[admin]

Cable selection is based on the load current to enable the core of the cable to conduct that much current & also the selction / size of the conductor / material of the conductor (Cu/ Al ) depent on laod current.To do it proffecionally you must know the starting current,the length of wires,ambient temp. …

Cable size selection chart

[admin]

Considerd A transformer without KVA rating ,initially I w

[admin]

dear shah.

                    the question u asked is not clear to you. bcos you dont know that why sony tv and other electrical or electronic equipment can run on 110 as well as 220v. bcos there is a transformer inside tv which have the winding according to the voltage and u have an option to use any one of them. hope the answer of the question

[admin]

Hi,

I believe it depends on the raw materials available in your area but it think GAS/THERMAL  is the best means. 

[admin]

Here are a couple of books I used getting my EE degree:

 

Electrical Circuits by Nilsson and Riedel (Circuit Theory I and II)

Fundamentals of Applied Electromagnetcs by Ulaby (EMF)

There was also a circuits and signals book that I cannot remember the author of though

[admin]

amit kulkarni said:

hi can u help me @ transformer (3 phase) losses any formulae or thumb rules.if the transformer is 50 % loaded there are some losses but how to calculate? how we to calculate % of transformer loading?

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WE HAVE TWO TYPES OF LOSSES IN TRANSFORMER…..ie….iron loss and copper loss…one which will be constant for every loads…and the one which vary with bthe loading conditions respectively…..iron loss occurs all the time whether the transformer is loaded or unloaded and hence also called constant loss…and the other occurs only when it is loaded…and vary with the loads..and hence also called variable loss….an open circuit test in which rated voltage is applied to the primary winding and secondary winding is open circuited(test will be carried out in the low voltage side)is used for determining ironloss…..here the wattmeter gives the iron loss…bcos copper loss at no load conduction is negligible…..and the copper loss could be datemined by short circuit test in which rated current is made to flow through the primary winding and secondary winding will be short circuited….here the wattmeter reading gives full load copper loss…and to determine copper loss at  x(FULL LOAD) the below formula can be used…
 

     W(cu,xfl)=X*X*W(cu,fl)    where W(cu,fl) is the full load copper loss……                                                                                                              and the total transformer loss will be iron loss+copper loss

[admin]

Greetings!

I would like also to avail of the drawings/diagrams of energy meters, ct & pt rated.

I appreciate it very much if you could send me a copy.

Thank you. God Bless!

[admin]

you can check Metrum produced according ti IEC 61000-4-30 where you can monitor consumption and other aspects. Actually it is most helpful in indsutrial installation. Other wise a net analysis mostly under normal operation is essential sometimes particulary to determine THD, PF, transients etc.  

[admin]

Hi

You can download “IEEE-519-1992”  standard about THD, it's a good referenace.

[admin]

Thanks, if its exceeds the maximum value of 5 % for n=3 and 6 % for n=5, what will be the impact in the connected instrument or devices, does it will damage the instrument?what precaution or protection we can apply.

[admin]

Dear Friend,

 

 In our plant we have load of 750kw  we are using 400kvar capacitor bank ….we are getting 0.91-0.97 pf sum tymes we are getting less pf like o.87….why getting like this>is capacitor bank has to increase ?

[admin]

The capacity of generator must be the peak load current multiplied by its power factor and operating voltage then multiplied by square root of 3..The unit is watts.

[admin]

Pls,  can you give me the same manual thank you and more power

[admin]

I have been trying to get the load shedding guide but the “system” states I am registered already. How can I get a copy?

[admin]

i want to calcute my home electricity load and also want to know illuminus calclations formuly any bdy hlp me plz?

[Author]

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