CN109787098A - A kind of intelligent terminal box - Google Patents
A kind of intelligent terminal box Download PDFInfo
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- CN109787098A CN109787098A CN201910208838.2A CN201910208838A CN109787098A CN 109787098 A CN109787098 A CN 109787098A CN 201910208838 A CN201910208838 A CN 201910208838A CN 109787098 A CN109787098 A CN 109787098A
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Abstract
本发明公开了一种智能端子箱，包括智能箱体，设在智能箱体内的除湿箱体；除湿箱体的中部设有干燥装置，所述的干燥装置的上下两端分别设有上加热装置和下加热装置，所述的上加热装置与除湿箱体的顶部之间设有上双向风扇，所述的下加热装置与除湿箱体的底部之间设有下双向风扇，湿度检测传感器和PLC控制器，结构简单，通过设有的进风和出风，并通过干燥装置对进入的气体进行干燥加热，同时还能够对干燥机进行除湿，有效的防止了加热冷却后产生的凝露对智能端子箱造成损害。
The invention discloses a smart terminal box, comprising a smart box body, a dehumidification box body arranged in the smart box body; a drying device is arranged in the middle of the dehumidification box body, and upper heating devices are respectively provided at the upper and lower ends of the drying device and a lower heating device, an upper bidirectional fan is arranged between the upper heating device and the top of the dehumidification box, a lower bidirectional fan is arranged between the lower heating device and the bottom of the dehumidification box, a humidity detection sensor and a PLC The controller has a simple structure. It can dry and heat the incoming gas through the provided air inlet and outlet, and through the drying device, and can also dehumidify the dryer, effectively preventing the condensation generated after heating and cooling. damage to the terminal box.
Description
[technical field]
The invention mainly relates to electrical equipment more particularly to a kind of intelligent terminal boxes.
[background technique]
Terminal box of transformer substation is the intermediate link that the equipment such as outdoor electrical equipment and indoor observing and controlling, protection, communication are connect, one
As be mounted on by equipment nearby.When there was dampness in the air, the moist condensation accumulated water especially within rainy season, outdoor switch terminal box, easily
Cause insulation against ground resistance in direct-current secondary circuit to decline, serious person's insulation resistance drops to zero, thus formed DC positive power or
Negative supply ground connection.If causing direct current two points ground fault, DC insurance is caused to fuse, relay fail or malfunction, or even damage are set
It is standby, seriously threaten the safe operation of power grid.Terminal box dampness makes terminal block screw and connection sheet get rusty, and makes secondary terminals contact not
It is good, it so that current transformer terminal fever is even opened a way, cause relay fail or malfunction, cause accident.Mutual inductor voltage
It is bad it will cause observing and controlling, protective device operation exception, mistaking signal with switch, temperature signal termination contact, cause to run people
Error analysis is made in member's erroneous judgement.
The various electrical equipments of current electric system (switch, disconnecting switch, voltage transformer etc.) terminal box is observed, is checked each
Material, production, mounting process and the damp circuit of drive of class terminal box etc., find moisture weight in terminal box, cause terminal board
Terminal, screw easy-to-rust, easy-to-rust in cabinet, constitute a serious threat to the safe and reliable operation of electrical equipment.Such as: some terminals
The screw iron of case, easy-to-rust, part terminal box door lock size mismatches, not closely, Yi Songdong；The fire prevention of part terminal box
Imprecision is blocked, is caused into water；Part terminal box drives that damp circuit does not connect power supply or circuit is obstructed, causes to drive damp effect bad；
Part terminal box carries out driving tide operation very inconvenient because of the defect that designed originally；It is not in place that there are also management aspects, and thunderstorm does not have later
Have to unpack to be aerated in time and drives tide etc..
The case where for humidity condensation accumulated water existing for current terminal box of transformer substation inside, in order to set terminal box of transformer substation
It is standby to achieve the purpose that automatic sustainable dehumidifying, the sustainable automatic dehumidification system of a set of terminal box of transformer substation is developed, to prevent not-go-end
Sub- case makes moist and accident occurs and has great importance.
Foreign & Domestic Substations mostly use greatly traditional heating moisture separating device at present, often because being formed after moisture separating device heating
Aqueous vapor can not be discharged and be condensed at the top of terminal box for a long time, formed dewdrop suspension, eventually drop onto the equipment such as terminal block again
On, cause equipment short circuit or ground connection, it is undesirable to drive damp effect.In addition, common heating moisture separating device is also easy to damage, or even meeting
Occur leading to problems such as heating plate overheat burn out running equipment due to heating for a long time.And the damp heating device of general drive do not have it is logical
Letter and networking function, if the working condition of temperature and humidity controller in terminal box need to be understood, it is necessary to be maked an inspection tour one by one, heavy workload
And it is inefficient, it can not also accomplish to understand its working condition in real time.
Terminal box conventional dehumidification measure:
Install sealing strip additional
Plastic sealing strip is installed additional in case, cabinet door, prevents rainwater from entering box house, there is certain effect.According to many years
Operating experience, sealing strip are easily corroded, are peeled off, and substantially every 2-3 is just needed replacing once, and biggish in outer moisture
In the case of, the humidity of box house can not be effectively reduced, the case where equipment mildew, corrosion is more serious in cabinet, it cannot be guaranteed that setting
Standby safe operation.
Install heater additional
Generally used in the power system at present is the mating heater of moisture probe, starts heating when humidity is excessively high
Device heats humid air, and the humid air after making heating rises.Damp-heat air can generate energy after encountering top of the box cooling after rising
Condensation reduces dielectric level instead, is unfavorable for the safe operation of equipment, and moisture still remains in box house, cannot be effective
Reduce bin equipment interior humidity.In south, summer temperature is high, and the humidity heat that greatly the interior operation original part of upper bin generates is various
Cable skin aging is serious, easily causes equipment fault.
[summary of the invention]
It in order to overcome the disadvantages of the above prior art, can be to intelligence the object of the present invention is to provide a kind of structure is simple
The intelligent terminal box of component in intelligent box body will not be also influenced while cabinet is dried because of the condensation of generation.
In order to achieve the above objectives, the present invention uses following technical scheme, a kind of intelligent terminal box, including intelligent cabinet, if
In the intracorporal dehumidifying cabinet of intelligent box, the inside of the dehumidifying cabinet and the outside of intelligent cabinet pass through the first outer air vent road
Be connected with the second outer air vent road, the inside of the inside of the described dehumidifying cabinet and intelligent cabinet by ventilation pipe in first and
Ventilation pipe in second, the first outer air vent road are equipped with the first solenoid valve, set on the second outer air vent road
There is second solenoid valve, ventilation pipe is equipped with third solenoid valve in described first, and ventilation pipe is equipped in described second
4th solenoid valve；
The middle part of the dehumidifying cabinet is equipped with drying device, and the upper and lower ends of the drying device, which are respectively equipped with, to be added
Thermal and lower heating device are equipped with upper bidirectional fan between the upper heating device and the top for the cabinet that dehumidifies, described
Lower bidirectional fan is equipped between lower heating device and the bottom for the cabinet that dehumidifies；
The first moisture detection sensor for detecting humidity in drying device is equipped in the dehumidifying cabinet, it is described
The second moisture detection sensor for detecting humidity in intelligent box body is equipped in intelligent box body；
It further include PLC controller, the output end and PLC of first moisture detection sensor and the second humidity sensor
The input terminal of controller is electrically connected, the output end of the PLC controller respectively with the first solenoid valve, second solenoid valve, third
Solenoid valve, the 4th solenoid valve, upper heating device, lower heating device, upper bidirectional fan and the electrical connection of lower bidirectional fan.
The first outer air vent road is located at the lower end of intelligent cabinet, and the second outer air vent road is located at intelligent box
The top of body, the third outer air vent road are equipped with strainer, which is located at the nozzle in third outer air vent road.
The intelligent box is also inlaid with display in vitro, which is electrically connected with the PLC.
The upper heating device and lower heating device are same heating device, are made of more electric heating tubes.
The drying device includes fixed being located at upper and lower ends in dehumidifying cabinet and being respectively equipped with air permeable plate and lower ventilative
Plate, the silica gel absorber being located between air permeable plate and lower air permeable plate, the air hole of the upper air permeable plate are equipped with upper two-way
The air hole of solenoid valve, the lower air permeable plate is equipped with lower bidirectional electromagnetic valve.
The beneficial effects of the present invention are: structure is simple, by the air inlet and the outlet being equipped with, and by drying device to entrance
Gas heating is dried, while can also dehumidify to drying machine, effectively prevent heating it is cooling after generate it is solidifying
Dew damages intelligent terminal box.
[Detailed description of the invention]
Fig. 1 is schematic structural view of the invention；
Fig. 2 is electric connection structure schematic diagram in the present invention；
Fig. 3 is the structural schematic diagram of drying device in the present invention.
In figure: 1- intelligence cabinet；2- dehumidifying cabinet；The first outer air vent of 3- road；The second outer air vent of 4- road；In 5- first
Ventilation pipe；Ventilation pipe in 6- second；The first solenoid valve of 7-；8- second solenoid valve；9- third solenoid valve；The 4th electromagnetism of 10-
Valve；Dual-direction electric fan under 11-；Heating device under 12-；The upper Dual-direction electric fan of 13-；The upper heating device of 14-；The first humidity sensor of 15-；
The second humidity sensor of 16-；17- display；18- drying device；19- strainer；The upper air permeable plate of 20-；Air permeable plate under 21-；On 22-
Bidirectional electromagnetic valve；Bidirectional electromagnetic valve under 23-；24- silica gel absorber.
[specific embodiment]
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, the embodiment being not all of, and it is not intended to limit range disclosed by the invention.In addition, with
In lower explanation, descriptions of well-known structures and technologies are omitted, obscures concept disclosed by the invention to avoid unnecessary.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment should fall within the scope of the present invention.
The various structural schematic diagrams for disclosing embodiment according to the present invention are shown in the attached drawings.These figures are not in proportion
It draws, wherein some details are magnified for the purpose of clear expression, and some details may be omitted.As shown in the figure
The shape in various regions, layer and relative size, the positional relationship between them out is merely exemplary, in practice may be due to
Manufacturing tolerance or technical restriction and be deviated, and those skilled in the art may be additionally designed as required have not
Similar shape, size, the regions/layers of relative position.
In context disclosed by the invention, when one layer/element is referred to as located at another layer/element "upper", the layer/element
Can may exist intermediate layer/element on another layer/element or between them.In addition, if in a kind of court
One layer/element is located at another layer/element "upper" in, then when turn towards when, the layer/element can be located at another layer/
Element "lower".
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1-3, a kind of intelligent terminal box of the present invention, including intelligent cabinet 1 are located in intelligent cabinet 1 and remove wet tank
Body 2, the inside of the dehumidifying cabinet 2 and the outside of intelligent cabinet 1 pass through the first outer air vent road 3 and the second outer air vent road
The inside of 4 conductings, the inside of the described dehumidifying cabinet 2 and intelligent cabinet 1 passes through snorkel in ventilation pipe 5 and second in first
Road 6, the first outer air vent road 3 are equipped with the first solenoid valve 7, and the second outer air vent road 4 is equipped with the second electricity
Magnet valve 8, ventilation pipe 5 is equipped with third solenoid valve 9 in described first, and ventilation pipe 6 is equipped with the 4th in described second
Solenoid valve 10；The lower section of intelligent cabinet 1 is arranged in the first outer air vent road 3, is mainly used for air inlet, outside described second
The intracorporal gas of case that will mainly dehumidify of ventilation pipe 4 carries out outlet, is arranged in the top of intelligent cabinet 1, in described first
Gas in intelligent cabinet 1 is mainly passed into dehumidifying cabinet 2 by ventilation pipe 5, and ventilation pipe 6 is main in described second
It is that the gas after dehumidifying and heating in cabinet 2 that will dehumidify is passed into intelligent cabinet 1, and then first ventilation pipe
5 are located at the lower part of intelligent cabinet 1, and ventilation pipe 6 is located at the top of intelligent cabinet 1 in described second；First electromagnetism
Valve 7, second solenoid valve 8, third solenoid valve 9 and the 4th solenoid valve 10 control the first outer air vent road, the second outer air vent respectively
Road, the ventilatory capacity threaded a pipe in first in ventilation pipe and the 4th；
The middle part of the dehumidifying cabinet 2 is equipped with drying device 18, and the upper and lower ends of the drying device 18 are set respectively
There are upper heating device 14 and lower heating device 12, is equipped between the upper heating device 14 and the top for the cabinet 2 that dehumidifies upper double
To fan 13, lower bidirectional fan 11 is equipped between the lower heating device 12 and the bottom for the cabinet 2 that dehumidifies；
The dehumidifying cabinet 2 is mainly to carry out heating and dehumidification to the gas of entrance, and then meet 1 inside institute of intelligent cabinet
The humidity requirement needed, the specific drying device include fixed being located at upper and lower ends in dehumidifying cabinet 2 and being respectively equipped with air permeable plate
20 and lower air permeable plate 21, the silica gel absorber 24 being located between air permeable plate 20 and lower air permeable plate 21, the upper air permeable plate 20
Air hole be equipped with upper bidirectional electromagnetic valve 22, the air hole of the lower air permeable plate 21 is equipped with lower bidirectional electromagnetic valve 23, is equipped with
Air permeable plate while can breathe freely, the silica gel absorber between air permeable plate can be fixed, the silica gel absorber being equipped with
With very strong moisture pick-up properties, while the moisture in the adsorbent after moisture absorption can be arranged in case of heating
Out.
The first moisture detection sensor 15 for detecting humidity in drying device 18 is equipped in the dehumidifying cabinet 2,
The second moisture detection sensor 16 for detecting humidity in intelligent cabinet 1 is equipped in the intelligent cabinet 1；Described first
Temperature detection sensor 15 is used to detect the humidity of the silica gel absorber in drying device 18, and will test value and timely send
It to PLC controller, is compared with the value of setting, second moisture detection sensor 16 is for detecting in intelligent cabinet 1
Humidity value, the value that will test is sent to PLC controller and compares and handle.
It further include PLC controller, the output end of first moisture detection sensor 15 and the second humidity sensor 16
Be electrically connected with the input terminal of PLC controller, the output end of the PLC controller respectively with the first solenoid valve 7, second solenoid valve
8, third solenoid valve 9, the 4th solenoid valve 10, upper heating device 14, lower heating device 12, upper bidirectional fan 13 and lower bidirectional fan
11 electrical connections.
The PLC controller is played the role of the mainly signal that issues to each sensor and is received, and with setting
Value compare, and the working condition of each component is controlled according to the result after comparison, thus PLC control belong to it is most general
Logical controller can directly be bought according to its function, belong to the common knowledge of the art, herein just not to its model
It is described in detail with structure.
Specifically during the work time, it when the first humidity sensor detects the humidity in intelligent cabinet 1, and will test
Information when being sent to PLC controller, compared with the humidity of setting, when humidity is greater than the value of setting, PLC control first
Solenoid valve is opened, and second solenoid valve is closed, and upper bidirectional electromagnetic valve and lower bidirectional electromagnetic valve are opened, and the 4th solenoid valve is opened, third
Solenoid valve is closed, while upper bidirectional fan, lower bidirectional fan, and upper heating device is opened, and the air outside intelligent cabinet 1 passes through the
It threads a pipe to enter in dehumidifying cabinet outside one and be heated, the gas after heating is dehumidified by silica gel absorber, after dehumidifying
Gas entered in intelligent cabinet 1 by ventilation pipe in second, realize the purpose of rapid moisture removal, while when the second humidity
When sensor detects that the humidity in first dehumidification device is greater than the value of setting, PLC control the first solenoid valve of control is closed, the 4th electricity
Magnet valve is closed, and third solenoid valve and second solenoid valve are opened, and the intracorporal gas of intelligent box is entered by ventilation pipe in first
It dehumidifies in cabinet, and after heating device is heated, is that internal silica gel absorber of crossing carries out heating and dehumidification, and will add
Air after heat dehumidifying is discharged by the second outer air vent road, and realization is handled silica gel absorber is crossed；
Simultaneously can also when the humidity of intelligent box house be greater than intelligent box body outside humidity when, upper bidirectional electromagnetic valve and
Lower bidirectional electromagnetic valve is closed, and the first solenoid valve, second solenoid valve, third solenoid valve and the 4th electromagnetism are fully open, and then to removing
The intracorporal gas of wet tank directly carries out heating and dehumidification by entering directly into intelligent box house from interior ventilation pipe after heating.
All components all electric energy offers in the embodiment are realized by the external boundary's power supply of intelligent box, are electrically connected simultaneously
Relationship belongs to the common knowledge of the art, it is not described in detail herein.
Particularly, during singly heating: when intelligent box house humidity is below 70%, and temperature is at 5 degree
When following, lower bidirectional fan operating heater (includes multiple heaters, that is, multiple heating tubes in lower heating device, which is
One of heating tube) work, when heater work is greater than 60 minutes, automatic alternate to other heating tube works, when
Heater and lower bidirectional fan stop working when intelligent box body temperature degree of reaching；Heat dress up and down when work was beyond 2 hours
It sets while starting；
Drive damp mode: when intelligent box house humidity is more than 80%, and when being greater than intelligent box body outer moisture, up and down pair
To starting fan, upper and lower heating device, the first solenoid valve, second solenoid valve, third solenoid valve and the 4th solenoid valve are opened, up and down
Bidirectional electromagnetic valve is closed, is switched to without desiccant circuit, and the fresh air outside cabinet is directly entered after filter screen, heater
Box house realizes rapid moisture removal purpose.
Drive damp mode 2: when intelligent box house humidity is more than 80%, and when less than intelligent box body outer moisture, up and down
Bidirectional fan running, upper and lower bidirectional electromagnetic valve are opened, dehumidify through desiccant, stop working when humidity is below 80%,
If intelligent box interior temperature is less than 10 degree during operation, while starting single heating mode,
Silica dehydrator mode: when outdoor humidity is less than 70%, bidirectional electromagnetic valve is opened, second solenoid valve and the 4th electromagnetism
Valve is closed, and bidirectional electromagnetic valve switches to desiccant mode, switches to the outer conduction mode of cabinet, and blower runs at high speed, and heater opens
It is dynamic, desiccant is carried out to drive tide, achievees the purpose that reuse again.
Further, in order to guaranteeing, enter that the intracorporal air of case is clean, in the third outer air vent road 3
It is equipped with strainer 19, which is located at the nozzle in third outer air vent road 3.
Further, in order to monitor temperature and humidity in real time, it is also inlaid with display 17 outside the intelligent cabinet 1,
The display 17 is electrically connected with the PLC.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (5)
1. a kind of intelligent terminal box, which is characterized in that including intelligent cabinet (1), the dehumidifying cabinet being located in intelligent cabinet (1)
(2), the inside of the dehumidifying cabinet (2) and the outside of intelligent cabinet (1) pass through logical outside the first outer air vent road (3) and second
The inside of feed channel (4) conducting, the inside of the dehumidifying cabinet (2) and intelligent cabinet (1) passes through ventilation pipe (5) in first
With second in ventilation pipe (6), the first outer air vent road (3) is equipped with the first solenoid valve (7), logical outside described second
Feed channel (4) is equipped with second solenoid valve (8), and ventilation pipe (5) is equipped with third solenoid valve (9) in described first, described
Second in ventilation pipe (6) be equipped with the 4th solenoid valve (10)；
The middle part of the dehumidifying cabinet (2) is equipped with drying device (18), and the upper and lower ends of the drying device (18) are distinguished
Equipped with upper heating device (14) and lower heating device (12), the upper heating device (14) and dehumidifying cabinet (2) top it
Between be equipped with upper bidirectional fan (13), the lower heating device (12) with dehumidifying cabinet (2) bottom between be equipped with down two-way wind
It fans (11)；
The first moisture detection sensor for detecting drying device (18) interior humidity is equipped in the dehumidifying cabinet (2)
(15), the second moisture detection sensor for detecting intelligent cabinet (1) interior humidity is equipped in the intelligent cabinet (1)
(16)；
It further include PLC controller, the output end of first moisture detection sensor (15) and the second humidity sensor (16)
Be electrically connected with the input terminal of PLC controller, the output end of the PLC controller respectively with the first solenoid valve (7), the second electromagnetism
Valve (8), third solenoid valve (9), the 4th solenoid valve (10), upper heating device (14), lower heating device (12), upper bidirectional fan
(13) it is electrically connected with lower bidirectional fan (11).
2. a kind of intelligent terminal box according to claim 1, which is characterized in that the first outer air vent road (3) is set
In the lower end of intelligent cabinet (1), the second outer air vent road (4) is located at the top of intelligent cabinet (1), outside the third
Ventilation pipe (3) is equipped with strainer (19), which is located at the nozzle in third outer air vent road (3).
3. a kind of intelligent terminal box according to claim 1, which is characterized in that the intelligent cabinet (1) is also inlayed outside
There are display (17), which is electrically connected with the PLC.
4. a kind of intelligent terminal box according to claim 1, which is characterized in that described upper heating device (14) He Xiajia
Thermal (12) is same heating device, is made of more electric heating tubes.
5. a kind of intelligent terminal box according to claim 1, which is characterized in that the drying device (18) includes fixing
It is located at dehumidifying cabinet (2) interior upper and lower ends and is respectively equipped with air permeable plate (20) and lower air permeable plate (21), be located at air permeable plate (20)
The air hole of silica gel absorber (24) between lower air permeable plate (21), the upper air permeable plate (20) is equipped with upper bi-directional electromagnetic
The air hole of valve (22), the lower air permeable plate (21) is equipped with lower bidirectional electromagnetic valve (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910208838.2A CN109787098B (en) | 2019-03-19 | 2019-03-19 | Intelligent terminal box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910208838.2A CN109787098B (en) | 2019-03-19 | 2019-03-19 | Intelligent terminal box |
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| CN109787098A true CN109787098A (en) | 2019-05-21 |
| CN109787098B CN109787098B (en) | 2024-04-16 |
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| CN201910208838.2A Active CN109787098B (en) | 2019-03-19 | 2019-03-19 | Intelligent terminal box |
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Cited By (4)
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| CN110296581A (en) * | 2019-08-06 | 2019-10-01 | 江苏铸能新能源设备有限公司 | A kind of greenhouse cultivation baking room and its operating method |
| CN114678790A (en) * | 2022-03-15 | 2022-06-28 | 国网江苏省电力有限公司南通供电分公司 | A kind of intelligent air volume adaptive dew-removing and cooling device and method for power ring main unit |
| CN115400557A (en) * | 2022-08-26 | 2022-11-29 | 国网河北省电力有限公司电力科学研究院 | Ring main unit environment-friendly insulating gas adjusting device |
| CN115513869A (en) * | 2022-11-04 | 2022-12-23 | 江苏中天电气有限公司 | Movable aluminum alloy quick-connection bridge |
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Cited By (5)
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| CN114678790A (en) * | 2022-03-15 | 2022-06-28 | 国网江苏省电力有限公司南通供电分公司 | A kind of intelligent air volume adaptive dew-removing and cooling device and method for power ring main unit |
| CN115400557A (en) * | 2022-08-26 | 2022-11-29 | 国网河北省电力有限公司电力科学研究院 | Ring main unit environment-friendly insulating gas adjusting device |
| CN115513869A (en) * | 2022-11-04 | 2022-12-23 | 江苏中天电气有限公司 | Movable aluminum alloy quick-connection bridge |
| CN115513869B (en) * | 2022-11-04 | 2023-03-10 | 江苏中天电气有限公司 | Movable aluminum alloy quick-connection bridge |
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