TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 A-85
Monday, November 26, 2001 1:09 pm
Figure A.98 shows how overtravel and rebound operate during a circuit
breaker opening operation.
Figure A.98 Overtravel/Rebound Open
Overtravel,
Rebound – Close
Parameters include:
Overtravel The distance between the maximum temporary
displacement of the Circuit Breaker Main Contact
beyond the final closed position. Negative
tolerance for overtravel must never be greater than
the specified overtravel.
Rebound The distance between the maximum temporary
displacement of the Circuit Breaker Main Contacts,
which is short of the final closed position. Negative
tolerance for rebound must never be greater than
the specified rebound.
Figure A.99 shows how overtravel and rebound operates for a circuit
breaker closing operation.
Figure A.99 Overtravel/Rebound Closed
Starting Closed
Overtravel
Rebound
Final Open
Position
Position
Starting Closed
Final Closed
Overtravel
Rebound
Position
Position
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