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Planning the electrical installation 61

 Alternative 3: Single core cables with concentric protective shields

When single core cables equipped with concentric protective shields (metal) are used, the

phase current will induce voltage to the cable shield. If the shields are connected to each

other at both ends of the cable, current will flow in the cable shield. In order to prevent this

and to ensure personal safety, the cable shield must be connected only to PE at the

transformer side and insulated on the converter side. The connection is represented

below.

Selecting the rotor cabling principle

Only use three-phase symmetrical cables between the converter and the rotor. For the

possible rotor cable shield constructions, see section Rotor cable shield on page 57.

Rotor cable connections with parallel symmetrical cables are shown below.

For information on how to change the rotation direction of the generator, see ACS800-

67LC system description and start-up guide [3AUA0000059432 (English)].

Transformer Converter

Wind turbine main earthing busbar

Concentric shield

Rotor-side converter

3 ~

Output

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ABB ACS800-67LC User Manual

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