Answer / jyothis prasad t

Due to temperature rise and fall the oil in t/f expands and
contracts.For this it absorbs & expels air .So in this
process silica gel absorbs the moisture (its the property of
silica gel to absorb moisture.at initial it has a blue
colour & after absorption it turn into cream). Moisture in
oil cause low insulation value and may trip the t/f with
bucholze relay indication.

sourse is 66 KV / 350 MVA, transfarmer is 1000 KVA 6.6 / 0.415 kv, iF fault is 28.75 MVA on 0.415 KV Bus then calculat the Transfarmer Impidance

0 Answers  

---

1. what is difference between VCB and ACB.how its works please explian.

6 Answers   ABB, Accenture, HP, Minda, Mother Dairy, Satyam Pharma,

---

What kind of maintenance is conducted for generator

1 Answers  

---

neutral earth resistance testing is it possible for transformer while in load condition

0 Answers  

---

What is difference b/w Microwave and OPGW ??

1 Answers  

---

what is the right cable size for 100 hp mpter.

3 Answers  

---

difference between substation & grid substation?

2 Answers   GMR,

---

how to calculate the capacitor rating for improving power factor

10 Answers   L&T, Property Solutions, Synergy, TAFE,

---

why should we place 9KV lightning arrestors in 11KV substation ?

9 Answers   DOL, ISRO, Matrix,

---

How to calculate Ith (I thermal) for curent transformer

0 Answers  

---

how a DC clampmeter works if DC cant b step up r down?

1 Answers  

---

what is neutral grounding resistor?

3 Answers  

---