Answer / a.narasimha rao

Transformer capacity is 250 KVA

Primary current = 250000/1.732x11000= 13.12 Amps

Short circuit current ( 6 times primary current )

total current would comes -----90 amps

Size of the cable --- 3c X 35/ 50 sq.mm 11 kv HT XLPE
cable is required for primary

Secondary side current -----333.35 amps

cable size is 3.5 c X 300 sq.mm AYFY cable is required

Answer / pillay

IS it a 250 KVA or 2500 KVA transformer? any way you must
know the operating current first before determining the
cable size. if 250 kva than 250000 / 11000 / 1,732 = 13.12
amps the cable should be able to withstand 11000 volts and
carry 13.12 amps.

If OLTC is in manual position there is chance to variation of voltage(Low or High)?

1 Answers   Juniper Networks,

---

What is purpose of APFC panel?

7 Answers   Techno Electric and Engineering,

---

when the control mechanism is present for an ammeter(1-10A) and 1A current is apllied what will be the reading of the meter?

2 Answers   GATE,

---

show that power dissipated by a pure inductor exited by a sinusoidal voltage source v = vm sin wt is zero

1 Answers  

---

Why slip-ring and brushes are not required in squirrel cage induction motor?

4 Answers   L&T,

---

What is bandpass of a transformer?

2 Answers  

---

as we know that N=120f/P speed of an im can be controled only through changing no if poles, can we control by changing the frequncy????

7 Answers   JSW,

---

dear all, How do i increase UPS (1000VA)backup time ? i have connected 2 12v wold you please 120 aH battery externally. ups charge the lead acid battery only 12.7 volt. backup time only 10.00 minuts and gose off. can any one of you help me?

1 Answers   Technomax, ups,

---

what is pole slip ?

4 Answers   NTPC,

---

how to make a solar panel? why solar panel cell connected to serious?

1 Answers  

---

what is post close & pre close of trip circuit supervision relay in circuit breaker control scheme?

2 Answers   ABB, NEK, Power,

---

what is the calculation of current when a clampmeter is attached to two phases of any drives.

3 Answers   ABB,

---