TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 A-121
Monday, November 26, 2001 1:09 pm
Dwell Time
The callouts (B and C) in Figure A.144 on page A-122 show the
parameters and specifications that effect Dwell times for a breaker.
B This is the time when all Main Contacts within a
phase are closed during trip-free operation
(Figure A.142).
Figure A.142 Trip-Free Test Operation for a Phase (Live Tank Breaker)
Within the phase, the Dwell time (Figure A.144 on page A-122) is
measured as the difference between the time required for the first
Main Contact to open and the last Main Contact to close.
C This is the time when all Main Contacts within the
circuit breaker are closed during trip-free operation
(Figure A.143).
Figure A.143 Trip-Free Test Operation Within a Breaker
(Live Tank Breaker)
Contact #1
Contact #2
Last to close
First to open
Dwell
Time
0
A
Contact #1
Contact #2
Last to close
First to open
Dwell
Time
0
A
0
B
0
C
#1
#2
#3
#4
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