US3844160A - Oil-immersed transformer gas analysis - Google Patents

Oil-immersed transformer gas analysis Download PDF

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Publication number
US3844160A
US3844160A US00175509A US17550971A US3844160A US 3844160 A US3844160 A US 3844160A US 00175509 A US00175509 A US 00175509A US 17550971 A US17550971 A US 17550971A US 3844160 A US3844160 A US 3844160A
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United States
Prior art keywords
cylinder
oil
gas
liquid
piston
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Expired - Lifetime
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US00175509A
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English (en)
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M Yamaoka
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • ABSTRACT A sampling and testing device for diagnosing a condition of a dielectric fluid in an electrical apparatus, e.g., an oil-immersed transformer, by sampling dielectric liquid from the apparatus and extracting dissolved gases from the sampled dielectric fluid and subjecting the extracted gases to analysis for composition so as to infer the condition of the dielectric liquid therefrom.
  • an electrical apparatus e.g., an oil-immersed transformer
  • the device employs a cylinder disposed as part of the electrical apparatus, said cylinder having an inlet valve to draw dielectric liquid samples by vacuum. Gases that may have been generated and dissolved in the sampled dielectric liquid because of local heating or electrical arcs and faults within the electrical apparatus, are liberated by creating partial vacuum in the cylinder, in a closed condition thereof. Gases so extracted are conveyed through a controllable gas outlet valve on the cylinder into a gas analyzer for analysis of gas-composition so as to infer the condition of the liquid dielectric therefrom. Dielectric liquid sampled from the electrical apparatus is returned thereto in a closed circuit.
  • Said cylinder comprises a piston including a flange portion which is expediently provided with a plurality of apertures connecting opposite sidefaces of the flange portion, whereby, during an outward stroke of the piston, dielectric liquid is ejected out of the apertures forcibly thereby facilitating degasification of the dielectric sample within the cylinder.
  • GAS ANALYZER TRANSFORMER l OIL-IMMERSED TRANSFORMER GAS ANALYSIS BACKGROUND OF THE INVENTION produced gas is in such a state that it is resolved in the oil contained in the transformer during an initial period of the abnormal phenomenon. Therefore, if the dissolved gas isextracted out of the oil and is analyzed for its components, the nature and degree of the abnormal phenomenon or fault can be inferred therefrom. Accordingly, any necessary damage-protecting countermeasure can be taken before significant damage is caused to the transformer.
  • the method of deducing the abnormal condition of the transformer from the components of the gas thus analyzed is considered a superior method for determining the condition of the transformer in order to make an early-diagnosis of an internalfault.
  • v i 1 Description of Prior Art tract dissolved gases for analysis is sampled into an oilsampling container 'out of the transformer at the site where the transformer is'installed, and then the sampled oil is brought to a laboratory wherethe degasification and gas analysis are conducted on the oil, and the oil thus tested is abandoned.
  • This conventional method for gas analysis has however the followingdisadvantages: First, at the step of sampling the oil, it is required for the oil not to be in contact with the air as much as possible in order that the ambient air does not further contaminate the sample, or theoil in the transformer itself. Further, when it is required to detect variations in the composition of gas extracted at short intervals of time, the prior art conventional methods would not work since they employ laborious and time-consuming operations. Next, it is to abandon the used sample oil or degasfled oil after every test.
  • An oil-immersed transformer by a simple operation within a short time.
  • An exemplary electrical apparatus on which the device of the invention is applied is hereinafter referred to as an oil-immersed transfomier.
  • Another object of the present invention is to provide a device for diagnosing the condition of the oil contained in an oil-immersed transformer, in which no oil is lost or wasted.
  • a further object of the present invention is to provide a device testing oil contained in an oil-immersed transformer, which device can be also used as a degasification device.
  • FIG. 1 is a schematic diagram of a device for treating oil, according to the present invention, in which a cylinder device SD is shown by a crosssectional view along its longitudinal axis.
  • an oil-immersed transformer Tr havingan oil-circulation system.
  • oil is, circulated from an oil outlet port provided on the transformer through a first check valve V,, a cylinder device SD, a second check valve V and an oil inlet port provided on the transformer leading to the inside of the transformer Tr.
  • the cylinder device SD comprises a cylinder 13 and a piston valve 14, said cylinder 13 being providedwith an oilinlet port 11 and an oil-outlet port '12, both being located at the upper portion of the cylinder 13.
  • the piston valve 14 is installed slidably inside of the cylinder 13.
  • a gas outlet port 15 is provided at the center of the upper portion of the cylinder 13, said gas outlet port 15 being constructed so as to introduce the extracted gas contained in the transformer through a gas check valve V to a gas analyzer GC which may be a conventional type.
  • the piston rod valve 14 comprises a piston portion 141 and a valve flange member 142, said piston rod portion 141 being adapted to form the lower part of the piston valve 14 and being made to be smaller in diameter, while. said valve flange member 142 has a greater diameter substantially equal to the inside diameter of the cylinder 13.
  • Sealing conditions are maintained between the cylinder 13 and the valve flange member 142, and between the cylinder 13 and the piston portion 141 by O-rings l6 and 17, respectively, said O-ring 16 being provided on the periphery of the valve flange member 142, while the other O-ring 17 being is arranged at an opening provided at the bottom of the cylinder 13.
  • the piston valve 14 is provided with several apertures 143 which communicate the upper portion of the piston rod portion 141 with the upper surface of the valve member 142.
  • the gas check valve V is closed, and the check valves V, and V, are opened, and then the piston valve 14 is reciprocated by a piston driving mechanism (not shown) in axial directions as shown by arrow marks.
  • a piston driving mechanism (not shown) in axial directions as shown by arrow marks.
  • oil is sucked into the cylinder 13 from the inside of the transformer Tr through the check valve V and oil-inlet port 11 when the piston valve 14 is moved downwardly; and the oil is pushed into the 3 transformer through theoil-outlet port 12 and check valve V during the course in which the piston valve 14 is moved upwardly up to a position shown by dot-dash line P. Therefore, by repeating the reciprocating motion of the piston valve 14, oil in the transformer Tr can be circulatedthrough a closed oil circulation path,
  • the check valve V is opened, the piston valve 14 is moved to the position P thereby to introduce the extracted gas to the gas analyzer GC, and a part of the oil present on the piston valve is led through the apertures 143 to the chamber B. Then, if the piston valve 14 is pulled downwardly again, gas contained in the oil is discharged out, as apparent from the abovedescribed operation. The reciprocatory operation of the piston and the valve operation is repeated as required thereby to introduce the extracted gas to the gas analyzer GC whereupon the gas analysis performed by well known method is indicated by an indicator, recorded by a recorder, or properly processed as required.
  • the oil sampling and degasification can be carried out even without apertures 143 provided on the piston valve 14, but provision of said holes 143 surely improves the degasification since they produce the agitation and an ejection action of the oil.
  • the gas analyzer GC may be formed integrally with the cylinder device SD, its driving mechanism and the check valves; or may be provided separately as shown in the drawing so that piping and connections may be arranged as required to suit particular requirements. It is preferable to replaceably arrange a filter made of silica gel in series with the check valve V in order to screen certain components still contained in the gas separated from the oil.
  • the piston valve 14 of the device SD may comprise a bellows construction. In this case, the sealing construction arrangement will become more simple.
  • the devices according to the present invention can be formed into one unit thereby to cause possibility of assembling said unit with the transformer.
  • the cylinder device and the check valves may be a motor or electromagnetic type, it is possible to carry out automatically a series of operations from oil sampling to gas analyzing within a short period of time by merely depressing a start push button of the device.
  • the device can be constructedv relatively simple, as a consequence of which, when compared with the previously mentioned conventional method in which oil sampled into a oil-sampling container which is brought to the laboratory for test, the present invention provides a novel method which is greatly improved in serviceability and quickness.
  • the result of analysis of gas contained in the oil can be known immediately at the site where the transformer is installed, and therefore, according to the result of the gas analysis, any suitable necessary countermeasure can be taken without dealy in order to prevent damage to the transformer.
  • lt is one of the characteristic features of the'cylinder device of the invention that it can manage the functions of oil-return sampling, degasification, and oil into the transformer by means of a simple construction.
  • the oil in the transfomier may be degassed and purified in case where the device is operated with the transformer.
  • a sampling-and testing device for diagnosing a condition of a dielectric liquid in an electrical apparatus, the electrical apparatus having an outlet and an inlet for allowing said liquid to pass out of and into said apparatus respectively, said device comprising in combination with said dielectric liquid containing electrical apparatus: cylinder means; closable liquid inlet valve means of said cylinder means, said liquid inlet valve means being connectable to said outlet of said electrical apparatus for letting in dielectric liquid from said electrical apparatus into said cylinder means; closable liquid outlet valve means of said cylinder means, said liquid outlet valve means being connectable to said inlet of the electrical apparatus for returning dielectric liquid from said cylinder means to the electrical apparatus; closable gas outlet valve means of said cylinder means; gas analyzer means connected to said closable gas outlet valve means; piston means operating within said cylinder means for selectively causing one of pressurization and vacuum within said cylinder means, so that when said closable gas outlet valve is closed, said piston means operates to cause said dielectric liquid to flow to and from said cylinder means to said electrical apparatus
  • a device for detecting abnormal conditions of an oil-immersed transformer having an oil-outlet port and an oil-inlet port, by extracting gas dissolved in the oil of the oil-immersed transformer and by analyzing the components of the extracted gas comprising in combination with said oil-immersed transformer: a cylinder device having a cylinder provided with an oil-inlet port; an oil-outlet port and a gas-outlet port; piston means disposed in said cylinder; a gas analyzer connected to said gas-outlet port, said oil-inlet port and oil-outlet port being respectively connectable to said oil-outlet port and said oil-inlet port of the oil-immersed transformer through a first check valve and a second check valve, said gas-outlet port being connectable through a third check valve to the gas analyzer, wherein, when the first and second check valves are opened and the third check valve is closed said piston means reciprocally operates to circulate the oil of the transformer through said cylinder device and when the first, second and third check valves are closed said piston means reciprocally operates
  • a device for detecting abnormal conditions of an oil-immersed transformer as claimed in claim 3, in which said piston means comprises a flange portion which is in liquid-tight contact with an inside surface of said cylinder and a piston rod-portion smaller than said flange portion in diameter so as to form a space with an inside surface of the cylinder, said flange portion being provided with at least one aperture which penetrates therethrough thereby to communicate with said space inside of the cylinder.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
US00175509A 1970-08-27 1971-08-27 Oil-immersed transformer gas analysis Expired - Lifetime US3844160A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45075209A JPS5145770B1 (cg-RX-API-DMAC7.html) 1970-08-27 1970-08-27

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192174A (en) * 1977-10-06 1980-03-11 Automation 2000 S.A. Transformer protective device
EP0017106A1 (en) * 1979-03-26 1980-10-15 Mitsubishi Denki Kabushiki Kaisha Automatic analyzer for combustible gas in oil
US4236404A (en) * 1976-08-31 1980-12-02 General Electric Company Device for monitoring dissolved gases in electrical insulating liquids such as transformer oils
US4374476A (en) * 1977-11-28 1983-02-22 Phillips Petroleum Company Vacuum vaporizing method and apparatus
US4409814A (en) * 1981-02-06 1983-10-18 Tokyo Shibaura Denki Kabushiki Kaisha Gas extracting device
US4763514A (en) * 1986-05-14 1988-08-16 Mitsubishi Denki Kabushiki Kaisha Monitoring equipment for dissolved gas in insulating oil
US5243848A (en) * 1991-06-18 1993-09-14 The National Grid Company Plc Determining the volume of gases in transformer cooling oil
US5271263A (en) * 1990-04-25 1993-12-21 Gibeault Jean Pierre Fluid sampler for detection and monitoring of failure conditions in fluid insulated electrical equipment
US5313818A (en) * 1992-11-12 1994-05-24 Vlsi Technology, Inc. Contaminant monitor for a flowing liquid
US5417821A (en) * 1993-11-02 1995-05-23 Electric Power Research Institute Detection of fluids with metal-insulator-semiconductor sensors
US5591321A (en) * 1993-11-02 1997-01-07 Electric Power Research Institute Detection of fluids with metal-insulator-semiconductor sensors
US5659126A (en) * 1996-04-19 1997-08-19 Farber; Milton Gas chromatograph techniques for on-line testing of transformer faults
US6041643A (en) * 1998-07-27 2000-03-28 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
WO2000052445A1 (en) * 1999-03-05 2000-09-08 Velcon Filters, Inc. Apparatus for removing water from dielectric oil in electrical power transformers
US6155100A (en) * 1998-07-27 2000-12-05 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
US6391096B1 (en) 2000-06-09 2002-05-21 Serveron Corporation Apparatus and method for extracting and analyzing gas
US6401518B1 (en) 1999-07-29 2002-06-11 General Electric Company Fluid filled electrical device with diagnostic sensor located in fluid circulation flow path
US6494617B1 (en) 1999-04-30 2002-12-17 General Electric Company Status detection apparatus and method for fluid-filled electrical equipment
US6582661B1 (en) 2000-06-30 2003-06-24 Csi Technology, Inc. Integrated lubricant analyzer
US7409849B2 (en) * 2003-11-22 2008-08-12 Filmax, Inc. Oil filtration system for plural phase power equipment tanks
US20100212406A1 (en) * 2009-02-25 2010-08-26 Browne Bryant A Collection of dissolved gases from groundwater
CN102455257A (zh) * 2010-10-22 2012-05-16 中国石油化工股份有限公司 低水位浅液面高温温泉气取样装置及方法
CN102507816A (zh) * 2011-11-09 2012-06-20 思源电气股份有限公司 油色谱在线监测数据有效性的检测方法
US20120304734A1 (en) * 2009-12-10 2012-12-06 Kiyoshi Takamoto In-oil gas concentration measuring system and in-oil gas concentration measuring method using same system
US20140260529A1 (en) * 2013-03-14 2014-09-18 Waukesha Electric Systems, Inc. System and Process of Utilizing Oil Quality Analysis and Dissolved Gas Analysis to Detect Early Stage Problems in Oil Filled Electrical Apparatuses
WO2016027003A1 (en) * 2014-08-18 2016-02-25 Vaisala Oyj Method and system for extracting gas or gas mixtures from a liquid for performing dissolved gas or gas mixture analysis
EP3032553A1 (fr) * 2014-12-10 2016-06-15 Sncf Mobilites Dispositif de diagnostic pour transformateur electrique immerge et transformateur electrique comprenant un tel dispositif
US20200246724A1 (en) * 2019-02-04 2020-08-06 Agilent Technologies, Inc. Combined Degassing and Circulation of Liquid
US10832854B2 (en) * 2017-03-13 2020-11-10 Abb Schweiz Ag Dissolved gas analysis devices, systems, and methods
US11796455B2 (en) 2017-03-13 2023-10-24 Abb Schweiz Ag Dissolved gas analysis devices, systems, and methods

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US944247A (en) * 1909-06-11 1909-12-21 Joseph Smith Apparatus for testing mine-gases.
US1426462A (en) * 1917-11-17 1922-08-22 Air Liquide Production of hydrogen
US1997659A (en) * 1929-07-22 1935-04-16 Westinghouse Electric & Mfg Co Gas concentration indicator
US2340898A (en) * 1941-11-29 1944-02-08 Gen Electric Electric apparatus
US3111388A (en) * 1960-06-13 1963-11-19 Mc Graw Edison Co Method for testing electrical instrumentalities for incipient fault
DE1241155B (de) * 1963-12-31 1967-05-24 Geomessdienst Richard Frommhol Vorrichtung zur Entgasung von Gesteinsporoben
US3438738A (en) * 1965-06-01 1969-04-15 Johnson Williams Inc Transformer incipient fault detection
US3680359A (en) * 1968-05-02 1972-08-01 Mc Graw Edison Co Transformer having incipient fault detector

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US944247A (en) * 1909-06-11 1909-12-21 Joseph Smith Apparatus for testing mine-gases.
US1426462A (en) * 1917-11-17 1922-08-22 Air Liquide Production of hydrogen
US1997659A (en) * 1929-07-22 1935-04-16 Westinghouse Electric & Mfg Co Gas concentration indicator
US2340898A (en) * 1941-11-29 1944-02-08 Gen Electric Electric apparatus
US3111388A (en) * 1960-06-13 1963-11-19 Mc Graw Edison Co Method for testing electrical instrumentalities for incipient fault
DE1241155B (de) * 1963-12-31 1967-05-24 Geomessdienst Richard Frommhol Vorrichtung zur Entgasung von Gesteinsporoben
US3438738A (en) * 1965-06-01 1969-04-15 Johnson Williams Inc Transformer incipient fault detection
US3680359A (en) * 1968-05-02 1972-08-01 Mc Graw Edison Co Transformer having incipient fault detector

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236404A (en) * 1976-08-31 1980-12-02 General Electric Company Device for monitoring dissolved gases in electrical insulating liquids such as transformer oils
US4192174A (en) * 1977-10-06 1980-03-11 Automation 2000 S.A. Transformer protective device
US4374476A (en) * 1977-11-28 1983-02-22 Phillips Petroleum Company Vacuum vaporizing method and apparatus
EP0017106A1 (en) * 1979-03-26 1980-10-15 Mitsubishi Denki Kabushiki Kaisha Automatic analyzer for combustible gas in oil
US4409814A (en) * 1981-02-06 1983-10-18 Tokyo Shibaura Denki Kabushiki Kaisha Gas extracting device
US4763514A (en) * 1986-05-14 1988-08-16 Mitsubishi Denki Kabushiki Kaisha Monitoring equipment for dissolved gas in insulating oil
US5271263A (en) * 1990-04-25 1993-12-21 Gibeault Jean Pierre Fluid sampler for detection and monitoring of failure conditions in fluid insulated electrical equipment
US5243848A (en) * 1991-06-18 1993-09-14 The National Grid Company Plc Determining the volume of gases in transformer cooling oil
US5313818A (en) * 1992-11-12 1994-05-24 Vlsi Technology, Inc. Contaminant monitor for a flowing liquid
US5591321A (en) * 1993-11-02 1997-01-07 Electric Power Research Institute Detection of fluids with metal-insulator-semiconductor sensors
US5417821A (en) * 1993-11-02 1995-05-23 Electric Power Research Institute Detection of fluids with metal-insulator-semiconductor sensors
US5659126A (en) * 1996-04-19 1997-08-19 Farber; Milton Gas chromatograph techniques for on-line testing of transformer faults
US6041643A (en) * 1998-07-27 2000-03-28 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
US6155100A (en) * 1998-07-27 2000-12-05 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
US6182500B1 (en) 1998-07-27 2001-02-06 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
US6202473B1 (en) 1998-07-27 2001-03-20 General Electric Company Gas sensor with protective gate, method of forming the sensor, and method of sensing
WO2000052445A1 (en) * 1999-03-05 2000-09-08 Velcon Filters, Inc. Apparatus for removing water from dielectric oil in electrical power transformers
US6609411B1 (en) 1999-03-05 2003-08-26 Velcon Filters, Inc. Apparatus for removing water from dielectric oil in electrical power transformers
US6494617B1 (en) 1999-04-30 2002-12-17 General Electric Company Status detection apparatus and method for fluid-filled electrical equipment
US6401518B1 (en) 1999-07-29 2002-06-11 General Electric Company Fluid filled electrical device with diagnostic sensor located in fluid circulation flow path
US6391096B1 (en) 2000-06-09 2002-05-21 Serveron Corporation Apparatus and method for extracting and analyzing gas
US6582661B1 (en) 2000-06-30 2003-06-24 Csi Technology, Inc. Integrated lubricant analyzer
US7409849B2 (en) * 2003-11-22 2008-08-12 Filmax, Inc. Oil filtration system for plural phase power equipment tanks
US20080295904A1 (en) * 2003-11-22 2008-12-04 Filmax, Inc. Oil filtration system for plural phase power equipment tanks
US20100212406A1 (en) * 2009-02-25 2010-08-26 Browne Bryant A Collection of dissolved gases from groundwater
US20120304734A1 (en) * 2009-12-10 2012-12-06 Kiyoshi Takamoto In-oil gas concentration measuring system and in-oil gas concentration measuring method using same system
US9003865B2 (en) * 2009-12-10 2015-04-14 Kanden Engineering Corporation In-oil gas concentration measuring system and in-oil gas concentration measuring method using same system
CN102455257A (zh) * 2010-10-22 2012-05-16 中国石油化工股份有限公司 低水位浅液面高温温泉气取样装置及方法
CN102455257B (zh) * 2010-10-22 2014-04-02 中国石油化工股份有限公司 低水位浅液面高温温泉气取样装置及方法
CN102507816A (zh) * 2011-11-09 2012-06-20 思源电气股份有限公司 油色谱在线监测数据有效性的检测方法
CN102507816B (zh) * 2011-11-09 2013-12-11 思源电气股份有限公司 油色谱在线监测数据有效性的检测方法
US9513275B2 (en) * 2013-03-14 2016-12-06 Waukesha Electric Systems, Inc. System and process of utilizing oil quality analysis and dissolved gas analysis to detect early stage problems in oil filled electrical apparatuses
US20140260529A1 (en) * 2013-03-14 2014-09-18 Waukesha Electric Systems, Inc. System and Process of Utilizing Oil Quality Analysis and Dissolved Gas Analysis to Detect Early Stage Problems in Oil Filled Electrical Apparatuses
US9915640B2 (en) 2013-03-14 2018-03-13 Spx Transformer Solutions, Inc. System and process of utilizing oil quality analysis and dissolved gas analysis to detect early stage problems in oil filled electrical apparatuses
US10429371B2 (en) 2014-08-18 2019-10-01 Vaisala Oyj Method and system for extracting gas or gas mixtures from a liquid for performing dissolved gas or gas mixture analysis
CN106574918A (zh) * 2014-08-18 2017-04-19 维萨拉公司 用于从液体中提取气体或气体混合物以进行溶解气体或气体混合物分析的方法和系统
WO2016027003A1 (en) * 2014-08-18 2016-02-25 Vaisala Oyj Method and system for extracting gas or gas mixtures from a liquid for performing dissolved gas or gas mixture analysis
CN106574918B (zh) * 2014-08-18 2020-07-14 维萨拉公司 用于从液体中提取气体或气体混合物以进行溶解气体或气体混合物分析的方法和系统
FR3030102A1 (fr) * 2014-12-10 2016-06-17 Soc Nat Des Chemins De Fer Francais Sncf Dispositif de diagnostic pour transformateur electrique immerge et transformateur electrique comprenant un tel dispositif.
EP3032553A1 (fr) * 2014-12-10 2016-06-15 Sncf Mobilites Dispositif de diagnostic pour transformateur electrique immerge et transformateur electrique comprenant un tel dispositif
US10832854B2 (en) * 2017-03-13 2020-11-10 Abb Schweiz Ag Dissolved gas analysis devices, systems, and methods
US11796455B2 (en) 2017-03-13 2023-10-24 Abb Schweiz Ag Dissolved gas analysis devices, systems, and methods
US11860148B2 (en) 2017-03-13 2024-01-02 Abb Schweiz Ag Dissolved gas analysis devices, systems, and methods
US20200246724A1 (en) * 2019-02-04 2020-08-06 Agilent Technologies, Inc. Combined Degassing and Circulation of Liquid
US11772012B2 (en) * 2019-02-04 2023-10-03 Agilent Technologies, Inc. Combined degassing and circulation of liquid

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JPS5145770B1 (cg-RX-API-DMAC7.html) 1976-12-06

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