Safety POWELL PowlVac-ND 4 Series, Instruction Bulletin

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®
iv
01.4IB.77020
PowlVac-ND
®
and PowlVac-NDA
™
Series 4
Vacuum Circuit Breakers
Figures
Figure 1 Typical PowlVac-ND
®
Series 4 Vacuum Circuit Breaker .................................8
Figure 2 Typical PowlVac-NDA ™ Series 4 Vacuum Circuit Breaker .............................8
Figure 3 PowlVac-NDA ™ Circuit Breaker - Exterior View .............................................9
Figure 4 PowlVac-NDA ™ Circuit Breaker - Interior View ............................................10
Figure 5 Cam and Fundamental Linkage Positions ...................................................11
Figure 6 Mechanism and Trip Linkages .....................................................................12
Figure 7 Operation Sequence ....................................................................................14
Figure 8 Typical Control Scheme ................................................................................15
Figure 9 Closed Door Racking Mechanism and Interlock .........................................19
Figure 10 Circuit Breaker in Shipping Carton ..............................................................24
Figure 11 Circuit Breaker on Crane ..............................................................................25
Figure 12 Secondary Disconnect Device ......................................................................34
Figure 13 Racking Handle Insertion ............................................................................34
Figure 14 Circuit Breaker Anti-Rollout Latch ...............................................................36
Figure 15 Lubrication ...................................................................................................47
Figure 16 Lubrication (cont) .........................................................................................48
Figure 17 Main Closing Spring Assembly Installed .....................................................49
Figure 18 Main Closing Spring Assembly Compressed for Removal ...........................49
Figure 19 Primary & Secondary Trip Prop Adjustment ...............................................51
Figure 20 Feeler Gauge ................................................................................................52
Figure 21 Latch Check Switch Adjustment ...................................................................53
Figure 22 Measurement of Open Position ...................................................................55
Figure 23 Measurement of Closed Position .................................................................55
Figure 24 Primary Current Path ...................................................................................60
Figure 25 Control Devices ............................................................................................62
Tables
Table A Field Dielectric Test Values .................................................................................26
Table B Lubrication .........................................................................................................46
Table C Timing .................................................................................................................57
Table D Primary Resistance .............................................................................................57
Table E Primary Current Path ..........................................................................................60
Table F Control Devices ...................................................................................................61
Table G Miscellaneous Parts ...........................................................................................63