Siemens Siprotec 7VK61 Manual page 183

This results in an upper limit for the resistance dimension, R
value of the arithmetic mean R should be selected:
In order that the minimum voltage for controlling the binary input is ensured, R
To keep the circuit breaker trip coil not energized in the above case, R
I
BI (HIGH)
U
BI min
U
CTR
R
TC
U
CBTC (LOW)
If the calculation results that R
threshold U
BI min
ware Modifications").
For the power consumption of the resistance the following applies:
Example:
I
BI (HIGH)
U
BI min
U
ST
R
CBTC
U
CBTC (LOW)
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Constant current with activated BI ( = 1.8 mA)
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 V; 176 V for
delivery setting for nominal voltage of 220/250 V)
Control voltage for trip circuit
DC resistance of circuit breaker trip coil
Maximum voltage on the circuit breaker trip coil that does not lead to tripping
< R , then 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 „Hard-
1.8 mA (SIPROTEC 4 7VK61)
19 V for delivery setting for nominal voltage of 24/48/60 V (from the 7VK61);
88 V for delivery setting for nominal voltage 110/125/220/250 V (from 7VK61);
176 V for delivery setting for nominal voltage of 220/250 V (from the 7VK61)
110 V (system / trip circuit)
500 Ω (system / trip circuit)
2 V (system / trip circuit)
Mounting and Commissioning
3.1 Mounting and Connections
, and a lower limit R , from which the optimal
max min
is derived as:
max
is derived as:
min
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