Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
395
This results in an upper limit for the resistance dimension, R
max
, and a lower limit R
min
, from which the optimal
value of the arithmetic mean R should be selected:
In order that the minimum voltage for controlling the binary input is ensured, R
max
is derived as:
So the circuit breaker trip coil does not remain energized in the above case, R
min
is derived as:
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:
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 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
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