Schweitzer Engineering SEL-351P, Quick Start Manual

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8-12 Breaker/Recloser Monitor, Battery System Monitor, Date Code 990430
Metering, and Load Profile Functions
SEL-351P Manual Técnico
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Accumulated number of externally initiated trips
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Accumulated interrupted current from externally initiated trips
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Percent contact wear for each phase
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Accumulated number of trips involving A-phase
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Accumulated number of trips involving B-phase
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Accumulated number of trips involving C-phase
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Accumulated number of trips involving ground (EF/G)
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Accumulated number of trips involving SEF element
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Date when the preceding items were last reset via the BRE R command
A-phase, B-phase, or C-phase involvement is determined by checking if respective elements
50A4, 50B4, or 50C4 are picked up when setting BKMON asserts for a trip (see end of Table 1.2
for information on elements 50A4, 50B4, and 50C4).
Ground involvement is determined by checking if elements 50G6, 50N6, 51N1, or 51N2 are
picked up when setting BKMON asserts for a trip (see correspondence to EF/G LED in
Figure 1.50).
SEF involvement is determined by checking if SEF element 67N3T is picked up when setting
BKMON asserts for a trip (see correspondence to SEF LED in Figure 1.50).
See BRE n Command (Preload/Reset Breaker Wear) in Section 10: Serial Port
Communications and Commands . The BRE W A command allows the percent breaker wear
and trip operation counters to be preloaded for each individual phase/value.
The BRE R command resets the accumulated values and the percent wear for all three phases.
For example, if contact wear has reached the 100% wear level for A-phase, the corresponding
Relay Word bit BCWA asserts (BCWA = logical 1). Execution of the BRE R command resets
the wear levels for all three phases back to 0% and consequently causes Relay Word bit BCWA
to deassert (BCWA = logical 0).
Via Front Panel
The information and reset functions available via the previously discussed serial port commands
BRE A and BRE R are also available via the front-panel OTHER pushbutton. See the OTHER
pushbutton in the
Pushbutton Primary Functions subsection in the Front-Panel Interface
section of the SEL-351P Quick-Start Installation and User’s Guide .
Determination of Control Initiated Trips and Externally Initiated Trips
See BRE Command (Breaker Monitor Data) in Section 10: Serial Port Communications and
Commands . Note in the BRE command response that the accumulated number of trips and
accumulated interrupted current are separated into two groups of data: that generated by recloser
control initiated trips (Cntrl Trips) and that generated by externally initiated trips (Ext Trips).
The categorization of this data is determined by the status of the TRIP Relay Word bit when the
SEL
OGIC
Control Equation breaker monitor initiation setting BKMON operates.
Refer to Figure SECTION 8: .3 and accompanying explanation. When BKMON asserts
(logical 0 to logical 1 transition), the relay reads in the current values (Phases A, B, and C). Now