Input Output Cables for 560kW VFD Panel

Please provide the following data on the motor and the VFD:

What is the full load current?

What is the power factor?

What is the efficiency?

Thank you very much for the response. I am sorry I could not respond as I was away. Following is the details:

Motor: 520KW, 415V,50HZ, 994 RPM, 880A

VFD: 560KW, 960A, 415V, 50HZ PF can be adjusted to 1.0

Thanks again.

Do we have any advantage of using separate single core cables for input side?

You may use separate single core cables, as long as they are the correct size for the input. In most cases 3 core shielded cables are used.

Do we have to use shielded cable for input side also or armored is OK?

From experience I have installed shielded cables for power supply and controls. Shielded cables are required where the cables are run near/along side other power cables, where magnetic effect from other cables may affect the supply on the controls cables/power cables.

Please suggest whether our selection of type of cable, no of runs is OK or need some change.

Please provide data on full load current, power factor, and efficiency of motor and VFD. Knowing your motor full load current, you may select the right cable which can be installed at a depth of 0.5 to 1 meter and still be able to supply the required full load current of the motor, at the required efficiency and power factor. Look up cable selection books and importantly the VFD manual for installation guides.

Instead of trusting complete strangers on the internet, why not employ a local engineer that knows your local codes.

Srinivasan,

The cable selection seems fine given our Indian power conditions. Although you can use a three core cable, the cable size would be quite large in cross section. A single core 630 sq. mm copper cable should be able to give you 1254 amps current under open air / conductors in conact with each other and at 70 deg conductor temperature and an ambient of 30 deg. C for type N2XH power cables. Ambient rising to 45 deg. should not pose a problem with 3 runs of 240 sq. mm per phase. Source: HELUKABEL gmbH

Do not overlook a filter on the input & output side for suppression of harmonics. Shielded cable gives you further protection in terms of EMI / EMC. Surge protection devices if planned would also benefit you in the long run.

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Use the Indian equivalent of British Standard 7671.