Voltage Differential Protection Vdcptov; Identification; Application - ABB Relion REC670 Applications Manual

Section 8
Voltage protection
8.4

Voltage differential protection VDCPTOV

8.4.1

Identification

Function description
Voltage differential protection
8.4.2

Application

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
Ph L3
IEC06000390 V3 EN-US
Figure 81: Connection of voltage differential protection VDCPTOV function to detect
186
81 shows some different alternative connections of this function.
U1
Ud>L1
U2
Ph L3
Ph L2
unbalance in capacitor banks (one phase only is shown)
IEC 61850 IEC 60617
identification identification
VDCPTOV -
Single earthed wye
Ph L2
Ud>L1
U1 U2
Ph L3
1MRK 511 358-UEN A
ANSI/IEEE C37.2
device number
60
Double wye
Ph L2
IEC06000390_1_en.vsd
Application manual
SEMOD153860-1 v2
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SEMOD153893-5 v3