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TRANSFORMER CONSTRUCTION PRESENTED BY K.SURESH ASST. PROFESSOR
TRANSFORMER MAINLY CONSIST OF WINDING CORE TANK INSULATIONS TRANSFORMER OIL BUSHINGS CONSERVATOR BREATHER COOLING OF TRANSFORMER BUCHHOLZ RELAY OIL LEVEL INDICATOR TEMP INDICATOR
WINDINGS Types of transformer windings are, CONCENTRIC SANDWICH Disc Cross over Helical
TYPES OF SANDWICHED COILS
TYPES OF CORE
TANK MADE OF STEEL AND ALUMINIUM (power and traction transformers) MILD STEEL AND ALUMINUM(BESIDE power and traction transformers)
INSULATIONS Dry type Transformers: Varnish Enamel Large size Transformers: Unimpregnated paper Cloths Immersed in Transformer oil – insulation & coolent
TRANSFORMER OIL TRANSFORMER OIL SHOULD HAVE INSULATING PROPERTY VISCOSITY PURITY SLUDGE FORMATION ACIDITY HIGH FLASH POINT AND FIRE POINT
BUSHINGS BUSHINGS CONSIST OF INSULATOR ROD
COOLING OF TRANSFORMERS Methods of cooling: 1.Air Natural (AN)-upto 1.5MVA 2.Air Blast (AB) 3.Oil natural (ON) – Upto 10 MVA 4.Oil Natural – Air Forced (ONAF) 5.Oil Forced– Air Natural (OFAN) – 30 MVA 6.Oil Forced– Air Forced (OFAF) 7.Oil Natural – Water Forced (ONWF) – Power plants 8.Oil Forced - Water Forced (OFWF) – Power plants
OIL LEVEL INDICATOR
THREE PHASE TRANSFRMERS
THREE PHASE TRANSFRMERS(1)
THREE PHASE TRANSFRMERS(2)
HISTORY OF TRANSFORMER 1885 William Stanley's First Transformer built in 1885
1885 William Stanley's First Transformer built in 1885
1885 Shell form transformer. Sketch used by Uppenborn to describe ZBD engineers' 1885 patents and earliest articles.
1886 Stanley's first transformer which was used in the electrification of Great Barrington, Massachusetts in 1886
1891 Transformer used on the Lauffen to Frankfurt demonstration line.Lauffen to Frankfurt demonstration line.
1891 Early three phase transformer (circular core type) Siemens and Halske company 5.7 kVA 1000/100 V
Air cooled transformers built by William Stanley for a three phase AC power station
1917 Large Westinghouse transformers from 1917 at the Hydro-power plant at Folsom, California Hydro-power plant at Folsom, California
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