CN110556729A - Electric moisture-proof method for switch cabinet - Google Patents
Electric moisture-proof method for switch cabinet Download PDFInfo
- Publication number
- CN110556729A CN110556729A CN201910926003.0A CN201910926003A CN110556729A CN 110556729 A CN110556729 A CN 110556729A CN 201910926003 A CN201910926003 A CN 201910926003A CN 110556729 A CN110556729 A CN 110556729A
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- China
- Prior art keywords
- cabinet
- switch cabinet
- air pressure
- air
- switchgear
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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
- 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
-
- 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
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Patch Boards (AREA)
Abstract
The invention discloses an electric moisture-proof method for a switch cabinet, which comprises the following steps: s1: the temperature, humidity and air pressure equivalence in the switch cabinet are obtained and uploaded to the control unit; s2: comparing the obtained value with an air pressure value of the environment outside the switch cabinet; s3: judging whether the ratio of the air pressure value in the switch cabinet to the ambient air pressure is in a set range or not; s4: if the temperature is lower than the set range, the power main machine acts to convey dry air into the switch cabinet; s5: if the power main machine is located in the set range, the power main machine stops operating. Utilize the pressure-fired system to send into the cabinet through connecting each regulator cubicle pipeline clean dry air from each cubical switchboard bottom in, the pressure-fired system can supply sufficient dry clean air for corresponding cabinet body automatically according to the pressure sensor feedback value of every cabinet body bottom, is maintaining the gaseous pressure-fired state that is higher than the outer gaseous of cabinet in the cabinet all the time to reach dampproofing purpose, guarantee the long-term stable work of electrical equipment and components and parts in the cabinet.
Description
Technical Field
The invention relates to the technical field of moisture prevention of electrical equipment, in particular to an electrical moisture prevention method for a switch cabinet.
Background
The switch cabinet is an electric device, the external line of the switch cabinet firstly enters a main control switch in the cabinet and then enters a branch control switch, and each branch circuit is arranged according to the requirement. Such as meters, automatic controls, magnetic switches of motors, various alternating current contactors, and the like, some of which are also provided with high-voltage chambers and low-voltage chamber switch cabinets, and high-voltage buses, such as power plants, and some of which are also provided with low-frequency load shedding for keeping main equipment. The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of power generation, power transmission, power distribution and electric energy conversion of an electric power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. The classification methods of the switch cabinets are various, for example, the switch cabinets can be divided into movable switch cabinets and fixed switch cabinets by the installation mode of the circuit breaker; or according to different cabinet body structures, the cabinet body can be divided into an open type switch cabinet, a metal closed switch cabinet and a metal closed armored switch cabinet; the high-voltage switch cabinet, the medium-voltage switch cabinet, the low-voltage switch cabinet and the like can be divided according to different voltage grades. The method is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textile, industrial and mining enterprises, residential districts, high-rise buildings and the like.
due to the fact that underground soil is high in water content, water seepage of a cable channel in the switching station is serious, the surface of the lower portion of the inner wall of the switching station swells and loosens, high-density water vapor is formed in the inner space of the switching station, the humidity in the switching station reaches 80% -90%, condensation of the inner wall of the cabinet body is serious after the indoor switch cabinet runs for a long time, even alkaline white substances are formed and adsorbed to the inner wall of the cabinet and a cable inlet, and damage to electrical equipment is serious. The operation and maintenance personnel adopt measures such as pumping water and accessing a high-power central air conditioner to reduce the indoor air humidity to the greatest extent, but the effect is little, and the current situation of the problem cannot be thoroughly changed.
For the above problems, the common solutions in the industry at present are:
1. The drying agent of a certain amount is placed in the regulator cubicle and is used for absorbing the steam in the air, and this kind of mode can have certain dehumidification effect, but receives the effect a little, and to the great condition of indoor steam concentration, the drying agent loses drying effect because of absorbing more steam after a long time.
2. In the switching station and the distribution room, a high-power precision air conditioner or a central air conditioner is disposed. This method cannot completely remove moisture in the interior of an opening and closing station or the like, and is expensive and poor in the improvement effect after use. Especially, the water vapor state in the electrical cabinet is not really improved, because water vapor mainly enters the cabinet from the bottom cable channel, the precise air conditioner cannot ensure that the interior of the electrical cabinet is dry.
3. adopt the design that improves the whole protection level of cubical switchboard, improve it and prevent that foreign object from getting into cabinet body inside, but can't prevent in steam gets into the cabinet from the cable bottom gap of inlet wire.
the utility model relates to an intelligent dampproofing cubical switchboard of application number 201720422384.5, including the cubical switchboard body, cubical switchboard body top is equipped with dash board, the cubical switchboard body includes electrical apparatus instrument room, generating line room and dehumidification room, be equipped with the filter screen between electrical apparatus instrument room and the generating line room, electrical apparatus instrument room top is equipped with the air intake, the air intake bottom is equipped with the suction fan, be equipped with the baffle between generating line room and the dehumidification room, be equipped with the thermometer on the baffle, hygronom and air inlet, be equipped with the PLC controller in the dehumidification room, the evaporimeter, air compressor, condenser and water collector, be equipped with the expansion valve on the pipeline between evaporimeter and the water collector, be equipped with the temperature sensing package on the expansion valve, be equipped with the drain pipe on the water collector, be equipped with the solenoid valve on the drain; the utility model discloses can monitor humidity in the cabinet, intelligence dehumidification improves cubical switchboard operating stability and security. However, the temperature and humidity are monitored by a temperature instrument, when the temperature and humidity exceed a certain value, the temperature and humidity are controlled by a PLC (programmable logic controller), an evaporator, an air compressor, a condenser, a water collector and the like, and how to control the working process of the main machine through parameters in the switch cabinet is not mentioned.
Disclosure of Invention
in order to overcome the defects of the prior art, the invention aims to provide an electrical moisture-proof method for a switch cabinet, so as to provide a low-temperature and dry environment for the electrical cabinet and ensure long-term stable operation of electrical appliances and devices in the cabinet.
therefore, the invention provides an electric moisture-proof method for a switch cabinet, which comprises the following steps:
S1: the temperature, humidity and air pressure equivalence in the switch cabinet are obtained through a sensor and are uploaded to a control unit;
S2: comparing the obtained value with an air pressure value of the environment outside the switch cabinet;
s3: judging whether the ratio of the air pressure value in the switch cabinet to the ambient air pressure is in a set range or not;
S4: if the ratio of the air pressure value in the switch cabinet to the ambient air pressure is lower than the set range, the power main machine acts to convey dry air into the switch cabinet;
S5: and if the ratio of the air pressure value in the switch cabinet to the ambient air pressure is within a set range, the power main machine stops acting.
Further, the sensor in the switch cabinet comprises a temperature and humidity sensor for monitoring temperature and humidity.
Further, the sensors in the switchgear cabinet comprise pressure sensors for the gas pressure in the switchgear cabinet.
furthermore, the mode of uploading the temperature, humidity and air pressure data acquired by the sensor to the control unit is a wireless communication protocol.
Further, the normal range of the ratio of the air pressure value in the switch cabinet to the ambient air pressure is 103% -105%.
Further, the sensor is in a working state when the power main machine is in a working state or a non-working state.
Further, the power main engine is a fan and is used for conveying dry air.
furthermore, the outlet of the fan is provided with a multi-layer filtering device for filtering impurities in the air.
Furthermore, a magnetic valve is arranged on the switch cabinet door and used for conveying the dried and filtered air into the switch cabinet in a pressurized mode.
Compared with the prior art, the invention has the beneficial effects that:
the utility model provides a pair of cubical switchboard electric damp-proofing method can effectively adjust low temperature and dry environment in the regulator cubicle, and electric apparatus and device stable work for a long time in the guarantee cabinet, a host computer can supply with dry air for a plurality of electrical equipment simultaneously, carries out the environmental condition control of a plurality of equipment simultaneously, and the interior air pressure of automatically regulated cabinet is convenient for manage for a long time, also the specially adapted adverse circumstances.
in addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method of electrically and moisture proofing a switchgear of the present invention; and
fig. 2 is a schematic structural diagram of the switch cabinet of the present invention.
Detailed Description
it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1-2 illustrate some embodiments according to the invention.
A method of electrically moisture-proofing a switchgear, comprising the steps of:
S1: acquiring equivalent values of temperature, humidity and air pressure in the switch cabinet, and uploading the equivalent values to a control unit;
S101: uploading the temperature and humidity value in the switch cabinet to a control unit through a communication protocol;
s102: and uploading the air pressure value in the switch cabinet to the control unit through a communication protocol.
The communication between each acquisition unit and the host adopts CAN communication because the host is arranged close to the acquisition point.
the communication between the host and the monitoring platform can adopt 4G network wireless communication or wired communication by means of a signal channel of a power communication network according to the actual environment on site. According to the standard specification requirement of the power industry, the field data acquired by the system cannot be accessed to the power intranet monitoring platform, so that the data transmitted by the system can only be transmitted to a monitoring room through an extranet (Internet).
S2: comparing the value obtained at S1 with the air pressure value of the environment outside the switch cabinet;
S3: if the air pressure value in the switch cabinet is 103% -105% of the ambient air pressure, the power main machine does not act, and the temperature, the humidity and the air pressure value of the switch cabinet are continuously monitored;
s4: if the air pressure value in the switch cabinet is lower than 103% -105% of the ambient air pressure, the power main machine acts, dries the air, performs multi-layer filtration, conveys the air into the switch cabinet in a pressurized manner, and continuously monitors the temperature, humidity and air pressure value in the switch cabinet;
S401: judging that the air pressure value in the switch cabinet is lower than 103% -105% of the ambient air pressure;
S402: the power main machine can be used for turning on the fan;
S403: drying air by a fan, and filtering in multiple layers;
S404: and opening a magnetic valve of the switch cabinet door, and pressurizing and conveying the dried and filtered air into the switch cabinet.
s5: if the air pressure value in the switch cabinet is 103% -105% of the ambient air pressure, the power main machine stops operating, and the temperature, the humidity and the air pressure value of the switch cabinet are continuously monitored.
The working principle of the electric moisture-proof method of the switch cabinet is as follows:
in the process of providing dry and clean air for the switch cabinet, data such as temperature, humidity and gas pressure in the cabinet need to be continuously acquired, and feedback control is carried out through a control unit of the data and an external air power device, so that the air pressure in the switch cabinet is always slightly higher than the air pressure outside the cabinet (such as 3% -5%), namely the cabinet is in a micro-positive pressure state, and thus air with higher humidity outside the cabinet can be prevented from flowing backwards into the cabinet body. The entire moisture barrier system is similar to a scaled down version of a central air conditioner providing dry clean air to the individual cabinets.
The electrical cabinet in the switching station is affected with damp, and the essence of the method is that the working environment of devices/equipment in the switch cabinet needs to be adjusted, and the state of high humidity in air in the cabinet is adjusted to the operation environment with reasonable humidity (for example, the air humidity is dynamically controlled to be between 40% and 60%) so as to ensure the normal work of the electrical devices in the switch cabinet. The operation environment outside the switch cabinet is relevant to the operation of the whole electrical equipment, but is not a main factor influencing the electrical operation environment in the cabinet, and the cabinet body is arranged between the inside and the outside of the cabinet for isolation and protection, so that the air in the cabinet is ensured to be dry. Based on the analysis, can borrow the technical thinking of generator enclosed bus pressure-fired protection, consider to adopt effective measure to the reasonable sealed shutoff of cubical switchboard inlet wire, reserve certain disappointing passageway, then adopt external power to continuously provide dry air for in the cubical switchboard, guarantee that the cubical switchboard is inside to be in good operational environment to guarantee the cubical switchboard reliable operation for a long time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An electrical moisture-proof method for a switch cabinet is characterized by comprising the following steps:
S1: the temperature, humidity and air pressure equivalence in the switch cabinet are obtained through a sensor and are uploaded to a control unit;
S2: comparing the obtained value with an air pressure value of the environment outside the switch cabinet;
s3: judging whether the ratio of the air pressure value in the switch cabinet to the ambient air pressure is in a set range or not;
S4: if the ratio of the air pressure value in the switch cabinet to the ambient air pressure is lower than the set range, the power main machine acts to convey dry air into the switch cabinet;
S5: and if the ratio of the air pressure value in the switch cabinet to the ambient air pressure is within a set range, the power main machine stops acting.
2. The method of claim 1, wherein the sensors within the switchgear comprise temperature and humidity sensors for monitoring temperature and humidity.
3. Method for electrical and moisture protection of a switchgear cabinet according to claim 1, characterized in that the sensors in the switchgear cabinet comprise pressure sensors for the gas pressure in the switchgear cabinet.
4. The method for preventing electric moisture of switch cabinet according to claim 1, wherein the mode of uploading the temperature, humidity and air pressure data acquired by the sensor to the control unit is a wireless communication protocol.
5. A method of electrically and moisture-proof a switchgear cabinet as claimed in claim 1, characterized in that the ratio of the air pressure value in the switchgear cabinet to the ambient air pressure is normally in the range of 103% to 105%.
6. An electrical moisture protection method for a switchgear cabinet according to claim 1, wherein said sensor is in operation during operation or during shutdown of the power main unit.
7. the method of claim 1, wherein the power master is a fan for delivering dry air.
8. The method of claim 7, wherein the outlet of the blower is provided with a multi-layer filter device for filtering impurities in the air.
9. the method of claim 8, wherein a magnetic valve is disposed on the door of the switchgear for pressurized delivery of the dried and filtered air into the switchgear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926003.0A CN110556729A (en) | 2019-09-27 | 2019-09-27 | Electric moisture-proof method for switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926003.0A CN110556729A (en) | 2019-09-27 | 2019-09-27 | Electric moisture-proof method for switch cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN110556729A true CN110556729A (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910926003.0A Pending CN110556729A (en) | 2019-09-27 | 2019-09-27 | Electric moisture-proof method for switch cabinet |
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| CN (1) | CN110556729A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112776645A (en) * | 2021-01-28 | 2021-05-11 | 江苏航运职业技术学院 | Dampproofing new energy automobile fills electric pile |
| CN114362072A (en) * | 2021-12-09 | 2022-04-15 | 贵州电网有限责任公司 | Dehumidification device and method for transformer substation terminal box in high corrosion area |
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| CN105406378A (en) * | 2015-12-31 | 2016-03-16 | 洛阳润奥供电有限公司 | High-voltage electric cabinet heat dissipation device |
| CN107045365A (en) * | 2017-04-05 | 2017-08-15 | 李振 | Hospital ward temperature and humidity intelligent is adjusted and outdoor environment monitoring system |
| CN108767669A (en) * | 2018-08-01 | 2018-11-06 | 广东电网有限责任公司 | A kind of Novel switch cabinet damp-proof device and system |
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2019
- 2019-09-27 CN CN201910926003.0A patent/CN110556729A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597949A (en) * | 2014-12-31 | 2015-05-06 | 重庆川仪自动化股份有限公司 | Collected cultural relic exhibition microenvironment regulation control system |
| CN105406378A (en) * | 2015-12-31 | 2016-03-16 | 洛阳润奥供电有限公司 | High-voltage electric cabinet heat dissipation device |
| CN107045365A (en) * | 2017-04-05 | 2017-08-15 | 李振 | Hospital ward temperature and humidity intelligent is adjusted and outdoor environment monitoring system |
| CN108767669A (en) * | 2018-08-01 | 2018-11-06 | 广东电网有限责任公司 | A kind of Novel switch cabinet damp-proof device and system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112776645A (en) * | 2021-01-28 | 2021-05-11 | 江苏航运职业技术学院 | Dampproofing new energy automobile fills electric pile |
| CN112776645B (en) * | 2021-01-28 | 2022-09-23 | 江苏航运职业技术学院 | Dampproofing new energy automobile fills electric pile |
| CN114362072A (en) * | 2021-12-09 | 2022-04-15 | 贵州电网有限责任公司 | Dehumidification device and method for transformer substation terminal box in high corrosion area |
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Application publication date: 20191210 |