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Su xito es nuestro objetivo

ELECTRICAL ARC FLASH

HAZARD STUDY

APRIL 2008

Industry Division

Your success is our aim


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ArcFlash

Estudio de Riesgos

VIDEO LIBERATION OF ENERGY

Study of Risks

Industry Division



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ArcFlash

Estudio de Riesgos

Electrical Arch

We are exposed?

Applicable Regulations

Risks

Incidents

Arc Flash Study

AGENDA

Topics to Covering:

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ArcFlash

Estudio de Riesgos

ArcFlash

Whats this?

Electrical

Accident

Traffic of current

across the body for

ArcFlash

Direct contact

Indirectcontact

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 theliberation of energy

Study of Risks

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ArcFlash

Estudio de Riesgos

VIDEO II ARC in 500 kV

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ArcFlashEstudio de Riesgos

Accidents of ArcFlashWhere they can happen ?

Distributions

Panels

MV / LV

CenterCenter

Control ofControl of

EnginesEngines

ElectricalElectrical

EnginesEnginesAreasAreas withwith

highhigh

temperaturestemperatures

Areas with HighHigh

Risk of OccurrenceRisk of Occurrence

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Our Offer

His Purpose .

To minimize the ocurrence and consequence of accidents

for ArcFlash

To determine reliable procedures of operation

To define levels of appropiate PPE

To normalize a program of permanent training

The PurposePurpose of

Our StudyOur Study

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WE ARE EXPOSED?

WE AREEXPOSED?Study of Risks

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WE ARE EXPOSED?

Isnt this a common situation in your plant?

Study of Risks

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WE ARE EXPOSED?


Study of Risks

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WE ARE EXPOSED?


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ARC FLASH REASONS

The contact with parts under voltage for fall of tools

Insulations fault

Overvoltage

Dirt

Corrosion

Condensation

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NORMS

NORMSStudy of Risks

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ARCFLASHApplicable Regulations

Applicable Regulations :

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NFPA 70E Part II Articles 110 and 130

require a flash hazard analysis be performed

to protect qualified electrical personnel

National Electrical Code NFPA 70 Article

110.16 requires equipment be marked to warnpersonnel of arc flash hazards

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OSHA 29CFR1910.269(I)(6) discussesappropriate PPE apparel to protect against

arc flash hazards

The 2004 s version of IEEE 1584a

provides precise methods for ArcFlash 's

calculation.

Procedures and safeties measurements specified

by each company



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RISKS

RISKSStudy of Risks

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Produce thermal energy that is released during a faultand is a function of:

Available fault current and system voltage

Distance from fault

Clearing time of protective device

May generate higher energy at lower system voltages

(due to longer time arc fault current duration)

Electrical Arc Flash Hazards

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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

Risk of Hearing

Risk for Missiles

Risk for Inhalation

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ARCO ELECTRICO

Waves of Pressure

Steam of Copper:

Occurred to

Steam It expandsto factor of

67.000 times

Molten Metal

Intense Light

Warm air

Rapid expansion

20.000C

Missil

Waves of sound

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INCIDENTS of ARCFLASH

INCIDENTSStudy of Risks

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INCIDENTES POR ARCFLASH


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INCIDENT for ARCFLASH

ArcFlash s Incident

System of 480Volt

22,600 Amper Symmetrical Current

Panel of Motors Control

It comes out of 6 cycles (0.1 sec)

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RESULT OF AN ACCIDENT FORARCFLASH

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480 Volt System

22,600 22,600A Symmetrical Current

Panel of Motors Control

Limiter equipment with < cycle of operation (.0083 sec).

To notice that the exhaust will have to be kept in the range

of limit of current


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VIDEO


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VIDEO

ARC FLASH s INCIDENTStudy of Risks

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VIDEO


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VIDEO

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AGENDA


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AGENDA

ARC FLASHSTUDY

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WHAT IS A STUDY OF RISK FOR ARC FLASH?


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WHAT IS A STUDY OF RISK FOR ARC FLASH?

Definition:

The NFPA 70E defines a study ofrisks for ArcFlash as :

A study where is investigated the potential exhibition

of a workman to the energy caused by an electrical

arch

To anticipate injuries ,

With the aim of:

To determine sure procedures of operation ,

Levels of appropriate PPE .

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WHAT IS THE MINIMAL DISTANCE OF


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PROTECTION ?

Definition:

The NFPA 70E defines a minimal distance of protection as:

Distance, from the critical point, inside which aDistance, from the critical point, inside which a

person can suffer burns of second degree due toperson can suffer burns of second degree due to

an accident for Arc Flashan accident for Arc Flash ..

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PPE as cal/cm2


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PPE as cal/cm2

PPE Selection

Range of Calculated Incident

Energy (cal/cm)

Clothing

Class No. Clothing Description, (No. of Layers)

Total Weight

(oz/yd)

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 4Cotton Underwear plus FR Shirt and Pants plus

Double Layer Switching Coat (4)24 - 30

Protective Clothing Guidelines, from Predicting Incident Energy to Better Manage the Electric Arc Hazard on 600-

V Power Distribution Systems,Table III, IEEE Transactions on Industry Applications, J an./Feb. 2000

Proposed Protective Clothing Classes FR Clothing System

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Your success is our aim Flash hazard label


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(one per analysis point)

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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

Input on typical working distances

desired for each location or default toapplicable standards

Purchase order authorizing Siemens to

proceed

Electrical Arc Flash Hazard Study

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SUMMARY


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SUMMARY

Siemens Solutions :

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 #1: Generation/Review of unifilar complete of the plant

Step #5: Electrical Arc Flash Hazard Study.

Step #6: Identify equipment locations that exceed available

PPE ratings

Step #7: Presentation of the Program of Electrical Security

Step #8: Annual maintenance

Your success is our aimYour success is our aim

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Sample of Customer Deliverable :


Arc Energy calculations

Example Customer Summary of Incident Energy CalculationsIncident Energy in cal/cm2 and Working Distance

Marzo 18, 2004Voltage

Normal

Operation

Normal

Operation

Working

Distance

Arc Flash

Boundary

Location kV J/cm2 cal/cm2 inches feet

12.47 kV Main Switchgear 12,47 129,2 30,9 36,0 84

Unit Sub #1 480 V Main Breaker 0,48 474,4 113,4 24,0 43

Unit Sub #1 480 V Bus 0,48 55,3 13,2 24,0 10MCC A 0,48 84,1 20,1 12,0 5

MCC B 0,48 64,5 15,4 12,0 4

Panel 16 0,48 52,5 12,5 12,0 4

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Study of Risks

Customer Benefits

Reduced risk of employee injury or death due to arc flashhazards

Possible revisions to customer system protection to limit

equipment damage Provides critical safety information for subcontractorsentering facility

Possible reduction in workers compensation andinsurance claims

Demonstrates company effort to satisfy OSHA and NFPAregulations

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A BENEFICIAL RELATION

Thank you very much for your attention.

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ENERGY CONTACTS inARGENTINA Arc Flash


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ARGENTINA Arc Flash

Pablo Donajger

[email protected]

0054 - 011 - 4738 7333

Pablo David

[email protected]

0054 011 - 4738 7209Study of Risks

Industry Division

mailto:[email protected]:[email protected]:[email protected]:[email protected]

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