Answer / k.prakashchandra

PRV is provided to prevent tr from bursting due to the internal pressure . It could be from 0.4 Kg/cm2 to 4 Kg /cm2. The older tr s had explosion vent with copper foil

A 3-PHASE TRANSFORMER IS USED TO STEP-DOWN THE VOLTAGE OF A 3-PHASE, 11KV FEEDER LINE. PER-PHASE TURNS RATIO IS 12.FOR A PRIMARY LINE CURRENT OF 20A, CALCULATE THE SECOUNDRY LINE VOLTAGE, LINE CURRENT AND OUTPUT KVA FOR FOLLOWING.A)STAR- DELTA.B)DELTA-DELTA.

0 Answers   Ispat, Red Bull,

---

in 132 kv substation ligtning arrestor(120 kv) connected to line. but line voltage comes to 132 kv, it operate or not???

4 Answers   Divis Laboratories,

---

the input mechanical power of a single alternator is increased,its RPM increased but in case of an alternator synchronised with grid its RPM does not increased with increase of input mechanical power. why?

3 Answers   Bhel,

---

Why the frequency of ac in india is 50 hz but in some other countries it is 60 hz.

0 Answers   BARC, Fedco, Qasco,

---

how do using transformer 30 deg lag or 30 deg lead

1 Answers  

---

The purpose of a choke is to provide a ?

1 Answers  

---

in transformers for ex. 100mva and 400kv the secondary current is about 420 amps but for selection of bushing the capacity of selected bushing is 2000A why there is such big difference ?

2 Answers   ABB,

---

how was your last weekend.

0 Answers   HCL,

---

Why the motor take high starting current for long time(10- 15 sec) which is connected to Blower as compaire with a motor which is connected with pump with same rating?

2 Answers  

---

Give two basic sprrd control scheme of DC shunt motor.

2 Answers  

---

What is the complete procedure of erection of electrical panel in industry

0 Answers   BTM, Imerys,

---

transformer core are laminated for what purpose?

9 Answers   NTPC,

---