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MODEL CT-7500
1. Contact time is shown in both millisecond and cycles. From figure 9-2, contact channel #1 time
is 181.50 ms or 10.89 cycles.
2. Contact bounce duration is 1.70 ms
3. Contact wipe is measured as .77 inch.
4. The slowest contact and fastest contact differential time is shown as contact delta:0.10 ms.
5. AC current sensor time is shown as CT Channel Analysis time in millisecond cycles. The CT
time is shown as 184.70ms or 11.08 cycles.
Since this print out was generated to show both Quick-Shot mode and Time-Travel mode; both
CT time and contact-travel readings are shown on this report.
6. Breaker contact stroke is 7.08 inches.
7. Contact velocity calculation is 5.72 feet per second.
8. Contact over-travel distance is 0.29 inch.
9. Contact bounce-back distance is 0.16 inch.
10. Contact velocity calculation is from the 2 analysis points:
Analysis point # 1 is 1.00 inch from fully closed position.
Analysis point # 2 is 5.00 inches from fully closed position.
11. The DC power supply was monitored during test. The nominal voltage is 52V and the
minimum is 37 V.
12. Initiate current is 5.1 amperes.
13. Timing shot duration is 1 second.
14. There is no insertion resistor in this test (no insertion resistor time is measured).
15. Trigger mode is internal (timing window starts at the same time the CT-7500 energized the
circuit breaker).
OPERATING INSTRUCTIONS
Note
29
Rev 2 Jan 2001
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