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Yang G.,North China Electrical Power University | Li L.,North China Electrical Power University | Zhang X.,Baoding Tianwei Baobian Electrical Inc.
IEEE Transactions on Applied Superconductivity | Year: 2016

To study the electromagnetic characteristics of the controlled shunt reactor (CSR) of transformer type for bidirectional reactive power compensation, an improved coupled magnetic circuit and electric circuit method is proposed. A 220-V single-phase CSR of transformer type is developed for experimental analysis. Instantaneous currents of windings, magnetic flux of the iron core, and inner leakage fluxes of windings are calculated at the capacitive and inductive reactive power modes of the CSR by the proposed method. Calculated results are consistent with experimental results. Instantaneous electromagnetic characteristics of the CSR are analyzed. © 2016 IEEE. Source


Yang G.,North China Electrical Power University | Li L.,North China Electrical Power University | Le Zhang X.,Baoding Tianwei Baobian Electrical Inc.
2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2015 - Proceedings | Year: 2015

In this paper, the electric circuit model and the magnetic circuit model of two different configurations of three-phase controlled shunt reactors (CSRs) of thyristor controlled transformer (TCT) are presented. Numerical analysis of the coupled models is made in time domain. Calculated results of two different configurations of three-phase CSRs of TCT type are compared with each other. © 2015 IEEE. Source


Zhang Y.-B.,State Grid Corporation of China | Zheng J.,State Grid Corporation of China | Wang D.-H.,Xian XD Transformer Co. | Li W.-P.,Baoding Tianwei Baobian Electrical Inc.
Gaodianya Jishu/High Voltage Engineering | Year: 2010

The basic structure for converter transformers of Xiangjiaba-Shanghai project is single-phase, double-winding, on-load tap changer and oil-immersed. Compared with converter transformers in ±500 kV HVDC projects, withstand voltages of valve windings are higher. It is difficult to select insulation material to regulate the DC and AC voltage distribution. Furthermore, the coordination between insulation structure, the reasonable electric field strength on the interfaces of oil and insulation pressboards and transportation limits shall be more important in the design of converter transformer. As for the barrel system arrangement of valve windings, it is related to the transportation limits and assembly work on site. The internal barrel system structure of valve windings for converter transformers of Xiangjiaba-Shanghai project is selected. The DC bias current control also is crucial in converter transformers' design. In Xiangjiaba-Shanghai project, the requirement for DC bias current is as much as 15 A per converter transformer, so the margin of magnetic intensity shall be enough in core structure design. As the acceptance required, the type/routine test is specified and also the corresponding coition is based on the IEC standards and special requirements of Xiangjiaba-Shanghai project. Compared with converter transformers in ±500 kV HVDC projects, test voltages of the DC applied voltage withstand test, polarity reverse test and applied AC voltage withstand are much higher. Source


Trademark
Baoding Tianwei Baobian Electrical Inc. | Date: 2014-11-21

Transformers (electricity); Relays, electric; Mutual inductors; Electricity switchboard, high/low voltage; Distribution consoles (electricity); Distribution boxes (electricity); Control panels (electricity); Materials for electricity mains (wires, cables); Magnetic wires; Wires, electric; Reactors; Monocrystalline silicon; Polycrystalline silicon; Solar batteries. Construction information; Repair information; Construction progress check; Construction; Factory construction; Electric appliance installation and repair; Machinery installation, maintenance and repair; Rebuilding machines that have been worn or partially destroyed; Repair of power lines; Upholstery repair.


Liu G.,North China Electrical Power University | Li L.,North China Electrical Power University | Zhao X.,North China Electrical Power University | Li W.,Baoding Tianwei Baobian Electrical Inc. | And 4 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The fixed point method is adopted to analyze the nonlinear electric field under the AC-DC hybrid voltage, which contains many high order harmonics, and the formula of selecting fixed-point conductivity was proposed. For the stiffness matrix is independent of the current iteration's solution, the finite element method (FEM) in frequency domain can be used to obtain the steady periodic results effectively. To verify the proposed algorithm, a typical oil-paper insulation structure of converter transformer under the superimposed AC-DC voltage was calculated by different methods and the results show that the proposed method is suitable to analyze the nonlinear electric fields under AC-DC hybrid voltage of actual converter transformer and other periodic non-sinusoidal electric problems. © 2012 Chin. Soc. for Elec. Eng. Source

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