Enhancing Personnel Safety with Arc Resistant Equipment

Transcription

1 Enhancing Personnel Safety with Arc Resistant Equipment Carl Christian Power LV Offer Marketing Nashville, TN Sponsored by the Water Wastewater Competency Center 1

2 Enhancing Personnel Safety 5-10 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 2000 Each year 2000 patients are emitted to burn centers due to arc flash events. -Report by research on IEEE Website 2

3 Specifying Arc Resistant Confusing? Plenums Baffles Insulated bus Ventilators Bellows AMS Arc Latches C Ceiling Height Type 2 ArcShield ZSI Bus Differential Type 2B 3

4 Let Schneider Electric Simplify 4

5 Arc Flash Mitigation Solutions Passive Protection Virtual Mains Zone Selective Interlocking Bus Differential Relays Low Arc Flash CB High Resistance Grounding Arc Flash Sensing Relay- VAMP technology AF Prevention (Avoidance) System (Equipment) Design De-energize Equipment Site Safety Procedures Intelligent MCCs Remote Racking LV Power CBs Electric Operated CBs Passive Containment Energy Redirection Installation Considerations Plenums (ductwork) Size of Equipment Equipment location Active Protection Arc Flash Sensing Relay with Arc Quenching technology Interactive Protection Arc Flash Energy-Reducing Maintenance Switches 5

6 Low Voltage Arc Resistant Power-Zone 4 Switchgear

7 Arc Flash Characteristics Picture from Schneider Electric 484EN Guide (Internal arc guide, theory and phenomena) 7

8 Low Voltage Switchgear Standards IEEE Standard C IEEE guide for testing metalenclosed 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. 8

9 Power-Zone 4 Arc Resistant Highlights Testing Standard C , UL Witnessed and Certified Reinforced Enclosure Compartmentalized 4 High Construction 60 D minimum Baffle compartment assembly Ratings 5000A Bus and 5000A Breaker 100 kair up to 635 Vac Type 2B 9

10 PZ-4 AR Highlights Breaker and Cradle Masterpact ArcBlok TM (patented design) Cell Keying Optional Features Insulated Bus Plenums Zone Selection Interlocking High Resistant Grounding Energy Reduction Maintenance Switch (AMS) Breaker Remote Racking 10

11 ArcBlok Technology Patented Technology Phase to Phase & Phase to Ground Isolation Arc Transfer Maximum Heat Transfer 11

12 Air Intake Design Optimized Air Flow Dynamic Spring Loaded Pressure Flap 12

13 Exhaust Methods - Baffles Roof Baffles 14 Guage Steel Exhaust Flap Louvered 10 ft. Clearence Ceiling Base of Equipment 13

14 Exhaust Method - Plenums UL Witnessed and Certified Seismically Qualified Maximum Heat Transfer 14

15 Plenums 15

16 Arc Resistant LV Model 6 MCC

17 Low Voltage Motor Control Center A Standard Dilemma.Resolved 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 G of the standard. The most important test parameters for determining equipment capability is establishing - The preferred rated arcing duration test (G.3) The means of establish an arc to produce enough ionized gas quickly enough to prevent premature extinction at lower voltages (G.4) Current discussions within the working group indicate that the minimum arcing duration test will be no less than 100ms IEEE PC , Draft 2 Oct. 2012, Annex G 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 PC Working Group 17

18 Model 6 Arc Resistant Highlights De facto Testing Standard C (Annex G) Reinforced Enclosure Reinforced Structure 72 in Mounting w/ 3 in spacing Metal Control Station Plate Filter box (VFD) Metal Control Baffle compartment assembly Station Plate Additional top mid bracket Filter Box for Thermal Ventilation Reinforced door with hinges Clip on Fast Additional bottom Lead Screws mid bracket 18

19 Model 6 Arc Resistant Highlights Ratings Vac Type ms 2000A Bus Optional Features Insulated Bus Automatic Bus Shutters Plenums Infrared Viewing Windows 19

20 Arc Resistant Features Metal Control Station Plate Reinforced Construction 12 Gauge Steel Metal Control station Robust mounting Hardware New VFD Filter Box Filter Box for Thermal Ventilatio Reinforced door with hinges 20

21 AR Mid-Shelf Sealing flanges Vents on the top are used to transfer the arc Vent geometry is optimized for maximum heat transfer 21

22 Exhaust Options Pull Box Plenum Ceiling or obstruc8on above MCC Plenum UL Witnessed Plenum Design Top Entry thru Pull Box Single Plenum Baffle in in 120 in. Minimum height from bo5om of sec8on to obstruc8on above MCC Pull Box Front Rear 22

23 Arc Flash Options Intelligent MCC Allows monitoring/commissioning/adjusting of MCC with doors closed Remote software interface available to access MCC data remotely without Personnel Protective Equipment (PPE) Provides preventative and predictive maintenance information over popular protocols to reduce need for personnel entry into equipment. Energy information and event logging available via web access anywhere. Ethernet TCP/ IP 23

24 What Questions Do You Have 24