Transcript Typical 4160v Switchgear Assembly

ACADs (08-006) Covered
1.3.7.2
1.3.7.4
2.1.14.1 5.1.1.1.1.1
5.1.1.2.1.7
5.1.1.2.1.12e 5.1.2.20
Keywords
Switchgear, motor control, ground, circuit breaker.
Description
Supporting Material
5.1.1.2.1.3
SESSIONS 27 and 28
4160V Switchgear
480V Switchgear
480V Motor Control Centers
Rule of Thumb
• 0 - 49 HP480V MCC
• 50 - 249 HP 480V Bus
• +250 HP 4160V Bus
• Hand out and review drawings:
• SD-2500-01
• SD-2548-04
Typical 4160v Switchgear Assembly
Relays
Fuse Block
Indicator
Lights
4160v
Circuit
Breaker
Typical 4160v Circuit Breaker Cubicle
(Front)
Fuse Block
Typical
Tagging
Points
52s Switch
52h Switch
Typical 4160v Circuit Breaker Cubicle
(Front)
Shutterguard
Clamp/Lock
Bus Ports &
Connections
Primary Contacts
(Stabs)
Shutterguard
(Open)
Secondary Contacts
(Auxiliary)
Shutterguard
(Closed)
Actuator arm for
auxiliary relays above
Grounding Strap
Typical 4160v Circuit Breaker Cubicle
(Breaker Removed)
Current Transformer
Current Transformer(s)
Maple Plug
Bus Bar(s)
Typical 4160v Circuit Breaker Cubicle
(Back)
Racking Crank
(Bar)
Unlock
Lever
Sliding
Panel
Switchgear
Compartment
Door
Typical 4160v Circuit Breaker
Racking Mechanism
4160v
Circuit
Breaker
5th Wheel
Fitting
Closing
Springs
Charging
Motor
Switch
Charging
Lever
Position
Indicator
Ground
Counter
Manual
Close
Lever
Manual
Trip
Pushbutton
Typical 4160v Circuit Breaker
(Front)
Racking
Mechanism
Puffer(s)
Arc Chutes
Ground
Primary Contacts
(Stabs)
Secondary Contacts
(Auxiliary)
Typical 4160v Circuit Breaker
(Back)
Normal
Contact
Wear
Puffer
Movable
Arcing
Contact
Stationary
Arcing
Contact
Movable
Main
Contact
Stationary
Main
Contact
Typical 4160v Circuit Breaker
Movable & Stationary Contacts
Typical 4160v Circuit Breaker
Arc Formation
Auto Trip Schematic
Spring
Charging
Motor
Schematic
Typical 4160v Circuit Breaker
Schematics
Typical 480v Circuit Breaker
Switchgear Assembly
Typical 480v Circuit Breaker
Component Relationships
Position
Indicator
Shutter
Door
Racking Crank
(Bar)
Power
Shield
Indicator
Lights
480v
Circuit
Breaker
Typical 480v Circuit Breaker
Racking Mechanism
Breaker Position Label
Typical 480v Circuit Breaker
Positions
Grounding Strap
Tagged
Stabs
Current
Transformer
Primary Contacts
(Stabs)
Unprotected
Stabs
Secondary Contacts
(Auxiliary)
Typical 480v Circuit Breaker
Switchgear Cubicle
Fuse Block
Terminal Strip
Typical Tagging
Point
Typical 480v Circuit Breaker
Rear of Cabinet
Power Shield
Arc Chutes
Auxiliary
Switches
Racking
Shutter
(Door)
Open/Close
Indicator
Closing
Spring
Charge
Indicator
Manual Electrical
Close Pushbutton
Manual Trip
Pushbutton
Manual Close Lever
Auto Trip
Indicator/Reset
Tagging &
Lock Hasp
Charging Motor
Switch
Typical 480v Circuit Breaker
(Front)
Primary Contacts
(Stabs)
Ground
Secondary Contacts
(Auxiliary)
Charging Spring Motor
Primary & Secondary
CT’s for Powershield
Typical 480v Circuit Breaker
(Back)
Stationary
Arcing
Contact
Stationary
Main
Contact
Movable
Arcing
Contact
Movable
Main
Contact
Typical 480v Circuit Breaker
Switchgear Assembly
Typical 480v Circuit Breaker
Metal & Insulated Arc Chutes
Typical 480v Circuit Breaker
Trip Schematic
Typical 480v Circuit Breaker
Schematic
Typical 4160v Ground Truck
Door
Connections
for
grounding
cables
Grounding
cables
Typical 4160v Ground Truck
Racking
Mechanism
Primary Contacts
5th Wheel
Fitting
Ground
Racking
Mechanism
Typical 4160v Ground Truck Chassis
Trip
String
Relays
Terminal
Strip
Undervoltage
Knife
Switches
Rotary Switch
Drawers
Typical 4160v Pot Fuses
Agastat
Time
Delay
Relay
Connection
broken when
door is opened
Pot Fuse Clips
Ground
Power Control
Secondary
Typical 4160v Pot Fuses
Typical Motor Control Center
Slide Switch
Rotary Switch
Thermal
Overload
Reset
Auxiliary
Contact
Thermal
Overload
Reset
Fuses
Transducer
Term Board
Relay
Auxiliary
Contact
Fuses
Thermal
Overload
Reset
Typical AC Motor Control Center
Term Board
Auxiliary
Contact
Typical DC Motor Control Center
Term Board
Rotary
Switch
Auxiliary
Contact
Relay
Rotary Switch
Connections
(fingers)
Typical Motor Control Center
Auxiliary
Contact
Term Board
Slide
Switch
Slide Switch
Connections
(fingers)
Typical Motor Control Center
‘Rocket’
Voltage
check
Safety Equipment