KR20080070581A - Electrical machine silicone liquid of brazing diagnosis apparatus and method - Google Patents

Abstract

A diagnosis apparatus of deterioration of silicone liquid and a diagnosis method thereof are provided to accurately analyze the thermal deterioration of silicone liquid used as a coolant. A diagnosis apparatus of deterioration of silicone liquid includes a pipe(16a), a gas collecting container(17), a gas pipe(18), a gas analyzer(19), a determinator(30), and a display device(32). The pipe collects the silicone liquid in a tank(1). The gas collecting container collects gas included the silicone liquid by heating the silicone liquid. The gas pipe is connected with the gas collecting container and introduces the gas into the gas collecting container. The gas analyzer analyzes the gas supplied from the gas collecting container. The determinator determines the deterioration of the silicone liquid. The display device displays the deterioration of the silicone liquid.

Description

ELECTRICAL MACHINE SILICONE LIQUID OF BRAZING DIAGNOSIS APPARATUS AND METHOD}

The present invention relates to an apparatus for diagnosing deterioration of a silicone liquid for an electric apparatus and a method for diagnosing deterioration of a silicone liquid for an electrical apparatus using the silicone liquid as the insulation and cooling medium.

Conventionally, insulating oils, such as mineral oil, have been used for the insulation and cooling medium of an electric device using insulation and a cooling medium.

By using the flame-retardant silicone liquid as the insulation of the transformer and the cooling medium instead of the mineral oil, the fire resistance of the transformer can be improved, and the operating temperature can be increased, thereby making the electric equipment more compact.

However, in the case of using the silicon liquid as the insulation and cooling medium, if the operating temperature of the electric equipment is higher than in the prior art, low molecular weight and low boiling point decomposition products are generated due to thermal degradation of the silicon liquid.

When a large amount of this decomposition product is formed in the silicone liquid, the flashing temperature (hereinafter referred to as a flash point) of the silicone liquid is lowered, so that the silicone liquid tends to be flammable. The amount of this decomposition product increases as the operating temperature of the electric equipment increases.

Japanese Patent Application Laid-open No. Hei 10-332682 discloses a technique for evaluating the degree of deterioration of electrical insulating oil by heating the electrical insulating oil used in an inflow electrical equipment to measure the number of chemical luminescence.

Japanese Unexamined Patent Publication No. 3-187206 discloses a tank structure in which a plurality of gas detectors are arranged on the top of a tank of an inflow electric device such as an inflow transformer, an inflow reactor, and the generated combustible gas is efficiently introduced into each gas detector. A technique for reliably detecting an abnormality such as insulation breakdown or localized heating of an electric device is disclosed.

Japanese Unexamined Patent Publication No. 59-176683 measures the thermogravimetric characteristics of the silicone liquid for electrical insulation, obtains the heat-resistance index TGI (° C) from the characteristic curve, and when the silicon liquid reaches a predetermined value (325 ° C) or less, Techniques for determining this deterioration are disclosed.

Japanese Patent Application Laid-Open No. 54-114290 discloses a technique for analyzing a gas component in insulating oil by gas phase extraction by bubbling at room temperature in an insulated electric equipment.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 10-332682

[Patent Document 2]

Japanese Patent Application Laid-Open No. 3-187206

[Patent Document 3]

Japanese Patent Application Laid-Open No. 59-176683

[Patent Document 4]

Japanese Patent Application Laid-Open No. 54-114290

When the silicone liquid is thermally deteriorated, a cyclic polymer is produced, and its main components are trimers, tetramers, and pentamers. It is known that as deterioration proceeds, the amount of cyclic polymer produced increases. Terpolymers, tetramers, and pentamers are low in boiling point and easy to evaporate. Almost no cyclic polymer is included in the undegraded initial state.

Deterioration also produces low molecular weight straight chain compounds. However, even in the initial state without deterioration, low molecular weight straight chain compounds are included. Therefore, even in the initial state, the molecular compound of a low molecular weight evaporates to some extent.

The above-mentioned Patent Document 3 extracts a certain amount of the silicone liquid, heats it with a constant temperature gradient to evaporate the low molecular weight compound, and the index of deterioration at the heating temperature when the weight is reduced by 10% and 20%. However, since the silicon liquid contains a low molecular weight straight chain compound even in the initial state, there is a problem that the determination of deterioration is insufficient from the weight loss amount, that is, the evaporation amount.

The temperature at which the weight decreases by 20% may be from 350 ° C to 370 ° C, and at such a high temperature, the normal silicone liquid decomposes into a low molecular compound, which is considered to adversely affect the determination of thermal degradation.

The present inventors have experimentally confirmed that the low molecular weight cyclic polymer produced in the silicone liquid can be used as an index of thermal deterioration, and the present invention has been achieved.

In other words, it is possible to accurately grasp the state of thermal degradation by quantitatively analyzing the cyclic polymer in the silicone liquid.

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

DISCLOSURE OF THE INVENTION An object of the present invention is to insulate an electrical device containing silicone fluid and to make it possible to accurately and easily diagnose thermal degradation of a silicone fluid used as a cooling medium. The present invention provides a method for diagnosing degradation of a liquid.

An apparatus for diagnosing deterioration of a silicone liquid for an electric apparatus of the present invention includes an electrical apparatus, a tank accommodating the electrical apparatus therein, a silicone liquid stored in the tank to insulate and cool the electrical apparatus, and a silicone liquid in the tank. A sampling pipe for collecting a portion of the sample to the outside of the tank, a gas component collecting container for heating and evaporating a cyclic compound contained in the silicon liquid by heating the silicon liquid collected in the collecting pipe, and evaporating from the gas component collecting container. A gas analyzer for quantitatively analyzing the vaporized cyclic compounds, a judgment device for determining the thermal degradation state of the silicone liquid based on the analysis values of the cyclic compounds analyzed by the gas analyzer, and a ring analyzed by the gas analyzer And a display device for displaying an analysis value of the shaped compound and / or a thermal degradation state of the silicone liquid determined by the determination device. It shall be.

In addition, the method for diagnosing the deterioration of the silicone liquid for electric equipment of the present invention is the method for deteriorating the diagnosis of the silicone liquid for electrical equipment contained in the tank and insulated and cooled by the silicon liquid stored in the tank. A part of the silicon liquid in the sample is taken out of the tank through a collecting pipe, and the collected silicon liquid is supplied to a gas component collecting container, and heated in the gas component collecting container to evaporate the cyclic compound contained in the silicone liquid. The vaporized and vaporized cyclic compound was supplied to a gas analyzer and quantitatively analyzed by the gas analyzer, and based on the analysis value of the cyclic compound analyzed by the gas analyzer, the determination device deteriorated the silicon liquid. Of the cyclic compound analyzed by the gas analyzer and / or the silicon liquid determined by the determination device. It is characterized in that the deterioration situation is displayed on the display device.

According to the present invention, since the low molecular weight, low boiling point cyclic compound produced by the insulation of the electrical equipment containing the silicone liquid and the thermal degradation of the silicone liquid used as the cooling medium can be easily and efficiently measured on site, Device for diagnosing deterioration of silicone fluid for electrical equipment and method for diagnosing deterioration of silicone fluid for electrical equipment, which makes it possible to accurately and easily diagnose thermal deterioration of silicone liquid used as insulation and cooling medium containing silicone liquid. Can be realized.

Next, an apparatus for diagnosing deterioration of a silicone liquid and a method for diagnosing the deterioration of a silicone liquid of an electrical apparatus containing a silicone liquid of an embodiment of the present invention will be described with reference to the drawings.

(Example 1)

As an example of an electrical apparatus containing silicon liquid which is an embodiment of the present invention, the configuration of a transformer containing silicon liquid will be described.

1 shows a configuration of a diagnostic apparatus for deterioration of a transformer containing silicon liquid according to an embodiment of the present invention, wherein the transformer containing silicon liquid includes a tank 1 and an iron core disposed inside the tank 1 ( 2), the inner winding 3 and the outer winding 4 attached to the iron core 2, and the insulating cylinder 5 are provided, respectively.

Inside the tank 1 there is an insulating, silicon fluid 6 of the cooling medium and an insulating material for insulating and cooling these iron cores 2, the inner windings 3 and the outer windings 4, The nitrogen gas 7 existing above is accommodated.

Outside the tank 1, a cooler 8 for cooling the silicon liquid 6 of the insulation and cooling medium contained in the tank 1 is provided. The tank 1 and the cooler 8 are provided. Are connected via cooling pipes 9a and 9b respectively provided at the upper and lower portions thereof.

The silicon liquid 6 of the insulation and cooling medium contained in the tank 1 is a polymer of an organosilicon compound, and is a linear compound having a chemical formula represented by the following general formula (1) or (2). . Sometimes called silicone oil, but basically they are the same. Although these may be used independently or may be mixed, it is preferable to use the dimethyl silicone liquid shown by General formula (1).

The silicone liquid 6 of the insulating and cooling medium 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 9a as indicated by the arrow. After cooling in the cooler (8), it is sent from the cooler (8) to the inside of the tank (1) again through the lower cooling pipe (9b), the iron core (2) provided inside the tank (1), the inner winding ( 3) It cools the outer winding (4) and functions to take away Joule's heat generated in the iron core (2), the inner winding (3) and the outer winding (4).

The iron core 2 is tightened and held by fastening metal fasteners 10a and 10b respectively provided at the upper and lower portions thereof.

Insulators 11 and 12 are respectively provided on the upper side of the inner winding 3 and the outer winding 4, and insulators 13 and 14 are also provided on the lower portions of the inner winding 3 and the outer winding 4, respectively. It is. Moreover, the cooling liquid introduction part 15 which cools the iron core 2 is formed in the center side of the iron core 2.

In the transformer containing the silicon liquid of the present embodiment, a low molecular weight, low-boiling cyclic compound produced by thermal deterioration of the silicon liquid 6 of the insulation and cooling medium is heated by heating the silicon liquid 6 to obtain the silicon liquid 6 In order to analyze as a gas component by evaporating and vaporizing in the gaseous part of the liquid level, the decomposition product analyzer which consists of the following structures is provided.

That is, the pipe 16 which is provided in the lower part of the tank 1, and collect | recovers the silicon liquid 6 inside the tank 1, and the silicon liquid 6 which was installed and connected to this piping 16, are heated. The gas component collection container 17 connected to the gas component collection container 17 and the gas component collection container 17 for evaporating the gas component and heat-evaporating the silicon liquid 6 to collect the gas component collection container 17 A gas analyzer (19) for analyzing gas components extracted from the silicon pipe (6) installed and connected to the gas pipe (18) guided from the gas pipe (18), and the gas analyzer (19). Is determined by the determination device 30 for determining the deterioration state of the silicone liquid based on the comparison of the gas component analyzed with the reference value of deterioration and the gas component or determination device 30 analyzed by the gas analyzer 19. A display apparatus 32 for displaying the deterioration state of the silicone liquid is provided, and the apparatus for diagnosing deterioration of the silicone liquid for electrical equipment And configurations.

Moreover, in order to evaporate and vaporize the cyclic compound in the collected silicon liquid 6, the heater 20 which heats the silicon liquid 6 is provided in the outer side of the gas component collection container 17. As shown in FIG. In this gas component collection container 17, the heating temperature for evaporating and vaporizing a low molecular weight, low boiling point cyclic compound generated by thermal degradation by heating the silicon liquid 6 inside by the heater 20 is about 100. ℃ to 220 ℃, preferably from about 150 to 200 ℃.

2 shows a characteristic diagram of the relationship between the heating temperature of the silicone liquid and the ionic strength of the cyclic polymer. 2 is a result of investigating evaporation and vaporization behavior of each component of trimers, tetramers, and pentamers when the temperature of the silicone liquid is increased in order to analyze the cyclic polymer as an index of deterioration.

Observation was performed by Evolved Gas Analysis (EGA-MS).

In order to raise the measurement sensitivity, the sample used not the thermal degradation product of silicone liquid, but the thing which added the trimer (D3), tetramer (D4), and pentameric (D5) of dimethyl silicone to the silicone liquid. The sample was placed in a cell, stabilized in a He atmosphere, the sample was heated at 50 ° C. at a temperature increase rate of 10 ° C./min, and gas generated continuously up to 300 ° C. was introduced into a mass spectrometer.

As characteristic ions corresponding to each of the cyclic compound polymers (D3, D4, and D5), M / Z values, that is, the ratio of the mass (M) and the number of charges (Z) of ions are selected to be 207, 281, 355, and each ion Intensity and all its ion currents were measured. The silicone liquid is heated to 50 ° C to 300 ° C under He atmosphere, the M / Z value 207 is indicated by a dashed-dotted line, the M / Z value 281 is indicated by a solid line, and the M / Z value 355 is displayed. The result shown by the broken line is shown in FIG.

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

Moreover, by heating to 150 degreeC-220 degreeC, observation time can be shortened and it can measure efficiently. Moreover, when it made temperature higher than 230 degreeC-250 degreeC, a cyclic compound polymer was detected again. It is thought that the decomposition of the silicone liquid and the evaporation and vaporization of the decomposition products have begun by setting this to a high temperature.

In the transformer gas component collecting container 17 containing the silicon liquid shown in FIG. 1, the silicon liquid 6 is heated by heating the predetermined amount of the silicon liquid 6 accommodated in the gas component collecting container 17 by the heater 20. The low molecular weight, low boiling point cyclic compound produced by the thermal deterioration of the liquid 6 is evaporated and vaporized in the gaseous part on the surface of the silicon liquid inside the gas component collecting vessel 17 to form a gas component.

As a means for collecting a predetermined amount of the silicone liquid, for example, the valve 21a is opened for a predetermined time to collect a substantially constant amount of the silicone liquid, and a means for measuring the weight of the collected silicone liquid is provided. .

The gas component of the low molecular weight compound produced by the thermal deterioration of the silicon liquid 6 vaporized and vaporized in the gas phase part inside the gas component collecting container 17 by heating is carried out through the gas pipe 18. ) And analyzes and quantifies only the low molecular weight, low boiling point cyclic compound produced by thermal deterioration by this gas analyzer (19). That is, not all the quantity of the gas component evaporated by heating is measured, but the total amount of only a cyclic compound polymer (trimer, tetramer, and pentamer) is measured from the evaporated gas component.

As a means for withdrawing a cyclic compound from the gas component collection container 17 to the gas analyzer 19, the inert gas, such as nitrogen, helium, argon, etc., is flown, for example.

In addition, an adsorbent that is capable of heating with a heater is provided inside the gas component collecting container 17, and once the gas component of the cyclic compound evaporated and vaporized in the gaseous phase is adsorbed, the ring is vaporized by heating the adsorbent. It is also possible to efficiently take out the cyclic compound by introducing the gas component of the shape compound into the gas analyzer 19 using an inert gas.

Further, by correlating the amounts of trimers, tetramers, and pentamers with the characteristics of the deterioration state such as the flash point of the silicone liquid in advance, it is possible to diagnose the deterioration based on the result obtained by the gas analyzer 19.

For example, when the analysis value obtained from the gas analysis result and the amount of the cyclic compound polymer of the calculated cyclic compound become more than a predetermined value, it is determined that the silicone liquid is deteriorated.

In the apparatus for diagnosing deterioration of the silicone fluid for electrical apparatus of the present embodiment, as shown in FIG. 1, a judging device 30, a reference value setter 33, a display device 32, and a database 31 are provided. .

And the diagnosis of deterioration of a silicone liquid inputs into the determination apparatus 30 the measurement value which quantitatively analyzed the gas component of the cyclic compound evaporated and vaporized in the silicone liquid by the gas analyzer 19, and this determination apparatus 30 Ring input from the reference value setter 33 on the basis of the measured value of the gas component of the cyclic compound (analyzed value or the amount of the cyclic compound polymer of the cyclic compound calculated) analyzed by the gas analyzer (19). Comparison is made with the reference value of the cyclic compound polymer serving as a criterion for deterioration of the cyclic compound, and it is judged that the silicone liquid is deteriorated when the measured value of the cyclic compound exceeds the reference value of the cyclic compound polymer.

The determination state of deterioration of the silicon liquid by the determination device 30 can be output from the determination device 30 and displayed on the display device 32. In addition, the measured value (the analytical value or the amount of the cyclic compound polymer of the cyclic compound to be calculated) of the gas component of the cyclic compound analyzed by the gas analyzer 19 input to the determination device 30 is determined by the determination device ( 30 may be displayed on the display device 32. In this case, the cyclic compound calculated from the analytical value or gas analysis result, which is a measured value of the gas component of the cyclic compound analyzed by the gas analyzer 19 The amount of polymer can be monitored by the determination device 30.

In addition, since the deterioration of the silicone liquid proceeds according to the years of operation of the electric equipment, the determination value of the gas component of the cyclic compound analyzed by the gas analyzer 19 in order to accurately grasp the progress of the deterioration is determined. Via the device 30, it is inputted and recorded with the data of the operation period in the database 31. Then, when the past data stored from the database 31 is called to the determination device 30 and displayed on the display device 32, the change of the deterioration situation of the silicone liquid due to the passage of the years of operation of the electric equipment is accurately grasped. It becomes possible.

Here, the properties of the silicone liquid for judging the deterioration of the silicone liquid will be described with reference to FIG. 6. Fig. 6 is a characteristic diagram showing the results of a thermal deterioration acceleration test of a silicon liquid used in a transformer containing silicon liquid, and the horizontal axis shows the aging time by the heat aging test (250 ° C. × 100 hours) of the silicon liquid. The vertical axis represents the flash point of the silicone liquid, and the vertical axis on the right represents the amount of the cyclic compound polymer contained in the silicone liquid.

As is apparent from Fig. 6, the characteristic curve showing the flash point of the silicone liquid was 300 deg. C or higher when the silicone liquid was a new one, and the flash point decreased with the passage of the aging time during which the deterioration of the silicone liquid progressed.

Moreover, the characteristic curve which shows the quantity of the cyclic compound polymer (trimer (D3), tetramer (D4), pentamer (D5)) contained in silicone liquid is a small amount, when a silicone liquid is new, As the aging time progresses, the deterioration increases rapidly.

Since the flash point of the silicone liquid may be ignited by an electric device when it is lower than 200 ° C., the amount of the cyclic compound polymer at the flash point of 200 ° C., for example, 3000 is set as a reference value for deterioration determination. When the amount of the cyclic compound polymer is measured by quantitative analysis, it is possible to accurately and simply judge the deterioration of the silicone liquid.

When it is determined that the silicone liquid is deteriorated, the operation of the electrical equipment is checked or the abnormality of the electrical equipment is checked in daily inspection items, or the silicone liquid is collected and the state is analyzed in more detail.

The schematic diagram of the monitor screen which displayed on the display apparatus 32 the state of the silicone liquid which diagnoses the thermal image of silicone liquid by the said determination apparatus 30 is shown in FIG. Fig. 3 plots the amount of the cyclic compound polymer of the gas component evaporating the silicon liquid measured by the gas analyzer 19 with respect to the operation time of the electric device, and is suitable in advance for determining the deterioration of the silicon liquid. The value 3000 (dashed line), which is the reference value of the amount of the cyclic polymer, is set.

FIG. 3 simulates a transformer A operated at a high load and a transformer B operated at a relatively low load in the thermal deterioration acceleration test, and the horizontal axis shows the aging time in terms of actual operating years.

In obtaining this characteristic, the amount of cyclic compound polymers in each time axis was measured by setting the high load column at 270 ° C and the low load column at 220 ° C.

The measured values up to the point equivalent to 10 years of operation are now plotted on the drawings in the ○ and △ tables. The dashed-dotted line is an imaginary line which connects the measured value of transformer A smoothly, and a solid line is likewise of transformer B.

The point where the extension of these virtual lines intersect the set value is the usage limit of the silicon liquid of each transformer. For the transformer B, as indicated by L, it can be estimated that there is a remaining life of about seven years.

If the actual transformer is continuously measured and the data is stored, the characteristics as shown in Fig. 3 can be obtained. Therefore, the exchange of the silicone liquid from the imaginary line connecting the respective measured values of the plurality of measured data is performed. It is possible to predict the timing.

Then, according to the degree of deterioration of the silicone liquid displayed on the monitor screen of the display device 32, when the electrical equipment is stopped, such as during regular inspection, the part or all of the silicone liquid is replaced, thereby preventing the failure of the transformer which is the electrical equipment. It becomes possible to prevent.

In addition, when the deterioration of the silicone liquid is diagnosed, the management is performed by displaying the deterioration determination of the silicone liquid determined by the means for determining the deterioration of the silicone liquid, for example, the determination apparatus 30 on the monitor screen of the display device 32. It is possible to facilitate.

For example, when the amount of the cyclic compound polymer of the silicone liquid exceeds a predetermined value set in advance, it is determined that the silicone liquid has deteriorated and is displayed on the monitor screen of the display device 32.

The frequency of confirmation of deterioration of the silicone liquid of an electrical apparatus is once a week, once a month, etc. Therefore, the determination device 30 can be operated regularly to determine deterioration every predetermined period.

The determination device 30 further includes a heater 20 for operating the gas component collecting container 17 and the gas analyzer 19, operating the pump or valve 21a for supplying the silicon liquid, and heating the silicon liquid. And a control device for controlling the operation of each one), and the pump (not shown) is operated at predetermined intervals according to the operation command of the determination device 30 to collect the silicon liquid 6 in the tank 1 At the same time as the container 17 is introduced, the heater 20 of the gas component collection container 17 is heated to start the heating of the silicon liquid 6, and the gas analyzer 19 is operated. Let's do it.

First, the valve 21a is opened in response to an operation command from the judging device 30, the silicon liquid 6 in the tank 1 is collected from the sampling pipe 16a connected to the tank 1, and the valve After closing (21a), the heater 20 is operated to heat the silicon liquid 6 collected in the gas component collection container 17 to evaporate and vaporize the cyclic compound contained in the silicon liquid, and this evaporated vaporized ring. The shaped compound is quantitatively analyzed by the gas analyzer 19.

The display device 32 displays the deterioration of the silicone liquid determined by the determination device 30 based on the analysis value of the cyclic compound analyzed by the gas analyzer 19 or the analysis value of the cyclic compound.

After analyzing the amount of the cyclic compound polymer by the gas analyzer 19, the heater 20 installed in the gas component collection container 17 is stopped by the instruction from the determination device 30, Cleanse the ingredients. Since the silicon liquid 6 is small in the amount of decomposition products, the silicon liquid 6 may be returned to the tank 1 without being discharged out of the system. In addition, since the quantity of the silicone liquid 6 measured is a small quantity (for example, 50 ml), you may discard it.

It is also possible to monitor electric equipment such as a plurality of transformers by one gas analyzer and determination device.

As mentioned above, since the frequency of confirmation of deterioration of the silicon liquid 6 is once a week or once a month, the silicon for an electric device having several electric devices and a pipe converting device for one analysis device. The liquid deterioration diagnosis system may be used.

Each of the silicon liquids 6 is collected from a plurality of electric devices, and the state of deterioration of the silicon liquid of each electric device can be grasped.

In the case of collecting the silicon liquid 6 used for one determination, when the amount of the silicon liquid is large, quantification of the gas obtained is easy, and when the amount is small, the heating of the silicon liquid becomes easy.

It is preferable to make the collection of the silicone liquid 6 into 1-50 ml, and sufficient measurement is possible even if it is about 1-5 ml. Since the silicone liquid 6 remaining in the gas component collection container 17 after deterioration determination does not have a low molecular weight compound which lowers a flash point, it can return to the tank 1 and can reuse it.

In that case, it is preferable to provide the return piping which returns the silicone liquid 6 to the tank 1, and the pump which refluxs the silicone liquid 6 in the piping.

The pump can be controlled by the determination device 30 described above. In addition, the silicon liquid 6 after deterioration is determined may be discarded, and it may be set as the structure which replenishes as needed.

According to the transformer containing the silicon liquid of the above-mentioned structure, it is produced | generated by the thermal deterioration of the silicon liquid 6 of the insulation and cooling medium accommodated in the inside of the tank 1 during operation of a transformer, The dissolved cyclic compound was evaporated and vaporized in the gaseous phase on the liquid surface of the silicon liquid 6 by heating the silicon liquid 6 so as to be analyzed as a gas. Since the cyclic compound can be easily and efficiently quantified on-site, it is possible to easily prevent the maintenance of the transformer containing the silicone liquid.

The silicon liquid 6 of the insulation and cooling medium used for the transformer containing the silicon liquid is circulated between the tank 1 and the cooler 8 via the cooling pipes 9a and 9b connected to both. The silicon liquid 6 cooled by the cooler 8 is supplied to the iron core 2 installed inside the tank 1, the windings of the inner winding 3 and the outer winding 4, and the like to cool these devices. For this reason, the lower the viscosity of the silicone liquid 6 is preferable, particularly, the kinematic viscosity at 25 ° C is preferably 55 mm 2 / s or less.

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

In addition, after the improvement of the fire resistance of the transformer or the compaction of the device by increasing the operating temperature, the silicone liquid 6 is preferably flame retardant, and particularly preferably has a flash point of more than 250 ° C.

Therefore, as the silicon liquid 6 of the insulation and cooling medium used in a transformer containing silicon liquid, a silicon liquid 6 having a flash point of more than 250 ° C. and having a kinematic viscosity at 25 ° C. of 55 mm 2 / s or less is effective. Do.

In addition, the silicon liquid 6 of the present embodiment may be made to add an additive such as an antistatic agent used in a transformer containing mineral oil.

According to this embodiment, since the low molecular weight, low boiling point cyclic compound produced by the insulation of the electrical equipment containing the silicone liquid and the thermal degradation of the silicone liquid used as the cooling medium can be easily and efficiently measured onsite. Insulation of electrical equipment containing silicone liquid and deterioration diagnostic apparatus of electrical liquid silicone liquid and electrical liquid silicone liquid which enable accurate and easy diagnosis of thermal deterioration of silicone liquid to be used as a cooling medium. Diagnostic method can be realized.

(Example 2)

Next, the configuration of the apparatus for diagnosing deterioration of the silicone fluid for transformer containing the silicone fluid as another embodiment of the present invention will be described with reference to FIG. In the transformer of the transformer containing the silicon liquid of the present embodiment shown in FIG. It is composed.

Since the pipe 16a for collecting the silicon liquid 6 is installed to communicate with the cooling pipe 9b without directly communicating with the tank 1, the pipe 16a can be easily installed.

The deterioration diagnosing apparatus of the silicon liquid for transformer containing the silicone liquid of this embodiment shown in FIG. 4 is a deterioration diagnosing apparatus of the silicon liquid for transformer containing the silicone liquid of Example 1 shown in FIG. Since are the same, description of the structure common to both is abbreviate | omitted.

In addition, the transformer containing silicon liquid according to the present embodiment in FIG. 4 is insulated during operation and low molecular weight, low boiling point cyclic compounds generated by thermal deterioration of the silicon liquid 6 of the cooling medium are analyzed onsite. In addition, since the method of quantification is the same as that of Example 1 shown in FIG. 1, description here is abbreviate | omitted.

The above-described deterioration diagnosing apparatus for the silicone fluid for transformers containing the silicone liquid of the present embodiment is similar to the embodiment described in FIG. Low-molecular-weight and low-boiling cyclic compounds produced by thermal deterioration can be easily and efficiently measured on-site so that the thermal deterioration of the silicone liquid used as insulation and cooling medium of electrical equipment containing silicone liquid can be accurately measured. In addition, it is possible to realize a deterioration diagnosing apparatus for a silicone liquid for an electric apparatus and a method for diagnosing a deterioration of a silicone liquid for an electrical apparatus, which enables easy diagnosis.

(Example 3)

FIG. 5 shows an apparatus for diagnosing deterioration of a silicone liquid for an electric device, which is another embodiment of the present invention. This example circulates the silicon liquid 6 in the analyzer. In this embodiment, the collection port of the silicon liquid 6 is used as the tank main body 1 and the discharge port of the silicon liquid 6 is the piping 9b of the cooler 8. The pump 28 for circulation of the silicone liquid 6 was installed in the piping 16a.

The valve 21a provided in the pipe 16a and the valve 21b provided in the pipe 16b are opened to circulate the silicon liquid 6 through the pipe communicating with the gas component collection container 17. When the silicon liquid in the sampling container 17 is replaced with the predetermined amount of the silicon liquid 6 collected at the time of measurement, the valves 21a and 21b are closed to obtain a predetermined amount of silicon in the gas component sampling container 17. The liquid 6 is heated and evaporated by the heater 20 provided in the gas component collection container 17, and gas components are collected.

Next, the gas component collected by the gas component collection container 17 is analyzed by the gas analyzer 19 to measure the amount of the cyclic compound polymer in the gas component. And based on the measured value (the analytical value and the amount of ring compound polymer of the cyclic compound calculated) of the gas component analyzed with this gas analyzer 19, the cyclic | annular shape input from the reference value setter 33 was carried out. Comparison is made with the reference value of the cyclic compound polymer serving as a criterion for deterioration of the compound, and it is judged that the silicone liquid is deteriorated when the measured value of the cyclic compound exceeds the reference value of the cyclic compound polymer.

The determination state of deterioration of the silicon liquid by the determination device 30 is outputted from this determination device 30 and displayed on the display device 32.

In addition, the determination device (the analysis value or the amount of the cyclic compound polymer of the cyclic compound to be calculated) of the gas component of the cyclic compound analyzed by the gas analyzer 19 input to the determination device 30 is determined. When the display device 32 displays the display device 32 via 30, in this case, the cyclic compound calculated from the analysis value or the gas analysis result, which is a measured value of the gas component of the cyclic compound analyzed by the gas analyzer 19, The amount of polymer can be monitored by the determination device 30.

The silicone liquid 6 after the measurement can be returned to the tank 1 by opening the valves 21a and 21b because only the cyclic polymer is reduced.

In addition, although the silicon liquid 6 may be collected from the cooling pipe 9b, in order to reduce the heating at the time of analysis, it is efficient to collect from the cooling pipe 9a or the upper part of the tank 1 main body.

In addition, the cooling pipes 9a and 9b are preferable because the flow rate of the silicon liquid 6 is high, so that circulation is generated by making the discharge port of the silicon liquid 6 a pipe, and a part of the pump can be omitted.

In addition, this embodiment has a function of informing the diagnosis result of the deterioration diagnostic apparatus of the silicone fluid. In addition to displaying the measured value of the gas component (the amount of the cyclic compound polymer of the cyclic compound) of the cyclic compound analyzed by the gas analyzer 19, the determination device (based on the measured value of the gas component of the cyclic compound) When the reference value of the cyclic compound polymer which is a criterion for deterioration is exceeded by the comparative operation in 30), the silicone liquid is judged to be deteriorated, and the deterioration determination result of the silicone liquid is displayed on the display device 32. Therefore, the determination device 30 can monitor the analysis value which is the measured value of the gas component of the cyclic compound analyzed by the gas analysis device 19 and the diagnostic result of the deterioration diagnostic device of the silicone liquid.

The manager can confirm the deterioration state of the silicone liquid 6 and manage the device according to this embodiment. For example, when the discharge amount of the cyclic compound polymer exceeds a predetermined value set in advance, it may be provided with an alarm device or the like that determines that the silicone liquid 6 has deteriorated and gives an alarm.

For example, the reference value input to the reference value setter 33 may be set by investigating and setting the measured value obtained from the deteriorated silicone liquid, the characteristics such as electrical conductivity and ignition temperature.

In addition, although a well-known thing can be employ | adopted as a valve | bulb and an alarm apparatus, it is preferable that a valve opens at the time of a power supply stop, and an alarm turns ON.

According to the present embodiment, since the low molecular weight and low boiling point cyclic compound produced by the insulation of the electrical equipment containing the silicone liquid and the thermal degradation of the silicone liquid used as the cooling medium can be easily and efficiently measured on site. Device for diagnosing the deterioration of silicone fluid for electrical equipment and silicone fluid for electrical equipment, which makes it possible to accurately and easily diagnose the thermal deterioration of the silicone liquid used as a cooling medium and the insulation of electrical equipment containing silicone liquid. The method can be realized.

Next, an example of the operation pattern of the deterioration diagnosis in the electrical apparatus containing the silicon liquid provided with the deterioration diagnosis apparatus of the silicon liquid shown in FIG. 1, FIG. 4, FIG. 5 is demonstrated. Diagnosis by the deterioration diagnosing device of the silicone fluid can be performed at a set frequency, such as once a week or once a month, or repeatedly.

Hereinafter, an example of the diagnosis using the apparatus for deteriorating diagnosing silicon fluid performed at each cycle will be described. The operation of the deterioration diagnostic device of silicon liquid is mainly divided into four stages: measurement preparation, measurement, cleaning, and normal state.

Operation details for diagnosing deterioration Valves (V1, V2) Heater (H) time Measurement Preparation Replacement of Silicone Fluid in Piping Opening OFF 10 min Sampling, Measurement Measure the amount by heating and extracting the cyclic compound in a certain amount of silicone liquid Closure ON 10 min cleaning Dispose of the measured silicone fluid out of the system or back into the tank Closure OFF 15 min Normal time (standby time) stop Closure OFF Predetermined period

In addition, the time required for each step of Table 1 can be appropriately adjusted according to the constitution of the pipe, the frequency of the inspection of the silicone liquid, the service period of the silicone liquid, and the like. In the case where the measurement is performed at a certain interval of time, it is also possible to monitor the respective electric devices by converting the flow path of the pipes by connecting a plurality of electric devices and one analysis device by pipes.

In the measurement preparation step of the silicone liquid 6, the pump and the valve are opened according to the operation command from the determination device 30, and the sampling pipe connected to the tank 1, or the gas component for collecting the silicone liquid 6. The silicon liquid 6 in the sampling container 17 is circulated.

In the measuring step of the silicone liquid 6, the pump and valve are closed by the operation command from the determination device 30, and the heater 20 is operated to collect a predetermined amount of the silicone liquid 6 in the gas component collection container 17. The gas component of the cyclic compound evaporated by heating is analyzed by the gas analyzer 19, and the deterioration state of the silicone liquid is determined by the determination device 30 based on the measured value of the gas component of the analyzed cyclic compound. .

In the cleaning step, the heater 20 is stopped by an operation command from the determination device 30 to purify and remove the components remaining in the analyzer or the like and the silicon liquid. The silicone liquid after the deterioration diagnosis of the silicone liquid may be returned to the tank 1 without being discharged out of the system because the cyclic compound polymer and the like are removed and the decomposition products are small. In addition, since the quantity of the silicone liquid 6 measured is a small quantity (about 1-50 ml), you may discard it.

On the basis of the information of the silicon liquid detected at the time of the measurement of the silicone liquid, a means of informing the manager of the deterioration of the silicone liquid 6 according to an operation command in the determination device 30, or the operation of an electric apparatus containing the silicone liquid. By controlling the means for stopping the operation, it is possible to effectively prevent abnormality of the apparatus and to preventive maintenance.

The application of the operation pattern of the apparatus for diagnosing deterioration of silicone liquid to the electric apparatus containing the silicone liquid of the present embodiment described above is performed by the insulation of the electrical apparatus containing the silicone liquid and by the thermal deterioration of the silicone liquid which is used as the cooling medium. Low molecular weight and low boiling point cyclic compounds can be easily and efficiently measured on-site, enabling accurate and simple diagnosis of thermal deterioration of the silicone liquid used as insulation and cooling medium for electrical equipment containing silicone liquid. The deterioration diagnostic apparatus of the silicone liquid for electrical equipment and the degradation diagnostic method of the silicone liquid for electrical equipment can be realized.

1 is a schematic diagram showing the configuration of a deterioration diagnostic apparatus of a transformer containing a silicon liquid of an embodiment of the present invention,

2 is a characteristic diagram showing the relationship between the heating temperature of a silicone liquid and the ionic strength of a cyclic polymer;

3 is a schematic diagram of a monitor screen of the degradation diagnostic apparatus installed in the embodiment of FIG.

Figure 4 is a schematic diagram showing the configuration of a deterioration diagnostic apparatus of a transformer containing a silicon liquid of another embodiment of the present invention,

FIG. 5 is a schematic diagram showing the configuration of a degradation diagnostic apparatus for a transformer containing silicon liquid for circulating silicon liquid in an analysis device according to another embodiment of the present invention;

Fig. 6 is a characteristic diagram showing a result of an accelerated test for thermal deterioration of a silicone liquid.

※ Explanation of code for main part of drawing

1: tank 2: iron core

3: inner winding 4: outer winding

5: insulated container 6: insulated cooling medium

7: nitrogen 8: cooler

9a, 9b: cooling piping 10a, 10b: fastening metal fixture

11, 12, 13, 14: insulator 15: liquid inlet

16a, 16b: piping 17: gas component collection container

18: gas piping 19: gas analyzer

20: heater 21a, 21b: valve

30: judging device 31: database

32: display device 33: reference value setter

Claims (13)

An electrical apparatus, a tank accommodating the electrical apparatus therein, a silicone liquid stored in the tank to insulate and cool the electrical apparatus, and a sampling pipe for collecting a portion of the silicone liquid in the tank to the outside of the tank; A gas component sampling container for heating and evaporating the cyclic compound contained in the silicone liquid by heating the silicon liquid collected from the sampling pipe, and a gas analyzer for quantitatively analyzing the cyclic compound evaporated and vaporized in the gas component collecting container; A judging device for judging the thermal degradation state of the silicone liquid based on the analytical value of the cyclic compound analyzed by the gas analyzer, and the analysis value and / or the judging device of the cyclic compound analyzed by the gas analyzer An apparatus for diagnosing deterioration of silicone liquid for electrical equipment, comprising: a display device for displaying deterioration of the silicone liquid; The method of claim 1, The gas component sampling container has a function of heating the collected silicon liquid at 100 ℃ to 220 ℃ deterioration diagnostic apparatus of the silicone liquid for electrical equipment. The method of claim 1, And a judging device for judging the deterioration of the silicone liquid on the basis of a comparison between the analysis value of the cyclic compound analyzed by the gas analyzer and a reference value serving as a criterion for deterioration. Deterioration diagnostic device. The method of claim 1, And said electrical equipment is any one of a transformer, a reactor, a voltage regulator, a capacitor, and a resistor. The method of claim 1, And a return pipe for returning the silicon liquid remaining in the gas component collecting container from the gas component collecting container to the tank, and a pump installed in the return pipe to supply the silicon liquid to the tank. Degradation diagnosis device of silicone liquid. The method of claim 5, Operation of operating or stopping the pump, evaporating and evaporating a cyclic compound by heating a silicone liquid in the gas component collection container when the pump is stopped, and performing an quantitative analysis of the cyclic compound by the gas analyzer. An apparatus for diagnosing deterioration of silicone fluid for electrical equipment, comprising: a control device for controlling; The method of claim 1, A cooler for cooling the silicon liquid in the tank, providing a cooling pipe for circulating the silicon liquid between the tank and the cooler, and communicating the sampling pipe for collecting the silicon liquid to the cooling pipe. An apparatus for diagnosing deterioration of silicone fluid for electrical appliances, characterized in that the one. The method of claim 1, The silicone liquid has a flash point of 250 ° C. or higher and a kinematic viscosity at 25 ° C. of 55 mm 2 / s or less. In the method for diagnosing the degradation of the silicone liquid for electrical equipment contained in the tank and insulated and cooled by the silicone liquid stored in the tank, A portion of the silicon liquid in the tank is collected outside of the tank through a sampling pipe, and the collected silicon liquid is supplied to a gas component collecting container and heated in the gas component collecting container to obtain a cyclic compound contained in the silicone liquid. The vaporized and evaporated cyclic compounds were supplied to a gas analyzer and quantitatively analyzed by the gas analyzer, and the silicon liquid was deteriorated by the determination device based on the analysis values of the cyclic compounds analyzed by the gas analyzer. Determination of the situation, and the diagnostic value of the cyclic compound analyzed by the gas analyzer and / or the degradation state of the silicone liquid determined by the determination device to display on the display device degradation diagnostic method of the silicone liquid for electrical equipment . The method of claim 9, Silicon gas deterioration diagnostic method of the electrical fluid, characterized in that the silicon component is heated at 100 ℃ to 220 ℃ by the gas component collection container. The method of claim 9, Diagnosis of the deterioration of the silicon liquid by the gas analyzer is characterized in that the deterioration situation is determined based on a comparison between the analysis value of the cyclic compound analyzed by the gas analyzer and a reference value which is a criterion for deterioration. Deterioration Diagnosis Method of Silicone Liquid for Electrical Equipment. The method of claim 9, And said electrical equipment is any one of a transformer, a reactor, a voltage regulator, a capacitor, and a resistor. The method of claim 9, A silicone liquid deterioration diagnostic method for an electric apparatus, characterized in that a silicone liquid having a flash point of 250 ° C. or higher and a kinematic viscosity at 25 ° C. of 55 mm 2 / s or less is used.

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