ABB Relion 670 Series Applications Manual page 232

Section 9
Voltage protection
9.4 Voltage differential protection VDCPTOV (60)
9.4.1 Identification
Function description
Voltage differential protection
9.4.2 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 101: Connection of voltage differential protection VDCPTOV (60) function to detect
226
V1
Vd>L1
V2
Ph C
V1
Ph B
unbalance in capacitor banks (one phase only is shown)
© Copyright 2017 ABB. All rights reserved
IEC 61850 IEC 60617
identification identification
VDCPTOV -
Single grounded wye
Ph B
Vd>A
V2
Ph C
en06000390_ansi.vsd
1MRK 511 401-UUS F
ANSI/IEEE C37.2
device number
60
Double wye
Ph B
Bay control REC670
Application manual
SEMOD153860-1 v2
SEMOD167723-2 v2
SEMOD153893-5 v3
101