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Hp to KW, Capacitor KVAR size calculation for motor, Hindi

December 14, 2019


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,

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100 Comments

  • Reply a.saisirisha Bhanu October 31, 2018 at 12:09 pm

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

  • Reply Nilesh Jadhav February 4, 2019 at 6:48 am

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

  • Reply PRAKASH SAHU February 6, 2019 at 8:53 am

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

  • Reply sanket more February 6, 2019 at 4:22 pm

    Sir how to calculate power factor

  • Reply Kaushlendra Singh February 8, 2019 at 5:30 pm

    Very informative for new comers

  • Reply M Alam February 11, 2019 at 8:54 pm

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

  • Reply mohan ji February 14, 2019 at 5:08 pm

    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

  • Reply Munish Munish February 15, 2019 at 6:59 am

    super sir

  • Reply sanjay koladiya February 16, 2019 at 12:22 pm

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

  • Reply Dilip Das February 16, 2019 at 6:48 pm

    Nice…..Sir. Thnx.

  • Reply patel pinkesh February 17, 2019 at 1:45 pm

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

  • Reply Electrical Engineering February 22, 2019 at 8:22 pm

    Good sir

  • Reply KINGKAR MANDAL February 27, 2019 at 7:08 am

    really so good.

  • Reply Suraj Ghadge March 1, 2019 at 2:50 pm

    Superb Sir

  • Reply Nikola Romanos March 3, 2019 at 4:24 pm

    India.

  • Reply rakesh mahli March 9, 2019 at 4:21 pm

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

  • Reply Prabhu kumar March 13, 2019 at 4:09 pm

    Hello sir

  • Reply asad jamal March 13, 2019 at 4:55 pm

    .75 kw =1 hp hoga

  • Reply Ammu 3877 March 13, 2019 at 6:11 pm

    Nice explanation thank you so much

  • Reply Ammu 3877 March 13, 2019 at 6:11 pm

    Nice explanation thank you so much

  • Reply RAVI KUMAR March 14, 2019 at 12:14 pm

    bahut achi aal video

  • Reply Chandan Kumar Yadav March 14, 2019 at 4:20 pm

    Caspater me sar ji rajitens bhi lagana parega

  • Reply Ravindra Jadhav March 15, 2019 at 4:10 am

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

  • Reply technical support solanki March 15, 2019 at 5:12 am

    Current calculation me problem he

  • Reply Ajit Kumar Singh March 16, 2019 at 3:41 pm

    Very good

  • Reply Gururaj Kamath March 17, 2019 at 9:51 am

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

  • Reply Kamal Nath March 25, 2019 at 11:31 am

    Sir uppcl तैयारी के बारे में कुछ मार्गदर्शन दे

  • Reply daud hasan March 31, 2019 at 5:29 am

    Very nice vidio

  • Reply daud hasan March 31, 2019 at 5:32 am

    Sir 1kva me kitne watt hote hai

  • Reply Gagan Verma March 31, 2019 at 7:47 am

    Good

  • Reply JEHIRUL ISLAM March 31, 2019 at 8:18 pm

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

  • Reply JEHIRUL ISLAM March 31, 2019 at 8:21 pm

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

  • Reply pravin shakya April 4, 2019 at 12:56 pm

    Thanks sir

  • Reply Aftab Ch April 7, 2019 at 7:02 am

    Lekin single phase main power factor 1 hota Hai

  • Reply Rajeshsharma346 April 10, 2019 at 3:44 am

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

  • Reply G K Agrawal April 16, 2019 at 4:36 am

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

  • Reply Mohit kumar April 18, 2019 at 1:52 pm

    Great video
    Good teacher

  • Reply Sujoy Roy April 21, 2019 at 9:57 am

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

  • Reply vikas sharma May 3, 2019 at 2:02 pm

    सर आप का बहुत बहुत धन्यवाद
    इतनी सरल भाषा मे समझाने के
    लिये

  • Reply Vikash Kumar May 4, 2019 at 5:58 pm

    Motor ko kw or hp me kyu bolte

  • Reply TOP 10ZZ May 5, 2019 at 6:46 am

    Sir love and respect from Pakistan, Very very helpful video

  • Reply Azmat Ali May 14, 2019 at 5:02 am

    3 phase motor me bhi capacitor lagata h Kya sir,

  • Reply Bhupendra Singh May 15, 2019 at 6:14 am

    sir aapne bahut sahi bataya good video

  • Reply Sk Paglu May 16, 2019 at 11:59 pm

    Thanks sir

  • Reply shailendra kumar May 23, 2019 at 2:26 am

    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.

  • Reply Sundararajan Ramachandran May 25, 2019 at 3:20 pm

    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.

  • Reply pappu yar tang na kar May 27, 2019 at 4:04 am

    sir kw kesy nikala hay,? please explain me

  • Reply pravin patil June 3, 2019 at 8:38 am

    so beautiful explain sir very nice…

  • Reply pravin patil June 3, 2019 at 8:46 am

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

  • Reply Sohel Moyawala June 13, 2019 at 5:38 am

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

  • Reply Santu Ji June 13, 2019 at 6:31 pm

    Sir Mera single face kvar ka calculation galat aa raha hai
    Please ek bar calculation kariye

  • Reply Dinesh Shingh June 17, 2019 at 10:27 am

    Automatic power factor 10 ke Bihar ka kitne ka aayega

  • Reply Dinesh Shingh June 17, 2019 at 10:28 am

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

  • Reply Ramesh Kumar Nishad June 24, 2019 at 3:16 am

    आप बहुत ही अच्छा समझाते हैं

  • Reply suraj Gupta June 24, 2019 at 12:42 pm

    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.

  • Reply lalit kumar June 25, 2019 at 9:17 am

    Sir
    Power factor ko sahi karne ke liye kya karna hoga

  • Reply eman bahaa July 1, 2019 at 2:57 am

    this is very good and easy to understand thanks alot

  • Reply Ajay Vishwakarma July 2, 2019 at 12:38 pm

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

  • Reply Sandeep Kumar July 4, 2019 at 11:29 am

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

  • Reply Pintoo Mishra Pintoo Mishra July 7, 2019 at 11:50 am

    1hp motor 746 watt Main Kaise Apna calculation kiya tha

  • Reply vikram barot July 11, 2019 at 6:54 am

    Thank you so much SIR

  • Reply Arpit Thakur July 11, 2019 at 8:09 am

    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

  • Reply rajoriyadk July 15, 2019 at 3:11 am

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

  • Reply Azhar uddin July 16, 2019 at 8:10 am

    Great explanation sir

  • Reply Sambua Nayak July 17, 2019 at 5:30 pm

    Meger baremee bataiyyeaa sir

  • Reply Ashok Raipure July 20, 2019 at 5:01 pm

    Sir new daata of p f capecitar

  • Reply arivu azhagan July 24, 2019 at 2:19 pm

    clear explanation. Thank you

  • Reply Abhijeet verma July 25, 2019 at 4:21 am

    current ko badha ne par torque badhega ya ghatega

  • Reply Mohammed Saifulla H July 26, 2019 at 1:31 am

    Sir how to discide the kA of components and substation

  • Reply Sikendar Singh July 28, 2019 at 2:42 am

    Si power factor kaya hai

  • Reply Shivam agro industry July 29, 2019 at 12:12 pm

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

  • Reply vinod gupta August 1, 2019 at 7:44 am

    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

  • Reply Shaik I Rehaman August 2, 2019 at 5:41 pm

    230vcapacitor and 440v difference

  • Reply uv kumiya August 8, 2019 at 11:57 pm

    sir teaching skill is very good .
    create a video power factor installation in industrial,all instrument woorking,apfc realy programing.

  • Reply Amit Prasad August 10, 2019 at 4:08 pm

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

  • Reply Prankrishna Santra August 17, 2019 at 5:03 am

    One celing fan speed low sow current low or same sir

  • Reply Praveen Samrat August 17, 2019 at 4:09 pm

    Kaise calculation kiye zara bataye mera mo 6299019051

  • Reply Sujoy Roy August 27, 2019 at 1:46 am

    KVA kya hai….

  • Reply Pradeep Sharma September 1, 2019 at 3:49 am

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

  • Reply Bipan kumar Rana September 1, 2019 at 10:13 am

    Sir number please
    What,s app number please

  • Reply அறபி வம்சம் அறபிவம்சம் September 2, 2019 at 9:26 am

    Please Explain how Pf 0.8 got the number

  • Reply sanjay singh bisht bisht September 2, 2019 at 12:24 pm

    thanks sir very good explain

  • Reply abu baker September 4, 2019 at 7:02 am

    Very nice explanation sir thank u

  • Reply gohil Tiger September 5, 2019 at 5:10 pm

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

  • Reply jitu Gop September 9, 2019 at 9:38 am

    3hp motor ke liye kitna kva ka generator chahiye

  • Reply Talib Talib September 12, 2019 at 8:40 am

    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

  • Reply Sanjeev Rai September 13, 2019 at 4:13 am

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

  • Reply Istikhar Ahmad September 17, 2019 at 3:27 am

    Sir apna watsaap number dedo

  • Reply Gautam Kumar September 18, 2019 at 4:34 pm

    Thanks sir

  • Reply Amit Kumar September 22, 2019 at 2:49 pm

    I salute you sir

  • Reply Sanjay Singh September 24, 2019 at 11:12 am

    Mera kwh

  • Reply Sanjay Singh September 24, 2019 at 11:13 am

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

  • Reply Mamuni Sahoo September 26, 2019 at 12:27 pm

    Sir bill kisme kam ayaga?

  • Reply raj vaghadiya October 11, 2019 at 7:06 pm

    Kvar kaa formula kaise lagaya Please Reply

  • Reply Sarith Heang October 20, 2019 at 3:58 am

    sorry sir are speaking india or English?

  • Reply Rehan Rahmani October 31, 2019 at 1:41 am

    Detail mien btaya karo

  • Reply Dodi Hermawan November 4, 2019 at 10:04 pm

    Ada bahasa indinesia nya gx pak

  • Reply nagendra 8051444452 Kumar November 8, 2019 at 7:22 am

    Nice

  • Reply Muhammad Azeem November 18, 2019 at 1:11 pm

    Sir pf lagana zarori hy kya? I plz ans me

  • Reply LISTEN Arun December 13, 2019 at 3:05 pm

    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.

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