Answer / gajendra

TRANSFORMER OIL

Answer / raj

a natural mineral oil is used as coolants.

now a days ASKARELS or PYROCLOR is widely used , since non
inflammable. high stability on di-electric . thermal
observation and so many advantages...

Answer / sujol

For trnafomer cooling mostly Crude oil is used.

Answer / gaurav

It is cooling fans and radiators, as such insulating oil is
not a coolant.However the insulating oil is the medium, by
circulating it we can supress the heat

Answer / juhi

it is the transformer oil which is used for cooling purpose in transformer and also whereever required fans are also put for cooling purpose.

Answer / murugan

Large transformers for indoor use must either be of the dry type, that is, containing no liquid, or use a less-flammable liquid.
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 / ponnu(the elite)

oil,water,air.most of all we r using oil

A transformer is used to light a 24volts,70watts lamp from a 240a.c main.The current in the main cable is 0.35A. Calculate, (1) The efficiency of the transformer. (2) the current in the lamp.

1 Answers  

in india why 50 hz and 220 volt taken as standard rating for equipments whereas in US 100hz and 110v is consided as standard rating.is this method save power.

5 Answers   Wipro,

What is Fire Panel ? How it works ?

0 Answers  

WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?

0 Answers  

What is neutral earth voltage of transformer and what should be the value

3 Answers  

what is reasion of harmonic create the power supply , And how to reduced to harmonic

1 Answers   Turbo,

1.Defination of Graund earth and neutral 2.

8 Answers  

How to select busbar?

2 Answers  

how will you calculate rated Primary and Secondary voltage and Current for 2500 KVA, 11kv/443V Transformer

2 Answers  

In an electrical power supply,why if neutral phase of a 3phase supply fail over current occur but if it's single phase supply neutral phase fail low current occur? 

1 Answers  

how we provide neutral earth on synchronising panel as per electrical standards?

0 Answers  

Why Dyn11 Transformer is selected for distribution transformer?

3 Answers   JK Associates, MSETCL Maharashtra State Electricity Transmission Co Ltd,