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1. 发明专利

JPH07263243A LIFETIME DIAGNOSTIC METHOD FOR OIL-IMMERSED ELECTRIC MACHINE AND CENTRIFUGAL VESSEL USED FOR THIS METHOD 失效
公开(公告)号：JPH07263243A
公开(公告)日：1995-10-13
申请号：JP5596994
申请日：1994-03-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： MIYAMOTO AKIO , NANBA SADAO , AMIMOTO TAKESHI
IPC分类号： G01R31/12 , B04B7/08 , H01F27/00 , H01F41/00
摘要： PURPOSE:To obtain a method for determining furfural and derivatives in an insulating oil in a short time and diagnosing the lifetime of an oil-immersed electric machine with high accuracy. CONSTITUTION:An insulating oil is sampled from an oil-immersed electric machine and mixed with an organic liquid for dissolving furfural and the like and then the mixture is shaken. An organic liquid layer is then sampled and the insulating oil component is removed by centrifugal separation. Subsequently, the organic liquid layer subjected to centrifugal separation is sampled and the furfural and the like is analyzed by fast liquid chromatograph, for example, thus diagnosing the lifetime of the oil-immersed electric machine. Since the insulating oil component in the organic liquid layer can be separated in a short time by centrifugal separation, the analytic time can be shortened and the accuracy of measurement can be enhanced by protecting the detector against noise.

2. 发明专利

JPH06213849A PREESTIMATING METHOD OF CHARACTERISTIC OF TEMPERATURE DEPENDENCE AND CONVERTING DEVICE OF CHARACTERISTIC OF TEMPERATURE DEPENDENCE 失效
公开(公告)号：JPH06213849A
公开(公告)日：1994-08-05
申请号：JP649893
申请日：1993-01-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： MIYAMOTO AKIO
IPC分类号： G01N27/08
摘要： PURPOSE:To preestimate a specific value of another temperature precisely and simply by preestimating the value of a tensile force at the other temperature from a measured value of a one-point temperature by using a specific equation. CONSTITUTION:A fresh equation comprising a compensation effect which can be expressed by the Arrhenius equation and the relationship between a frequency factor and an activation energy of the arrhenius equation is introduced, a constant of the compensation effect enabling preestimation of another temperature from a one-point temperature by using the aforesaid equation is determined by measurement, and the characteristic of the other temperature is preestimated by using the constant. In other words, the value of a constant (b) of an equation for preestimating a value t2 of another temperature T2 is made -0.0014mol/cal on the basis of a measured value t1 of a one-point temperature T1, a constant (a) being the unknown is determined by substituting a measured value of a tensile force at a two-point temperature, and the value of the tensile force at the other temperature is preestimated from the equation by using the constants (a) and (b). In the equation, R is 1.987cal/mol/deg. and T1 and T2 absolute temperatures.

3. 发明专利

JPH04350555A ORGANIC REDUCTIVE COMPOUND DETECTING SOLUTION 失效
公开(公告)号：JPH04350555A
公开(公告)日：1992-12-04
申请号：JP12410091
申请日：1991-05-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA TAKASHI , MIYAMOTO AKIO
IPC分类号： C05G1/08 , G01N21/82 , G01N31/00 , G01N31/22
摘要： PURPOSE:To qualitatively and quantitatively detect a very small amount of an org. reductive compound component with high sensitivity by using a solution prepared by adding a transparent water-soluble surfactant to a silver nitrate ammonia solution. CONSTITUTION:Ammonia is added to an aqueous silver nitrate solution until an once generated precipitate disappears to obtain a silver nitrate ammonia solution and an anionic transparent water-soluble surfactant is further added to said solution in an amount of about 1% to prepare an org. reductive compound detecting solution. Solutions containing a reductive compound, for example, acetaldehyde in amounts of about 2, 5 and 10ppm are preliminarily prepared to be added to the detecting solution by about 1.5ml to obtain sample solutions and the absorbancies of the sample solutions are measured at a wavelength of 360nm to form a calibration curve. When this detecting solution is used, precipitated silver is not bonded to the wall of a container and dispersed in the unreacted silver nitrate ammonia solution in a colloidal form and the transparent solution is changed to a yellow or yellowsh brown solution. On the basis of this discoloration or the degree thereof, an extremely small amount of an org. reductive component can be qualified and quantified.

4. 发明专利

JPH0461105A ELECTRIC APPARATUS 失效
公开(公告)号：JPH0461105A
公开(公告)日：1992-02-27
申请号：JP16460290
申请日：1990-06-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： TSUCHIE MOTOO , MIYAMOTO AKIO
IPC分类号： B23H1/08 , H01B3/20 , H01F27/04 , H01F27/14
摘要： PURPOSE:To suppress carbon generated upon arc discharge by using straight- chain paraffin or straight-chain olefin or its derivative liquid for the discharge part. CONSTITUTION:Straight-chain paraffin or straight-chain olefin or its derivative liquid is used for a part which is accompanied by discharge. This can provide electric apparatus which generates little carbon upon arc discharge. Carbon generated upon insulation breakdown may impair characteristics of the apparatus by deposition on the electrode or the insulator. In such a case, a surfactant is used: use of non-ionic one with hydroxyl groups at the terminal of straight- chain carbon fluoride can reduce increases in carbon caused by addition of surfactant.

5. 发明专利

JPH0387006A DETERIORATION DIAGNOSING APPARATUS FOR OIL-FILLED ELECTRIC DEVICE 失效
公开(公告)号：JPH0387006A
公开(公告)日：1991-04-11
申请号：JP22421889
申请日：1989-08-30
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： MAKINO YOSHIHIRO , MIYAMOTO AKIO , YASUDA SHINJI , YAMASHITA TAKAHIRO , MOCHIZUKI TOSHIYUKI
IPC分类号： H01F27/14 , H01F27/00 , H01F27/20
摘要： PURPOSE:To accurately and simply diagnose deterioration of the device by passing gas through insulation oil and extracting the gas having boiling point at a specific temperature or higher from the insulation oil, and detecting deterioration product. CONSTITUTION:Insulation oil 2 collected from an oil-filled electric device is introduced from an inlet 4 into a vessel 1, a pump 33 is operated under a state so regulated that the vessel 1 communicated with a flowmeter 11, and then air is bubbled into the oil 2. Thus, components such as alcohols, aldehydes, ketones, etc., having boiling point of -30 deg.C or higher, which are the deteriorable component of cellulose insulating material contained in the oil 2, are extracted. Then, the concentration of the deteriorated component is measured as a total amount by detecting means 12 such as a hot-wire type semiconductor sensor, etc., made of tin oxide ceramics, and displayed on a concentration display unit. Thus, deterioration of the device can be accurately and simply diagnosed.

6. 发明专利

JPS63281310A NONCOMBUSTIBLE INSULATING REFRIGERANT 失效
公开(公告)号：JPS63281310A
公开(公告)日：1988-11-17
申请号：JP11345487
申请日：1987-05-12
申请人： MITSUBISHI ELECTRIC CORP
发明人： MAKINO YOSHIHIRO , HARA TAKASHI , MIYAMOTO AKIO
IPC分类号： H01B3/24
摘要： PURPOSE:To obtain an insulating refrigerant with low fluid point and viscosity and excellent noncombustibility by combining perfluorocarbon to a mixed refrigerant made of silicone oil and chlorofluorocarbon. CONSTITUTION:Perfluorocarbon 5-25vol.% is combined to a mixed refrigerant made of silicone oil 40-60vol.% and chlorofluorocarbon 60-40vol.%. The preset quantity of perfluorocarbon serves to lower the fluid point and viscosity of this noncombustible insulating refrigerant. It is thereby used for a gas insulating transformer or the like and completely satisfies the performance required as the electric insulating oil and is noncombustible.

7. 发明专利

JPS63152690A NONFLAMMABLE INSULATION REFRIGERANT 失效
公开(公告)号：JPS63152690A
公开(公告)日：1988-06-25
申请号：JP30035286
申请日：1986-12-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARA TAKASHI , MAKINO YOSHIHIRO , MIYAMOTO AKIO
IPC分类号： C09K5/04
摘要： PURPOSE:To obtain the titled nonflammable refrigerant effective in suppressing corrosion of metal and suitable for a gas-insulated transformer, gas-insulated reactor, gas-insulated tap changer, etc., by adding a specific small amount of benzotriazole to a flon mixture, etc. CONSTITUTION:The objective refrigerant can be produced by adding (A) benzotriazole in an amount of 100-1,000ppm to (B) either of (i) a mixture of two or more kinds of flons (e.g. a mixture of the compound of formula I and tetrachlorodifluoroethane), (ii) a mixture of one or more kinds of flons and a hydrocarbon oil [e.g. a mixture of the component (i) and a phosphoric acid ester of formula II] or (iii) a mixture of one or more kinds of flons and a silicone oil [e.g. a mixture of the component (i) and a dimethylpolysiloxane].

8. 发明专利

JPS63100371A ELECTROSTATIC MONITORING DEVICE 失效
公开(公告)号：JPS63100371A
公开(公告)日：1988-05-02
申请号：JP13572187
申请日：1987-05-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： FUKAMACHI TETSUO , YAMADA NAOYA , KISHI AKIO , MIYAMOTO AKIO
IPC分类号： G01N27/60 , G01R27/02 , G01R29/24 , H01F27/00
摘要： PURPOSE:To prevent a transformer main body from causing dielectric breakdown due to electrostatic discharging by branching an insulating oil passage and connecting a fluid electrostatic charging evaluation part tank and connecting a fine ammeter between a metallic pipe provided in the tank in an insulating state and the ground. CONSTITUTION:The cooler 8 of a cooling device B is connected to the transformer main body A by upper piping 7 and lower piping 9. Insulating oil is circulated in a cooling duct 4 in the main body A by those piping 7 and piping 9. Further, an insulating oil circulation path 21 formed by providing an intake and an outlet to the piping 9 is arranged, and the flow rate electrostatic charging evaluation part tank 19 is arranged in the circulation path 21. Further, the metallic pipe 17 which is insulated by an insulating tube 18 is provided in this tank 19, and the fine current measuring instrument 15 is connected between the pipe 17 and a ground line 14. Then, the quantity of fluid electrostatic charging of the insulating oil generated in the main body A is detected by the cooler 8 side to prevent dielectric breakdown due to the electrostatic discharging of the main body A.

9. 发明专利

JPS6381803A OIL-IMMERSED APPARATUS 失效
公开(公告)号：JPS6381803A
公开(公告)日：1988-04-12
申请号：JP22871586
申请日：1986-09-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： MIYAMOTO AKIO
IPC分类号： H01F27/00
摘要： PURPOSE:To easily obtain the sample to be used to diagnose the presence or not of abnormality inside a tank by a method wherein the gas on the oil surface in the tank of an oil-immersed machine is introduced to the prescribed outside position within easy reach by hand through a gas piping, and the gas is collected there. CONSTITUTION:The temperature of insulating oil 3 is taken by a thermometer through the intermediary of a temperature sensing part 14. Then, valves 7A and 7B are opened, a gas pump 9 is driven, gas is circulated in gas space 4, and the gas is replaced with the gas of a gas collecting hole 10. The gas in the gas collecting hole 10 is collected by means of a syringe with a lock, and the collected gas is passed through a gas chromatograph. As the gas component in the gas space 4 and the component of the gas in oil are balanced, the component and the quantity of the gas in oil can be estimated by analyzing the gas, and the presence of abnormality in a transformer can also be diagnosed.

10. 发明专利

JPS62151526A ELECTRICAL STEEL SHEET AND ITS PRODUCTION 失效
公开(公告)号：JPS62151526A
公开(公告)日：1987-07-06
申请号：JP29441185
申请日：1985-12-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： MIYAMOTO AKIO
IPC分类号： C21D9/46 , C21D8/12
摘要： PURPOSE:To obtain an electrical steel sheet having an insulating film of a uniform thickness with good mass productivity by using a baked and electrodeposited varnish layer for the insulating film of the electrical steel sheet provided with the insulating film. CONSTITUTION:The rolled electrical steel sheet material 1 which is subjected to, for example, rolling and annealing is continuously immersed into a bath vessel in which electrodeposition varnish in an emulsion state is filled. A pair of counter electrodes 3 are provided on both sides of the steel sheet 2 in said bath vessel and about 10V DC voltage is impressed between the steel sheet 2 set as a positive polarity and the electrodes 3 set as a negative polarity, respectively. About 5A current is then conducted for about 1sec between these electrodes, by which the varnish layer having the desired 1-10mu thickness is obtd. The steel sheet 2 on which the varnish layer is electrodeposited passes an electric furnace 4 and is subjected to baking in the furnace and thereafter the steel sheet is cooled by a cooling fan 5 and is coiled.

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