Workshop Arc Flash

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Smart Water for Smart Cities Arc Flash Mitigation Enhancing Personnel Safety Terry L. Schiazza Low Voltage Offer Marketing Seneca (SC) Plant Sponsored by the Water Wastewater Competency Center Columbus, OH May 2013

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Transcript of Workshop Arc Flash

Page 1: 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

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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

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Arc Flash Video

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Picture from Schneider Electric 484EN Guide (Internal arc guide, theory and phenomena)

Arc Flash Characteristics

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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

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Arc Flash Video

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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

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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.

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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)

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ArcBlok Patented TechnologyInternal Arc Gas Management System

Prevents and Controls Arcing Cluster Shields

Cradle Barriers

Arc Ventilation

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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

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●What is the Standard for Low Voltage Motor Control Centers?

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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

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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)

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Internal Arc Gas Management

Shroud Power Stabs

Vertical Bus Isolation

Ventilated Mid-Shelf

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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

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Appendix