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公开(公告)号：US10605852B2
公开(公告)日：2020-03-31
申请号：US15781079
申请日：2016-06-30
Applicant: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED , STATE GRID CORPORATION OF CHINA , CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA
Inventor： Dingxiang Du , Huanzhang Liu , Zexin Zhou , Xuming Liang , Yarong Guo , Xingguo Wang , Lianhai Li , Delin Wang , Xiao Li , Xiangwen Chen
Abstract: A concomitant impedance protection method for a half-wavelength power transmission line includes that: three-phase currents and three-phase voltages of a relay protection device mounting position at an M side and a relay protection device mounting position at an N side of the half-wavelength power transmission line are acquired respectively; it is judged whether starting amounts of an M side and an N side meet starting conditions or not; a failure point F is determined according to a time difference when the starting amounts of the M side and the N side meet the starting conditions; and a relay protection action of the half-wavelength power transmission line is started according to concomitant impedance of the half-wavelength power transmission line. According to the method, a failure may be located by a time-difference method according to a characteristic of the failure, by compensating the voltages and currents on two sides of the line to construct concomitant impedance, and failures in the region of line can be correctly reflected. Since concomitant impedance protection effectively utilizes two-terminal electrical information, the fault can be quickly and reliably operated in the line region, misoperation on the failures out of the line region can be avoided, and the protection has relatively higher sensitivity.
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公开(公告)号：US20180364292A1
公开(公告)日：2018-12-20
申请号：US15781079
申请日：2016-06-30
Applicant: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED , STATE GRID CORPORATION OF CHINA , CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA
Inventor： Dingxiang Du , Huanzhang Liu , Zexin Zhou , Xuming Liang , Yarong Guo , Xingguo Wang , Lianhai Li , Delin Wang , Xiao Li , Xiangwen Chen
Abstract: A concomitant impedance protection method for a half-wavelength power transmission line includes that: three-phase currents and three-phase voltages of a relay protection device mounting position at an M side and a relay protection device mounting position at an N side of the half-wavelength power transmission line are acquired respectively; it is judged whether starting amounts of an M side and an N side meet starting conditions or not; a failure point F is determined according to a time difference when the starting amounts of the M side and the N side meet the starting conditions; and a relay protection action of the half-wavelength power transmission line is started according to concomitant impedance of the half-wavelength power transmission line. According to the method, a failure may be located by a time-difference method according to a characteristic of the failure, by compensating the voltages and currents on two sides of the line to construct concomitant impedance, and failures in the region of line can be correctly reflected. Since concomitant impedance protection effectively utilizes two-terminal electrical information, the fault can be quickly and reliably operated in the line region, misoperation on the failures out of the line region can be avoided, and the protection has relatively higher sensitivity.
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3.发明申请公开(公告)号：US20180375322A1
公开(公告)日：2018-12-27
申请号：US16062515
申请日：2016-07-11
Applicant: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED , STATE GRID CORPORATION OF CHINA , CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA
Inventor： Xuming LIANG , Yarong GUO , Huanzhang LIU , Xiao LI , Zexin ZHOU , Dingxiang DU , Delin WANG , Jing LI , Huixin LI , Zhongqing LI
Abstract: A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.
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公开(公告)号：US10985547B2
公开(公告)日：2021-04-20
申请号：US16062515
申请日：2016-07-11
Applicant: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED , STATE GRID CORPORATION OF CHINA , CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA
Inventor： Xuming Liang , Yarong Guo , Huanzhang Liu , Xiao Li , Zexin Zhou , Dingxiang Du , Delin Wang , Jing Li , Huixin Li , Zhongqing Li
Abstract: A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.
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公开(公告)号：US20240429705A1
公开(公告)日：2024-12-26
申请号：US18825497
申请日：2024-09-05
Applicant: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE CO., LTD. , STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER COMPANY , STATE GRID CORPORATION OF CHINA
Inventor： Guoliang ZHAO , Weiguo LI , Qiuyu SHI , Xianshan GUO , Guangyao QIAO , Fangyi LI , Yunfei XU , Haijun LIU , Yanjiao JIN , Zhe CHENG
IPC: H02H9/04
Abstract: A vertical thyristor switch for a controllable surge arrester includes an insulating sleeve and a vertical cylindrical switch core body encapsulated inside the insulating sleeve. The switch core body includes thyristor valve sections, a reactor, driving units, a voltage equalizing assembly section, a structural member and a connecting member; and after being connected to the driving units on one side of the thyristor valve sections, the thyristor valve sections are arranged, together with the voltage equalizing assembly section, in a space of a lower section of the structural member, an upper section of the structural member is provided with the reactor, and components inside the switch core body are electrically connected through the connecting member.
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Patent Agency Ranking
公开(公告)号：US12159245B2
公开(公告)日：2024-12-03
申请号：US17652681
申请日：2022-02-26
Applicant: Economic and Technological Research Institute of State Grid Liaoning Electric Power Co., Ltd. , State Grid Corporation of China , Northeast Electric Power University
Inventor： Xiao Pan , Mingli Zhang , Lin Zhao , Na Zhang , Zhuoran Song , Nantian Huang , Jing Gao , Xuming Lv , Hua Li , Mengzeng Cheng , Xing Ji , Wenying Shang , Yixin Hou , Suo Yang , Bo Yang , Yutong Liu , Linkun Man , Xilin Xu , Haifeng Yang , Fangyuan Yang , Kai Liu , Jinqi Li , Zongyuan Wang
IPC: G06Q10/04 , G06F17/15 , G06F18/211 , G06F18/2133 , G06F18/23213 , G06N3/0475 , G06Q50/06 , G06F113/06
Abstract: A method for predicting a day-ahead wind power of wind farms, comprising: constructing a raw data set based on a correlation between the to-be-predicted daily wind power, the numerical weather forecast meteorological feature and a historical daily wind power; obtaining a clustered data set and performing k-means clustering, obtaining a raw data set with cluster labels, and generating massive labeled scenes based on robust auxiliary classifier generative adversarial networks; determining the cluster label category of the to-be-predicted day based on the known historical daily wind power and numerical weather forecast meteorological feature, and screening out multiple scenes with high similarity to the to-be-predicted daily wind power based on the cluster label category; and obtaining the prediction results of the to-be-predicted daily wind power at a plurality of set times based on an average value, an upper limit value and a lower limit value of the to-be-predicted daily wind power.
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7.发明公开公开(公告)号：US20240226624A1
公开(公告)日：2024-07-11
申请号：US17925837
申请日：2022-08-01
Inventor： Jiaqing Zhang , Yong Huang , Yifu Zhou , Jinzhong Li , Xiaodong Zhang , Dengfeng Cheng , Sha Luo , Yi Guo , Fengju Shang , Yubiao Huang , Rui Liu
Abstract: The present disclosure provides an air mixer for a compressed air foam (CAF) fire-extinguishing system. A foam concentrate and compressed air are respectively transported by a liquid inlet pipe and an air inlet pipe. When the compressed air and the foam concentrate enter a straight pipe through a first tapered pipe, they reach an outlet end of the first tapered pipe through a path narrowing due to different cross-section diameters at two ends of the first tapered pipe, and there is a compression process. Under an action of a high-pressure airflow, the foam concentrate is fully mixed. The mixed foam concentrate reaches a porous plate of the straight pipe and can be mixed secondarily. When the foam concentrate is discharged by a second tapered pipe, a flow path widens and there is a release process.
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公开(公告)号：US12024643B2
公开(公告)日：2024-07-02
申请号：US17601708
申请日：2021-08-06
Inventor： Wenjing Li , Xiaoming Wang , Xingeng Li , Bo Jiang , Shuo Yao , Gengzeng Zhu , Yaping Wu , Lijun Zong , Shuang Tian , Fengjie Yan , Zhibin Fan , Zhenyue Zhang , Die Wang , Zhiyue Gao , Chunxu Mi , Qian Wang
IPC: C09D183/04 , C09D5/16 , C09D5/18 , C09D7/61
CPC classification number: C09D183/04 , C09D5/1687 , C09D5/18 , C09D7/61
Abstract: The present invention provides a super-hydrophobic anti-pollution flashover coating with hydrophobicity transference, which is prepared from the following raw materials: a silicone resin, an organic solvent, silicon oxide, a flame retardant, a cross-linking agent, a coupling agent, a dispersing agent, a defoaming agent, a leveling agent, and a silicone resin curing agent. The present invention also provides a preparation method of the super-hydrophobic anti-pollution flashover coating with hydrophobicity transference. The anti-pollution flashover coating provided by the present invention has both super-hydrophobicity and hydrophobicity transference, which improves the hydrophobicity of a surface of an anti-pollution flashover coating layer, ensures the long-term effectiveness of an anti-pollution flashover coating layer, and prolongs a service life of an anti-pollution flashover coating layer, thereby solving the problem that existing anti-pollution flashover coatings have low hydrophobicity and are prone to contaminant accumulation on the surface and reducing the occurrence probability of pollution flashover accidents.
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公开(公告)号：US20240192191A1
公开(公告)日：2024-06-13
申请号：US17789534
申请日：2021-12-10
Applicant: State Grid Hebei Electric Power Co., Ltd. Research Institute , State Grid Corporation of China , State Grid Hebei Energy Technology Service Co., Ltd. , HEBEI SILICON VALLEY CHEMICAL CO., LTD. , ZIBO QIANHENG AUTOMATION ENGINEERING CO., LTD.
Inventor： Boyan Jia , Jie Liu , Yanwei Xia , Xianhai Pang , Yuhao Zhao , Shilin Li , Liqiang Song , Xiangxia Liu
CPC classification number: G01N33/445 , G01N3/20 , G01N3/40 , G01N21/31
Abstract: A method for evaluating an aging state of a silicone rubber composite insulator includes: step 1: collecting samples from the silicone rubber composite insulator, and subjecting samples in a surface layer and a center layer successively to hydrophobicity, flexing resistance, hardness, color, and absorbance tests; step 2: determining relevant data of the samples in a natural evolution process according to the tests in step 1; step 3: subjecting the samples to thermo-oxidative aging; and after the thermo-oxidative aging is completed, subjecting the samples to a hardness test of artificial accelerated evolution, and calculating position coordinates (F1, F2) of the samples in an aging space; and step 4: classifying the samples in advance and solving an aging state centroid of each classified population, calculating a minimum aging distance based on the position coordinates in step 3, and evaluating the aging state of the silicone rubber composite insulator.
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10.发明授权公开(公告)号：US12009858B2
公开(公告)日：2024-06-11
申请号：US17610695
申请日：2021-08-24
Applicant: State Grid Chongqing Electric Power Co. Electric Power Research Institute , State Grid Corporation of China
Inventor： Yongfu Li , Xiping Jiang , Xingzhe Hou , Qian Wang , Yingkai Long , Qiang Yao , Siquan Li , Xiaoxiao Luo , Yuxiang Liao , Haibing Zhang , Jiankang Bao , Haitao Wu
CPC classification number: H04B10/11 , H02N99/00 , H04B10/50 , H04B10/502 , H04B10/806 , H04B10/808
Abstract: A multi-sensor data fusion-based self-powered online monitoring system for a transmission line includes a plurality of detection nodes, an optical communication receiving and demodulation module, and a data processing module. The detection nodes each include a vibration energy harvesting module, a sensing module, and an optical communication modulation and transmitting module. The detection node uses a triboelectric nanogenerator (TENG) to convert and harvest energy, uses the sensing module to acquire a plurality of types of sensing data, and uses the optical communication modulation and transmitting module to modulate and transmit the sensing data. The optical communication receiving and demodulation module correspondingly receives and demodulates the sensing data, and transmits the sensing data to the data processing module for processing. The processing includes using a weighted least square method to fuse homogeneous sensing data and using a fuzzy comprehensive evaluation method to analyze heterogeneous sensing data.
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