Answer / nagarajan

For example 20/25MVA Power Trans -132/6.9kv
1. FLC of Secondary=2092A
2.Phase to Phase Voltage for Secondary=6.9/1.732=3.98Kv
3.NGR =3980/2092=V/I=1.90Ohms for 30sec
It is only for power transformer.

How to calculated capacitor rating both HT

10 Answers   Reliance,

---

Is it required to lay GI wires along with GI/MS conduits from one point to another point though separate earthing cable is conncted from DB to Socket?

0 Answers  

---

FACP Means

1 Answers   RR,

---

Why choke coil is connected in series with starter in tubelight??why starter is connected in parallel to tubelight??

0 Answers  

---

What is the List of Equipments, Instruments, Components required in Transmission of electricity from 1 substation to other substation(The equipments required in substation too)? What are the differnt IS standrds used for above equipments in Industry?

2 Answers  

---

why in an industry; machine having rated 200 h.p stopped after power factor is maintained above 0.97 lag by control panel in view-of energy saving

0 Answers   HCL,

---

My system is 22kv/3.3kv transformer. client is asking to use NGR, but as we have dedicated Neutral Earthing systems which has a value less than 1 Ohm. So i want solid comparision. Why i should not use NGR as my system is already protected.Can any one help me to get out of this.how should i reply on basis of some great comparision and calculations. Please help

2 Answers   Ariel,

---

what is advantage in open delta connection?

20 Answers  

---

why do we not use equivalent voltage source in negative sequence equivalent ckt.

0 Answers   TATA,

---

purpose of check value

1 Answers   Seagate,

---

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT-SWITCH BOARD,MLDB,ACB,BUSBAR,ETC,......?

0 Answers  

---

from where the self excitrd induction generator get the power?why is the voltage regulation is poor of seig?

0 Answers  

---