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Figure 2-59
Principle of the trip circuit supervision with two binary inputs
TR
Trip relay contact
CB
Circuit breaker
TC
Circuit breaker trip coil
Aux1
Circuit breaker auxiliary contact (NO contact)
Aux2
Circuit breaker auxiliary contact (NC contact)
U-CTR
Control voltage (trip voltage)
U-BI1
Input voltage of 1st binary input
U-BI2
Input voltage of 2nd binary input
Supervision with two binary inputs not only detects interruptions in the trip circuit and loss of control voltage,
it also supervises the response of the circuit breaker using the position of the circuit breaker auxiliary contacts.
Depending on the conditions of the trip contact and the circuit breaker, the binary inputs are activated (logical
condition “H” in the following table), or short-circuited (logical condition “L”).
A state in which both binary inputs are not activated (“L”) is only possible in intact trip circuits for a short tran-
sition period (trip relay contact closed but circuit breaker not yet open).
A continuous state of this condition is only possible when the trip circuit has been interrupted, a short-circuit
exists in the trip circuit, a loss of battery voltage occurs, or malfunctions occur with the circuit breaker mecha-
nism. Therefore, it is used as supervision criterion.
Table 2-6
Condition table for binary inputs, depending on RTC and CB position
No
.
Trip Contact
Circuit Breaker
Aux 1
Aux 2
BI 1 BI 2 Dynamic State Static State
1
open
ON
closed
open
H
L
Normal operation with circuit
breaker closed
2
open
OFF
open
closed
H
H
Normal operation with circuit
breaker open
3
closed
ON
closed
open
L
L
Transition or
malfunction
Malfunction
4
closed
OFF
open
closed
L
H
TR has tripped successfully
The conditions of the two binary inputs are checked periodically. A query takes place about every 500 ms. If
three consecutive conditional checks detect an abnormality, a fault indication is output (see
repeated measurements determine the delay of the alarm message and avoid that an alarm is output during
Functions
2.7 Monitoring Functions
SIPROTEC 4, 7VK61, Manual
145
C53000-G1176-C159-5, Edition 05.2018
Содержание SIPROTEC 4 7VK61
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