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Re: Re: Re: Re: Re: another look at volts, amps an
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Posted by buickanddeere on January 23, 2004 at 11:57:46 from (192.75.48.2):
In Reply to: Re: Re: Re: Re: another look at volts, amps and wa posted by Steveormary on January 23, 2004 at 10:10:11:
A motor drawing 50.0amps on an ammeter may have 30.0 amps of reactive current lagging 90 degrees out of phase behind the applied voltage and 40.0 amps of current in phase with the applied voltage doing work.
If I remeber correctly that's a lousy P.F. of .75 and a lagging angle of 41.4 degrees.
By adding powerfactor correction capacitors drawing 30.00 amps of current leading the applied voltage by 90 degrees. The motor's measured current will now be 40.0 amps. Saving 30.0amp coming from the utility generator to the motor and back. And the conductors now can be sized for 40.0amp. Only thing that reactive/capacitive current does is cause I squared R losses and require larger conductors. Now the current will just circulate between the motor and capacitor. The utility will just see the motors work load and minor losses.
I realize the number don't appear to add up but we are looking at angles rather than straight lines.
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