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Tao X.,CSG EHV Transmission Company | Wu T.,China Electric Power Research Institute
ICHVE 2016 - 2016 IEEE International Conference on High Voltage Engineering and Application | Year: 2016

UHV DC transmission lines with the advantages of high electric power transmission capacity and long transmission distance have been successfully applied in China, of which operation security and reliability is of great importance to the power grid. Line corridors and channel operation, maintenance and patrol task is important to ensure the reliability of UHV DC transmission lines. Aiming at UHV DC transmission lines clearance distance measurement difficulties, such as large measurement error problem, unmanned aerial vehicle (UAV) for aerial photography was applied in this article, and with the help of the professional 3D graphics image processing software to generate to rapid, completed digital elevation model and digital orthogonal projection. To realize digital 3D effect real display for transmission lines, a custom software development was applied, by which transmission operation managers simply clicked objects to complete the automatically the minimum clearance distance check calculation for conductors of UHV transmission lines. The minimum clearance distance management system can effectively solve the clearance measure problems to enhance the complex transmission channel measurements and operation management, which is benefit for the construction the smart transmission lines. © 2016 IEEE.


Chen S.,Kunming University of Science and Technology | Zhang J.,CSG EHV Transmission Company | Liu H.,Kunming University of Science and Technology | Xie J.,Kunming University of Science and Technology | Hou Y.,CSG EHV Transmission Company
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

A single-ended current direction transient protection of UHVDC transmission line is put forward. Fault current signal outside the region is obviously different in mutation direction from the one at the opposite side. So the direction where the fault signal comes from can be judged. UHVDC boundary and transmission line have attenuation to fault current. If the fault signal comes from the opposite internal, with HHT the instantaneous frequency of IMF1 is calculated. Then, from the maximum value of instantaneous frequency, whether the fault is from the opposite internal or external fault can be judged. A transient current protection scheme of UHVDC transmission line is given. The simulation results of PSCAD verify the protection scheme. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Xie J.W.,Kunming University of Science and Technology | Bi G.H.,Kunming University of Science and Technology | Chen S.L.,Kunming University of Science and Technology | Zhang J.,CSG EHV Transmission Company
Advanced Materials Research | Year: 2014

The method to discriminate the fault within or beyond the protective zone according to the signals with high frequency detected in protection has problem with low reliability when the resistance of earth fault is high. The transient voltage with low frequency detected in protection can reflect the size of fault intensity approximately, and the transient voltage with high frequency detected in protection in internal fault is bigger than that in external fault when the size of fault intensity is same. The high frequency transient voltage and low frequency transient voltage detected in protection are chosen as inputs and fault section as outputs for training and testing the neural network for fault identification in the UHVDC transmission line, fault section can be identified when input fault characteristic data to the trained model. A variety of transmission line earth fault situation are simulated by PSCAD, and this earth fault section identification method based ANN shows satisfactory performance, even the fault resistance is high. © (2014) Trans Tech Publications, Switzerland.


Chen B.,CSG EHV Transmission Company | Zhang Q.,CSG EHV Transmission Company
Gaoya Dianqi/High Voltage Apparatus | Year: 2016

The purposes of reactive power control for UHVDC transmission project are to meet DC converter station's reactive power demand, filter harmonics at AC side, and keep AC side bus voltage stable. The ±800 kV Pu'er converter station is in the Yun-Guang II UHVDC transmission project, however a flaw exists in voltage effectiveness selection logic of the reactive power control function of its DC station control system. This paper proposes optimization measures to eliminate this flaw, thus to benefit reliable operation of UHVDC transmission projects. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.


Cao J.,CSG EHV Transmission Company | Chen T.,CSG EHV Transmission Company | Jiang Z.,Wuhan University | Wen X.,Wuhan University | Zhang M.,Beijing Power Equipment Group
2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014 | Year: 2015

As dry-type smoothing reactor is a crucial equipment of high voltage direct current transmission project, temperature monitoring is an effective means of inspecting its stable operation. According to computational fluid dynamics and heat transfer theory, steady state calculation of coupling fluid and thermal field for dry-type smoothing is done in the work. By simplifying the computational model of dry-type smoothing reactor reasonably, finite volume method is employed to solve the fluid and temperature fields of 1/4 circumferential region directly, and the distribution characteristics of the reactor temperature field is obtained. Then the axial and radial temperature distributions of encapsulation are researched separately. Finally, the accuracy of the simulation is verified by comparing the computational values with experimental values, the primary area of monitoring encapsulation temperature is proposed. © 2014 IEEE.


Chen T.,CSG EHV Transmission Company | Cao J.,CSG EHV Transmission Company | Zhou G.,Wuhan University | Zhipeng J.,Wuhan University | And 2 more authors.
2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014 | Year: 2015

Based on the basic structure characteristics and site layout of ±800kV dry-type smoothing reactor in a converter station, a 3D electrical field calculation model is established in this paper. With the finite element software, the paper studies the electric field distribution in 1.5m plane over ground and in the longitudinal plane of the reactor, and the electric field values in the surface of main buses and grading rings. From the results, it can be concluded that the maximum electric field strength appears outside surface of the grading ring under the middle bus, and the electric field values are all less than 30kV/m in the area which is more than 10m away from the center of the reactor in 1.5m plane over ground. © 2014 IEEE.


Zhang P.,Dali Bureau | Li H.,CSG EHV Transmission Company
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

A transmission line fault in its unipolar metallic return mode has happened, leading to blocking converter in ±800 kV Puer-Qiaoxiang UHVDC system. This paper analyzes the fault in detail, and points out that the breakdown arrester in the neutral bus is the reason that causes neutral bus differential protection and polar differential protection action. In addition, part of DC protection design is imperfect. The optimization measures for corresponding DC protection are given. Practice has proved that the proposed measures effectively improve the reliability of the HVDC system operation. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved.


Zhang Q.,CSG EHV Transmission Company | Liang D.,CSG EHV Transmission Company | Liu N.,CSG EHV Transmission Company
Gaoya Dianqi/High Voltage Apparatus | Year: 2015

The ±800 kV Pu'er converter station is in the Yun-Guang II UHVDC transmission project. In this paper, the reactive configuration of the converter station is analyzed, and a scheme of the converter station reactive power compensation equipment capacity and grouping configuration is proposed according to the reactive power demand characteristics and the AC system. Calculation based on the reactive configuration verifies the feasibility of the proposed reactive configuration. ©, 2015, Gaoya Dianqi/High Voltage Apparatus. All right reserved.


Jiang Z.,Hubei Engineering University | Wen X.,Hubei Engineering University | Wang Y.,Hubei Engineering University | Chen R.,Hubei Engineering University | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

To research the distribution characteristics of temperature rise for UHV dry-type air-core smoothing reactor, according to computational fluid dynamics and heat transfer theory, this paper presented the mathematical model of temperature field coupling steady fluid and solid for the reactor. The finite volume method was employed to solve the steady flow and temperature fields of 3D model directly, and the temperature distribution characteristics of the reactor were obtained. Then the axial and radial temperature distributions of encapsulations were studied separately. Finally, optical fiber temperature measurement method was used to test temperature rise for the reactor under natural convection condition. Comparative analysis shows that the calculated results are in good agreement with the experiment, which verifies the rationality and accuracy of the temperature field numerical calculation. And it can provide references for the temperature rise monitoring of UHV dry-type air-core smoothing reactor. © 2015 Chinese Society for Electrical Engineering.

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