Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
288
Figure 3-2 Trip circuit supervision with one binary input
This results in an upper limit for the resistance dimension, R
max
, and a lower limit R
min
, from which the optimal
value of the arithmetic mean R should be selected:
In order that the minimum voltage for controlling the binary input is ensured, R
max
is derived as:
So the circuit breaker trip coil does not remain energized in the above case, R
min
is derived as:
I
BI (HIGH)
Constant current with activated BI ( = 0.25 mA)
V
BI min
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)
V
CTR
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
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