公开(公告)号：US20180143176A1

公开(公告)日：2018-05-24

申请号：US15572823

申请日：2015-07-17

申请人： Mitsubishi Electric Corporation

发明人： Ryota KURIYAMA ,  Fukutaro KATO ,  Shiki HAYAMIZU ,  Kota MIZUNO ,  Satoru TOYAMA

IPC分类号： G01N33/28 ,  H01F27/00 ,  G01R31/00 ,  H01F27/12

CPC分类号： G01N33/2841 ,  G01R31/00 ,  G01R31/027 ,  H01F27/004 ,  H01F27/12

摘要： The present invention is a diagnosis method for internal fault of an oil-immersed electric apparatus using a silicone oil as an insulating oil. The method diagnoses an internal fault of the oil-immersed electric apparatus based on a first concentration ratio that is a concentration ratio between two gases selected from an analysis gas group consisting of hydrogen gas, methane gas, ethane gas, and ethylene gas contained in the, silicone oil, and a second concentration ratio that is a concentration ratio between the other two gases selected from the analysis gas group. A combination of the two gases and a combination of the other two gases are a combination of ethylene gas and hydrogen gas, a combination of ethane gas and hydrogen gas, a combination of ethylene gas and methane gas, or a combination of methane gas and ethane gas.

公开(公告)号：US09891259B2

公开(公告)日：2018-02-13

申请号：US15379248

申请日：2016-12-14

申请人： International Business Machines Corporation

发明人： Satsuo Kiyono ,  Eiji Ohno ,  Masahiro Uemura

IPC分类号： G01R31/02 ,  G01R31/04 ,  G01K3/04

CPC分类号： G01R31/04 ,  G01K3/04 ,  G01R31/027

摘要： The service life of electrical equipment is predicted using a thermal history sensor mounted in the electrical equipment. At least one thermal history sensor is mounted inside or on an outer wall surface of electrical equipment. The thermal history sensor includes dissimilar metal joints, and the resistance values of the dissimilar metal joints change in response to the amount of intermetallic compound growing in the dissimilar metal joints due to the temperature inside the electrical equipment or of the outer wall thereof during operation. A determining mechanism periodically or irregularly monitors and stores in memory the resistance values of the dissimilar metal joints from the thermal history sensor, and uses the stored history of resistance values to predict the service life of the electrical equipment.

公开(公告)号：US20180041027A1

公开(公告)日：2018-02-08

申请号：US15552080

申请日：2016-02-05

申请人： MITSUMI ELECTRIC CO., LTD.

发明人： Hiroki MATSUDA ,  Yukio MURATA

IPC分类号： H02H9/02 ,  H02M1/14 ,  H02H7/125 ,  H02M1/088 ,  G01R31/02 ,  H02M1/32

CPC分类号： H02H9/025 ,  G01R31/025 ,  G01R31/027 ,  H02H7/1257 ,  H02M1/088 ,  H02M1/143 ,  H02M1/32 ,  H02M3/28

摘要： A semiconductor device for power supply control includes an on/off control signal generation circuit which generates a control signal for turning on or off a switching element; a current detection terminal to which voltage in proportion to a current flowing in a primary-side winding wire of a transformer is input; a pull-up unit with high impedance provided between the current detection terminal and a terminal to which an internal power supply voltage is applied; and a terminal monitoring circuit which determines that the current detection terminal is abnormal when comparing the voltage of the current detection terminal with a predetermined voltage and detecting that the voltage of the current detection terminal is higher than the predetermined voltage. When the terminal monitoring circuit detects abnormality of the current detection terminal, a signal generation of the on/off control signal generation circuit is stopped by a signal output from the terminal monitoring circuit.

公开(公告)号：US20180031625A1

公开(公告)日：2018-02-01

申请号：US15550341

申请日：2016-02-19

申请人： IFD INTERNAL FAULT DETECTOR CORP.

发明人： Justin George PEZZIN ,  Jeremy Michael VAN HORN ,  Yen-You LIN ,  John Paul CHISHOLM ,  Sophie Anne RAMSDEN

IPC分类号： G01R31/02 ,  G01L23/02 ,  G01L23/04 ,  G01K5/70

CPC分类号： G01R31/025 ,  G01K5/70 ,  G01L23/02 ,  G01L23/04 ,  G01R31/027 ,  G01R31/028

摘要： An integrated fault monitoring apparatus for electrical devices has an internal fault detector for detecting transient pressure surges within the electrical device, a pressure relief valve for allowing release of pressure during normal operating conditions of the electrical device, a temperature indicator for indicating that an operating temperature of the electrical device has gone above a predetermined threshold, and/or a sudden pressure relief device for allowing air to escape from the electrical device in the event of a sudden and significant increase in pressure within the electrical device. Methods of using the apparatus are provided.

公开(公告)号：US09866137B2

公开(公告)日：2018-01-09

申请号：US14693742

申请日：2015-04-22

申请人： LSIS CO., LTD.

发明人： Yong Kil Choi

IPC分类号： H02M5/458 ,  G01R35/00 ,  G01R31/02 ,  G01R15/14

CPC分类号： H02M5/458 ,  G01R15/14 ,  G01R31/027 ,  G01R35/00

摘要： A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: providing first to Nth potential transformers to be installed at different locations in a high voltage direct current (HVDC) transmission system; supplying a first voltage to the first to Nth potential transformers provided; measuring voltage values output through the first to Nth transformers by the first voltage supplied; determining whether there is a deviation between the measured voltage values; and determining compensation values for correcting the measured voltage values to the same voltage value when there is the deviation.

公开(公告)号：US20180003759A1

公开(公告)日：2018-01-04

申请号：US15498186

申请日：2017-04-26

申请人： Tech Mahindra Limited

发明人： Arya Kumar Bhattacharya ,  Sayantan Hazra ,  Amrita Agnes George

IPC分类号： G01R31/02 ,  G01R31/00

CPC分类号： G01R31/027 ,  G01R31/003

摘要： The present INVENTION envisages a system and method for accurately calculating the ageing life of the transformer. The system includes monitoring devices to receive the various transformer parameters in real-time which are further processed according to the enhanced formulation proposed by the present invention in a computing platform and the precise transformer ageing life is delivered. Specifically, the method is provided for enhancing the thermal model accuracy by incorporating empirical factors thereby bringing it at par with accuracy levels of DP method whilst maintaining the facility of real-time estimation within a Smart-Grid framework

公开(公告)号：US20170356950A1

公开(公告)日：2017-12-14

申请号：US15543720

申请日：2016-01-05

申请人： LG INNOTEK CO., LTD.

发明人： Yong Suk CHAE

IPC分类号： G01R31/02 ,  H02J5/00 ,  H01F38/14

CPC分类号： G01R31/027 ,  B60L53/12 ,  G01R31/024 ,  H01F38/14 ,  H02J5/005 ,  H02J50/10 ,  Y02T10/7005 ,  Y02T10/7072 ,  Y02T90/122 ,  Y02T90/14

摘要： Provided is an apparatus for determining an abnormal status of a wireless power transmission coil, the apparatus including an input-current sensor configured to detect an input current and provided at an input side of a power transmission coil, an output-current sensor configured to detect an output current and provided at an output side of the transmission coil, and a controller configured to compare each of the input current and the output current with a predetermined threshold value corresponding thereto to determine whether a disconnection or a short circuit occurs in the transmission coil.

公开(公告)号：US20170336462A1

公开(公告)日：2017-11-23

申请号：US15522323

申请日：2015-10-28

申请人： OMICRON ELECTRONICS GMBH

发明人： Reinhard KAUFMANN ,  Boris UNTERER ,  Markus PÜTTER

IPC分类号： G01R31/02 ,  G01R31/06 ,  H01H9/54

CPC分类号： G01R31/027 ,  G01R31/025 ,  G01R31/06 ,  H01H9/54 ,  H01H2009/0061

摘要： A transformer test device (10) for testing a transformer (40) has connections (12) for releasably connecting the transformer test device (10) to the transformer (40). The transformer test device (10) has a source (13) for generating a test signal for testing the transformer (40). The transformer test device (10) has a controllable switching means (15) which is connected to the connections (12) during a transformer test for the purpose of short-circuiting at least one winding (42) of the transformer (40).

公开(公告)号：US09804219B2

公开(公告)日：2017-10-31

申请号：US14268537

申请日：2014-05-02

申请人： ABB TECHNOLOGY AG

发明人： Matthias Steiger ,  Peter Werle ,  Janusz Szczechowski ,  Andreas Kirschmann ,  Oleg Kouzmine

IPC分类号： G01R31/02 ,  H05K7/14 ,  E04H5/04 ,  B65D88/74

CPC分类号： G01R31/027 ,  B65D88/744 ,  E04H5/04 ,  H05K7/1497

摘要： A testing container includes a right-parallelepiped-like container, electrical components of a transformer test system which are arranged in the container and which represent a respective heat source during a testing operation, and a cooling system including at least one heat exchanger. In addition, the testing container includes a movement apparatus configured to move the at least one heat exchanger from a transport position within the container into a working position which is located at least partially outside the container. Thus, the at least one heat exchanger is movable by means of the movement apparatus from the transport position within the container into the working position which is located at least partially outside the container.

公开(公告)号：US20170292999A1

公开(公告)日：2017-10-12

申请号：US15357766

申请日：2016-11-21

申请人： GRID20/20, Inc.

发明人： Randall Turner ,  Michael Vandenberg ,  Joseph Beaudet ,  Qi Fan Lu

IPC分类号： G01R31/42 ,  G01R21/133

CPC分类号： G01R31/42 ,  G01R19/2513 ,  G01R21/133 ,  G01R31/027 ,  G06F11/0796 ,  H02H3/165 ,  H02H7/04

摘要： The present disclosure is a transformer monitoring system that has a transformer monitoring device that reads a measurement on at least one node of a transformer. Additionally, the system has a processor that analyzes the measurement and compares the measurement to a threshold value. In addition, the processor transmits an alert to utility personnel if the comparison indicates that the system is not operating properly.