CN113794130A - DC system expansion device - Google Patents
DC system expansion device Download PDFInfo
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- CN113794130A CN113794130A CN202111048678.3A CN202111048678A CN113794130A CN 113794130 A CN113794130 A CN 113794130A CN 202111048678 A CN202111048678 A CN 202111048678A CN 113794130 A CN113794130 A CN 113794130A
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- air switch
- box body
- direct current
- middle frame
- row
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- 239000011810 insulating material Substances 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- H02B1/52—Mobile units, e.g. for work sites
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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
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
-
- 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
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
-
- 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
-
- 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
- H02B1/48—Mounting of devices therein
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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
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Patch Boards (AREA)
Abstract
The invention discloses a direct current system expanding device which comprises a box body, air switch groups, indicator lamp groups and an input power supply, wherein the box body is provided with wire inlet holes, the box body is provided with a plurality of rows of air switch groups at intervals, each row of air switch group comprises a plurality of air switches, the box body is provided with a plurality of rows of indicator lamp groups at intervals, each row of indicator lamp group comprises a plurality of indicator lamps, the indicator lamps of each row of indicator lamp group are correspondingly connected with the air switches of each row of air switch group one by one, the input power supply is a direct current power supply provided for standby air switches in a direct current system, the standby air switches are provided in a plurality, each row of air switch groups is connected with one standby air switch through a power wire, and the power wire penetrates through the wire inlet holes. The direct current system expansion device can solve the problem of insufficient standby air switch in the early stage of comprehensive transformation, and is small in size, convenient to carry, safe and reliable.
Description
Technical Field
The invention relates to the technical field of electrical devices, in particular to a direct current system expansion device.
Background
The direct current system is an independent power supply, is a power supply source of equipment such as total station protection, measurement and control and the like, is not influenced by a generator, station service power and a system operation mode, and ensures that a backup power supply (storage battery) continuously provides important equipment of the direct current power supply under the condition of external alternating current interruption. Normally, a direct current system of a 110kV transformer substation is configured in a double-charging double-feeding mode, namely two charging screens and two corresponding feeder screens are arranged. Wherein, 48-54 direct current loops are usually configured in one feeder screen, and 4-6 spare air switches are left after production operation.
In the early stage of comprehensive transformation, because the direct current power supply of old equipment cannot exit, the new equipment needs to be connected with the direct current power supply, such as a public measurement and control screen, a switch screen, a telecontrol screen and the like, at least 16-20 new loops are needed, and the total standby space opening of two feeder line screens in a direct current system is 8-12, so that the requirement of the new equipment cannot be met, the difficulty of comprehensive transformation is increased, and the construction progress is influenced.
The above problems are generally solved by the following two methods:
1. the direct current power supplies are used in parallel, one direct current power supply is connected into a plurality of devices, and the devices are disconnected after idle standby air switch exists in the later stage of comprehensive transformation; the method is easy to cause the condition of overload tripping, the tripping has larger influence on equipment, more temporary cables are used, and the later recovery difficulty is larger;
2. newly adding spare air switches in the feeder screen; and not all feeder screens can be newly added with spare air switches, and the requirement on the field is higher, and the cooperation of manufacturers is needed, so that the realization is troublesome.
Disclosure of Invention
The embodiment of the invention aims to: the direct current system expansion device is simple in structure, safe and reliable, and can solve the problem of insufficient standby air switch.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
the utility model provides a direct current system extension device, includes box, air switch group, pilot lamp group and input power supply, the box is equipped with the entrance hole, the box interval is provided with the multirow air switch group, and each row air switch group includes a plurality of air switch, the box interval is provided with the multirow pilot lamp group, and each row pilot lamp group includes a plurality of pilot lamps, and each row pilot lamp group pilot lamp and each row air switch group the air switch one-to-one is connected, input power supply is the direct current power supply that reserve air switch provided in the direct current system, reserve air switch has a plurality ofly, and each row air switch group passes through the power cord and one reserve air switch is connected, the power cord passes the entrance hole.
As a preferable scheme of the direct current system expansion device, the box body comprises a front cover, a middle frame and a rear cover, openings are arranged on the front side and the rear side of the middle frame, the front cover and the rear cover respectively block the two openings, and the front cover and the rear cover are detachably connected with the middle frame through screws.
As an optimal scheme of the direct current system expansion device, a plurality of wire grooves are formed in the box body along the vertical direction, a plurality of connecting plates are arranged on the left side surface and the right side surface of the middle frame along the width direction of the box body, the connecting plates are fixed on the middle frame through screws, and the wire grooves are fixedly connected with the connecting plates through screws.
As a preferable embodiment of the dc system expansion device, a plurality of first mounting plates and a plurality of second mounting plates are disposed at intervals along a length direction in the box body, the air switch group is mounted on the first mounting plates, the indicator light group is mounted on the second mounting plates, the first mounting plates and the second mounting plates are fixed on the wire casing by screws, the front cover is provided with a plurality of first openings corresponding to the air switch group and the indicator light group, and the air switch group and the indicator light group pass through the first openings and are partially exposed outside the box body.
As a preferable scheme of the dc system expansion device, an overcurrent protection device is arranged on the box body, a second opening is formed in the front cover corresponding to the overcurrent protection device, and the overcurrent protection device penetrates through the second opening and is partially exposed out of the front cover.
As a preferable scheme of the dc system expansion device, a remote control device is disposed in the box body, and the remote control device is connected between the input power supply and the air switch group through the power line.
As a preferable scheme of the dc system expansion device, a third mounting plate and a terminal strip are arranged on two inner side surfaces of the left side and the right side of the box body in the vertical direction, the third mounting plate is fixed on the connecting plate through screws, and the terminal strip is fixed on the third mounting plate through screws.
As a preferable scheme of the direct current system expansion device, a plurality of louver holes and baffles are arranged on the left side surface and the right side surface of the box body, and the baffles are positioned above the louver holes and used for blocking rainwater.
As a preferable scheme of the direct current system expansion device, a handle is arranged at the top of the middle frame, the handle can be freely stretched and contracted to adjust the height, the handle is made of an insulating material, and the handle is fixed on the middle frame through screws.
As a preferable scheme of the direct current system expansion device, a universal wheel is arranged at the bottom of the middle frame, the universal wheel is made of an insulating material, and the universal wheel is fixed on the middle frame through screws.
The embodiment of the invention has the beneficial effects that: with reserve empty switch as DC system extension device's input power supply in the DC system, and a reserve empty switch is as a set of air switch group's input power supply, multiunit input power supply mutual isolation stops the production of direct current looped netowrk, can improve the reliability and the security of power supply, can expand a plurality of reserve empty switches simultaneously and satisfy a plurality of return circuits demands of comprehensive transformation early stage.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a dc system expansion device according to an embodiment of the present invention.
Fig. 2 is a partial front view of a dc system expansion device according to an embodiment of the present invention.
Fig. 3 is a partial right view of the dc system expansion device according to the embodiment of the present invention.
In the figure:
1. a box body; 11. a wire inlet hole; 12. a front cover; 13. a middle frame; 131. a handle; 132. a universal wheel; 14. a rear cover; 15. a first mounting plate; 16. a second mounting plate; 17. a third mounting plate; 18. a baffle plate; 2. an air switch group; 21. an air switch; 3. an indicator light set; 31. an indicator light; 4. a wire slot; 5. a connecting plate; 6. an overcurrent protection device; 61. a display screen; 62. a control button; 7. a remote control device; 8. a terminal block; 9. a louver hole; 10. a rubber sleeve.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 to 3, a dc system expansion apparatus according to an embodiment of the present invention includes a box 1, air switch groups 2, indicator light groups 3, and an input power source, where the box 1 is provided with a wire inlet 11, the box 1 is provided with a plurality of rows of air switch groups 2 at intervals, each row of air switch group 2 includes a plurality of air switches 21, the box 1 is provided with a plurality of rows of indicator light groups 3 at intervals, each row of indicator light group 3 includes a plurality of indicator lights 31, the indicator lights 31 of each row of indicator light group 3 are connected with the air switches 21 of each row of air switch group 2 in a one-to-one correspondence manner, that is, each indicator light 31 is connected with each air switch 21 individually, one indicator light 31 indicates a circuit, the input power source is a dc power source provided by a backup air switch in a dc system, the backup air switch is provided by a plurality of backup air switches, each row of air switch groups 2 is connected with one backup air switch by a power line, the power cord passes through the wire inlet hole 11. By taking the standby air switches in the direct-current system as input power supplies of the direct-current system expansion device and taking one standby air switch as an input power supply of the air switch group 2, a plurality of input power supplies are isolated from each other, the generation of a direct-current ring network is avoided, the reliability and safety of power supply can be improved, and meanwhile, a plurality of standby air switches can be expanded to meet a plurality of loop requirements in the early stage of comprehensive transformation; and a device for converting alternating current into direct current is not required to be arranged, and the volume and the occupied area of the direct current system expansion device are small.
Specifically, the wire inlet hole 11 is provided with an i-shaped rubber sleeve 10, the rubber sleeve 10 penetrates through the wire inlet hole 11, two ends of the rubber sleeve 10 are clamped on the inner side wall and the outer side wall of the box body 1 respectively, and the space of the rubber sleeve 10 only meets the requirement that a power line penetrates. Set up rubber sleeve 10 and can avoid damage electric device in getting into box 1 such as water, dust, simultaneously, the power cord leads to the insulating layer to appear damaged because of long-time friction easily 11 edges in entrance hole, and rubber sleeve 10 can play the effect of protection to the power cord.
In this embodiment, the box 1 includes a front cover 12, a middle frame 13 and a rear cover 14, the front and rear sides of the middle frame 13 are both provided with openings, the front cover 12 and the rear cover 14 block the two openings respectively, and the front cover 12 and the rear cover 14 are both detachably connected with the middle frame 13 through screws. The box body 1 is provided with the detachable front cover 12 and the detachable rear cover 14, so that the electrical devices and the wiring in the box body 1 can be conveniently dismounted or comprehensively checked.
In other embodiments, the front cover 12 and the back cover 14 can be both configured to be hinged to the middle frame 13 at one end and to be provided with a locking component at the other end, and the front cover 12 and the back cover 14 can be closed by the locking component, and the hinge assembly can be removed when needed, so that the front cover 12 and the back cover 14 can be completely removed.
In this embodiment, be equipped with a plurality of wire casings 4 along vertical direction in the box 1, two sides are provided with a plurality of connecting plates 5 along the width direction of box 1 about center 13, all are equipped with a plurality of screw holes on wire casing 4 and the connecting plate 5, and connecting plate 5 passes through the screw fixation on center 13, and wire casing 4 passes through screw and connecting plate 5 fixed connection. By arranging the connecting plate 5, the wire slot 4 can be conveniently installed, and the phenomenon that the strength of the box body 1 is influenced due to more screws on the box body 1 because the wire slot 4 is directly installed on the box body 1 is avoided, and the box body is not attractive; the arrangement of the wire groove 4 can fix the power line on the inner side wall of the box body 1, and the wire arrangement is neat.
In this embodiment, be provided with a plurality of first mounting panels 15 and a plurality of second mounting panel 16 along vertical direction interval in the box 1, air switch group 2 installs on first mounting panel 15, pilot lamp group 3 installs on second mounting panel 16, first mounting panel 15 and second mounting panel 16 all pass through the screw fixation on wire casing 4, and protecgulum 12 corresponds air switch group 2 and pilot lamp group 3 and is equipped with a plurality of first trompils (not mark in the figure), air switch group 2 and pilot lamp group 3 pass first trompil part and expose outside box 1, can observe pilot lamp 31 and carry out corresponding operation to air switch 21 in box 1 outward appearance. Through setting up first mounting panel 15 and second mounting panel 16, easy to assemble pilot lamp 31 and air switch 21, and air switch group 2 installs on a first mounting panel 15, and an pilot lamp group 3 installs on a second mounting panel 16, separates each other between pilot lamp group 3 and the air switch group 2 of different input power, avoids the wiring mistake.
In this embodiment, the box 1 is provided with the over-current protection device 6, the front cover 12 is provided with a second opening (not labeled in the figure) corresponding to the over-current protection device 6, and the over-current protection device 6 partially protrudes out of the front cover 12 through the second opening. A power line of an input power supply is connected with a current transformer of the overcurrent protection device 6, and if the current in the circuit exceeds a set alarm value, the overcurrent protection device 6 gives an alarm sound prompt.
Specifically, the overcurrent protection device 6 comprises a display screen 61 and a control button 62, and the current alarm value of the circuit can be set on the display screen 61 through the control button 62 outside the box body 1.
In the present embodiment, a remote control device 7 is provided in the housing 1, and the remote control device 7 is connected between the input power source and the air switch group 2 through a power cord. Specifically, the remote control device 7 includes a remote controller connected between the input power source and the air switch group 2 through a power line, and the on/off of a specified circuit can be controlled within a certain range by using the remote controller.
In this embodiment, two sides are provided with third mounting panel 17 and terminal row 8 along vertical direction about box 1, all are equipped with a plurality of screw holes on third mounting panel 17 and the terminal row 8, pass through the screw fixation on the third mounting panel 17 on connecting plate 5, and the terminal row 8 passes through the screw fixation on third mounting panel 17. The third mounting plate 17 is arranged to facilitate mounting of the terminal block 8; the electric device in the box body 1 is connected with the standby air switch of the direct current system through the terminal strip 8 and the power line, so that the effect of current and voltage transmission is achieved, meanwhile, the power line is tidy and attractive, and the maintenance or wiring is convenient.
In this embodiment, the left and right sides of the box body 1 are provided with a plurality of louver holes 9 and baffles 18, and the baffles 18 are located above the louver holes 9 and used for blocking rainwater. Through set up tripe hole 9 on the side of box 1, can the ventilation of dispelling the heat in the box 1, and set up tripe hole 9 and lead to the rainwater easily and damage electric device in getting into box 1, set up baffle 18 and can stop the rainwater outside box 1 in rainy day, avoid the rainwater to get into in the box 1 from tripe hole 9.
Specifically, the one end of baffle 18 articulates on box 1 lateral wall, can adjust certain angle in order to shelter from the rainwater when raining, can laminate with box 1 lateral wall when need not use baffle 18, reduces direct current system extension device's occupation space.
In this embodiment, a handle 131 is disposed on the top of the middle frame 13, the handle 131 can be freely extended and retracted to adjust the height, the handle 131 is made of an insulating material, and the handle 131 is fixed on the middle frame 13 by screws. Set up the handle 131 of adjustable length, can adjust the height that is fit for oneself according to different heights during the transport, the transport of being convenient for, handle 131 adopts insulating material to make, can guarantee user's safety in handling.
In this embodiment, the bottom of the middle frame 13 is provided with a universal wheel 132, the universal wheel 132 is made of an insulating material, and the universal wheel 132 is fixed on the middle frame 13 by screws. Through setting up universal wheel 132, it is more laborsaving convenient when the transport.
In the description herein, it is to be understood that the terms "upper" and the like are based on the orientation or positional relationship shown in the drawings, which are for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
In the description herein, references to the term "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A dc system expansion apparatus, comprising:
the box body is provided with a wire inlet hole;
the box body is provided with a plurality of rows of air switch groups at intervals, and each row of air switch group comprises a plurality of air switches;
the box body is provided with a plurality of rows of indicator lamp groups at intervals, each row of indicator lamp group comprises a plurality of indicator lamps, and the indicator lamps of each row of indicator lamp group are correspondingly connected with the air switches of each row of air switch group one by one;
the air switch group comprises a plurality of spare air switches, each row of the air switch group is connected with one spare air switch through a power line, and the power line penetrates through the wire inlet hole.
2. The direct current system expansion device of claim 1, wherein the box body comprises a front cover, a middle frame and a rear cover, openings are formed in the front side and the rear side of the middle frame, the front cover and the rear cover block the two openings respectively, and the front cover and the rear cover are detachably connected with the middle frame through screws.
3. The direct current system expansion device of claim 2, wherein a plurality of wire slots are vertically formed in the box body, a plurality of connecting plates are arranged on the left side and the right side of the middle frame along the width direction of the box body, the connecting plates are fixed on the middle frame through screws, and the wire slots are fixedly connected with the connecting plates through screws.
4. The dc system extension device of claim 3, wherein a plurality of first mounting plates and a plurality of second mounting plates are disposed at intervals along a length direction in the box, the air switch set is mounted on the first mounting plates, the indicator light set is mounted on the second mounting plates, the first mounting plates and the second mounting plates are fixed on the wire casing by screws, the front cover is provided with a plurality of first openings corresponding to the air switch set and the indicator light set, and the air switch set and the indicator light set are partially exposed outside the box through the first openings.
5. The direct current system expansion device of claim 2, wherein an overcurrent protection device is disposed on the box, a second opening is disposed on the front cover corresponding to the overcurrent protection device, and the overcurrent protection device partially protrudes out of the front cover through the second opening.
6. The dc system extension device of claim 2, wherein a remote control device is disposed within the housing, the remote control device being connected between the input power source and the air switch set via the power cord.
7. The direct current system expansion device of claim 3, wherein a third mounting plate and a terminal strip are vertically arranged on the left inner side surface and the right inner side surface of the box body, the third mounting plate is fixed on the connecting plate through screws, and the terminal strip is fixed on the third mounting plate through screws.
8. The direct current system expansion device of claim 1, wherein a plurality of louver holes and baffles are arranged on the left side surface and the right side surface of the box body, and the baffles are positioned above the louver holes and used for blocking rainwater.
9. The direct current system expansion device of claim 2, wherein a handle is arranged on the top of the middle frame, the handle can be freely stretched and contracted to adjust the height, the handle is made of an insulating material, and the handle is fixed on the middle frame through screws.
10. The direct current system expansion device of claim 2, wherein a universal wheel is arranged at the bottom of the middle frame, the universal wheel is made of an insulating material, and the universal wheel is fixed on the middle frame through screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111048678.3A CN113794130A (en) | 2021-09-08 | 2021-09-08 | DC system expansion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111048678.3A CN113794130A (en) | 2021-09-08 | 2021-09-08 | DC system expansion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113794130A true CN113794130A (en) | 2021-12-14 |
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ID=79182848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111048678.3A Pending CN113794130A (en) | 2021-09-08 | 2021-09-08 | DC system expansion device |
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| Country | Link |
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| CN (1) | CN113794130A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA752926B (en) * | 1974-05-30 | 1976-04-28 | Plessey Handel Investment Ag | A house exchange telephone system |
| CN202068089U (en) * | 2011-01-31 | 2011-12-07 | 中兴通讯股份有限公司 | Power supply distribution box |
-
2021
- 2021-09-08 CN CN202111048678.3A patent/CN113794130A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA752926B (en) * | 1974-05-30 | 1976-04-28 | Plessey Handel Investment Ag | A house exchange telephone system |
| CN202068089U (en) * | 2011-01-31 | 2011-12-07 | 中兴通讯股份有限公司 | Power supply distribution box |
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