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Xin Peng,Liu Yadan,Tao Dajun,Zhao Hongsen 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
In order to research the variation characteristics and infl uencing factors of the rotor surface eddy current loss during the nuclear power half-speed turbo-generator asymmetric operation, the harmonics characteristics of eddy current generated by stator negative sequence current on the rotor surface are derived by analytical method, and the harmonic characteristics of excitation current generated by stator negative sequence current on excitation winding are derived. On the basis, the harmonic current characteristics of stator winding caused by the harmonic component of excitation current are derived. Furthermore, the eddy current characteristics on the rotor surface caused by the harmonic current in the stator current are derived. At the same time, the infl uence factors and distribution characteristics of eddy current and eddy current loss of rotor damping strip and slot wedge are given. On this basis, taking a 1407MVA nuclear power half-speed turbo-generator as an example, the fi eld-circuit coupled model is established. The normal and asymmetrical operation of the generator is simulated. Through the comparison and analysis between simulation results and theoretical derivation results, the correctness of theoretical derivation is verifi ed. A theoretical reference for researching mechanism and infl uencing factors of rotor surface loss during nuclear power half-speed turbo-generator asymmetrical operation is proved.
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Zhihang Peng,Qiang Chen,Dan Liu,Yadan Wang,Dinquan Xiao,Jian-guo Zhu 한국물리학회 2013 Current Applied Physics Vol.13 No.7
Aurivillius type (NaBi)0.5x(LiCe)xBi2Nb2O9 ceramics were prepared by the standard ceramics route. The single crystal structural ceramics were achieved for all compositions and lattice distortion was decreased by (LiCe) dopants. The temperature dependent dielectric properties revealed that all compositions possess a high Curie-temperature (>780 ℃). A modified CurieeWeiss relationship is used to study the diffuseness behavior of a ferroelectric phase transition indicating the degree of diffuseness of NBN-based ceramics increased with (LiCe) modifications. The degradation of resistance implied a plausible model that Ce4þ ions entered into the B-site of the pseudo-perovskite structure and acted as acceptor doping. Further investigation demonstrated that both electrical conduction and dielectric relaxation processes were associated with the oxygen vacancies produced by the substitution of Nb5+ ions by the Ce4+ ions.
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