CN107817713A - A kind of automatic electric device and control system for detecting humidity - Google Patents
A kind of automatic electric device and control system for detecting humidity Download PDFInfo
- Publication number
- CN107817713A CN107817713A CN201610832948.2A CN201610832948A CN107817713A CN 107817713 A CN107817713 A CN 107817713A CN 201610832948 A CN201610832948 A CN 201610832948A CN 107817713 A CN107817713 A CN 107817713A
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- Prior art keywords
- air duct
- intelligent controller
- humidity
- external member
- automatic electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001514 detection method Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 230000015654 memory Effects 0.000 claims description 5
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000741 silica gel Substances 0.000 description 7
- 229910002027 silica gel Inorganic materials 0.000 description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 241000233855 Orchidaceae Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2604—Test of external equipment
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of automatic electric device and control system for detecting humidity, belong to automatic control technology field, the automatic electric device includes air duct external member, intelligent controller, Temperature Humidity Sensor, upper mounting flange and lower mounting flange, air duct external member upper and lower ends are connected with upper mounting flange and lower mounting flange respectively, Temperature Humidity Sensor is located at air duct external member side wall, and electrically connected with intelligent controller, intelligent controller is connected located at the outside of air duct external member and with Surveillance center.Control system carries out outside Temperature Humidity Sensor control and data transfer, and relay output control by internal 1 programmable logic device (CPLD) of Local bus bus extensions by programming logic in CPLD pieces.The present invention is used to detect the air humidity in oil-filling type electrical equipment respiration channel, and when humidity reaches setting value, provides alarm signal, and prompting maintenance personnel change dehumidizer.
Description
Technical field
The present invention relates to automatic control technology field, is to be related to a kind of automatic electric device for detecting humidity specifically
And control system.
Background technology
Oil-filling type electrical equipment (it is main to include oil-filling type electrical equipment, such as power transformer, distribution transformer, there is load to adjust
Compress switch, capacitor, reactor etc.) it is to use electrical equipment of the insulating oil as insulating materials, it is filled with insulation in its housing
Oil.In order to avoid the damage to caused by device housings of expanding with heat and contract with cold of insulating oil, general installation one is endless at the top of these equipment
The full oil conservater for filling oil, oil conservater are connected by pipeline with outside air, make expand with heat and contract with cold generation of the equipment with insulating oil
Breathing.
Its insulating properties is influenceed in order to avoid the moisture in air enters insulating oil, often adds one in the end of air pipe line
The dehydrating unit of colouring silica gel is filled with, in blueness when its silica gel is dry, pinkiness when moist.When silica gel is arrived in attendant's range estimation
During discoloration, i.e., silica gel is changed to ensure dehydrating unit normal work.But there are some drawbacks in this mode：Such a method
There was only the understanding of perception to the air humidity in air pipe line, not quantitative analyze data is for reference；Relied in detection process
In direct surveillance's dehydrating unit silica gel discoloration, without the means of automatic alarm/prompting；It also can not be in air pipe line
Air humidity carries out implementing monitoring.
Drawbacks described above, it is worth solving.
The content of the invention
In order to overcome the shortcomings of existing technology, the present invention provides a kind of automatic electric device for detecting humidity and control is
System, for detecting the air humidity in oil-filling type electrical equipment respiration channel, and when humidity reaches setting value, provide alarm letter
Number, prompting maintenance personnel change dehumidizer.
Technical solution of the present invention is as described below：
A kind of automatic electric device for detecting humidity, it is characterised in that including air duct external member, intelligent controller, temperature
Humidity sensor, upper mounting flange and lower mounting flange, the air duct external member are that middle part leads to provided with longitudinally through air
The column structure in road, its upper and lower ends are connected with fixed flange and the lower mounting flange respectively, fixed method
Orchid is connected with the air pipe line with oil-charging type electrical device, and the lower mounting flange is connected with moisture absorption apparatus, and the humiture passes
Sensor is located at the air duct external member side wall, and the Temperature Humidity Sensor electrically connects with the intelligent controller, described
Intelligent controller is located at the outside of the air duct external member, and the intelligent controller is connected with Surveillance center.
According to the present invention of such scheme, it is characterised in that the intelligent controller is provided with display device.
According to the present invention of such scheme, it is characterised in that the display device is LCD liquid crystal displays.
According to the present invention of such scheme, it is characterised in that the air duct external member upper and lower ends pass through spiral respectively
Structure is connected with fixed flange and the lower mounting flange.
According to the present invention of such scheme, it is characterised in that the intelligent controller is fixed on institute by riveting with gluing
State the outside of air duct external member.
According to the present invention of such scheme, it is characterised in that the intelligent controller is provided with LED light, the LED
Indicator lamp indicates the running status of the automatic electric device.
According to the present invention of such scheme, it is characterised in that also including environment humidity sensor, the ambient temperature and humidity
On the shell of the intelligent controller, it is electrically connected sensor with the intelligent controller.
A kind of control system for detecting humidity, it is characterised in that including CPU and programmable logic device (CPLD), the CPU
It is connected by internal Local bus buses with the programmable logic device (CPLD), the programmable logic device (CPLD) difference
Temperature Humidity Sensor and relay output are connected, the CPU is connected by the Memory Controller Hub of inside with SDRAM, and the CPU leads to
Internal digital power is crossed to be connected with external power source.
According to the present invention of such scheme, it is characterised in that the CPU also passes through the Local bus buses and ether
Net controller is connected, and the ethernet controller is realized with ethernet communication by RJ45 and is connected with Surveillance center.
According to the present invention of such scheme, it is characterised in that the CPU is controlled by internal FLASH controller, UART respectively
Device, USB controller and 12C controllers processed and the Flash, debugging serial ports and RS485, USB interface and environment of outside are warm and humid
Spend sensor connection.
According to the present invention of such scheme, its advantage is, the present invention can improve the intelligent level of transformer,
Reduce overall maintenance cost of the transformer in life cycle, it is possible to achieve the lean management to dehydrating breather；
The present invention is reduced because dehydrating breather safeguards the oil-filling type insulation of electrical installation aging brought not in time, is avoided in air
Humid air enters transformer, is effectively protected electrical equipment.
The present invention realizes effective monitoring in real time to the humidity in air pipe line, is easy to administrative staff to be better understood by equipment
Operation conditions, the support of the data of auxiliary is provided for the maintenance of equipment, overhaul.
Brief description of the drawings
Fig. 1 is the schematic diagram of installation site of the present invention.
Fig. 2 is the structural representation of automatic electric device of the present invention.
Fig. 3 is the Structure explosion diagram of automatic electric device of the present invention.
Fig. 4 is the structural representation of control system of the present invention.
In figure, 10, intelligent controller；21st, Temperature Humidity Sensor；22nd, environment humidity sensor；31st, lower fixation
It is blue；32nd, upper mounting flange；40th, air duct external member；50th, air duct；61st, humid air；62nd, dry air；71st, moisture absorption
Device；72nd, oil-charging type electrical device；721st, air；722nd, insulating oil.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is further described embodiment：
As Figure 1-3, a kind of automatic electric device for detecting humidity, including air duct external member 40, intelligent controller
10th, Temperature Humidity Sensor 21, environment humidity sensor 22, upper mounting flange 32 and lower mounting flange 31.
Air duct external member 40 is the column structure that middle part is provided with longitudinally through air duct 50, and its upper and lower ends is led to respectively
Helical structure is crossed to be connected with upper mounting flange 32 and lower mounting flange 31.
Upper mounting flange 32 is connected with the air pipe line of oil-charging type electrical device 72, lower mounting flange 31 and moisture absorption apparatus 71
Connection.Moisture is sucked away to form dry air after automatic electric device of the humid air 61 of moisture absorption apparatus 71 by detecting humidity
62 enter oil-charging type electrical device 72, and the state that air 721 and insulating oil 722 separate is formed in oil-charging type electrical device 72.
Temperature Humidity Sensor 21 is located at the side wall of air duct external member 40, and Temperature Humidity Sensor 21 and intelligent controller 10
Electrical connection, for measuring humidity and temperature in air duct 50, and by temperature and humidity data in the air duct 50 measured
Send the simulated measurement input circuit of intelligent controller 10 to；Environment humidity sensor 22 is located at the shell of intelligent controller 10
On, it is electrically connected with intelligent controller 10, for detecting the temperature and humidity of environment, and by the environment temperature measured and humidity number
According to the simulated measurement input circuit for sending intelligent controller 10 to, there is provided to operation maintenance personnel as reference value, to contrast air
The interior humiture with environment of pipeline.This causes the present invention to have ambient temperature, the detection function of humidity data.
Intelligent controller 10 passes through riveting and the gluing outside for being fixed on air duct external member 40, and intelligent controller 10
It is connected with Surveillance center.Intelligent controller 10 is built-in with CPU core core, control and testing board, power module, LCD display module, communication mould
The peripheral circuit of block, LED light and correlation.Exceed when intelligent controller 10 measures the data of the Temperature and Humidity module in air duct 50
During advance setting value, intelligent controller 10 drives LED to send alarm signal, and simultaneously defeated with hard contact and communication two ways
Go out alarm signal to Surveillance center, remind operation maintenance personnel to change the silica gel in moisture absorption apparatus.
Color LCD display device and LED lamplight instruction on intelligent controller 10, are easy to operations staff to check that equipment is run
Situation, to show the data of the Temperature and Humidity module in air duct, and the data of the Temperature and Humidity module of external environment condition, LED is indicated LCD liquid crystal displays
Lamp is with states such as the operation of instruction device, failure, alarm, communications；The power module uses 100-400V wide scope Switching Power Supplies,
Power of alterating and direct current can be inputted；The communication module employs anti-surge protection circuit；Intelligent controller 10 can with Ethernet, RS485,
The multiple network connected mode such as wireless network, support a variety of communication protocols such as Modbus, IEC61850.
As shown in figure 4, a kind of control system for detecting humidity, including CPU and programmable logic device (CPLD), CPU pass through
Internal Local bus buses are connected with programmable logic device (CPLD), and programmable logic device (CPLD) connects humiture biography respectively
Sensor and relay, global reliability is high, and security is good.
Overall architecture design of the present invention uses the ARM9+ built-in Linux operating systems of low-power consumption.Support ether Netcom
News, RS485 communications, and system in future Function Extension.
CPU is ARM9 processors, its dominant frequency 400MHz, core ARM920T.
CPU is connected by the Memory Controller Hub of inside with SDRAM, and SDRAM is 64MB internal memories.
CPU is connected by the digital power of inside with external power source, and its exterior power supply uses 220V supplied by AC/DC electricity system
System, internal hardware design according to 4 grades of standards of EMC.
CPU is connected by the FLASH controller of inside with Nor Flash and the Nand Flash of outside.System configuration 8MB
Nor Flash, for storing Bootloader, (SuSE) Linux OS kernel, and file system etc..It is read-only during operation, ensure system
System operation is never collapsed.
System is configured with 128MB Nand Flash simultaneously, read-write during operation, for storing user program and data.
CPU is connected by the UART controller of inside with the debugging serial ports and RS485 of outside, and CPU is controlled by the USB of inside
Device processed is connected with the USB interface of outside.
CPU is connected by the I2C controllers of inside with outside extraneous sensor, can external multiple sensors, be easy to be
System upgrading and Function Extension.Internal system is configured with the retainable RTC real-time clocks of power down, ensures more than 10 years length of system clock
Phase operation will not lose.
CPU is connected by Local bus buses with ethernet controller, and ethernet controller passes through RJ45 and ether Netcom
News.
The present invention realizes that the air humidity in oil-filling type electrical equipment respiration channel detects and given the principle of alarm signal
For：
The present invention is arranged between the breathing pipeline and moisture absorption apparatus 71 of oil-charging type electrical device 72 (Fig. 1), and the present invention is set
There is hollow air duct external member 40, to ensure the eupnea of oil-filling type electrical equipment.In the inwall of air duct external member 40
On, a Temperature Humidity Sensor 21 is encapsulated, to measure the air humidity and temperature of entry/exit oil-filling type electrical equipment.Measured value with
The form of analog signal, is delivered in intelligent controller by cable.Therefore intelligent controller 10 can obtain pipe by computing
The humiture real time data of air in road.Staff can set the preset value of a humidity in a device as judgement in advance
The whether exceeded foundation of humidity.It is more than preset value when intelligent controller 10 measures volume humidity data, device just provides alarm automatically
Signal, staff's humidity over limit is reminded, it is necessary to change the silica gel in dehumidifier.The ambient temperature and humidity sensing set in the present invention
The real time data of device 22, can also be by cable transmission to intelligent controller, this group of data value for reference only.
The present invention has advantages below：
1) device has ambient temperature, the detection function of humidity data；
2) intelligent controller 10 is provided with LCD liquid crystal displays to show the data of the Temperature and Humidity module in air duct 50, and outside
The data of the Temperature and Humidity module of portion's environment.
3) there is LED light, with states such as the operation of instruction device, failure, alarm, communications on intelligent controller 10；
4) intelligent controller 10 can in the form of idle contact output relay signal；
5) present invention has exchange and the input of direct current 100-250V wide-range powers；
6) present invention has the multiple network connected modes such as Ethernet, RS485, wireless network, supports Modbus,
A variety of communication protocols such as IEC61850.
7) control system hardware includes CPU, programmable logic device (CPLD), ethernet controller, memory, power supply mould
Block.CPU is connected by internal Local bus buses with programmable logic device (CPLD), and programmable logic device (CPLD) connects respectively
Temperature Humidity Sensor and relay are connect, global reliability is high, and security is good.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Exemplary description has been carried out to patent of the present invention above in conjunction with accompanying drawing, it is clear that the realization of patent of the present invention not by
The limitation of aforesaid way, if the various improvement that the methodology of patent of the present invention and technical scheme are carried out are employed, or without
Improve and the design of patent of the present invention and technical scheme are directly applied into other occasions, within the scope of the present invention.
Claims (10)
1. a kind of automatic electric device for detecting humidity, it is characterised in that including air duct external member, intelligent controller, warm and humid
Sensor, upper mounting flange and lower mounting flange are spent, the air duct external member is that middle part is provided with longitudinally through air duct
Column structure, its upper and lower ends is connected with fixed flange and the lower mounting flange respectively, fixed flange
It is connected with the air pipe line with oil-charging type electrical device, the lower mounting flange is connected with moisture absorption apparatus, the temperature and humidity sensing
Device is located at the air duct external member side wall, and the Temperature Humidity Sensor electrically connects with the intelligent controller, the intelligence
Energy controller is located at the outside of the air duct external member, and the intelligent controller is connected with Surveillance center.
2. the automatic electric device of detection humidity according to claim 1, it is characterised in that set on the intelligent controller
There is display device.
3. the automatic electric device of detection humidity according to claim 2, it is characterised in that the display device is LCD
Liquid crystal display.
4. the automatic electric device of detection humidity according to claim 1, it is characterised in that in the air duct external member
Lower both ends are connected by helical structure with fixed flange and the lower mounting flange respectively.
5. the automatic electric device of detection humidity according to claim 1, it is characterised in that the intelligent controller passes through
Riveting and the gluing outside for being fixed on the air duct external member.
6. the automatic electric device of detection humidity according to claim 1, it is characterised in that set on the intelligent controller
There is LED light, the LED light indicates the running status of the automatic electric device.
7. the automatic electric device of detection humidity according to claim 1, it is characterised in that also passed including ambient temperature and humidity
Sensor, on the shell of the intelligent controller, it is electrically connected the environment humidity sensor with the intelligent controller.
8. a kind of control system for detecting humidity, it is characterised in that including CPU and programmable logic device (CPLD), the CPU leads to
Cross internal Local bus buses to be connected with the programmable logic device (CPLD), the programmable logic device (CPLD) connects respectively
Temperature Humidity Sensor and relay output are connect, the CPU is connected by the Memory Controller Hub of inside with SDRAM, and the CPU passes through
Internal digital power is connected with external power source.
9. the control system of detection humidity according to claim 8, it is characterised in that the CPU also passes through the Local
Bus buses are connected with ethernet controller, and the ethernet controller is by RJ45 and ethernet communication is realized and Surveillance center
Connection.
10. the control system of detection humidity according to claim 8, it is characterised in that the CPU passes through inside respectively
FLASH controller, UART controller, USB controller and I2C controllers and outside Flash, debugging serial ports and RS485,
USB interface and environment humidity sensor connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610832948.2A CN107817713A (en) | 2016-09-12 | 2016-09-12 | A kind of automatic electric device and control system for detecting humidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610832948.2A CN107817713A (en) | 2016-09-12 | 2016-09-12 | A kind of automatic electric device and control system for detecting humidity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107817713A true CN107817713A (en) | 2018-03-20 |
Family
ID=61601565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610832948.2A Pending CN107817713A (en) | 2016-09-12 | 2016-09-12 | A kind of automatic electric device and control system for detecting humidity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107817713A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018213341A1 (en) * | 2018-08-08 | 2020-02-13 | Siemens Aktiengesellschaft | Determination of the moisture input in a drying agent for transformers |
| CN114111900A (en) * | 2021-11-24 | 2022-03-01 | 广州国科科技有限公司 | Temperature and humidity sensing device and vaccine storage and transportation equipment |
| CN114397932A (en) * | 2021-12-16 | 2022-04-26 | 江苏吉泰电力器材有限公司 | Distribution board internal environment control device based on temperature and humidity relevance |
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|---|---|---|---|---|
| CN102759941A (en) * | 2012-07-19 | 2012-10-31 | 广州供电局有限公司 | Moisture-proof device for electrical equipment |
| CN103900839A (en) * | 2012-12-28 | 2014-07-02 | 华北电力科学研究院有限责任公司 | Method and system for monitoring respirator in transformer |
| CN204904119U (en) * | 2015-09-09 | 2015-12-23 | 三峡大学 | Terminal box humidity monitor control system based on singlechip and color sensor |
| CN205016338U (en) * | 2015-09-14 | 2016-02-03 | 国家电网公司 | Transformer breather |
| CN206002914U (en) * | 2016-09-12 | 2017-03-08 | 珠海智润电力科技有限公司 | A kind of automatic electric device of detection humidity and control system |
-
2016
- 2016-09-12 CN CN201610832948.2A patent/CN107817713A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759941A (en) * | 2012-07-19 | 2012-10-31 | 广州供电局有限公司 | Moisture-proof device for electrical equipment |
| CN103900839A (en) * | 2012-12-28 | 2014-07-02 | 华北电力科学研究院有限责任公司 | Method and system for monitoring respirator in transformer |
| CN204904119U (en) * | 2015-09-09 | 2015-12-23 | 三峡大学 | Terminal box humidity monitor control system based on singlechip and color sensor |
| CN205016338U (en) * | 2015-09-14 | 2016-02-03 | 国家电网公司 | Transformer breather |
| CN206002914U (en) * | 2016-09-12 | 2017-03-08 | 珠海智润电力科技有限公司 | A kind of automatic electric device of detection humidity and control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018213341A1 (en) * | 2018-08-08 | 2020-02-13 | Siemens Aktiengesellschaft | Determination of the moisture input in a drying agent for transformers |
| CN114111900A (en) * | 2021-11-24 | 2022-03-01 | 广州国科科技有限公司 | Temperature and humidity sensing device and vaccine storage and transportation equipment |
| CN114397932A (en) * | 2021-12-16 | 2022-04-26 | 江苏吉泰电力器材有限公司 | Distribution board internal environment control device based on temperature and humidity relevance |
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