Details of Conservator tank of Transformer is given below:
Now, we describe why the conservator tank fitted to the power transformer?
Conservator is the most vital part of the transformer, because the Conservator tank takes up the expansion & contraction of oil during running operation. When the load of the transformer is increased, the temperature of oil also increases, hence total volume of the oil increases and absorbs the increased volume of oil in upper space of the conservator tank. If the conservator tank is not fitted to the transformer, the transformer will burst out due to high oil pressure at full loading condition of transformer.The outer and inner portion of conservator tank is shown in figure.
In the large capacity of the power transformer ( above 5 MVA ), a Flexible separator ( Air Cell ) is provided inside the conservator for avoiding direct contact air with the transformer oil.Air Cell provides a permanent, flexible and non-porous barrier between the atmosphere and the transformer oil without affecting the operational function of the system. The basic construction of the separator is a high resistance fabric coated externally to resist transformer oil and internally to Ozone and weather resistance. The following advantage is given below:-
Flexible separators are made from coated fabric consisting of :
Major characteristics of materials are listed below:- Mass-1400 g/m2 Coating- Poly acrylonitrile butadiene Textile Reinforcement- Polyamide Breaking Strength before immersion in oil--> 300 da N/5 cm.
More details go to:
Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. c) The saturation voltage VCE for silicon transistor is same as that for germanium. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor.
Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor.
Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Semiconductors b) Conductors c) Insulators d) Alloys
Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally? a) UJT b) CUJT c) PUT d) None of the above