Answer Posted / a.p.nanjappa

PU means PER UNIT VALUE.
this is used by protection engineers application.
refer CEGB, ABB,SIEMENS HAND BOOK FOR CALCULATION OF FAULT
CURRENT.

if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

1943

---

3 phase Motor will be given 2 phase after 2 to 5 second we given 3rd phase so Motor Run sum-time in forward or sum time run reverse direction. All time phase sequence is not change. Why motor run in reverse direction? Please Explain........

2019

---

i want to learn control schedule for 11kv panel? can any one send the detailed control schedule?

2476

---

hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com

1829

---

State and define ohm’s law?

1196

---

WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.

3627

---

What Normal(Tangent) towers and Tension(Cut-point) Towers?

6287

---

why are u join ntpc

2208

---

Hi,I am working in abroad for more than 3 years in a company operating with 11kv and 6.4 MW power. I need c licence in India,can I? some other says only i can get if i work for 2 years in india only! anybody kindly clarify by doubt.Thanks

1901

---

How out of step protection relay works?

2534

---

substation+ plc system

2131

---

can u describe the method used for protection of transmission line.

2258

---

We have given to 3phase supply to ups system & how can coming netural

2215

---

Alternator rotor earth fault relay circuit

2108

---

formula for calculation of switchgears(i.e. contactor, fuse, cb, relay etc.), if load current is given?

2272

---