presentation on power transformer
TRANSCRIPT
PRESENTATION ON
POWER TRANSFORMER BY
BHEL
PRESENTED BY:-AJAY KUMAR MAURYA
CONTENTS OF PRESENTATION INRODUCTION TO BHEL ,JHANSI POWER TRANSFORMER DESIGN & DRAWING WINDING MANUFRACTURING CORE BUILDING COIL CORE ASSEMBLY RELACING OF CORE TERMINAL GEAR MOUNTING FINAL TANKING
BHEL(JHANSI UNIT) BHEL, JHANSI foundation was laid by late Mrs. Indira
Gandhi the prime minister on 9th Jan. 1974. The commercial production of the unit began in 1976-77. It is called second-generation plant of BHEL set up at an estimated cost of Rs 16.22 crores inclusive of Rs 2.1 crores for township.
BHEL,JHANSI is equipped with most modern manufacturing processing and testing facilities for the manufacture of power, special transformer and instrument transformer, Diesel shunting locomotives and AC/DC locomotives.
PRODUCT PROFILE OF BHEL,JHANSI
POWER TRANSFORMER A transformer is a static machine used for transforming power
from one circuit to another without changing frequency. Power Transformers refers to the transformers used between
the generator and the distribution circuits, and these are usually rated at 500 kVAand above.
Power Transformers are of following type: 1.Small power transformers 500 to 7500 kVA 2. Medium power transformers 7500KVA to 100 MVA 3. Large power transformers 100 MVA and above.
COMPONENTS OF POWER TRANSFORMER CORE COIL INSULATION TAP CHANGER CONSERVATOR TANK COOLING SYSTEM
DESIGN & DRAWING SPECIFICATIONS OF TRANSFORMER SELECTION OF CORE DIAMETER SELECTION OF TYPE OF CORE SELECTION OF TYPE OF WINDINGS SELECTION OF TAPCHANGER CALCULATION OF NUMBER OF TURNS It is done by using emf equation: Volts per turn, Et=4.44BmAƒ
WINDING MANUFRACTURINGTHERE ARE FOLLOWING TYPE OF WINDINGS:- REVERSE SECTION WINDING SPIRAL WINDING HELICAL WINDING INTERLEAVED WINDING HALF SECTION WINDING COMPOSITE WINDING
REVERSE SECION WINDING SPIRAL WINDING
HELICAL WINDING INTERLEAVED WINDING
CORE BUILDING CRGO-Cold Rolled
Grain Steel is used to build the core. CRGO is used to reduce the hysteresis losses and the lamination made out of these sheets minimizes the eddy’s current losses
COMPLETE CORE
COIL CORE ASSEMBLY COIL CORE ASSEMBLY
INVOLVES THREE MAJOR STEPS
UNLACING OF CORE INSERTION OF WINDING RELACING OF CORE
UNLACED & RELACED CORE
TERMINAL GEAR ASSEMBLY Terminal Gear Assembly
done as described below: Cutting of leads as
required. Crimping/brazing of the
leads with cables. Brazing of bus bars. Fixing of different cleats. Crimping/brazing of
cables with terminal lugs. Mounting of the tap
changer/tap switch.
TAP CHANGER Tapchanger is used for
adding or cutting out turns of primary or secondary winding of the transformer.
THEY ARE OF TWO TYPES ON LOAD TAP CHANGER OFF LOAD TAP CHANGER
TRANSFORMER WITH TAP CHANGER
FINAL TANKING The transformer tank
provides the containment of the core and windings and for oil. It must withstand the forces imposed on it during transport.
Transformer tanks are almost constructed of welded boiler plate.
TRANSFORMER AUXILLARIES BUCHHOLZ RELAY TEMPERATURE INDICATOR PRESSURE RELIEF VALVE BUSHINGS OIL LEVEL INDICATOR SILICA GEL BREATHER
TESTING OF TRANSFORMER Preliminary Tests
Core insulation test Core loss Test
Final Tests Routine test
Measurement of winding resistance Measurement of voltage ratio Measurement of no load loss and current Measurement of insulation resistance
Type Test Temperature rise test Noise level test
COOLING SYSTEMVARIOUS TYPES OF
COOLING ONAN Type Cooling ONAF Type Cooling OFAF Type Cooling OFWF Cooling
COMPLETE TRANSFORMER
THANK YOU