VCTR Control voltage for trip circuit
R
CBTC
Ohmic resistance of the circuit breaker coil
V
CBTC (LOW)
Maximum voltage on the circuit breaker coil that does not lead to tripping
If the calculation results in R
max
< R
min
, the calculation must be repeated, with the next lowest switching
threshold 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:
[formel-leistungvon-r-260602-kn, 1, en_US]
Example:
Ι
BI (HIGH)
1.8 mA (vom SIPROTEC 4 7SJ61)
V
BI min
19 V for delivery setting for nominal voltages of DC 24 V/ 48 V/ 60 V/ 125 V
(of the device 7SJ61)
88 V for delivery setting for nominal voltages of DC 110 V to 220 V and AC 115 V bis 250 V
(of the device 7SJ61)
176 V for delivery setting for nominal voltages of DC 110 V to 220 V and AC 115 V bis 230 V
(of the 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)
[beispiel-rmax-150502-kn, 1, en_US]
[beispiel-rmin-150502-kn, 1, en_US]
[beispiel-rmittelwert-150502-kn, 1, en_US]
The closest standard value of 39 kΩ is selected; the power is:
[beispiel-leistungvonr-150502-kn, 1, en_US]
Hardware Modifications
General
Hardware modifications concerning, for instance, the control voltage for binary inputs or termination of serial
interfaces might be necessary. Follow the procedure described in this section, whenever hardware modifica-
tions are carried out.
3.1.2
3.1.2.1
Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC 4, 7SJ61, Manual 235
C53000-G1140-C210-6, Edition 05.2016
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