gene heskett wrote: > Those were SWAG's, pulled out of you know where, Jon. The x taps on that > autoformer we've been putzing with say 370-390 volts at 22 amps, but do not > say total, or per phase, so I chose the worst case scenario or 22 > amps/phase, which in power in kw would be 390*66=25,740 watts, aka 26kw. > Probably, likely wrong. Feel totally free to correct that assumption. KVA > to kilowatts is one conversion that has NEVER made sense to me. > Well, you can't, unless you know the power factor. And, as this thing is a rectifier, the power factor is not linear, either. But, a well-behaved 3-phase rectifier shouldn't have a power factor less than about 80%, so multiplying KW by 1.25 should give a reasonable guess at KVA.
It is insanity to try to run a real 25 KVA machine from a 200 A 240 V single-phase service. Although that service is capable of 48 KVA, the imaginary currents of the machine PLUS the horrible imaginary current of a rotary phase converter will play havoc with the service. If you have your own, private pole transformer (like I am so lucky to have) that helps, but it is still pushing what you are supposed to do. If you are sharing the transformer with neighbors, it could really cause problems. Jon ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
