CN112034914A - Zigbee wireless communication-based temperature and humidity control system for terminal box of transformer substation - Google Patents
Zigbee wireless communication-based temperature and humidity control system for terminal box of transformer substation Download PDFInfo
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- CN112034914A CN112034914A CN202010989915.5A CN202010989915A CN112034914A CN 112034914 A CN112034914 A CN 112034914A CN 202010989915 A CN202010989915 A CN 202010989915A CN 112034914 A CN112034914 A CN 112034914A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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
- H02B1/24—Circuit arrangements for boards or switchyards
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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
- H02B1/56—Cooling; Ventilation
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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
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The invention discloses a temperature and humidity control system of a transformer substation terminal box based on Zigbee wireless communication, which comprises a temperature and humidity sensing module, a microprocessor, Zigbee terminal nodes, a Zigbee central node, an upper computer, a relay, a heater and a ventilating fan, wherein the temperature and humidity sensing module is connected with the microprocessor; the temperature and humidity sensing module is electrically connected with the microprocessor; the microprocessor is in communication connection with the Zigbee terminal node; the Zigbee terminal node is in communication connection with the Zigbee central node; the Zigbee central node is in communication connection with the upper computer; the microprocessor is electrically connected with the relay; the relay is electrically connected with the heater and the ventilating fan. The temperature and humidity in the terminal box of the transformer substation can be monitored simultaneously, and closed-loop control of the temperature and humidity in the terminal box is automatically completed by combining a relay through judging whether the temperature and the humidity exceed the limit value; networking is carried out through the Zigbee central node and the Zigbee terminal node, a wireless communication function is realized, and temperature and humidity data can be uploaded in a centralized manner; in addition, the upper computer can acquire external meteorological conditions in different time periods, and therefore the temperature and humidity limit value in the terminal box can be updated.
Description
Technical Field
The invention relates to the field of temperature and humidity control of a transformer substation terminal box, in particular to a temperature and humidity control system of a transformer substation terminal box based on Zigbee wireless communication.
Background
The terminal box of the existing transformer substation is mostly installed outdoors, and when the temperature and humidity in the air change, condensation and water dripping phenomena can be caused, so that the secondary circuit is damaged in an insulation manner, and even a short circuit is caused. If the terminal block or the contact of the relay is short-circuited, protection malfunction can be directly caused. In addition, when the terminal box is wet, the terminal row screws and the connecting sheets are easy to rust, which may cause poor contact of the secondary terminals, so that the current loop terminals are heated, even open circuits are caused, which causes protection refusal or misoperation and causes safety accidents. These factors all seriously affect the safe and stable operation of the substation. However, most of the existing substation terminal box control systems lack a communication function, cannot upload temperature and humidity data in a centralized manner, often only use a heater to prevent condensation, only use the heater to prevent condensation from the temperature without considering the generation of condensation from the humidity, and use of the heater for a long time can accelerate the aging of electrical equipment in the terminal box and threaten the stable operation of the equipment. In addition, the existing substation terminal box control system does not have the function of changing the temperature and humidity limit value inside the control system according to the external meteorological conditions in different time periods.
In the prior art, a chinese patent publication No. CN106681409A discloses a temperature and humidity control system and a control method for a terminal box of a transformer substation in 2017, 05 and 17, which can measure temperature and humidity information inside and outside the terminal box at the same time, destroy the conditions of condensation points generating air condensation of the terminal box by turning on or off a heater, and preset heating time in combination with weather forecast to prevent the condensation. Although this scheme can play the effect of preventing the condensation to a certain extent, but the aforesaid problem has not been solved to it, consequently, user's urgent need for a transformer substation terminal box temperature humidity control system based on Zigbee radio communication.
Disclosure of Invention
The invention provides a Zigbee wireless communication-based transformer substation terminal box temperature and humidity control system, which aims to solve the problems that the conventional transformer substation terminal box control system lacks a communication function, is only prevented from being condensed from temperature but not from humidity, cannot change internal temperature and humidity limit values according to external meteorological conditions in different time periods and the like.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a temperature and humidity control system of a transformer substation terminal box based on Zigbee wireless communication comprises a temperature and humidity sensing module, a microprocessor, Zigbee terminal nodes, a Zigbee central node, an upper computer, a relay, a heater and a ventilating fan, wherein the temperature and humidity sensing module is connected with the microprocessor; wherein: the output end of the temperature and humidity sensing module is electrically connected with the input end of the microprocessor; the microprocessor is in communication connection with the Zigbee terminal node; the Zigbee terminal node is in communication connection with the Zigbee central node; the Zigbee central node is in communication connection with the upper computer; the output end of the microprocessor is electrically connected with the input end of the relay; and the output end of the relay is electrically connected with the input end of the heater and the input end of the ventilating fan respectively.
Preferably, the temperature and humidity sensing module comprises a temperature sensing module and a humidity sensing module; wherein: the output end of the temperature sensing module is electrically connected with the input end of the microprocessor; and the output end of the humidity sensing module is electrically connected with the input end of the microprocessor.
Preferably, the temperature and humidity sensing module performs software compensation, and a temperature coefficient compensation equation established during the software compensation is as follows:
RHcompensatedT＝RHactualT+f(Tactual) ①；
f(Tactual)＝-0.15*(25-Tactual) ②；
wherein RH iscompensatedTCompensated ambient relative humidity% RH; RH (relative humidity)actualTOriginal ambient humidity% RH; t isactualThe temperature of the humidity sensing module; f (T)actual) Is a temperature compensation coefficient; 25 denotes a temperature of 25 ℃.
Preferably, the microprocessor is a GD32E230C8T6 type microprocessor.
Preferably, the Zigbee terminal node includes a data sending node and a data receiving node; wherein: the data sending node is in communication connection with the microprocessor; the data receiving node is in communication connection with the Zigbee central node.
Preferably, the Zigbee central node and the Zigbee terminal node are networked using a star topology structure.
Preferably, the Zigbee central node and the Zigbee terminal node interact in an active polling manner.
Preferably, the upper computer acquires real-time meteorological data through a web crawler, and then calculates the average dew point of the environment and updates the temperature and humidity limit value by using the real-time meteorological data.
Preferably, the microprocessor judges whether the heater needs to be started through the relay according to the average dew point calculated by the upper computer and the updated temperature limit value.
Preferably, the microprocessor judges whether the ventilation fan needs to be started through the relay according to the humidity limit value updated by the upper computer.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the functions of monitoring and analyzing the temperature and the humidity in the terminal box of the transformer substation are realized simultaneously through the cooperation of the temperature and humidity sensing module, the microprocessor and the upper computer, and the closed-loop control of the temperature and the humidity in the terminal box is automatically completed by judging whether the temperature and the humidity exceed the limit values and combining with the relay; networking is performed through the Zigbee central node and the Zigbee terminal nodes, so that a wireless communication function is realized, and temperature and humidity data can be uploaded in a centralized manner; in addition, the upper computer can acquire the external meteorological conditions in different time periods, and the updating of the temperature and humidity limit value in the terminal box is realized based on the external meteorological conditions. The invention has the advantages of low power consumption and easy maintenance, greatly saves hardware cost and labor cost, and improves the integration and intelligence level of the sensor.
Drawings
FIG. 1 is a schematic block diagram of a system according to the present invention;
fig. 2 is a schematic diagram of Zigbee wireless communication networking according to the present invention;
FIG. 3 is a flow chart of temperature and humidity information processing according to the present invention;
FIG. 4 is a flow chart of a temperature and humidity control method according to the present invention;
the reference numbers in the figures represent respectively: 1, a temperature and humidity sensing module; 2, a microprocessor; 3Zigbee terminal nodes; 4Zigbee central node; 5, an upper computer; 6, a relay; 7 a heater; 8, ventilating fans; 11 a temperature sensing module; 12 a humidity sensing module; 31 a data transmitting node; 32 data receiving node.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a temperature and humidity control system of a transformer substation terminal box based on Zigbee wireless communication includes a temperature and humidity sensing module 1, a microprocessor 2, a Zigbee terminal node 3, a Zigbee central node 4, an upper computer 5, a relay 6, a heater 7, and a ventilation fan 8; wherein: the output end of the temperature and humidity sensing module 1 is electrically connected with the input end of the microprocessor 2; the microprocessor 2 is in communication connection with the Zigbee terminal node 3; the Zigbee terminal node 3 is in communication connection with the Zigbee central node 4; the Zigbee central node 4 is in communication connection with an upper computer 5; the output end of the microprocessor 2 is electrically connected with the input end of the relay 6; and the output end of the relay 6 is respectively and electrically connected with the input end of the heater 7 and the input end of the ventilating fan 8.
In the scheme, the temperature and humidity sensing module 1 is responsible for collecting temperature and humidity data; the microprocessor 2 is responsible for receiving the analog signals collected by the temperature and humidity sensing module 1, performing A/D conversion, and then sending the obtained digital signals through a synchronous asynchronous receiver transmitter (USART) port; the Zigbee terminal node 3 is responsible for receiving the digital signals converted by the microprocessor 2 and transmitting the digital signals to the Zigbee central node 4 through wireless transmission; after the Zigbee central node 4 concentrates the temperature and humidity data in each terminal box, the signal is sent to the upper computer 5; the upper computer 5 acquires real-time meteorological data of the area, analyzes the real-time meteorological data by combining with the received temperature and humidity data, calculates a real-time dew point, readjusts temperature and humidity limit values in the terminal boxes, and returns the new limit values to the Zigbee terminal nodes 3 in each terminal box through the Zigbee central node 4; the Zigbee terminal node 3 sends the new limit value to the microprocessor 2 to determine whether to start the heater 7 or the ventilation fan 8 through the relay 6 to control the temperature and humidity in the terminal box and maintain a good state.
Specifically, the temperature and humidity sensing module 1 includes a temperature sensing module 11 and a humidity sensing module 12; wherein: the output end of the temperature sensing module 11 is electrically connected with the input end of the microprocessor 2; the output end of the humidity sensing module 12 is electrically connected with the input end of the microprocessor 2.
In the above scheme, the temperature sensing module 11 includes a band gap type temperature sensing probe, the humidity sensing module 12 includes a capacitance type humidity sensing probe, the probes are packaged by MEMS technology, and the product modular design is adopted; the MEMS is called a Micro-Electro-Mechanical System (Micro-Electro-Mechanical System), and the MEMS gas sensor has the characteristics of small equipment volume, easier integration, imaging cost saving, simple maintenance, high stability, high response speed, low power consumption and the like.
Specifically, the temperature and humidity sensing module 1 completes software compensation by itself, and a temperature coefficient compensation equation established during the software compensation is as follows:
RHcompensatedT＝RHactualT+f(Tactual) ①；
f(Tactual)＝-0.15*(25-Tactual) ②；
wherein RH iscompensatedTCompensated ambient relative humidity% RH; RH (relative humidity)actualTOriginal ambient humidity% RH; t isactualIs the humidity sensing module 12 temperature; f (T)actual) Is a temperature compensation coefficient; 25 denotes a temperature of 25 ℃.
In the above scheme, the default resolution of the temperature and humidity sensing module 1 is set to 14-bit temperature readings and 12-bit relative humidity readings, the measurement data is transmitted in the form of two byte packets (i.e. 8-bit length frames), each byte is followed by an acknowledgement bit, and before calculating the physical value, the last two-bit status bit must be set to 0; when outputting STempThen, whatever the resolution chosen, the temperature is converted according to this formula (results are ℃):
wherein S isTempIs the output value of the temperature sensing module 11; when S is outputRHWhen, whichever resolution is chosen, the relative humidity is converted according to this formula (the result is% RH):
wherein S isRHIs the output value of the humidity sensing module 12, e.g. SRH0x7C80:31872, relative humidity 54.8% RH; in order to improve the measurement precision and stability, the temperature and humidity sensing module 1 performs software compensation in a mathematical calculation mode, establishes a temperature coefficient compensation equation, finds an optimal fitting parameter and reduces the influence of temperature when measuring humidity; the first and the second formulas are software compensation process when the temperature exceeds 25 ℃.
In particular, the microprocessor 2 is a GD32E230C8T6 type microprocessor.
In the scheme, the GD32E230C8T6 type microprocessor is provided with a high-performance ARM 32-bit Cortex-M23, the highest working frequency can reach 72MHz, compared with a 8/16-bit processor, the code efficiency is higher, the power consumption is lower, the integration level is extremely high, an embedded Flash with the length of 64KB and an embedded SRAM with the length of 8KB are built in, the reading and writing speed is high, and data results and programs are convenient to store.
Specifically, the Zigbee terminal node 3 includes a data sending node 31 and a data receiving node 32; wherein: the data sending node 31 is in communication connection with the microprocessor 2; the data receiving node 32 is communicatively connected to the Zigbee central node 4.
In the above scheme, the data sending node 31 is responsible for receiving the digital signal converted by the microprocessor 2 and sending the digital signal to the Zigbee central node 4 through wireless transmission; and the data receiving node 32 is responsible for receiving the updated temperature and humidity limit value in the upper computer 5 returned by the Zigbee central node 4, and then transmitting the temperature and humidity limit value to the microprocessor 2.
As shown in fig. 2, specifically, the Zigbee central node 4 and the Zigbee terminal nodes 3 are networked by using a star topology.
In the above scheme, the established star topology network is a centralized control type network, the whole network is managed by centralized traffic control performed by the Zigbee central node 4, and communication between the nodes is performed through the Zigbee central node 4; each Zigbee terminal node 3 that sends temperature and humidity data of a sub-box needs to be sent to a Zigbee central node 4, and then sent to an upper computer by the Zigbee central node 4 for monitoring, processing, and the like; the system is not only simple to control, but also convenient to diagnose faults and isolate.
Specifically, the Zigbee central node 4 and the Zigbee terminal node 3 interact with each other in an active polling manner.
In the above scheme, each Zigbee terminal node 3 has its own unique ID number, and the Zigbee central node 4 actively queries whether there is data to be sent according to the ID number of the Zigbee terminal node 3 in sequence, and if some Zigbee terminal node 3 has data to be sent to the Zigbee central node 4, the Zigbee central node 4 starts to process the received data, which effectively avoids the problems of collision in communication between the nodes, and the like.
As shown in fig. 3, specifically, the upper computer 5 obtains real-time weather data through a web crawler, and then calculates an average dew point of the environment and updates the temperature and humidity limit value by using the real-time weather data.
In the above scheme, the upper computer 5 can automatically capture real-time meteorological data of the area from the internet (such as hectometery weather and China meteorological office website) through a web crawler to obtain outdoor temperature and humidity, so that data are provided for the upper computer 5 to calculate dew points, and the function of adjusting the temperature and humidity limit values of the terminal box according to real-time meteorological conditions is also realized; with reference to the drawings, it can be seen that the whole process of processing the temperature and humidity information is as follows: zigbee terminal nodes 3 in each terminal box send temperature and humidity data in the terminal box to an upper computer 5 through a Zigbee central node 4, the upper computer 5 acquires real-time meteorological data of a region from the internet through a crawler, an information processing system of the upper computer 5 combines the temperature and humidity data in the terminal box and the real-time meteorological data of the region to update temperature and humidity limit values, the temperature and humidity limit values are sent to the Zigbee terminal nodes 5 in each terminal box through the Zigbee central node 4, the updated limit values are transmitted to a microprocessor 2 through the Zigbee terminal nodes 5, and finally the temperature and humidity in the terminal box is regulated and controlled by the microprocessor 2.
As shown in fig. 4, specifically, the microprocessor 2 determines whether the heater 7 needs to be activated through the relay 6, based on the average dew point calculated by the upper computer 5 and the updated temperature limit value.
In the above scheme, after the upper computer 5 obtains the outdoor temperature T1, the outdoor humidity RH1, the terminal box internal temperature T2 and the terminal box internal humidity RH2, the dew point temperatures Td1 and Td2 are calculated, an average dew point Td is obtained, the temperature limit value is updated, and the data is returned to the microprocessor 2; when 0 is present<When T2-Td is less than or equal to 3 and T2-T1 is more than 0, the microprocessor 2 starts the heater 7 through the relay 6 to heat; when T2-Td > 3, the microprocessor 2 stops the heater 7 through the relay 6; wherein, the dew point temperature Td1, Td2 and the average dew point Td are obtained by approximate calculation formula:
wherein the temperature T is temperature and the unit is; td is the dew point, in units; relative humidity RH as a percentage; ln represents a natural logarithm; the constant a is 17.27; the constant b is 237.7 ℃.
Specifically, the microprocessor 2 judges whether the ventilation fan 8 needs to be started through the relay 6 according to the humidity limit value updated by the upper computer 5.
In the scheme, after the upper computer 5 acquires the outdoor temperature T1, the outdoor humidity RH1, the terminal box internal temperature T2 and the terminal box internal humidity RH2, the size of the RH1 is judged, when the RH1 is greater than 60% RH, the humidity limit value is updated to RH0, and data are returned to the microprocessor 2; when RH2 is more than RH0, the microprocessor 2 starts the ventilation fan 8 through the relay 6 to ventilate; when RH2 < RH0, the microprocessor 2 stops the ventilation fan 8 through the relay 6.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A temperature and humidity control system of a transformer substation terminal box based on Zigbee wireless communication is characterized by comprising a temperature and humidity sensing module (1), a microprocessor (2), a Zigbee terminal node (3), a Zigbee central node (4), an upper computer (5), a relay (6), a heater (7) and a ventilating fan (8); wherein:
the output end of the temperature and humidity sensing module (1) is electrically connected with the input end of the microprocessor (2);
the microprocessor (2) is in communication connection with the Zigbee terminal node (3);
the Zigbee terminal node (3) is in communication connection with the Zigbee central node (4);
the Zigbee central node (4) is in communication connection with the upper computer (5);
the output end of the microprocessor (2) is electrically connected with the input end of the relay (6);
the output end of the relay (6) is electrically connected with the input end of the heater (7) and the input end of the ventilating fan (8) respectively.
2. The Zigbee wireless communication-based temperature and humidity control system for the terminal box of the transformer substation based on the Zigbee wireless communication as claimed in claim 1, wherein the temperature and humidity sensing module (1) comprises a temperature sensing module (11) and a humidity sensing module (12); wherein:
the output end of the temperature sensing module (11) is electrically connected with the input end of the microprocessor (2);
the output end of the humidity sensing module (12) is electrically connected with the input end of the microprocessor (2).
3. The Zigbee wireless communication-based temperature and humidity control system for the terminal box of the transformer substation, according to claim 1, is characterized in that the temperature and humidity sensing module (1) performs software compensation, and a temperature coefficient compensation equation established during the software compensation is as follows:
RHcompensatedT＝RHactualT+f(Tactual) ①；
f(Tactual)＝-0.15*(25-Tactual) ②；
wherein RH iscompensatedTCompensated ambient relative humidity (% RH); RH (relative humidity)actualTAs the original ambient humidity (% RH); t isactualThe temperature of the humidity sensing module; f (T)actual) Is a temperature compensation coefficient; 25 denotes a temperature of 25 ℃.
4. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 1, wherein the microprocessor (2) is a GD32E230C8T6 type microprocessor.
5. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 1, wherein the Zigbee terminal node (3) comprises a data sending node (31) and a data receiving node (32); wherein:
the data sending node (31) is in communication connection with the microprocessor (2);
the data receiving node (32) is in communication connection with the Zigbee central node (4).
6. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 1, wherein the Zigbee central node (4) and the Zigbee terminal nodes (3) are networked by adopting a star-shaped topological structure.
7. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 1, wherein the interaction between the Zigbee central node (4) and the Zigbee terminal node (3) is performed in an active polling manner.
8. The Zigbee wireless communication-based temperature and humidity control system for the terminal box of the transformer substation, as claimed in claim 1, wherein the upper computer (5) acquires real-time meteorological data through a web crawler, and then calculates an average dew point of the environment by using the real-time meteorological data and updates the temperature and humidity limit value.
9. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 8, wherein the microprocessor (2) judges whether the heater (7) needs to be started through the relay (6) according to the average dew point calculated by the upper computer (5) and the updated temperature limit value.
10. The substation terminal box temperature and humidity control system based on Zigbee wireless communication of claim 8, wherein the microprocessor (2) judges whether the ventilation fan (8) needs to be started through the relay (6) according to the updated humidity limit value of the upper computer (5).
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| CN113342099B (en) * | 2021-07-16 | 2022-03-18 | 宜昌天宇科技有限公司 | System and method for intelligent temperature and humidity control of concrete in grid division mode |
| CN113659476A (en) * | 2021-09-11 | 2021-11-16 | 国网山东省电力公司烟台供电公司 | Anti-condensation self-starting ventilation device and anti-condensation method for 10kV ring main unit |
| CN113867458A (en) * | 2021-10-25 | 2021-12-31 | 福建省力得自动化设备有限公司 | Primary and secondary fusion ring net cage monitoring system based on Internet of things |
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