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Topic: Power factor


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In the News (Tue 18 Jun 19)

  
  Power Factor Correction technology and Calculations
Power factor is the ratio between the KW and the KVA drawn by an electrical load where the KW is the actual load power and the KVA is the apparent load power.
Power factor correction is achieved by the addition of capacitors in parallel with the connected motor circuits and can be applied at the starter, or applied at the switchboard or distribution panel.
The Power factor of the total current supplied to the distribution board is monitored by a controller which then switches capacitor banks In a fashion to maintain a power factor better than a preset limit.
www.lmphotonics.com /pwrfact.htm   (3549 words)

  
 BC Hydro - Power Smart for Business - Power Factor Correction
Power factor is a measure of how effectively your equipment converts electric current from BC Hydro's system to useful power output, such as heat, light or mechanical motion.
The ratio of your usable power consumption to your reactive power consumption determines your power factor.
By increasing power factor (putting the locomotive in front of the boxcar) capacity is freed up in the electrical system (the chain has more spare tension before reaching the breaking point).
www.bchydro.com /business/investigate/investigate834.html   (701 words)

  
  POWER AND POWER FACTOR IN AN AC CIRCUIT
Power factor is the ratio of true power to apparent power in an AC circuit.
A poor power factor due to an inductive load can be improved by the addition of power factor correction, but, a poor power factor due to a distorted current waveform requires an change in equipment design or expensive harmonic filters to gain an appreciable improvement.
Power factor correction is achieved by the addition of capacitors in parallel with the connected motor circuits and can be applied at the starter, or applied at the switchboard or distribution panel.
www.geocities.com /vijayakumar777/powerfactor/powerfactor.html   (4198 words)

  
 Application Guide - Power Factor Correction Capacitors
Three of the most important factors to consider when choosing a bypass capacitor are its impedance, its dissipation factor, and insulation resistance.
Power Factor Correction is the practice of raising the power factor of an inductive circuit by inserting capacitance.
Power factor correction capacitors must be able to withstand high voltage transients and power line variations without breakdown.
www.electrocube.com /support/bullet3.asp   (760 words)

  
 Power Factor Training
Power factor training is a resistance training system that claims to take the guess work out of training by effectively quantifying muscular intensity and the muscle-stimulating benefits of any workout.
Expectation: I don't expect Power Factor training to be effective because it over simplifies certain biomechanical factors both in the definition of the power indices and in their use in tailoring workouts for maximum effectiveness.
The power index, which is given proportionally less attention in the Power Factor training system, appears to be the developers' attempt to reconcile the fact that power factors decrease as workout length is increased.
dancescientist.com /Documents/PowerFactor.html   (1881 words)

  
 Active PFC (Power Factor Correction)
Power Factor Correction (PFC) allows power distribution to operate at its maximum efficiency.
Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%.
Active Power Factor Correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage.
www.endpcnoise.com /cgi-bin/e/pfc.html   (285 words)

  
 Voltage Regulator Power Conditioner Specification Guide   (Site not responding. Last check: 2007-10-12)
Power conditioners with ratings like 1000% for 1 cycle might not be good choices for industrial or commercial applications with frequent or large inrush current.
With respect to power conditioners, a limitation on load power factor is generally required if the unit will not operate or respond properly if the power factor is too low.
Unless the power factor of the existing or future devices to be protected are well known, it is best to select power conditioners with no (or minimal) load power factor limitations.
www.ustpower.com /Specification_guide.htm   (2222 words)

  
 Power Factor Article
Power factor is one of those subjects about which there seems to be a great deal of confusion and many misconceptions.
The culprit is the the assertion that power factor = cos(Phi), Phi being the phase shift between voltage and current.
Hence, the power factor is 1W/1.414VA = 0.707.
www.microconsultants.com /tips/pwrfact/pfarticl.htm   (1456 words)

  
 Warner Power Termiflex   (Site not responding. Last check: 2007-10-12)
External to the power supply, there is usually a process controller that compares a feedback signal, most often temperature of the load, to a set point and then provides a command signal to the switch control in the power supply.
However, at reduced power when the SCR's are phased back and only conducting part of the sine wave the power factor is poor and comparable to that of saturable magnetic control.
As power level requirements are increased the microprocessor control transfers from Phase Angle Control to Time Proportioning Control, similar to a contactor, so that only full sine waves are passed to the load thereby operating at near unity power factor, reference Fig.
www.warnerpower.com /technical/powerfactor1/power_supply_development.html   (1384 words)

  
 PFC decoded
Power factor correction (PFC) is, essentially, what you do to complex AC loads (such as PC switchmode power supplies) to make them act more like simple loads (such as toasters).
Power equals VA times power factor, and power factor is the cosine of the phase angle between voltage and current.
It sucks power from the mains in a resistive way, and feeds it to the low power factor circuit on the other side, isolating the mains from whatever that circuit is doing.
www.dansdata.com /gz028.htm   (1678 words)

  
 A Primer on Power Factor Correction
Power factor is the proportion of active power (p) to apparent power (s), as shown in this power triangle.
So power factor is the proportion of power converted into useful work to the total power consumed by the loads or delivered by the power source.
This graph of the release of the power system in per-unit of active power in a facility demonstrates that you get the maximum release in those cases where the existing power factor is low and the target power factor is high, such as near or equal to one.
ecmweb.com /mag/electric_primer_power_factor/index.html   (2621 words)

  
 Delta-Q Technologies > Technology > Power Factor Correction
Power factor correction (PFC) is a technique of counteracting the undesirable effects of electric loads that create a power factor that is less than 1 (or unity).
Power Factor is a term of measure for how well a power load uses the power, and is defined as the ratio of real power to apparent power.
The importance of near-unity power factor, and the value of Power Factor Correction, is discussed in the Delta-Q White Paper titled “QuiQ - High-Efficiency Grid-Friendly Battery Charger.” These effects have been recognized in Europe for many years, and regulators have made high power factor mandatory for electrical equipment.
www.delta-q.com /technology/power-factor-correction.shtml   (196 words)

  
 "What is Power Factor?
Power factor is the ratio between the KW (Kilo-Watts) and the KVA (Kilo-Volt Amperes) drawn by an electrical load where the KW is the actual load power and the KVA is the apparent load power.
Ideally, the power factor should be as close to unity (Power factor of "1") as possible.
Capacitive Power factor correction connected to a supply caus es resonance between the supply and the capacitors.
www.tvss.net /pq/pf.htm   (2742 words)

  
 APPLICATION HANDBOOK FOR THE RELATIONSHIP BETWEEN REAL POWER, APPARENT POWER AND POWER FACTOR by KEPCO, INC.
Real power is mathematically determined by dividing time into a very large number of small segments and multiplying the instantaneous voltage present in each time segment by the instantaneous current flowing and averaging the results.
Since power factor represents the ratio of real to apparent power, the high apparent power that yields a low power factor translates into a higher current than the load actually needs to satisfy its real power requirement.
Power supplies with active power factor correction (PFC) include the Kepco ABC (100W), MST (200W), RCW (350, 750 and 1500W), RKW (50, 100, 150, 300, 600 and 1500W), HSP (1000 and 1500W), BOP High Power (1000 and 2000W) and HSM (1000 and 1500W).
www.kepcopower.com /hbkpfc.htm   (1897 words)

  
 Power Factor Correction Concepts
Power factor is the ratio of Active Power (W) to the Apparent Power (VA) (Figure 1).
However, in practice, the power factor is improved to fall between 0.9 and 0.95.
The leading power factor on the first ballast, in conjunction with the lagging power factor of the second ballast, brings the total power factor to near unity.
www.ambercaps.com /lighting/power_factor_correction_concepts.htm   (684 words)

  
 How to Measure Power Factor
Power factor is defined by IEEE and IEC as the ratio of true power to apparent power: PF = W/VA. Power factor takes into account both the phase and wave-shape contributions to the difference between true and apparent power.
Secondly, the current waveform distortion that contributes to reduced power factor is a cause of voltage waveform distortion and overheating in the neutral cables of three-phase systems.
Even when a power factor-corrected power supply is used and the power factor is close to 1, the amplitude of a high-order harmonic could exceed the limits.
www.evaluationengineering.com /archive/articles/0903power.htm   (862 words)

  
 Furman Power Factor PRO | Sweetwater.com
When the AC power factor is poor, amplifiers sound muddy because their power supplies can't deliver when pushed.
The Power Factor PRO has a generous 12 amp R.M.S. capacity, a convenient 20 segment AC voltmeter, a detachable, locking AC cord, and (4) AC outlets, all contained in a small convenient, floor standing package.
Power Factor PRO E: "E" suffix versions are for use in countries with 220/240 volt AC lines.
www.sweetwater.com /store/detail/PFPro   (589 words)

  
 Lessons In Electric Circuits -- Volume II (AC) - Chapter 11
Because true power and apparent power form the adjacent and hypotenuse sides of a right triangle, respectively, the power factor ratio is also equal to the cosine of that phase angle.
Power factor can be an important aspect to consider in an AC circuit, because any power factor less than 1 means that the circuit's wiring has to carry more current than what would be necessary with zero reactance in the circuit to deliver the same amount of (true) power to the resistive load.
Poor power factor in an AC circuit may be “corrected”, or re-established at a value close to 1, by adding a parallel reactance opposite the effect of the load's reactance.
www.ibiblio.org /obp/electricCircuits/AC/AC_11.html   (3514 words)

  
 Blackout 2003 - The Power Factor
Initially, a fire at a New York City power plant was the cause.
In effect, NERC is the clearinghouse for financial transactions involving the nation's power generators and transmission line operators.
So much power is being imported into the region that the transmission infrastructure is inadequate to handle the load.
www.quarterly-report.com /energy/blackout_2003.html   (786 words)

  
 Power Factor Correction
Utility rate structures that account for reactive power consumption, by either a KVA or var demand usage, or a power factor penalty are the ones that can provide this pay-back.
The reactive power, or magnetizing power, (represented by the vertical leg of the upper or lower triangle) is the power required to produce the magnetic fields to enable the real work to be done.
The ratio of the real power to the total power in the equation above (or the cos of phi) is called power factor.
www.nepsi.com /powerfactor.htm   (984 words)

  
 What is power factor?
 Power factor is the ratio of true power or watts to apparent power or volt amps.
Thus power factors of 0.8 are the same as 80 percent.
Power Factor Correction Capacitors are normally used to try to correct this problem.
members.tripod.com /~masterslic/FAQ-2/22.html   (374 words)

  
 Bodybuilding.com - George Chen - Does Power Factor Training Work?
For example, to increase their power factor, they can attempt to lift more total weight in the same period of time or the same amount of weight in a shorter period of time.
Therefore, the external power generated in a compound exercise should not be compared to that generated in an isolation exercise in which the power is derived primarily from a single muscle group.
The power index, which is given proportionally less attention in the Power Factor training system, appears to be the developers' attempt to reconcile the fact that power factors decrease as workout length is increased.
bodybuilding.com /fun/powerfactor.htm   (2545 words)

  
 Power Factor power quality
Power factor is an indicator of the health or efficiency of your power distribution system.
Certainly this entire publication could be devoted to power factor, but we will attempt to briefly highlight the key elements, how it impacts your operation and utility cost and offer some general solutions.
Power factor is an indicator of how much of a facility power system’s capacity is available for productive work.
www.energyconsultants.org /power_factor.htm   (557 words)

  
 Power Factor Meter
A power factor meter is a type of electrodynamometer movement when it is made with two movable coils set at right angles to each other.
These coils are connected with their series resistors from Phase B to Phase A and from Phase B to Phase C. At a power factor of unity, one potential coil current leads and one lags the current in Phase B by 30°; thus, the coils are balanced in the position shown in Figure 14.
A change in power factor will cause the current of one potential coil to become more in phase and the other potential coil to be more out of phase with the current in Phase B, so that the moving element and pointer take a new position of balance to show the new power factor.
www.electricianeducation.com /electrical/power_factor_meter.htm   (3100 words)

  
 Power Factor Correction
Wasted energy capacity, also known as poor power factor, is often overlooked.
Power factor charges may range from $5 to thousands of dollars per month.
Benefits of increasing a low power factor include eliminated or reduced power factor charges on utility bills, more efficient operations with increased capacity and reduced amperage draw.
www.alliantenergy.com /docs/groups/public/documents/pub/p012478.hcsp   (306 words)

  
 Power Factor for AC Power   (Site not responding. Last check: 2007-10-12)
For a DC circuit the power is P=VI, and this relationship also holds for the instantaneous power in an AC circuit.
A power factor of one or "unity power factor" is the goal of any electric utility company since if the power factor is less than one, they have to supply more current to the user for a given amount of power use.
Industrial facilities tend to have a "lagging power factor", where the current lags the voltage (like an inductor).
hyperphysics.phy-astr.gsu.edu /hbase/electric/powfac.html   (255 words)

  
 Power Management DesignLine | How power modules address unique appliance requirements
Power Factor Correction (PFC), EMI and thermal resistance are important considerations in applications that have to meet international standards for efficiency.
Harmonic current that is generated by a non-linear load deteriorates the power quality of a utility, and is a source of electrical interference for equipment that is connected to the point of common coupling.
Air conditioners, whose power ratings range from 1 to 4 kW, are classified as Class A equipment according to IEC61000-3-2 (input current is less than 16 Arms), and most of these air conditioners are adopting power factor correction (PFC) circuits as the pre-regulator to mitigate harmonic distortion.
www.powermanagementdesignline.com /168601439   (1118 words)

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