JP4880489B2 - Silicone fluid-containing electrical equipment, silicone fluid-containing transformer, and method for measuring cyclic compounds in silicone fluid used in silicone fluid-containing electrical equipment - Google Patents

Description

  The present invention relates to a silicone liquid-containing electric device using a silicone liquid as an insulating / cooling medium, a silicone liquid-containing transformer, and a method for measuring a cyclic compound in the silicone liquid used in the silicone liquid-containing electric device.

  Conventionally, an insulating oil such as mineral oil has been used as an insulating / cooling medium for a transformer, which is an electric device that uses an insulating / cooling medium.

  By using a flame-retardant silicone fluid as an insulation / cooling medium for the transformer in place of this mineral oil, the fire resistance of the transformer can be improved, and the operating temperature can be increased to make the equipment more compact. You can plan.

  However, when a silicone liquid is used as the insulating / cooling medium, if the operating temperature of the electrical device is made higher than before, a decomposition product having a low molecular weight and a low boiling point is generated due to thermal degradation of the silicone liquid.

  If a large amount of this decomposition product is generated in the silicone liquid, the ignition temperature of the silicone liquid (hereinafter referred to as the flash point) is lowered, and therefore there is a problem that the silicone liquid is easily ignited. The amount of decomposition products generated increases as the operating temperature increases.

  Japanese Patent Laid-Open No. 10-332682 discloses a technique for evaluating the degree of deterioration of electrical insulating oil by measuring the number of chemiluminescence by heating and heating the electrical insulating oil used in oil-filled electrical equipment. ing.

  In JP-A-3-187206, a plurality of gas detectors are arranged in the upper part of a tank of an oil-filled electrical device such as an oil-filled transformer or an oil-filled reactor, and the generated combustible gas is detected efficiently. A technique for analyzing a gas component in oil with a tank structure introduced into a vessel is disclosed.

  Japanese Patent Application Laid-Open No. 59-176683 discloses a technique for determining deterioration of a silicone liquid from a thermogravimetric curve of the silicone liquid for electrical insulation.

  Japanese Patent Application Laid-Open No. 54-114290 discloses a technique for analyzing a gas component in a silicone liquid by extracting it into a gas phase by bubbling at room temperature in an electrical apparatus containing a silicone liquid.

JP-A-10-332682 JP-A-3-187206 JP 59-176683 A JP 54-114290 A

  When the silicone liquid is thermally deteriorated, a cyclomer is formed, and the main component is a trimer, a tetramer, and a pentamer. It has been found that the more the degradation progresses, the greater the amount of cyclic isomers produced. Trimers, tetramers and pentamers have low boiling points and are easy to evaporate. In the initial state that is not deteriorated, the isomer is hardly contained.

  Degradation also produces low molecular weight linear compounds. However, even in the initial state where it has not deteriorated, a low molecular weight linear compound is contained. Therefore, even in the initial state, the linear compound having a low molecular weight to some extent evaporates.

  Therefore, the degradation state can be accurately grasped by analyzing the cyclomer.

  However, with the technologies described in the above-mentioned patent documents, the low molecular weight and the low molecular weight generated by the thermal deterioration of the silicone fluid during operation of the electrical device, which is important for the prevention and maintenance of the electrical device containing the silicone fluid as the insulation and cooling medium The component of the cyclic compound, which is a decomposition product of boiling point, could not be easily analyzed and quantified on site.

  That is, the main component of the low molecular weight, low boiling point decomposition product generated by thermal degradation of the silicone liquid is a cyclic compound having the same basic chemical structure as the silicone liquid. For this reason, it is difficult to selectively analyze and quantify a cyclic compound that is a decomposition product of the silicone liquid in the silicone liquid.

  Therefore, it is difficult to easily analyze and quantitate the components of the cyclic compounds of decomposition products generated by thermal degradation of the silicone fluid during the operation of the electrical equipment containing the silicone fluid as the insulation / cooling medium. The preventive maintenance of electrical equipment could not be easily performed on site.

  The object of the present invention is to enable efficient and simple quantification of low molecular weight and low boiling point cyclic compounds generated by thermal degradation in silicone fluids used as insulation / cooling media for electrical equipment containing silicone fluids on-site. Measurement of cyclic compounds in silicone fluids used in electrical equipment containing silicone fluid, transformers containing silicone fluid, and electrical equipment containing silicone fluid, which facilitates preventive maintenance of electrical equipment that uses silicone fluid as an insulation and cooling medium It is to provide a method.

The silicone-liquid-containing electric device of the present invention is a silicone-liquid-containing electric device having a tank containing an electric device therein, and a silicone liquid containing an insulating cooling medium housed in the tank and insulating and cooling the electric device. A collection pipe for collecting the liquid, a gas component collection container for heating and evaporating the cyclic compound contained in the silicone liquid by heating the silicone liquid collected by the collection pipe, and a ring collected by the gas component collection container A gas analyzer for analyzing a compound , wherein the gas component collection container has a function of collecting a predetermined amount of silicone liquid, and further has a function of heating the silicone liquid to 100 to 220 ° C. The analyzer determines the trimer, tetramer, and pentamer produced by the decomposition of the silicone liquid from the gas components evaporated in the gas component collection container. Analysis, characterized in that.

Further, the transformer with silicone liquid according to the present invention includes a tank containing therein an iron core and a winding attached to the iron core, and a silicone liquid for insulating and cooling the iron core and the winding housed in the tank. In the transformer containing silicone liquid, a sampling pipe for collecting the silicone liquid, a gas component collection container for heating the silicone liquid collected by the sampling pipe and vaporizing the cyclic compound in the silicone liquid, and the gas Equipped with a gas analyzer that analyzes the cyclic compound collected in the component collection container ,
The gas component collection container has a function of collecting a predetermined amount of silicone liquid, and further has a function of heating the silicone liquid to 100 to 220 ° C., and the gas analyzer is the gas component collection container. It is characterized by quantitatively analyzing trimers, tetramers, and pentamers generated by decomposition of the silicone liquid from the vaporized gas components .

The measurement method of the cyclic compound of the silicone fluid used in the silicone fluid containing electrical equipment of the present invention comprises a tank containing the electrical device therein, the silicone for cooling and insulating the electrical device housed within said tank met method of measuring the cyclic compound contained in the silicone liquid that is used in the liquid-filled electrical device, the gas said cyclic compound by heating the silicone fluid as the heating temperature of the silicone fluid is 100 to 220 ° C. However, trimer silicone fluid from said vaporized gas is generated by decomposition, tetramer, characterized by quantitative analysis of pentamer.

Further, the maintenance method of the electrical equipment containing silicone liquid according to the present invention is a maintenance method of the electrical equipment containing silicone liquid having a tank containing the electrical device therein and a silicone fluid for insulating and cooling the electrical device, During operation of the electrical equipment containing the silicone liquid, the silicone liquid in the tank is collected, and the collected silicone liquid is heated so that the heating temperature of the silicone liquid is 100 to 220 ° C. The cyclic compound contained is vaporized, and the trimer, tetramer, and pentamer produced by decomposition of the silicone liquid from the vaporized gas are quantitatively analyzed .

  Examples of the electrical equipment using the silicone liquid include a transformer including a current transformer for an instrument, a reactor, a voltage regulator, a capacitor, and a resistor. In addition, examples of the electric device used in the above-described electric apparatus containing a silicone liquid and immersed in the silicone liquid include an iron core and a wound wire.

  According to the present invention, a low molecular weight, low boiling point cyclic compound produced by thermal degradation of a silicone fluid used as an insulating / cooling medium for an electrical device containing a silicone fluid can be quantified efficiently and simply on site. Of silicone liquids that use silicone fluids as insulation / cooling media to facilitate preventive maintenance of electrical devices containing silicone fluids, transformers containing silicone fluids, and cyclic compounds in silicone fluids used in electrical devices containing silicone fluids A measurement method can be realized.

  Next, an electrical apparatus containing a silicone liquid according to an embodiment of the present invention will be described with reference to the drawings.

  As an example of the electrical equipment containing silicone liquid of the present invention, the configuration of a transformer containing silicone liquid will be described. FIG. 1 shows a configuration of a transformer containing silicone liquid according to an embodiment of the present invention. The transformer containing silicone liquid includes a tank 1, an iron core 2 disposed inside the tank 1, and an iron core 2. Are provided with an inner winding 3, an outer winding 4, and an insulating cylinder 5, respectively.

  Inside the tank 1, a silicone liquid 6 as an insulating / cooling medium for insulating and cooling the iron core 2, the inner winding 3 and the outer winding 4, and a nitrogen gas existing above the silicone liquid 6 7 are accommodated.

  A cooler 8 is provided outside the tank 1 for cooling the insulating / cooling medium silicone liquid 6 housed in the tank 1. The tank 1 and the cooler 8 are provided with an upper portion and a lower portion. Are connected through cooling pipes 9a and 9b, respectively.

  The insulating / cooling medium silicone liquid 6 contained in the tank 1 is a polymer of an organosilicon compound, and has a linear structure having a chemical structural formula shown in the following formula (1) or (2): It is this compound. Although sometimes referred to as silicone oil, they are basically the same. These may be used alone or mixed, but it is preferable to use a dimethyl silicone liquid represented by the formula (1).

  The insulating / cooling medium silicone fluid 6 contained in the tank 1 flows from the inside of the tank 1 to the inside of the cooler 8 through the upper cooling pipe 9 a as indicated by the arrow, and is cooled by the cooler 8. After that, it is sent again from the cooler 8 to the inside of the tank 1 through the lower cooling pipe 9b to cool the iron core 2, the inner winding 3 and the outer winding 4 provided in the tank 1, It functions to take away Joule heat generated from the iron core 2, the inner winding 3, and the outer winding 4.

  The iron core 2 is clamped and held by fastening metal fittings 10a and 10b attached to the upper part and the lower part, respectively.

  Insulators 11 and 12 are installed above the inner winding 3 and the outer winding 4, respectively, and insulators 13 and 14 are also installed below the inner winding 3 and the outer winding 4, respectively. Further, a cooling oil introducing portion 15 for cooling the iron core 2 is formed on the center side of the iron core 2.

  In the transformer with silicone liquid of the present embodiment, a low molecular weight, low boiling point cyclic compound generated by thermal degradation of the silicone liquid 6 as an insulating / cooling medium is heated on the liquid surface of the silicone liquid 6 by heating the silicone liquid 6. In order to evaporate and vaporize the gas phase portion and analyze it as a gas component, a decomposition product analyzer having the following configuration is provided.

  That is, a pipe 16 that is disposed in the lower part of the tank 1 and collects the silicone liquid 6 inside the tank 1 and a silicone liquid 6 that is installed and connected to the pipe 16 is heated to collect a gas component. A gas component collecting container 17 for connecting to the gas component collecting container 17, a gas pipe 18 for guiding the gas component collected from the silicone liquid 6 from the gas component collecting container 17, and a gas pipe 18 connected thereto. This decomposition product analyzing apparatus is composed of a gas analyzing apparatus 19 for analyzing a gas component collected from the installed and guided silicone liquid 6.

  In addition, a heater 20 for heating the silicone liquid 6 is provided outside the gas component collection container 17 in order to evaporate and vaporize the cyclic compound in the collected silicone liquid 6. In the gas component collecting container 17, the heating temperature for evaporating and vaporizing the low molecular weight, low boiling point cyclic compound generated by thermal degradation by heating the internal silicone liquid 6 with the heater 20 is about 100 ° C. to 220 ° C., preferably It is set to about 150 ° C to 200 ° C.

  FIG. 2 is a characteristic diagram showing the relationship between the heating temperature of the silicone liquid and the ionic strength of the cyclic polymer. FIG. 2 shows the results of examining the evaporation / vaporization behavior of each of the trimer, tetramer, and pentamer components when the temperature of the silicone liquid is increased in order to analyze the cyclic polymer as an indicator of deterioration. .

  Observation was performed by evolved gas analysis (EGA-MS: Evolved Gas Analysis-Mass Spectrometry).

  In order to increase the measurement sensitivity, the sample was not a heat-degraded product of the silicone liquid, but a dimethyl silicone trimer (D3), tetramer (D4), or pentamer (D5) added to the silicone liquid. . After the sample is placed in the cell, it is stabilized in a He atmosphere, the sample is heated from 50 ° C. at a heating rate of 10 ° C./min, and the gas continuously generated up to 300 ° C. is transferred to a mass spectrometer. Introduced.

As the characteristic ions corresponding to each of the cyclic isomers D3, D4, and D5, those having M / Z values of 207, 281, and 355 are selected, and each ionic strength and its total ion current (Total) are selected.
Ion Current) was measured. The result of heating the silicone liquid in a He atmosphere to 50 to 300 ° C., displaying the M / Z value 207 with a one-dot chain line, displaying the M / Z value 281 with a solid line, and displaying the M / Z value 355 with a broken line. As shown in FIG.

  For all the cyclic isomers, evaporation and vaporization started at about 80 to 90 ° C., and all the cyclic isomers were released at about 220 ° C. Therefore, the heating temperature can be about 100 ° C. to 220 ° C.

  In addition, the observation time can be shortened by heating to 150 ° C. to 220 ° C., and the measurement can be performed efficiently. In addition, when it was made higher than 230-250 degreeC, the cyclic body was detected again. This is considered to be due to the decomposition of the silicone liquid and the evaporation / vaporization of the decomposition products by raising the temperature.

  In the transformer gas component collection container 17 containing the silicone liquid shown in FIG. 1, a predetermined amount of the silicone liquid 6 accommodated in the gas component collection container 17 is heated by the heater 20, thereby generating heat degradation of the silicone liquid 6. The low molecular weight and low boiling point cyclic compound is evaporated and vaporized in the gas phase portion on the silicone liquid surface inside the gas component collection vessel 17 to form a gas component.

  As a means for collecting a predetermined amount of silicone liquid, for example, there is provided a means for collecting a substantially constant amount of silicone liquid by opening the valve (21a) for a certain period of time and measuring the weight of the collected silicone liquid. It is done.

  The gas component of the cyclic compound generated by the thermal deterioration of the silicone liquid 6 evaporated and vaporized in the gas phase portion inside the gas component collection container 17 by heating is sent to the gas analyzer 19 through the gas pipe 18, and this gas analyzer. The gas component of the low-molecular-weight, low-boiling cyclic compound generated by thermal degradation by 19 is analyzed and quantified on-site during operation of the transformer with silicone liquid.

  Examples of means for extracting the cyclic compound from the gas component collection container to the gas analyzer include flowing an inert gas such as nitrogen, helium, or argon.

  In addition, an adsorbent that can be heated by a heater is installed inside the gas component collection container 17, and after the vaporized and vaporized cyclic compound gas component is once adsorbed in the gas phase portion, the adsorbent is heated and vaporized. The cyclic compound can be efficiently taken out by introducing the gas component of the cyclic compound into the gas analyzer using an inert gas.

  In addition, it is possible to diagnose deterioration based on the results obtained from the gas analyzer by associating the quantities of trimer, tetramer, and pentamer with the characteristics of the deterioration state such as the flash point of the silicone liquid in advance. It is.

  For example, when the analysis value obtained from the gas analysis result or the calculated amount of the cyclic compound becomes a predetermined value or more, it is determined that the silicone liquid has deteriorated.

  The determination device that performs the diagnosis can be configured, for example, to transmit the measurement result of the gas analyzer to a monitoring device or a storage unit through a signal line, and monitor the amount of the cyclomer obtained from the gas analysis result. .

  A schematic diagram of the monitor screen of the monitoring device is shown in FIG. FIG. 3 plots the amount of cyclomer obtained from the gas analyzer with respect to the operating time, and a predetermined value (broken line) of the cyclomer amount appropriately set in advance to determine the deterioration of the silicone liquid. It is shown.

  When the deterioration of the silicone liquid is not progressing, the amount of the cyclic monomer is not more than the value indicated by the broken line, and the deterioration of the silicone liquid can be easily determined by checking the monitor screen.

  If it is determined that the silicone fluid has deteriorated, stop the operation of the device, check for abnormalities in the daily inspection items, collect the silicone fluid, and further analyze the condition.

  In addition, when the equipment is stopped at the time of periodic inspection or the like according to the degree of deterioration, it is possible to prevent the transformer from being broken by replacing part or all of the silicone liquid.

  In addition, when the deterioration is diagnosed, management can be facilitated by providing means for notifying the deterioration of the silicone liquid.

  For example, an alarm device or the like may be provided that determines that the silicone liquid has deteriorated and issues an alarm when the amount of the cyclomer exceeds a predetermined value.

  The frequency of confirming the deterioration of the silicone fluid in the electrical equipment is once a week, once a month, or the like. Therefore, it is possible to provide a control device that starts the determination of the deterioration every predetermined period.

  The control device operates the pump at a predetermined cycle to take the silicone liquid in the tank into the gas component collection container, starts heating the silicone liquid, and activates the gas analyzer.

  First, the valve is opened, the silicone fluid is collected from the collection pipe connected to the tank, the valve is closed, the heater is activated, and a certain amount of silicone fluid is heated in the gas component collection container to Collect body.

  After analyzing the amount of cyclomer, the heater is stopped and the components remaining in the analyzer are purified. Since the silicone liquid has few decomposition products, it may be returned to the tank without being discharged out of the system. Further, since the amount of the silicone liquid to be measured is small (eg, 50 ml), it may be discarded.

  It is also possible to monitor a plurality of electrical devices such as transformers with a single gas analyzer and determination device.

  As described above, since the frequency of confirmation of deterioration is once a week or once a month, an electrical device system having several electrical devices and a pipe switching device for one analyzer may be used.

  Each silicone fluid can be collected from a plurality of electrical devices, and the state of deterioration of the silicone fluid of each electrical device can be grasped.

  When the silicone liquid used for one determination is large, the amount of gas obtained is easy when the silicone liquid is large, and when the silicone liquid is small, the silicone liquid is easily heated.

  It is preferably 1 to 50 ml, and sufficient measurement is possible even with about 1 to 5 ml. Since the silicone liquid remaining in the component collection container after determination does not have a low molecular weight compound that lowers the flash point, it can be returned to the tank and reused.

  At that time, it is preferable to provide a return pipe for returning the silicone liquid to the tank and a pump for circulating the silicone liquid in the pipe.

  The pump can be controlled together by the control device described above. In addition, it is good also as a structure which discards the silicone liquid after determining deterioration and replenishes as needed.

  According to the transformer with silicone liquid having the above-described configuration, it is generated by thermal deterioration of the silicone liquid 6 as an insulating / cooling medium accommodated in the tank 1 during operation of the transformer, and is dissolved in the silicone liquid 6. Since the cyclic compound is vaporized and vaporized in the gas phase portion on the liquid surface of the silicone liquid 6 by heating the silicone liquid 6 and analyzed as a gas, it is generated by the thermal deterioration of the silicone liquid 6. Since the cyclic compound can be quantified efficiently and simply on site, preventive maintenance of the transformer containing the silicone liquid can be easily achieved.

Silicone liquid 6 as an insulating / cooling medium used in a transformer containing silicone liquid circulates between tank 1 and cooler 8 via cooling pipes 9a and 9b connected to both, and is cooled by cooler 8. The viscosity of the silicone fluid 6 is such that the silicone fluid 6 is supplied to the iron core 2, the inner winding 3 and the outer winding 4 installed in the tank 1 to cool these devices. Is preferably lower, and in particular, those having a kinematic viscosity coefficient at 25 ° C. of 50 mm ² / s or less are preferred.

  In general, the flash point of the silicone fluid 6 depends on its molecular weight, and the smaller the molecular weight, the lower the viscosity of the silicone fluid 6. Therefore, it is considered that the lower the viscosity, the lower the flash point of the silicone liquid 6 and the more products of low molecular weight and low boiling point decomposition products due to thermal decomposition.

  In order to improve the fire resistance of the transformer or to make the equipment more compact by increasing the operating temperature, the silicone fluid 6 is preferably flame retardant, and particularly has a flash point exceeding 250 ° C. It is preferable that

Therefore, as the silicone liquid 6 as an insulating / cooling medium used for a transformer containing silicone liquid, a silicone liquid 6 having a flash point of more than 250 ° C. and a kinematic viscosity coefficient at 25 ° C. of 50 mm ² / s or less is effective. is there.

  In addition, you may make it add additives, such as an antistatic agent currently used with the transformer containing mineral oil, to the silicone liquid 6 of a present Example.

  According to this example, low molecular weight and low boiling point cyclic compounds produced by thermal degradation of silicone fluids used as insulation and cooling media for electrical equipment containing silicone fluids can be quantified efficiently and simply on site. In the silicone fluid used in the electrical equipment containing silicone fluid, the transformer containing silicone fluid, and the electrical equipment containing silicone fluid, which facilitated preventive maintenance of electrical equipment that uses silicone fluid as insulation and cooling medium. A method for measuring a cyclic compound can be realized.

  Next, the configuration of a transformer with silicone liquid according to another embodiment of the present invention will be described with reference to FIG. In the transformer of the silicone liquid transformer of this embodiment shown in FIG. 4, the gas component collection container 17 is disposed via a pipe 16 communicating with a cooling pipe 9 b installed at the lower part of the cooler 8. It has a configuration. Since the piping 16 for collecting the silicone liquid 6 is installed so as to communicate with the cooling piping 9b without directly communicating with the tank 1, the piping 16 can be arranged more simply.

  The configuration of the transformer with silicone liquid of the present embodiment shown in FIG. 4 is the same as the basic configuration of the transformer with silicone liquid of the first embodiment shown in FIG. Is omitted.

  Also, a low molecular weight, low boiling point cyclic compound generated by thermal degradation of the silicone fluid 6 as an insulating / cooling medium during operation of the transformer with silicone fluid according to this embodiment in FIG. 4 can be analyzed and quantified on-site. Since this is the same as the first embodiment shown in FIG. 1, the description thereof is omitted here.

  Also in the present embodiment described above, as in the previous embodiment described in FIG. 1, a low molecular weight, low boiling point ring produced by thermal degradation of a silicone fluid used as an insulating / cooling medium for an electrical device containing a silicone fluid. Silicone fluid-containing electrical devices, silicone fluid-containing transformers, and silicones that enable compounds to be quantified efficiently and simply on-site to facilitate preventive maintenance of electrical devices that use silicone fluids as insulation and cooling media A method for measuring a cyclic compound in a silicone liquid used in a liquid-filled electrical device can be realized.

  FIG. 5 shows another example of an electric device containing a silicone liquid. In this example, the silicone liquid is circulated in the analyzer. In the present embodiment, the collection port for the silicone liquid is the tank body (1), and the discharge port is the pipe (9b) of the cooler. The pump for circulation was omitted.

  Open the valve (21a, 21b) to circulate the silicone liquid in the piping of the analyzer, and close the valve when the internal silicone liquid is sufficiently replaced with the one at the time of measurement, and inside the gas component collection container (17) A predetermined amount of the silicone liquid is heated to measure the amount of the cyclic monomer.

  Since the silicone liquid after the measurement only has a reduced cyclomer, the valve can be opened and returned to the tank.

  Although the silicone liquid may be collected from the cooling pipe (9b), it is efficient to collect from the cooling pipe (9a) or the upper part of the tank body in order to reduce heating during analysis.

  In addition, since the cooling pipe has a high flow rate of the silicone liquid, circulation is generated by using the discharge port as a pipe, and a part of the pump can be omitted, which is preferable.

  Further, in this embodiment, a function for notifying the diagnosis result is added. The measurement result of the gas analyzer is transmitted to the alarm device, the monitoring device and the storage unit via the terminal box (23) by the signal line (22), the alarm signal line (25) and the constant monitoring signal line (26). The

  The administrator can check the deterioration state of the silicone liquid and manage the device. For example, an alarm device or the like may be provided that determines that the silicone liquid has deteriorated and issues an alarm when the amount of released cyclomer exceeds a predetermined value set in advance.

  The set value is set by examining measured values obtained from the deteriorated silicone liquid and characteristics such as electric conductivity and ignition temperature.

  In addition, although a well-known thing can be employ | adopted for a valve | bulb and an alarm device suitably, the valve | bulb is open | released when a power supply stops, and the alarm | alarm is turned ON.

  Next, an example of an operation pattern of an electric device containing a silicone liquid provided with a gas analyzer will be described. Diagnosis by the gas analyzer can be performed at a set frequency such as once a week or once a month, or at all times.

  Hereinafter, an example of diagnosis using a control device performed for each cycle will be described. The operation of the gas analyzer is mainly divided into four stages: measurement preparation, measurement, cleaning, and steady state.

  The time required for each stage in Table 1 can be adjusted as appropriate according to the configuration of the piping, the frequency of inspection of the silicone liquid, the period of use of the silicone liquid, and the like. In addition, when measuring every certain period of time, it is possible to monitor each electrical device by switching the flow path of the piping by connecting multiple electrical devices and one analyzer with piping. It is.

  In the measurement preparation stage, the pump and valve are opened, and the silicone fluid in the collection pipe connected to the tank and the gas component collection container for collecting the silicone fluid is circulated. In the measurement stage, the pump and the valve are closed, the heater is operated, the silicone liquid collected in a certain amount in the gas component collection container is heated, and the cyclomer is collected.

  In the cleaning stage, the heater is stopped to purify and remove the components remaining in the analyzer and the like and the silicone liquid. Since the silicone liquid after diagnosis is free of ring products and the like, and has a reduced decomposition product, it may be returned to the tank without being discharged out of the system. Moreover, since the amount of the silicone liquid to be measured is a small amount (about 1 to 50 ml), it may be discarded.

  Based on the information detected at the time of measurement, control the means to inform the administrator of the deterioration of the silicone fluid and the means to stop the operation of the electrical equipment containing silicone fluid to efficiently prevent equipment malfunction and preventive maintenance It becomes possible.

  The present invention provides a silicone liquid that can efficiently and easily quantitate a low molecular weight, low boiling point cyclic compound produced by thermal degradation in a silicone liquid used as an insulating / cooling medium for an electrical device containing a silicone liquid, on-site. For measuring the cyclic compounds in silicone fluid used in electrical equipment containing silicone fluid, transformers containing silicone fluid, and electrical equipment containing silicone fluid Can be applied.

The schematic diagram which shows the structure of the transformer containing a silicone liquid which is one Example of this invention. The characteristic view which shows the relationship between the heating temperature of a silicone liquid, and the ionic strength of a cyclic body. The schematic diagram of the monitor screen of a monitoring apparatus. The schematic diagram which shows the structure of the transformer containing a silicone liquid which is the other Example of this invention. The schematic diagram which shows the structure of the transformer containing a silicone liquid which is the other Example of this invention. An example in which a silicone liquid is circulated in the analyzer.

Explanation of symbols

  1: tank, 2: iron core, 3: inner winding, 4: outer winding, 5: insulating cylinder, 6: insulating cooling medium, 7: nitrogen, 8: cooler, 9a, 9b: cooling pipe, 10a, 10b : Fastening brackets 11, 12, 13, 14: Insulator, 15: Oil introduction part, 16a, 16b: Piping, 17: Gas component collection container, 18: Gas piping, 19: Gas analyzer, 20: Heater, 21a, 21b: valve, 22: signal line, 23: terminal box, 24: power line, 25: alarm signal line, 26: constant monitoring signal line.

Claims (14)

In a tank containing an electrical device and an electrical device containing silicone fluid having a silicone fluid that insulates and cools the electrical device accommodated in the tank,
A sampling pipe for collecting the silicone liquid, a gas component sampling container for heating and evaporating the cyclic compound contained in the silicone liquid by heating the silicone liquid collected by the sampling pipe, and the gas component collecting container A gas analyzer for analyzing the cyclic compounds ,
The gas component collection container has a function of collecting a predetermined amount of silicone liquid, and further has a function of heating the silicone liquid to 100 to 220 ° C.
The gas analyzer is configured to quantitatively analyze a trimer, a tetramer, and a pentamer generated by decomposing a silicone liquid from gas components evaporated and vaporized in the gas component collection container. Entered electrical equipment.   2. The electrical apparatus containing silicone liquid according to claim 1, further comprising a determination device for determining a degree of deterioration of the silicone liquid based on information obtained from the gas analyzer.   3. The electrical apparatus with silicone fluid according to claim 2, further comprising an alarm device for notifying deterioration of the silicone fluid based on information of the determination device.   2. The electrical equipment containing silicone liquid according to claim 1, wherein the electrical device has an iron core and a winding. In the electrical equipment with silicone liquid according to claim 1,
An electric device containing silicone liquid, comprising: a return pipe for returning the silicone liquid remaining in the component collection container to the tank; and a pump for circulating the silicone liquid through the return pipe . In the electrical equipment with silicone liquid according to claim 5,
A control device that operates or stops the pump at a predetermined cycle, and the control device has a function of heating the gas component collection container when the pump is stopped and analyzing the gas by the gas analyzer. Characterized electrical equipment with silicone fluid . In the electrical equipment containing silicone liquid according to claim 1,
A cooling pipe for cooling the silicone liquid in the tank, and a cooling pipe for circulating the silicone liquid disposed between the tank and the cooler, and a piping for collecting the silicone liquid communicated with the cooling pipe A silicone liquid-containing electrical device characterized by comprising: In the electrical equipment containing silicone liquid according to claim 1,
The silicone liquid has a flash point of 250 ° C. or higher and a kinematic viscosity coefficient at 25 ° C. of 50 mm ² / s or less . In a transformer containing silicone liquid, comprising: a tank containing therein an iron core and a winding attached to the iron core; and a silicone liquid filled in the tank for insulating and cooling the iron core and the winding;
A sampling pipe for collecting the silicone liquid, a gas component collection container for heating the silicone liquid collected by the sampling pipe and vaporizing the cyclic compound in the silicone liquid, and a cyclic compound collected by the gas component collection container Equipped with gas analyzer to analyze,
The gas component collection container has a function of collecting a predetermined amount of silicone liquid, and further has a function of heating the silicone liquid to 100 to 220 ° C.
The gas analyzer is configured to quantitatively analyze a trimer, a tetramer, and a pentamer generated by decomposing a silicone liquid from gas components evaporated and vaporized in the gas component collection container. Incoming transformer . In the transformer with silicone liquid according to claim 9,
The transformer with silicone liquid, wherein the sampling pipe is directly connected to the tank . In the transformer with silicone liquid according to claim 9,
A cooler for cooling the silicone liquid; a cooling pipe disposed between the tank and the cooler for circulating the silicone liquid; and a sampling pipe disposed to communicate with the cooling pipe. A transformer with silicone liquid characterized by the above . In the transformer with silicone liquid according to claim 9,
A silicone liquid transformer, wherein the silicone liquid has a flash point of 250 ° C. or more and a coefficient of kinematic viscosity at 25 ° C. of 50 mm ² / s or less . A method for analyzing a cyclic compound contained in a silicone liquid used in a tank containing an electric device and a silicone liquid-containing electric device for insulating and cooling the electric device housed in the tank,
Heating the silicone liquid to vaporize the cyclic compound so that the heating temperature of the silicone liquid is 100 to 220 ° C.,
A method for measuring a cyclic compound in a silicone liquid, comprising quantitatively analyzing a trimer, a tetramer, and a pentamer produced by decomposition of a silicone liquid from the vaporized gas . A maintenance method for electrical equipment containing silicone liquid, comprising: a tank containing an electrical apparatus therein; and a silicone liquid for insulating and cooling the electrical apparatus,
During operation of the electrical equipment containing the silicone fluid, the silicone fluid in the tank is collected,
Heating the collected silicone liquid so that the heating temperature of the silicone liquid is 100 to 220 ° C. to vaporize a cyclic compound contained in the silicone liquid;
A method for maintaining an electrical device containing silicone liquid, comprising quantitatively analyzing a trimer, tetramer, and pentamer produced by decomposition of a silicone liquid from the vaporized gas .

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