Siemens 3AH Installation Operation & Maintenance
Vacuum circuit breaker operator module
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- Instructions, installation, operation, maintenance (33 pages) ,
- Instructions manual (38 pages)
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Summary of Contents for Siemens 3AH
- Page 1 Vacuum Circuit Breaker Instructions Installation Operator Module Operation Maintenance Type 3AH SGIM-9918 4.16kV to 38kV Medium-Voltage Equipment...
- Page 2 The sales contract contains the entire obligation of Siemens Energy, Inc. The warranty contained in the contract between the parties is the sole warranty of Siemens Energy, Inc. Any statements contained herein do not create new warranties or modify...
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Page 3: Table Of Contents
Vacuum Circuit Breaker Operator Module Table of Contents Table of Contents ..............1 Maintenance ................. Introduction and Maintenance Intervals ........19 Table of Illustrations ..............2 Recommended Hand Tools ............19 Introduction and Safety ............3 Recommended Maintenance and Lubrication ......19 Introduction ................3 Checks of the Primary Power Path ...........20 Qualified Person ................3 Cleanliness Check ..............20 Signal Words ................3... -
Page 4: Table Of Illustrations
Table A-1b 3AH Circuit Breaker Ratings (New “Constant kA” Rating Basis) ......36 Figure 12 Latch Details ............18 Table A-2 3AH Circuit Breaker Ratings ........37 Figure 13 Undervoltage Locked/Unlocked Selection ....18 Table A-3 Interrupting Capacity of Circuit Breaker Figure 14 Capacitor Trip Device .......... -
Page 5: Introduction And Safety
Introduction and Safety Introduction Signal Words The 3AH family of vacuum circuit breakers is designed to The signal words “Danger” , “Warning” and “Caution” used meet all the applicable ANSI, NEMA and IEEE standards. in this manual indicate the degree of hazard that may be Successful application and operation of this equipment de- encountered by the user. -
Page 6: Receiving, Handling And Storage
3. Notify the Siemens Sales office immediately of any ship- Outdoor Storage - Outdoor storage is not recommended. ment damage. When no other option is available, the circuit breaker must be completely covered and protected from rain, snow, dirt 4. -
Page 7: Installation Checks And Initial Functional Tests
Installation Checks and Initial Functional Tests Introduction This section provides a description of the inspections, checks and tests to be performed on the circuit breaker module only. Inspections, Checks and Tests without Control Power Vacuum circuit breakers are normally shipped with their primary contacts open and their springs discharged. -
Page 8: Vacuum Interrupter/Operator Description
Vacuum Interrupter/Operator Description Introduction The Type 3AH vacuum circuit breaker operator is intended connect the circuit breaker to both primary and control for application in a drawout truck for use in medium voltage power and an operator housing. In a typical installation in metal-clad switchgear. -
Page 9: Vacuum Interrupters
Vacuum Interrupter/Operator Description Figure 4. Vacuum Interrupter/Operating Mechanism Module lower primary disconnect pad provisions, to perform the connection to the switchgear. Bolting hardware is M12 x 1.75 grade 8. Torque M12 bolts to 52 ft/lbs (70 Nm). Figure 3. Cutaway View of Vacuum Interrupter Phase Barriers Plates of glass polyester insulating material are attached to Vacuum Interrupters... -
Page 10: Construction (Figures 1, 2, 5, 6A,And 6B)
Vacuum Interrupter/Operator Description Current-Path Assembly (Figure 5) Construction (Figures 1, 2, 5, 6a and 6b) The current-path assembly consists of the pole head, the Each of the circuit breaker poles are fixed to the rear of the stationary contact, and the moving contact, which is con- operating mechanism housing by two cast-resin insulators. -
Page 11: Figure 6A Stored Energy Operating Mechanism
Vacuum Interrupter/Operator Description 62.5 50.3 62.6 62.5.2 50.5 62.5.1 50.3.1 62.3 50.2 55.2 62.1 62.2 55.1 53.1 50.4.1 54.1 62.8.1 68.1 63.7 62.8 62.8.3 63.1 50.4 61.8 63.5 50.2 Charging mechanism gear box Operation counter Jack shaft 50.3 Charging flange Operator housing 63.1 Lever - phase C... -
Page 12: Figure 6B Stored Energy Operating Mechanism
Vacuum Interrupter/Operator Description 64.2 62.8.2 64.3 62.8.1 64.3.1 62.8 Figure 6b. Stored Energy Operating Mechanism (Circuit Breaker Shown in Closed Position) 64.2 Trip latch pawl Open pushbutton 64.3 Lever 62.8 Trip free coupling rod 64.3.1 Pawl roller 62.8.1 Spring return latch 62.8.2 Trip free coupling link (Draw bar) -
Page 13: Construction
Vacuum Interrupter/Operator Description Construction As the closing spring discharges, the charging shaft (62.1) is The essential parts of the operating mechanism are shown turned by crank (62.2). The cam disc (62.3) at the other end in Figures 6a and 6b. The control and sequence of operation of the charging shaft actuates the drive lever (62.6), with the of the mechanism is described in Figure 8. -
Page 14: Figure 7A-B Operating Mechanism Section Diagram
Vacuum Interrupter/Operator Description Insulating coupler 62.3 Cam disc Jack shaft 50.3 Charging flange 62.5 Lever 63.1 Lever-phase C 50.3.1 Driver 62.5.1 Pawl roller 63.5 Lever-phase B Close pushbutton 62.5.2 Close latch pawl 63.7 Lever-phase A 62.6 Drive lever 53.1 “Close coil, 52SRC” Opening spring Open pushbutton 62.8... -
Page 15: Figure 7C-D Operating Mechanism Section Diagram
Vacuum Interrupter/Operator Description 64.2.1 Trip latch pin 62.5.2 Close latch pawl 62.8.6 Interlock lever-push rod 62.8.1 Spring return latch 62.8.7 Interlock lever-actuator 64.2.2 Latching pawl release lever 62.8.2 Trip free draw bar 62.8.8 Trip free actuator 64.3 Lever 62.8.3 Trip free lever 63.5 Lever-phase B 64.3.1 Jack shaft pawl... -
Page 16: Figure 8 Operator Sequential Operation Diagram
Vacuum Interrupter/Operator Description Anti-pumping feature (Divice 52Y) Care must be taken to see that a continuously ap- plied closing command does not cause the circuit breaker to reclose after it has tripped out on a fault otherwise it may sustain damage by the “pumping” effect. -
Page 17: Rapid Auto-Reclosing
Vacuum Interrupter/Operator Description 50.5 50.6 Figure 9a. Use of Manual Spring Charging Crank Figure 9b. Use of Manual Spring Charging Crank Manual Closing (Figure 6a) Rapid Auto-Reclosing Press the close button (53). The close-open indicator (58) Since the closing spring is automatically recharged by the will then display “Closed”... -
Page 18: Figure 10 Typical Elementary Diagram
Vacuum Interrupter/Operator Description Elementary Diagram (Figure 10) A typical elementary diagram is shown in Figure 10 for DC motor, close and trip operation. Figure 10. Typical Elementary Diagram... -
Page 19: Close Coil (52Src)
Vacuum Interrupter/Operator Description Close coil (52SRC) The close coil (3AY1510) is a standard component of the 11 21 25 27 circuit breaker which is used to unlatch the stored energy of the closing spring and thus close the circuit breaker elec- trically. -
Page 20: Capacitor Trip Device
Vacuum Interrupter/Operator Description absorber is to limit overtravel and rebound of the vacuum On the undervoltage release 3AX1103, the latch (25) is held interrupter movable contacts during the conclusion of an by the locking pin (21) as long as the armature (9) is ener- opening operation.