Workshop Arc Flash
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Transcript of Workshop Arc Flash
Smart Water for Smart Cities
Arc Flash Mitigation Enhancing Personnel SafetyTerry L. SchiazzaLow Voltage Offer MarketingSeneca (SC) Plant
Sponsored by the Water Wastewater
Competency Center
Columbus, OH
May 2013
2
Enhancing Personnel Safety
Five to ten arc flash explosions occur in electrical equipment every day in the United States
-According to statistics compiled by Cap-Schell, Inc., a Chicago-based research and consulting firm that specializes in preventing workplace injuries and deaths
5-10
Smart Cities are Safe Cities
Arc Flash Video
Picture from Schneider Electric 484EN Guide (Internal arc guide, theory and phenomena)
Arc Flash Characteristics
Arc Flash Mitigation Solutions
Prevention / Avoidance
Passive ContainmentEnergy Redirection
Installation Considerations
Plenums (ductwork)
Size of Equipment
Equipment location
Passive ProtectionVirtual Mains
Zone Selective Interlocking
Bus Differential Relays
Low Arc Flash CB
High Resistance Grounding
Arc Flash Sensing Relay-
VAMP technology
Active ProtectionArc Flash Sensing Relay
with Arc Quenching technology Interactive Protection
Arc Flash
Energy-Reducing Maintenance Switches
System (Equipment) Design
De-energize Equipment
Site Safety Procedures
Intelligent MCCs
AF Mitigating Features
Electric Operated CBs
AF
Arc Flash Video
ANSI C37.20.1 Power-Zone 4 Drawout SwitchgearANSI C37.20.7 Arc Resistant (ANSI C37.20.1 Power-Zone 4 Drawout Switchgear)
North America Low Voltage Arc Resistant Offer
Schneider Electric – SpecTech 2012, November Update 9
● IEEE STD C37.20.7-2007●
IEEE guide for testing metal- enclosed switchgear rated up to 38 kV for internal arcing faults
●
A procedure for testing and evaluating the performance of metal-enclosed switchgear for internal arcing faults is covered. A method of identifying the capabilities of this equipment is given. Service conditions, installation, and application of equipment are also discussed.
Schneider Electric – SpecTech 2012, November Update 10
Low Voltage Switchgear
Magnum DS
(Type 2B)
WL
(Type 2B)
MNS SG
(Type 2B)
Entellisys 4.5
(not tested to C37.20.7)
(utilizes Siemens WL, may also use Eaton Magnum DS)
ArcBlok Patented TechnologyInternal Arc Gas Management System
Prevents and Controls Arcing Cluster Shields
Cradle Barriers
Arc Ventilation
Schneider Electric – SpecTech 2012, November Update 12
Testing Standard
C37.20.7
UL witnessed and Certified
Reinforced Enclosure
60” D minimum
Optimized ventilation system for maximum heat transfer
Baffle compartment assembly
Ratings
5000A Bus and 5000A Breaker
100 kAIR up to 635 Vac
Type 2B
Breaker and Cradle
Masterpact ArcBlokTM
(patented design)
Cell Keying
Optional Features
Insulated Bus
Plenums
Zone Selection Interlocking
High Resistant Grounding
Energy Reduction
Maintenance Switch (AMS)
Breaker Remote Racking
Power-Zone 4 Arc Resistant Highlights
●What is the Standard for Low Voltage Motor Control Centers?
Low Voltage Motor Control CenterA Standard Dilemma….Resolved
●
IEEE PC37.20.7, Draft 4
Apr. 2013, Annex H
●
Purpose of the Annex is to provide specific information
for test sample configuration, testing methods, test assessment, and additional ratings that are specific to MCCs (UL845)
●
Terry Schiazza and Rick Tanner are active members of the IEEE PC37.20.7 Working Group
•There currently
is no Standard or Guide for testing Low Voltage Motor Control Centers for internal arcing faults however based on recent decisions within IEEE, AR MCCs will now be covered in Annex H of the standard.
•The most important test parameters
for determining equipment capability
is establishing -
•The preferred rated arcing duration test (H.3)•The means of establish an arc to produce enough ionized gas quickly enough to prevent premature extinction at lower voltages (H.4)
•Current discussions within the working group indicate that the minimum arcing duration test will be no less than 100ms
Schneider Electric – SpecTech 2012, November Update 15
Low Voltage MCC
FlashGard (with arc flash features)
ArcShield (tested to C37.20.7-Type 2A)
Tiastar
(tested to C37.20.7-Type 2A,
UL test-validated)
Evolution E9000 (no advertised offer)
MNS (tested to C37.20.7)
Internal Arc Gas Management
Shroud Power Stabs
Vertical Bus Isolation
Ventilated Mid-Shelf
Model 6 Arc Resistant HighlightsTesting Standard
C37.20.7 (Annex H) UL witnessed
Reinforced Enclosure12 gauge steelAdditional hardware Metal Control Station PlateFilter box (VFD)Baffle compartment assembly
Ratings65 kAIR @ 600 VacType 2A100 ms (Stage 1)500 ms (Stage 2)2000A Bus (Stage 1)2500A Bus (Stage 2)
Optional Features Insulated BusAutomatic Bus ShuttersPlenums
Additional topmid bracket
Reinforced door
with hinges Additional bottom
mid bracket
Clip on FastLead Screws
Metal ControlStation Plate
Filter Box for Thermal Ventilation
Appendix