JPWO2009054156A1 - Electrical insulation oil diagnostic method for oil-filled electrical equipment - Google Patents

Electrical insulation oil diagnostic method for oil-filled electrical equipment Download PDF

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JPWO2009054156A1
JPWO2009054156A1 JP2009537952A JP2009537952A JPWO2009054156A1 JP WO2009054156 A1 JPWO2009054156 A1 JP WO2009054156A1 JP 2009537952 A JP2009537952 A JP 2009537952A JP 2009537952 A JP2009537952 A JP 2009537952A JP WO2009054156 A1 JPWO2009054156 A1 JP WO2009054156A1
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Japan
Prior art keywords
oil
copper
electrical
insulator
insulating oil
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Japanese (ja)
Inventor
久勝 瓦井
久勝 瓦井
藤田 洋司
洋司 藤田
純二 谷村
純二 谷村
外山 悟
悟 外山
剛 網本
剛 網本
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三菱電機株式会社
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Priority to JP2007278755 priority
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Priority to PCT/JP2008/057401 priority patent/WO2009054156A1/en
Publication of JPWO2009054156A1 publication Critical patent/JPWO2009054156A1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26Oils; viscous liquids; paints; inks
    • G01N33/28Oils, i.e. hydrocarbon liquids
    • G01N33/2835Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
    • G01N33/287Sulfur content

Abstract

A method for accurately diagnosing whether or not an insulating oil and a copper component disposed between the insulators are electrically insulating oil that causes insulation failure due to copper sulfide in an oil-filled electrical device immersed in the electrical insulating oil I will provide a. A step of immersing only the insulator in the electrical insulating oil to deposit a copper component on the insulator, and a step of quantifying the copper deposited on the immersed insulator and diagnosing the electrical insulating oil based on the quantitative result It was set as the electrical insulation oil diagnostic method of the oil-filled electrical equipment which has. Since the amount of copper deposited on the insulator that is not in direct contact with the copper component is quantified, it is possible to accurately diagnose whether or not it is an electrical insulating oil that causes insulation failure due to copper sulfide.

Description

  The present invention relates to a method for diagnosing the quality of an electrical insulating oil in an oil-filled electrical device in which a plurality of copper parts such as a transformer and an insulator sandwiched therebetween are immersed in the electrical insulating oil.

  In oil-filled electrical equipment, such as transformers, in which an insulator sandwiched between copper windings or between multiple copper parts is immersed in electrical insulating oil, the copper parts in the equipment and sulfur in the electrical insulating oil A phenomenon is known in which the components react and copper sulfide is deposited on the surface of the insulator to impair the insulating performance of the insulator. However, details of the copper sulfide formation mechanism are not known. For this reason, under the present circumstances, selection of an electrical insulating oil that hardly causes sulfidation corrosion and development of a technique for removing a sulfur compound have been made.

  For example, in Japanese Patent Document 1 below, a certain amount of electrical insulating oil and a copper plate having a predetermined surface area are sealed in a container and heated at a predetermined temperature for a predetermined time. In addition, the contents of dissolved copper and sulfate ions contained in the electrical insulating oil are measured, and the sulfidation corrosion property of the electrical insulating oil is diagnosed by the sum of the respective contents.

  Moreover, in the following Japanese Patent Document 2, in order to remove sulfur compounds in the electrical insulating oil, a container for storing the electrical insulating oil to be injected into the electrical equipment before injection, and the electrical insulating oil accommodated in the container, It contacts with the sulfur compound contained in electrical insulating oil, and it is set as the structure provided with the copper or copper compound, or copper alloy which capture | acquires and removes a sulfur compound on the surface.

  Further, in the following Non-Patent Document 1, as a test method for diagnosing whether or not copper sulfide is deposited that causes a decrease in insulation on insulating paper, a glass container containing copper wrapped with insulating paper and electrical insulating oil is heated at a high temperature. After storage, the amount of copper sulfide deposited on the insulating paper is evaluated.

JP-A-7-335446 JP 2001-311083 A CLAES BENGTSSON, MATS DAHLUND, JAN HAJEK, LARS F PETTERSSON, KARIN GUSTAFASSON, ROBERT LEANDERSSON, ARNE HJORTSBERG, "OIL CORROSION AND CONDUCTING Cu2S DEPOSITION IN POWER TRANSFORMER WINDINGS", CIGRE SC A2 (Transformers) Electric Systems), 2006, A2-111.

  It is considered that the insulation failure due to copper sulfide is caused by a decrease in electrical resistance between copper components arranged with the insulator sandwiched by copper sulfide deposited on the insulator. That is, the insulation is lowered by copper sulfide deposited on the insulator that is not in direct contact with the copper component. As the amount of copper sulfide deposited on the insulator increases, insulation failure tends to occur. This copper sulfide is considered to be obtained by depositing copper dissolved in electrical insulating oil (hereinafter referred to as copper in oil) as copper sulfide on the insulating paper together with sulfur in the insulating oil. It is thought that the more sulfur compounds in electrical insulating oil and copper eluted in the oil, the more copper sulfide is produced, but as the copper sulfide precipitation experiment proceeds, the amount of dissolved copper and sulfur compounds in the oil It has been found that there is no correlation with the amount of copper sulfide deposited on the insulator.

  In cited document 1, it is a method of diagnosing the progress of sulfidation of a copper member. Although the amount of dissolved copper in the electrical insulating oil is considered to be one of the effective indexes for diagnosing the progress of sulfidation of the copper member, it is not a method for diagnosing copper sulfide precipitation on the insulator surface.

  Therefore, a method of detecting the amount of copper sulfide deposited on the insulator is desirable. However, when the insulating paper is wound around the copper plate as in Non-Patent Document 1, when the copper plate is sulfided, it is in direct contact with the copper plate. There is a high possibility that the copper sulfide produced on the surface of the copper plate is deposited on the insulating paper. As described above, it is copper sulfide that is deposited on an insulator that is not in direct contact with the copper component, which causes a decrease in insulation. Therefore, according to the method of Non-Patent Document 1, the amount of copper sulfide that is deposited on the copper plate surface is reduced. It will be affected.

  Accordingly, the present invention is an oil-filled electrical device in which an insulator and a copper component disposed between the insulators are immersed in electrical insulating oil, and whether or not the electrical insulating oil causes poor insulation due to copper sulfide. It is an object to provide a method for accurately diagnosing the above.

  The method of diagnosing electrical insulation oil for oil-filled electrical equipment according to the present invention is an insulation oil for oil-filled electrical equipment in which an insulator and a copper part disposed between the insulators are immersed in electrical insulation oil containing a sulfur compound. A method of immersing only the insulator in the electrical insulating oil to deposit a copper component on the insulator; and quantifying the copper deposited on the insulator, An electrical insulation oil diagnostic method for oil-filled electrical equipment having a diagnostic step.

  According to the electrical insulation oil diagnostic method for oil-filled electrical equipment of the present invention, the step of immersing only the insulator in the electrical insulation oil to deposit the copper component on the insulator and the amount of copper deposited on the insulator are quantified A step of diagnosing electrical insulation oil based on the quantitative result, and quantifying the amount of copper deposited on the insulator that is not in contact with the copper component. It is possible to accurately diagnose whether or not.

It is the schematic of the instrument cross section used for the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 1. It is a table | surface which shows the measurement result of the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 1. It is the schematic of the instrument cross section used for the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 1. It is the schematic of the instrument cross section used for the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 1. It is the schematic of the instrument cross section used for the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 2. It is the schematic of the instrument cross section used for the electrical insulation oil diagnostic method of the oil-filled electrical equipment of this Embodiment 2.

Explanation of symbols

1 container, 2 lid, 3 electrical insulating oil, 4 insulating paper, 5 gas phase space, 6 inert gas, 7 flow controller, 8 gas inlet, 9 gas outlet, 11 valve, 12 copper plate

<Embodiment 1. >
The electrical insulating oil diagnostic method according to the first embodiment is an insulating oil diagnostic method for an oil-filled electrical device in which an insulator and a copper part disposed between the insulators are immersed in an electrical insulating oil containing a sulfur compound. It is about.

  FIG. 1 is a schematic view of an instrument cross section used in the electrical insulating oil diagnostic method for oil-filled electrical equipment according to the first embodiment. A container 1 that does not react with electrical insulating oil is sealed with a lid 2. Gas pipes serving as a gas inlet 8 and a gas outlet 9 are inserted into two through holes of the lid 2.

  First, the electric insulating oil 3 is put in the container 1, and the insulating paper 4 is immersed in the electric insulating oil 3. Here, the electrical insulating oil 3 may be extracted from the oil-filled electrical device when diagnosing the electrical insulation oil in the existing oil-filled electrical device. The insulating paper 4 is an insulator in which copper does not exist, and for example, kraft paper is used. In order to diagnose electrical insulating oil in an oil-filled electrical device using insulating paper as an insulator, it is preferable to use an unused insulating paper equivalent to the insulating paper used in the oil-filled electrical device if possible.

  Next, the container 1 is sealed with the lid 2, and the inert gas 6 is introduced into the container 1 from the gas inlet 8 and discharged from the gas outlet 9. Thereby, the gas phase space 5 in the container between the lid 2 and the upper surface of the electrical insulating oil 3 is filled with the inert gas. Further, the container 1 is heated in a temperature range of 80 ° C. to 170 ° C. for a predetermined time. The introduction and discharge of the inert gas 6 may be performed during heating. Nitrogen gas or argon gas may be used as the inert gas. That is, the electrical insulating oil 3 is heated in an atmosphere of the inert gas 6.

  After heating for a predetermined time, the insulating paper 4 is taken out from the container 1. The insulating paper 4 is immersed in an appropriate amount of dilute nitric acid and heated to dissolve the copper sulfide deposited on the insulating paper 4. After allowing to cool, the acid solution is analyzed by inductively coupled plasma optical emission spectrometry to calculate the concentration of copper in the solution. Further, the mass per unit area of copper deposited on the insulating paper 4 is calculated from this concentration. Since the mass of copper is proportional to the mass of copper sulfide, when the mass of copper deposited per unit area is greater than or equal to a certain value, the electrical insulating oil is likely to precipitate copper sulfide, so that it is diagnosed as abnormal. In addition, as a method for quantifying copper deposited on the insulating paper 4, other methods such as atomic absorption analysis may be used.

  As described above, the electrical insulating oil diagnostic method of Embodiment 1 includes the steps of immersing an insulator in which copper is not present in the electrical insulating oil and depositing a copper component on the insulator, and the insulator after the immersion The amount of copper deposited on the insulator is measured and the amount of copper deposited on the insulator that is not in direct contact with the copper parts is measured. It is possible to accurately diagnose whether or not the electrical insulating oil causes an insulation failure due to copper sulfide.

  In the above procedure, the step of precipitating the copper component includes heating the electrical insulating oil in which the insulator is immersed under an inert gas atmosphere. The introduction of the inert gas into the container 1 has the effect of expelling the oxygen gas dissolved in the electrical insulating oil 3. The electrical insulating oil 3 is easily sludged due to the presence of oxygen gas. If copper sulfide is deposited on the sludge, the amount of copper deposited on the insulating paper 4 becomes inaccurate. Therefore, the amount of copper deposited on the insulating paper is more accurately determined by performing the heat treatment in an inert gas atmosphere.

  Further, the step of heating the container 1 is performed in order to promote the precipitation of copper sulfide on the insulating paper based on the fact that the higher the temperature, the faster the precipitation of copper sulfide on the insulating paper was observed. Thereby, diagnosis can be performed in a short time. However, if the temperature is raised too much, there will be a problem that the volatile components in the electrical insulating oil will be lost and the oil components will change.

  Hereinafter, more specific experimental examples will be described. First, four types of electrical insulating oils A to D containing sulfur and copper were prepared. The sulfur and copper contents of these electrical insulating oils were analyzed in advance before starting the experiment. The sulfur content in the electrical insulating oil is determined by burning the electrical insulating oil using a combustion device and then blowing the combustion gas into the collection liquid (hydrogen peroxide solution) to form sulfate ions. Asked. The amount of copper in the oil was quantified using a plasma emission spectroscopic analyzer after diluting the electrical insulating oil with an organic solvent.

  Prepare four pieces of equipment shown in FIG. 1, put each electric insulating oil 50 cubic centimeters in each glass container 1, and further craft which is the insulating paper 4 of 10mm in length and 20mm in size in each oil The paper was immersed. Next, the container 1 was held at 120 ° C. for 24 hours while flowing nitrogen gas through the flow rate controller 7 into the gas phase space 5 of the container 1 at a flow rate of 100 cubic centimeters per minute. Then, the kraft paper immersed in each electrical insulating oil was taken out, the copper sulfide deposited on the insulating paper 4 was dissolved in dilute nitric acid, and the amount of copper deposited on the insulating paper 4 was quantified using a plasma emission spectrometer. .

  FIG. 2 is a table showing measurement results of the electrical insulating oil diagnostic method for oil-filled electrical equipment according to the first embodiment. In the table of the figure, the sulfur content and the copper content in the oil are the ppm of the mass of sulfur with respect to the mass of the oil, and the amount of copper deposited on the insulating paper 4 is the copper deposited per square centimeter of the insulating paper 4 It was shown by mass μg The electrical insulating oil A had a sulfur content of 160 mass ppm and the copper content deposited on the insulating paper 4 with respect to the copper content in the oil of 2.3 ppm was 1.7 μg / square cm. The electrical insulating oil B had a sulfur content of 270 mass ppm and the copper content deposited on the insulating paper 4 with respect to the copper content in the oil of 2.1 ppm was 1.4 μg / square cm. The electrical insulating oil C had a sulfur content of 120 mass ppm and the copper content deposited on the insulating paper 4 with respect to the copper content in the oil of 0.7 ppm was not more than the detection limit of 0.15 μg / square cm. The electrical insulating oil D had a sulfur content of 240 mass ppm and the copper content deposited on the insulating paper 4 with respect to the copper content in the oil of 1.9 ppm was 0.15 μg / square cm or less, which is the detection limit of the measurement method. In addition, the presence state of copper was investigated for the insulating paper 4 after being immersed in these electrical insulating oils using X-ray photoelectron spectroscopy, and it confirmed that the copper deposited on the insulating paper 4 was due to copper sulfide. is doing.

  From the above results, it is considered reasonable that the amount of copper deposited on the insulating paper 4 is small in the electric insulating oil C in which both the sulfur content in the oil and the copper content in the oil are much smaller than those of the other electric insulating oils. It is done. The electric insulating oil B having the highest sulfur content in the oil and the electric insulating oil A having the highest copper content in the oil had a copper amount deposited on the insulating paper 4 of 1.4 μg / square cm and 1.7 μg / square cm, respectively. Compared with the electrical insulating oil C in which copper was not detected, a large amount of copper was also considered to be a reasonable result. However, although the electrical insulating oil D has a sulfur content in the oil and a copper content in the oil as high as the electrical insulating oil B, the amount of copper deposited on the insulating paper 4 is below the detection limit. Indicates a low correlation between the sulfur content in oil and the copper content in oil and the amount of copper sulfide deposited on the insulating paper.

  From the above results, it was found that it may not be accurate to diagnose whether the electrical insulating oil is likely to deposit copper sulfide on insulating paper simply by measuring sulfur content in oil and copper content in oil. It was. In the first embodiment, since the amount of copper deposited on the insulating paper is directly quantified, highly accurate diagnosis is possible. In addition, since the insulating paper is immersed in electrical insulating oil without contacting copper, copper sulfide deposited on the copper surface does not adhere to the insulating paper, and the amount of copper deposited on the insulating paper can be quantified more accurately. As a result, highly accurate diagnosis is possible.

  In the first embodiment, insulating paper such as kraft paper is used as the insulator, but insulating material other than insulating paper, for example, ceramics such as alumina and mica, and heat-resistant resin such as epoxy resin may be used. In particular, when electrical equipment in oil uses these insulators, use an insulator of the same material that does not contain copper, and deposit on the insulator in the same procedure as above. The amount of copper to be quantified may be determined, and the electrical insulating oil may be diagnosed from that amount.

  3 and 4 are schematic views of a cross section of the instrument used in the electrical insulation oil diagnostic method for the oil-filled electrical apparatus according to the first embodiment, which is a modification of the instrument of FIG. In FIG. 3, the tip of the gas pipe at the gas outlet 9 is introduced up to the electrical insulating oil 3 so that the gas bubbles 10 emerge from the tip. As described above, the step of maintaining the high temperature is performed while blowing the inert gas into the electrical insulating oil. Since the oxygen gas contained in the electrical insulating oil can be expelled from the oil efficiently, the influence of the oxygen gas is reduced and the diagnostic accuracy is increased. 4 is provided with a valve 11 in each of the gas inlet 8 and the gas outlet 9. After replacing the gas phase space 5 with the inert gas through the inert gas while the valve 11 is opened, both the valves 11 are closed and the step of maintaining the high temperature is performed. There is no need to flow gas during high temperature holding, and this is a simple diagnostic method.

<Embodiment 2. >
The electrical insulation oil diagnosis method of the first embodiment is a diagnosis method related to the electrical insulation oil containing copper in the oil, but the electrical insulation oil diagnosis method of the second embodiment is an unused electrical insulation. It is a diagnosable method for oil. In the first embodiment, first, the step of immersing the insulator in the electrical insulating oil and depositing the copper component on the insulator is performed, but in the second embodiment, the step is performed in the electrical insulating oil with copper and the insulator. This is different in that it is a step of separating and dipping the copper to deposit a copper component on the insulator.

  FIG. 5 is a schematic view of an instrument cross section used in the electrical insulating oil diagnostic method for oil-filled electrical equipment according to the second embodiment. It is the same instrument as FIG. 4 of said Embodiment 1. FIG. As shown in the figure, the copper 12 and the insulator 4 to which copper is not attached are isolated and immersed in the electrical insulating oil 3. The step of heating 3 in the electrical insulating oil and the step of determining the amount of copper deposited on the insulator after immersion are the same.

Below, the specific experiment example using the electrical insulation oil diagnostic method is demonstrated. An electrical insulating oil 3 to be diagnosed of 50 cubic cm, insulating paper 4 which is kraft paper having a short side 10 and a long side 20 mm, and a copper plate 12 having a surface area of 12,000 square mm were immersed in a glass container 1. When immersed in the electrical insulating oil 3, the insulating paper 4 and the copper plate 12 were installed in a separated state. The electrical insulating oil 3 used in the experiment was the same electrical insulating oils B and D as in the first embodiment, and each used did not contain unused copper. The container 1 in which the insulating paper 4 is immersed in the electric insulating oil B, the electric insulating oil D, and the respective test oils is prepared, and the gas phase of the container is supplied with nitrogen gas 6 at a flow rate of 100 cubic centimeters per minute via the flow rate controller 7. The container 1 was stored at a high temperature (held at 120 ° C. for 24 hours) while flowing through the section. Thereafter, the insulating paper 4 was taken out, and the amount of copper deposited on the insulating paper 4 was quantified. As a result, the amount of copper deposited on the insulating paper 4 immersed in the electrical insulating oil B was 1.4 μg / cm 2 , and the amount of copper deposited on the insulating paper 4 immersed in the electrical insulating oil D was ≦ 0.15 μg / cm 2 (below the detection limit). From this, it can be determined that the insulating oil B is an oil that easily deposits copper sulfide on the insulating paper 4, and the insulating oil D is an oil that has a low possibility of depositing copper sulfide on the insulating paper 4.

  Since the electrical insulation oil is diagnosed as described above, it is possible to diagnose whether or not the electrical insulation oil is an oil that easily deposits copper sulfide even if it is an unused electrical insulation oil. In addition, after immersing in the electrical insulating oil with the copper plate and the insulator separated, the amount of copper deposited on the insulator is quantified, and the electrical insulating oil is diagnosed from that value, so the sulfide deposited on the copper plate surface on the insulator Copper does not adhere, and a highly accurate diagnosis is possible.

  Moreover, although the unused electrical insulation oil which does not contain copper was diagnosed above, you may use said method for the diagnosis of the electrical insulation oil containing copper extracted from the existing electrical equipment in oil.

  In addition to insulating paper, other insulating materials such as ceramics such as alumina and mica, and epoxy resins may be used as the insulator. Further, as an instrument for immersing an insulator and copper in electrical insulating oil, for example, an instrument similar to that shown in FIG. 4 of the first embodiment may be used. FIG. 6 is a schematic diagram of a cross section of the instrument used in the electrical insulating oil diagnostic method for oil-filled electrical equipment according to the first embodiment, which is a modification of the instrument of FIG. Since the inert gas can be confined in the gas phase space 5 in the container by the valve 11, it is not necessary to flow the gas while maintaining a high temperature, and a simple diagnostic method is possible.

  As described above, the electrical insulation oil diagnostic method for oil-filled electrical equipment according to the present invention provides electrical insulation for oil-filled electrical equipment such as a transformer in which a copper component and an insulator sandwiched therebetween are immersed in electrical insulation oil. It is useful as a method for diagnosing the quality of oil.

Claims (3)

  1. An insulating oil diagnostic method for an oil-filled electrical device in which an insulator and a copper part disposed between the insulators are immersed in an electrical insulating oil containing a sulfur compound, wherein only the insulator is included in the electrical insulating oil Of the oil-filled electrical device having a step of depositing a copper component on the insulator by immersing the copper and a step of quantifying the copper deposited on the insulator and diagnosing the electrical insulating oil based on the quantitative result Insulating oil diagnostic method.
  2. An insulating oil diagnostic method for an oil-filled electrical device in which an insulator and a copper part disposed between the insulators are immersed in an electrical insulating oil containing a sulfur compound, the insulating oil and the insulator An oil having a step of separating and immersing copper to deposit a copper component on the insulator, and a step of quantifying the copper deposited on the insulator and diagnosing an electrical insulating oil based on the quantitative result Electrical insulation oil diagnostic method for incoming electrical equipment.
  3. The electrical insulating oil diagnostic method for oil-filled electrical equipment according to claim 1, wherein the step of precipitating the copper component includes heating the electrical insulating oil in which the insulator is immersed in an inert gas atmosphere.
JP2009537952A 2007-10-26 2008-04-16 Electrical insulation oil diagnostic method for oil-filled electrical equipment Pending JPWO2009054156A1 (en)

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PCT/JP2008/057401 WO2009054156A1 (en) 2007-10-26 2008-04-16 Method of inspecting electrical insulating oil in oil-filled electrical apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010035336A1 (en) 2008-09-26 2010-04-01 三菱電機株式会社 Oil-filled electric device
JP5466572B2 (en) * 2010-04-28 2014-04-09 株式会社日立製作所 Flow charging diagnostic method for static induction machine
US9983188B2 (en) * 2015-09-17 2018-05-29 King Fahd University Of Petroleum And Minerals Device to measure the corrosive sulfur species formation rate in power transformers and a method of using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02154162A (en) * 1988-12-06 1990-06-13 Toshiba Corp Life deciding method for electronic equipment
JP2000353623A (en) * 1999-06-14 2000-12-19 Mitsubishi Electric Corp Testing apparatus for evaluating insulating material

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2551643Y2 (en) * 1992-02-25 1997-10-27 株式会社明電舎 Nitrogen gas sealed form oil incoming calls machine equipment
JP4125907B2 (en) * 2002-03-28 2008-07-30 株式会社ダイヘン Degradation diagnosis device for oil-filled transformer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02154162A (en) * 1988-12-06 1990-06-13 Toshiba Corp Life deciding method for electronic equipment
JP2000353623A (en) * 1999-06-14 2000-12-19 Mitsubishi Electric Corp Testing apparatus for evaluating insulating material

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