Motor power factor correction

[Knobhead]

Motor power factor correction
I’ve been playing around in Excel again. If any one wants a copy of this sheet send me a PM. I’ll also send the updated FLC sheet as well.
A quick note about the PF sheet, for multiple motors you’ll have to decide when during the start up of a group of drives the group PF kicks in. it’s not good practice for it to come in on initial start up.

 

[malcolmsanford]

Tony would be great if you could send a copy as that would be really useful. Do you want my email addy

 

[Guest123]

Thread stuck

& you have PM.

 

[Knobhead]

Just as an aside, years ago I’d installed 2 new MCC panels. Got a phone call from the site engineer “there’s a couple of parcels for you in the loading bay”. Intrigued I went to collect them, 2 oil filled 50 & 60 KVAR capacitors that looked like Noah had forgotten to put them on the ark. So they got cobbled in to the system.
Later I asked him how he calculated the rating, “I didn’t, I found them in the back of the stores”. I’ve just used the spreadsheet, he was 2% out!

 

[snaban]

Can somebody give sizes of capacitors needed for PFC and starting of 3phase induction motors of various sizes(kw/rpm/design code).At least give a link.

 

[Knobhead]

Can somebody give sizes of capacitors needed for PFC and starting of 3phase induction motors of various sizes(kw/rpm/design code).At least give a link.

PM me!

 

[snaban]

Thanks Tony.I don't know your email address

 

[Knobhead]

Use the boards Personal Messaging service, that’s what PM means!

 

[gerard]

Tony - can you PM the PFC spreadsheet please?

 

[Knobhead]

PM your e-mail address.

 

[windtech]

Tony can you pm me a copy to plse tks

 

[Adaham]

Hi


Can somebody help me , I've finish my L2 electrical intallation , and and in June i'll finish L3 , I just got pass 17edit 2008 new amendement (2011), plus , I've just started an evening 2391 T&I course (will finish in 8weeks time ) ,

I want to do my NVQ , can you help ?

Best Reguards

 

[Knobhead]

What in the name of god has that got to do with motor PFC?

 

[Adaham]

I'm sorry i want to post about NVQ , was a mispost

 

[steve50]

Thank you Tony

 

[John Blaze]

Just sent you a PM requesting a copy

Cheers

 

[gerard]

I cant find it I'm afraid, I know I got it somewhere. Put a post up looking for it and you will have it in no time.

 

[Knobhead]

I cant find it I'm afraid, I know I got it somewhere. Put a post up looking for it and you will have it in no time.

Have what in no time?

 

[Knobhead]

Just sent you a PM requesting a copy

Cheers

Sent, don't forget the thanks button.

 

[aprillove1719]

sometimes Excel makes me crazy also... heheheh its complicated to use....

 

[snaban]

As the no load current varies from manufacturer to manufacturer the size of capacitor for any motor(kw/speed/design code etc)should be obtained from the manufacturer. Some capacitor manufacturers too give a chart/table to select proper rating of capacitor. I don't know whether there is a code/regulation(BS/IEC/NEC/VDE/NEMA etc) on this matter.

 

[lemau]

Hi...i think calculation for power factor correction for motor is easy to understand if we follow step by step..last year i completed install power factor capacitor for my air-compressor motor to reduce FLA..I used simple power factor calculation for electric motor from this post : sizing for capacitor power factor & power factor capacitor installation

 

[snaban]

PM your e-mail address.

Tony please mail to [email protected]