ABB Relion 650 Series Applications Manual page 119

1MRK 505 287-UUS B
Table 13:
Operating voltage U
48 V DC
60 V DC
110 V DC
220 V DC
Due to the requirement that the voltage over the TCSSCBR contact must be 20V or higher, the
correct operation is not guaranteed with auxiliary operating voltages lower than 48V DC because
of the voltage drop in the R
voltage system which can cause too low voltage values over the TCSSCBR contact. In this case,
erroneous alarming can occur.
At lower (<48V DC) auxiliary circuit operating voltages, it is recommended to use the circuit
breaker position to block unintentional operation of TCSSCBR. The use of the position indication
is described earlier in this chapter.
Busbar protection REB650
Application manual
Values recommended for the external resistor R
c
and operating coil or even voltage drop of the feeding auxiliary
ext
© Copyright 2013 ABB. All rights reserved
ext
Shunt resistor R
ext
10 kΩ, 5 W
22 kΩ, 5 W
33 kΩ, 5 W
68 kΩ, 5 W
Section 9
Secondary system supervision
113