3 phase power measurement

[danf]

Hi all,

I would like some advice on how to measure Real Power in a 3 phase power distribution system. I believe that the best way to do this is to use the 3 wattmeter method but these meters are quite expensive. Can I buy a single phase wattmeter and measure each leg separately? Then add the phases together? Fluke makes a meter that does this calculation internally but it must be a balanced load. My situation would be unbalanced (a mixture of 3 phase motors and single phase devices)

Thanks for any advice.

Dan

 

[bob]

Re: 3 phase power measurement

Measure the power on each phase and add the values up for total KVA. If you need the kw value then you will need to come up with the power factor. Use the phase to neutral voltage.

[ August 14, 2004, 05:23 PM: Message edited by: bob ]

 

[danf]

Re: 3 phase power measurement

Mark,

Thanks for your response over in the Power Quality forum. In answer to your question, I am not having a power quality problem. I work for an Equipment Manufacturer and I need to provide specs on the load that our equipment draws.

Yokogawa makes a 3-phase data logger that seems to have all the features I'm looking for. For about $2K. I'll do a little more research.

Thanks all for your responses,
Dan