Fengcheng, China
Fengcheng, China

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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.


Wang S.-J.,China XD Group | Chen X.-F.,Changzhou XD Transformer Co. | Meng L.-K.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

EHV outlet is an important part of EHV transformer, whose insulation structure directly affects the overall performance of transformer and its manufacturing cost, production cycle, assembly process and other aspects. According to the electric field calculation, new type of barrier system can meet the demand of various test and operating conditions, so as to ensure the electric property, reduce manufacturing cost, shorten production cycle and make assembly simple.


Deng Y.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

Drying treatment of self-bonding transposed conductor exerts significant influence on the insulation performance and short-circuit resistance capability of transformers. However, conventional drying treatment process does not distinguish different types of windings. The author lists diverse drying treatment processes for different windings by comparing the drying treatment processes and parameter requirements of two distinct windings in order to help manufactures select right drying treatment processes.


Deng Y.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

The insulation structure of converter transformer is its core technology, and it relates to the safety operation of converter transformer and DC transmission system. The special operation condition of converter transformer in DC system determine its main insulation and the valve side barrier system will withstand the voltage which is different from the AC transformer. This paper firstly presents the voltage withstood by insulation structure of converter transformer and then analyzes the voltage distribution in the insulation structure as well as the coordination of insulation material under different voltages. With the development and application of technology for UHV DC transmission, the insulation structure of converter transformer shall meet the electric, mechanical and thermal requirements, so the research of AC and DC combination electric field are the key of converter transformer.


Jiang Z.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

Reliability of DC barrier system is one of key points of converter transformer's R&D. DC barrier systems are imported over the years. Optimization of insulation structure of barrier system has significant influence on further speeding up localization manufacture of converter transformer in China. The operation characteristic of converter transformer was summarized, and the insulation structure of barrier system was studied. Furthermore, the calculation of electric field of insulation structure for DC barrier system was made. Converter transformer has features as high short circuit impedance, DC bias current influence, serious influence of harmonic and complicated insulation structure. Electric field analysis and calculation was carried on the basis of typical insulation structure of DC barrier system for different models under different testing condition, such as long duration AC applied voltage withstand test, DC voltage withstand test with PD measurement and polarity reversal test to summarize design concept and main points to structure of DC barrier system. Test results show that the developed insulation structure of DC barrier system is reasonable, which has been approved by the test. The same theory and method will be applied to insulation structure electric field analysis of DC barrier system of converter transformer with higher voltage level to optimize the sound insulation structure of DC barrier system.


Wang F.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

Due to the working feature of arc furnace transformer that the secondary voltage of large current, the problems of temperature rise and leakage flux field of transformer become extraordinary extrusive. By analyzing the influence of different materials of tank wall and the separate space of electrical conductor at tank wall of secondary side on the distribution of leakage flux field and temperature field, this paper settles down the appropriate material of tank wall and suitable exit structure. By comparing and analyzing the magnetic inducting intensity of wall with various materials of tank wall of secondary side, it is concluded that the adopting of stainless steel plate for the secondary side of arc furnace transformer with large capacity and large current, together with "triangle" shape arrangement for exit copper row is reasonable and effective. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


A coupled electromagnetic circuit method for converter transformer was proposed. The magnet circuit based on the topological structure and the saturation characteristics of core is established. The circuit-magnetic circuit model is achieved by coupling the magnet circuit with the circuit equation of primary side and secondary side of converter transformer. The research method is applied to a finite element model of a converter transformer and the exciting current of normal working condition and under DC bias is calculated together with the loss of structural component. The result shows the exciting current and loss can be predicted and analyzed accurately using this method. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


Zhao Y.,Xian XD Transformer Co. | Xie Q.,Xian XD Transformer Co. | Zhang L.,Xian XD Transformer Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

The split transformer can limit the short circuit current at LV side efficiently, so this LV split type transformer is widely applied to starting-up standby transformer in power station. In order to ensure the reliability of the insulation structure in 500 kV radial split transformer, FEM is used to analyze the electric field distribution of end insulation in HV winding, lead insulation and outlets insulation of HV winding. The insulation structure optimization of key parts in transformer is done. The static ring structure of the high voltage winding is changed to composite insulation structure, and the shielding structure on the edge of the spring-loaded device corners of HV lead insulation is improved. All these measures make the main insulation structure of split transformer meet the margin requirements. The results in this paper can provide a theoretical basis for operational reliability analysis, and provide references for the insulation design of split transformer above 500 kV voltage level. © 2016, Xi'an High Voltage Apparatus Research Institute. All right reserved.


Mi C.-L.,Xian XD Transformer Co. | Xie Q.-F.,Xian XD Transformer Co. | Meng L.-K.,Xian XD Transformer Co. | Han X.-D.,Xian XD Transformer Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2010

The high voltage exits insulation structure is an important part of the extra-high voltage (EHV) and ultra-high voltage (UHV) transformer major insulation structure. Based on the exits insulation structure of existing large transformer, computation and analysis were performed to the electrical field by means of the finite element method, and the optimized design results and practical engineering application were shown in examples. The R&D process was discussed for the barrier systems used in the 1700 kV, 750 kV and 500 kV transformers in China. The feasibility of the localization production of barrier system of EHV and UHV transformer, as well as its developing trend in the future, was analyzed.


Zhao L.,XIAN XD TRANSFORMER Co. | Yang W.,XIAN XD TRANSFORMER Co.
China International Conference on Electricity Distribution, CICED | Year: 2012

This paper carries out a system research on the intelligent transformer under the condition of intelligent power grid. Secondary system acts as nervous system to control and monitor the substation. The reasonableness and reliability of secondary circuit and secondary lead directly relate to the safe and reliable operation of the intelligent transformer and intelligent power grid. This paper discusses the standards and specifications of secondary lead with intelligent transformer. The industry standards and specifications of secondary lead with intelligent transformer shall be established because the intelligentized transformer raises higher requirements for the technological innovation of secondary lead and has greater effect on it. Through establishing the technical documents of secondary lead with intelligent transformer, it will provide reference for the technological improvement and standards of secondary lead with transformer products, which is helpful for the industrial production of intelligentized transformer. © 2012 IEEE.

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