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Switchgear and Motor Control Centers - ACADs (08-006)

This session covers switchgear and motor control centers, including grounding, circuit breakers, and supporting materials. Topics include assembly, tagging points, contacts, racking mechanism, arc formation, schematics, and safety equipment.

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Switchgear and Motor Control Centers - ACADs (08-006)

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  1. Switchgear and Motor Control Centers ACADs (08-006) Covered Keywords Switchgear, motor control, ground, circuit breaker. Description Supporting Material

  2. SESSIONS 27 and 284160V Switchgear 480V Switchgear480V Motor Control Centers

  3. Rule of Thumb • 0 - 49 HP 480V MCC • 50 - 249 HP 480V Bus • +250 HP 4160V Bus

  4. Hand out and review drawings: • SD-2500-01 • SD-2548-04

  5. Typical 4160v Switchgear Assembly

  6. Typical 4160v Circuit Breaker Cubicle(Front) Relays Relays Fuse Block Indicator Lights Indicator Lights 4160v Circuit Breaker

  7. Typical 4160v Circuit Breaker Cubicle(Front) Fuse Block Typical Tagging Points 52s Switch 52h Switch

  8. Typical 4160v Circuit Breaker Cubicle(Breaker Removed) Shutterguard Clamp/Lock Bus Ports & Connections Primary Contacts (Stabs) Secondary Contacts (Auxiliary) Shutterguard (Open) Shutterguard (Closed) Actuator arm for auxiliary relays above Grounding Strap

  9. Typical 4160v Circuit Breaker Cubicle(Back) Current Transformer Current Transformer(s) Maple Plug Bus Bar(s)

  10. Typical 4160v Circuit Breaker Racking Mechanism 4160v Circuit Breaker 4160v Circuit Breaker Racking Crank (Bar) Racking Crank (Bar) Unlock Lever Sliding Panel Switchgear Compartment Door

  11. Typical 4160v Circuit Breaker(Front) 5th Wheel Fitting Closing Springs Charging Motor Switch Charging Lever Position Indicator Ground Counter Racking Mechanism Manual Trip Pushbutton Manual Close Lever

  12. Typical 4160v Circuit Breaker(Back) Puffer(s) Arc Chutes Ground Primary Contacts (Stabs) Secondary Contacts (Auxiliary)

  13. Normal Contact Wear Typical 4160v Circuit Breaker Movable & Stationary Contacts Puffer Movable Arcing Contact Stationary Arcing Contact Movable Main Contact Stationary Main Contact

  14. Typical 4160v Circuit BreakerArc Formation

  15. Typical 4160v Circuit BreakerSchematics Auto Trip Schematic Spring Charging Motor Schematic

  16. Typical 480v Circuit BreakerSwitchgear Assembly

  17. Typical 480v Circuit BreakerComponent Relationships

  18. Typical 480v Circuit BreakerRacking Mechanism Position Indicator Shutter Door Racking Crank (Bar) Power Shield Indicator Lights Indicator Lights 480v Circuit Breaker

  19. Breaker Position Label Typical 480v Circuit BreakerPositions

  20. Typical 480v Circuit BreakerSwitchgear Cubicle Grounding Strap Grounding Strap Tagged Stabs Current Transformer Primary Contacts (Stabs) Secondary Contacts (Auxiliary) Unprotected Stabs

  21. Typical 480v Circuit BreakerRear of Cabinet Fuse Block Terminal Strip Typical Tagging Point

  22. Typical 480v Circuit Breaker(Front) Power Shield Arc Chutes Auxiliary Switches Open/Close Indicator Racking Shutter (Door) Closing Spring Charge Indicator Manual Electrical Close Pushbutton Manual Trip Pushbutton Manual Close Lever Auto Trip Indicator/Reset Tagging & Lock Hasp Charging Motor Switch

  23. Typical 480v Circuit Breaker(Back) Primary Contacts (Stabs) Ground Secondary Contacts (Auxiliary) Charging Spring Motor Primary & Secondary CT’s for Powershield

  24. Typical 480v Circuit BreakerSwitchgear Assembly Stationary Arcing Contact Stationary Main Contact Movable Arcing Contact Movable Main Contact

  25. Typical 480v Circuit BreakerMetal & Insulated Arc Chutes

  26. Typical 480v Circuit BreakerTrip Schematic

  27. Typical 480v Circuit BreakerSchematic

  28. Typical 4160v Ground Truck

  29. Typical 4160v Ground Truck Door Door Connections for grounding cables Connections for grounding cables Grounding cables

  30. Typical 4160v Ground Truck Chassis Racking Mechanism Racking Mechanism Primary Contacts 5th Wheel Fitting Ground Racking Mechanism

  31. Typical 4160v Pot Fuses Trip String Relays Agastat Time Delay Relay Terminal Strip Undervoltage Knife Switches Rotary Switch Drawers

  32. Typical 4160v Pot Fuses Connection broken when door is opened Pot Fuse Clips Ground Power Control Secondary

  33. Typical Motor Control Center

  34. Slide Switch Typical AC Motor Control Center Thermal Overload Reset Rotary Switch Auxiliary Contact Thermal Overload Reset Fuses Transducer Term Board Relay Auxiliary Contact Fuses Thermal Overload Reset

  35. Typical DC Motor Control Center Term Board Auxiliary Contact

  36. Typical Motor Control Center Term Board Rotary Switch Auxiliary Contact Relay Rotary Switch Connections (fingers)

  37. Typical Motor Control Center Auxiliary Contact Term Board Slide Switch Slide Switch Connections (fingers) Slide Switch Connections (fingers)

  38. ‘Rocket’ Voltage check Safety Equipment

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