1 LITTELFUSE STARTCO Littelfuse Startco Arc Flash Relay PGR-8800

  • View

  • Download

Embed Size (px)

Text of 1 LITTELFUSE STARTCO Littelfuse Startco Arc Flash Relay PGR-8800

  • Slide 1

1 LITTELFUSE STARTCO Littelfuse Startco Arc Flash Relay PGR-8800 Slide 2 2 LITTELFUSE STARTCO Arc Faults: Costly and Dangerous Dangers Fires Burns Injury Death Costs Collateral damage Equipment replacement Downtime Labour Slide 3 3 LITTELFUSE STARTCO Arc Flash / Blast Statistics Over 1000 people die each year from electrical accidents* Up to 10 Arc-Flash incidents occur each day in the US Over 2000 workers are sent to burn centers each year with severe Arc-Flash burns. OSHA states that 80% of electrically related accidents and fatalities among Qualified Workers are caused by Arc- Flash/Arc-Blast Incidents. * Source: National Safety Council Slide 4 4 LITTELFUSE STARTCO Case Study Nov 12, 2009 Chiller Easton Ice Rink, Columbus, Ohio An electrician was working on a 480V power panel when the panel sparked and caught fire The electrician was thrown to the floor and eventually transported to the OSU Burn Center with severe burns on face and hands. Witnesses reported the panel was still sparking when the fire crews arrived. * Source: Dayton Daily News Slide 5 5 LITTELFUSE STARTCO Electric Shock - trauma caused by the passage of electric current through the body. Arc-Flash an unexpected sudden release of intense heat and light energy produced by electricity traveling through air, usually caused by accidental contact between live conductors. Arc-Blast - a pressure wave created by heating, melting, vaporization, and expansion of conducting material and surrounding air during an Arc-Flash. Types of Electrical Hazards Slide 6 6 LITTELFUSE STARTCO Types of Electrical Hazards Arc-Blast Gases Sound Arc-Flash Light Fire Shock Pressure Wave Slide 7 7 LITTELFUSE STARTCO Severe burns Vision damage or blindness Hearing loss Broken bones or internal organ damage Whiplash Brain injuries Lacerations Fatality Photos courtesy of OSHA Effects of Electrical Hazards on Workers Slide 8 8 LITTELFUSE STARTCO Costly Damage Equipment replacement and need for capital Equipment repair costs Downtime Production Loss (scrap) and business interruption. Image from IEEE Electrical Safety Workshop, Floyd, Doan, Barrios, Wellman Image from IEEE Electrical Safety Workshop, H. Landis Floyd, II Effects of Electrical Hazards on Business Slide 9 9 LITTELFUSE STARTCO System Voltage Arc Characteristics Arc gap / Distance from arc Fault Current Available fault current Arc current typically 38% of available fault current Time Clearing time Image from OSHA Office of Training & Education What Determines Arc-Flash Severity? Slide 10 10 LITTELFUSE STARTCO Initiators of these faults IEEE Std 493-1997 (Gold Book) Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems Slide 11 11 LITTELFUSE STARTCO Development of an Arc Fault Voltage difference between two conductors (250V) separated by air gap, high resistance Voltage reaches breakdown point, rapid release of energy across gap Shortest distance from bus bar corner to bolt corner Usually phase-to-phase or phase-to-ground Energy limited only by system resistance, air gap impedance Slide 12 12 LITTELFUSE STARTCO Lifespan of an Arc Fault 1. 2. 3. 4. 5. 6. Slide 13 13 LITTELFUSE STARTCO Lifespan of an Arc Fault 50 kA bolted fault between 480 Vac and ground Slide 14 14 LITTELFUSE STARTCO Effects of an Arc Fault Plenty of Hazards to Choose From Slide 15 15 LITTELFUSE STARTCO Examples of Arc Faults Slide 16 16 LITTELFUSE STARTCO Arc Flash Relay PGR-8800 Series 1ms reaction time Detects light Point sensors (A) Fiber optic sensor (B) Detect over-currents Phase CTs (3) Any CT with 5A sec. Link upto (4) AF Relays Larger systems Slide 17 17 LITTELFUSE STARTCO PGR-8800 Functions & Features Six light sensors Built-in front sensor Adjustable light sensitivity 1000 event logging Dual inputs for switches or PLC Fail-safe operation Local USB interface No drivers or s/w reqd Slide 18 18 LITTELFUSE STARTCO PGR-8800 Wiring Diagram Slide 19 19 LITTELFUSE STARTCO PGA-LS10 - Point Sensors The sensor can be also be mounted to see through the back of the cabinet. 120% 80% Coverage Half-Circle 100% Range is 2 to 2.5 meters 360 Point Sensor Slide 20 20 LITTELFUSE STARTCO PGA-LS20 - Fiber-Optic Sensors One fiber-optic sensor can replace several point sensors 26 ft flexible fiber 360 detection angle LED for visual feedback Built-in circuit check Electrically extendable Plug-in connector Slide 21 21 LITTELFUSE STARTCO Multi-Unit Installation Example Slide 22 22 LITTELFUSE STARTCO PGR-8800 Applications Transformer primary 3 x 690 V Transformer secondary 3 x 22 kV Air-cooled transformers are sensitive to contaminants, affecting the resistance of the air gap between electrical connections (phases, bolted connections etc.) Slide 23 23 LITTELFUSE STARTCO PGR-8800 Applications Slide 24 24 LITTELFUSE STARTCO Additional Information www.startco.ca/arcflash Datasheet Product Manual Brochure Arc Flash Relay Brochure PF136 Datasheet Littelfuse Startco: 306-373-5505