Siemens SIPROTEC 7RW80 Manual page 143

I
BI (HIGH)
V
BI min
V
CTR
R
CBTC
V
CBTC (LOW)
If the calculation has the result R
. This threshold is determined via the parameters 220 Threshold BI 1 to 226 Threshold BI 7 The
V
BI min
settings Thresh. BI 176V, Thresh. BI 88V, Thresh. BI 19V are possible.
For the power consumption of the resistance:
Example
I
BI (HIGH)
V
BI min
V
CTR
R
CBTC
V
CBTC (LOW)
The closest standard value 200 kΩ is selected; the following applies for the power:
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
Constant current with activated BI ( = 0.25 mA)
Minimum control voltage for BI (= 19 V at delivery setting for nominal voltages of 24
V/ 48 V; 88 V at delivery setting for nominal voltages of 60 V/ 110 V/ 125 V/ 220 V/
250 V)
Control voltage for trip circuit
Ohmic resistance of the circuit breaker coil
Maximum voltage on the circuit breaker coil that does not lead to tripping
< R , the calculation has to be repeated with the next smaller threshold
max min
0.25 mA (SIPROTEC 4 7RW80)
19 V at delivery setting for nominal voltages of 24 V/ 48 V; 88 V at delivery setting
for nominal voltages of 60 V/ 110 V/ 125 V/ 220 V/ 250 V)
110 V (from the system / trip circuit)
500 Ω (from the system / trip circuit)
2 V (from the system / trip circuit)
Mounting and Commissioning
3.1 Mounting and Connections
143