unbalance protection measuring the current between the neutrals of two half’s of the
capacitor bank. The function requires voltage transformers in all phases of the capacitor
bank. Figure
117 shows some different alternative connections of this function.
Ud>L1
Ph L2Ph L3
U1
U2
Ud>L1
Ph L2Ph L3
U1 U2
Ph L3
Ph L2
Single earthed wye
Double wye
IEC06000390_1_en.vsd
IEC06000390 V3 EN-US
Figure 117: Connection of voltage differential protection VDCPTOV function to detect
unbalance in capacitor banks (one phase only is shown)
1MRK 505 370-UEN D Section 8
Voltage protection
Busbar protection REB670 217
Application manual
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