1
5kV and 15kV Metal-Clad Switchgear
Table of Contents
Introduction and Safety ................................................................ 2
Introduction ...................................................................................... 2
Qualified Person .............................................................................. 2
Signal Words .................................................................................... 2
Dangerous Procedures .................................................................... 2
Field Service Operation .................................................................... 2
General Description .................................................................... 3-4
Introduction ...................................................................................... 3
Scope ............................................................................................... 4
General Description ......................................................................... 4
Receiving, Handling & Storage ................................................. 5-8
Receiving ......................................................................................... 5
Identification .................................................................................... 5
Inspection and Unpacking ................................................................ 5
Shipping Damage Claims ................................................................. 5
Lifting and Moving ........................................................................... 6
Indoor Switchgear ............................................................................ 6
Lifting Indoor Switchgear with Crane .............................................. 6
Moving Switchgear in Obstructed Areas without a Crane .............. 6
Outdoor Switchgear ......................................................................... 7
Final Movement of Assembly .......................................................... 8
Storage: Indoor Switchgear ............................................................ 8
Storage: Shelter-Clad Outdoor Switchgear ..................................... 8
Storage: Non-Walk-In Outdoor Switchgear ..................................... 8
Storage: Type GMI Vacuum Circuit Breakers and Lift Truck .......... 8
Installation ................................................................................ 9-22
Preparation for Installation ............................................................... 9
Foundation-General Requirements .................................................. 9
Indoor Foundations .......................................................................... 9
Outdoor Foundations ....................................................................... 9
Installing Shipping Sections ........................................................... 14
Installing Switchgear with
Throat Connection to Power Transformer ................................ 14
Anchoring, Leveling, and Assembling Indoor Switchgear ............. 15
Anchoring and Leveling Outdoor Shelter-Clad Switchgear ............ 15
Assembly of Single Aisle Shelter-Clad Switchgear ........................ 16
Assembly of Common Aisle Shelter-Clad Switchgear ................... 16
Assembly of Single Aisle Shelter-Clad
Switchgear with Work Space ................................................... 16
Expanding Length of
Existing Shelter-Clad Switchgear by Addition of Units ............. 17
Anchoring, Leveling, and Assembling
Conventional Outdoor (Non-Walk-In) Switchgear ..................... 17
Expanding Length of Existing Conventional Outdoor
(Non-Walk-In) Switchgear by Addition of Units ......................... 18
Electrical Connections ............................................................ 23-31
Bus Bar .......................................................................................... 23
Bus Joints ...................................................................................... 23
Bus Insulation ................................................................................ 26
Bus Joint Insulation - Boots ........................................................... 27
Bus Joint Insulation - Taping .......................................................... 29
Transformer Bus Joints - Insulation ............................................... 29
Primary Cable Connections ............................................................ 29
Secondary Control Wiring .............................................................. 31
Ground Connections ...................................................................... 31
Temporary Ground Connections .................................................... 31
Instrument Transformers ....................................................... 32-36
Control Power and Voltage Transformers-General Information ..... 32
Voltage Transformers .................................................................... 32
Control Power Transformer ........................................................... 33
Operating Sequence ...................................................................... 33
To Disconnect VT Rollout ...................................................... 33
To Connect VT Rollout ......................................................... 33
To Disconnect CPT Rollout or CPT Fuses ............................. 33
To Connect CPT Rollout or CPT Fuses ................................. 33
Current Transformers .................................................................... 36
Circuit Breaker Position ......................................................... 37-43
Cell Preparation ...............................................................................37
Circuit Breaker Racking Mechanism ...............................................37
Interference Blocking Plate .............................................................37
Secondary Disconnect ....................................................................37
Mechanism Operated Cell Switch (MOC) ......................................37
Truck Operated Cell Switch (TOC) ..................................................37
Circuit Breaker Ground Connection ............................................... 38
Shutter Operation .......................................................................... 38
Breaker Installation and Removal .................................................. 38
De-Energizing Control Power to Circuit Breaker ............................ 38
Spring Discharge Check ................................................................. 38
Removal from Cell in Indoor (if not on raised pad)
and Shelter-Clad Outdoor Switchgear ...................................... 39
Removal from Cell in Outdoor Non-Walk-In Enclosures,
or for Indoor Switchgear Installed on a Raised Pad .................. 40
Racking Crank Engagement Procedure ......................................... 41
Breaker Racking ............................................................................. 42
Racking from DISCONNECT to CONNECT Position ...................... 42
Racking from CONNECT to TEST or DISCONNECT Position ........ 42
Contact Penetration ....................................................................... 42
Closed Breaker Racking Interlock .................................................. 43
Racking Access Interlock ............................................................... 43
Trip-Free Interlock .......................................................................... 43
Spring Discharge Interlock ............................................................. 43
Inspection and Testing ................................................................ 44
Inspection and Testing ................................................................... 44
Inspection ...................................................................................... 44
Testing ........................................................................................... 44
Placing Equipment into Service ..................................................... 44
Maintenance ........................................................................... 45-47
Introduction and Maintenance Intervals ........................................ 45
Recommended Hand Tools ........................................................... 45
Recommended Maintenance and Lubrication ............................... 45
Lubrication ..................................................................................... 46
Moving Parts .................................................................................. 46
Electrical Contacts ......................................................................... 46
Cleaning Insulation ......................................................................... 46
Corrosive Atmospheres ................................................................. 47
Relays and Instruments ................................................................. 47
Equipment Surfaces ...................................................................... 47
Accessories ............................................................................. 48-49
Split Plug Jumper Test Device ....................................................... 48
Test Cabinet ................................................................................... 48
Lift Truck ........................................................................................ 48
Lift Sling ......................................................................................... 48
Electric Racking Accessory ............................................................ 48
Type 3EF Surge Limiters ............................................................... 49
Cover 1571-95