CN113517689B - Be applied to line impedance orthotic devices of new forms of energy microgrid - Google Patents
Be applied to line impedance orthotic devices of new forms of energy microgrid Download PDFInfo
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- CN113517689B CN113517689B CN202110729063.0A CN202110729063A CN113517689B CN 113517689 B CN113517689 B CN 113517689B CN 202110729063 A CN202110729063 A CN 202110729063A CN 113517689 B CN113517689 B CN 113517689B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a line impedance correction device applied to a new energy microgrid, which comprises a protection box with a protection function, an impedance tester used for testing a circuit of the microgrid in the protection box, a distributed power supply inverter used for adjusting a circuit of the microgrid and a single chip microcomputer used for intelligent control, wherein the inner wall of the protection box is connected with a buffer support mechanism used for supporting and fixing, the top end of the protection box is connected with a wind power rotating mechanism utilizing wind power, the top end of the protection box is connected with two symmetrically arranged water receiving boxes of which the inner walls are connected with liquid level sensors, the bottom ends of the water receiving boxes are communicated with water outlet pipes with electromagnetic valves, two sides of the protection box are respectively communicated with hydraulic rotating mechanisms utilizing water energy corresponding to the water outlet pipes, and the inner wall of the protection box is also connected with a heat energy mechanism. This be applied to new forms of energy microgrid's circuit impedance orthotic devices can not only carry out the impedance correction to the circuit, can also utilize the nature to assist the heat dissipation.
Description
Technical Field
The invention belongs to the technical field of new energy micro-grids, and particularly relates to a line impedance correction device applied to a new energy micro-grid.
Background
The micro-grid is also translated into a micro-grid, and refers to a small power generation and distribution system which is composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protection device and the like.
The micro-grid aims to realize flexible and efficient application of distributed power supplies and solve the problem of grid connection of the distributed power supplies with large quantity and various forms. The development and extension of the micro-grid can fully promote the large-scale access of distributed power sources and renewable energy sources, realize the high-reliability supply of various energy source types of loads, and is an effective mode for realizing an active power distribution network, so that the traditional power grid is transited to a smart power grid.
When the microgrid is applied, the dispersibility of the microgrid can affect the impedance value, and the impedance value of the line can affect the quality of an inverter control strategy, so that aiming at the current situation, the design and production of the line impedance correction device applied to the new energy microgrid are urgently needed to meet the actual use requirement.
Disclosure of Invention
The invention aims to provide a line impedance correction device applied to a new energy microgrid, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a line impedance correction device applied to a new energy microgrid comprises a protection box with a protection function, an impedance tester in the protection box for testing the microgrid, a distributed power inverter for adjusting a circuit of the microgrid and a singlechip for intelligent control,
the utility model discloses a hydraulic protection box, including guard box, water receiving box, water inlet pipe, water outlet pipe, heat dissipation mechanism, the inner wall of guard box is connected with and is used for supporting fixed buffering supporting mechanism, the top of guard box is connected with the wind-force slewing mechanism who utilizes wind-force, the top of guard box is connected with the water receiving box that the inner wall that two symmetries set up is connected with level sensor, the bottom intercommunication of water receiving box has the outlet pipe that has the solenoid valve, the both sides of guard box communicate the hydraulic power slewing mechanism who utilizes hydroenergy that corresponds with the outlet pipe respectively, the inner wall of guard box still is connected with heat energy mechanism, the inner wall of guard box is connected with can with circulation heat dissipation mechanism with wind-force slewing mechanism, water conservancy slewing mechanism and heat energy mechanism complex.
In a further embodiment, the wind power rotating mechanism comprises a transverse bearing seat connected with the inner wall of a circular channel arranged at the top end of the protection box, a rotating rod connected with the inner wall of the transverse bearing seat, a wind wheel connected with the periphery of the upper half part of the rotating rod, a transverse bevel gear connected with the bottom end of the rotating rod through a vertical electric telescopic rod, and an active fan blade connected with the periphery of the vertical electric telescopic rod.
In a further embodiment, the hydraulic rotating mechanism comprises a vertical bearing seat connected with the inner wall of a circular channel formed in the side surface of the protection box, a rotating rod connected with the inner wall of the vertical bearing seat, a water wheel connected with the periphery of one side end of the protection box and arranged on the rotating rod, an idler gear connected with one end of the rotating rod through a transverse electric telescopic rod, and another driving fan blade connected with the periphery of the electric telescopic rod.
In a further embodiment, the heat energy mechanism is including connecting the gasbag that the boiling liquid of low boiling point has been held to the inner chamber of connecting in spacing box, the spacing box that the effect of heat conduction is good of the vertical inner wall of guard box, the roof that the gasbag top is connected and the gear chain that the roof passes through linear electric motor to be connected, four vertical inner walls of spacing box have all been seted up and have been connected with the slide rail, four sides of roof all are connected with the slider with slide rail sliding connection.
In a further embodiment, circulation heat dissipation mechanism is including setting up vertical bevel gear, the vertical bevel gear inner wall connection's that corresponds below horizontal bevel gear auxiliary rod that has a speed sensor, the periphery of auxiliary rod is connected with a plurality of driven fan blades and the round gear of auxiliary rod both ends connection with the gear and gear chain adaptation of empty sleeve.
In a further embodiment, the circulating heat dissipation mechanism further comprises a plurality of connecting bearing seats connected to the periphery of the auxiliary rod, and a connecting rod connected between the connecting bearing seats and the protection box.
In a further embodiment, the buffering support mechanism comprises a support frame connected with the protection box, a connecting frame arranged above the support frame and used for connection, a plurality of limiting rods connected with the top end of the support frame, a plurality of hollow tubes matched with the limiting rods and connected with the bottom end of the connecting frame, and a pressure spring connected between the limiting rods and the connecting frame and used for providing buffering.
In a further embodiment, the front end of the protection box is rotatably connected with a movable door through a hinge, and the movable door is connected with the protection box through a coded lock.
In a further embodiment, the two sides of the protection box are provided with air channels, the two air channels are arranged above the two hydraulic rotating mechanisms, and the inner walls of the air channels are connected with dust screens.
In a further embodiment, the protection box and the movable door are both composed of a waterproof layer and an insulating layer, the waterproof layer is arranged on the outer side of the insulating layer, waterproof paint is coated on the outer wall of the waterproof layer, the waterproof layer is made of ceramic with waterproof and insulating properties, and the insulating layer is made of hollow explosion-proof glass with insulating properties.
The invention has the technical effects and advantages that: according to the line impedance correction device applied to the new energy microgrid, an impedance tester can test an impedance value, a distributed power inverter can adjust and correct the impedance value, and a singlechip is intelligently controlled to ensure the consistency of all lines; the wind power rotating mechanism can utilize wind power to naturally rotate, the water conservancy rotating mechanism can utilize water liquid received by the water receiving box to naturally rotate (only when raining), the heat energy mechanism can be driven by utilizing heat energy, and three natural energies are utilized to assist the circulation heat dissipation mechanism to rotate and dissipate heat, so that energy loss caused by electricity consumption is reduced, and the vertical electric telescopic rod, the transverse electric telescopic rod and the linear motor are driven to ensure that the energy of the three cannot influence each other when in use; this be applied to line impedance correction device of new forms of energy microgrid can not only carry out the impedance correction to the circuit, can also utilize the nature can assist the heat dissipation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the protective case of the present invention with the movable door open;
FIG. 3 is an enlarged view of the structure of FIG. 2 at A in accordance with the present invention;
FIG. 4 is a cross-sectional view of the restrictor box of the present invention;
FIG. 5 is a schematic structural diagram of a cushion support mechanism according to the present invention;
fig. 6 is a schematic structural view of the auxiliary lever of the present invention.
In the figure: the device comprises a protection box 1, an impedance tester 2, a distributed power supply inverter 3, a singlechip 4, a buffer supporting mechanism 5, a wind power rotating mechanism 6, a water receiving box 7, a water outlet pipe 8, a hydraulic rotating mechanism 9, a heat energy mechanism 10, a circulation heat dissipation mechanism 11, a rotating rod 12, a wind wheel 13, a transverse bevel gear 14, a driving fan blade 15, a rotating rod 16, a water wheel 17, an empty gear 18, a limiting box 19, an air bag 20, a top plate 21, a gear chain 22, a vertical bevel gear 23, an auxiliary rod 24, a driven fan blade 25, a circular gear 26, a connecting rod 27, a supporting frame 28, a connecting frame 29, a limiting rod 30, a hollow pipe 31 and a movable door 32.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
In order to correct the line impedance, referring to fig. 2, the system comprises a protection box 1 with a protection function, an impedance tester 2 used for testing the micro-grid circuit in the protection box 1, a distributed power inverter 3 used for adjusting the micro-grid circuit, and a single chip microcomputer 4 used for intelligent control (the single chip microcomputer 4 is electrically connected with each instrument and performs advanced coding control).
In order to utilize three natural energies to carry out auxiliary heat dissipation, the inner wall of the protection box 1 is connected with a buffer support mechanism 5 for supporting and fixing, the top end of the protection box 1 is connected with a wind power rotating mechanism 6 utilizing wind power, the top end of the protection box 1 is connected with two water receiving boxes 7 symmetrically arranged and connected with liquid level sensors in a welding way, the bottom end of the water receiving box 7 is communicated with a water outlet pipe 8 with an electromagnetic valve, two sides of the protection box 1 are respectively communicated with a hydraulic rotating mechanism 9 utilizing water energy corresponding to the water outlet pipe 8, the inner wall of the protection box 1 is also connected with a heat energy mechanism 10, the inner wall of the protection box 1 is connected with a circulating heat dissipation mechanism 11 capable of being matched with the wind power rotating mechanism 6, the hydraulic rotating mechanism and the heat energy mechanism 10, the wind power rotating mechanism 6 comprises a transverse bearing seat connected with the inner wall of a circular channel arranged at the top end of the protection box 1, a wind wheel 13 (the size of the wind wheel 13 is selected as required) connected with the periphery of a rotating rod of the rotating rod 13 of the rotating rod, the rotating rod 12 is selected as required, the bottom end of the rotating rod 12 is connected with a transverse bevel gear 14 connected with a vertical electric telescopic rod and a vertical electric fan blade connected with the periphery of the vertical electric telescopic rod, the vertical electric telescopic rod 15 (the vertical electric fan blade 15) is selected as required), the active rotating rod 17, the active bevel gear 17 is also selected as the active telescopic rod 17, the size of the vertical gear 17, the vertical gear 17 is connected with the water wheel 17, the water wheel 17 is connected with the water wheel 17, ensuring to be sleeved on the periphery of the circular gear 26 and also playing a driving role) and another driving fan blade 15 connected with the periphery of the electric telescopic rod, the heat energy mechanism 10 comprises a limit box 19 which is connected with the vertical inner wall of the protection box 1 and has good heat conduction effect, an air bag 20 (the boiling point is about 30-40) which is connected with the inner cavity of the limit box 19 and is filled with boiling liquid with low boiling point, a top plate 21 which is connected with the top end of the air bag 20 and a gear chain 22 (if the stability part is insufficient, an auxiliary plate can be added) which is connected with the top plate 21 through a linear motor, other air bags of the air bag 20 with high height can be connected with the periphery of the protection box 1, the air bag is communicated with the air bag by a communicating pipe with an electromagnetic valve, after the top plate 21 is driven to move upwards, the solenoid valve can be opened to allow the gas to flow into other air bags, so that the top plate 21 moves downwards, other air bags are positioned outside the protective box 1, after the boiling liquid in the inner cavity is liquefied, the electromagnetic valve is closed, the operation is repeated, the circulating heat dissipation mechanism 11 can be continuously driven to rotate, four vertical inner walls of the limit box 19 are all provided with slide rails, four side surfaces of the top plate 21 are all connected with slide blocks which are in slide connection with the slide rails, the circulating heat dissipation mechanism 11 comprises a vertical conical gear 23 arranged below the transverse conical gear 14 correspondingly, an auxiliary rod 24 connected with the inner wall of the vertical conical gear 23 and provided with a rotating speed sensor, a plurality of driven fan blades 25 connected with the periphery of the auxiliary rod 24, and a circular gear 26 connected with the two ends of the auxiliary rod 24 and matched with the idle gear 18 and the gear chain 22, the circulating heat dissipation mechanism 11 further includes a plurality of connecting bearing seats connected to the periphery of the auxiliary rod 24 and a connecting rod 27 connected between the connecting bearing seats and the protection box 1.
In order to buffer external force and protect instruments, the buffer supporting mechanism 5 comprises a supporting frame 28 connected with the protection box 1, a connecting frame 29 arranged above the supporting frame 28 and used for connection, a plurality of limiting rods 30 connected with the top end of the supporting frame 28, a plurality of hollow tubes 31 connected with the bottom end of the connecting frame 29 and adapted with the limiting rods 30, and pressure springs connected between the limiting rods 30 and the connecting frame 29 and used for providing buffer, so that the effect of buffering external force is achieved, the supporting effect is also achieved, and the circulation effect of air is ensured.
Guarantee insulating nature, the front end of guard box 1 is connected with dodge gate 32 through the hinge rotation, and dodge gate 32 passes through the trick lock and is connected with guard box 1, the passageway of ventilating has all been seted up to guard box 1's both sides, and two passageways of ventilating all set up in the top of two water conservancy slewing mechanism 9, and the inner wall connection of the passageway of ventilating has the dust screen, guard box 1 and dodge gate 32 constitute by waterproof layer and insulating layer, the waterproof layer sets up the outside at the insulating layer, the outer wall coating of waterproof layer has waterproof coating, the material of waterproof layer sets up to the pottery that has waterproof and insulating properties, the insulating layer sets up to the hollow explosion-proof glass that has insulating properties, plays insulating protection's effect, anti high pressure explosion-proof.
The working principle of the line impedance correction device applied to the new energy microgrid is that when an external wind force blows a wind wheel 13 to rotate, a driving fan blade 15 and a transverse bevel gear 14 can be indirectly driven to rotate, a vertical electric telescopic rod is controlled to extend, the transverse bevel gear 14 is meshed with a longitudinal bevel gear 23, a driven fan blade 25 of a circulation heat dissipation mechanism 11 is indirectly driven to rotate, the driving fan blade 15 is matched with the driven fan blade 25, air in a protection box 1 can be assisted to circulate, so that auxiliary heat dissipation is performed, in normal weather, a water receiving box 7 plays a role in shielding protection, in rainy weather, the water receiving box 7 can collect water, when the liquid level reaches a specified position, the transverse electric telescopic rod extends, an idler gear 18 is meshed with a circular gear 26, an electromagnetic valve is opened, a water outlet pipe 8 discharges water, downward flow of the water liquid drives the fan blade 17 to rotate, the driving fan blade 15 and the circulation heat dissipation mechanism 11 to rotate, so that auxiliary heat dissipation is performed, when instruments in the protection box 1 work overload, the temperature in the protection box 1 becomes too high, boiling point of a boiling liquid reaches, a top plate 21 and a chain 22 are pushed up, so that the auxiliary heat dissipation mechanism 11 rotates, and the auxiliary heat dissipation mechanism is further realized.
Finally, it should be noted that: the foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention.
Claims (5)
1. The utility model provides a be applied to line impedance orthotic devices of new forms of energy microgrid, be used for impedance tester (2) to microgrid test line in guard box (1) and guard box (1) that have protect function, be used for to distributed power inverter (3) of microgrid regulating circuit and be used for intelligent control's singlechip (4), its characterized in that:
the inner wall of the protection box (1) is connected with a buffering supporting mechanism (5) for supporting and fixing, the top end of the protection box (1) is connected with a wind power rotating mechanism (6) utilizing wind power, the top end of the protection box (1) is connected with two symmetrically arranged water receiving boxes (7) of which the inner walls are connected with liquid level sensors, the bottom ends of the water receiving boxes (7) are communicated with a water outlet pipe (8) with an electromagnetic valve, two sides of the protection box (1) are respectively communicated with hydraulic rotating mechanisms (9) utilizing water power and corresponding to the water outlet pipe (8), the inner wall of the protection box (1) is also connected with a heat energy mechanism (10), and the inner wall of the protection box (1) is connected with a circulating heat dissipation mechanism (11) capable of being matched with the wind power rotating mechanism (6), the hydraulic rotating mechanism and the heat energy mechanism (10); the circulating heat dissipation mechanism (11) comprises a vertical conical gear (23) correspondingly arranged below the transverse conical gear (14), an auxiliary rod (24) which is connected with the inner wall of the vertical conical gear (23) and is provided with a rotating speed sensor, a plurality of driven fan blades (25) are connected to the periphery of the auxiliary rod (24), and a circular gear (26) which is connected with the two ends of the auxiliary rod (24) and is matched with the idle gear (18) and the gear chain (22); the wind power rotating mechanism (6) comprises a transverse bearing seat connected with the inner wall of a circular channel formed at the top end of the protection box (1), a rotating rod (12) connected with the inner wall of the transverse bearing seat, a wind wheel (13) connected with the periphery of the upper half part of the rotating rod (12), a transverse conical gear (14) connected with the bottom end of the rotating rod (12) through a vertical electric telescopic rod, and an active fan blade (15) connected with the periphery of the vertical electric telescopic rod; the hydraulic rotating mechanism (9) comprises a vertical bearing seat connected with the inner wall of a circular channel formed in the side surface of the protection box (1), a rotating rod (16) connected with the inner wall of the vertical bearing seat, a water wheel (17) of the rotating rod (16) arranged on the periphery of the end part of one side of the protection box (1) and connected with the outer periphery of the protection box, an idler gear (18) connected with one end of the rotating rod (12) through a transverse electric telescopic rod and another driving fan blade (15) connected with the outer periphery of the electric telescopic rod; the heat energy mechanism (10) comprises a limiting box (19) which is connected to the vertical inner wall of the protection box (1) and has a good heat conduction effect, an air bag (20) which is connected in the limiting box (19) and is provided with boiling liquid with a low boiling point in an inner cavity, a top plate (21) which is connected with the top end of the air bag (20) and a gear chain (22) which is connected with the top plate (21) through a linear motor, slide rails are arranged on the four vertical inner walls of the limiting box (19) in a connected mode, and slide blocks which are connected with the slide rails in a sliding mode are connected to the four side faces of the top plate (21); circulation heat dissipation mechanism (11) still include connect a plurality of connection bearing frame and connection connecting rod (27) of being connected between connection bearing frame and guard box (1) in auxiliary rod (24) periphery.
2. The line impedance correction device applied to the new energy microgrid according to claim 1, characterized in that: the buffer supporting mechanism (5) comprises a supporting frame (28) connected with the protection box (1), a connecting frame (29) arranged above the supporting frame (28) and used for connection, a plurality of limiting rods (30) connected with the top end of the supporting frame (28), a plurality of hollow tubes (31) matched with the limiting rods (30) and connected with the bottom end of the connecting frame (29) and pressure springs which are connected between the limiting rods (30) and the connecting frame (29) and used for providing buffer.
3. The line impedance correction device applied to the new energy microgrid according to claim 1, characterized in that: the front end of the protection box (1) is rotatably connected with a movable door (32) through a hinge, and the movable door (32) is connected with the protection box (1) through a coded lock.
4. The line impedance correction device applied to the new energy microgrid according to claim 1, characterized in that: ventilating channels are formed in the two sides of the protection box (1), the two ventilating channels are arranged above the two hydraulic rotating mechanisms (9), and the inner walls of the ventilating channels are connected with dust screens.
5. The line impedance correction device applied to the new energy microgrid according to claim 3, characterized in that: the protection box (1) and the movable door (32) are composed of a waterproof layer and an insulating layer, the waterproof layer is arranged on the outer side of the insulating layer, waterproof paint is coated on the outer wall of the waterproof layer, the waterproof layer is made of ceramic with waterproof and insulating properties, and the insulating layer is made of hollow explosion-proof glass with insulating properties.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110729063.0A CN113517689B (en) | 2021-06-29 | 2021-06-29 | Be applied to line impedance orthotic devices of new forms of energy microgrid |
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| CN202110729063.0A CN113517689B (en) | 2021-06-29 | 2021-06-29 | Be applied to line impedance orthotic devices of new forms of energy microgrid |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211478462U (en) * | 2019-12-30 | 2020-09-11 | 巴测电气(上海)有限公司 | Online monitor for power grid impedance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102012015171B3 (en) * | 2012-08-02 | 2013-06-13 | Dennis Patrick Steel | Highly efficient wind energy system installed in e.g. building roof, has radiator that is provided in cooling water circuit and arranged at side facing wind distributor, and circulating pump that is directly connected with wind turbine |
| CN208638260U (en) * | 2018-08-02 | 2019-03-22 | 华能包头风力发电有限公司 | A kind of cooling system of inverter |
| CN109861284B (en) * | 2019-02-28 | 2019-12-24 | 华北电力大学 | Line impedance correction device of new forms of energy microgrid |
| CN212812554U (en) * | 2020-10-21 | 2021-03-26 | 深圳市金鑫源五金制品有限公司 | External hanging type cabinet heat dissipation device |
| CN112285853B (en) * | 2020-10-29 | 2022-06-24 | 重庆特发信息光缆有限公司 | Ventilation heat dissipation type optical cable divides fine case |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211478462U (en) * | 2019-12-30 | 2020-09-11 | 巴测电气(上海)有限公司 | Online monitor for power grid impedance |
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