MV design guide - Schneider Electric
MV design guide - Schneider Electric
MV design guide - Schneider Electric
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Standards<br />
IEC - ANSI comparison<br />
100<br />
90<br />
70<br />
50<br />
10<br />
Upeak (%)<br />
tc<br />
Onde coupée suivant ANSI<br />
pour le matériel d'extérieur<br />
t (µs)<br />
According to ANSI<br />
Rated Rated lightning Rated power frequency<br />
voltage withstand voltage withstand voltage<br />
(kV) (kV) 50 Hz 1 mm (kV)<br />
Indoor equipment<br />
4.16 60 19<br />
7.2 95 36<br />
13.8 95 36<br />
38 150 80<br />
Outdoor equipment<br />
15.5 110 50<br />
25.8 125 60<br />
150<br />
38 150 80<br />
200<br />
N.B.<br />
c BIL: Basic Insulation Level<br />
The outdoor equipment is tested with chopped waves.<br />
c The impulse withstand is equal to:<br />
1.29 BIL for a duration of tc = 2 µs<br />
1.15 BIL for a duration tc = 3 µs<br />
Rated normal current<br />
According to IEC<br />
c Values of rated current: 400 - 630 - 1250 - 1600 - 2500 - 3150 A<br />
According to ANSI<br />
c Values of rated current: 1200 - 2000 - 3000 A<br />
Short-time withstand current<br />
According to IEC<br />
c Values of short-circuit rated breaking capacity:<br />
6.3 - 8 - 10 - 12.5 - 16 - 20 - 25 - 31.5 - 40 - 50 - 63 kA<br />
According to ANSI<br />
c Values of short-circuit rated breaking capacity:<br />
v indoor equipment: 12.5 - 20 - 25 - 31.5 - 40 kA<br />
v outdoor equipment:<br />
Class (<strong>MV</strong>A)<br />
Breaking capacity (kA)<br />
I at Umax<br />
KI at Umin<br />
250 29 36<br />
350 41 49<br />
500 18 23<br />
750 28 36<br />
1000 37 46<br />
1500 21 35<br />
2750 40 40<br />
<strong>Schneider</strong> <strong>Electric</strong><br />
Merlin Gerin <strong>MV</strong> Design Guide<br />
73