20080421_IEEE-IAS_Generator_Arc_Flash_Presentation.pdf

8/14/2019 20080421_IEEE-IAS_Generator_Arc_Flash_Presentation.pdf

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Line 1 Line 2

molten metal

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light

shrapnelSound

wave

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vapor


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of PPE (Cal/cm^2)Hazard/Risk Category

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Source: "Analysis of Faulted Power Systems", Paul M. Anderson

An Emergency Generator's Reactance changes about 6 times faster than a Utility Generators.

6.80.162 Seconds1.1 SecondsTransient (d Axis)

5.20.0067 Seconds0.035 SecondsSub transient (d&q Axis)

RatioSmall (510 KW) Salient PoleLarge Turbo Solid RotorIncrement Time Constant


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-3000

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-1000

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1000

2000

3000

4000

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Alpha - Theta = 0 DegAlpha - Theta = 90 Deg


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BUS-1GEN 36.1 Cal/cm^2@ 18 inchesClass 4 PPE

CBL-1

BUS-2 MEDP-B 35.9 Cal/cm^2@ 18 inchesClass 4 PPE

PD-1 MAIN

CBL-2

BUS-3_MEDP-B

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@ 18 inchesClass 0 PPE

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CBL-3 CBL-4

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CBL-6

BUS-7

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FIGURE IV- AS FOUND (AC ONLY).tcc Ref. Voltage: 480 Current Scale x10^0

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0.010 - 0.030 Seconds0.010 - 0.030 SecondsMCCB - w/Low Inst Trip

0.001 - 0.004 Seconds0.004 - 0.008 SecondsFuse -CL w/Low

Threshold

0.030 - 0.040 Seconds8 - 12 SecondsMCCB w/Static Trip

0.010 - 0.030 Seconds8 - 12 SecondsMCCB w/Mag Trip

0.004 - 0.008 Seconds8 - 12 SecondsFuse - Current Limiting

0.010 - 0.800 Seconds8 - 12 SecondsFuse - Time Delay

Short Circuit Amps >10 xRating

Short Circuit Amps < 5 xRating

Over Current DeviceType

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20080421_IEEE-IAS_Generator_Arc_Flash_Presentation.pdf