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الرسائل - generator

صفحات: [1] 2
1
There are tow type of battery
                                                          primary cell &secondery cell
                                  primary cell like Children toy, watch

Secondary cell like what we use it in car
   Secondary cell different types put, the most famous are:


1-   lead acid cells
2-   Alkaline cells

2
أسس هندسة كهربائية و الكترونية / hi guys
« في: مايو 16, 2004, 08:36:52 صباحاً »
......... Thank you very much

3
أسس هندسة كهربائية و الكترونية / hi guys
« في: مايو 15, 2004, 10:15:45 مساءاً »
.....  i have problem while i wrote in this site
                           ... which i can't write by different colour
                                    
                who can tell me the way to change the
                                       colour of writeng

4
About transformer Rating:  
 

The capacity of transformers is always given in kVA or MVA, because the heating depends only on the actual current and is not affected by the power factor of that current.

The ratings of most offshore power transformers extend over a range of about 400kVA to
2 500kVA, depending on their duty.  In onshore installations the ratings may go up to 30MVA or more; National Grid sizes may go up to 750MVA.
                                        
 

                                                                                                  

5
:The answer for your question is
        
Because the manufactures don’t know which load you want to feed from transformer. So the put the KVA instead to KW or W

                                                                          
kw=kva+power factor (cos


I will give you the exact equation for KVA ….and KW  in future      days    

                        
   ok

6
أسس هندسة كهربائية و الكترونية / BACK EMF
« في: مايو 11, 2004, 08:19:03 مساءاً »
I’m trainee in Oil Company ……. After few months I will graduate as electrical technician. I have diploma in electrical power technology …….

7
here you are                                                                  
1-Fundamental of electricity published by Shell Company

2-electrical power system protection…..wrote by A.Wright and c. Christopulos

8
Voltage and frequency

I want to now if there is any relation between the frequency and voltage

  In vsd variable speed drive we have to control the speed of pump using the vsd that by changing the frequency

In vsd they use some power electronic devises like……. Thirstier, transistor…..ect  

thanks

9
thank you very much

10
your attachment not open Mr advisor     ......

11
Q.1 – Any body can give me information about electrical submersible pump?   also on how much voltage it run….

                                                                      Moreover, how we can control it  by (VSD) variable speed   drive

12
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 same problem we have in our company.....last week we change the load from 8MVA transformer to 15MVA transformer   because  Consuming demand in summer

13
مشرف التكنولوجيا

I’m happy to be friends and you are welcome.

   I’m from Oman ……really your site is amazing and interesting ……….

      Q.1 – do you have any idea about electrical submersible pump?   And also on how much voltage run….

                               Moreover, about how we can control it by (VSD) variable speed drive

14
وكيف تتم عملية التحكم في خرج التيار هل بواسطة مقاومة متغيرة

ممكن توضيح بالرسومات

15
I mean it senses the speed ,so how it do that
 ':laugh:'

صفحات: [1] 2