Description - Siemens SIPROTEC 7SK80 Manual
Motor protection
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Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (62 pages)
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2.10.2.1 Description
Supervision with Two Binary Inputs
When using two binary inputs, these are connected according to Figure 2-52, parallel to the associated trip
contact on one side, and parallel to the circuit breaker auxiliary contacts on the other.
Figure 2-52
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 Table 2-7), or not activated (logical condition "L").
In healthy trip circuits the condition that both binary inputs are not actuated ("L") is only possible during a short
transition period (trip contact is closed but the circuit breaker has not yet opened). 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 mechanism. Therefore, it is used as
supervision criterion.
Table 2-7
No.
Trip contact
1
2
3
4
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Principle of the trip circuit supervision with two binary inputs
Condition table for binary inputs, depending on RTC and CB position
Circuit breaker
Open
Closed
Open
Open
Closed
Closed
Closed
Open
52a Contact
52b Contact
Closed
Open
Open
Closed
Closed
Open
Open
Closed
Functions
2.10 Monitoring Functions
BI 1
BI 2
H
L
H
H
L
L
L
H
171
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