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 291: Connection of voltage differential protection VDCPTOV function to
detect unbalance in capacitor banks (one phase only is shown)
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 set has opened and not the other (capacitor voltage is
connected to input U2). It will also ensure that a fuse failure alarm is given instead
of a Undervoltage or Differential voltage alarm and/or tripping.
Fuse failure supervision (SDDRFUF) function for voltage transformers. In many
application the voltages of two fuse groups of the same voltage transformer or fuse
groups of two separate voltage transformers measuring the same voltage can be
supervised with this function. It will be an alternative for example, generator units
where often two voltage transformers are supplied for measurement and excitation
equipment.
The application to supervise the voltage on two voltage transformers in the
generator circuit is shown in figure
292.
1MRK 506 369-UEN B Section 10
Voltage protection
Line distance protection REL670 2.2 IEC 553
Application manual
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