Functions
2.48 Protection Function Control
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
328
2.48.2 Tripping Logic for the Entire Device
This section comprises a description regarding the general trip and termination of the trip command.
2.48.2.1 Functional Description
General Trip
The tripping signals for all protective functions are connected by ”OR” and generate a message „Relay
TRIP“.
This annunciation, like individual trip indications, can be allocated to an LED or an output relay. It can also be
used as a sum event.
Control of the Trip Command
For controlling the trip command the following applies:
• If a protective function is set to Block. Relay, it is blocked for the activation of the output relay. The other
protective functions are not affected by this.
• A trip command once transmitted is stored (see Figure 2-146). At the same time, the minimum trip command
duration T TRIPCOM MIN is started. This trip signal duration timer ensures the trip signal is transmitted to
the circuit breaker for a sufficient amount of time, even if the function which issued the trip signal drops out
quickly. The trip signal is only terminated after all protection Functions drop out AND the minimum trip signal
duration expires.
• Finally, it is possible to latch the trip signal until it is manually reset (lockout function). This allows interlocking
the circuit breaker against reclosing until the cause of the malfunction has been clarified and the interlock
has been manually reset. The reset takes place either by pressing the LED reset key or by activating an
appropriately masked binary input („>Reset LED“). A precondition, of course, is that the circuit breaker
trip coil – as usual – remains blocked as long as the trip signal is present, and the trip coil current is inter-
rupted by the auxiliary contact of the circuit breaker.
Figure 2-146 Terminating the trip signal, example of a protection function
2.48.2.2 Setting Notes
Command Duration
The minimum trip command duration 280 TMin TRIP CMD has already been described in Section 2.5. It is
valid for all protection functions which can issue a trip command.
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