Application Guide
P12x/EN AP/A96
MiCOM P120/P121/P122/P123
Page 25/80
8. BACK-UP
DIAGRAM
USING « TRANSFERRED SELECTIVE TRIPPING »
In this application, the relay protecting the incomer can trip the circuit breaker of the faulty
feeder via the watchdog contact of the relay protecting the faulty feeder.
Figure 8 illustrates this example:
CB
CT
Feeder 1
tI>>>
CB1
CT
Trip
tI>>
Incomer
>= 1
&
P121
50/51
WD
Feeder n
CB n
CT
Trip
>= 1
&
P121
50/51
WD
P121
50/51
P0027ENa
FIGURE 8: EXAMPLE OF A BACK-UP DIAGRAM USING " TRANSFERRED SELECTIVE TRIP"
Thus, a fault occurring on a feeder can be cleared tripping the circuit breaker of the faulty
feeder, even if the relay protecting this feeder failed to operate. Without this function, the
fault would normally be cleared by the opening of the circuit breaker of the incomer. This
would lead to a total loss of operation on the affected busbar.
The relay protecting the incomer has two time delay output contacts available (among
others):
−
3rd threshold: tI>>> time delay at 60ms (active threshold for the high phase faults)
−
2nd threshold: tI>> time delay selectively greater than for the third threshold, i.e.
360ms.
The output contact associated with the 2nd threshold is wired in serie with the watchdog
contact of the downstream relays, so that it can activate the trip coil of the circuit breakers of
the feeders. Regarding the output contact associated with the 2nd and 3rd threshold, this
contact is directly wired to the trip coil of the incomer circuit breaker.
Case n°1
→
all relays operate normally:
In this case, watchdog contacts of all the relays are open.
Thus, for a phase fault on the busbar, threshold tI>> or tI>>> of the P121 located on the
incomer will clear the fault.
For a phase fault on one of the feeder, the thresholds tI>> and tI>>> of the relay located on
the incomer being selectively set to higher values than the ones set for the phase thresholds
of downstream relays, the fault shall be cleared selectively by the relay of the faulty feeder
(selectivity between the relay of the incomer and relays of the feeders
is ensured thanks to
intervals of selectivity correctly chosen, or thanks to a suitable blocking diagram).
Содержание MiCom P120
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