1 Current Date Standards Document Path..ppt SWITCHGEAR BIG GRAY BOXES SWITCHBOARD.
Transcript of 1 Current Date Standards Document Path..ppt SWITCHGEAR BIG GRAY BOXES SWITCHBOARD.
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SWITCHGEAR BIG GRAY BOXES SWITCHBOARD
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Why Different Standards? ANSI vs UL
Feature Switchboard Switchgear Environment Environment
History HistorySegment Residential/Commercial Utility/IndustrialConcerns Safety/Fire Protection Safety/Fire/ Protection
Personnel/Property Protection
Process Protection and Continuation
Certification Many small suppliers-Third Party (UL) required to assure requirements
Few, Large suppliers User-Specifier Standards (Self Certified) Industry Groups (ANSI/IEEE)
(Third Party Certification since 1982)
Design Verification
"Paper Design" or Test Verification
Test Verification Required
Maintenance Minimum or None Permitted (Often Necessary!)
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Standards Comparison
Feature Switchboard Switchgear
Structure UL 891 ANSI C37.20.1(UL 1558)
Devices UL 489(MCCB)
ANSI C37.13(LVPB)(UL 1066)
UL 977(BOLT-LOC)
UL 98(Fused Switch)
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Standards Comparison (cont.)
Feature Switchboard Switchgear
Qualification Analysis or Test Must Test
Device Mtg. Fixed or DO DO Only
Bus Sizing Design or Test Heat RiseTest
InternalBarriers
Optional-Mfg.Determines
BreakerCompt.-Defined(Others-Optional
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Comparison (cont.)
Feature Switchboard Switchgear
Short TimeWithstandRating
Not Defined(Mfgr.Establishestest)
PreciselyDefined
ANSI Test:.5 sec closed15 sec open.5 sec closedNo trip unit(aux trip)
Switchgear has Defined Short Time Withstand Ratings!
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“Practice” Comparison
Feature Switchboard SwitchgearMaintenance(Industry
Practice)
VariousPractices; non-maintainablebreakers and tripunits acceptable
Permitted to maintainequipment operatingparameters
Breaker can be rebuilt;contacts and trip unitsfield replaceable
Switchgear maintenance permitted (not required by standard).
Switchboard maintenance often not allowed.
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Side View
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Rear View
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Insulated Case vs Molded Case
Insulated Case
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Old Vs New
Insulated Case UL 1066 IRON FRAME ANSI
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Insulated Case vs Molded Case
Molded Case
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Advantages of Insulated Case Vs Iron Frame
Smaller footprintMore reliable (Modular Design with Fewer Parts)Higher interrupting ratings Higher withstand ratings (30 Cycles)Reduced maintenanceElectronic Trip Units
Field Installable Trip UnitsCommunicationsPower monitoring (2.5% Accuracy)
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Mechanical Construction
• Breaker Frames– Small :
• 800A ANSI, • 1200A UL, • 1600A IEC
– Medium : – 800 to 3200A ANSI, – 800 to 3000A UL, – 800 to 4000A IEC
– Large : – 4000 to 5000A ANSI, – 4000 to 6000A UL,– 4000 to 6300A IEC
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Organic Vs Iron Frame
• Very strong and lightweight• Provides good insulation, isolation,
and dielectric• Molded to support and hold internal
parts with no adjustments• Fewer parts reduces complexity of
assembly and maintenance
The thermoset material of the organic case has several advantages:
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Organic Vs Iron Frame
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A
LCD ammeter LED Bargraph
P
LCD All functions
Display type
H
LCD All functions
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UL 891 Switchboards
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Switchboards
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Switchboards
• Typical Switchboard Ratings
•5000 A Mains and Bus•1200 A and smaller group mounted•Greater than 1200A Individally mounted Fixed or Drawout•Front Connected•UL 891 Gear•UL 489 Breakers
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“Hybred UL 891 Switchboards”
• Mix Insulated Case and Molded Case• Individially mounted
– Front Connected– Rear Connected
• Individually mounted – Drawout– Fixed
• Group Mounted and Drawout• Fusible and Circuit Breaker• No requirement for isolation or
– Barriers
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SWITCHGEAR BIG GRAY BOXES SWITCHBOARD