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Design of transformers [electronic resource] / by Indrajit Dasgupta.

Por: Dasgupta, Indrajit [].
Tipo de material: TextoTextoEditor: New York, N.Y. : McGraw-Hill Education LLC., c2002Descripción: xxvii, 537 p. : ill., figs., tables.ISBN: 9780070436404; 0070436401.Tema(s): Electric transformers -- Design | Electric insulators and insulation -- OilsClasificación CDD: 621.314 Recursos en línea: Haga clic para acceso en línea Also issued in print and PDF version.
Contenidos:
A. Dedication -- B. Preface -- C. Acknowledgements -- D. At a glance -- Chapter 1 working principle of a transformer -- Chapter 2 requirements of transformer specifications from end-users -- Chapter 3 basic materials and their processing -- Chapter 4 the basic concept of design -- Chapter 5 design of the 100 kva transformer -- Chapter 6 design of the 630 kva transformer -- Chapter 7 design of the 5 mva, 33/11 kv transformer -- Chapter 8 the design concept of the distribution transformers under repair contract -- Chapter 9 the basic concept of computer-aided design -- Chapter 10 dry-type distribution transformers with polyestermide vpi—a new concept in india -- Chapter 11 process control -- Chapter 12 a schedule of tests and their procedures -- Chapter 13 user's installation and instruction manual for transformers in services -- Chapter 14 draft specification for the 25, 63 and 100 kva, 11/0.433 kv aluminium-wound conventional type distribution transformers -- Chapter 15 nature of failures and their causes -- Chapter 16 conclusion -- E. List of abbreviations -- 1. Working principle of a transformer -- Introduction -- The working principle -- The formula for induced emf -- Alignment chart -- Shell and core type transformer -- Transformer cores -- Windings and insulations -- End-turn insulation -- Transformer losses -- The power scenario in india -- Summary -- 2. Requirements of transformer specifications from end-users -- Requirement of specification -- Mandatory specification -- Supplementary specification -- Additional specification -- Requirement fill-up standard gtp format -- Summary -- 3. Basic materials and their processing -- Introduction -- Crgo (stacked core) -- Crgo slitting -- Types of slitter lines -- Layout of a slitter line -- Requirement of slitting operation -- Construction of blade -- Recommendations for better slitting -- Clearance adjustment operations -- Influence of shear angle at slitting (grain-oriented) -- Hold the strips near the blade firmly with the stabilizer -- Crgo steel processing -- Annealing -- Core-building -- Step-lap -- Winding wires and strips -- Processing wire drawing -- Die materials -- Processing strip drawing -- Annealing of wires and strips -- Annealing of copper -- Annealing of aluminium -- Insulating paper -- Paper covering on the conductor -- Tests on paper covered conductor -- Reference iss for wires and strips -- Details of machineries for wires and strips -- Process chart -- Choice of using copper or aluminium as winding material -- Insulating oil -- Introduction -- Chemistry of transformer oil -- Refining of tofs -- Characteristic properties and specification -- Storage and handling of transformer oil -- Dedicated handling -- Transport in tankers or drums -- Compatibility and contaminants -- Other major raw materials and components -- Summary.
4. The basic concept of design -- Selection of number of turns -- Selection of the core diameter -- Selection of winding wires and strips -- Calculation of size of a high-voltage conductor -- Calculation of size of a low-voltage conductor -- Transposition -- Process flow chart -- Summary -- 5. Design of a 100 kva transformer -- Proposed specification -- Primary coil -- Secondary coil -- Core diameter -- Step width -- Core stack -- Core area -- Flux density -- Coil diameter and core limb centre -- Core details -- Approximate weight of core -- Step-wise weight calculation of core -- Winding details -- Coil assembly -- Weight of lv and hv aluminium -- Winding resistance and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Ratio error at different tap positions -- Efficiency -- Maximum efficiency -- Regulations -- Performance figures -- Design outputs -- The design of tank -- Radiators -- Weight of tank -- Core fittings, tie rods and core studs -- Volume of oil -- Overall weights and dimensions -- Preparation of drawings and gtp -- Conclusion -- Summary -- 6. Design of the 630 kva transformer -- Proposed specification -- Primary coil (connected in delta) -- Secondary coil (connection star) -- Core diameter -- Step width -- Core stack -- Core area -- Flux density -- Coil diameter and core limb centre -- Core details -- Approximate weight of core -- Stepwise weight calculation of core -- Winding details -- Coil assembly specification -- Weight of lv and hv copper -- Winding resistance and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Ratio error at different tap positions -- Efficiency -- Maximum efficiency -- Regulations -- Performance figures -- Design outputs -- Design of tank -- Radiators -- Weight of tank -- Non-magnetic welding -- Core fittings, tie rods and core studs -- Volume of oil -- Overall weights and dimensions -- Preparation of drawings and gtp -- Conclusion -- Summary -- 7. Design of the 5 mva, 33/11 kv transformer -- Proposed specification -- Selection of primary and secondary conductor -- Number of turns -- Disc details of coils -- Core diameter -- Formation of lv coil -- Formation of hv coil -- Amp-turns balancing -- Core details -- Winding specification -- Weight of secondary and primary windings -- Winding resistances and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Efficiency -- Regulations -- Performance figures -- Design output -- Design of tank -- Radiators -- Conclusion -- Summary.
8. The design concept of distribution transformers under repair contract -- Basic requirement -- Basic input of design -- Progress of designing a repair transformer -- Design procedure -- Lv and hv conductor weight -- Placement of hv coil -- Calculation of winding resistances and load loss -- Impedance -- No-load loss -- Winding specification and assembly details -- Other aspects of design -- Cleaning of crgo laminations and tank -- Final assembly and testing -- Summary -- 9. The basic concept of computer-aided design -- Basic concept of computer-aided design -- Who all can handle computer-aided design -- Specified-need of the specification -- Implied-needs of the specification -- Computer programming -- Variable inputs -- Review of the figures which are fed as variable inputs -- Operation -- Non-converging -- Design output -- Design modification -- Other aspects of the design -- Design validation -- Design package -- Computer design print-out -- Summary -- 10. Dry-type distribution transformers with polyesterimide vpi (a new concept in india) -- Introduction -- Dry-type transformer -- Insulation system -- Impregnant -- Vpi plant requirements -- Economic impregnation -- Application of dry-type transformer -- Summary -- 11. Process control -- Introduction -- Role of the machine -- Machine maintenance -- Role of materials -- Role of men -- The manufacturing process -- Inprocess inspection -- Proto-type results -- Summary -- 12. Schedule of tests and their procedures -- A schedule of tests -- Procedure of tests -- Test sl. No. 1: separate source power frequency test on hv and lv winding (routine test) -- Test sl. No. 2: induced over voltage test (routine test) -- Test sl. No. 3: insulation resistance of hv and lv windings (routine test) -- Test sl. No. 4: di-electric value of insulating oil (acceptance test) -- Test sl. No. 5: measurement of winding resistance (routine test) -- Test sl. No. 6: measurement of no-load loss and no-load current (routine test) -- Test sl. No. 7: measurement of load loss and impedance (routine test) -- Test sl. No. 8: voltage ratio and phase relationship (routine test) -- Test sl.no.9: temperature rise test (type test) -- Test sl. No. 10: lightning impulse test (type test) -- Test sl. No. 11: requirement and procedure with regard to ability to withstand short-circuit test (special test) -- Test sl. No. 12: un-balance current on lv neutral (special test) -- Test sl. No. 13: zero sequence impedance (special test) -- Test sl. No. 14: magnetic balance test (special test) -- Test sl. No. 15: measurement of noise level (special test) -- Conclusion -- Summary.
13. User's installation and instruction manual for transformers in services -- Introduction -- Installation -- Oil -- Drying of transformer at site -- Gasket and gasket joints -- Cable box -- Conservator -- Silicagel breather -- Explosion vent -- Buchholz relay -- Temperature indicator -- Off-circuit tap switch -- Earthing -- Minimum acceptable insulation resistance -- Painting -- Completion of erection work -- Parallel operation -- Testing and commissioning -- Check list before commissioning -- Energising -- Maintenance -- Summary -- 14. Draft specification for 25, 63 and 100 kva, 11/0.433 kv aluminium-wound conventional distribution transformers -- Scope -- Applicable standard -- Rating -- Rated frequency -- Taps -- Permissible flux density and over-fluxing -- Current density -- No-load voltage ratio -- Transformer oil -- Winding connections and vectors -- Rating and terminal marking plate -- Limits of temperature rise -- Losses and impedance -- Insulation level -- Constructional features -- Tank construction -- Silicagel breather -- Gaskets -- Location of thermometer pocket -- Surface preparation and painting -- Core material and its construction -- Base mounting arrangement -- Clearances -- Test and inspection -- Procedure of inspection -- Submittals -- Tolerances -- Deviation -- Preference -- Quality assurance plan -- List of fittings and accessories -- Schedule of guaranteed technical particulars for 25, 63 and 100 kva, 11/0.433 kv, aluminium-wound transformers -- Summary -- 15. Nature of failures and their causes -- Introduction -- Type of failure -- Causes of failure -- Analysis of faults -- Cause of failure due to fault in the magnetic circuit -- Cause of failure due to failure in the electric circuit -- Failure due to external short-circuit -- Summary -- 16. Conclusion -- Annexure—a -- 17. Annexure—b -- Short-circuit test.
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Recurso Electrónico Recurso Electrónico Biblioteca Fundación Área Andina - Medellín
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Recurso Electrónico Recurso Electrónico Biblioteca General Fundación Área Andina - Bogotá
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"Basic materials and their processing included; Design specs of 100 KVA, 630 KVA, 5MVA, 33/11 KV transformers covered; Process control based on ISO 9000, test, nature of failures and their causes discussed."-- Cover

Includes bibliographical references and indexes.

A. Dedication -- B. Preface -- C. Acknowledgements -- D. At a glance -- Chapter 1 working principle of a transformer -- Chapter 2 requirements of transformer specifications from end-users -- Chapter 3 basic materials and their processing -- Chapter 4 the basic concept of design -- Chapter 5 design of the 100 kva transformer -- Chapter 6 design of the 630 kva transformer -- Chapter 7 design of the 5 mva, 33/11 kv transformer -- Chapter 8 the design concept of the distribution transformers under repair contract -- Chapter 9 the basic concept of computer-aided design -- Chapter 10 dry-type distribution transformers with polyestermide vpi—a new concept in india -- Chapter 11 process control -- Chapter 12 a schedule of tests and their procedures -- Chapter 13 user's installation and instruction manual for transformers in services -- Chapter 14 draft specification for the 25, 63 and 100 kva, 11/0.433 kv aluminium-wound conventional type distribution transformers -- Chapter 15 nature of failures and their causes -- Chapter 16 conclusion -- E. List of abbreviations -- 1. Working principle of a transformer -- Introduction -- The working principle -- The formula for induced emf -- Alignment chart -- Shell and core type transformer -- Transformer cores -- Windings and insulations -- End-turn insulation -- Transformer losses -- The power scenario in india -- Summary -- 2. Requirements of transformer specifications from end-users -- Requirement of specification -- Mandatory specification -- Supplementary specification -- Additional specification -- Requirement fill-up standard gtp format -- Summary -- 3. Basic materials and their processing -- Introduction -- Crgo (stacked core) -- Crgo slitting -- Types of slitter lines -- Layout of a slitter line -- Requirement of slitting operation -- Construction of blade -- Recommendations for better slitting -- Clearance adjustment operations -- Influence of shear angle at slitting (grain-oriented) -- Hold the strips near the blade firmly with the stabilizer -- Crgo steel processing -- Annealing -- Core-building -- Step-lap -- Winding wires and strips -- Processing wire drawing -- Die materials -- Processing strip drawing -- Annealing of wires and strips -- Annealing of copper -- Annealing of aluminium -- Insulating paper -- Paper covering on the conductor -- Tests on paper covered conductor -- Reference iss for wires and strips -- Details of machineries for wires and strips -- Process chart -- Choice of using copper or aluminium as winding material -- Insulating oil -- Introduction -- Chemistry of transformer oil -- Refining of tofs -- Characteristic properties and specification -- Storage and handling of transformer oil -- Dedicated handling -- Transport in tankers or drums -- Compatibility and contaminants -- Other major raw materials and components -- Summary.

4. The basic concept of design -- Selection of number of turns -- Selection of the core diameter -- Selection of winding wires and strips -- Calculation of size of a high-voltage conductor -- Calculation of size of a low-voltage conductor -- Transposition -- Process flow chart -- Summary -- 5. Design of a 100 kva transformer -- Proposed specification -- Primary coil -- Secondary coil -- Core diameter -- Step width -- Core stack -- Core area -- Flux density -- Coil diameter and core limb centre -- Core details -- Approximate weight of core -- Step-wise weight calculation of core -- Winding details -- Coil assembly -- Weight of lv and hv aluminium -- Winding resistance and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Ratio error at different tap positions -- Efficiency -- Maximum efficiency -- Regulations -- Performance figures -- Design outputs -- The design of tank -- Radiators -- Weight of tank -- Core fittings, tie rods and core studs -- Volume of oil -- Overall weights and dimensions -- Preparation of drawings and gtp -- Conclusion -- Summary -- 6. Design of the 630 kva transformer -- Proposed specification -- Primary coil (connected in delta) -- Secondary coil (connection star) -- Core diameter -- Step width -- Core stack -- Core area -- Flux density -- Coil diameter and core limb centre -- Core details -- Approximate weight of core -- Stepwise weight calculation of core -- Winding details -- Coil assembly specification -- Weight of lv and hv copper -- Winding resistance and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Ratio error at different tap positions -- Efficiency -- Maximum efficiency -- Regulations -- Performance figures -- Design outputs -- Design of tank -- Radiators -- Weight of tank -- Non-magnetic welding -- Core fittings, tie rods and core studs -- Volume of oil -- Overall weights and dimensions -- Preparation of drawings and gtp -- Conclusion -- Summary -- 7. Design of the 5 mva, 33/11 kv transformer -- Proposed specification -- Selection of primary and secondary conductor -- Number of turns -- Disc details of coils -- Core diameter -- Formation of lv coil -- Formation of hv coil -- Amp-turns balancing -- Core details -- Winding specification -- Weight of secondary and primary windings -- Winding resistances and load loss -- No-load loss -- No-load current -- Percentage reactance, resistance and impedance -- Efficiency -- Regulations -- Performance figures -- Design output -- Design of tank -- Radiators -- Conclusion -- Summary.

8. The design concept of distribution transformers under repair contract -- Basic requirement -- Basic input of design -- Progress of designing a repair transformer -- Design procedure -- Lv and hv conductor weight -- Placement of hv coil -- Calculation of winding resistances and load loss -- Impedance -- No-load loss -- Winding specification and assembly details -- Other aspects of design -- Cleaning of crgo laminations and tank -- Final assembly and testing -- Summary -- 9. The basic concept of computer-aided design -- Basic concept of computer-aided design -- Who all can handle computer-aided design -- Specified-need of the specification -- Implied-needs of the specification -- Computer programming -- Variable inputs -- Review of the figures which are fed as variable inputs -- Operation -- Non-converging -- Design output -- Design modification -- Other aspects of the design -- Design validation -- Design package -- Computer design print-out -- Summary -- 10. Dry-type distribution transformers with polyesterimide vpi (a new concept in india) -- Introduction -- Dry-type transformer -- Insulation system -- Impregnant -- Vpi plant requirements -- Economic impregnation -- Application of dry-type transformer -- Summary -- 11. Process control -- Introduction -- Role of the machine -- Machine maintenance -- Role of materials -- Role of men -- The manufacturing process -- Inprocess inspection -- Proto-type results -- Summary -- 12. Schedule of tests and their procedures -- A schedule of tests -- Procedure of tests -- Test sl. No. 1: separate source power frequency test on hv and lv winding (routine test) -- Test sl. No. 2: induced over voltage test (routine test) -- Test sl. No. 3: insulation resistance of hv and lv windings (routine test) -- Test sl. No. 4: di-electric value of insulating oil (acceptance test) -- Test sl. No. 5: measurement of winding resistance (routine test) -- Test sl. No. 6: measurement of no-load loss and no-load current (routine test) -- Test sl. No. 7: measurement of load loss and impedance (routine test) -- Test sl. No. 8: voltage ratio and phase relationship (routine test) -- Test sl.no.9: temperature rise test (type test) -- Test sl. No. 10: lightning impulse test (type test) -- Test sl. No. 11: requirement and procedure with regard to ability to withstand short-circuit test (special test) -- Test sl. No. 12: un-balance current on lv neutral (special test) -- Test sl. No. 13: zero sequence impedance (special test) -- Test sl. No. 14: magnetic balance test (special test) -- Test sl. No. 15: measurement of noise level (special test) -- Conclusion -- Summary.

13. User's installation and instruction manual for transformers in services -- Introduction -- Installation -- Oil -- Drying of transformer at site -- Gasket and gasket joints -- Cable box -- Conservator -- Silicagel breather -- Explosion vent -- Buchholz relay -- Temperature indicator -- Off-circuit tap switch -- Earthing -- Minimum acceptable insulation resistance -- Painting -- Completion of erection work -- Parallel operation -- Testing and commissioning -- Check list before commissioning -- Energising -- Maintenance -- Summary -- 14. Draft specification for 25, 63 and 100 kva, 11/0.433 kv aluminium-wound conventional distribution transformers -- Scope -- Applicable standard -- Rating -- Rated frequency -- Taps -- Permissible flux density and over-fluxing -- Current density -- No-load voltage ratio -- Transformer oil -- Winding connections and vectors -- Rating and terminal marking plate -- Limits of temperature rise -- Losses and impedance -- Insulation level -- Constructional features -- Tank construction -- Silicagel breather -- Gaskets -- Location of thermometer pocket -- Surface preparation and painting -- Core material and its construction -- Base mounting arrangement -- Clearances -- Test and inspection -- Procedure of inspection -- Submittals -- Tolerances -- Deviation -- Preference -- Quality assurance plan -- List of fittings and accessories -- Schedule of guaranteed technical particulars for 25, 63 and 100 kva, 11/0.433 kv, aluminium-wound transformers -- Summary -- 15. Nature of failures and their causes -- Introduction -- Type of failure -- Causes of failure -- Analysis of faults -- Cause of failure due to fault in the magnetic circuit -- Cause of failure due to failure in the electric circuit -- Failure due to external short-circuit -- Summary -- 16. Conclusion -- Annexure—a -- 17. Annexure—b -- Short-circuit test.

Also issued in print and PDF version.

Description based on cover image and table of contents, viewed on Oct. 24, 2014.


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