Is Unity power factor a good thing?
2006-08-08 10:29:27 · 5 answers · asked by goring 6 in Science & Mathematics ➔ Engineering
isnt the power factor = 1 when Xsub L equals XsubC?
2006-08-08 12:33:57 · update #1
Isnt if a fact that Inductance and capacitance in any system cannot be avoided?
2006-08-09 00:27:50 · update #2
its an ideal condition for them it means no reactive power.all the active power goes to the lines .and the magnitude of current is less than other situations.power engineers to all they can to achieve this goal like shunting capacitors with motors and ....
2006-08-08 17:30:30 · answer #1 · answered by nima_iran_1985 3 · 0⤊ 0⤋
With a power factor of 1, the voltage and current are in phase.
This means that for a given current there is maximum power transfer to the load. To maintain the same power transfer to the load with a power factor of less than 1, the current must be increased. Losses in transmission are ohmic losses, the higher the current the higher the losses. This means that the transmission losses are at a minimum with a power factor of 1 and the system is at it's most efficient.
Unity power factor is a good thing. Power factor correction is applied to various devices such as motors and switch mode power supplies to get as close to unity as is practicable.
2006-08-08 12:26:38 · answer #2 · answered by Stewart H 4 · 0⤊ 0⤋
The power factor is usually .9 to .99. When a generator is being prepared to come on line (sync with the grid) the voltage adjustment is used to match grid voltage. The speed of the generator is adjusted to get 60Hz. When voltage and frequency are matched (the frequency just a tic fast) the generator breaker must be closed at 11:55 on the gauge. Once the generator is online the grid will actually pull the voltage around a little (with it the power factor). So what it happens is... it does approach one sometimes and the system voltage increases slightly and sometimes it goes more to .9 and the voltage decreases.
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2006-08-08 13:36:15 · answer #3 · answered by JFC I No 3 · 0⤊ 0⤋
The power plants would be able to supply less current. Less current means less I-squared-R losses. So you would be able to use a little less fuel if you did not have this heat loss in the conductors. You also might be able to use smaller diameter conductors because of less current.
2006-08-08 10:37:13 · answer #4 · answered by Mai Tai Mike 3 · 0⤊ 0⤋
Absolutely-unity PF is ideal, and you save on electricity bills!
2006-08-08 12:28:57 · answer #5 · answered by logikal 2 · 0⤊ 0⤋