doble TDR9000, User Manual, Page: 271 / 454

TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 A-71
Monday
, November 26, 2001 1:09 pm
Main Contact
Timing – Open Parameters include:
Minimum The minimum time for the Main Contacts to part.
Maximum The maximum time for the Main Contacts to part.
Figure A.83 shows how contact timing occurs on a module-by-module
level.
Module (A) The maximum allowable difference in time
between the opening of the two Main Contacts in
any module.
Phase (B) The maximum allowable difference in time
between the opening of any two Main Contacts in
a phase.
Breaker (C) The maximum allowable difference in time
between the opening of any two Main Contacts in
a circuit breaker.
Figure A.83 Main Contact Timing – Open 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
A
B
C
A
B
C
0 20 40 60 80 100
Time (ms)
First Switch to Last Switch