公开(公告)号：US20240337705A1

公开(公告)日：2024-10-10

申请号：US18619061

申请日：2024-03-27

申请人： Yunnan Power Grid Co., Ltd. Honghe Power Supply Bureau

发明人： Qilong ZHU ,  Fu LI ,  Bing WANG ,  Baode LIN ,  Tao ZHU ,  Shizhen LI ,  Yuntao LIU ,  Rui ZHANG ,  Yanyi XIE ,  Jianlai GUO ,  Yu ZHANG ,  Jinkuo CAO ,  Tao GUO ,  Yongzhi WANG ,  Bing DUAN ,  Yakui DENG ,  Dong LEI ,  Yan QING ,  Yunguang YU ,  Wei YU ,  Maobing LI ,  Lu YANG ,  Lin GAO ,  Zhibin TAN ,  Yanqi YAO ,  Shaohua JIANG ,  Wuzheng HE ,  Haocheng YANG ,  Yunhong XIONG

IPC分类号： G01R31/62 ,  G06F17/11

CPC分类号： G01R31/62 ,  G06F17/11

摘要： The present application relates to the technology field of assessment of aging state of oil paper insulation of the large power transformer and quantitative diagnostic, specifically estimating parameters of the circuit through the initial slope of the recovery voltage. It includes an improved mathematical model for solving parameters of the dielectric response equivalent circuit by using the peak of the recovery voltage, the peak time and the initial slope characteristics; transforming the identification of parameters of the equivalent circuit into a mathematical optimization problem, and then solving the mathematical optimization problem using a particle swarm algorithm. The design of the present application can significantly reduce the sampling data of the recovery voltage, and the measured data in the field and the calculated data of different capacity RVM experiments on real transformers have good consistency, which is conducive to the diagnosis of state of oil paper insulation of the transformer.

公开(公告)号：US12080461B2

公开(公告)日：2024-09-03

申请号：US17844294

申请日：2022-06-20

申请人： Hitachi Energy Ltd

发明人： Stephane Isler ,  Valter Porcellato

IPC分类号： H01F27/10 ,  G01K7/42 ,  G01R31/62 ,  H01F27/40

CPC分类号： H01F27/10 ,  G01K7/427 ,  G01R31/62 ,  H01F27/402 ,  H01F2027/406

摘要： A transformer assembly includes an electric transformer, a temperature sensor system, and a computation unit for determining a thermal state of the electric transformer. The electric transformer includes a cooling device having at least one liquid coolant channel to absorb exhaust heat from the electric transformer, a heat spreader for transferring heat from the liquid coolant to a heat dissipation surface of the heat spreader, and an air blower configured to effect an airstream along the heat dissipation surface. The temperature sensor system includes an entering coolant sensor for providing an entering coolant temperature signal, a leaving coolant sensor for providing a leaving coolant temperature signal, an entering airstream sensor providing an entering airstream temperature signal, and a leaving airstream sensor providing a leaving airstream temperature signal. The computation unit is configured to determine a thermal state of the transformer.

公开(公告)号：US12066502B2

公开(公告)日：2024-08-20

申请号：US17502819

申请日：2021-10-15

申请人： Caterpillar Inc.

发明人： Dachuan Yu ,  Gregory J Speckhart ,  Jesse R Gerdes

IPC分类号： G01R31/62 ,  H02H1/00 ,  H02H7/04

CPC分类号： G01R31/62 ,  H02H1/0007 ,  H02H7/04

摘要： An example transformer includes a controller that determines the currents on a power grid side of the transformer, as well as an inverter/load side of the transformer. The transformer may be of a delta-wye configuration. The controller compares the currents on the delta side of the transformer to the currents on the wye side of the transformer to determine whether the currents on either side are imbalanced. If the currents on the delta side are balanced, while the currents on the wye side are imbalanced, then the controller may determine that an open phase condition exists on the wye side of the transformer. Alternatively, if the currents on the delta side are imbalanced or if the currents on the delta side are balanced and the currents on the wye side are also balanced, then the controller determines that no open phase condition exists.

公开(公告)号：US20240219481A1

公开(公告)日：2024-07-04

申请号：US18539141

申请日：2023-12-13

申请人： Schneider Electric USA, Inc.

发明人： Juan Ignacio Melecio Ramirez ,  Collin Richard Fischels ,  Kenneth Riehl ,  Jeremy D. Schroeder

IPC分类号： G01R31/62 ,  G01R1/04 ,  G01R31/52

CPC分类号： G01R31/62 ,  G01R1/0416 ,  G01R31/52

摘要： A system may include a device under test, a body having a plurality of conductors, a rotation section, a probe associated with the rotation section, the probe configured to house at least a portion of one or more of the plurality of conductors, and a nest having at least one terminal, the nest configured to couple to the device under test and to permit at least a portion of the probe to pass through an opening of the device under test.

公开(公告)号：US12000906B2

公开(公告)日：2024-06-04

申请号：US17459870

申请日：2021-08-27

申请人： Shandong University

发明人： Dongxin He ,  Qingjing Zang ,  Qingquan Li ,  Wenjie Gong ,  Xinyan Feng ,  Han Liu

IPC分类号： G01R31/62 ,  G01K11/24 ,  G01K13/00

CPC分类号： G01R31/62 ,  G01K11/24 ,  G01K13/00

摘要： The present disclosure provides a system and a method for measuring hot-spot temperature of a transformer, wherein the measurement system comprises a processor, an oscilloscope and a plurality of ultrasonic sensors, wherein the ultrasonic sensors are oppositely arranged on an outer wall of a transformer oil tank and electrically connected with the oscilloscope, and the oscilloscope is electrically connected with the processor; the ultrasonic sensors receive signals transmitted by the oppositely arranged ultrasonic sensors and transmit them to the oscilloscope. The method, by applying an ultrasonic wave to measure the hot-spot temperature of a transformer in real time, solves the problems that methods in the prior art are susceptible to the external environment, have short service life and cannot correctly measure the internal temperature of the transformer.

公开(公告)号：US11899075B2

公开(公告)日：2024-02-13

申请号：US18003351

申请日：2021-07-02

申请人： Maschinenfabrik Reinhausen GmbH

发明人： Alexander Alber

IPC分类号： G01R31/62

CPC分类号： G01R31/62

摘要： A device for determining an error probability value for a transformer component, including a signal input interface, a processor unit, and a storage unit, wherein the signal input interface is configured for direct or indirect coupling to a measurement system for a power transformer, the measurement system having multiple sensors that are each designed to record a physical and/or chemical property of the power transformer, the power transformer having multiple transformer components, and each sensor being coupled to at least one of the transformer components of the power transformer by way of a respective related direct or indirect connection, wherein the physical and/or chemical property of the power transformer recorded by the respective sensor is influenced by at least one of the transformer components, wherein the signal input interface is configured to receive a status signal of the measurement system, the status signal representing multiple, different status variables.

公开(公告)号：US11867772B2

公开(公告)日：2024-01-09

申请号：US17608125

申请日：2020-04-22

申请人： Treetech Sistemas Digitais Ltda

发明人： Heber Pedrosa Santos

IPC分类号： G01R31/62 ,  G08B21/20

CPC分类号： G01R31/62 ,  G08B21/20

摘要： A monitoring system, method, and device for sealing electrical equipment (10) and electrical equipment (10) with monitored sealing, including at least one sensor set (100), at least one signaling system (15) and at least one drying system (300), wherein the sensor set (100) includes at least one moisture sensor (20) and at least one liquid presence sensor (25) connected to at least one centralizing element (30), wherein the centralizing element (30) is configured to receive data from at least the sensors and generate outputs corresponding thereto, defining the type of liquid in contact with a sensor, assessing the integrity of the sealing system, and detecting the loss of efficiency of the drying system (300). The system may be configured to detect trends and automatically generate alarms and recommendations, mitigating the from inspections of sealing systems on electrical equipment (10) while enhancing the reliability of the operation, lowering costs and enhancing safety and security.

公开(公告)号：US11860242B2

公开(公告)日：2024-01-02

申请号：US17552790

申请日：2021-12-16

申请人： Palo Alto Research Center Incorporated

发明人： Ajay Raghavan ,  Peter Kiesel

IPC分类号： G01R31/62 ,  G01B11/16 ,  H04B3/46 ,  G01J3/18 ,  G02B6/293 ,  G01L1/24 ,  G01J3/00 ,  G01R19/25 ,  G01D5/353 ,  G02B6/12

CPC分类号： G01R31/62 ,  G01B11/18 ,  G01J3/00 ,  G01J3/1895 ,  G01L1/246 ,  G01R19/2513 ,  H04B3/46 ,  G01D5/353 ,  G02B6/12009 ,  G02B6/2938

摘要： A monitoring system for a power grid includes one or more power transformer monitors. Each power transformer monitor includes a plurality of optical sensors disposed on one or more optical fibers that sense parameters of the power transformer. Each optical sensor is configured to sense a power transformer parameter that is different from a power transformer parameter sensed by at least one other sensor of the plurality of optical sensors. An optical coupler spatially disperses optical signals from the optical sensors according to wavelength. A detector unit converts optical signals of the optical sensors to electrical signals representative of the sensed power transformer parameters.

公开(公告)号：US11815565B2

公开(公告)日：2023-11-14

申请号：US17616310

申请日：2021-10-08

申请人： STATE GRID XINJIANG CO., LTD. ELECTRIC POWER RESEARCH INSTITUTE ,  Nanjing Unitech Electric Power Co., Ltd. ,  State Grid Corporation of China

发明人： Yi You ,  Ling Zhang ,  Kaike Wang ,  Cheng He ,  Puzhi Zhao ,  Ronggang Gao ,  Jianping Zhao ,  Xinxin Wang ,  Xianfu Liu

IPC分类号： G01R31/62

CPC分类号： G01R31/62

摘要： The present disclosure provides a system for perceiving an operating state of a large power transformer based on vibro-acoustic integration, including a perception layer, a network layer, and a diagnostic layer, where the perception layer is used for monitoring, in real time, a state parameter for a coupling vibration signal and an acoustic signal of each of a transformer core, a winding, a clamp and a housing, a state parameter of each of a vibration signal and an acoustic signal during a gear position change of an on-load tap changer (OLTC), and preliminarily diagnosing and analyzing monitored data. The system can monitor the operating state of the OLTC online for a long time, flexibly configure the sensor channel and the sensor type according to different application requirements, automatically acquire and identify the gear position change, and correctly identify and process a gear position corresponding to the monitoring signal.

公开(公告)号：US20230305080A1

公开(公告)日：2023-09-28

申请号：US18246515

申请日：2021-09-03

申请人： MASCHINENFABRIK REINHAUSEN GMBH

发明人： Alexander Alber ,  Tobias Gruber

IPC分类号： G01R31/62

CPC分类号： G01R31/62

摘要： A model of a power transformer describes a transfer behavior for input data into output data as a function of model parameters. In successive time windows, measurement dataset is received from first and second sensors of the power transformer. The model parameters are optimized by executing, for each of the time windows, the following group of steps a) to c), repeatedly: a) determining the output of the model using the input data defined by first sensor data, for the first execution of predefined parameters are used; b) determining a target value, which includes at least one squared error, weighted by a first weighting factor, the squared error is between the second sensor data from the measurement dataset assigned to the given time window and a previously determined output data, and c) determining optimization parameters as new model parameters based on the target value.