WHAT IS THE COOLANTS IN TRANSFORMER?
Answers were Sorted based on User's Feedback
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...
Is This Answer Correct ? | 5 Yes | 1 No |
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
Is This Answer Correct ? | 9 Yes | 5 No |
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.
Is This Answer Correct ? | 3 Yes | 1 No |
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.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / ponnu(the elite)
oil,water,air.most of all we r using oil
Is This Answer Correct ? | 2 Yes | 2 No |
How can we convert dc to equivalent ac??
Star & delta kis principale pa hai.
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
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