CN114811428A - Micro-water standard exceeding treatment method for 220KV GIS air chamber - Google Patents
Micro-water standard exceeding treatment method for 220KV GIS air chamber Download PDFInfo
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- CN114811428A CN114811428A CN202210445713.3A CN202210445713A CN114811428A CN 114811428 A CN114811428 A CN 114811428A CN 202210445713 A CN202210445713 A CN 202210445713A CN 114811428 A CN114811428 A CN 114811428A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
- F17D3/145—Arrangements for supervising or controlling working operations for eliminating water in gas pipelines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/0447—Composition; Humidity
- F17C2250/046—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
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Abstract
The invention discloses a method for treating excessive micro-water for a 220KV GIS gas chamber, which comprises the following steps: s1, recovering SF6 gas in the GIS gas chamber with excessive micro-water content; s2, carrying out pressure reduction treatment on adjacent air chambers; s3, vacuumizing the GIS air chamber with excessive micro-water; s4, injecting pure and dry nitrogen; s5, heating the outer wall of the air chamber; s6, detecting the micro water content of the nitrogen, entering S7 if the micro water content of the nitrogen reaches a preset value, otherwise, releasing the nitrogen and returning to S3; s7, releasing nitrogen, vacuumizing and injecting SF6 gas. The technical scheme can discharge the moisture in the parts in the GIS air chamber, thereby avoiding the excessive micro-water in the GIS air chamber caused by the rise of the temperature, and simultaneously avoiding the damage to the adjacent air chambers when the micro-water in the GIS air chamber is processed.
Description
Technical Field
The invention relates to the technical field of gas insulated switches, in particular to a method for treating excessive micro-water in a 220KV GIS gas chamber.
Background
In a preventive test of the overhaul in spring of 2017, SF6 gas micro-water exceeding is found in 7 gas chambers of 22OKV GIS with CT in the valley power station; in the spring overhaul period of 2018, factory technicians perform professional micro-water treatment on the air chamber with excessive micro-water, and after treatment, the micro-water in SF6 gas in the air chamber is detected to be less than 100 ul/L. In a preventive test of spring overhaul in 2020, the trace moisture of gas in 4 gas chambers SF6 such as 2012QS, 2022QS, 2032QS and 2052QS is found to be seriously overproof (all are more than 500ul/L), wherein the trace moisture of gas in 2022QS gas chamber SF6 reaches 800 ul/L; in two years of operation, gas micro water in a gas chamber SF6 with a CT of the GIS rises rapidly, and the safe operation of 220KV GIS equipment of a valley power station and the sending of loads in the station are seriously influenced.
The reason for the excessive micro-water in the GIS air chamber mainly comprises the following points: (1) in the transportation and storage of the GIS, due to improper protection facilities and factors such as the environmental temperature and humidity of a storehouse, a basin-type insulator, an air chamber and a bus of the GIS air chamber are affected with damp; (2) in the installation process of the GIS, due to factors such as moisture in the air, moisture brought by an insulating part, moisture brought by an adsorbent, moisture contained in new SF6 gas, poor filling process, poor vacuumizing process, incomplete treatment of elements such as a pipeline joint and the like, the excessive moisture of a GIS air chamber is caused; (3) moisture and water vapor which are permeated from a SF6 gas leakage point in the operation process permeate into the gas chamber through a weak sealing link of the equipment, so that the GIS gas chamber is affected with damp and the micro water content exceeds the standard; (4) the current transformer and the isolation switch share one air chamber, and the current transformer does not adopt an epoxy pouring type equal-moisture-proof structure. The moisture remained in the GIS air chamber, particularly the moisture remained in the CT coil or on the insulating part is difficult to discharge at one time, and the moisture remained in the air chamber is slowly released into the air chamber along with the increase of the running time and the increase of the introduced current, so that the gaseous micro-water of SF6 exceeds the standard.
At present, the conventional process flow for treating the trace water in the GIS gas chamber mainly comprises the steps of recovering SF6 gas, drying an adsorbent, vacuumizing the GIS gas chamber, injecting nitrogen for multiple times for replacement and detecting the trace water content until the trace water detection of the gas reaches the standard, and then injecting SF6 gas.
However, in this way, the boiling point of water is reduced when the GIS gas chamber is vacuumized, the gasification speed is faster, the moisture on the inner wall of the GIS gas chamber, the surface of each part and the surface of the insulating material is continuously extracted in the form of water vapor, but the moisture remained in the parts and the insulating material is difficult to extract, the moisture remained in the gas chamber is continuously evaporated along with the increase of the surface temperature of the GIS gas chamber in summer and the increase of the internal temperature caused by the larger current supplied to the conductor, and the micro-water in the gas chamber is increased after the moisture absorbent is saturated. In addition, negative pressure formed by vacuumizing in the existing mode is easy to damage adjacent GIS air chambers which are not vacuumized, the basin-type insulator is especially easy to crack, and once a problem occurs, the consequence caused by excessive moisture in the GIS air chambers is far higher than that caused by excessive moisture in the GIS air chambers.
Disclosure of Invention
Aiming at the problems, the invention provides a method for treating excessive micro-water in a 220KV GIS air chamber, which can discharge the water in the parts in the GIS air chamber, thereby avoiding the excessive micro-water in the GIS air chamber caused by the temperature rise, and simultaneously avoiding the damage to the adjacent air chamber when treating the micro-water in the GIS air chamber.
The technical scheme of the invention is as follows:
a micro-water overproof treatment method for a 220KV GIS air chamber comprises the following steps: s1, recovering SF6 gas in the GIS gas chamber with excessive micro-water content; s2, carrying out pressure reduction treatment on the gas chamber adjacent to the GIS gas chamber with excessive micro-water content, wherein the pressure after pressure reduction is 0.4-0.6 times of the rated pressure; s3, vacuumizing the GIS air chamber with excessive micro water content, stopping when the vacuum degree is below a first calibration value, keeping the preset time length, and not exceeding a second calibration value in repeated time measurement, otherwise, continuously vacuumizing until the conditions are met; wherein the first calibration value is between 0.4 and 0.6mbar, the second calibration value is higher than the first calibration value and is between 0.8 and 1.2mbar, and the preset time period is between 30 and 60 min; s4, injecting pure and dry nitrogen into the GIS gas chamber with excessive micro-water until the pressure of the nitrogen reaches a third calibration value; wherein the third calibration value is between 0.1 and 0.3 MPa; s5, heating the outer wall of the aluminum cylinder of the micro-water content exceeding GIS air chamber, controlling the temperature at 50-80 ℃, and continuing for a period of time to evaporate water remained in the parts in the micro-water content exceeding GIS air chamber into nitrogen; s6, detecting the micro water content in the nitrogen, releasing the nitrogen if the micro water content does not reach a preset value, and returning to the step S3; if the micro water content reaches the preset value, the step S7 is carried out; and S7, releasing nitrogen, vacuumizing, filling the GIS gas chamber with excessive micro water into SF6 gas which is qualified in the test until the rated pressure is reached, and supplementing the SF6 gas pressure of the adjacent gas chamber to the rated pressure.
The working principle of the technical scheme is as follows:
before the GIS air chamber with excessive micro-water content is vacuumized, the pressure reduction treatment is firstly carried out on the air chamber adjacent to the GIS air chamber, so that the phenomenon that the basin-type insulator and other parts of the adjacent air chamber are damaged due to the tensile fracture caused by negative pressure formed by vacuumization in the vacuumizing process to cause larger accidents is prevented; meanwhile, the outer wall of an aluminum cylinder of the GIS air chamber with excessive micro-water content is heated, the temperature of 50-80 ℃ is kept, the temperature cannot cause damage to the paint surface of the tank body of the air chamber, an internal current transformer and a sealing piece, the inner wall of the air chamber, parts and insulating materials are heated by utilizing the heat transfer principle, so that the internal water content is evaporated into steam, the steam is discharged by utilizing nitrogen replacement and vacuumizing modes, and the content of the internal water content is judged by detecting the micro-water content of the nitrogen until the water reaches the standard; secondly, the treatment method can be implemented by using the SF6 gas recovery device of each station and factory and the purchase heating device without purchasing too much equipment.
In a further technical scheme, in step S6, after the micro water content of the nitrogen gas is measured, if the micro water content does not reach a preset value, one or more of the number of subsequent nitrogen gas replacements, the heating time or the number and time of vacuum pumping are determined according to the micro water content.
Through this setting, confirm subsequent relevant technological parameter according to the little water content who records, can effectively guarantee that the evaporation of water in the air chamber is abundant, avoid leaving the hidden danger.
In a further technical scheme, heating the outer wall of the aluminum cylinder specifically comprises: but aluminium section of thick bamboo outer wall adopts the liquefied gas tank heating band of automatically regulated temperature to heat an aluminium section of thick bamboo, the outside parcel of liquefied gas tank heating band has the thermal-insulated cotton of one deck, through the aluminium jar of little water exceeds standard GIS air chamber is heated and makes the inside spare part temperature of air chamber rise.
Through setting up liquefied gas storage tank heating band, the coverage area is wide, and the inside spare part of air chamber is heated evenly, and the temperature controllability is good, and the outside covers the thermal-insulated cotton of one deck simultaneously, also more does benefit to the invariant that keeps the temperature, reduces the heat and runs off.
In a further technical scheme, the first calibration value is between 0.45 +/-0.05 mbar, and the second calibration value is between 0.85 +/-0.05 mbar.
In a further technical scheme, the preset time is 45 +/-5 min.
In a further technical scheme, the third calibration value is within 0.2 +/-0.05 MPa.
In a further technical scheme, in the step S5, the heating is carried out to control the temperature to be 60-70 ℃.
In a further technical scheme, in step S7, the vacuumizing process may be stopped when the static vacuum degree reaches below a fourth calibration value, the time is kept for 30-60min, and the fifth calibration value is not exceeded during repeated measurement, otherwise, the vacuumizing process is continued until the condition is met; and the fourth calibration value of the static vacuum degree is between 0.4 and 0.6mbar, the fifth calibration value is higher than the fourth calibration value, and the fifth calibration value is between 0.5 and 0.7 mbar.
Through the arrangement, nitrogen, residual air and the like in the GIS air chamber with excessive micro water content are fully sucked out, and the purity of the subsequently entering SF6 gas is ensured.
In a further technical solution, the method further includes step S8: standing the GIS air chamber with the excessive micro water for a period of time, measuring the micro water content of the GIS air chamber, if the micro water content reaches the standard, successfully processing, and otherwise returning to the step S3; wherein the standing time is more than 24 hours.
The stability of the micro water treatment is improved by setting the step S8.
In a further technical scheme, in the step S5, the period of time in the first time is 8-12h, and the duration of each subsequent time is not increased.
The moisture that contains in the inside spare part of air chamber reduces gradually, and the time that needs heating of next time can not be more than the previous time, when using sparingly.
The invention has the beneficial effects that:
1. before the GIS air chamber with excessive micro-water content is vacuumized, the pressure reduction treatment is firstly carried out on the air chamber adjacent to the GIS air chamber, so that the phenomenon that the basin-type insulator and other parts of the adjacent air chamber are damaged due to the tensile fracture caused by negative pressure formed by vacuumization in the vacuumizing process to cause larger accidents is prevented; meanwhile, the outer wall of an aluminum cylinder of the GIS gas chamber with excessive micro-water content is heated, the temperature of 50-80 ℃ is kept, the inner wall of the gas chamber, parts and insulating materials are heated by utilizing the heat transfer principle, so that the internal water content is evaporated into steam, the steam is discharged by utilizing the nitrogen displacement and vacuumizing modes, and the content of the internal water content is judged by detecting the micro-water content of the nitrogen until the water reaches the standard; secondly, the treatment method can be implemented by utilizing the own SF6 gas recovery device and the purchased heating device of each station and factory without purchasing too much equipment;
2. subsequent relevant process parameters are determined according to the measured micro-water content, so that the full evaporation of water in the air chamber can be effectively ensured, and hidden dangers are avoided;
3. by arranging the heating belt of the liquefied gas tank, the coverage area is wide, parts in the gas chamber are heated uniformly, the temperature controllability is good, and meanwhile, the heat insulation cotton layer is covered outside the gas chamber, so that the constant temperature is kept, and the heat loss is reduced;
4. by the arrangement, nitrogen, residual air and the like in the GIS gas chamber with excessive micro-water content are fully sucked out, and the purity of the subsequently-entering SF6 gas is ensured;
5. the moisture that contains in the inside spare part of air chamber reduces gradually, and the time that needs heating of next time can not be more than the previous time, when using sparingly.
Drawings
FIG. 1 is a flow chart of a method for treating excessive micro-water in a 220KV GIS gas chamber according to an embodiment of the invention;
fig. 2 is a flow chart of a method for treating excessive micro-water in a 220kv GIS gas chamber in an example of the invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
Examples
As shown in fig. 1, a method for treating excessive micro-water in a 220kv GIS gas chamber comprises the following steps:
and S1, recovering SF6 gas in the GIS gas chamber with excessive micro-water. For example, SF6 gas of an isolation switch, a grounding switch, a breaker and a bus bar cylinder in a GIS gas chamber with excessive micro-water is recovered. Here, the GIS gas cell with excessive micro-water content means a GIS gas cell with a micro-water content exceeding a set standard value after detection, and SF6 gas is in the GIS gas cell.
And S2, carrying out pressure reduction treatment on the gas chamber adjacent to the GIS gas chamber with excessive micro water, wherein the pressure after pressure reduction is 0.4-0.6 times of the rated pressure. For example, the depressurization process may be a half-pressure reduction process.
S3, vacuumizing the GIS air chamber with excessive micro water content, stopping when the vacuum degree is below a first calibration value, keeping the preset time length, and not exceeding a second calibration value in repeated time measurement, otherwise, continuously vacuumizing until the conditions are met; the first calibration value is between 0.4 and 0.6mbar, the second calibration value is higher than the first calibration value and is between 0.8 and 1.2mbar, and the preset time period is between 30 and 60 min. For example, the first calibration value may be 0.4mbar, 0.45mbar, 0.50mbar, 0.55mbar, 0.6mbar, and the second calibration value may be 0.8mbar, 0.85mbar, 0.9mbar, 0.95mbar, 1.0mbar, 1.05mbar, 1.1mbar, 1.15mbar, 1.2 mbar.
S4, injecting pure and dry nitrogen into the GIS gas chamber with excessive micro-water until the pressure of the nitrogen reaches a third calibration value; wherein the third calibration value is between 0.1 and 0.3 MPa.
And S5, heating the outer wall of the aluminum cylinder of the micro-water content exceeding GIS gas chamber, controlling the temperature at 50-80 ℃, and continuing for a period of time to evaporate water remained in the parts in the micro-water content exceeding GIS gas chamber into nitrogen.
S6, detecting the micro water content in the nitrogen, releasing the nitrogen if the micro water content does not reach a preset value, and returning to the step S3; if the micro water content reaches the preset value, the process proceeds to step S7.
And S7, releasing nitrogen, vacuumizing, filling the GIS gas chamber with excessive micro water into SF6 gas which is qualified in the test until the rated pressure is reached, and supplementing the SF6 gas pressure of the adjacent gas chamber to the rated pressure.
The working principle of the technical scheme is as follows:
before the GIS air chamber with excessive micro-water content is vacuumized, the pressure reduction treatment is firstly carried out on the air chamber adjacent to the GIS air chamber, so that the phenomenon that the basin-type insulator and other parts of the adjacent air chamber are damaged due to the tensile fracture caused by negative pressure formed by vacuumization in the vacuumizing process to cause larger accidents is prevented; meanwhile, the outer wall of an aluminum cylinder of the GIS air chamber with excessive micro-water content is heated, the temperature of 50-80 ℃ is kept, the temperature cannot cause damage to the paint surface of the tank body of the air chamber, an internal current transformer and a sealing piece, the inner wall of the air chamber, parts and insulating materials are heated by utilizing the heat transfer principle, so that the internal water content is evaporated into steam, the steam is discharged by utilizing nitrogen replacement and vacuumizing modes, and the content of the internal water content is judged by detecting the micro-water content of the nitrogen until the water reaches the standard; secondly, the treatment method can be implemented by using the own SF6 gas recovery device and the purchased heating device of each station and factory without purchasing too much equipment.
In another embodiment, in step S6, after the micro water content of the nitrogen gas is measured, if the micro water content does not reach a preset value, one or more of the number of subsequent nitrogen gas replacements, the heating time or the number and time of vacuuming are determined according to the micro water content. Through the setting, subsequent relevant process parameters are determined according to the measured micro-water content, so that the full evaporation of water in the air chamber can be effectively ensured, and hidden dangers are avoided.
In another embodiment, heating the outer wall of the aluminum cylinder specifically includes: but aluminium section of thick bamboo outer wall adopts the liquefied gas tank heating band of automatically regulated temperature to heat an aluminium section of thick bamboo, the outside parcel of liquefied gas tank heating band has the thermal-insulated cotton of one deck, through the aluminium jar of little water exceeds standard GIS air chamber is heated and makes the inside spare part temperature of air chamber rise. Through setting up liquefied gas storage tank heating band, the coverage area is wide, and the inside spare part of air chamber is heated evenly, and the temperature controllability is good, and the outside covers the thermal-insulated cotton of one deck simultaneously, also more does benefit to the invariant that keeps the temperature, reduces the heat and runs off.
In a further embodiment, the first calibration value is between 0.45 ± 0.05mbar and the second calibration value is between 0.85 ± 0.05 mbar.
In a further embodiment, the preset time period is 45 ± 5 min.
In further embodiments, the third calibration value is between 0.2 ± 0.05 MPa.
In a further embodiment, in step S5, the heating controls the temperature to be 60-70 ℃.
In another embodiment, in step S7, the vacuuming may be stopped when the static vacuum degree reaches below the fourth calibrated value, the static vacuum degree is maintained for more than 30-60min, and the fifth calibrated value should not be exceeded in the repeated measurement, otherwise, the vacuuming is continued until the condition is met; wherein, the fourth calibration value of the static vacuum degree is between 0.4 and 0.6mbar (such as 0.45mbar, 0.50mbar and 0.55mbar), the fifth calibration value is higher than the fourth calibration value, and the fifth calibration value is between 0.5 and 0.7mbar (such as 0.55mbar, 0.60mbar and 0.65 mbar). Through the arrangement, nitrogen, residual air and the like in the GIS air chamber with excessive micro water content are fully sucked out, and the purity of the subsequently entering SF6 gas is ensured.
In a further embodiment, the method further comprises step S8: standing the GIS air chamber with the excessive micro water for a period of time, measuring the micro water content of the GIS air chamber, if the micro water content reaches the standard, successfully processing, and otherwise returning to the step S3; wherein the standing time is more than 24 hours. The stability of the micro water treatment is improved by setting the step S8.
In a further embodiment, in step S5, the period of time at the first time is 8-12h, and the duration of each subsequent time is not increased. The moisture that contains in the inside spare part of air chamber reduces gradually, and the time that needs heating of next time can not be more than the previous time, when using sparingly.
For example, when the micro-water content is obviously too high, the times of nitrogen gas to be replaced are more, the heating time is kept or slightly reduced, the vacuum degree of vacuumizing is larger, the water in the gas chamber can be fully evaporated, and the nitrogen gas can fully bring out the evaporated water, so that hidden dangers are avoided; when the micro-water content is obviously reduced, the replacement frequency of nitrogen is less, the heating time is obviously reduced, and the vacuum degree of vacuumizing is lower, so that the treatment process can be shortened, and the quick standard reaching is realized on the premise of not leaving hidden troubles.
The present invention will be described in detail below by way of an example.
As shown in FIG. 2, micro-water overproof treatment is carried out on a main transformer high-voltage side 201 QFI mother side isolation disconnecting link 2012QS air chamber of a valley power station No. 1 through the method.
1. Recovering SF6 gas in a GIS isolation switch gas chamber by using an SF6 gas recovery device (or a processing trolley) and vacuumizing, wherein the vacuum degree is below 0.5mbar (1bar is 0.1MPa), and the retest is not more than 0.8-0.9mbar after keeping for 3 min;
2. withdrawing the related secondary alarm loop, carrying out half-pressure reduction treatment on SF6 gas pressure of the adjacent gas chamber (preventing greater accidents caused by pulling and cracking a basin-type insulator of the adjacent gas chamber due to negative pressure in the process of vacuumizing), vacuumizing the GIS gas chamber with excessive micro water content, stopping when the vacuum degree reaches below 0.5mbar, keeping the vacuum degree for 3min, then retesting to be not more than 0.8-0.9mbar, and otherwise, continuing vacuumizing;
3. injecting pure and dry nitrogen into a GIS gas chamber with excessive micro-water content, and filling the nitrogen to 0.2MPa of rated pressure of the gas chamber;
4. on the outer wall of an aluminum cylinder of a micro water overproof GIS air chamber, a liquefied gas tank heating belt capable of automatically adjusting the temperature is adopted to heat the aluminum cylinder for 8-12 hours, the temperature is controlled at 60-70 ℃, a layer of heat insulation cotton is wrapped outside a heat tracing belt, the temperature of the inner wall of the air chamber, parts, insulating materials, coils and the like reaches about 60 ℃ through heating of the air chamber aluminum cylinder, so that water remained in the air chamber is evaporated in nitrogen, and dry nitrogen is used for replacing water vapor;
5. detecting the micro-water content in the nitrogen, determining the times of nitrogen replacement, heating time and vacuumizing time according to the micro-water content, recovering the nitrogen in the gas chamber, and vacuumizing the gas chamber again;
6. filling the air chambers with SF6 gas qualified in the test, slowly filling the air chambers to rated pressure, and then supplementing the pressure of the adjacent air chambers to the rated pressure;
7. and (4) standing the gas chambers filled with the SF6 gas for 24 hours, measuring SF6 micro-water values of the gas chambers, detecting to reach the standard, and finishing the treatment. The micro-water content of G04-4 obtained by the conventional treatment method is 80-90 mu L/L, and the micro-water treatment results obtained by the method of the invention are shown in the following table 1:
TABLE 1 treatment results of excessive micro-water
| Serial number | Device name | Voltage class (kV) | Air humidity (mu L/L) |
| 1 | G04-4 | 220 | 32 |
| 2 | G08-4 | 220 | 28 |
| 3 | G09-4 | 220 | 25 |
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A micro-water overproof treatment method for a 220KV GIS air chamber is characterized by comprising the following steps:
s1, recovering SF6 gas in the GIS gas chamber with excessive micro-water content;
s2, carrying out pressure reduction treatment on the gas chamber adjacent to the GIS gas chamber with excessive micro-water content, wherein the pressure after pressure reduction is 0.4-0.6 times of the rated pressure;
s3, vacuumizing the GIS air chamber with excessive micro water content, stopping when the vacuum degree is below a first calibration value, keeping the preset time length, and not exceeding a second calibration value in repeated time measurement, otherwise, continuously vacuumizing until the conditions are met; wherein the first calibration value is between 0.4 and 0.6mbar, the second calibration value is higher than the first calibration value and is between 0.8 and 1.2mbar, and the preset time period is between 30 and 60 min;
s4, injecting pure and dry nitrogen into the GIS gas chamber with excessive micro-water until the pressure of the nitrogen reaches a third calibration value; wherein the third calibration value is between 0.1 and 0.3 MPa;
s5, heating the outer wall of the aluminum cylinder of the micro-water content exceeding GIS air chamber, controlling the temperature at 50-80 ℃, and continuing for a period of time to evaporate water remained in the parts in the micro-water content exceeding GIS air chamber into nitrogen;
s6, detecting the micro water content in the nitrogen, releasing the nitrogen if the micro water content does not reach a preset value, and returning to the step S3; if the micro water content reaches the preset value, the step S7 is carried out;
and S7, releasing nitrogen, vacuumizing, filling the GIS gas chamber with excessive micro water into SF6 gas which is qualified in the test until the rated pressure is reached, and supplementing the SF6 gas pressure of the adjacent gas chamber to the rated pressure.
2. The method as claimed in claim 1, wherein in step S6, after the micro water content of the nitrogen gas is measured, if the micro water content does not reach a preset value, one or more of the number of subsequent nitrogen gas replacements, heating time or number and time of vacuuming are determined according to the micro water content.
3. The method for treating excessive micro-water for the 220KV GIS air chamber according to claim 1, wherein the step of heating the outer wall of the aluminum cylinder specifically comprises the following steps:
but aluminium section of thick bamboo outer wall adopts the liquefied gas tank heating band of automatically regulated temperature to heat an aluminium section of thick bamboo, the outside parcel of liquefied gas tank heating band has the thermal-insulated cotton of one deck, through the aluminium jar of little water exceeds standard GIS air chamber is heated and makes the inside spare part temperature of air chamber rise.
4. The method for treating the excessive micro-water in the 220KV GIS air chamber according to claim 1, wherein the first calibration value is between 0.45 +/-0.05 mbar, and the second calibration value is between 0.85 +/-0.05 mbar.
5. The method for treating the excessive water content of the 220kV GIS gas chamber according to claim 1, wherein the preset time is 45 +/-5 min.
6. The method for treating the excessive micro-water in the 220KV GIS air chamber according to claim 1, wherein the third calibration value is within 0.2 +/-0.05 MPa.
7. The method for excessive moisture treatment of a 220kv GIS gas cell as claimed in claim 1, wherein the heating controls the temperature at 60-70 ℃ in step S5.
8. The method for treating the excessive micro-water in the 220KV GIS air chamber according to claim 1, wherein in step S7, the vacuumizing is stopped when the static vacuum degree is below a fourth calibration value, the vacuumizing is kept for more than 30-60min, and the fifth calibration value is not exceeded in repeated measurement, otherwise, the vacuumizing is continued until the conditions are met; and the fourth calibration value of the static vacuum degree is between 0.4 and 0.6mbar, the fifth calibration value is higher than the fourth calibration value, and the fifth calibration value is between 0.5 and 0.7 mbar.
9. The method for treating the excessive micro-water content of the 220KV GIS air chamber according to claim 1, further comprising the step S8 of: standing the GIS air chamber with the excessive micro water for a period of time, measuring the micro water content of the GIS air chamber, if the micro water content reaches the standard, successfully processing, and otherwise returning to the step S3; wherein the standing time is more than 24 hours.
10. The method for excessive moisture treatment of a 220KV GIS gas chamber as claimed in claim 1, wherein in step S5, the period of time in the initial period is 8-12h, and the duration of each subsequent period is not increased.
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