Today topic, Motor horsepower, power factor, How to calculate KVA, KW, currrent and their relation, I will give1 example, for both ghe 1 and 3 phase motor, 1st, we will calculate single phase motor, then for 3 phase motor, this motor is single phase, 230 volt, PF is 0.8, PF should be known, and Hosepower is 10 HP, single phase motor, may not be available for 10 HP rating, sinle phase motor are in small rating, but 10HP is taken just to explain, this motor, is of 7.46 K watts, for KVA calculation, this 7.46 KW, devided by PF 0.8, it comes 9.3 KVA, this 10 HP motor is of 9.3 KVA, this current, flows here, this is watts, here, we have not taken KW, we took watts 7460, if you take KW, then current answer will be in KA, it will zero point some thing, difficult to understand, current comes 40.5 amps, full load current here, will be 40.5 amps, KVAR will be calculated like this, Here I have taken KW, such that, we get answer in KVAR, answer will come 5.6 KVAR, Means, 10 HP motor, having 0.8 power factor, at full load, will draw 40.5 amps current, and 5.6 KVAR reactive power, will flow, here, this 5.6 KVAR is to be removed, we add capacitor to remove this, now if you connect a capacitor, we will connect here, between line and neutral, I will tell precautions also at the end, you must learn that also, see, I connected a capacitor here, calculated value was 5.6KVAR, but I connected only 4.5KVAR capacitor. this is because, that motor power factor will be changing, with load and RPM both, if you connect full size capacitor, and if requirement comes down, then over voltage will be there, so we connect little less KVAR capacitor, Further, this calculation is done in KVAR, I did not told you capacitor micro farad, capacitor for PF correction, are defined in KVAR rating, we do not order in micro farad, for this use, buy micro farad value, is also written on the capacitor, so you need capacitor of 4.5KVAR, 230 volt, 1 phase, Now, I will explain calculation for 3 phase motor, this is 3 phase, 400 volts, this 400 volt, is voltage difference between 2 lines, 400V is not between line and neutral, PF is 0.8, this motor is also of 10HP, here also, calculation is like earlier, KVA will be 9.3 KVA, this calculation is like earlier, but here, calculation for current is different, current will be equal to, power is taken in watts, to get current in amp, IF you take KW, then current will be in KA, difference between single and 3 phase is, here root 3 is used here in 3 phase, voltage is also changed, from 230 volt to 400V, so we get 13.5 amps, so here, in all 3 wires, 13.5 amperes current will flow. KVAR calculation is done like this, we get 5.6 KVAR, this is same as in single phase motor, because load is same, horse power is same, so KVAR also will be same, PF is same, voltage is changed, so current also changed, but power is not changed but fixed, here what will we do?, calculated value is 5.6 KVAR, but we will not take full value, we will take less value, say, we select only 4.5 KVAR capacitor, so 3 capacitors are connected, total is 5.6 ( 4.5 selected)KVAR, sinle phase value will be 1/3 of this. because 4.5KVAR is sued, so 1/3 will be 1.5 KVAR each. so you have to use 3 capacitors, 1.5 KVAR each like this, when you order the capacitor, if you connect capacitor yourself, then supplier will give 3 separate capacitors, or 3 assemblled in single unit, this you have to discuss with supplier, so you have to connect, 3 capacitor of 1.5 KVAR each in delta connection, delta connection will cost less, star connection will may be costly, this is as per my experience in my projects, may be changed now, you must enquire cost for star & delta both, what happens? these capacitor will have a film inside, that is available for 400 volts, if they have to make 230 volt capacitor, then also they have to use 400 volt film, 400V capacitor will be sold as 230 V, so it becomes costly, Precautions, KVAR requirement, changes with load and RPM of motor, so PF will go on changing with fixed capacitor, to avoid this problem, we use automatic power factor controller, over correction will generate over voltage, if you connect fixed capacitor, and if load comes down, so there will be over compensation, and over voltage will be there, so solve this, either you use automatic controller, or, always use less size of capacitor, than calculated value, so over voltage problem will be less, if PF is not know, then measure PF at full load using a PF meter, then calculate KVAR, 5th, delta connection will cost less, star arrangement may be costly, this is as per my experience, 6th is, 7th is, use automatic PF controller, Automatic PF controller, will solve many problems, and PF will be good for differnt load & RPM, other wise PF will go on changing, as PF will change with change in load & RPM, today, we will close now,

## 100 Comments

Sir when you explain all of you first time app hhi teacher ho aap Ka explain mujha samjh aa rahi haa

Sir, your teaching and explanation skill is great. Easy understanding.

Sir can you will concept ampire volt watt, kva, explain

Sir how to calculate power factor

Very informative for new comers

6- During starting, MCB may trip- How to calculate maximum current to select proper size of MCB..

Sir video is very useful Now l have a question that is what we will be demand from supplier mean to say we will perches 1.5or 4.5rating

super sir

Sir muje 20 watt ki synchronous motor ka capacitor konsa lagana hey vo kaise pata kar sakte hey

Nice…..Sir. Thnx.

Sir 3 phase motor ko 2 phase mai kaise chalaye…. Uska connection batayega plissssss…..

Good sir

really so good.

Superb Sir

India.

Sir 10 hp hoga ye kaise pta kre agar likha hua nhi ho ya naya motor khid se bnanaa chahe to

Hello sir

.75 kw =1 hp hoga

Nice explanation thank you so much

Nice explanation thank you so much

bahut achi aal video

Caspater me sar ji rajitens bhi lagana parega

Sir earth leakage relay use & troubleshooting pe video banavo na…

Current calculation me problem he

Very good

Sir capacitor kaham fit karni hai? Motor ke paas aur starter se pahele? Please answer

Sir uppcl तैयारी के बारे में कुछ मार्गदर्शन दे

Very nice vidio

Sir 1kva me kitne watt hote hai

Good

Sir ham kese measure kare …ek 5 kvar capacitor ki current rating

Sir…jab capacitor bank ON hota ha tab Energy metre ma symbol konsa hona sahia ,

Resistive ?

or

Inductive ?

Thanks sir

Lekin single phase main power factor 1 hota Hai

Sir 10 hp ki motors 3 p ki 25 AMP leti hai

https://www.youtube.com/watch?v=WnEIKu7WBkQ

Great video

Good teacher

Sir pf==0.8 kya hota hai… Plz reply sir…

सर आप का बहुत बहुत धन्यवाद

इतनी सरल भाषा मे समझाने के

लिये

Motor ko kw or hp me kyu bolte

Sir love and respect from Pakistan, Very very helpful video

3 phase motor me bhi capacitor lagata h Kya sir,

sir aapne bahut sahi bataya good video

Thanks sir

hello sir please suggest APFC for 10 hp motor aur kitani cost lagegi(lowest cost) . mere yaha jyada tar voltage 400 ke niche rahata hai. electricity cost bad raha hai.

Agarwal Sahab can you enlighten me in the following.

In our town power supply there is 3 phase transformer. What will happen if one H.T line fails.

Will there will be power in the L.T line.

Thank you.

sir kw kesy nikala hay,? please explain me

so beautiful explain sir very nice…

???????????????????????????????????????

2 hp single phase motar kitne kv ki hoti hai n 5 kv ka gantator pe 2 hp ki single phase ki motar chalegi?

Sir Mera single face kvar ka calculation galat aa raha hai

Please ek bar calculation kariye

Automatic power factor 10 ke Bihar ka kitne ka aayega

Power factor original Das ke Bihar ka 3 Page mein kitne ka gadi nalwala

आप बहुत ही अच्छा समझाते हैं

Sir namaste sir ye jaanna he ki alternater 30kva me capacitor lagta he or lagta he to kitna ka. Sir please bataiye ya mobile number aap ka mil sakta he.

Sir

Power factor ko sahi karne ke liye kya karna hoga

this is very good and easy to understand thanks alot

sir aap ki coaching kaha par he bataye me join karna chahta hu

Hello sir plz define the 1-0.8/2 describe in detail

1hp motor 746 watt Main Kaise Apna calculation kiya tha

Thank you so much SIR

ac kw or dc kw me kya fark hota hai

or fark hota hai to 1 ac kw se kitne dc kw nikal sakte hai

7.5Hp motor ke liye kitane kvar Ka capcitar Lagana Hoga batana sir g

Great explanation sir

Meger baremee bataiyyeaa sir

Sir new daata of p f capecitar

clear explanation. Thank you

current ko badha ne par torque badhega ya ghatega

Sir how to discide the kA of components and substation

Si power factor kaya hai

60hp 1440 rpm me kitne kvar Ka capicetior lgana parega uncle

aggarwal ji aap ka video bahut achha laga please spot welding and Arc welding ka power factor correct kaise kare jaroor bataye v.k.gupta 9810235269 [email protected] pls give me your contact no also

230vcapacitor and 440v difference

sir teaching skill is very good .

create a video power factor installation in industrial,all instrument woorking,apfc realy programing.

Sir I love ur videos …….it's a request plzzzz formula ke saath bataiye ……..calculations

One celing fan speed low sow current low or same sir

Kaise calculation kiye zara bataye mera mo 6299019051

KVA kya hai….

सर तीन फेज 7.5 के मोटर पर कितने का कैपिसिटर लगेगा।

Sir number please

What,s app number please

Please Explain how Pf 0.8 got the number

thanks sir very good explain

Very nice explanation sir thank u

THANKS SIR FOR NEW VIDEO I HARTLY THEKNS. NOLES ELECTRIC ENGINEERING.

3hp motor ke liye kitna kva ka generator chahiye

Sir 20hp motor ke bare me bataieye

On load 40amps hai motor ke

Swg 20. 4 delta connection

11pitch 34turn 4 ka set

dubal winding. 48slot

Amps kam karne ke liye kya kare

आदरणीय गुरुजी ?Pf 0.7को 0.99करने के लिए कैसे कैलकुलेट करेंगें।

Sir apna watsaap number dedo

Thanks sir

I salute you sir

Mera kwh

Mera Kwh jyada Raha kvah come a raha hai iska kya Karan hai

Sir bill kisme kam ayaga?

Kvar kaa formula kaise lagaya Please Reply

sorry sir are speaking india or English?

Detail mien btaya karo

Ada bahasa indinesia nya gx pak

Nice

Sir pf lagana zarori hy kya? I plz ans me

You teaching very good. Perfect teaching.,but I don't know hindi, if you make a video in English it will be even better. Thank you.