kung ganon mali pala yun nag-seminar sa amin King Fahd University of Petroleum and Minerals. Dr. Yasre Ahmed Bin Abdul Aziz Ph.D. Degree in Electrical Engineering (EE) from University of Central Florida
tama po yun bumabalik lang sa system yung reactive power kasi di sya na didissipate dahil useless sya,di sya maaabsorb ng load.umiikot lang sya sa system.
napansin ko lang kasi sa mga power transformer,rating nya lagi nasa apparent power(kVA) saka yung capacitor banks naman nasa reactive power(KVAR) naman yung ratings,baka sa stress may effect yung reactive power kaya importante yung reactive power.
Yup I got the point nung author, regarding sa pagtaas ng current pag bumababa voltage para mamaintain current(item#2).Bakit nyo po nasabi na mali yun?
i can't say that the author doesn't know the subject being discussed.. the author is a "full professor", having a Masters and Ph.D degree from a reputable school and his researches extends from electrical power, transmission line and transients.. and the author is experienced..i wonder why the author didn't mentioned the references.. but i guess, the paper is not a "research paper", on reading his paper.. it's an informal discussion in one particular subject.. however, the author is not citing that the reactive power is not important as "opposed" to the title.. upon my understanding his paper, he's even promoting more on reactive power.. reactive power is one of the important issue for AC phenomena and power calculations for motors, generators and transmission and power lines in measuring the amount of energy going back to the source..
hindi ko maintindihan e, importante ba o hindi importante... Ano ba yong seminar nyo? bat nagkaganon? baka may mga latest technology na dyan na hindi pa namin alam dito sa atin....?share mo naman dito bro
marami-rami rin nakopya ... kunsabagay dami talagang articles sa analog website na highly educatinghttp://www.analog.com/static/imported-files/tech_articles/16242282714726reactive_energy_metering_international_edition.pdf
1) Reactive power is returned to the electric grid as the windings de-energize - generators provide power in kVA. it is composed of true (kW) and reactive (kVAR). if energy is used by a load, (say a motor) no energy is returned to the grid.
2) When reactive power supply lower voltage, as voltage drops current must increase to maintain power supplied, causing system to consume more reactive power and the voltage drops further a constand load motor (for example) will draw more current if the load being supplied to it is lower than its rated voltage. lowering the supplied voltage does not in any way cause a motor to consume more kVAR or kW.
3) If voltage reduction continues, these will cause additional elements to trip, leading further reduction in voltage and loss of the load. power grids reduce voltage in times when demand is greater than the load(supply?). a voltage drop of around 5% is common practice - that is called a "brown out". generators trip when the load is greater than their rated capacity so as to protect their generators from overspeeding.
kung masyadong malaki ang reactive energy, hindi lahat yun ay magagamit ng motor at a certain time, saan kaya pupunta yun?the motor will not consume more energy than it needs. so the VAR supplied by the grid is just ther, waiting to be used. hindi mangyayari na kukuha ng 100 energy si motor tapos isosoli ung 10 na hindi nya nagamit. pag kumuha ng energy si motor, eksakto palagi.Yun na nga yung point ng author master, constant yung kVAR or kW requirement kaya para mamaintain yun sa pagbaba ng Vout eh natural na tataas ang drawn currentmagkaiba ang constant W at constant VAR. wala akong alam na motor na "constant VAR". its always constant W since ito ang equivalent ng work done.Parang pareho po kayo ng sinabi ng author, see the long post above
the motor will not consume more energy than it needs. so the VAR supplied by the grid is just ther, waiting to be used. hindi mangyayari na kukuha ng 100 energy si motor tapos isosoli ung 10 na hindi nya nagamit. pag kumuha ng energy si motor, eksakto palagi.
magkaiba ang constant W at constant VAR. wala akong alam na motor na "constant VAR". its always constant W since ito ang equivalent ng work done.
Almost all power transported or consumed in alternating current (AC) networks. AC systems supply or consume two kind of power: real power and reactive power. (Loads, whether AC or DC, consume energy. Energy in AC loads is composed of 2 components, Watt and VAR).