CN101783482B - Intelligent temperature difference type condensation-preventing controller for switchgear - Google Patents
Intelligent temperature difference type condensation-preventing controller for switchgear Download PDFInfo
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- CN101783482B CN101783482B CN200910029037A CN200910029037A CN101783482B CN 101783482 B CN101783482 B CN 101783482B CN 200910029037 A CN200910029037 A CN 200910029037A CN 200910029037 A CN200910029037 A CN 200910029037A CN 101783482 B CN101783482 B CN 101783482B
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Abstract
The invention discloses an intelligent temperature difference type condensation-preventing controller for a switchgear, which comprises a first switchgear inside temperature acquisition circuit, a second switchgear inside temperature acquisition circuit, a switchgear outside temperature acquisition circuit, a switchgear inside humidity acquisition circuit, a microprocessor, an alarm and display circuit, a heating control circuit, an air exhaust control circuit, a 485 interface circuit and a power circuit. The intelligent temperature difference type condensation-preventing controller for the switchgear is mainly based on a condensation generating and preventing mechanism and does not adopt a traditional condensation sensor any more but adopts a method of adjusting temperature difference between the switchgear inside temperature and the switchgear outside temperature by using temperature sensors inside and outside the switchgear to allow the switchgear inside temperature to be 1 to 3 DEG C higher than the switchgear outside temperature all the time and allow the inside of the switchgear to have no condensation generating condition. Therefore, the controller has the function of preventing the inside of the switchgear from generating condensation. At the same time, a humidity sensor in the switchgear is adopted to measure and control the relative humidity in the switchgear, so the controller greatly improves condensation-preventing sensitivity of the switchgear and guarantees safe and reliable running of high-voltage equipment through the dual means.
Description
Technical field
The present invention relates to the controller of the inner anti-condensation of a kind of switch cubicle, to ensure the power equipment safety reliability service.
Background technology
China adopts automatic heating and dehumidification controller to prevent that the existing more than ten years of condensation are historical in switch cubicle; This heating and dehumidification controller guarantees that at anti-moist, anti-condensation the high-tension apparatus reliability service has played positive role, but in use in the area that has, some problems also occurred, for example: at southern plum rain season; Sometimes the air humidity of switch cubicle inside is higher; Even local existing dewfall phenomenon in the cabinet, owing to be installed in the degree that the inner condensation sensing station of cabinet does not arrive condensation, perhaps the condensation transducer receives dust and gas pickling in the air for a long time; The sensitivity of transducer is affected; The condensation controller can not start heater in time, causes the effect of condensation control malfunctioning, brings threat for the safe operation of switchgear.
Usually the condensation controller that adopts now utilizes the condensation transducer to come to start or stop automatically heater work; From its control mechanism, there are two defectives: the one, this condensation transducer is the passive-type motion device, when promptly must aerial vapour pressure saturated, just arrives dew point temperature at body surface; When taking place, condensation just can drive heating work; And anti-condensation is restarted heating near the edge of condensation to eliminate condensation as the anti-accident important measures of electric cabinet, just lacks a prevention process; From safe and reliable angle, still far from being enough on reliability as an anti-accident measures; The 2nd, if condensation transducer installation site is improper; Characteristic changed after perhaps the surface of condensation transducer received the erosion of dust or gas; Though the cabinet inner metal surface has the dewfall phenomenon, the condensation controller still can not in time start the heater input, also can have serious consequences.
For switch cubicle; The metalwork surface temperature drops to dew point temperature when following in the cabinet, and the metal surface can form the globule, and this phenomenon is called dewfall (or title condensation); Whether dewfall depends on ambient temperature, and in-cabinet temperature and several variable quantity such as relative humidity, dew point temperature are determined.Dew point temperature is meant in the air of uniform temperature; The air that the maximum level of steam is called " saturated steam amount " this moment is called " saturated air ", and when saturation air temperature descends, airborne steam will condense into the globule; Contain the saturation of the air temperature of steam, be called dew point temperature.The factor that forms dewfall in the switch cubicle easily mainly contains: (1) area surroundings humidity is high, and temperature Change is big, is prone to the dewfall in the metal surface during cold and hot air exchange; (2) switch cubicle bottom is moist, even the cable trough that has has ponding, during water evaporation, when being lower than in the cabinet air themperature like metallic surface temperature, forms condensation in the metal surface; (3) equipment that has is in shut down condition, and in-cabinet temperature is lower than ambient temperature through regular meeting, causes that the metal surface has the globule to condense, and at this moment, in case switch cubicle puts into operation, accidents such as creepage, flashover takes place very easily.
Summary of the invention
Technical problem to be solved by this invention is to take place and prevention mechanism according to condensation; No longer adopt traditional condensation transducer; But utilize in the cabinet with the outer temperature sensor by-pass cock cabinet cabinet of cabinet in the outer temperature difference method of cabinet, make in-cabinet temperature all the time than outer the high 1-3 of temperature ℃ of cabinet, make not possess the condition that condensation takes place in the cabinet; Play the inner effect that condensation takes place of prevention switch cubicle; In cabinet, adopt the relative humidity in humidity sensor measurement and the control switch cabinet simultaneously, two methods improves the sensitivity of the anti-condensation of switch cubicle greatly, guarantees the high-tension apparatus safe and reliable operation.
For solving the problems of the technologies described above; The invention provides a kind of intelligent temperature difference type condensation-preventing controller for switchgear, form by humidity Acquisition Circuit, microprocessor, warning and display circuit, heating control circuit, air draft control circuit, 485 interface circuits and power circuit in in-cabinet temperature first Acquisition Circuit, in-cabinet temperature second Acquisition Circuit, the outer temperature collection circuit of cabinet, the cabinet.
The output of in-cabinet temperature first Acquisition Circuit and in-cabinet temperature second Acquisition Circuit is connected with the A/D mouth of microprocessor respectively; The output of the outer temperature collection circuit of cabinet is connected with the A/D port of microprocessor; Humidity Acquisition Circuit output is connected with the A/D port of microprocessor in the cabinet; The input of warning and display circuit is connected with the I/O mouth of microprocessor; The input of heating control circuit is connected with the I/O mouth of microprocessor, and the input of air draft control circuit is connected with the I/O mouth of microprocessor, and 485 interface circuits are connected with the serial ports of microprocessor; Power circuit respectively with the outer temperature collection circuit of in-cabinet temperature first Acquisition Circuit, in-cabinet temperature second Acquisition Circuit, cabinet, cabinet in humidity Acquisition Circuit, microprocessor, warning and display circuit, heating control circuit and air draft control circuit be connected, for they provide power supply.
The present invention has positive effect: (1) intelligent temperature difference type condensation-preventing controller for switchgear of the present invention; Utilize in the temperature sensor by-pass cock cabinet cabinet that cabinet is interior and cabinet is outer and temperature difference method outside the cabinet; Make in-cabinet temperature all the time than outer the high 1-3 of temperature ℃ of cabinet; Make not possess the condition that condensation takes place in the cabinet, play the inner effect that condensation takes place of prevention switch cubicle.(2) intelligent temperature difference type condensation-preventing controller for switchgear of the present invention adopts the relative humidity in humidity sensor measurement and the control switch cabinet in cabinet, replace the mode that tide is driven in long-term heating, has obviously energy-conservation effect.
Description of drawings
Fig. 1 is the intelligent temperature difference type condensation-preventing controller for switchgear structure principle chart of embodiment 1.
Embodiment
See shown in Figure 1; The intelligent temperature difference type condensation-preventing controller for switchgear of present embodiment is made up of humidity Acquisition Circuit, microprocessor, warning and display circuit, heating control circuit, air draft control circuit, 485 interface circuits and power circuit in in-cabinet temperature first Acquisition Circuit, in-cabinet temperature second Acquisition Circuit, the outer temperature collection circuit of cabinet, the cabinet.
The outer temperature collection circuit of in-cabinet temperature first Acquisition Circuit, in-cabinet temperature second Acquisition Circuit and cabinet all can adopt thermistor (10K Ω for example; 35K Ω), also can adopt digital temperature sensor (for example AD590, LM92), gather the switch cubicle internal and external temperature; According to the switch cubicle inside and outside temperature difference; Control heater and fan work prevent to occur in the switch cubicle condensation, temperature-measuring range and precision: 0-80 ℃ ± the %+1 word.
The humidity Acquisition Circuit adopts humidity sensor in the cabinet, hygrometric scope and precision: 20%-98%RH ± 5% in the cabinet.
Heating control circuit adopts relay (relay contact power requirement: 220VAC/5A); Send the work of control signal control heater through the temperature and humidity value of microprocessor collection, heating starting condition (wherein each satisfy promptly to start heating): during the outer temperature of (1) in-cabinet temperature one cabinet≤1 ℃; (2) during humidity in the cabinet＞70%RH; (3) during in-cabinet temperature≤5 ℃; (4) hand-operated forced heating.Heating stop condition (satisfy simultaneously following condition promptly stop heating): during the outer temperature of (1) in-cabinet temperature one cabinet＞2 ℃; (2) during in-cabinet temperature＞13 ℃; (3) during humidity in the cabinet≤60%RH.
The air draft control circuit adopts relay, and (the relay contact power requirement: 220VAC/5A), the temperature value through the microprocessor collection sends the work of control signal control air ejector fan, high temperature air draft entry condition: during in-cabinet temperature＞50 ℃; High temperature air draft stop condition: during in-cabinet temperature＜45 ℃.
485 interface circuits adopt baud rate 4800, MODBUS agreement.
Power circuit is made up of reduction voltage circuit, rectification circuit, filter circuit and voltage stabilizing circuit, and the input voltage range of power circuit is 220V ± 15%.
Microprocessor is selected PIC, NSP430,51 or AVR series etc. for use.
Claims (1)
1. intelligent temperature difference type condensation-preventing controller for switchgear; It is characterized in that, form by humidity Acquisition Circuit (4), microprocessor (5), warning and display circuit (6), heating control circuit (7), air draft control circuit (8), 485 interface circuits (9) and power circuit (10) in in-cabinet temperature first Acquisition Circuit (1), in-cabinet temperature second Acquisition Circuit (2), the outer temperature collection circuit (3) of cabinet, the cabinet; The output of in-cabinet temperature first Acquisition Circuit (1) is connected with the A/D port of microprocessor (5); The output of in-cabinet temperature second Acquisition Circuit (2) is connected with the A/D port of microprocessor (5); The output of the outer temperature collection circuit (3) of cabinet is connected with the A/D port of microprocessor (5); Humidity Acquisition Circuit (4) output is connected with the A/D port of microprocessor (5) in the cabinet; The input of warning and display circuit (6) is connected with the I/O mouth of microprocessor (5); The input of heating control circuit (7) is connected with the I/O mouth of microprocessor (5); The input of air draft control circuit (8) is connected with the I/O mouth of microprocessor (5); 485 interface circuits (9) are connected with the serial ports of microprocessor (5), and power circuit (10) is connected with in-cabinet temperature first Acquisition Circuit (1), in-cabinet temperature second Acquisition Circuit (2), the outer temperature collection circuit (3) of cabinet, the interior humidity Acquisition Circuit (4) of cabinet, microprocessor (5), warning and display circuit (6), heating control circuit (7) and air draft control circuit (8) respectively, for they provide power supply; Interior and the outer temperature difference method of cabinet of the temperature sensor by-pass cock cabinet cabinet that intelligent temperature difference type condensation-preventing controller for switchgear utilizes in the cabinet and cabinet is outer; Make in-cabinet temperature all the time than outer the high 1-3 of temperature ℃ of cabinet; Make and do not possess the condition that condensation takes place in the cabinet; In cabinet, adopt the relative humidity in humidity sensor measurement and the control switch cabinet simultaneously, two methods prevents condensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910029037A CN101783482B (en) | 2009-01-16 | 2009-01-16 | Intelligent temperature difference type condensation-preventing controller for switchgear |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910029037A CN101783482B (en) | 2009-01-16 | 2009-01-16 | Intelligent temperature difference type condensation-preventing controller for switchgear |
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| Publication Number | Publication Date |
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| CN101783482A CN101783482A (en) | 2010-07-21 |
| CN101783482B true CN101783482B (en) | 2012-09-05 |
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Families Citing this family (21)
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| CN102478866A (en) * | 2010-11-29 | 2012-05-30 | 西安康瑞矿用设备有限公司 | Temperature and humidity controller used in high voltage equipment |
| CN102419607A (en) * | 2011-12-07 | 2012-04-18 | 诸暨市供电局 | Device for automatically controlling humidity in a cabinet |
| CN102541108A (en) * | 2012-02-17 | 2012-07-04 | 苏州苏海亚电气有限公司 | Automatic humidification and dehumidification control device |
| CN102830737A (en) * | 2012-09-26 | 2012-12-19 | 中电装备恩翼帕瓦（山东）高压开关有限公司 | Automatic temperature regulating device for control cabinet |
| CN104682222A (en) * | 2013-11-29 | 2015-06-03 | 国家电网公司 | Solar condensation preventing device for switch cabinet |
| CN103944080B (en) * | 2014-05-04 | 2016-03-30 | 宁波懿德电气有限公司 | A kind of anti-condensation switch cabinet and dewing-proof method |
| CN103956661B (en) * | 2014-05-04 | 2016-02-17 | 宁波懿德电气有限公司 | A kind of switch cubicle and dewing-proof method |
| CN104298284A (en) * | 2014-09-23 | 2015-01-21 | 国网安徽省电力公司阜阳供电公司 | Dehumidification device for high-tension switch cabinet |
| CN104298286A (en) * | 2014-10-30 | 2015-01-21 | 浙江群力电气有限公司 | Internal environment regulating and controlling system of switch cabinet |
| CN104460786A (en) * | 2014-10-31 | 2015-03-25 | 苏州佑瑞检测技术有限公司 | Switch cabinet condensate monitoring and processing method |
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| CN104766542B (en) * | 2015-03-30 | 2017-11-07 | 苏州佳世达电通有限公司 | Display device |
| CN106843327A (en) * | 2015-12-07 | 2017-06-13 | 常州常工电子科技股份有限公司 | Anti-condensation control device in working state of circuit breaker instruction and cabinet |
| CN106765841A (en) * | 2016-12-01 | 2017-05-31 | 无锡赛孚电力环境控制设备有限公司 | A kind of electrical house temperature and humidity control anti-condensation system with cable duct |
| CN107204583A (en) * | 2017-05-19 | 2017-09-26 | 合肥尚强电气科技有限公司 | A kind of frost prevention switch cabinet |
| CN108131755B (en) * | 2017-12-14 | 2019-12-31 | 国家电网公司 | Temperature and humidity cooperative control method for electrical equipment assembly cabinet |
| CN107860738A (en) * | 2017-12-26 | 2018-03-30 | 吉林大学 | A kind of infrared CO of facilities horticulture with intelligent dehumidification function2Sensor and method |
| CN108075378B (en) * | 2018-01-11 | 2020-06-30 | 重庆市东泰电器实业有限公司 | Anti-condensation compensation cabinet body and compensation cabinet |
| CN112242656B (en) * | 2019-07-17 | 2022-05-27 | 江苏瀚晨电气科技有限公司 | Ring main unit capable of automatically controlling refrigeration air |
| CN111103911B (en) * | 2019-12-06 | 2021-11-05 | 珠海格力电器股份有限公司 | Heat dissipation device for mobile equipment and control method thereof |
| CN117878735B (en) * | 2024-03-12 | 2024-05-28 | 长沙普洛电气设备有限公司 | Condensation prevention method, system, terminal and storage medium for electric control cabinet |
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| CN101783482A (en) | 2010-07-21 |
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Owner name: CHANGZHOU PAZ FICK AUTOMATION TECHNOLOGY CO., LTD. Free format text: FORMER NAME: CHANGZHOU PACIFIC AUTOMATIC TECHNOLOGY CO., LTD. |
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Address after: 213022 B2, north of innovation and technology building, Xinbei District, Jiangsu, Changzhou Patentee after: Changzhou Paz Fick Automation Technology Co., Ltd. Address before: 213022 B2, north of innovation and technology building, Xinbei District, Jiangsu, Changzhou Patentee before: Changzhou Pasifeike Automation Technology Co., Ltd. |