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：US20190257812A1

公开(公告)日：2019-08-22

申请号：US16307824

申请日：2016-06-15

申请人： Mitsubishi Electric Corporation

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

IPC分类号： G01N33/28 ,  G01N21/3504 ,  H01F27/10 ,  H01F27/12

摘要： The present invention is directed to a method of estimating an overheating temperature of an oil-immersed electric appliance in which ester oil is used as insulating oil. The overheating temperature is estimated based on a first concentration ratio representing a concentration ratio between two types of gas components contained in the ester oil and a second concentration ratio representing a concentration ratio between other two types of gas components contained in the ester oil. The first concentration ratio and the second concentration ratio are selected from a concentration ratio between acetylene and ethane, a concentration ratio between acetylene and hydrogen, a concentration ratio between acetylene and methane, and a concentration ratio between acetylene and ethylene.

公开(公告)号：US20220020520A1

公开(公告)日：2022-01-20

申请号：US17429081

申请日：2019-04-25

申请人： Mitsubishi Electric Corporation

发明人： Shiki HAYAMIZU ,  Yuichiro ISHIDA

IPC分类号： H01F27/12 ,  H01F27/02 ,  H01F27/30 ,  H01F27/32

摘要： A first plate-like portion is provided with a plurality of first holes extending therethrough in a central axis direction. A second plate-like portion is provided with a plurality of second holes extending therethrough in the central axis direction. The plurality of first holes, the plurality of second holes, a first notch and a second notch overlap one another, to thereby form a flow path which connects one side and the other side of each of a plurality of insulating plates and through which insulating oil can flow in a first direction.