2 What is an fault arc - Die BG ETEM
2 What is an fault arc - Die BG ETEM
2 What is an fault arc - Die BG ETEM
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Annex 6<br />
64<br />
Working place Behind house connecting box<br />
Electrical data:<br />
UnN 400 V<br />
IN 63 A<br />
I"k3p 4 kA 2 kA 1 kA<br />
S"k 2.771 MVA 1.386 MVA 0.693 MVA<br />
Protection device fuse NH 63 A gG<br />
current attenuation factor kB<br />
0.50<br />
Fault current IkLB = kB * I″k3 2 kA 1 kA 0.5 kA<br />
clearing time from character<strong>is</strong>tic with<br />
IkLB (Fig. A6.2) tk 10 ms 18 ms 300 ms<br />
Normalized <strong>arc</strong> power kP<br />
(LV: 0,22 … 0,27)<br />
Arc energy expected<br />
0.25<br />
W<strong>arc</strong> = kp * 1.73 * UrN * I″k3p * tk 6.93 kJ 6.24 kJ 51.96 kJ<br />
Determination of the equivalent<br />
energy Class 1 Class 2<br />
Test level of <strong>arc</strong> energy 158 kJ 318 kJ<br />
Tr<strong>an</strong>sm<strong>is</strong>sion coefficient kT<br />
kT = 1 small compartments or narrow<br />
side <strong>an</strong>d back walls<br />
kT = 2.4 open <strong>arc</strong><br />
Working d<strong>is</strong>t<strong>an</strong>ce a to the active parts<br />
PPE protection level at work place<br />
300 mm<br />
Wprot = kT *(a/300 mm) 2 * W<strong>arc</strong>P 158 kJ 318 kJ<br />
Dec<strong>is</strong>ion for the PPE 6.93 kJ < 158 kJ 6.24 kJ < 158 kJ 51.96 kJ < 318 kJ<br />
(W<strong>arc</strong>
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