Voltage Differential Protection Vdcptov (60); Identification; Application - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
8.4

Voltage differential protection VDCPTOV (60)

8.4.1

Identification

Function description
Voltage differential protection
8.4.2

Application

The Voltage differential protection VDCPTOV (60) 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
shows some different alternative connections of this function.
Ph C
ANSI06000390 V1 EN-US
Figure 94: Connection of voltage differential protection VDCPTOV (60) function to detect
Application manual
V1
Vd>L1
V2
Ph C
V1
Ph B
unbalance in capacitor banks (one phase only is shown)
IEC 61850 IEC 60617
identification identification
VDCPTOV -
Single grounded wye
Ph B
Vd>A
V2
Ph C
en06000390_ansi.vsd
ANSI/IEEE C37.2
device number
60
Double wye
Ph B
Section 8
Voltage protection
SEMOD153860-1 v2
SEMOD167723-2 v2
SEMOD153893-5 v3
94
213