Rotors of Steam Turbine Generators

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● SYNCHRONOUS MACHINES
● Synchronous Machines
● Physical Description of a
Synchronous Machine
● Rotors of Steam Turbine Generators
● Rotors of Hydraulic Units
● Balanced Steady State Operation
● Transient Operation
● Direct and Quadrature Axes
● Mathematical Descriptions of a Synchronous Machine
● Review of Magnetic Circuit Equations (Single Excited Circuit)
● Review of Magnetic Circuit Equations (Coupled Circuits)
● Basic Equations of a Synchronous Machine
● The dqo Transformation
● Physical Interpretation of dqo Transformation
● Per Unit Representation
● P.U. Machine Equations in
dqo reference frame
● P.U. Machine Equations in dqo Reference Frame (cont’d)
● Steady State Analysis Phasor Representation
● Steady State Analysis Phasor Representation (cont’d)
● Internal Rotor Angle
● Electrical Transient Performance
● Short Circuit Currents of a Synchronous Machine
● Short Circuit Currents of a Synchronous Machine (cont’d)
● Elimination of dc Component by Neglecting Stator Transients
● Short Circuit Currents with Stator Transients Neglected
● Synchronous Machine Representation in System Stability Studies
● Equation of Motion (Swing Equation)
● Equation of Motion (cont’d)
● Magnetic Saturation
● Assumptions Normally Made in the Representation of Saturation
● Open-Circuit Characteristic (OCC)
● Example 3.3
● Simplified Models for Synchronous Machines
● Reactive Capability Limits of Synchronous Machines
● Armature Current Limit
● Field Current Limit
● End Region Heating Limit
● Reactive Capability Limit of a 400 MVA Hydrogen Cooled Steam Turbine Generator
● Effect of Changes in Terminal Voltage Et

نوع زبان: انگلیسی حجم: 4.64 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 48 صفحه
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گروه موضوعی: زمان استخراج مطلب: 2019/05/15 09:00:51

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

rotor, stator, circuit, ۱۵۳۹pk, winding, sm, machine, synchronous, figure, axis, mmf, phase,

توجه: این مطلب در تاریخ 2019/05/15 09:00:51 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.cigre.org.br/archives/pptcigre/02-1_synchronous_machines.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: rotor, stator, circuit, ۱۵۳۹pk, winding, sm, machine, synchronous, figure, axis, mmf, phase,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

۱۵۳۹pk synchronous machines copyright p. kundur this material should not be used without the author s consent ۱۵۳۹pk sm synchronous machines physical description mathematical model park s dqo transportation steady state analysis phasor representation in d q coordinates link with network equations definition of rotor angle representation of synchronous machines in stability studies neglect of stator transients magnetic saturation simplified models synchronous machine parameters reactive capability limits outline ۱۵۳۹pk sm physical description of a synchronous machine consists of two sets of windings ۳ phase armature winding on the stator distributed with centres ۱۲ ° apart in space field winding on the rotor supplied by dc two basic rotor structures used salient or projecting pole structure for hydraulic units low speed round rotor structure for thermal units high speed salient poles have concentrated field windings usually also carry damper windings on the pole face. round rotors have solid steel rotors with distributed windings nearly sinusoidal space distribution of flux wave shape obtained by distributing stator windings and field windings in many slots round rotor shaping pole faces salient pole ۱۵۳۹pk sm rotors of steam turbine generators traditionally north american manufacturers normally did not provide special damper windings solid steel rotors offer paths for eddy currents which have effects equivalent to that of amortisseur currents european manufacturers tended to provide for additional damping effects and negative sequence current capability wedges in the slots of field windings interconnected to form a damper case or separate copper rods provided underneath the wedges figure ۳.۳ solid round rotor construction ۱۵۳۹pk sm rotors of hydraulic units normally have damper windings or amortisseurs non magnetic material usually copper rods embedded in pole face connected to end rings to form short circuited windings damper windings may be either continuous or non continuous space harmonics of the armature mmf contribute to surface eddy current therefore pole faces are usually laminated figure ۳.۲ salient pole rotor construction ۱۵۳۹pk sm balanced steady state operation net mmf wave due to the three phase stator windings travels at synchronous speed appears stationary with respect to the rotor and has a sinusoidal space distribution mmf wave due to one phase figure ۳.۷ spatial mmf wave of phase a ۱۵۳۹pk sm balanced steady state operation the mmf wave due to the three phases are ۱۵۳۹pk sm balanced steady state operation magnitude of stator mmf wave and its relative angular position with respect to rotor mmf wave depend on machine output for generator action rotor field leads stator field due to forward torque of prime mover for motor action rotor field lags stator field due to retarding torque of shaft load figure ۳.۸ stator and rotor mmf wave shapes ۱۵۳۹pk sm transient operation stator and rotor fields may vary in magnitude with respect to time have different speed currents flow not only in the field and stator windings but also in damper windings if present and solid rotor surface and slot walls of round rotor machines figure ۳.۴ current paths in a round rotor ۱۵۳۹pk sm direct and quadrature axes the rotor has two axes of symmetry for the purpose of describing synchronous machine characteristics two axes are defined the direct d axis centered magnetically in the centre of the north pole the quadrature q axis ۹ electrical degrees ahead of the d axis figure ۳.۱ schematic diagram of a ۳ phase synchronous machine ۱۵۳۹pk sm mathematical descriptions of a synchronous machine for purposes of analysis the induced currents in the solid rotor and or damper windings may be assumed to flow in two sets of closed circuits one set whose flux is in line with the d axis and the other set whose flux is along the q axis the following figure shows the circuits involved figure ۳.۹ stator and rotor circuits ۱۵۳۹pk sm review of magnetic circuit equations single excited circuit consider the elementary circuit of figure ۳.۱ the inductance by definition is equal to flux linkage per unit current where p permeance of magnetic path flux mmf p nip figure ۳.۱ single excited magnetic circuit ۱۵۳۹pk sm review of magnetic circuit equations coupled circuits consider the circuit shown in figure ۳.۱۱ with l۱۱ self inductance of winding ۱ l۲۲ self inductance of winding ۲ l۲۱ mutual inductance between winding ۱ and ۲ figure ۳.۱۱ magnetically coupled circuit ۱۵۳۹pk sm basic equations of a synchronous machine the equations are complicated by the fact that the inductances are functions of rotor position and hence vary with time the self and mutual inductances of stator circuits vary with rotor position since the permeance to flux paths vary the mutual inductances between stator and rotor circuits vary due to relative motion between the windings ۱۵۳۹pk sm basic equations of a synchronous machine dynamics of a synchronous machine is given by the equations of the coupled stator and rotor circuits stator voltage and flux linkage equations for phase a similar equations apply to phase b and phase c rotor circuit voltage and flux linkage equations ۱۵۳۹pk sm the dqo transformation the dqo transformation also called park s transformation transforms stator phase quantities from the stationary abc reference frame to the dqo reference frame which rotates with the rotor the above transformation also applies to stator flux linkages and voltages with the stator quantities expressed in the dqo reference frame all inductances are independent of rotor position except for the effects of magnetic saturation under balanced steady state operation the stator quantities appear as dc quantities during electromechanical transient conditions stator quantities vary slowly with frequencies in the range of ۱. to ۳. hz the above simplify computation and analysis of results. ۱۵۳۹pk sm physical interpretation of dqo transformation the dqo transformation may be viewed as a means of referring the stator quantities to the rotor side in effect the stator circuits are represented by two fictitious armature windings which rotate at the same speed as the rotor such that the axis of one winding coincides with the d axis and that of the other winding with the q axis the currents id and iq flowing in these circuits result in the same mmf s on the d and q axis as …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: rotor, stator, circuit, ۱۵۳۹pk, winding, sm, machine, synchronous, figure, axis, mmf, phase,

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http://www.cigre.org.br/archives/pptcigre/02-1_synchronous_machines.ppt

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