8.14
SEL-400 Series Relays Instruction Manual Date Code 20171006
Monitoring
Circuit Breaker Monitor
Example 8.7 Pole Scatter Settings
Use Circuit Breaker 1, a single-pole tripping circuit breaker, for this exam-
ple. This example uses control inputs IN301, IN302, and IN303 for the A-,
B-, and C-Phases, respectively; you can use any control inputs that are
appropriate for your installation.
The control voltage for this example is 125 Vdc. Control Inputs IN301–
IN303 are located on I/O Board #3. Connect the circuit breaker normally
open auxiliary circuit breaker (52A) contacts through station battery power
to IN301, IN302, and IN303.
Set the relay to respond to these inputs by using the QuickSet Breaker Mon-
itor (SET M) settings:
52AA1 := IN301 A-Phase Normally Open Control Input—BK1
(SEL
OGIC Equation)
52AB1 := IN302 B-Phase Normally Open Control Input—BK1
(SEL
OGIC Equation)
52AC1 := IN303 C-Phase Normally Open Control Input—BK1
(SEL
OGIC Equation)
Connect external trip signals to IN201, IN202, and IN203, and external close
signals to IN204, IN205, and IN206 for the A-, B-, and C-Phases, respec-
tively. This example uses control inputs IN201–IN206; you can use any con-
trol inputs that are appropriate for your installation.
Set the pole scatter trip alarm time threshold (B1PSTRT) at 4 ms, the pole
scatter close alarm time threshold (B1PSCLT) at 6 ms, and the pole discrep-
ancy time delay (B1PDD) at 1400 ms. Use your company standard practices
to determine these settings for your application. For this example, enter the
following settings:
B1PSTRT := 4 Pole Scatter Trip Alarm Threshold—BK1 (1–999 ms)
B1PSCLT := 6 Pole Scatter Close Alarm Threshold—BK1 (1–999 ms)
B1PDD := 1400 Pole Discrepancy Time Delay—BK1 (1–9999 ms)
EB1MON := Y Breaker 1 Monitoring (Y, N)
BK1TYP := 1 Breaker 1 Trip Type (Single Pole = 1, Three Pole = 3)
BM1TRPA := TPA1 OR IN201 Breaker Monitor A-Phase Trip—BK1
(SEL
OGIC Equation)
BM1TRPB := TPB1 OR IN202 Breaker Monitor B-Phase Trip—BK1
(SEL
OGIC Equation)
BM1TRPC := TPC1 OR IN203 Breaker Monitor C-Phase Trip—BK1
(SEL
OGIC Equation)
BM1CLSA := BK1CL OR IN204 Breaker Monitor A-Phase Close—
BK1 (SEL
OGIC Equation)
BM1CLSB := BK1CL OR IN205 Breaker Monitor B-Phase Close—
BK1 (SEL
OGIC Equation)
BM1CLSC := BK1CL OR IN206 Breaker Monitor C-Phase Close—
BK1 (SEL
OGIC Equation)
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