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400 Hz Ground Power Cables 5 kV Airfield Lighting Cables - Leoni

400 Hz Ground Power Cables 5 kV Airfield Lighting Cables - Leoni

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Kabelsysteme zur Versorgung von Flugzeugen<br />

Technische Informationen<br />

Distanz zwischen den Leitern<br />

Distance between cores<br />

Asymmetrisches Kabel 4-Leiter<br />

Unbalanced cable 4-core<br />

a1 = a2<br />

a3 = a1 × ��2<br />

Ersatzschaltbild pro Phasenstrang<br />

Equivalent circuit diagram per phase<br />

Symmetrisches Kabel 3-Leiter<br />

Symmetrical cable 3-core<br />

a1 = a2 = a3<br />

Fig. 3 Fig. 4 Fig. 5<br />

R<br />

a1 S<br />

für asymmetrische Kabel 4-Leiter und symmetrische Kabel 3-Leiter<br />

for unbalanced cables 4-core and symmetrical cables 3-core<br />

U1<br />

U1 = Eingangs-Spannung / Input voltage<br />

U2 = Ausgangs-Spannung / Output voltage<br />

R = Ohmscher Widerstand / Ohmic resistance<br />

D = Leitungslänge / Cable length<br />

XL = Induktiver Widerstand / Inductive reactance<br />

Induktivität<br />

� Distanz a und Radius r werden zur Berechnung der Induktivität gebraucht.<br />

� Je grösser die Distanz a, desto grösser die Induktivität.<br />

� 4-Leiter-Kabel (Fig. 3) sind wegen zu grossem Spannungsverlust ab 15 m<br />

Kabellänge nicht mehr zu empfehlen.<br />

Symmetrischer Spannungsabfall<br />

� Unterschiedliche Distanz zwischen den Leitern führt zu unterschiedlichen<br />

Induktivitäten (siehe Tabelle).<br />

� Symmetrisches Kabeldesign (Fig. 4 und 5) bringt optimale Voraussetzungen<br />

für einen kleinen und gleichmässigen Spannungsverlust.<br />

Volt<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

N<br />

September 2009 www.leoni-airport.com<br />

a3<br />

R XL<br />

4-core cable 70 mm²<br />

D<br />

T<br />

a2<br />

3-core cable<br />

Deltaflex 70 mm²<br />

r<br />

I<br />

U2<br />

4-core cable 70 mm²<br />

T<br />

a1<br />

3-core cable<br />

Deltaflex 70 mm²<br />

� phase / N � Umax / Umin<br />

R<br />

a3<br />

a2<br />

S<br />

r<br />

<strong>Ground</strong> power cable systems<br />

Technical information<br />

U1<br />

Symmetrisches Kabel 7-Leiter<br />

Symmetrical cable 7-core<br />

a1 = a2 = a3 = a4<br />

für symmetrische Kabel 7-Leiter<br />

for symmetrical cables 7-core<br />

R XL<br />

R XL<br />

Inductivity<br />

� Distance a and radius r are used to calculate the inductivity.<br />

� As larger the distance a as larger the inductivity.<br />

� 4-core cable design (Fig. 3) is not recommended for cable length > 15 m because<br />

of large voltage drop.<br />

Symmetrical voltage drop<br />

� Different axial distances between cores can result to different values of inductivities<br />

(see table).<br />

� Symmetrical cable design (Fig. 4 and 5) results to optimal and constant voltage<br />

drop characteristics.<br />

Asymmetrisches Kabel, 4-Leiter, 70 mm²<br />

Unbalanced load, 4-core, 70 mm²<br />

cos� = 0,8<br />

f = <strong>400</strong> <strong>Hz</strong><br />

D = 20 m<br />

IA = 240 A<br />

IB = 255 A<br />

IC = 125 A<br />

Symmetrisches Kabel, 3-Leiter, 70 mm²<br />

Symmetrical load, 3-core, 70 mm²<br />

cos� = 0,8<br />

f = <strong>400</strong> <strong>Hz</strong><br />

D = 20 m<br />

IA / IB / IC = 270 A<br />

T<br />

R<br />

S<br />

a1<br />

a2 a4<br />

D<br />

S<br />

R<br />

a3<br />

T<br />

I<br />

U2<br />

37

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