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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.


Liu D.,Baoding Tianwei Baobian Electrical Inc. | Zhang H.,Baoding Tianwei Baobian Electrical Inc. | Zhao L.,Baoding Tianwei Baobian Electrical Inc. | Zhang J.,Baoding Tianwei Baobian Electrical Inc. | And 3 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2011

According to the characteristics of 750kV transformer outlet device insulation structure, research of the technology was carried out. 2D and 3D engineering oriented simulated model of the key parts was established based on the Electro v6.2 and ElecNet 7.0 software to analyse the safe margin. The main technology problems such as definition of the electronic finite model, 2D and 3D electronic analysis of the outlet device, and optimize design of the insulated structure was introduced. The electronic field calculation of the 750kV outlet device and the analysis of the safe margin were studied. Insulation defect was avoid by the optimize design of the electrode and insulation structure. The 750kV outlet device proposed in this paper was applied to a lot of engineering projects; the reliability of the homemade 750kV outlet device was validated by the experiment and performance of many products.


Zhao L.,Baoding Tianwei Baobian Electrical Inc. | Zhang J.,Baoding Tianwei Baobian Electrical Inc. | Zhang H.,Baoding Tianwei Baobian Electrical Inc. | Liu D.,Baoding Tianwei Baobian Electrical Inc.
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

In order to research the effect of equalizing ball insulation structure EHV transformer on the electric field distribution of a transformer, 2D engineering oriented simulated model of transformer outlet device insulation system is established based on the Electro v6.2 software to analyse the safe margin. The influence tendency of distributor radius on electric field and safe margin is discussed. Consequently, the insulation structure of transformer equalizing ball is optimized and the electric performance and the safety of the transformer are improved. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


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.


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.


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.


Li L.,North China Electrical Power University | Ji F.,North China Electrical Power University | Li W.,Baoding Tianwei Baobian Electrical Inc. | Sun Y.,Baoding Tianwei Baobian Electrical Inc. | Liu G.,North China Electrical Power University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

Considering the anisotropic and nonlinear conductivity of oil-immersed paper in converter transformer's insulation, the FEM (finite element method) state equation was obtained by the penalty function method, and the equation was solved by Runge-Kutta method. The transient electric field was calculated of a practical converter transformer under polarity reversal test voltage, and the results showed the electric field of anisotropic nonlinear analysis was very different with that of isotropic linear analysis. Therefore, the anisotropic and nonlinear conductivity of oil-immersed paper should be taken into account for the accurate designing of insulation. © 2011 Chin. Soc. for Elec. Eng.


Guo M.,Baoding Tianwei Baobian Electrical Inc. | Mei G.,Guangdong Power Grid Corporation | Zhang X.,Baoding Tianwei Baobian Electrical Inc. | Liu D.,Baoding Tianwei Baobian Electrical Inc. | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2010

Based on a great deal of test data in single phase three limb power transformer model, the W-Bm curves related to different DC-biased levels are established in this paper. The 3D transient magnetic field under different DC-biased levels with no-load and load are simulated in MAGNET. The loss and loss density of components in transformer are analyzed. The experimental results are in accordance with the simulation results, confirming the validity of the proposed losses calculation method for transformer under DC-biasing.


Liu G.,North China Electrical Power University | Li L.,North China Electrical Power University | Li W.,Baoding Tianwei Baobian Electrical Inc. | Li B.,China Electric Power Research Institute | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2012

The conductivity of insulation oil and paper of the converter transformer is influenced by electric field strength, temperature and pressure etc. In order to study the influence of electric dependent conductivity on electric field distributions, the nonlinear characteristics between electric field strength and conductivity of the oil is fitted by an exponential curve. Using the new nonlinear curve, the transient nonlinear electric field of a ±500 kV converter transformer under PR (polarity reversal) voltage is calculated by the C-N (Crank-Nicolson) method .The numerical results under linear and nonlinear conditions show that, when we consider the 1 minutes duration of the PR process, the linear maximum electric field strengths at the end of the ramp voltage of the PR are almost equal to the results under the step voltage, while the nonlinear maximum electric field strengths at the end of the ramp voltage of the PR are about 50 percent less than the results under the step voltage. The phenomena of the less value under the nonlinear condition are explained by the acceleration of the space charges under the electric dependent conductivity.


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

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