JP3170774B2 - Oil-dissolved gas extractor, abnormality diagnosis device, and oil-filled electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dissolved gas extractor in oil, an abnormality diagnosis device provided with the dissolved gas extractor in oil, and an oil-filled electric device provided with the abnormality diagnosis device.
In particular, the present invention relates to a device suitable for more efficiently extracting gas dissolved in insulating oil in oil-filled electric equipment.

[0002]

2. Description of the Related Art In general, in oil-filled electrical equipment such as oil-filled electrical equipment and oil-filled reactors, various gases (H 2) generated when abnormalities such as overheating and discharge occur inside.
2, CH4, C2H4, C2H6, C2H2, CO, CO2, etc.) are extracted from the dissolved oil, the components are detected using a gas sensor or chromatography, and the concentration of the detected gas is measured. Then, a deterioration diagnosis is performed in which the presence or absence of an internal abnormality is determined by comparing the measured gas concentration with a preset reference value.

[0003] A series of operations such as extraction, detection and concentration measurement of dissolved gas in oil may be performed at a site where oil is sampled and provided with appropriate equipment, or installed at a site. The function of performing the above-described series of operations may be periodically performed by an abnormality diagnosis device that is all in place. Therefore, the abnormality diagnosis device is installed in the oil-filled electric device.

[0004] In this case, in the latter type of abnormality diagnosis apparatus installed on site, as a method for extracting dissolved gas in oil, the method for extracting dissolved gas in oil having a gas-permeable polymer membrane that does not require any mechanical operation is used. It is known that using a vessel is convenient. In this gas-in-oil dissolved gas extractor, the insulating oil and the gas reservoir are partitioned by the polymer film, and therefore, the insulating oil and the surface of the polymer film are generally brought into contact.

[0005] The prior art of the dissolved gas in oil extractor is as follows.
As shown in FIG. 6, an extraction container 5 is attached to a connection pipe 3 of a tank 1 via a gate valve 4, a polymer film 6 is held in the extraction container 5 by a reinforcing material 7, and an insulating oil in the tank 1 2
When the polymer film 6 comes into contact with the polymer film 6, the polymer film 6 is configured to allow only the dissolved gas contained in the insulating oil 2 to pass through the gas reservoir 8 and to be extracted. The main one is convenient because it can be installed by using a drain valve or the like instead of the gate valve 4.
No. 58609 and the like.

Although not shown as another prior art using a gas permeable polymer membrane, see, for example, JP-A-3-25
No. 3010, a polymer film formed in a pipe shape is provided in a container, and gas permeated into the pipe of the polymer film can be collected. It can be installed outside and inside of the building.

[0007]

By the way, today,
As quicker detection of internal abnormalities in oil-filled electrical equipment is required, on-site abnormality diagnosis apparatuses tend to reduce the interval between periodic diagnosis.

However, the conventional dissolved gas extractor using a polymer membrane requires mechanical operation, unlike the piston method and the bubbling method (extracting a dissolved gas by blowing a carrier gas into insulating oil). Although there is an advantage that the gas concentration does not occur, it takes time for the gas concentration to be constant in the gas reservoir. In other words, there is a problem that it takes a considerable time for the dissolved gas pressure in the oil and the gas pressure in the gas reservoir to reach an equilibrium state.

[0009] and gas pressure in the oil dissolved gas pressure and the gas reservoir can become an equilibrium state saturation time depends on the type and the gas reservoir of the gas and reach equilibrium except relatively fast H2, Often more than a few days. This is unsuitable if regular diagnosis is performed daily.

In order to shorten the time required for the gas pressure to reach an equilibrium state, it is easy to increase the size of the polymer membrane and increase the area thereof. Not only does the vessel itself become large, but also its installation space becomes large.

Further, if the diagnosis must be performed before the dissolved gas is saturated in the gas reservoir, the measured value is multiplied by a conversion coefficient experimentally obtained for each gas to convert the gas into a saturated value. It can be fixed, but there is a problem that this involves an error.

An object of the present invention is to provide a gas-in-oil dissolved gas extractor capable of quickly and easily extracting a gas-dissolved gas without increasing the size of the apparatus in view of the above-mentioned problems of the prior art. Another object is to provide an abnormality diagnosis device capable of efficiently extracting a dissolved gas, and still another object is to accurately and fluctuate the fluctuation of insulating oil in a tank. An object of the present invention is to provide an oil-filled electrical device that can be monitored quickly and the interval of a periodic diagnosis can be shortened as much as possible.

[0013]

In order to achieve the above object, a dissolved gas-in-oil extractor according to the present invention comprises: an extraction container for introducing insulating oil; and a space disposed in the extraction container and opposed to each other. each thereby forming a gas reservoir chamber, a plurality of sets of the polymer film having oil resistance and heat resistance is extracted by transmitting dissolved gas in insulating oil into the gas reservoir of each said, each each set gas Connecting the chambers together,
Dissolve the extracted dissolved gas into each gas reservoir
Discharging means, wherein the plurality of sets of polymer membranes are
In a state where they are stacked on each other via spacers
It is characterized by being arranged .

Further, in the abnormality diagnosis apparatus of the present invention,
Along with introducing the insulating oil, a dissolved gas in oil extractor that permeates and extracts the dissolved gas in the insulating oil, and separates each type by taking in the dissolved gas extracted by the dissolved gas in oil extractor, A gas analyzer for measuring the concentration of the separated gas, wherein the gas-dissolved gas extractor is provided with: an extraction container for introducing insulating oil; and a gas storage chamber disposed in the extraction container and opposed to each other. And a set of oil-resistant and heat-resistant polymer membranes for permeating and extracting the dissolved gas in the insulating oil into the gas reservoir, and connected to the gas reservoir between the polymer membranes, Discharging means for discharging dissolved gas in the storage chamber to the outside; the gas analyzer includes a calibration pipe for taking in the dissolved gas in the gas storage chamber in the extraction container, and various gases by guiding the dissolved gas in the calibration pipe. Separation means for separating into It is characterized in that it has a measuring means for measuring the concentration of the separated different dissolved gas. In this case, the dissolved gas-in-oil extractor is
In addition to providing a plurality of sets of sub-membrane,
It may be connected to each gas reservoir.

Further, the oil-filled electric device of the present invention has an abnormality diagnosis device including the gas-dissolved gas extractor and the gas analyzer.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 show an oil-filled electric apparatus to which a first embodiment of the abnormality diagnosis device according to the present invention is applied.

As shown in FIG. 1, the oil-filled electrical equipment of the embodiment is installed in a tank 1 of the oil-filled electrical equipment. Having an extractor 10 for extracting dissolved gas in oil extracted by extraction and a gas analyzer 20 for taking in the gas extracted by the extractor for dissolved gas in oil and separating them by type, and measuring the concentration of the separated gas. A diagnostic device is provided.

More specifically, as shown in FIG. 1, the dissolved gas in oil extractor 10 of the abnormality diagnosis device includes an extraction container 11 into which the insulating oil 2 in the tank 1 is introduced, and as shown in FIG. Two polymer membranes 12a and 12b immersed in insulating oil in the extraction container 11 and forming a gas reservoir 13 in the space facing each other as shown in FIG. It has pipes 14a and 14b for discharging gas.

The extraction container 11 is connected to a drain pipe 3 provided in the tank 1 via a drain valve 4.

The polymer films 12a and 12b are shown in FIGS.
As shown in the figure, the reinforcing material 15 formed in a square frame shape
a and 15b are coated with a thickness of about 100 μm so as to cover one surface thereof. These two reinforcing members 15a and 15b are opposed to each other with a space therebetween, and the periphery thereof is covered with a spacer 16 so as to cover the space. Is sealed to form a gas reservoir 13 inside.
When the outside of the gas reservoir 13 is immersed in the insulating oil 2 , the polymer films 12a and 12b
It has the function of allowing only the dissolved gas inside to permeate and extracting the dissolved gas into the gas reservoir 13, and has oil resistance to insulating oil and also has heat resistance to temperature rise of insulating oil. And made of a copolymer film of, for example, ethylene tetrafluoride and perfluoroalkyl vinyl ether. The two reinforcing members 15a and 15b are, for example, metal sintered plates each having a thickness of about several millimeters. The reinforcing members 15a and 15b are also made of stainless steel having oil resistance to insulating oil and heat resistance to temperature rise of insulating oil. Has become.

On the other hand, the gas analyzer 20 of the abnormality diagnosis device
Is a calibration tube 21 for taking in dissolved gas in the gas reservoir in the extraction vessel 11, a separation column 22 for guiding and passing the dissolved gas in the calibration tube 21 to separate into various gases, and a separation column 22. It has a gas sensor 23 for measuring the concentrations of various separated gases, and a display means 24 for displaying the measured concentrations of the gases.

The two ends of the calibration pipe 21 are connected to the pipes 14a, 14b of the dissolved gas in oil extractor 10 by solenoid valves 25a, 25b.
5b. Then, the gas extracted into the gas storage chamber 13 is filled in the calibration pipe 21 by the pump 26 provided at an intermediate position of the pipe 14a.
It is configured to homogenize the filled gas.
The switching solenoid valves 25a and 25b disconnect the passages with the pipes 14a and 14b when diagnosing the gas, and the one pipe 2 having the separation column 22 and the gas sensor 23.
7 and the other pipe 29 having the pump 28 so as to be connected to the calibration pipe 21 and the pipes 27 and 29.
Are connected.

The separation column 22 includes switching solenoid valves 25a, 25a
5b is operated, the calibration pipe 21 is connected to the pipes 27 and 29, and the pump 28 is driven. When the gas in the calibration pipe 21 passes through the pipe 27, the gas is separated by type and separated. Gas is sequentially sent out toward the gas sensor 23. The gas sensor 23 detects the concentration of various gases by sending various gases separated by the separation column 22.

The display means 24 displays the concentration of various gases in accordance with the output from the gas sensor 23, so that the attendant can determine whether or not the insulating oil 2 is abnormal. In this case, though not shown, if the gas concentration is abnormally higher than a predetermined reference value, an indicator for notifying the abnormality may be provided on the display means 24.

Accordingly, in the gas analyzer 20, the dissolved gas extracted is pumped from the dissolved gas in oil extractor 10 by the pump 26 to the pipes 14a and 14b and the switching solenoid valves 25a and 2a.
5b, the switching solenoid valve 2
5a and 25b are separated from the pipes 14a and 14b, are connected to the pipes 27 and 29, are separated by passing through the separation column 22 in the pipe 27, and are separated.
3 and is operated in an automatic mode in which the detection result of the gas sensor 23 is displayed on the display means 24, and the automatic mode is performed periodically. In addition, the gas analyzer 20 is configured to be switched between the automatic mode that is automatically operated periodically and the manual mode that is operated by a staff member. In the automatic mode, the pumps 26 and 28 of the gas analyzer 20 are set to be automatically operated for a predetermined time when a predetermined time is reached.

Since the oil-filled electric device of the embodiment has the above-described configuration, its operation will be described below. Abnormal effects such as overheating and electric discharge occur inside the oil-filled electrical equipment, and various gases are generated in the insulating oil, which may cause deterioration of the insulating oil. Need to be diagnosed.

Therefore, the oil-filled electrical equipment is provided with an abnormality diagnosis device having a gas-dissolved gas extractor 10 and a gas analyzer 20, and the insulating oil 2 sealed in the oil-filled electrical equipment 1 is replaced with a drain pipe 3. Since the gas-in-oil dissolved gas extractor 10 is filled through the drain valve 4, the dissolved gas in the insulating oil 2 is extracted in the extraction vessel 11 of the gas-in-oil dissolved gas extractor 10.

At this time, in the dissolved gas in oil extractor 10, two polymer membranes 12 a, 12 b
A gas reservoir 13 is formed by the polymer film 12a, 1
Since the outer surface of 2b is in contact with the insulating oil 2, each of the polymer films 12a and 12b allows the dissolved gas in the insulating oil 2 to permeate and extract the dissolved gas into the gas reservoir 13.

When the gas analyzer 20 is operated, that is, when the pump 26 is driven, the dissolved gas extracted into the gas storage chamber 13 passes through the pipes 14a and 14b, the electromagnetic switching valves 25a and 25b, and the calibration pipe 21. After being filled and uniformed, the calibration pipe 21 and the pipes 27 and 29 are connected by the switching operation of the switching solenoid valves 25a and 25b, and when the pump 28 is driven, the calibration pipe is The dissolved gas in 21 passes through the separation column 22 and is separated into each type of gas, and then each separated gas is led to the gas sensor 23, so that the concentration of the gas is measured for each type. . When the gas sensor 23 detects the gas concentration, the measured value is output to the display means 24. As a result, the display means 24 displays the concentration of the separated gas for each type.

In the embodiment, the dissolved gas in oil extractor 1
No. 0 has two polymer membranes 12a and 12b that are immersed in the insulating oil 2 in the extraction container 11 as described above, and allow the dissolved gas in the insulating oil 2 to pass therethrough and be extracted into the gas reservoir 13. Therefore, the dissolved gas can be extracted from two polymer membranes at once, and compared with the conventional technique, which extracts and transmits insulating oil only from one side of the polymer membrane, the polymer membrane can be extracted without increasing the size. Can be increased in area. Moreover, when the gas reservoir 13 is formed by the two polymer membranes 12a and 12b, the thickness is increased accordingly, but the thickness (width) of the extraction container 11 itself is not large, and the compactness can be maintained. it can.

Therefore, since the dissolved gas is extracted by the two polymer films 12a and 12b in contact with the insulating oil 2, the time during which the dissolved gas pressure and the gas pressure in the gas storage chamber 13 are in an equilibrium state can be reduced. Therefore, the extraction of the dissolved gas can be performed more quickly. Further, since the two polymer membranes extract the dissolved gas from both sides in the extraction container 11, the extraction of the dissolved gas can be made uniform. As a result, not only the extraction components and the extractor 10 can be reliably prevented from being enlarged, but also the installation space can be reduced.

Further, since the dissolved gas-in-oil extractor 10 itself has a function of extracting dissolved gas, it can be easily used when only sampling is performed without performing gas analysis on site. .

Further, in the embodiment, the abnormality diagnosis device is the oil-dissolved gas extractor 10 as described above and the gas analyzer 2
0, a calibration tube 21 in which the gas analyzer 20 takes in the dissolved gas in the gas reservoir 13 in the extraction container 11,
A separation column 22 that guides the dissolved gas in the calibration tube 21 to separate it into various gases, a gas sensor 23 that measures the concentration of the separated gas, and a display unit 2 that displays the concentration of the gas.
Therefore, the time required for a series of operations from extraction of the dissolved gas to separation / concentration measurement can be reduced.

Moreover, since the abnormality diagnosis device is configured so as to be able to switch between the automatic mode and the manual mode, it can be switched to the manual mode when necessary and can be operated. Diagnostic data can be easily obtained.

Further, in the embodiment, if the abnormality diagnosis device is installed in the oil-filled electric equipment, it is possible to always diagnose whether or not the state of the insulating oil 2 is abnormal. Can be monitored accurately and quickly, and the interval of periodic diagnosis can be shortened as much as possible.

FIG. 4 shows another embodiment of the present invention.
In this case, a plurality of sets of two polymer membranes 12a and 12b of the dissolved gas-in-oil extractor 10 in the abnormality diagnosis device are arranged in the extraction container 11 at a distance from each other. That is, the two polymer films 12a, 12b
The gas storage chamber 1 is provided in the internal space as in the above-described embodiment.
3, three sets A to C are provided in the extraction container 11 at intervals as shown in FIG. Then, the pipes 14a ', 14a ", 14b' from the other two sets B, C are connected to the pipes 14a, 14b of one set A.
(Not shown) 14b ″ are connected in parallel.

As described above, the two polymer films 12
When a plurality of sets A to C are provided, the dissolved gas in the insulating oil 2 is extracted from the two polymer films 12a and 12b to the gas reservoir 13 from each other. Thus, the area can be surely increased without causing the formation of the dissolved gas, so that the time for extracting the dissolved gas can be further reduced. Moreover, since the respective sets A to C are arranged at intervals, even if the extracted dissolved gases of the respective sets become non-uniform with each other, the gas analysis device 20 can be obtained from the respective sets A to C. The calibration pipe 21 is guided to the above, the dissolved gas can be made uniform, and the diagnosis by the gas analyzer 20 can be performed more accurately.

FIG. 5 shows still another embodiment of the present invention. In this case, a plurality of sets of two polymer membranes 12a and 12b of the dissolved gas-in-oil extractor 10 are arranged in the extraction container 10 in a state of being stacked on each other with the spacer 17 interposed therebetween.

That is, in this embodiment, three sets of two polymer films 12a and 12b forming the gas reservoir 13 are used, and as shown in FIG. The second set B is arranged via the arranged spacers 17, and the third set C is arranged on the second set B via the spacers 17 arranged at the four corners. The pipes of each of the sets A to C are connected in parallel similarly to the embodiment shown in FIG.

As described above, the spacers 17 are arranged at the four corners of a pair adjacent to each other, and the insulating oil 2 penetrates through the gaps between the spacers 17 arranged vertically and horizontally. Each of the polymer films 12a and 12b of each set A to C is
Dissolved gas can be extracted inside.

Therefore, according to this embodiment, three sets A to C
Are arranged in a stacked state with the spacers 17 interposed therebetween, each of the sets A to C can independently perform the extraction of the dissolved gas, and therefore, the area can be increased without increasing the size of the polymer films 12a and 12b. As a result, the time for extracting the dissolved gas can be further reduced. And each set A
~ C are stacked, compared to the embodiment shown in FIG.
Since the thickness can be reduced by that much, the space can be kept small despite the increase in the area.

[0042]

As described above, according to the first aspect of the present invention, the dissolved gas-in-oil extractor is immersed in the insulating oil in the extraction vessel to permeate the dissolved gas in the insulating oil. It has a plurality of sets of polymer membranes to extract the gas into the gas reservoir, and the dissolved gas is extracted from both sides of the two polymer membranes in each set. As a result, the time required for equilibrium with the gas pressure can be shortened, and the dissolved gas can be extracted more quickly. As a result, not only the components of the extractor and the extractor can be reliably prevented from increasing in size, but also the installation space thereof. Is also small. Further , a plurality of sets of polymer membranes are arranged in a stacked state in the extraction container via a spacer, and the area can be increased without increasing the size of the polymer membrane. There is an effect that the space can be further increased.

According to the second and third aspects, the dissolved gas in oil extractor for permeating and extracting the dissolved gas in the insulating oil, and the gas extracted by the dissolved gas in oil extractor are taken into each type. Separately and separately, a gas analyzer that measures the concentration of the separated gas constitutes an abnormality diagnosis device, and reliably shortens a series of working times from extraction of dissolved gas to separation and concentration measurement. There are effects that can be realized.

Further, according to the fourth and fifth aspects, the abnormality diagnosis device is installed in the oil-filled electrical equipment, so that it is possible to constantly diagnose whether or not the state of the insulating oil is abnormal. There is an effect that it is possible to provide an oil inlet device that can accurately and quickly monitor the change.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part showing an oil-filled electrical apparatus to which a first embodiment of an abnormality diagnosis device according to the present invention is applied.

FIG. 2 is an explanatory diagram showing a dissolved gas in oil extractor of the abnormality diagnosis device.

FIG. 3 is an enlarged sectional view taken along line ZZ in FIG. 2;

FIG. 4 is an explanatory view of a dissolved gas in oil extractor showing a second embodiment of the abnormality diagnosis device according to the present invention.

FIG. 5 is an explanatory view of a dissolved gas extractor in oil showing another embodiment of the abnormality diagnosis device according to the present invention.

FIG. 6 is an explanatory view showing a conventional dissolved gas in oil extractor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric equipment tank, 2 ... insulating oil, 10 ... dissolved gas extractor in oil, 11 ... extraction container, 12a, 12b ... polymer membrane, 13 ... gas storage chamber, 14a, 14b ... pipe, 20 ... gas analysis Apparatus, 21 Calibration tube, 22 Separation column, 23
Gas sensor, 24 ... display means.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 27/12

Claims (5)

(57) [Claims] 1. An extraction container for introducing insulating oil, a gas reservoir formed in the extraction container and opposed to each other, and a gas reservoir formed therein. A plurality of sets of oil-resistant and heat-resistant polymer membranes that allow oil to permeate and extract, and a gas discharge chamber that connects each gas storage chamber of each set to each other and discharges dissolved gas extracted to each gas storage chamber. Means, wherein the plurality of sets of polymer membranes are arranged in a stacked state via a spacer in an extraction vessel. 2. An abnormality diagnosis apparatus for extracting, detecting, and measuring the concentration of dissolved gas in insulating oil, wherein the extracting device introduces the insulating oil and transmits and extracts the dissolved gas in the insulating oil. And a gas analyzer that takes in the dissolved gases extracted by the oil-dissolved gas extractor and separates them by type, and measures the concentration of the separated gas, wherein the oil-dissolved gas extractor is an insulating oil. And a gas reservoir formed in the space opposed to each other and formed in the extraction container, and through which the dissolved gas in the insulating oil is permeated and extracted through the gas reservoir. A set of polymer membranes having properties, connected to a gas reservoir between the polymer membranes, and a discharge means for discharging dissolved gas in the gas reservoir to the outside, wherein the gas analyzer is an extraction vessel. Dissolved gas in gas reservoir A calibration tube to capture, separation means for separating the various gas led to dissolved gas of the detection amount tract, troubleshooting apparatus characterized by having a measuring means for measuring the concentration of various dissolved gases separated. 3. An abnormality diagnosis apparatus for extracting, detecting, and measuring the concentration of a dissolved gas in an insulating oil, wherein the insulating oil is introduced, and the dissolved gas in the oil is extracted by permeating the dissolved gas in the insulating oil. And a gas analyzer that takes in the dissolved gases extracted by the oil-dissolved gas extractor and separates them by type, and measures the concentration of the separated gas, wherein the oil-dissolved gas extractor is an insulating oil. And an extraction container which is disposed in the extraction container, and has a gas reservoir formed in a space portion facing each other, and an oil-resistant oil which extracts and dissolves dissolved gas in insulating oil into each gas reservoir. A plurality of sets of polymer membranes having heat resistance and heat resistance, and a discharge means for connecting the respective gas storage chambers of each set to each other and discharging dissolved gas extracted into each gas storage chamber, Gas analysis A calibration pipe for taking in the dissolved gas in the gas reservoir in the extraction vessel, a separation means for guiding the dissolved gas in the calibration pipe to separate into various gases, and a measuring means for measuring the concentration of the separated various dissolved gases. An abnormality diagnosis device comprising: 4. An extraction container for introducing insulating oil in a tank, a gas storage chamber disposed in the extraction container and opposed to each other to form a gas storage chamber, and a dissolved gas in the insulating oil filled in the gas storage chamber. A pair of polymer membranes having oil resistance and heat resistance that are permeated and extracted, and a dissolved gas in oil that is connected to a gas reservoir between the polymer membranes and that has a discharge unit that discharges dissolved gas in the gas reservoir to the outside. It has an extractor, a calibration tube for taking in the dissolved gas in the gas reservoir in the extraction container, separation means for guiding the dissolved gas in the calibration tube to separate into various gases, and measuring means for measuring the concentration of the separated various dissolved gases. An oil-filled electrical device having an abnormality diagnosis device including a gas analyzer. 5. An extraction container for introducing insulating oil in a tank, a gas storage chamber is formed in each of the space portions disposed in the extraction container and opposed to each other. A plurality of sets of polymer membranes having oil resistance and heat resistance for allowing dissolved gas to permeate and extract, connecting each gas reservoir of each set to each other, and discharging the dissolved gas extracted to each gas reservoir. Dissolved gas extractor in oil having discharge means, calibration pipe for taking in dissolved gas in the gas reservoir in the extraction vessel, separation means for guiding dissolved gas in the calibration pipe to separate into various gases, various separated dissolved gases An oil-filled electrical device, comprising: an abnormality diagnosis device including a gas analyzer having a measuring unit for measuring the concentration of oil.