Answer / me

Greetings all,

iam working in an out door lighting design for our plant
and i calculated the total watt needed (sum of all lights)
= 53 kw, 220 volt

our power supply is 480V

so, I chosed a 75 KVA transformer dry type 480/220-127 V 3
phase 60 Hz

cable size from feeder to transformer primary = 50 mm2 (1/0
AWG)

cable size from transformer secondary to distribution panel
board = 125 mm2 (250 MCM)

distribution panel board main breacker = 250 A

So, are my calculations ok ? any changes or suggestions ?

thanks in advance

WHAT IS THE MEANING OF 'UPF'&'LPF'.... HOW CAN WE DEFINE IT? WHAT IS THE VALUE/RANGE OF EARTH WIRE RESISTANCE USED PARTICULARLY IN HOME....

2 Answers  

---

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............

0 Answers  

---

what is the most probable reason of failure of current transformer?

2 Answers   L&T,

---

what are the names of oil used in transformer and its chemical name?

11 Answers   Bhel, CSEB,

---

What is SF6 Circuit Breaker?

2 Answers   Amdocs,

---

what's float charger and boost charger? why it's used?

2 Answers   APCPDCL, PTCL, Rolls Royce, Siemens,

---

What are the maximum and minimum ratings of MCB,MCCB,ACB,OCB,VCB and SF6 breakers?

2 Answers   ABB, SK E&C, Sodexo,

---

What happen if an alternator rotates in reverse direction?

3 Answers  

---

how to calculate busbar size? if ex:1000amps i need to calculate busbar size and what size of bar?if any example caculation pls give the formulas.

2 Answers  

---

what is the need of reactor in between the transmission line?..like powergrid like that..

5 Answers   Delta Roto Tech,

---

how to reduce earth resistance in sandy soil.

1 Answers  

---

what is differnce between grounding and earthing or both are same?

3 Answers  

---