5.25
Date Code 20170814
Instruction Manual
SEL-700G Relay
Metering and Monitoring
Breaker Monitor
Determination of
Relay-Initiated Trips
and Externally
Initiated Trips
See Section 7: Communications. Note in the BRE n command response that
the accumulated number of trips and accumulated interrupted current are
separated into two groups of data: those generated by relay-initiated trips (Rly
Trips), and those generated by externally initiated trips (Ext Trips). The
categorization of these data is determined by the status of the TRIPn Relay
Word bit when the SEL
OGIC
control equation breaker monitor initiation
setting BKMONn operates.
Refer to Figure 5.19 and accompanying explanation. If BKMONn newly
asserts (logical 0 to logical 1 transition), the relay reads in the current values
(Phases A, B, and C). Now, the relay must determine whether to accumulate
this current and trip count information under relay-initiated trips or externally
initiated trips.
To make this determination, the relay checks the status of the TRIPn Relay
Word bit at the instant BKMONn newly asserts (TRIPn is the logic output of
Figure 4.36 on page 4.65). If TRIPn is asserted (TRIPn = logical 1), the
current and trip count information is accumulated under relay-initiated trips
(Rly Trips). If TRIPn is deasserted (TRIPn = logical 0), the current and trip
count information is accumulated under externally initiated trips (Ext Trips).
Regardless of whether the current and trip count information is accumulated
under relay-initiated trips or externally initiated trips, this same information is
routed to the breaker maintenance curve for continued breaker wear
integration (see Figure 5.19–Figure 5.23).
Relay-initiated trips (Rly Trips) are also referred to as internally initiated trips
(Int Trips) in the course of this manual; the terms are interchangeable.
Factory-Default Setting Example
As discussed previously, the SEL
OGIC
control equation breaker monitor
initiation factory-default setting is:
BKMONn =
TRIP
n
Thus, any new assertion of BKMONn is deemed a relay trip, and the current and
trip count information is accumulated under relay-initiated trips (Rly Trips).
Additional Example
Refer to Figure 5.24. Output contact
OUTxxx
is set to provide tripping:
OUTxxxn =
TRIP
n
Note that optoisolated input
INxxx
monitors the trip bus. If the trip bus is
energized by output contact
OUTxxx
, an external control switch, or some other
external trip, then
INxxx
is asserted.
Содержание SEL-700G Series
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