P.9.13
Date Code 20151029 Protection Manual SEL-411L Relay
Monitoring and Metering
Circuit Breaker Monitor
EXAMPLE 9.7 Pole Scatter Settings
Use Circuit Breaker 1, a single-pole tripping circuit breaker, for this
example. 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
ACSELERATOR
QuickSet
Breaker Monitor (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,
respectively. This example uses control inputs IN201–IN206; you can
use any control 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 discrepancy 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)
If any of the pole-open times (TAB, TBC, and TCA in Figure 9.7) exceed
4 ms, or if any of the pole close times exceed 6 ms, the relay asserts
the Relay Word bit B1PSAL. Assertion of B1PSAL indicates any one of
the following four conditions:
➤ The pole scatter time for trip operation exceeds the alarm
setting time (4 ms)
➤ The pole scatter time for close operation exceeds the alarm
setting time (6 ms)
➤ One phase auxiliary circuit breaker (52A) contact status
change exceeds B1PSTRT plus approximately 5 ms after the
trip initiation
➤ One phase auxiliary circuit breaker (52A) contact status
change exceeds B1PSCLT plus approximately 5 ms after the
close initiation
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