Siemens 6MD85, Manual

Page: 971 / 1256

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Figure 8-30 Principle of Trip-Circuit Supervision with 1 Binary Input
CR Command relay
CB Circuit breaker (closed)
CB coil Circuit-breaker coil
AuxCon1 Circuit-breaker auxiliary contact (closed when CB is closed)
AuxCon2 Circuit-breaker auxiliary contact (open when CB is closed)
V-Ctrl Control voltage (tripping voltage)
V-BI Input voltage for binary input
R Equivalent resistance
The supervision with 1 binary input identifies disruptions in the trip circuit and the failure of the control
voltage.
In normal operation, the binary input is activated with the command relay open and the trip circuit intact (H).
The supervision circuit is closed with the equivalent resistance R or with the auxiliary contact AuxCon1 of the
closed circuit breaker. The binary input is not activated while the command relay is closed (L). If the binary
input is not activated for a prolonged time, there is a disruption in the trip circuit or the control voltage has
failed.
No
. Command
Relay CB AuxCon1 AuxCon2 BI Dynamic State Static State
1 Open ON Closed Open H Normal operation with closed circuit breaker
2 Open OFF Open Closed H Normal operation with open circuit breaker
3 Closed ON Closed Open L Transmission or fault Fault
4 Closed OFF Open Closed L CR successfully activated the circuit breaker
Use the parameter
Blk.by trip/open cmd from
to set the conditions under which the trip-circuit super-
vision is blocked. The following conditions can cause a blocking of the trip-circuit supervision function:
•
The
Trip/open cmd.
of the circuit breaker is activated.
•
One of the trip commands of the circuit-breaker failure protection is activated.
As long as the trip-circuit supervision function is blocked, the closed contact of the command relay does not
cause a failure indication.
If the command contacts of other devices work in parallel on the trip circuit, the failure indication must be
delayed. With the
Alarm delay
parameter, you can set the time delay. After fixing the fault in the trip
circuit, the failure indication will automatically expire after the same time.
Supervision Functions
8.3 Supervision of the Secondary System
SIPROTEC 5, High-Voltage Bay Controller, Manual 971
C53000-G5040-C015-9, Edition 11.2017