Answer / ankamsreekar

Transformer oil, or insulating oil, is usually a highly-refined
mineral oil that is stable at high temperatures and has
excellent electrical insulating properties. It is used in oil
filled transformers, some types of high voltage capacitors,
fluorescent lamp ballasts, and some types of high voltage
switches and circuit breakers. Its functions are to insulate,
suppress corona and arcing, and to serve as a coolant.

Well into the 1970s, polychlorinated biphenyls (PCB)s were
often used as a dielectric fluid since they are not
flammable. They are toxic, and under incomplete combustion,
can form highly toxic products such as furan. Starting in
the early 1970s, concerns about the toxicity of PCBs have
led to their banning in many countries.

Today, non-toxic, stable silicon-based or fluorinated
hydrocarbons are used, where the added expense of a
fire-resistant liquid offsets additional building cost for a
transformer vault. Combustion-resistant vegetable oil-based
dielectric coolants and synthetic pentaerythritol tetra
fatty acid (C7, C8) esters are also becoming increasingly
common as alternatives to naphthenic mineral oil. Esters are
non-toxic to aquatic life, readily biodegradable, and have a
lower volatility and a higher flash points than mineral oil.

Answer / guest

phyro chlore

Answer / babu

phyro chlore

What is the lower limit of break-down voltage of converter transformer.

0 Answers   Tata Steel Limited,

---

what does mean for "mah" for mobile batteries like 1500mah,1300mah??

2 Answers  

---

State the formula for overall efficiency of thermal power station

0 Answers  

---

Can anyone provide with a SLD for HT panel installation for a 33KV line and distribution end has three 1.5MV transformers. Is it suitable to use OCB or VCB and also provide me the suitable rating and its connection diagram.

0 Answers   TATA,

---

1.what to do if ferquency of any power system continue to decrease ?

5 Answers   NTPC,

---

---

what is the meaning of TRF

1 Answers   Khidmah,

---

What will be happend if we not ground CT secondary?

3 Answers   Enercon, Engro, THDC,

---

A IS TWICE AS GOOD A WORKMAN AS B AND TOGETHER THEY FINISH A PIECE OF WORK IN 14 DAYS.THE NUMBER OF DAYS TAKEN BY A ALONE TO FINISH THE WORK IS 1.11 2.21 3.28 4.42

3 Answers   Ramky,

---

what should be the resistance between two winding. Let 10 kw motor

3 Answers  

---

There is 15 KVA UPS using for single phase load.And 30 batteries of 12 V, 100 Ah are connected in series. Load is taking 15 A current.What will be the back up power for this UPS on same load?

1 Answers   BS, Dynamic Software,

---

What are the basic component of a cro?

0 Answers  

---

what will be happened when a single phase motor is supplied by the dc supply

3 Answers  

---