AC Cable Sizing

[bendesa]

Hi all,

I've a question about cable sizing for big MW PV Systems.

For example the following PV System.

PV Capacity 940,680 Watt

13 x Huawei SUN2000 KTL 60 KW

2808 x Seraphim 335 Wp Poly

156 Strings

AC Side

All Inverters are connected with an ACDP by NYY Cable 4C x 35mm2 N L1 L2 L3

All inverters are grounded by NYA Cable 1C x 16mm2 from inverter to grounding bus bar in the ACDP

Average distance from Inverter to ACDP 10 Meter

The ACDP is connected with a MDP Distance from ACDP to MDP 60 Meters

How do I size the necessary cables for L1, L2, L3 and Neutral and Grounding for the connection between the ACDP and the MDP?

The AC cables will be in AC Cable ladders inside the building

Surrounding temperature around 30 degrees Celsius

I hope someone can explain this to me.

Thank in advance for your contribution

Kind regards

 

[tortuga]

Hi all,

I've a question about cable sizing for big MW PV Systems.

What electrical regulations apply to the installation? Does it fall under US standards?

For example the following PV System.
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All Inverters are connected with an ACDP by NYY Cable 4C x 35mm2 N L1 L2 L3

NYY Cable sounds like an EU/German cable.

 

[Julius Right]

According to BS 7671 TABLE 4D2A 3*35 mm^2 NYY withstand 99 A in conduits on wall at 30o ambient .
For ACDP to MDP 4 cables of 3+1 conductors of 300 mm^2 withstand 4*339=1356 A
in the same conditions and 1% voltage drop at 60 m.