JP3704548B2 - Gas monitor in oil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-oil gas monitoring device that detects a gas dissolved in insulating oil of an oil-filled electrical device such as an oil-filled transformer and diagnoses an abnormality by measuring its components.
[0002]
[Prior art]
FIG. 5 is a cross-sectional view showing the configuration of a conventional oil-in-gas monitoring device disclosed in, for example, Japanese Patent Publication No. 3-78924.
In the figure, reference numeral 1 denotes a tank of an oil-filled electrical device such as an oil-filled transformer, in which an electrical device (not shown) is immersed and stored in an insulating oil 2. Reference numeral 3 denotes a gas extraction chamber in which the insulating oil 2 stays, and is connected to the tank 1 via an oil delivery pipe 4 and an oil delivery pipe 5. Reference numerals 6 and 7 denote three-way switching valves connected in the middle of the oil delivery pipe 4 and the oil delivery pipe 5, respectively. Reference numeral 8 denotes a bypass pipe for connecting the three-way switching valves 6 and 7 to each other. An insulating oil circulation passage 9 is formed together with the oil feed pipe 5.
[0003]
Reference numeral 10 denotes a pump for circulating the insulating oil 2 connected to the gas extraction chamber 3 side from the three-way switching valve 7 of the oil delivery pipe 5, and 11 is a lower portion of the gas extraction chamber 3. The space generating means for generating 3a comprises a bellows 12 for changing the volume in the gas extraction chamber 3, and a bellows drive unit 13 for reciprocating the bellows 12. Reference numeral 14 denotes a gas detection chamber connected to the gas extraction chamber 3 via a gas pipe 15.
[0004]
Reference numeral 16 denotes an air pipe connected in the middle of the gas pipe 15 via an on-off valve 17 and is provided for introducing air into the gas detection chamber 14. 18 is an on-off valve connected to the gas detection chamber 14 side from the position where the air pipe 16 of the gas pipe 15 is connected. 19, 20 is the gas extraction chamber 3 side from the position where the air pipe 16 of the gas pipe 15 is connected. An open / close valve to be connected, 21 is an oil level detector connected between both open / close 19 and 20 of the gas pipe 15, 22 and 23 are a gas detecting element and a gas measuring device for detecting dissolved gas in oil and measuring its components. It is.
[0005]
The conventional oil-in-gas monitoring device is configured as described above, and the bellows drive unit 13 of the space generating means 11 is driven to contract the bellows 12, thereby generating a decompressed space 3a in the upper portion of the gas extraction chamber 3. Let Then, the pump 10 is operated to cause the insulating oil 2 to be dissolved in the oil by jetting it into the decompressed space 3 a through the gas extraction chamber 3 → the oil feed pipe 5 → the bypass pipe 8 → the oil feed pipe 4. The gas is equilibrated and extracted into the space 3a, the extracted dissolved gas in oil is guided into the gas detection chamber 14, and the components contained in the dissolved gas in oil are measured by the gas detection element 22 and the gas measuring device 23. ing.
[0006]
[Problems to be solved by the invention]
As described above, the conventional oil-in-gas monitoring apparatus has a decompressed space 3a for balanced extraction of dissolved gas in oil into the gas extraction chamber 3 by the space generating means 11 including the bellows 12 and the bellows driving unit 13. Therefore, since the position adjustment of the expansion and contraction of the bellows 12 becomes complicated, the configuration of the bellows drive unit 13 becomes large and the apparatus is expensive.
[0007]
The present invention has been made to solve the above-described problems, and an oil-in-gas monitoring device capable of forming a decompressed space for balanced extraction of dissolved gas in oil with a simple configuration. Is intended to provide.
[0008]
[Means for Solving the Problems]
The oil-in-gas monitoring apparatus according to claim 1 of the present invention is provided in connection with a tank of an oil-filled electrical device, and first and second pipes that form a tank and an insulating oil circulation path in the tank. An oil collection chamber connected through the first and second insulating valves, and first and second switching valves connected in the middle of the first and second pipes, respectively, and one of the first and second pipes. A first oil pump that is connected in the middle, a gas extraction chamber that is connected to the upper side of the oil collection chamber via an oil collection chamber and a third switching valve, and the inside of which can be decompressed; an oil collection chamber and a gas extraction chamber; And the third switching valve and the second oil pump connected to each other in the middle, and the gas extraction chamber and the fifth switching valve are connected to each other and extracted into the gas extraction chamber. And a gas detection means for measuring a dissolved gas component in the insulating oil.
[0009]
According to a second aspect of the present invention, the oil-in-gas monitoring apparatus is provided in connection with a tank of an oil-filled electrical device, and the first and second tanks form a tank and an insulating oil circulation path in the tank. As an oil collection chamber in which insulating oil stays connected through the pipe, a first switching valve connected in the middle of the first pipe, and a second switching valve connected in the middle of the second pipe A three-way switching valve, an oil pump connected between the oil collecting chamber of the second pipe and the three-way switching valve, and an oil pumping chamber and a third switching valve are connected to the upper part of the oil collecting chamber via the oil collecting chamber and the third switching valve. A gas extraction chamber formed in a possible manner, a third pipe connected between the remaining one of the three-way switching valve and the gas extraction chamber, and a fourth switching valve in the middle, a gas extraction chamber, And a gas detecting means for measuring a dissolved gas component in the insulating oil connected through the switching valve of 5 and extracted into the gas extraction chamber. It is intended.
[0010]
According to a third aspect of the present invention, in the oil gas monitoring apparatus according to the first or second aspect, an oil level detection sensor for detecting the oil level of the insulating oil is provided at a predetermined position in the gas extraction chamber. .
[0011]
According to a fourth aspect of the present invention, in the oil gas monitoring apparatus according to the first or second aspect, an oil level detection sensor for detecting the oil level of the insulating oil is provided at a predetermined position in the oil collection chamber.
[0012]
According to a fifth aspect of the present invention, the oil-in-gas monitoring device according to the first or second aspect is provided with a mist-like oil droplet capturing filter between the gas extraction chamber and the gas detection means.
[0013]
According to a sixth aspect of the present invention, in the oil-in-gas monitoring apparatus according to the first or second aspect, a mist-like oil droplet capturing filter is provided in the gas extraction chamber.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings.
1 is a schematic diagram showing the configuration of an in-oil gas monitoring device according to Embodiment 1 of the present invention.
In the figure, reference numeral 31 denotes a tank of an oil-filled electrical device such as an oil-filled transformer, and an electrical device (not shown) is immersed and stored in an insulating oil 32. Reference numeral 33 denotes an oil collection chamber in which the insulating oil 32 stays, and a tank is provided via a first pipe 34 for sending the insulating oil 32 from the tank 31 and a second pipe 35 for sending the insulating oil 32 to the tank 31. 31 is connected.
[0015]
36 is a first switching valve connected in the middle of the first piping 34, 37 is a three-way switching valve as a second switching valve connected in the middle of the second piping 35, and 38 is a second piping. An oil pump 39 connected between the oil collecting chamber 33 and the three-way switching valve 37 is disposed above the oil collecting chamber 33 and is connected to the oil collecting chamber 33 via the third switching valve 40. The chamber 41 is a third pipe that connects the remaining one of the three-way switching valve 37 and the gas extraction chamber 39, and a fourth switching valve 42 is connected to the middle.
[0016]
43 and 44 are oil level detection sensors which are arranged at predetermined positions in the gas extraction chamber 39 with a predetermined interval above and below, and detect the oil level of the insulating oil 32 staying in the gas extraction chamber 39, 45 is a gas detector as a gas detecting means connected to the gas extraction chamber 39 via the fourth pipe 46, 47 is a fifth switching valve connected to the vicinity of the gas extraction chamber 39 of the fourth pipe 46, 48 is a sixth switching valve connected to the vicinity of the gas detection unit 45 of the fourth pipe 46, 49 is a fifth pipe branched from the middle of the fourth pipe 46 and connected to the seventh pipe on the way. A switching valve 50 and a pressure reducing pump 51 are connected.
[0017]
52 is a mist-like oil droplet capturing filter connected to the vicinity of the gas detection unit 45 from the fifth switching valve 47 of the fourth piping 46, and 53 is a mist-like oil droplet capturing filter 52 of the fourth piping 46. And the sixth switching valve 48 are pressure sensors 54 connected to the respective switching valves 36, 37, 40, based on information from the sensors 43, 44, 53 and preset control conditions. 42, 47, 48, 50, and a control unit that drives and controls the oil pump 38, the decompression pump 51, and the gas detection unit 45, and the in-oil gas monitoring device 100 is configured by 33 to 54.
[0018]
Next, the operation of the oil-in-gas monitoring apparatus 100 according to Embodiment 1 configured as described above will be described with reference to the drawings.
First, when the oil-in-gas monitoring device 100 is stopped, the switching valves 36, 40, 42, 47, 48, 50 are closed, and the three-way switching valve 37 is the oil collection chamber 33 of the second pipe 35. The oil pump 38 and the decompression pump 51 are stopped, respectively, in a state where the side and the third pipe 41 are in communication. The oil level of the insulating oil 32 in the gas extraction chamber 39 is between the oil level detection sensors 43 and 44, the space 39a formed above the pressure is reduced, and the oil collecting chamber 33 has an insulating oil 32 inside. Is full.
[0019]
Next, when a start command is received from the stop state, a measurement preparation process is executed as a first stage. First, after the fifth switching valve 47 is opened, the pressure in the space 39a in the gas extraction chamber 39 is measured by the pressure sensor 53. If the measured value is equal to or greater than a predetermined pressure value, the decompression pump 51 is turned on. By starting and opening the seventh switching valve 50, the pressure in the space 39a is reduced to a predetermined pressure value or less, and the fifth switching valve 47 and the seventh switching valve 50 are returned to the closed state again. .
[0020]
Next, oil collection processing is executed as a second stage. First, the first switching valve 36 is opened, and the three-way switching valve 37 is switched to a state in which the second pipe 35 is in communication with the tank 31 and the oil collection chamber 33, and the oil pump 38 is activated, thereby collecting the oil. The insulating oil 32 in the chamber 33 is returned into the tank 31 through the second pipe 35, and the insulating oil 32 in the tank 31 is introduced into the oil collecting chamber 33 through the first pipe 34 to collect the oil. Chamber 33 is filled with fresh insulating oil 32.
[0021]
Next, a replacement process is executed as a third stage. First, the fourth switching valve 42 is opened, and the three-way switching valve 37 is switched to a state in which the third piping 41 and the second piping 35 are connected to the oil collecting chamber 33 side. New insulating oil 32 is introduced into the gas extraction chamber 39. Next, the first switching valve 36 and the fourth switching valve 42 are closed, the third switching valve 40 is opened, the three-way switching valve 37 is connected to the second pipe 35, the tank 31 and the oil collection chamber 33. By switching to the communication state, the insulating oil 32 retained in the gas extraction chamber 39 is returned to the oil collection chamber 33, and the insulating oil 32 retained in the gas extraction chamber 39 is replaced with a new one. .
[0022]
Next, a gas extraction process is performed as a fourth stage. First, the fourth switching valve 42 is opened, and the three-way switching valve 37 is switched to a state where the third piping 41 and the second piping 35 are connected to the oil collecting chamber 33 side, and the insulating oil in the oil collecting chamber 33 is switched. 32 is forcibly circulated in the order of oil collection chamber 33 → second pipe 35 → third pipe 41 → gas extraction chamber 39 → oil collection chamber 33 by an oil pump 38 and jetted into a space 39a in the gas extraction chamber 39. In the space 39a, an amount of gas corresponding to the dissolved gas component in the insulating oil 32 is equilibratedly extracted from the volume of the space 39a and the amount of the circulating insulating oil 32.
[0023]
The time required for forced circulation of this gas extraction treatment process is as follows. The temperature of the insulating oil 32 is 20 ° C., the amount of oil is about 100 cc, the volume of the space 39a is about 50 cc, and the total amount of circulating oil is several liters / minute. Under these conditions, it has been confirmed that practically sufficient extraction can be achieved in about 15 minutes.
[0024]
Next, a gas component measurement process is executed as a fifth stage. First, the oil pump 38 is stopped, the third switching valve 40 and the fourth switching valve 42 are closed, and the fifth switching valve 47 and the sixth switching valve 48 are opened. Then, a gas suction pump (not shown) built in the gas detection unit 45 is activated to introduce the dissolved gas extracted in the space 39a of the gas extraction chamber 39 into the gas detection unit 45, and Measure ingredients. At this time, in order to efficiently introduce the dissolved gas extracted in the space 39a into the gas detection unit 45, although not shown, air is mixed into the space 39a, and the gas detection unit 45 is mixed as a mixed gas. You may make it introduce in.
Further, the mist-like oil droplet capturing filter 52 captures fine mist-like oil droplets that are generated when the insulating oil 32 is ejected into the gas extraction chamber 39 in the gas extraction processing stage. Intrusion into the decompression pump 51 and the pressure sensor 53 is prevented.
[0025]
Then, stop processing is executed as the final sixth stage. First, the decompression pump 51 is started, the sixth switching valve 48 is closed, the seventh switching valve 50 is opened, the extracted gas remaining in the gas extraction chamber 39 is discharged, and the pressure in the space 39a is reduced. After the pressure is reduced below a predetermined pressure value, the pressure reducing pump 51 is stopped, the fifth switching valve 47 and the seventh switching valve 50 are closed, and the operation is completed.
[0026]
As described above, according to the first embodiment, the gas extraction chamber 39 is connected to the upper side of the oil collection chamber 33 via the third switching valve 40, and the inside of the gas extraction chamber 39 is decompressed by the decompression pump 51. A decompressed space 39a is formed in the upper portion of the gas extraction chamber 39, and the insulating oil 32 in the oil collecting chamber 33 is jetted into the decompressed space 39a to equilibrately extract the dissolved gas in the insulating oil 32. Therefore, it is possible to easily form the decompressed space 39a without requiring a large-scale configuration such as the bellows and the driving device thereof in the conventional device, and the device is also inexpensive. The practically excellent effect can be exhibited.
[0027]
In addition, since oil level detection sensors 43 and 44 are provided in the gas extraction chamber 39 so as to detect the oil level of the insulating oil 32 retained in the gas extraction chamber 39, the pressure formed in the upper portion thereof is reduced. Since the volume of the space 39a can be accurately calculated and the amount of insulating oil to be ejected can be determined, it is possible to accurately extract the dissolved gas in the oil, and always insulate the lower part in the gas extraction chamber 39. Since the oil 32 can be retained, it is possible to prevent air from entering the oil collection chamber 33 from the gas extraction chamber 39 side, and thus to prevent the air from entering the tank 31 and lowering the insulation. It becomes possible.
[0028]
Further, since the mist-like oil droplet capturing filter 52 is provided between the gas extraction chamber 39 and the gas detection section 45, the mist-like oil droplets generated in the gas extraction chamber 39 are detected by the gas detection section 45 or the pressure sensor. 53, it is possible to prevent the pressure reducing pump 51 from entering and improve the reliability.
In the above-described configuration, the three-way switching valve 37 is used as the second switching valve. By switching this, the one oil pump 38 replaces the insulating oil 32 in the oil collection chamber 33 and the decompressed space 39a. Although the insulating oil 32 is ejected into the interior, although not shown, the third pipe 41 is directly connected to the oil collection chamber 33, and another oil pump is provided for this to perform replacement and ejection, respectively. Needless to say, another oil pump may be used.
[0029]
Embodiment 2. FIG.
FIG. 2 is a schematic diagram showing the configuration of the oil-in-gas monitoring apparatus according to Embodiment 2 of the present invention.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. An oil level detection sensor 55 is provided at a predetermined position in the oil collecting chamber 33 and detects the oil level of the insulating oil 32.
Then, by detecting the oil level of the insulating oil 32 with the oil level detection sensor 55 as described above, it is detected that there is an air layer in the oil collection chamber 33, and air enters the tank 31. It can block | prevent and the insulation fall of the insulating oil 32 can be prevented.
[0030]
Embodiment 3 FIG.
FIG. 3 is a schematic diagram showing the configuration of an oil-in-gas monitoring apparatus according to Embodiment 3 of the present invention, and FIG. 4 is a schematic diagram showing a configuration different from FIG. 3 of the oil-in-gas monitoring apparatus according to Embodiment 4 of the present invention. It is.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Reference numeral 56 denotes a mist-like oil droplet capturing filter provided in a predetermined position in the gas extraction chamber 39, that is, in the vicinity of a position where the fourth pipe 46 connecting the gas extraction chamber 39 and the gas detection unit 45 is connected. .
[0031]
Then, by providing the filter 56 for capturing the mist-like oil droplets at a predetermined position in the gas extraction chamber 39 as described above, the mist oil generated in the gas extraction chamber 39 as in the first embodiment. The droplets can be prevented from entering the gas detection unit 45, the pressure sensor 53, and the decompression pump 51 to improve the reliability, as well as the miniaturization, and as shown in FIG. Furthermore, by providing the pressure sensor 53 in the mist-like oil droplet capturing filter 56 provided in the gas extraction chamber 39, it is possible to further reduce the size.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, the first and second pipes that are connected to the tank of the oil-filled electrical device and that form the tank and the insulating oil circulation path in the tank. An oil collection chamber connected through the first and second insulating valves, and first and second switching valves connected in the middle of the first and second pipes, respectively, and one of the first and second pipes. A first oil pump that is connected in the middle, a gas extraction chamber that is connected to the upper side of the oil collection chamber via an oil collection chamber and a third switching valve, and the inside of which can be decompressed; an oil collection chamber and a gas extraction chamber; And the third switching valve and the second oil pump connected to each other in the middle, and the gas extraction chamber and the fifth switching valve are connected to each other and extracted into the gas extraction chamber. Gas detection means for measuring dissolved gas components in insulating oil. The vacuum space for balancing the extraction, it is possible to provide an oil in the gas monitoring apparatus capable of forming with a simple configuration.
[0033]
Further, according to claim 2 of the present invention, it is provided so as to be connected to the tank of the oil-filled electrical equipment, and through the first and second pipes that form the tank and the insulating oil circulation path in the tank. An oil collection chamber in which insulating oil stays, a first switching valve connected in the middle of the first pipe, and a three-way switching valve as a second switching valve connected in the middle of the second pipe; The oil pump connected between the oil collecting chamber of the second piping and the three-way switching valve is connected to the upper portion of the oil collecting chamber via the oil collecting chamber and the third switching valve so that the inside can be decompressed. A gas extraction chamber, a third pipe connected between the gas extraction chamber and the remaining one of the three-way switching valve and a fourth switching valve, and a gas extraction chamber and a fifth switching valve; And a gas detection means for measuring dissolved gas components in the insulating oil extracted through the gas extraction chamber. The reduced-pressure space for balancing extracted scan, it is possible to provide an oil in the gas monitoring apparatus capable of forming with a simple configuration.
[0034]
According to claim 3 of the present invention, since the oil level detection sensor for detecting the oil level of the insulating oil is provided at a predetermined position in the gas extraction chamber according to claim 1 or 2, accurate dissolution in oil It is possible to provide a gas-in-oil monitoring device capable of extracting a gas and preventing a decrease in insulating property of the insulating oil.
[0035]
According to claim 4 of the present invention, in claim 1 or 2, since the oil level detection sensor for detecting the oil level of the insulating oil is provided at a predetermined position in the oil collecting chamber, the insulating property of the insulating oil is reduced. It is possible to provide a gas-in-oil monitoring device capable of preventing the decrease.
[0036]
According to claim 5 of the present invention, in claim 1 or 2, since the mist-like oil droplet capturing filter is provided between the gas extraction chamber and the gas detection means, the reliability can be improved. Therefore, it is possible to provide a gas-in-oil monitoring device capable of performing
[0037]
According to the sixth aspect of the present invention, in the first or second aspect, the mist-like oil droplet trapping filter is provided in the gas extraction chamber. An apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the configuration of an in-oil gas monitoring device according to Embodiment 1 of the present invention.
FIG. 2 is a schematic diagram showing the configuration of an in-oil gas monitoring device according to Embodiment 2 of the present invention.
FIG. 3 is a schematic diagram showing a configuration of an in-oil gas monitoring device according to Embodiment 3 of the present invention.
FIG. 4 is a schematic diagram showing a configuration different from that in FIG. 3 of an in-oil gas monitoring device according to Embodiment 3 of the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a conventional oil-in-gas monitoring device.
[Explanation of symbols]
31 tank, 32 insulating oil, 33 oil collecting chamber, 34 first pipe,
35 second piping, 36 first switching valve, 37 three-way switching valve (second switching valve),
38 oil pump, 39 gas extraction chamber, 40 third switching valve, 41 third piping,
42 4th switching valve, 45 gas detection part, 47 5th switching valve,
53 pressure sensor, 55 oil level detection sensor, 56 mist-like oil droplet capturing filter,
100 Gas monitor in oil.

Claims (6)

An oil collection chamber that is connected to a tank of an oil-filled electrical device and is connected to the tank via first and second pipes that form a circulation path for insulating oil in the tank and in which the insulating oil stays. And first and second switching valves respectively connected in the middle of the first and second pipes, and a first oil pump connected in the middle of any one of the first and second pipes A gas extraction chamber that is connected to the oil collection chamber above the oil collection chamber via a third switching valve and is configured to be depressurized, and is connected between the oil collection chamber and the gas extraction chamber. And the third piping to which the fourth switching valve and the second oil pump are respectively connected, and the gas extraction chamber and the fifth switching valve connected to each other in the insulating oil extracted through the gas extraction chamber. And a gas detection means for measuring a dissolved gas component of Oil gas monitoring device for. An oil collection chamber that is connected to a tank of an oil-filled electrical device and is connected to the tank via first and second pipes that form a circulation path for insulating oil in the tank and in which the insulating oil stays. A first switching valve connected in the middle of the first pipe, a three-way switching valve as a second switching valve connected in the middle of the second pipe, and the second pipe An oil pump connected between the oil collection chamber and the three-way switching valve, and a gas extraction connected to the oil collection chamber via the oil collection chamber and the third switching valve above the oil collection chamber so that the inside can be decompressed. A third pipe connected between the chamber, the remaining one of the three-way switching valve and the gas extraction chamber, and a fourth switching valve in the middle, and the gas extraction chamber and the fifth switching valve. Gas detection for measuring dissolved gas components in the insulating oil connected through the gas extraction chamber and extracted into the gas extraction chamber Oil gas monitoring apparatus characterized by comprising a stage. The in-oil gas monitoring device according to claim 1 or 2, wherein an oil level detection sensor for detecting an oil level of the insulating oil is provided at a predetermined position in the gas extraction chamber. The in-oil gas monitoring device according to claim 1, wherein an oil level detection sensor for detecting the oil level of the insulating oil is provided at a predetermined position in the oil collection chamber. The in-oil gas monitoring device according to claim 1 or 2, wherein a filter for trapping mist-like oil droplets is provided between the gas extraction chamber and the gas detection means. The in-oil gas monitoring device according to claim 1 or 2, wherein a filter for capturing mist-like oil droplets is provided in the gas extraction chamber.

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