Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
273
To keep the circuit breaker trip coil not energized in the above case, R
min
is derived as:
If the calculation results that R
max
< R
min
, then the calculation must be repeated, with the next lowest switching
threshold U
BI min
, and this threshold must be implemented in the relay using plug-in jumpers (see Section „Hard-
ware Modifications“).
For the power consumption of the resistance the following applies:
Example:
The closest standard value of 39 kΩ is selected; the power is:
I
BI (HIGH)
Constant current with activated BI ( = 1.8 mA)
U
BI min
Minimum control voltage for BI
17 V for delivery setting for nominal voltages of 24/48/60 V;
73 V for delivery setting for nominal voltages of 110/125/220/250 V;
154 V for delivery setting for nominal voltages of 220/250 V
U
CTR
Control voltage for trip circuit
R
TC
DC resistance of circuit breaker trip coil
U
CBTC (LOW)
Maximum voltage on the circuit breaker trip coil that does not lead to tripping
I
BI (HIGH)
1.8 mA (SIPROTEC 4 7SD610)
U
BI min
17 V for delivery setting for nominal voltages of 24/48/60 V
(from the device 7SD610);
73 V for delivery setting for nominal voltages110/125/220/250 V
(from the device 7SD610);
154 V for delivery setting for nominal voltages 220/250 V
(from the device 7SD610)
U
ST
110 V (system / trip circuit)
R
CBTC
500 Ω (system / trip circuit)
U
CBTC (LOW)
2 V (system / trip circuit)
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