Setting Notes - Siemens SIPROTEC 7SK80 Manual
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As the trip circuit supervision does not operate during system faults, the closed trip contact does not lead to a
fault message. If, however, tripping contacts from other devices operate in parallel with the trip circuit, then the
fault message must be delayed (see also Figure 2-55). The delay time can be set via parameter 8202 Alarm
Delay. A message is only released after expiry of this time. After clearance of the fault in the trip circuit, the
fault message is automatically reset.
Figure 2-55
The following figure shows the logic diagram for the message that can be generated by the trip circuit monitor,
depending on the control settings and binary inputs.
Figure 2-56
Message logic for trip circuit supervision
2.10.2.2 Setting Notes
General
The function is only effective and accessible if address 182 (Section 2.1.1.2) was set to either 2 Binary
Inputs or 1 Binary Input during configuration, the appropriate number of binary inputs has been config-
ured accordingly for this purpose and the function FCT 74TC is ON at address 8201. If the allocation of the
required binary inputs does not match the selected supervision type, a message to this effect is generated
(„74TC ProgFail"). If the trip circuit monitor is not to be used at all, then Disabled is set at address 182.
In order to ensure that the longest possible duration of a trip command can be reliably bridged, and an indica-
tion is generated in case of an actual fault in the trip circuit, the indication regarding a trip circuit interruption is
delayed. The time delay is set under address 8202 Alarm Delay.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Logic diagram of trip circuit supervision with one binary input
Functions
2.10 Monitoring Functions
173
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