3 Mounting and Commissioning
344
7UT613/63x Manual
C53000-G1176-C160-2
R
CBTC
DC resistance of circuit breaker trip coil
U
CBTC (LOW)
maximum voltage on the circuit breaker trip coil that does not lead to
tripping
If the calculation results in R
max
< R
min
, then the calculation must be repeated with the
next lower switching threshold U
BI
min, and this threshold must be implemented in the
relay using plug-in jumpers.
For the power consumption of the resistor the following applies:
Example
I
BI (HIGH)
1.7 mA (SIPROTEC 4 device 7UT613/63x)
U
BI min
19 V for delivery setting for nominal voltages of 24/48/60 V
(SIPROTEC 4 device 7UT613/63x)
73 V for delivery setting for nominal voltages of 110/125/220/250 V
(SIPROTEC 4 device 7UT613/63x)
U
CTR
110 V (from system / trip circuit)
R
TC
500 Ω (system / trip circuit)
U
CBTC (LOW)
2 V (from system / trip circuit)
R
max
= 53 kΩ
R
min
= 27 kΩ
The closest standard value of 39 kΩ is selected; the power is:
P
R
≥ 0.3 W
RTD-Box If the overload protection operates with processing of the coolant temperature (over-
load protection with hot-spot calculation), one or two RTD boxes 7XV5662-xAD can
be connected to the serial service interface at port C.
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