Answer / 7anoter4

1)If this is only 1 capacitor and this is the voltage
between capacitor terminals:

Cap=10^9*Q/(Voltage^2*2*pi*frequency) if Q is in kVAR and
capacity in microFarad.

pi=3.14159

Cap=10^9*12.5/(440^2*2*pi*50)=205.5 mF

2)If this is reactive power of 3 capacitors in Y connection:

Voltage at a single capacitor terminals will be 440/sqrt(3)
=440/1.73=254 V

Reactive power of a single capacitor will be 12.5/3=4.167
kVAR

Then the capacity of a single capacitor will be :

Cap=10^9*4.167/(254^2*2*pi*50)=205.5 mF

3)If this is reactive power of 3 capacitors in Delta
[Triangle] connection:

Voltage at a single capacitor terminals will be 440 V

Then the capacity of a single capacitor will be :

Cap=10^9*4.167/(440^2*2*pi*50)=68.5 mF

If Q=25 kVAR Voltage=440 V then the capacity of a single
capacitor will be :

single and Y=411 microF ; Delta=137

If Q=12.5 kVAR Voltage=690 V then the capacity of a single
capacitor will be :

single and Y= 83.6 microF ; Delta=27.85

If Q=25 kVAR Voltage=690 V then the capacity of a single
capacitor will be :

single and Y= 167 microF ; Delta=55.7 microF

what are the limitations to use 33kv ac in industries?

0 Answers  

---

why high speed tripping relay will be used in tripping circuit why not normal relay

0 Answers  

---

What is the function of Buchholz relay in transformer ?

1 Answers  

---

why America use 60HZ 110V?

4 Answers   Kalindee Rail,

---

why transmission line towers are longer than communication line towers?

3 Answers  

---

how to find the resistance

3 Answers   Saint Gobain,

---

how calculate kva in to kw

1 Answers  

---

Either the Armoured Earthing strip of HT 3 core cable have to pass through CB CT or not , why ???

0 Answers  

---

what happens when we give ac supply to the dc motor?and why?

4 Answers  

---

what is the difference between DOL starter&star-delta starter& automatic star-delta starter

2 Answers   Dalkia, GSK,

---

How to calculat size of copper & aluminium ?

6 Answers  

---

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

0 Answers  

---