ELECTRICAL ARC FLASH HAZARD STUDY APRIL 2008 Industry Division División Industria Your success is our aim Su éxito es nuestro objetivo
VIDEO – LIBERATION OF ENERGY
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
AGENDA
Topics to Covering:
Electrical Arch We are exposed? Applicable Regulations ArcFlash Estudio Riesgos Study ofde Risks
Risks Incidents Arc Flash Study
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ArcFlash What´s this?
Electrical
Traffic of current across the body for
Direct contact Indirect contact
Accident
ArcFlash
ArcFlash Estudio Riesgos Study ofde Risks
It is a short circuit across the air, produced when : The insulation between two energized drivers collapses The same between a wire and earth, provoking an explosion for the liberation of energy
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
VIDEO II – ARC in 500 kV
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Accidents of ArcFlash Where they can happen ? Areas with High Risk of Occurrence Distributions Panels MV / LV
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Center Control of Engines
Electrical Engines
Areas with high temperatures
Our Offer His Purpose ….
The Purpose of Our Study To minimize the ocurrence and consequence of accidents for ArcFlash To determine reliable procedures of operation ArcFlash Estudio Riesgos Study ofde Risks
To define levels of appropiate PPE
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
To normalize a program of permanent training
¿WE ARE EXPOSED?
¿WE ARE ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
EXPOSED?
¿WE ARE EXPOSED?
ArcFlash Estudio Riesgos Study ofde Risks
Isn’t this a common situation in your plant? Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
¿WE ARE EXPOSED?
ArcFlash Estudio Riesgos Study ofde Risks
Isn’t this a common situation in your plant? Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
¿WE ARE EXPOSED?
ArcFlash Estudio Riesgos Study ofde Risks
Isn’t this a common situation in your plant? Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ARC FLASH REASONS
The contact with parts under voltage for fall of tools Insulations fault Overvoltage Dirt ArcFlash Estudio Riesgos Study ofde Risks
Corrosion Condensation
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NORMS
NORMS ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ARCFLASH Applicable Regulations
Applicable Regulations :
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ARCFLASH Applicable Regulations
Applicable Regulations :
NFPA
70E Part II Articles 110 and 130 require a flash hazard analysis be performed to protect qualified electrical personnel
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
National
Electrical Code NFPA 70 Article 110.16 requires equipment be marked to warn personnel of arc flash hazards
ARCFLASH Applicable Regulations Applicable Regulations :
OSHA 29CFR1910.269(I)(6) discusses appropriate PPE apparel to protect against arc flash hazards
The ArcFlash Estudio Riesgos Study ofde Risks
2004’ s version of IEEE 1584a provides precise methods for ArcFlash 's calculation. Procedures and safeties measurements specified by each company
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
RISKS
RISKS ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Electrical Arc Flash Hazards
Produce thermal energy that is released during a fault and is a function of: Available fault current and system voltage Distance from fault Clearing time of protective device
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
May generate higher energy at lower system voltages (due to longer time arc fault current duration)
TYPES OF RISKS FOR ARC FLASH
There are principally five ways in which an electrical ArcFlash can to cause damage and even the death: Thermal Risk
Risk of Pressure ArcFlash
Risk of Hearing
Estudio Riesgos Study ofde Risks
Risk for Missiles Risk for Inhalation Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ARCO ELECTRICO
20.000 °C
Molten Metal Waves of Pressure
Waves of sound
ArcFlash Estudio Riesgos Study ofde Risks
Steam of Copper: Occurred to Steam It expands to factor of 67.000 times
Missil Warm air Rapid expansion Intense Light
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INCIDENTS of ARCFLASH
INCIDENTS ArcFlash Estudio Riesgos Study ofde Risks
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INCIDENTES POR ARCFLASH
ArcFlash Estudio de Riesgos
División Industria Su éxito es nuestro objetivo
INCIDENT for ARCFLASH
ArcFlash’ s Incident System of 480Volt 22,600 Amper Symmetrical Current
ArcFlash
Panel of Motor’s Control
Estudio Riesgos Study ofde Risks
It comes out of 6 cycles (0.1 sec)
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ArcFlash Estudio de Riesgos
División Industria Su éxito es nuestro objetivo
RESULT OF AN ACCIDENT FOR ARCFLASH
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
INCIDENT for ARCFLASH
INCIDENT for ARCFLASH 480 Volt System 22,600 22,600A Symmetrical Current Panel of Motor’s Control Limiter equipment with < ½ cycle of operation (.0083 sec). ArcFlash Estudio Riesgos Study ofde Risks
To notice that the exhaust will have to be kept in the range of limit of current
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ArcFlash Estudio de Riesgos
División Industria Su éxito es nuestro objetivo
VIDEO
ARC FLASH ’s INCIDENT ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
VIDEO
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
AGENDA
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ARC FLASH STUDY
WHAT IS A STUDY OF RISK FOR ARC FLASH?
Definition: The NFPA 70E defines a study of risks for ArcFlash as : “A study where is investigated the potential exhibition of a workman to the energy caused by an electrical arch With the aim of: ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
¾
To anticipate injuries ,
¾
To determine sure procedures of operation ,
¾
Levels of appropriate PPE .”
WHAT IS THE MINIMAL DISTANCE OF PROTECTION ? Definition: The NFPA 70E defines a minimal distance of protection as:
“Distance, from the critical point, inside which a person can suffer burns of second degree due to an accident for Arc Flash .” ArcFlash Estudio Riesgos Study ofde Risks
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PPE as cal/cm2
PPE Selection Protective Clothing Guidelines, from “Predicting Incident Energy to Better Manage the Electric Arc Hazard on 600V Power Distribution Systems,” Table III, IEEE Transactions on Industry Applications, Jan./Feb. 2000 Proposed Protective Clothing Classes
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
FR Clothing System
Range of Calculated Incident Energy (cal/cm²)
Clothing Class No.
0–2
0
Untreated Cotton (1)
4.5 – 7
2-5
1
FR Shirt and Pants (1)
4.5 - 8
5-8
2A
Cotton Underwear plus FR Shirt and Pants (2)
9 - 12
5 - 16
2B
FR Underwear plus FR Shirt and Pants (2)
10 - 14
8 - 25
3
Cotton Underwear plus FR Shirt and Pants plus FR Coverall (3)
16 - 20
25 - 40
4
Cotton Underwear plus FR Shirt and Pants plus Double Layer Switching Coat (4)
24 - 30
Clothing Description, (No. of Layers)
Total Weight (oz/yd²)
Flash hazard label (one per analysis point)
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Electrical Arc Flash Hazard Study Customer to Provide:
One line diagram of power delivery system Current copy of power system short circuit study and coordination study Single point of contact to establish each analysis point with our power systems engineer ArcFlash Estudio Riesgos Study ofde Risks
Input on typical working distances desired for each location or default to applicable standards Purchase order authorizing Siemens to proceed
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
SUMMARY
Siemens Solutions :
ArcFlash Estudio Riesgos Study ofde Risks
Step #1:
Generation/Review of unifilar complete of the plant
Step #2:
The short circuit study of the energy system.
Step #3:
Analysis of the current state of the protection system
Step #4:
Coordination study of the protection system.
Step #5:
Electrical Arc Flash Hazard Study.
Step #6:
Identify equipment locations that exceed available PPE ratings
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Step #7:
Presentation of the Program of Electrical Security
Step #8:
Annual maintenance Your success is our aim
Electrical Arc Flash Hazard Study Sample of Customer Deliverable : Arc Energy calculations Example Customer
Summary of Incident Energy Calculations
Incident Energy in cal/cm 2 and Working Distance Marzo 18, 2004
ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
Location 12.47 kV Main Switchgear Unit Sub #1 480 V Main Breaker Unit Sub #1 480 V Bus MCC A MCC B Panel 16
Voltage kV 12,47 0,48 0,48 0,48 0,48 0,48
Normal Operation J/cm2 129,2 474,4 55,3 84,1 64,5 52,5
Normal Operation cal/cm2 30,9 113,4 13,2 20,1 15,4 12,5
Working Distance inches 36,0 24,0 24,0 12,0 12,0 12,0
Arc Flash Boundary feet 84,5 43,9 10,2 5,6 4,7 4,2
Electrical Arc Flash Hazard Study Customer Benefits Reduced risk of employee injury or death due to arc flash hazards Possible revisions to customer system protection to limit equipment damage
ArcFlash Estudio Riesgos Study ofde Risks
Provides critical safety information for subcontractors entering facility Possible reduction in workers compensation and insurance claims Demonstrates company effort to satisfy OSHA and NFPA regulations
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A BENEFICIAL RELATION
ArcFlash Estudio Riesgos Study ofde Risks
Thank you very much for your attention. Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
ENERGY CONTACTS in ARGENTINA – Arc Flash
Pablo Donajger
[email protected] 0054 - 011 - 4738 7333 Pablo David
[email protected] ArcFlash Estudio Riesgos Study ofde Risks
Industry Division División Industria Su éxito es nuestro objetivo Your success is our aim
0054 – 011 - 4738 7209
