TBEA Shenyang Transformer Co.

Shenyang, China

TBEA Shenyang Transformer Co.

Shenyang, China
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Ma G.,Tongji University | Zhu R.,CAS Institute of Electrical Engineering | Xie Q.,Tongji University | He C.,Tongji University | Xin Z.,TBEA Shenyang Transformer Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2017

In order to solve serious damages of large-scale transformers in recent earthquakes, shaking table test on a base-isolated transformer-bushing system was conducted using a hybrid isolation system. Base isolation design and arrangement for the transformer-bushing system were implemented by the hybrid isolation system consisted of laminated rubber bearings and sliding bearings. Moreover, shaking table test on the base-isolated transformer-bushing system to white noise and Wolong, Qingping, Zengjia ground motions recorded in the great Wenchuan earthquake was conducted. Dynamic properties and earthquake responses of the system were measured. Meanwhile, the seismic responses of the base-isolated transformer-bushing were compared and analyzed with the non-isolated system. The results show that acceleration and strain responses of the base-isolated transformer-bushing system can significantly be reduced to less than 1/2 of those of the non-isolated system. Relative displacement responses of the base-isolated system to the table will increase to some extent, however, acceleration of 0.4g table motion is within 60 mm when the system to the peak. The hybrid base-isolation system can reduce ground motions transferring to the transformer-bushing system, filter out high frequency components of the earthquake motions, prevent quasi-resonance between transformer-bushing system and earthquake motions, and mitigate earthquake responses of the transformer-bushing system. The tests validate the effectiveness of the hybrid base-isolation system for a transformer-bushing system, therefore, the hybrid system base-isolated transformer can meet the design demands of lowering one-degreee earthquake fortification intensity. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Guangfan L.,China Electric Power Research Institute | Bo L.,China Electric Power Research Institute | Jingzhong L.,China Electric Power Research Institute | Zhigang Z.,China Electric Power Research Institute | And 4 more authors.
European Transactions on Electrical Power | Year: 2012

SUMMARY The Jingdongnan-Nanyang-Jingmen UHV AC Pilot Project has already been put into service in China. In this paper, insulation level of power transformer and shunt reactor for 1000-kV power transmission project in China are introduced. UHV AC transformer and shunt reactor structures are given. Key technologies, including cooling type, regulating method for UHV AC transformer, pattern of outgoing line, and noise controlling, are discussed. Besides, due to the high voltage class, high capacity, and super size of UHV power transformer, the size of its test circuit is correspondingly enlarged, the impacts of stray inductance and capacitance will be more intense consequentially, thus in factory test including lighting impulse test, switching impulse voltage test, short-duration induced AC voltage test at 500-kV side, and long-duration induced AC voltage test with partial discharge measurement are presented. Copyright © 2011 John Wiley & Sons, Ltd.

Xie Q.,Tongji University | Ma G.,Tongji University | Zhu R.,CAS Institute of Electrical Engineering | Qiu N.,State Grid Corporation of China | Xin Z.,TBEA Shenyang Transformer Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

Transformers are essential substation equipment, while they suffered from various damages in earthquakes. Two 220 kV porcelain bushings and transformer tank which constituted a transformer-bushing system were utilized as the test object, shaking table tests were carried out on the system. Seismic responses at key positions of the system under excitations of earthquake ground motions, which satisfy IEEE 693 required response spectra excitation, were measured. Take the system earthquake responses under El Centro earthquake record excitation for example, acceleration and displacement responses along the height of the system were analyzed, finally earthquake response mechanisms of the transformer turret and bushing were analyzed. Fundamental dynamic characteristics of the system were acquired, and cushion slippage and oil leakage at bushing flange were observed under earthquake record with peak ground acceleration (PGA) of 0.3 g excitation. Analyses indicate: when the bending stiffness of the bushing flange is large enough, the out-of-plane flexibility of transformer tank walls magnifies dynamic responses of the bushings and contributes to turret rocking vibration. There is a significant coupling interaction between bushing vibration and turret rocking vibration, and turret and bushings as a whole rock around turret bottom flange. However, when the bending stiffness of the bushing flange turned smaller, bushings rock around its flange alone, the coupling interaction between bushing vibration and turret rocking vibration became weak. © 2015 Chinese Society for Electrical Engineering.

Zhang S.,Shenyang University of Technology | Sun M.,Shenyang University of Technology | Tang L.,Shenyang University of Technology | Hu F.,Shenyang University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2012

The thermal aging experiments on nitrile rubber (NBR) and modified NBR were carried out in 25 # transformer oil. Both of the content of CH 4, microstructure, morphology and mechanics characterization was analyzed by Gas Chromatography (GC), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Servo Control material testing machine, respectively. The results shows that the amount of CH 4 released from the modified NBR is less than original NBR, and the mechanics characterization of the modified NBR is also satisfied with the application requirements. © (2012) Trans Tech Publications, Switzerland.

Hu F.,Shenyang University of Technology | Hu F.,Avic Shenyang Aircraft Corporation | Tang L.,Shenyang University of Technology | Zhang S.,Shenyang University of Technology | And 3 more authors.
Advanced Materials Research | Year: 2013

The formation of CH4 from two kinds of NBR with different raw rubber applied in transformer oil were investigated. In this study, work environment of transformer was simulated, thermal aging tests were conducted for different times in 70°C transformer oil. Surface morphology, the release of CH4, and molecular structure were analyzed by using Gas Chromatography (GC), Scanning Electron Microscope (SEM),and Fourier Transform Infrared analysis (FTIR), respectively. In addition, the swelling property was also discussed in this work. The results illustrated that raw rubber with more content of acrylonitrile had excellent advantages in heat oil aging resistance and the formation of CH4. © (2013) Trans Tech Publications, Switzerland.

Hu F.,Shenyang University of Technology | Tang L.-W.,Shenyang University of Technology | Tang L.-W.,TBEA Shenyang Transformer Co. | Zhang S.,Shenyang University of Technology | And 3 more authors.
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2014

The nitrile butadiene rubber (NBR) in oil immersed transformer will produce CH4. Therefore, the work environment of NBR in oil immersed transformer was simulated, and the thermal oil aging tests with different time on NBR was conducted to investigate the production mechanism of CH4. The microstructure change, CH4 production condition and molecular chain structure for NBR in the transformer oil after thermal oil aging were studied with scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and gas chromatography (GC). The results show that the microstructure of NBR is horribly damaged after thermal oil aging. An anti-ager RD, namely poly (1, 2-dihydro-2, 2, 4-trimethyl-quinoline) added in NBR, is mainly responsible for the production of CH4. The methyl group in the molecular structure of RD easily breaks down and reacts with hydrogen radical to produce CH4 during thermal oil aging. Without using the RD, the production of CH4 in NBR can be effectively controlled.

Xie D.,Shenyang University of Technology | Zhu Z.,TBEA Shenyang Transformer Co. | Wu D.,Shenyang University of Technology | Wang J.,TBEA Shenyang Transformer Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

The accurate computation of the distribution of eddy current field and the losses due to its induction in conducting materials is very important for the optimal design and safe operation of electrical equipments. However, till now in the finite element analysis of the engineering eddy current fields in electrical devices, such as the electrical machines and transformers, there are the problems e. g. the huge scale of computation, too long computing time and poor precision which could not meet the demand of engineering accuracy yet. The current research situation and difficulty of these problems were analyzed mainly from the aspect of computation methodology. The methods to deal with these problems, e. g., homogenization models of the laminated iron core, conventional and improved; the sub-problem perturbation finite element method; the domain decomposition method; and the element-level parallel finite element method were described. Their advantages and limitations were discussed, and the authors' suggestions for the further research strategies were also included as the reference for carrying out three dimensional engineering eddy current field calculation with large scale fast and effectively. ©2015 Chin.Soc.for Elec.Eng.

Geng Z.,Shenyang University of Technology | Lin X.,Shenyang University of Technology | Si B.,TBEA Shenyang Transformer Co.
2013 2nd International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2013 | Year: 2013

Fourier transform are used on the very fast transient overvoltage (VFTO) discretion, different spectral components of transient voltage waveform are achieved. The mathematical model of the transient electric field is deduced considering dielectric polarization loss and displacement current. FEM is adopted to calculate the transient electric field of gas insulated switchgear disk insulator under the condition of VFTO, potential distribution curves at key point time are shown, which are compared with the one in the quiescent state. The tangential electric field strength and normal electric field strength along with radial direction on the insulator surface are illustrated. Some effects of typical positions electric field strength along with time are shown in this paper. The references for GIS insulation design are provided. © 2013 IEEE.

Xing J.,TBEA Shenyang Transformer Co. | An Z.,TBEA Shenyang Transformer Co. | Chen L.,Shenyang University of Technology
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

To restrict over-voltage and compensate line charging power, it is necessary to install high compensation shunt reactors on ultra-high voltage AC transmission lines. Due to the saturation characteristic of the core during working process, the magnetically controlled shunt reactor(MCSR)contains higher-order harmonics in its high voltage windings. In this paper, the 500 kV MCSR demonstration project is taken as an example, and a finite element-based field-circuit coupling method is proposed to analyze the controlling characteristic of the high voltage winding. The amplitude and frequency of the harmonic in the current of the high voltage winding are calculated with this method. The calculated results are compared with the measured ones of the 500 kV MCSR in Jiangling Converter Station to verify the validity of the proposed method. In addition, the excitation curve and the harmonic current of a 750 kV MCSR are calculated with the proposed method, and the results agree with the measured data. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved.

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