Answer / parmod kuma

In annual maintenance we check the following points in oil
type transformer

1. We check the die-electric strenth of the oil.
2. We check moisture of the oil.
3. we check Be=reak down voltage of the oil.
4. We check the earthing of the transformer
5. We check Silica gel .
6. We calliberate all the relay like over corrent, earth
fault & differntial relay.

Answer / k.prakashchandra

Inspections- Foundation and pipe connections
.Preventive-Relays and alarm system,earth
resistance,comprehensive oil test

why d.c motor speed decress with increass in load?

1 Answers  

---

electrical knowelge

0 Answers  

---

What is the formula to find out the kvar required to improve the powerfactor from .85 to .99 at 1500kw, 415v.

4 Answers   Trident,

---

Explain mechanical rotational system?

0 Answers  

---

1.Why use in ups in software's,reason,and pls explain. 2.what is the isolation transformer and main use it's functioning and partes.

5 Answers   TATA, Wipro,

---

how motor should be connected i.e star-delta or star-star or delta-delta ?

3 Answers   GSE,

---

What is the main uses of VCB & ACB?

2 Answers  

---

What is the function of pulse transformer?

4 Answers   Electrotherm,

---

How to calculate the breaker's short circuit current?

1 Answers  

---

Why the resistance grounding (NGR) is better than Solid grounding?

5 Answers  

---

What is dynamo?How it works and what is the function of dynamo in a DG.

0 Answers  

---

how to calculate the voltage drop in electrical cable while laying cables?

2 Answers  

---