ABB Relion 670 Series Applications Manual page 229

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1MRK 511 401-UEN Rev. K

Voltage differential protection VDCPTOV

Identification

Function description

Voltage differential protection

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

IEC06000390 V3 EN-US

Figure 103: Connection of voltage differential protection VDCPTOV function to detect

VDCPTOV 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

Bay control REC670

Application manual

shows some different alternative connections of this function.

unbalance in capacitor banks (one phase only is shown)

identification

Single earthed wye

IEC06000390_1_en.vsd

Voltage protection

SEMOD153860-1 v2

SEMOD167723-2 v2

ANSI/IEEE C37.2

device number

SEMOD153893-5 v4

Relion rec670