Answer / abdul rahman

Each unit as in each flat 5kw ?? That would be 250kw for 50 flats.
250kw into 1.8 would be total current = 450amps
Cable sizing Acc to Dubai STDs for 450amps would be 
2runs x 4C 150sq.mm Cu + 1C 150sq.mm ECC 

Transformer sizing u need to take into account 20-25% future use efficiency of t/f and diversity factor

So for 250kw it would be 250x1.2x.8/.9 nearly 300kva transformer.

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

0 Answers  

---

What is the function of auadag in a cro?

0 Answers  

---

3 pahase 750kva Running 2 DG sets in 35 mints.525ampers. and 616 kw how much fuel consumption in Generator.what is the formula.

1 Answers   Delite Systems Engineering,

---

what is the formula for calculating the phase clerance between two phases and phase to earth how to calculate the cable for a motor

0 Answers  

---

if the supply voltage increased by N times, the x-section of conductor will be.........

2 Answers   APGenco, Electrical Tech, Ericsson, IES, Thirumalai Chemicals,

---

why the substation require din electrical system?

1 Answers  

---

how the harmonics are generated in transforemer?

5 Answers   IFFCO,

---

what is the name of the oil is used in transformer?

5 Answers  

---

why we use 50hz frequency in india why not other frequencies like 52,59,42 etc

5 Answers   INTC,

---

How to determine the breaking capacity such as break down current and break down voltage for VCB and CT's.

0 Answers  

---

What is the difference between analogue electronics and digital electronics?

2 Answers   PSU,

---

what is the function of NAT & NAC contacts in breaker control switch (TNC)??

2 Answers  

---