Schweitzer Engineering SEL-351P, Quick Start Manual

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8-6 Breaker/Recloser Monitor, Battery System Monitor, Date Code 990430
Metering, and Load Profile Functions
SEL-351P Manual Técnico
First, use the SET FZ (global EZ settings) command in Access Level E (EZ) or Access Level 2 to
make setting Recloser Wear Monitor (AUTO, Y, N) = Y. Then, in Access Level 2, use the SET
G (global settings) command to make the following SEL-351P contact wear monitor settings:
COSP1 = 10000
COSP2 = 150
COSP3 = 12
KASP1 = 1.20
KASP2 = 8.00
KASP3 = 20.00
Figure SECTION 8: .2 shows the resultant breaker maintenance curve.
Breaker Maintenance Curve Details
In Figure SECTION 8: .2, note that set points KASP1, COSP1 and KASP3, COSP3 are set with
breaker maintenance information from the two extremes in Table SECTION 8: .4 and
Figure SECTION 8: .1.
In this example, set point KASP2, COSP2 provides an intermediate breaker maintenance point in
the breaker maintenance information in Table SECTION 8: .4 and Figure SECTION 8: .1. Set
point KASP2, COSP2 should be set to provide the best “curve-fit” with the plotted breaker
maintenance points in Figure SECTION 8: .1.
Each phase (A, B, and C) has its own breaker maintenance curve (like that in Figure SECTION
8: .2), because the separate circuit breaker interrupting contacts for Phases A, B, and C don’t
necessarily interrupt the same magnitude current (depending on fault type and loading).