Vacuum Circuit Breaker Operator Module
Table of Illustrations
Figures
Pole Assembly ..................................................... 8
Figure 15 Operator Lubrication Points ..................................... 21
Figure 16 Contact Erosion Check Mark ................................... 22
Figure 17 Typical Vacuum Interrupter Contact Life Curves .......24
Figure 18 Circuit Breaker Pole Assembly/Vacuum Check
Mechanical/Contact Resistance Test ................ 26
Figure 19 Vacuum Interrupter Replacement Illustration ......... 29
Figure 20 Technique for Tightening Vacuum Interrupter
Terminal Clamp Hardware................................. 30
Tables
Table 1
Maintenance Tasks ............................................ 20
Table 2
Maintenance and Lubrication Intervals
(ANSI C37.06) .................................................... 20
Table 3
Typical Vacuum Interrupter Contact
Life Expectancy ................................................. 23
Table 4
High Potential Test Voltages .............................. 25
Table 5
Maximum Contact Resistance .......................... 27
Table 6
Overhaul Schedule ............................................ 28
Table 7
Vacuum Interrupter Stroke ............................... 32
Table 8
Troubleshooting .............................................. 33-34
Appendix
Table A-1a 3AH Circuit Breaker Ratings
(Historic "Constant MVA" Rating Basis) ..................... 35
Table A-1b 3AH Circuit Breaker Ratings
(New "Constant kA" Rating Basis) .............................. 36
Table A-2 3AH Circuit Breaker Ratings ................................... 37
Table A-3 Interrupting Capacity of Circuit Breaker
Auxiliary Switch Contacts ........................................... 37
Table A-4 Circuit Breaker Weights .......................................... 37
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