CN114006296A - Dehumidification method and dehumidification mechanism applied to SF6 insulated high-voltage electrical appliance - Google Patents
Dehumidification method and dehumidification mechanism applied to SF6 insulated high-voltage electrical appliance Download PDFInfo
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- CN114006296A CN114006296A CN202111284375.1A CN202111284375A CN114006296A CN 114006296 A CN114006296 A CN 114006296A CN 202111284375 A CN202111284375 A CN 202111284375A CN 114006296 A CN114006296 A CN 114006296A
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
- Drying Of Gases (AREA)
Abstract
本发明属于高压输配电领域，公开了一种应用于SF6绝缘高压电器的降湿方法，不仅操作简单、大大提高了降湿效率，而且也杜绝了因操作高压开关设备而导致的以外电路问题，首先，对降湿容器进行抽气形成欠压降湿容器，然后，将干燥SF6气源与欠压降湿容器连通形成增压降湿容器，最后，判断增压降湿容器的气压是否大于等于绝缘高压电器内的气压，若大于，则断开增压降湿容器与干燥SF6气源，并将增压降湿容器与绝缘高压电器连通。本发明还公开了一种用于实施上述降湿方法的应用于SF6绝缘高压电器的降湿机构。The invention belongs to the field of high-voltage power transmission and distribution, and discloses a dehumidification method applied to SF6 insulated high-voltage electrical appliances. , First, the dehumidification container is pumped to form an underpressure dehumidification container, then the dry SF6 gas source is connected to the underpressure dehumidification container to form a pressurized dehumidification container, and finally, it is judged whether the air pressure of the pressurized dehumidification container is greater than It is equal to the air pressure in the insulated high-voltage electrical appliance. If it is greater than that, disconnect the pressurized and dehumidified container from the dry SF6 gas source, and connect the pressurized and dehumidified container with the insulated high-voltage electrical appliance. The invention also discloses a dehumidification mechanism applied to SF6 insulated high-voltage electrical appliances for implementing the above dehumidification method.
Description
Technical Field
The invention belongs to the field of high-voltage power transmission and distribution, and particularly relates to a dehumidification method and a dehumidification mechanism applied to an SF6 insulated high-voltage electrical appliance.
Background
Due to the excellent insulating property and arc extinguishing property of the SF6 gas, an insulating high-voltage electrical appliance taking the SF6 gas as an insulating medium is more and more widely applied to a power grid, and SF6 insulating high-voltage electrical appliance equipment has the advantages of high operation reliability, small maintenance workload and the like.
During the power-on operation of the insulated high-voltage electrical apparatus, the micro-water content (i.e. moisture, the same applies hereinafter) of SF6 in the insulated high-voltage electrical apparatus has an important influence on the reliable operation of the high-voltage electrical apparatus, specifically, SF6 gas and moisture can generate strong corrosive acidic substances under the action of an electric arc, the strong acidic substances can corrode metal parts and insulators, and the corroded parts can easily cause serious equipment accidents.
At present, when the micro water amount of SF6 high-voltage electrical equipment in operation is detected to exceed the standard, firstly, the insulation high-voltage electrical equipment is vacuumized after power failure and then is subjected to ventilation treatment to reduce humidity, but the power failure maintenance of the high-voltage switch equipment for controlling the on-off of a circuit is complex, the power failure at any time cannot be achieved, and the power failure operation can also bring unexpected circuit safety problems to the real power grid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the dehumidification method and the dehumidification mechanism applied to the SF6 insulated high-voltage electrical appliance, and the dehumidification method and the dehumidification mechanism are used in a matched manner, so that the uninterrupted dehumidification mode of the insulated high-voltage electrical appliance can be realized, the operation is simple, the dehumidification efficiency is greatly improved, and the safety problem of external circuits caused by the operation of high-voltage switch equipment is also avoided.
In order to achieve the purpose, the invention provides the following technical scheme:
a dehumidification method applied to an SF6 insulated high-voltage apparatus is used for dehumidifying SF6 with first preset air pressure in the insulated high-voltage apparatus, the insulated high-voltage apparatus enables the temperature of the insulated high-voltage apparatus to be larger than the ambient temperature through obtaining electricity, and the dehumidification method is characterized by comprising the following steps:
step S1: setting a humidity reducing container with the temperature equal to the ambient temperature, and exhausting air from the humidity reducing container to form an under-pressure humidity reducing container with a second preset air pressure;
step S2: providing a source of dry SF6 having a third predetermined pressure, the first predetermined pressure and the second predetermined pressure each being less than the third predetermined pressure;
step S3: communicating the under-pressure humidity reducing container with a dry SF6 air source, so that SF6 flows to enable the second pre-air pressure to be increased to a fourth preset air pressure, and taking the under-pressure humidity reducing container as a pressurizing humidity reducing container;
step S4: and when the fourth preset air pressure is greater than or equal to the first preset air pressure, isolating the pressurization and dehumidification container from the air source of the dry SF6, and communicating the pressurization and dehumidification container with the insulated high-voltage electric appliance, so that SF6 flows, and then, the SF6 in the insulated high-voltage electric appliance is dehumidified.
Preferably, the temperature of the insulated high-voltage electrical apparatus is 10-15 ℃ higher than the ambient temperature.
Preferably, the second predetermined air pressure is equal to or less than 10 Pa.
Preferably, the under-pressure dehumidification container is communicated with a dry SF6 air source by maintaining the second preset air pressure for 24 h.
A dehumidifying mechanism applied to an SF6 insulated high-voltage electrical apparatus for implementing the dehumidifying method applied to the SF6 insulated high-voltage electrical apparatus, comprising: the humidity reducing container is the humidity reducing container; the vacuum pump is connected with the dehumidification container through a first on-off control valve and is used for pumping air to the dehumidification container; the air source container is the dry SF6 air source and is connected with the dehumidification container through a second on-off control valve; the first pressure gauge is used for measuring and reading the fourth preset air pressure; and the second pressure gauge is used for measuring and reading the first preset air pressure.
Preferably, the dehumidification container is detachably connected with the insulated high-voltage apparatus through a heat-resistant pipe, the vacuum pump is detachably connected with the dehumidification container through a pipeline, and the air source container is detachably connected with the dehumidification container through a pipeline.
Further, the heat conductivity coefficient of the heat-resistant pipe is less than 0.2.
Preferably, the invention further comprises a micro-water detection module for measuring the micro-water amount of SF6 in the insulated high-voltage electrical appliance in real time.
Compared with the prior art, the invention has the beneficial effects that:
1. because the dehumidifying method applied to the SF6 insulating high-voltage apparatus of the invention firstly carries out air extraction on the dehumidifying container to form an under-voltage dehumidifying container, then a dry SF6 air source is communicated with the under-voltage dehumidifying container to form a pressurizing dehumidifying container, and finally whether the air pressure of the pressurizing dehumidifying container is larger than the air pressure in the insulating high-voltage apparatus is judged, if the air pressure is larger than or equal to the air pressure in the insulating high-voltage apparatus, the pressurizing dehumidifying container is disconnected from the dry SF6 air source, and the pressurizing dehumidifying container is communicated with the insulating high-voltage apparatus, because the insulating high-voltage apparatus is in an electric operation state, the temperature rises under the heat effect of current, the temperature of the SF6 in the inside is raised, and the temperature of the dehumidifying container is always equal to the environmental temperature, so that the SF6 flows between the pressurizing dehumidifying container with the insulating high-voltage apparatus with a temperature difference, namely the dry SF6 enters the insulating high-voltage apparatus to be mixed and averaged with the SF6 with a micro water content exceeding, thereby realizing the dehumidifying of the SF6 in the insulating high-voltage apparatus, therefore, the invention not only has simple operation and greatly improves the dehumidification efficiency, but also avoids the problem of external circuits caused by operating the high-voltage switch equipment.
2. Because the under-pressure dehumidification container is communicated with the dry SF6 air source by maintaining the pressure of the second preset air pressure for 24 hours, the air tightness of the under-pressure dehumidification container is ensured to be good by maintaining the pressure.
3. Because the dehumidifying mechanism applied to the SF6 insulated high-voltage electrical apparatus comprises the dehumidifying container, the dehumidifying container is the dehumidifying container; the vacuum pump is connected with the dehumidification container through a first on-off control valve and is used for pumping air to the dehumidification container; the air source container is the dry SF6 air source and is connected with the dehumidification container through a second on-off control valve; the first pressure gauge is used for measuring and reading the fourth preset air pressure; and a second pressure gauge for measuring and reading the first predetermined air pressure, therefore, the dehumidification mechanism applied to the SF6 insulated high-voltage electric appliance comprises the dehumidification container, so that the dehumidification method applied to the SF6 insulated high-voltage electric appliance can be better implemented.
4. Because the dehumidifying container is detachably connected with the insulating high-voltage electrical appliance through the heat-resistant pipe, the vacuum pump is detachably connected with the dehumidifying container through a pipeline, and the air source container is detachably connected with the dehumidifying container through a pipeline, the dehumidifying mechanism applied to the SF6 insulating high-voltage electrical appliance is easy to carry and transport, convenient to install and easy to maintain.
5. Because the heat conductivity coefficient of the heat-resistant pipe is less than 0.2, the temperature difference between the dehumidification container and the insulated high-voltage electrical appliance can be ensured within a preset range within preset time, and the dehumidification effect of the insulated high-voltage electrical appliance is effectively realized.
Drawings
Fig. 1 is a schematic diagram of the steps of a dehumidification method applied to an SF6 insulated high-voltage electrical apparatus according to an embodiment of the invention;
fig. 2 is a schematic implementation diagram of a humidity reducing mechanism applied to an SF6 insulated high-voltage electrical apparatus according to an embodiment of the present invention.
In the figure: s100, a dehumidification method applied to an SF6 insulation high-voltage electric appliance, 100, a dehumidification mechanism applied to an SF6 insulation high-voltage electric appliance, A, an insulation high-voltage electric appliance, 1, a dehumidification container, 2, an air extraction pipeline, 3, a vacuum pump, 4, a first on-off control valve, 5, an air inflation pipeline, 6, an air source container, 7, a second on-off control valve, 8, a first pressure gauge, 9, a second pressure gauge, 10, a heat-resistant pipe, 11, a third on-off control valve, 12 and a micro-water detection module.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the present invention easy to understand, the following embodiments are specifically described in the following embodiments of the present invention with reference to the drawings, and the description of the embodiments is for assisting understanding of the present invention, but the present invention is not limited thereto.
As shown in fig. 1, a humidity reducing method S100 applied to an SF6 insulated high-voltage electrical apparatus in this embodiment is used for reducing humidity of SF6 at a first predetermined air pressure in the insulated high-voltage electrical apparatus, the insulated high-voltage electrical apparatus makes its own temperature greater than an ambient temperature by being powered on, the insulated high-voltage electrical apparatus can be regarded as a switch-on position on a high-voltage power grid, and is internally filled with SF6 as an insulating medium, during operation, current continuously passes through a solid part of the insulated high-voltage electrical apparatus, so that the insulated high-voltage electrical apparatus is heated to be higher than the ambient temperature, and the internal SF6 keeps the same as the solid temperature through heat conduction, specifically, the temperature of the insulated high-voltage electrical apparatus is 10 ℃ to 15 ℃ greater than the ambient temperature.
The dehumidification method S100 applied to the SF6 insulated high-voltage electric appliance comprises the following steps:
step S1: and setting a humidity reducing container with the temperature equal to the ambient temperature, and exhausting air from the humidity reducing container to form the under-pressure humidity reducing container with second preset air pressure.
Specifically, the second predetermined air pressure is 10Pa or less.
Step S2: a source of dry SF6 having a third predetermined air pressure is provided, the first predetermined air pressure and the second predetermined air pressure each being less than the third predetermined air pressure.
Specifically, the micro-moisture value of the dry SF6 gas source is far less than the micro-moisture standard value of SF6 in the insulated high-voltage electric appliance A, and the third preset air pressure ranges from 0.4 MPa to 0.6 MPa.
Step S3: and (3) communicating the under-pressure humidity reducing container with a dry SF6 air source, so that the SF6 flows to enable the second preset air pressure to be increased to a fourth preset air pressure, taking the under-pressure humidity reducing container at the moment as a pressure-increasing humidity reducing container, and once the third preset air pressure is greater than the second preset air pressure, enabling the under-pressure humidity reducing container and the SF6 in the dry SF6 air source to flow mutually to enable the second preset air pressure to be increased.
Specifically, the under-pressure dehumidification container is communicated with a dry SF6 air source through sealing and maintaining the pressure for 24 hours by using a second preset air pressure, so that the air tightness of the under-pressure dehumidification container is ensured to be good.
Step S4: and when the fourth preset air pressure is greater than or equal to the first preset air pressure, isolating the pressurization and dehumidification container from the air source of the dry SF6, and communicating the pressurization and dehumidification container with the insulated high-voltage electric appliance, so that SF6 flows, and then, the SF6 in the insulated high-voltage electric appliance is dehumidified.
Specifically, a fourth preset air pressure and a first preset air pressure are respectively read by a first pressure gauge and a second pressure gauge, the fourth preset air pressure is larger than or equal to the first preset air pressure, the temperature of SF6 in the insulating high-voltage electric appliance is 10-15 ℃ different from that of SF in the pressurization and dehumidification container, after the two are communicated, SF6 mutually flows in the insulating high-voltage electric appliance and the pressurization and dehumidification container under the influence of the pressure difference and the temperature difference, so that the SF6 in the insulating high-voltage electric appliance and the pressurization and dehumidification container are subjected to micro-water balance, and the dehumidification effect is further realized.
As shown in fig. 2, the dehumidifying mechanism 100 applied to the SF6 insulated high-voltage electrical appliance for implementing the dehumidifying method S100 applied to the SF6 insulated high-voltage electrical appliance of the embodiment includes a dehumidifying container 1, a vacuum pump 3, an air source container 6, a first pressure gauge 8, a second pressure gauge 9, and a micro-water detecting module 12.
The dehumidification container 1 is the dehumidification container and is detachably connected with the insulated high-voltage electrical apparatus a through the heat-resistant pipe 10, the heat-resistant pipe 10 is provided with a third on-off control valve 11 for controlling on-off of the dehumidification container 1 and the insulated high-voltage electrical apparatus a, specifically, the heat-resistant pipe 10 is a heat-resistant rubber pipeline, and the heat conductivity coefficient is less than 0.2.
The vacuum pump 3 is detachably connected with the dehumidification container 1 through the air exhaust pipeline 2, the vacuum pump 3 is used for exhausting air to the dehumidification container 1, and specifically, the air exhaust pipeline 2 is provided with a first on-off control valve 4 for controlling the on-off of the vacuum pump 3 and the dehumidification container 1.
The air source container 6 is the dry SF6 air source, the air source container 6 is detachably connected with the dehumidification container 1 through an air charging pipeline 5, and specifically, the air charging pipeline 5 is provided with a second on-off control valve 7 for controlling on-off of the air source container 6 and the dehumidification container 1.
The first pressure gauge 8 is arranged at the gas output end of the dehumidification container 1, and the first pressure gauge 8 is used for measuring and reading the fourth preset gas pressure.
The second pressure gauge 9 is arranged at the gas input end of the insulated high-voltage electrical appliance A and is used for measuring and reading the first preset gas pressure.
The micro-water detection module 12 is arranged at the gas input end of the insulated high-voltage electrical apparatus a and is used for measuring the micro-water amount of SF6 in the insulated high-voltage electrical apparatus in real time.
The operation of the dehumidifying mechanism 100 for SF6 insulated high-voltage electrical equipment is described in the following with reference to the embodiment:
a preparation stage: and (3) assembling the dehumidifying mechanism 100 applied to the SF6 insulating high-voltage electrical appliance on site, and connecting the dehumidifying mechanism 100 applied to the SF6 insulating high-voltage electrical appliance with the insulating high-voltage electrical appliance A after the first on-off control valve 4, the second on-off control valve 7 and the third on-off control valve 11 are all closed.
The implementation stage is as follows: firstly, opening a first on-off control valve 4, and pumping air to the dehumidification container 1 to 10Pa or below 10 Pa; then, after maintaining the pressure for 24 hours, closing the first on-off control valve 4, opening the second on-off control valve 7, and filling high-purity dry SF6 gas into the dehumidification container 1 through the gas source container 6, wherein the high-purity dry SF6 gas is the dry SF 6; and finally, when the pressure reading of the first pressure gauge 8 is greater than or equal to the pressure reading of the second pressure gauge 9, closing the second on-off control valve 7, opening the third on-off control valve 11, communicating the dehumidification container 1 with the insulation high-voltage electric appliance A, and dehumidifying the insulation high-voltage electric appliance A.
The above-described embodiments are preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and changes can be made by those skilled in the art without inventive work within the scope of the appended claims.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111284375.1A CN114006296B (en) | 2021-11-01 | 2021-11-01 | Dehumidification method and dehumidification mechanism applied to SF6 insulation high-voltage electrical apparatus |
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| CN202111284375.1A CN114006296B (en) | 2021-11-01 | 2021-11-01 | Dehumidification method and dehumidification mechanism applied to SF6 insulation high-voltage electrical apparatus |
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| CN114006296A true CN114006296A (en) | 2022-02-01 |
| CN114006296B CN114006296B (en) | 2023-11-17 |
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|---|---|---|---|---|
| US6155313A (en) * | 1998-03-06 | 2000-12-05 | Beverly Smalley | Tire evacuation and inflation apparatus and method |
| CN2831394Y (en) * | 2005-06-06 | 2006-10-25 | 常州市人本电气有限公司 | Vacuum aerating device of SF high voltage circuit breaker |
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| CN113358343A (en) * | 2021-06-29 | 2021-09-07 | 湖南长高电气有限公司 | Preparation method and device of gas capable of replacing sulfur hexafluoride to carry out running-in test |
| CN216214912U (en) * | 2021-11-01 | 2022-04-05 | 上海思源高压开关有限公司 | Extensible dehumidifying mechanism of insulated high-voltage electrical appliance |
-
2021
- 2021-11-01 CN CN202111284375.1A patent/CN114006296B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155313A (en) * | 1998-03-06 | 2000-12-05 | Beverly Smalley | Tire evacuation and inflation apparatus and method |
| CN2831394Y (en) * | 2005-06-06 | 2006-10-25 | 常州市人本电气有限公司 | Vacuum aerating device of SF high voltage circuit breaker |
| CN209447030U (en) * | 2019-02-26 | 2019-09-27 | 国家电网有限公司 | Do not have a power failure the network monitoring system for things of type of respiration sulfur hexafluoride purifying processing device |
| CN113358343A (en) * | 2021-06-29 | 2021-09-07 | 湖南长高电气有限公司 | Preparation method and device of gas capable of replacing sulfur hexafluoride to carry out running-in test |
| CN216214912U (en) * | 2021-11-01 | 2022-04-05 | 上海思源高压开关有限公司 | Extensible dehumidifying mechanism of insulated high-voltage electrical appliance |
Non-Patent Citations (1)
| Title |
|---|
| 蔡萱等: ""GIS中SF6绝缘气体在线除湿技术及应用研究"", 《电网运维》, pages 37 - 39 * |
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