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Hydrogenerator basic design calculation PDF

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Added on 2021-07-13

Hydrogenerator basic design calculation PDF

Added on 2021-07-13

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CHAPTER 2HYDROGENERATOR BASIC DESIGN CALCULATIONAs a basic case for the consideration of the hydrogenerator losses reductionand improving its efficiency, hydrogenerators are designed in accordance with therecommendations of the textbook “Design of Hydrogenerators and SynchronousCompensators” by A. V. Ivanov-Smolensky, A. I. Abramov and ‘‘Electric MachinesDesign ’’ by I. P. Kopilov, B. K. Klakov, V. P. Marozin.In this thesis, will be calculate Yeywa data hydrogenerator design andtheoretical hydrogenerator design. The rated capacity 230 MVA.The cost will not be considered in these design calculations.2.1.Basic DimensionsActive PowercosrSP(2.1)Hijacking Speednknуу(2.2)where, уk— multiplication factor of hijacking speed80.1.....70.1уkfor Pelton turbine2.2.....60.1уkfor Francis turbine1.2уkfor Diagonal Kaplan turbine5.2.....1.2уkfor Axial Kaplan turbineRated Phase Voltage (Star connection)3LPVV(2.3)Rated Phase CurrentPrPVSI3(2.4)No. of Pole Pairnfp60(2.5)

Hydrogenerator basic design calculation PDF_1

8Leakage inductive reactance of stator winding (as a preliminary)125.0xe.m.f at rated loadPErlVkE(2.6)where, )sin2(1xxkE= coefficientRated CapacityrEрSkS(2.7)And then pole pitch)(, linear load )(A and magnetic flux density )(Bare previously selected by the value of pSr2 .Machine ConstantABkkCwBA12(2.8)Moment of inertia of the rotor2rJрSTJ(2.9)where, n2 = angular velocity of rotation465.2rJSTMinimum inner diameter of the stator coreArEJpСSkJD035.0min(2.10)where, 221.095.02kpJ = coefficient, depending on the rotorconstruction and number of field period75.122amphhhkMaximum inner diameter of the stator coreуnvDmaxmax(2.11)where, 120maxvm/sec at 5D m and 12p.145maxvm/sec at 5D m and 12pand alloy steel segmentrim.170maxvm/sec at 12.....6p.Optimum inner diameter of the stator core

Hydrogenerator basic design calculation PDF_2

93204lErAkSfCD(2.12)where, 6.20llThe inner diameter of the stator core )(D must be maxminDDD. IfmaxDDo, take maxDD. In contrast, if minDDo, take minDD. Buttake oDD, if maxminDDDo.Pole pitch at the selected inner diameter of the stator corepD2(2.13)Hijacking circumferential velocity at the outer surface of the rotor must notexceed the allowable values.maxvDnvуу(2.14)Length of the stator yoke21DkSClErA(2.15)The relative length of the stator magnetic circuit1ll(2.16)lmust be within the allowance value 1.5 to 4.0.2.2.Winding Type and Number of Stator SlotsFor machines with phase current 1000.....900sI A, especially at voltages6000LVV should be applied double-layer bar type winding, having very reliablecoil insulation. Double-layer coil type lap windings are used in smaller phase currents.If the number of slots per pole per phase q = 3 and a winding is usually performedwith integer number of slots per pole per phase; If a smaller q - with a fractionalnumber of slots per pole and phase.Double-layer bar type wave winding (usually a fractional number of slots perpole per phase) is mainly used in high-power multi-pole hydrogenerators (at15p,200nrpm), where they are more favorable to the lap windings by reducing thenumber and length of connections. Lap winding with fractional or integer of slots perpole per phase is applied in hydrogenerators (at 15pand 200nrpm) andcompensators.

Hydrogenerator basic design calculation PDF_3

10Number of consecutive turns of phase (as a preliminary)BlfkkVkwwBPE1114(2.17)Effective conductors in the slot21sufor double-layer bar winding;21su(even no:) for coil type lap winding;The number of parallel branchesIt must satisfy the inequality;max1min1min1maxпPппPпIIuaaIIua(2.18)Stator slot current111auIIsP(2.19)The number of slots per pole per phasepuwaqп1111(2.20)If 41q or 1q is %7...5 different from the nearest integer number of b, takebq1. If 41q, it must be selected fraction, i.e. dcbq1.The number of stator slots112pmqZ(2.21)The number of slots per segmentkcZZcc1(2.22)where,cc— the number of stator segments.k— integer number of segments laying in one layer of magnetic core.The number of stator segments is dependent on the inner diameter of stator.mD,-----------3D5.63D5.6Dcc-----------12, 4, 64, 6, 8The outer diameter of the stator core (as a preliminary)DDa(2.23)Large segment of the chord1ZZDHcac(2.24)The number of turns per phase1111apuqws(2.25)

Hydrogenerator basic design calculation PDF_4

11Pole pitchpZ21(2.26)Coil pitch83.0y(2.27)Stator winding coefficient111pywkkk(2.28)where,2sin1ykydcbddcbdkp6sin6sin1Magnetic flux density in air-gap at rated load (as the second approximation)1114wlfkkVkBwBPE(2.29)Linear LoadDIwAP16(2.30)2.3.Stator Slot DimensionsTooth pitch11ZDtz(2.31)Tooth width at the narrowest point11'32.1'zzzBBtb(2.32)Slot width'1zzsbtb(2.33)The recommendations for slot width are as follows:kVVL,-----------3.156.310.513.815.7cmbs,min.-----------1.21.62.12.42.6cmbs,max.-----------1.92.32.73.03.2Current density in the stator winding (as a preliminary)AA11(2.34)

Hydrogenerator basic design calculation PDF_5

12Cross-sectional area of the stator winding conductor for indirect cooling system (as apreliminary)111aIsP(2.35)Height of conductor bar eaFor reducing the additional losses due to skin effect effective conductor shouldbe broken down into insulated conductors with height 5.2eamm (at 50 Hz).Total width of the insulated conductors on the slot widthbbbinsus20(2.36)where,insu2= the total thickness of the insulation on the slot widthexcluding insulation of elementary conductors.Width of the elementary conductor barinsиeinsuinsuenbbb0(2.37)where,insи— insulation thickness of wire for two sidesen— the number of conductors on the slot widthSlot width (finally)bbbinsиinsиes222(2.38)The number of conductors in bareessc1(2.39)Cross-sectional area of the effective conductor of stator windingeescs1(2.40)Current density in the stator winding111saIP(2.41)Height of the elementary conductor bar with insulationinsиewaa(2.42)Width of the elementary conductor with insulationinsиewbb(2.43)Total height of insulated elementary conductors of one bar120ewcah(2.44)Slot height or tooth height of stator402hhhhhwedgehzs(2.45)where,swedgebh4.0— wedge height

Hydrogenerator basic design calculation PDF_6

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Results and Characteristics of Yeywa and Theoretical Designed Hydrogenerators

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Magnetic Circuits of AC Machines: Analysis and Derivations

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Hydrogenerator basic design calculation PDF

Hydrogenerator basic design calculation PDF

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Results and Characteristics of Yeywa and Theoretical Designed Hydrogeneratorslg...

Magnetic Circuits of AC Machines: Analysis and Derivationslg...

Results and Characteristics of Yeywa and Theoretical Designed Hydrogenerators

Magnetic Circuits of AC Machines: Analysis and Derivations