Hardware Modifications; General - Siemens SIPROTEC 4 7SJ61 Manual

VCTR Control voltage for trip circuit
R Ohmic resistance of the circuit breaker coil
CBTC
V Maximum voltage on the circuit breaker coil that does not lead to tripping
CBTC (LOW)
If the calculation results in R
threshold V
BI min

"Hardware Modifications").

For the power consumption of the resistance:
[formel-leistungvon-r-260602-kn, 1, en_US]
Example:
1.8 mA (vom SIPROTEC 4 7SJ61)
Ι
BI (HIGH)
V 19 V for delivery setting for nominal voltages of DC 24 V/ 48 V/ 60 V/ 125 V
BI min
(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 110 V (system / release circuit)
CTR
R 500 Ω (from system / trip circuit)
CBTC
V 2 V (system / release circuit)
CBTC (LOW)
[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]
3.1.2 Hardware Modifications
3.1.2.1

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.
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
< R , the calculation must be repeated, with the next lowest switching
max min
, and this threshold must be implemented in the relay using plug-in jumpers (see Section
Mounting and Commissioning
3.1 Mounting and Connections
235