Entity

Time filter

Source Type

Changzhou, China

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. Source


Zhang L.,Xian Jiaotong University | Chen M.,Xian Jiaotong University | Peng Z.,Xian Jiaotong University | Xie Q.,Changzhou XD Transformer Co. | Gong Y.,Changzhou XD Transformer Co.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2014

An algorithm for calculating no-load losses of large single-phase transformer core with step-lap joints was proposed. Equivalent magnetic property method was employed to obtain the equivalent material properties of joints. A cycle was divided according to the equal time interval, and then the static magnetic flux density distribution was calculated at each instant moment. Spline-interpolated method was chosen to draw up the temporal curve of magnetic flux density. FFT analysis was used to determine the each harmonic amplitude of magnetic flux density. The losses were evaluated by linear interpolation from loss curves with corresponding frequency, and the total transformer core loss was gotten by summing losses of all elements. A large single-phase transformer used in practical project was taken as the object, and the proposed algorithm and the traditional scheme without considering joint structure were used to calculate no-load losses. The comparison with the result of no-load transformer test shows that the result from the proposed algorithm gets closer to the test data, which enables to improve the accuracy by 9.8% in the rated voltage range of 50% to 100%. Source


Zhang L.,Xian Jiaotong University | Chen M.,Xian Jiaotong University | Peng Z.,Xian Jiaotong University | Xie Q.,Changzhou XD Transformer Co. | Gong Y.,Changzhou XD Transformer Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

A ultra high voltage (UHV) converter transformer was taken as the research object, whose type was ZZDFPZ-340800/500-800. Time-domain analysis and frequency-domain analysis were used to calculate the losses of converter transformer windings subject to non-sinusoidal load current, and obtained the detailed distribution of windings losses. Result comparison between two different methods has been done, and it could be found that frequency-domain analysis method was much more suitable for practical design. In order to overcome the shortcomings of GB/T 18494.2-2007 and IEC-61378 which ignored the effect of different skin depth on eddy losses of windings under the different frequencies, a harmonic losses factor was introduced to correct the losses, and to get a more accurate result. Using the corrected result to form a basis guarantee for the purpose of losses evaluation can reduce the manufacturing cost of the converter transformer. © 2014 Chin. Soc. for Elec. Eng. Source

Discover hidden collaborations