Siemens SIPROTEC 7SJ61 - Page 261

Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
261
If the calculation results in R
max
< R
min
, the calculation must be repeated, with the next lowest switching thresh-
old V
BI min
, and this threshold must be implemented in the relay using plug-in jumpers (see Section „Hardware
Modifications“).
For the power consumption of the resistance:
Example:
I
BI (HIGH)
Constant current with activated BI ( = 1.8 mA)
V
BI min
minimum control voltage for BI
(= 19 V for delivery setting for nominal voltage of 24/48/60/125 V;
88 V for delivery setting for nominal voltage of 110/125/220/250 V)
V
CTR
Control Voltage for Trip Circuit
R
CBTC
DC resistance of circuit breaker trip coil
V
CBTC (LOW)
Maximum voltage on the circuit breaker trip coil that does not lead to tripping
I
BI (HIGH)
1.8 mA (SIPROTEC 4 7SJ61)
V
BI min
19 V for delivery setting for nominal voltage of 24/48/60/125 V (device 7SJ61)
88 V for delivery setting for nominal voltage of 110/125/220/250 V (device 7SJ61)
V
CTR
110 V (system / release circuit)
R
CBTC
500 Ω (from system / trip circuit)
V
CBTC (LOW)
2 V (system / release circuit)