DGUV Information 203-078 - Thermal hazards from electric fault arc Guide to the ...

Online-Shop für Schriften

Jetzt bei uns im Shop bestellen

Jetzt bestellen
Annex 4 , PPE selection support form
Annex 4
Thermal hazards from electric fault arc Guide to the selection of personal protective equipment for electrical work (bisher: BGI/GUV-I 5188 E)

Anhangteil

Titel: Thermal hazards from electric fault arc Guide to the selection of personal protective equipment for electrical work (bisher: BGI/GUV-I 5188 E)
Normgeber: Bund
Amtliche Abkürzung: DGUV Information 203-078
Gliederungs-Nr.: [keine Angabe]
Normtyp: Satzung

Annex 4 – PPE selection support form

PPE Electric ARC Protection Class Calculation Form

Work order:Replace NH fuse
Responsible person:M. Mustermann
Work location:Transformer station 2
Main low voltage distribution system
Date:12.04.2012
Network voltage:400 V
Max. short-circuit current:23,10 kA
Min. short-circuit current:20,90 kA
Distance between conductors:60,0 mm
R/X ratio:
(Section 3.2)
0,2Rationale:none
Current limiting factor kB:
(Section 3.3)
0,38Rationale:none
Protection device:315 A gTr AC 400 V fuse (... manufacturer ...)
Tripping time of the protection device:0,100 sNote:Circuit breaker set value/trip time taken from protection characteristiv curve
Transmission factor kT:
(Abschnitt 3.4)
1,50Rationale:none
Distance of person from electric arc source location a:300 mm
Results: Isolate or take othe measures

The following measures would make work possible:
Shortening the upstream protection device trip time to < 0,039 s for PPE in Class 1 or to < 0,078 s for PPE in Class 2.
Increasing the working distance to > 481 mm for PPE in Class 1 ot to > 339 mm for PPE in Class 2.

Work order:Replace NH fuseResponsible person:John Doe
Work location:Transformer station 2
Main low voltage distribution system
Date:12.04.2012

Calculation   Parameter Result
Network parameterNetwork voltage U Nn 400,0 V
Equipment geometryDistance between conductors d 60 mm
Short-circuit current calculationmax. short-circuit current I'' k3pmax 23,10 kA
min. short-circuit current I'' k3pmin 20,90 kA
R/X ratio R/X 0,20
Current limitation k B 0,380 s
Minimum fault current I kLB = k B I'' k3pmin I kLB =7,94 kA
Overcurrent protection device trip time
(circuit breaker/trip time set value taken from the protection device characteristic curve)
t k 0,100 s
Short-circuit power S'' k = √(3) U Nn I'' k3pmax S'' k =16,00 MVA
Normalized arc power k P = 0,29/(R/X) 0,17 k P =0,381
Electric arc power P LB = k P S'' k P LB =6,10 MW
Electric arc energy (anticipated) W LB = k P S'' t k (Annahme: k P = k Pmax) W LB = 610,18 kJ
Working distance a 300 mm
Standardized PPE test level  W LBPKl2 =318,0 kJ
W LBPKl1 =158,0 kJ
Transmission factor k T 1,50
Protection level of clothing at the electric arc location (projection of Bo test parameters to the electric arc location) W LBä = k T (a/300 mm)2 W LBP W LBäKl2 =477,0 kJ
W LBäKl1 =237,0 kJ
 
Comparison W LB < W LBäKl1 nein
W LB < W LBäKl2 nein
 
Results: Isolate or take othe measures
 
Rationale for R/X ratio:
none
Rationale for currentlimiting factor:
none
Ratioale for transmission factor:
none
Protection device:
315 AgTrAC 400 V fuse (... manufacturer ...)

Deutsche Gesetzliche
Unfallversicherung e.V. (DGUV)

Mittelstraße 51
10117 Berlin
Tel.: 030 288763800
Fax: 030 288763808
E-Mail: info@dguv.de
Internet: www.dguv.de