Siemens SIPROTEC 7UT613 series Manual page 344

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