Siemens SIPROTEC 7SJ62 Manual page 395

This results in an upper limit for the resistance dimension, R
value of the arithmetic mean R should be selected:
In order that the minimum voltage for controlling the binary input is ensured, R
So the circuit breaker trip coil does not remain energized in the above case, R
Constant current with activated BI ( = 1.8 mA)
I
BI (HIGH)
V minimum control voltage for BI
BI min
(= 19 V for delivery setting for nominal voltage of 24/48/60 V;
88 V for delivery setting for nominal voltage of 110/125/220/250 V)
V Control Voltage for Trip Circuit
CTR
R DC resistance of circuit breaker trip coil
CBTC
V Maximum voltage on the circuit breaker trip coil that does not lead to tripping
CBTC (LOW)
If the calculation results in R
old V , and this threshold must be implemented in the relay using plug-in jumpers (see Section „Hardware
BI min
Modifications").
For the power consumption of the resistance:
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
< R , the calculation must be repeated, with the next lowest switching thresh-
max min
Mounting and Commissioning
3.1 Mounting and Connections
, and a lower limit R , from which the optimal
max min
is derived as:
max
is derived as:
min
395