Siemens SIPROTEC 4 7UT6 Series Manual page 313

U-R Voltage across the substitute resistor
R Bypass resistor
This results in an upper limit for the resistance dimension, R
value of the arithmetic mean R should be selected:
[mi-ausloesekreis-widerstand1-021026-rei, 1, en_GB]
In order that the minimum voltage for controlling the binary input is ensured, R
[mi-ausloesekreis-widerstand2-021026-rei, 1, en_GB]
So the circuit breaker trip coil does not remain energized in the above case, R
[mi-ausloesekreis-widerstand3-021026-rei, 1, en_GB]
Ι
BI (HIGH)
U
BI min
U
CTR
R
TC
U
TC (LOW)
If the calculation results in R
threshold U
BI min
For the power consumption of the resistor the following applies:
[mi-ausloesekreis-leistung-021026-rei, 1, en_GB]
Example
Ι
BI (HIGH)
U
BI min
U
CTR
R
TC
U
TC (LOW)
[mi-ausloesekreis-beispwiderstand1-021026-rei, 1, en_GB]
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Constant Current with BI on (= 1.7 mA)
Minimum control voltage for BI (= 19 V for delivery setting for nominal
voltage of 24 V/48 V/60 V; 88 V for delivery setting for nominal voltage
of 110 V/125 V/220 V/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 lower switching
max min
, and this threshold must be implemented in the relay using plug-in jumpers.
1.7 mA (SIPROTEC 4 device 7UT6x)
19 V for delivery setting for nominal voltages of 24 V/48 V/60 V
(SIPROTEC 4 device 7UT6x)
88 V for delivery setting for nominal voltages of 110 V/125 V/220 V/
250 V (SIPROTEC 4 device 7UT6x)
110 V (from system / trip circuit)
500 Ω (from system / trip circuit)
2 V (from 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
313