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Anonymous Poster #1

A Question Releted to Project

02/25/2012 8:55 AM

my question is our project is power factor correction by plc. give me some tips to go further. how to start the project? what it the ratio of c.t. , p.t., that we need? what about our load? please reply as soon as possible.
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wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#2

Re: A Question Releted to Project

02/25/2012 1:33 PM

WOW!!

Lyn you got up early and drank a lot of coffee didn't you.

Like the information.
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lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#3
In reply to #2

Re: A Question Releted to Project

02/25/2012 9:47 PM
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arifkunnath
Commentator

Join Date: Oct 2011
Posts: 95
#4

Re: A Question Releted to Project

02/26/2012 2:20 AM

Lyn , I salute you !!!
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miklokato8
Active Contributor

Join Date: Feb 2012
Posts: 11
#5

Re: A Question Releted to Project

02/27/2012 6:29 AM

goodeve! What type of power factor correction you are planning to do? is it automated or simply fixed? and its only true for systems that has KVA demand load. not applicable for residential consumers. specifically for industrial applications.
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sajani
Participant

Join Date: Feb 2012
Posts: 3
#7
In reply to #5

Re: A Question Releted to Project

02/27/2012 7:23 AM

in our project we have decided to take a three pahse induction motor. our load will vary as per the time. and we are going to use c.t.,p.t., our motor rating is 2h.p. . what should be the rating og c.t. ,p.t., .and how to make zcd(zero crossing detector).
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miklokato8
Active Contributor

Join Date: Feb 2012
Posts: 11
#6

Re: A Question Releted to Project

02/27/2012 6:32 AM

if you are planning for an automated Power factor correction device at simply corrects poor lagging power factor some inductive load(i.e induction motor) , you need to study zero cross detector circuit which will compute for the power factor of your load.
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sajani
Participant

Join Date: Feb 2012
Posts: 3
#8
In reply to #6

Re: A Question Releted to Project

02/27/2012 7:26 AM

ya, we are going to use zcd. our all component is decided but we have big confussion for the rating of component. give me some idea. and also circuit design of zcd.and we will use plc.
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miklokato8
Active Contributor

Join Date: Feb 2012
Posts: 11
#9

Re: A Question Releted to Project

02/27/2012 11:19 PM

From what country are you?
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sajani
Participant

Join Date: Feb 2012
Posts: 3
#11
In reply to #9

Re: A Question Releted to Project

02/28/2012 7:59 AM

india
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miklokato8
Active Contributor

Join Date: Feb 2012
Posts: 11
#10

Re: A Question Releted to Project

02/28/2012 12:46 AM

the project you are making is just for a demonstration, so you are only testing a low HP induction motor which is 2 Hp. so you need to buy CT with a ratio of 1:500 or any CT that can sense the line current of a 2Hp motor. since all CTs has 5A secondary output which is too high .. i recommend that you order CT at RSphilippines.com.. for PT you only need a simple 250mA or 500mA center-tap transformer .. for your capacitor bank, make sure that the ratings of your banks are all the same, for 2HP motor(3Phase) you can use 8 steps for switching banks. meaning 8 banks delta connected oil filled capacitors.. remember that the PF rating of the motor at nameplate is for its full load conditon,
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Users who posted comments:

arifkunnath (1); lyn (2); miklokato8 (4); sajani (3); wareagle (1)

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