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Vacuum Circuit Breaker Operator Module
Table of Illustrations
Figures
and Manual Charging of Closing Spring ............. 5
Vacuum Circuit Breaker Module .......................... 6
Cutaway View of Vacuum Interrupter .................. 7
Mechanism Module ............................................ 7
Pole Assembly ..................................................... 8
Figure 6a Stored Energy Operating Mechanism ...................... 9
Figure 6b Stored Energy Operating Mechanism ..................... 10
Figure 7a-b Operating Mechanism Section Diagram .............. 12
Figure 7c-d Operating Mechanism Section Diagram .............. 13
Operator Sequential Operation Diagram ............ 14
Figure 9a-b Use of Manual Spring Charging Crank ................ 15
Figure 10 Typical Elementary Diagram ..................................... 16
Figure 11 Construction of Secondary Shunt Release .............. 17
Figure 12 Latch Details ............................................................ 18
Figure 13 Undervoltage Locked/Unlocked Selection .............. 18
Figure 14 Capacitor Trip Device ............................................... 18
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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