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Current pole inner distribution method for measuring tower grounding resistance

IOP Conference Series: Earth and Environmental Science 2020年第1期431卷

作者： Jun Guang Zhao Yu Ying Luo Jun Zhang Xin Gan Zhao Liu Zhan Long Zhang Zi Jian Dong State Grid Chongqing Electric Power Company Jiangjin Power Supply Branch Jiangjin Chongqing China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Shapingba Chongqing China

Three electrode method is a common method in measuring tower grounding resistance. However, its wiring distance is too long to complete accurate measurement in some terrain narrow areas, which is also an application problem to be solved urgently in the field of tower grounding resistance measurement. The traditional three electrode method is to find the compensation point between the grounding pole and the current pole. After calculation, there are also compensation points near the current pole besides the grounding pole and the current pole by using the traditional three electrode method. Based on this principle, the current pole is arranged between the grounding pole and the voltage pole by the current pole inner distribution method, which can greatly shorten the distance of the distribution pole. Through simulation analysis and test verification, the pole inner distribution method can control the pole distribution distance around 50m on the basis of ensuring the accuracy of the measurement results. Compared with the three-pole method, the pole distribution distance is shortened to 60%.

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The Influence of Bending Stress on the Sulfur Corrosion of Copper Winding

The Influence of Bending Stress on the Sulfur Corrosion of C...

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2018 IEEE CEIDP Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2018

作者： Chao, Wei Lu, Yuncai Jiang, Zhou Yuan, Yuan Youdong, Jiang Electric Power Research Institute of State Grid Jianzsu Power Grid Co. Ltd. Naniina China State Key Laboratory of Transmission and Distribution Equipments Power System Safety and New Technology Chongqing University Shapinaba District Chongqina China College of Materials Science and Engineering Chongqing University Shapingba District Chongqing China

ISBN: (纸本)9781538661925

In the operation of transformer, most copper winding is in bending state, and bending stress was a factor which could certainly influence the corrosion of copper winding. In this paper, copper winding was firstly bent with different angles. Then, the corrosion behaviors of the copper samples have been investigated in mineral oil containing various concentration of corrosive sulfur. The results show that bending stress did influence the sulfur corrosion. It will accelerate corrosion of copper winding. Moreover, the properties of insulating oil could be seriously affected. With the increasing of the bending angles, the copper presented increasing dielectric loss and reducing breakdown voltage. © 2018 IEEE.

关键词： Dielectric losses

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Numerical and experimental investigation of a ?-shaped air-cooled heat pipe radiator for cooling high power static Var generator 9

Numerical and experimental investigation of a ?-shaped air-c...

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9th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2018

作者： Cheng, Tao Qingjun, Huang Limei, Shen Dongfang, Sun Guanyu, Liu Zhenxiao, Chen Department of Refrigeration and Cryogenics Huazhong University of Science and Technology Luoyu Street Wuhan Hubei430074 China State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Corporation Disaster Prevention and Reduction Center Longhua Street Changsha Hunan410007 China

This paper proposes a O-shaped heat pipe radiator for cooling high power static var generator. The prototypes of typical and O-shaped heat pipe radiator are produced to validate heat transfer enhancement of the novel structure. Performance evaluation and analysis are numerically and experimentally carried out, and the numerical result agrees well with experimental data. Parametric studies are performed to analyze the effect of working condition on the heat dissipation capability of heat pipe radiator. The experiment results show that the maximum temperature of IGBT with 3500 W could be cooled down to 64 °C when the wind speed is 1.92 ms-1, 6°C lower than that of typical heat pipe radiator. It also finds that the O-shaped heat pipe radiator has a better performance when working at higher power and its performance is less affected by changes of heat load compared with typical heat pipe radiator due to the O structure. © ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning. All rights reserved.

关键词： Radiators

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Modified Minimum Approach Distance Formula for Five Working Used for 500kV Insulated Aerial Vehicles with Double Circuits on the Same Tower

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Journal of Physics: Conference Series 2020年第4期1550卷

作者： Chen Chao Ma Zhenyu Ge Leijiao Wen Binbin Xu Yipin Zhou Jinhui Electric Power Research Institute State Grid Zhejiang Power Company Ltd Hangzhou China Electric Power Research Institute State Grid Zhejiang Power Company Ltd Hangzhou Wuhan Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Wuhan Lide Electric Power Technology Co.Ltd Wuhan Wuhan

500kV double circuits on the same tower can effectively improve the natural transmission power and reduce the width of the line corridor, but the electromagnetic environment under the conductor is deteriorated. In order to ensure the safety of the workers in the insulated aerial vehicles and equipment during the live working, this paper firstly calculates the electric field distribution on the operating surface of the 500kV double-circuits truck with the actual line parameters, and then defines the distance coefficient. The existing minimum safe distance formula is modified, and a reference calculation method of the distance coefficient is given in combination with the data in the paper. Finally, the simulation data is used to verify.

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Research on Fault Diagnosis of power Transformer Equipment Based on KNN Algorithm

Research on Fault Diagnosis of Power Transformer Equipment B...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2017

作者： Yu, Huadong Wu, Qing Lu, Yongling Hu, Chengbo Wang, Yubo Liu, Guohua State Grid Information and Communication Industry Group Beijing100031 China State Grid Jiangsu Electric Power Company Research Institute Nanjing211103 China State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100192 China

ISBN: (纸本)9783319709895

power equipment is of great importance to the power of things, the operation of equipment directly impact on the safety and stability of the power of things. Therefore, it is important to ensure secure and stable operation of the power grid by prejudging monitoring, observing and fault diagnosis of power equipment. A fault diagnosis method of power equipment based on the technology of power internet of things and KNN algorithm is proposed in this paper. Through the real-time sensing and data acquisition of the basic equipment status in power network operation, the equipment status is analyzed and prejudged, which can provide alarm signals of the equipment to avoid greater security risk. © 2018, Springer International Publishing AG.

关键词： Failure analysis

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A new short-circuit calculation method of power system with photovoltaic power sources

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Journal of Physics: Conference Series 2020年第2期1601卷

作者： Gang Chen Jiafang Wu Yanhui Xiao Jiajia Hu Yunchao Chen Niancheng Zhou Ziyang Power Supply Company of State Grid Sichuan Electric Power Company Ziyang Sichuan 641300 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China

A large number of photovoltaic power sources connected to the grid will increase short-circuit current level of power system, and its fault transient process will change the fault characteristics of power grid. In this paper, the equivalent models of transient and steady state faults are obtained, by analysing the full current expression of photovoltaic power sources and its current characteristics in different fault stages. Based on the superposition theorem, the short-circuit current calculation method of power system with photovoltaic power sources is proposed. Finally, the effectiveness of the proposed method is verified by the analysis of actual power grid calculation examples, and the results can be used for power grid planning and relay protection setting.

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A method for evaluating the uncertainty of short-circuit current in power system with photovoltaic power generation

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IOP Conference Series: Earth and Environmental Science 2020年第2期546卷

作者： Jiafang Wu Gang Chen Yanhui Xiao Jiajia Hu Guoqiang Chen Weiyan Qian Niancheng Zhou Ziyang Power Supply Company of State Grid Sichuan Electric Power Company Ziyang Sichuan 641300 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China

Short-circuit current of power system with photovoltaic power generation is related to the fault current provided by the photovoltaic power supply. In this paper, based on the analysis of low voltage ride-through uncertain region of photovoltaic power generation, the random model of low voltage off-grid is constructed. Further combining with the system fault information, based on the monte carlo simulation, a probabilistic assessment method of short-circuit current in power system is proposed, which takes into account uncertainty of photovoltaic low voltage ride-through. Finally, an example is given to verify the proposed method. The method in this paper comprehensively considers the random factors of power grid failure and photovoltaic power generation low voltage off-grid, and the short-circuit current result can accurately reflect actual short-circuit current level of the system.

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A predictive control method for suppressing the continuous commutation failure of LCC-based HVDC systems

A predictive control method for suppressing the continuous c...

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8th Renewable power Generation Conference (RPG 2019)

作者： Jinxin Ouyang Zhen Zhang Chao Xiao State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Shapingba District Chongqing China State Grid Henan Electric Power Company Electric Power Research Institute No. 85 Songshan South Road Erqi District Zhengzhou City China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Unreasonable selection of control parameters of voltage dependent current order limiter (VDCOL) in the DC system may lead to further deterioration in recovery characteristics, causing continuous commutation failure. Firstly, by analyzing the relationship between VDCOL recovery slope, the AC bus voltage and the extinction angle, a method for changing the slope of VDCOL characteristic curve according to the AC bus voltage during faults is proposed. When the commutation failure occurs at DC grid, the VDCOL immediately sets the characteristic curve slope during system recovery according to the real-time measured commutation voltage and critical extinction angle value. This method can reduce the reactive power consumed by the converter which benefits to suppress the continuous commutation failure of the DC system to a certain extent. Finally, the CIGRE HVDC standard test model is built in PSCAD/EMTDC, and the effectiveness of the proposed recovery strategy in suppressing subsequent commutation failure and improving system recovery characteristics is verified. This method makes full use of HVDC system controller and does a great significance to improve the recovery performance of HVDC.

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Sensitive Information Protection of power IOT Based on Fuzzy Control Logic

Sensitive Information Protection of Power IOT Based on Fuzzy...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2017

作者： Wang, Zheng Wang, Yubo Lu, Yongling Xu, Changfu Pang, Zhenjiang Guo, Yan State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing100192 China Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing100192 China State Grid Jiangsu Electric Power Company Research Institute Nanjing211103 China

ISBN: (纸本)9783319659770

With the comprehensive construction of smart grid, Internet of Things technology has been widely applied to the power generation, transmission, scheduling and many other aspects. First, a framework for the information communication system of power Internet of things is proposed Second a method based on fuzzy logic is given to judge the sensitive information. Third, the way to deal with different information is shown according to the sensitivity of the data. The feasibility and correctness of the proposed framework and method are verified by tests. © 2018, Springer International Publishing AG.

关键词： Fuzzy control

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A Design of The Passive Micro Sensor for SF6 Detection

A Design of The Passive Micro Sensor for SF6 Detection

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lei Qiao Rui Liu Xin Chu Zhe Zheng Wenpeng Cui State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing China Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

Aiming to explore the passive micro sensor for SF6 detection, the proposed method is about designation and structure of SF6 detection micro sensor with high signal-to-noise ratio, miniaturization and passivity. advanced micro-machining technology is presented to sharply reduce the volume of the sensor, where the volume can be reduced by more than 50% compared with the existing sensor with discrete combination. The cost and volume reduction does not only make the new detection equipment possible, but the energy consumption of the whole system will also be greatly reduced. The application and promotion of the passive micro sensor in ring network cabinet, GIS, GIL and cable channel can bring considerable economic benefits.

关键词： Sulfur hexafluoride Absorption Optical fibers Optical fiber sensors

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