Answer / hardik vyas

TAN Delta test gives you the condition of the insulation
and also it helps in predicting that how long this
equipment can be in service. In short it gives you the
detoriation rate of insulation so you can predict the
remaining useful period of perticular euipment.

Answer / ashish barak

when insulation is perfect , there is only capacitive
current and angle between current and voltage is 90 degree.
as insulation degrades with time there is a flow of
resitive current also. the angle between capacitave and
resultant current(sum of resitive current and capacitive
current)is this "delta" angle.
as it keeps on increasing it indicates winding is
deterioating

Answer / swati patkar

for checking transformer bushing insulation so that the life of transformer can be predicted and maintenance and replacement should be done timely.

Answer / venky_eee07

to checking transformer bushing

i am iti student i have project to do. that IS 100MW 220\33KV SUBSTATION I WANT TO KNOW HOW TO START, LIKE CALCULATION, WHAT RATING OF CT,CVT, PT, ISOLATOR LIGHTING ARRESTER WAVE TRAP CIRCUIT BREAKER IN 22OKV SIDE, ALSO TO WARDS 33KV SIDE PLS HELP ME WITH THIS, THIS MY LIFE NOW, I KNOW AUTOCAD, I LIKE TO KNOW HOW TO CALCULATE ALL THE THINGS

3 Answers  

---

I am getting diesel genset 62 kv for my house In addition there are 6 meters of 11kv for the house Lift also being installed for house plot sise 200sq yds total 4 + 2 foloors I want to know how much earthing required how deep it should be

2 Answers  

---

Why transformer neutral is earthed

7 Answers   Hyundai,

---

HOW TO CALCULATE AMPs OF CURRENT TRANSFORMER IN HT Panel

0 Answers   MAB,

---

Why we called L-G fault as line to ground fault why ground? suppose if a line falls on building roof then can we called these fault as line to roof fault? please explain why ground term is used here?

3 Answers   Bhel,

---

---

if field current decreases how can the speed increase in the unloaded dc series motor

1 Answers  

---

what will happen if ac and dc supplies given

0 Answers   APTransco,

---

Why saturation region slowly shifted in the left side?

0 Answers  

---

in ac system the current wave form becomes zero for every half cycle then how can we get continuous supply can any one answer to this plsss

2 Answers  

---

I am an electrical power engineer and arranged power system for a data center, I installed MCB, ELCB and erthing system TN-C-S. But some times several ELCBs Disconnect circuits at the same time! what may be the reason? (the ELCBs are 25A ,30mA)

9 Answers  

---

Why donot sleep below the tree for night time?

12 Answers  

---

What is reason of rating of transmission line multi pal of 11 like as 11/33/66/220 ? Why not use 75 kv 23 kv line in power system ?

1 Answers   Apollo, Balco, Bhel, Vardhman,

---