CN110420546B - SF6Device and method for on-site treatment of transformer with micro-water content exceeding standard - Google Patents

SF6Device and method for on-site treatment of transformer with micro-water content exceeding standard Download PDF

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Publication number
CN110420546B
CN110420546B CN201910542492.XA CN201910542492A CN110420546B CN 110420546 B CN110420546 B CN 110420546B CN 201910542492 A CN201910542492 A CN 201910542492A CN 110420546 B CN110420546 B CN 110420546B
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valve
gas
tank
transformer
storage tank
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CN110420546A (en
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张磊
陈梁远
黎大健
赵坚
张玉波
颜海俊
余长厅
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • B01D53/261Drying gases or vapours by adsorption
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B3/00Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/80Water

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Drying Of Gases (AREA)

Abstract

The invention discloses an SF6 mutual inductor micro water content exceeding field treatment device, wherein a first valve is connected with a mutual inductor and is respectively connected with a second valve, a third valve and a ninth valve; the second valve is connected with the first air tank; the third valve is connected with the first storage tank; the first storage tank is connected with a fourth valve, and the fourth valve is connected with the drying tank; the drying tank is connected with a fifth valve, the fifth valve is connected with the air inlet end of the compressor, and the air outlet end of the compressor is connected with a sixth valve; the sixth valve is respectively connected with the seventh valve and the second storage tank; the seventh valve is connected with the air inlet end of the vacuum pump, and the air outlet end of the vacuum pump is communicated with the atmosphere; a second pressure gauge for detecting the air pressure of the section is arranged between the seventh valve and the vacuum pump; the second storage tank is connected with an eighth valve, and the eighth valve is respectively connected with a ninth valve and a tenth valve; the tenth valve is connected with the second air tank. SF6 gas in the transformer can be dried under the condition of no power failure, and the device is simple in structure and convenient to operate.

Description

SF 6 mutual inductor micro-water content exceeding field processing device and method
Technical Field
The invention relates to the technical field of drying treatment of SF 6 of power equipment, in particular to an on-site treatment device and method for exceeding micro-water content of an SF 6 transformer.
Background
The SF 6 gas-insulated transformer is widely adopted due to the excellent electrical performance, and as the SF 6 transformer is applied to a power grid, the defects of exceeding the standard of micro water content and excessively fast growth of the transformer are in an ascending trend, and once the inside of the transformer is wetted, the electrical strength is obviously reduced, so that the safe operation of equipment is seriously affected. In recent years, the humidity content of the SF 6 transformer is generally out of standard, and in the running process, the excessively high humidity has the risk of generating acidic substances with extremely strong corrosiveness through decomposition reaction with the SF 6, so that the performance of metal parts and sealing insulating materials in equipment is seriously influenced, the insulating performance of the equipment is reduced, and the service life of the equipment is shortened.
The method adopted after the micro water content of the SF 6 transformer exceeds the standard at present is as follows: 1) And (5) performing on-site ventilation treatment. This is a commonly used method, which can dry the moisture in the gas, but requires power failure treatment; 2) And (5) returning to a factory for treatment. The method is thorough, but has long period, high cost and influence on the power failure time. The treatment mode adopted for SF 6 micro water standard exceeding treatment is to cut off the equipment, the treatment time is long, and the process flow is complex.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
The SF 6 mutual inductor micro water content exceeding field treatment device comprises a first valve, a second valve, a first air tank, a third valve, a first pressure gauge, a first storage tank, a fourth valve, a drying tank, a fifth valve, a compressor, a sixth valve, a vacuum pump, a second pressure gauge, a seventh valve, a second storage tank, an eighth valve, a ninth valve, a tenth valve and a second air tank;
One end of the first valve is connected with the transformer, and the other end of the first valve is respectively connected with one end of the second valve, one end of the third valve and one end of the ninth valve;
The other end of the second valve is connected with the first air tank;
The other end of the third valve is connected with one end of the first storage tank, and a first pressure gauge is arranged between the third valve and the first storage tank;
the other end of the first storage tank is connected with one end of a fourth valve, and the other end of the fourth valve is connected with one end of the drying tank;
the other end of the drying tank is connected with one end of a fifth valve, the other end of the fifth valve is connected with the air inlet end of the compressor, and the air outlet end of the compressor is connected with one end of a sixth valve;
the other end of the sixth valve is connected with one end of the seventh valve and one end of the second storage tank respectively;
the other end of the seventh valve is connected with the air inlet end of the vacuum pump, and the air outlet end of the vacuum pump is communicated with the atmosphere;
A second pressure gauge is arranged between the seventh valve and the vacuum pump;
the other end of the second storage tank is connected with one end of an eighth valve, and the other end of the eighth valve is respectively connected with the other end of the ninth valve and one end of the tenth valve;
the other end of the tenth valve is connected with a second gas tank.
Preferably, the first gas tank is filled with high-purity SF 6 gas or N 2 gas.
Preferably, the drying tank is filled with an adsorbent for absorbing moisture.
Preferably, the pressure meter further comprises a control unit, wherein the input end of the control unit is respectively connected with the signal output ends of the first pressure meter and the second pressure meter and is used for reading the pressure value;
The output end of the control unit is respectively connected with the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve and used for controlling the actions of the valves;
the output end of the control unit is also connected with the compressor and the vacuum pump and used for controlling the operation of the compressor and the vacuum pump.
Preferably, the first pressure gauge can visually display the pressure value and can transmit a pressure signal to the control unit through a cable or a wire;
The second pressure gauge can visually display the pressure value and can transmit a pressure signal to the control unit through a cable or a wire.
Preferably, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are all normally closed electromagnetic valves.
In order to facilitate operation, the invention provides an SF 6 transformer micro-water content exceeding field treatment method based on the SF 6 transformer micro-water content exceeding field treatment device, which comprises the following steps:
S1, vacuumizing to condense water vapor: the third valve, the fourth valve, the ninth valve, the eighth valve and the seventh valve are controlled to be in a power-on state, and then the vacuum pump is controlled to start to operate, so that gas is finally discharged from the vacuum pump through the drying tank, the fourth valve, the first storage tank, the third valve, the ninth valve, the eighth valve, the second storage tank and the seventh valve, and finally the air pressure in the pipeline and the tank is reduced to be condensed into liquid;
s2, exhausting and dehumidifying: after the vacuumizing operation of the S1 is completed, the control unit controls the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the eighth valve and the tenth valve to be opened electrically, and controls the compressor to be operated electrically, so that SF 6 gas or N 2 gas passes through the second valve, the third valve, the first storage tank, the fourth valve, the drying tank, the fifth valve, the compressor, the sixth valve, the second storage tank, the eighth valve and the tenth valve from the first gas tank to enter the second gas tank; in the flowing process of SF 6 gas or N 2 gas, absorbing the water vapor vacuumized and condensed in the step S1 and taking the water vapor away, finally storing the water vapor in a second gas tank, and controlling all electromagnetic valves and compressors to be powered off after a certain time of operation;
S3, taking SF 6 gas out of the transformer: after the step of exhausting and dehumidifying in the S2 is completed, the first valve and the third valve are controlled to be electrically opened, so that SF 6 gas in the transformer enters the first storage tank through the first valve and the third valve; when the pressure value detected by the first pressure gauge reaches the minimum allowable pressure of the transformer, the third valve is controlled to be turned off, and the step of taking SF 6 gas out of the transformer is completed;
s4, dehumidification and reflux of SF 6 gas: after the step of S3 taking SF 6 gas out of the transformer is completed, the fourth valve, the fifth valve, the sixth valve, the eighth valve and the ninth valve are controlled to be opened in an electric mode, and a compressor is controlled to start, so that SF 6 gas in the first storage tank returns to the transformer through the fourth valve, the drying tank, the fifth valve, the compressor, the sixth valve, the second storage tank, the eighth valve, the ninth valve and the first valve;
In the process of SF 6 gas flowing, the moisture is absorbed by the adsorbent in the drying tank when passing through the drying tank, so that the aim of dehumidification and drying is fulfilled.
Preferably, the air pressure in step S1 is reduced, and the air pressure is 0.1MPa.
Preferably, the transformer in step S3 allows a minimum pressure of 0.3 MPa.
The invention can realize the drying treatment of SF 6 transformer gas without power failure by adopting only a plurality of tanks and valves, and the adopted method is simple and easy to realize, thereby not only skillfully solving the difficult problems of exceeding the standard of SF 6 gas humidity and not allowing power failure treatment in the actual application process, but also having great significance for guaranteeing the safe and reliable supply of equipment and having wide popularization and application values.
Drawings
FIG. 1 is a block diagram of an apparatus provided by the present invention;
FIG. 2 is a diagram of the airflow path during a vacuum operation;
FIG. 3 is a diagram of the airflow path during a dehumidification operation;
FIG. 4 is a flow path diagram during an inflation operation;
fig. 5 is a flow path diagram at the time of the dehumidification return operation.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to fig. 1 to 5 in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
As shown in fig. 1, the on-site treatment device for the micro water content exceeding of the SF 6 transformer comprises a first valve 2, a second valve 3, a first air tank 4, a third valve 5, a first pressure gauge 6, a first storage tank 7, a fourth valve 8, a drying tank 9, a fifth valve 10, a compressor 11, a sixth valve 12, a vacuum pump 13, a second pressure gauge 14, a seventh valve 15, a second storage tank 16, an eighth valve 17, a ninth valve 18, a tenth valve 19 and a second air tank 20.
In order to facilitate automatic control, the valves are normally closed electromagnetic valves, namely, the electromagnetic valves are in a closed state when the electromagnetic valve coil is not electrified. Of course, if manual operation is selected, a common manual valve may be used, and is not particularly limited herein.
One end of the first valve 2 is connected with the transformer 1 through an air pipe, and the other end of the first valve 2 is respectively connected with one end of the second valve 3, one end of the third valve 5 and one end of the ninth valve 18 through an air pipe.
The other end of the second valve 3 is connected with the first air tank 4 through an air pipe. The first gas tank 4 is filled with high-purity SF 6 gas or N 2 gas.
The other end of the third valve 5 is connected with one end of the first storage tank 7 through an air pipe, and a first pressure gauge 6 for detecting the pressure of the air pipe of the section is further arranged on the air pipe between the third valve 5 and the first storage tank 7.
The first pressure gauge 6 can visually display the pressure value and can transmit a pressure signal to the control unit via a cable or wire.
The other end of the first storage tank 7 is connected with one end of a fourth valve 8 through an air pipe, and the other end of the fourth valve 8 is connected with one end of a drying tank 9.
The drying tank 9 is filled with an adsorbent for absorbing moisture.
The other end of the drying tank 9 is connected with one end of a fifth valve 10 through an air pipe, the other end of the fifth valve 10 is connected with the air inlet end of a compressor 11 through an air pipe, and the air outlet end of the compressor 11 is connected with one end of a sixth valve 12 through an air pipe.
The other end of the sixth valve 12 is connected with one end of the seventh valve 15 and one end of the second storage tank 16 through air pipes respectively;
the other end of the seventh valve 15 is connected with the air inlet end of the vacuum pump 13 through an air pipe, and the air outlet end of the vacuum pump 13 is communicated with the atmosphere. A second pressure gauge 14 for detecting the air pressure of the section is arranged on the air pipe between the seventh valve 15 and the vacuum pump 13.
The second pressure gauge 14 is capable of visually displaying the pressure value and transmitting a pressure signal to the control unit via a cable or wire.
The other end of the second storage tank 16 is connected with one end of an eighth valve 17 through an air pipe, and the other end of the eighth valve 17 is respectively connected with the other end of a ninth valve 18 and one end of a tenth valve 19 through an air pipe.
The other end of the tenth valve 19 is connected to the second gas tank 20 through a gas pipe.
The input end of the control unit is respectively connected with the signal output ends of the first pressure gauge 6 and the second pressure gauge 14 and is used for reading the pressure value. The output end of the control unit is respectively connected with the first valve to the tenth valve and used for controlling the actions of the valves. The output of the control unit is furthermore connected to the compressor 11 and the vacuum pump 13 for controlling the operation of the compressor 11 and the vacuum pump 13. The control unit can adopt PLC to realize control, has analog input and output, and can conveniently realize pressure reading and control of a valve, a compressor and a vacuum pump. For example, the frequency conversion control of the compressor and the vacuum pump can be realized by matching an analog output mode with a frequency converter, and the control can be realized by directly adopting a contactor. Since the control method is a very common method, there is no particular point, and it is not specifically described here.
In addition, for convenient carrying, the SF 6 micro-water content exceeding field treatment device can be provided with a shell, and the valve, the tank body, the compressor and the vacuum pump are arranged in the shell, so that the transportation and the maintenance are convenient.
When the SF 6 gas in the transformer 1 needs to be dehumidified, four steps can be performed in total: and vacuumizing to condense water vapor, exhausting and dehumidifying, and taking SF 6 gas out of the transformer and dehumidifying and refluxing SF 6 gas. Specifically:
In the initial state, all solenoid valves are shut off, and the compressor 11 and the vacuum pump 13 are stopped.
1. Vacuumizing to condense the water vapor: as shown in fig. 2, the control unit controls the third valve 5, the fourth valve 8, the ninth valve 18, the eighth valve 17 and the seventh valve 15 to be in the power-on state, and then controls the vacuum pump 13 to start running.
The gas path in the device is shown by the broken line in fig. 2, and the gas is finally discharged from the vacuum pump 13 through the drying tank 9, the fourth valve 8, the first storage tank 7, the third valve 5, the ninth valve 18, the eighth valve 17, the second storage tank 16 and the seventh valve 15.
When the gas in the pipeline and the tank body is discharged, the internal gas pressure is reduced, and the water vapor in the pipeline and the tank body is condensed into a liquid state. The control unit samples the first pressure gauge 6, and when the air pressure in the pipeline reaches a certain value, the vacuumizing operation is stopped to condense the water vapor.
The air pressure set value can be adjusted according to the requirement, in this embodiment, taking 0.1MPa as an example, when the value of the pressure gauge 6 reaches 0.1MPa, the control unit controls the vacuum pump 13, the ninth valve 18 and the seventh valve 15 to stop working, and the vacuumizing in the first step is completed to enable the vapor condensation operation.
2. Exhausting and dehumidifying: after the first step of vacuumizing to enable the water vapor to condense, the control unit controls the second valve 3, the third valve 5, the fourth valve 8, the fifth valve 10, the sixth valve 12, the eighth valve 17 and the tenth valve 19 to be electrically opened, and controls the compressor 11 to be electrically operated.
As shown in fig. 3, the gas path in the device is shown by a dotted line in the figure, and the high-purity SF 6 gas or N 2 gas passes through the second valve 3, the third valve 5, the first storage tank 7, the fourth valve 8, the drying tank 9, the fifth valve 10, the compressor 11, the sixth valve 12, the second storage tank 16, the eighth valve 17, and the tenth valve 19 from the first gas tank 4 to the second gas tank 20. After a certain time of operation, the control unit controls all the electromagnetic valves and the compressor to be powered off and restore to the initial state.
During the gas flow, the water vapor just condensed by vacuum is absorbed and carried away, and finally stored in the second gas tank 20, thereby completing the operation of exhausting and dehumidifying the pipes and the respective tanks.
The two steps are mainly used for removing water vapor in the device pipeline and the tank body and removing residual gas, so that the subsequent dehumidification operation of the SF 6 gas of the transformer is facilitated.
3. SF 6 gas is taken out of the transformer: after the exhaust dehumidification step is completed, the control unit controls the first valve 2 and the third valve 5 to be electrically opened.
As shown in fig. 4, since the rated pressure of SF 6 gas in the transformer 1 is generally 0.35-0.4MPa, which is higher than the pressure in the first storage tank 7, SF 6 gas in the transformer 1 enters the first storage tank 7 through the first valve 2 and the third valve 5. When the pressure value of the first pressure gauge 6 reaches the minimum allowable pressure of the transformer, which is generally 0.3 MPa, the control unit controls the third valve 5 to be closed, and the step of taking SF 6 gas out of the transformer is completed.
4. SF 6 gas dehumidifies and returns: after the step of taking SF 6 gas out of the transformer is completed, the control unit controls the fourth valve 8, the fifth valve 10, the sixth valve 12, the eighth valve 17 and the ninth valve 18 to be electrically opened, and controls the compressor 11 to be started.
As shown in fig. 5, SF 6 gas in the first tank 7 returns to the transformer 1 through the fourth valve 8, the drying tank 9, the fifth valve 10, the compressor 11, the sixth valve 12, the second tank 16, the eighth valve 17, the ninth valve 18, and the first valve 2. In the process of SF 6 gas flowing, moisture is absorbed by the adsorbent in the drying tank 9 when passing through the drying tank 9, so that the aim of dehumidification and drying is fulfilled.
In addition, in the SF 6 gas dehumidification reflux of the step 4, a relatively slow dehumidification method can be adopted. After the step 3 is completed, the fourth valve 8, the fifth valve 10 and the sixth valve 12 are controlled to be opened and the compressor 11 is controlled to work slowly by utilizing the characteristic that the pressure of the first storage tank 7 is higher than that of the second storage tank 16, so that the gas in the first storage tank 7 slowly passes through the drying tank 9 to realize the effect of full moisture absorption and dehumidification. When the pressure in the first tank 7 is equal to the pressure in the second tank 16, it is fed into the transformer 1. The loop is the same as the loop of step 4.
Through the repeated operation of the 4 steps, the SF 6 gas in the transformer 1 can be subjected to comprehensive drying treatment. The invention can realize the drying treatment of SF 6 gas without power failure by adopting only a plurality of tanks and valves, and the adopted method is simple and easy to realize, thus not only skillfully solving the difficult problems of exceeding the standard of SF 6 gas humidity and not allowing power failure treatment in the actual application process, but also having great significance for guaranteeing the safe and reliable supply of equipment and having wide popularization and application values.

Claims (9)

1. An SF 6 mutual inductor micro-water content exceeds standard on-site processing device which is characterized in that:
The device comprises a first valve (2), a second valve (3), a first gas tank (4), a third valve (5), a first pressure gauge (6), a first storage tank (7), a fourth valve (8), a drying tank (9), a fifth valve (10), a compressor (11), a sixth valve (12), a vacuum pump (13), a second pressure gauge (14), a seventh valve (15), a second storage tank (16), an eighth valve (17), a ninth valve (18), a tenth valve (19) and a second gas tank (20);
One end of the first valve (2) is connected with the transformer (1), and the other end of the first valve (2) is respectively connected with one end of the second valve (3), one end of the third valve (5) and one end of the ninth valve (18);
the other end of the second valve (3) is connected with the first air tank (4);
The other end of the third valve (5) is connected with one end of the first storage tank (7), and a first pressure gauge (6) is arranged between the third valve (5) and the first storage tank (7);
The other end of the first storage tank (7) is connected with one end of a fourth valve (8), and the other end of the fourth valve (8) is connected with one end of a drying tank (9);
The other end of the drying tank (9) is connected with one end of a fifth valve (10), the other end of the fifth valve (10) is connected with the air inlet end of the compressor (11), and the air outlet end of the compressor (11) is connected with one end of a sixth valve (12);
the other end of the sixth valve (12) is respectively connected with one end of the seventh valve (15) and one end of the second storage tank (16);
the other end of the seventh valve (15) is connected with the air inlet end of the vacuum pump (13), and the air outlet end of the vacuum pump (13) is communicated with the atmosphere;
A second pressure gauge (14) is arranged between the seventh valve (15) and the vacuum pump (13);
The other end of the second storage tank (16) is connected with one end of an eighth valve (17), and the other end of the eighth valve (17) is respectively connected with the other end of a ninth valve (18) and one end of a tenth valve (19);
the other end of the tenth valve (19) is connected with a second gas tank (20).
2. The SF 6 transformer micro-water content out-of-specification field processing device of claim 1, wherein:
The first gas tank (4) is filled with SF 6 gas or N 2 gas with high purity.
3. The SF 6 transformer micro-water content out-of-specification field processing device of claim 1, wherein:
The drying tank (9) is filled with an adsorbent for absorbing moisture.
4. The SF 6 transformer micro-water content out-of-specification field processing device of claim 1, wherein:
The pressure meter further comprises a control unit, wherein the input end of the control unit is respectively connected with the signal output ends of the first pressure gauge (6) and the second pressure gauge (14) and is used for reading the pressure value;
The output end of the control unit is respectively connected with the first valve (2), the second valve (3), the third valve (5), the fourth valve (8), the fifth valve (10), the sixth valve (12), the seventh valve (15), the eighth valve (17), the ninth valve (18) and the tenth valve (19) for controlling the actions of the valves;
The output end of the control unit is also connected with the compressor (11) and the vacuum pump (13) and is used for controlling the operation of the compressor (11) and the vacuum pump (13).
5. The SF 6 transformer micro-water content out-of-specification field processing device of claim 4, wherein:
the first pressure gauge (6) can visually display the pressure value and can transmit a pressure signal to the control unit through a cable or a wire;
the second pressure gauge (14) can visually display the pressure value and can transmit a pressure signal to the control unit via a cable or wire.
6. The SF 6 transformer micro-water content out-of-specification field processing device of claim 1, wherein:
The first valve (2), the second valve (3), the third valve (5), the fourth valve (8), the fifth valve (10), the sixth valve (12), the seventh valve (15), the eighth valve (17), the ninth valve (18) and the tenth valve (19) are normally closed electromagnetic valves.
7. An SF 6 transformer micro-water content exceeding field treatment method based on the SF 6 transformer micro-water content exceeding field treatment device disclosed in any one of claims 1-6, which is characterized by comprising the following steps:
S1, vacuumizing to condense water vapor: the third valve (5), the fourth valve (8), the ninth valve (18), the eighth valve (17) and the seventh valve (15) are controlled to be in a power-on state, and then the vacuum pump (13) is controlled to start to operate, so that gas passes through the drying tank (9), the fourth valve (8), the first storage tank (7), the third valve (5), the ninth valve (18), the eighth valve (17), the second storage tank (16) and the seventh valve (15) and is finally discharged from the vacuum pump (13), and finally the air pressure in the pipeline and the tank body is reduced to be condensed into a liquid state;
S2, exhausting and dehumidifying: after the vacuumizing operation of the S1 is completed, the control unit controls the second valve (3), the third valve (5), the fourth valve (8), the fifth valve (10), the sixth valve (12), the eighth valve (17) and the tenth valve (19) to be electrically opened, and controls the compressor (11) to be electrically operated, so that SF 6 gas or N 2 gas enters the second gas tank (20) from the first gas tank (4) through the second valve (3), the third valve (5), the first storage tank (7), the fourth valve (8), the drying tank (9), the fifth valve (10), the compressor (11), the sixth valve (12), the second storage tank (16), the eighth valve (17) and the tenth valve (19); in the flowing process of SF 6 gas or N 2 gas, absorbing the water vapor condensed in the vacuumizing in the step S1 and taking the water vapor away, finally storing the water vapor in a second gas tank (20), and controlling all electromagnetic valves and compressors to be powered off after a certain time of operation;
S3, taking SF 6 gas out of the transformer: after the step of exhausting and dehumidifying in the S2 is finished, the first valve (2) and the third valve (5) are controlled to be electrically opened, so that SF 6 gas in the transformer (1) enters the first storage tank (7) through the first valve (2) and the third valve (5); when the pressure value detected by the first pressure gauge (6) reaches the minimum allowable pressure of the transformer, the third valve (5) is controlled to be closed, and the step of taking SF 6 gas out of the transformer is completed;
S4, dehumidification and reflux of SF 6 gas: after the step of taking SF 6 gas out of the mutual inductor is completed, the fourth valve (8), the fifth valve (10), the sixth valve (12), the eighth valve (17) and the ninth valve (18) are controlled to be opened electrically, and the compressor (11) is controlled to be started, so that SF 6 gas in the first storage tank (7) returns to the mutual inductor (1) through the fourth valve (8), the drying tank (9), the fifth valve (10), the compressor (11), the sixth valve (12), the second storage tank (16), the eighth valve (17), the ninth valve (18) and the first valve (2);
in the process of SF 6 gas flowing, moisture is absorbed by the adsorbent in the drying tank (9) when passing through the drying tank (9), so that the aim of dehumidification and drying is fulfilled.
8. The SF 6 transformer micro-water content out-of-specification field processing method of claim 7, wherein the method comprises the following steps:
The air pressure in step S1 was reduced to a value of 0.1MPa.
9. The SF 6 transformer micro-water content out-of-specification field processing method of claim 7, wherein the method comprises the following steps:
the transformer in step S3 allows a minimum pressure of 0.3 MPa.
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CN111389173B (en) * 2020-03-31 2024-06-21 马鞍山钢铁股份有限公司 SF6 water content exceeding on-line treatment device
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