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Test Plan Items
A-72 72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Main Contact
Timing – Close Parameters include:
Minimum The minimum time for the Main Contacts to make.
Maximum The maximum time for the Main Contacts to make.
Figure A.84 shows how contact timing occurs on a module-by-module
level.
Module (A) The maximum allowable difference in time
between the closing of the two Main Contacts in
any module.
Phase (B) The maximum allowable difference in time
between the closing of any two Main Contacts in a
phase.
Breaker (C) The maximum allowable difference in time
between the closing of any two Main Contacts in a
circuit breaker.
Figure A.84 Main Contact Timing – Close Breaker
Module #1
Module #1
Module #2
Module #1
Module #2
Module #2
#!
#2
#3
#4
#!
#2
#3
#4
Contact #1
Contact #2
Contact #3
Contact #4
Main Contact
opening time
C
0
A
0
B
0
C
0 20 40 60 80 100
Time (ms)
First Switch to Last Switch
B
A