CN110571698A - Ring main unit based on high-voltage measurement - Google Patents
Ring main unit based on high-voltage measurement Download PDFInfo
- Publication number
- CN110571698A CN110571698A CN201910977330.9A CN201910977330A CN110571698A CN 110571698 A CN110571698 A CN 110571698A CN 201910977330 A CN201910977330 A CN 201910977330A CN 110571698 A CN110571698 A CN 110571698A
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- Prior art keywords
- bin
- input line
- cable
- side wall
- door
- Prior art date
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- 238000005259 measurement Methods 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
Classifications
-
- 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
- H02B1/015—Boards, panels, desks; Parts thereof or accessories therefor
- H02B1/03—Boards, panels, desks; Parts thereof or accessories therefor for energy meters
-
- 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
- H02B1/015—Boards, panels, desks; Parts thereof or accessories therefor
- H02B1/04—Mounting thereon of switches or of other devices in general, the switch or device having, or being without, casing
-
- 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
- H02B13/005—Electrical connection between switchgear cells
-
- 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
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a high-voltage measurement-based ring main unit, which comprises a cabinet body, wherein a cavity and a cable bin are formed in the cabinet body, the side wall of the cavity is rotatably connected with a cabinet door, and the side wall of the cable bin is rotatably connected with a bin door; the mounting plate is fixed inside the cavity, and an electric element is fixed on the mounting plate; the upper end and the lower end of the electric element are respectively connected with an input line and an output line, and the end part of each input line and each output line penetrates through the cable bin and extends out of the cabinet body to be connected with an external conductive circuit in series; wherein, the input line that is located inside the cable chamber links to each other with safety mechanism, and the safety mechanism end links to each other with voltage sensor. The invention has simple structure, reasonable layout, convenient operation, safety and reliability, and the safety mechanism is arranged between the voltage sensor and the input line, so that when the internal short circuit and other extreme conditions occur, the voltage sensor and the input line are disconnected by the safety mechanism, the normal operation of the line is not influenced, and the safety and the reliability of the operation in a high-voltage environment are ensured.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a ring main unit based on high-voltage measurement.
Background
With the continuous development of society, the urban power grid' cable is the mainstream, 10 kilovolt lines of a power distribution network are deep into a load center, and an outdoor ring main unit is also widely applied, wherein electrical elements are located in the outdoor ring main unit.
At present, 10KV electrical elements of an urban power distribution network gradually realize bidirectional metering, which means that a metering device needs to be added in a ring main unit. At this time, if the measurement points are added to the ring main unit according to the traditional high-voltage measurement scheme, the problems of narrow space of the ring main unit and incapability of installing a voltage sensor are faced; if a high-voltage metering box (cabinet) is additionally built, the problems of occupied area approval, civil engineering, complex environmental evaluation process, long construction period and high construction cost are faced. Therefore, in order to avoid the above problems, a new ring main unit based on high voltage measurement is urgently needed to be developed for ensuring the safety and reliability of operation in high voltage environment (i.e. when the extreme conditions such as internal short circuit occur, the detection device can be ensured to be cut off from the power grid without affecting the normal operation of the line).
Disclosure of Invention
the technical problem to be solved by the invention is to provide a ring main unit based on high-voltage measurement, which has the advantages of simple structure, reasonable spatial layout, convenience in operation, safety and reliability.
The invention adopts the following technical scheme to solve the technical problems:
a ring main unit based on high-voltage measurement comprises a cabinet body, wherein a cavity and a cable bin are formed in the cabinet body, a cabinet door is rotatably connected to the side wall of the cavity, and a bin door is rotatably connected to the side wall of the cable bin;
The interior of the cavity is fixedly connected with an installation plate, and an electric element is fixed on the installation plate; the upper end and the lower end of the electric element are respectively connected with a plurality of input lines and output lines, and the end parts of the input lines and the output lines extend towards the direction of the cable bin to penetrate into the cable bin, finally extend to the outside of the cabinet body and are connected with external conductive circuits in series; the input line positioned in the cable bin is particularly connected with safety mechanisms arranged on the inner side wall of the bin door, and the tail end of each safety mechanism is connected with a voltage sensor fixed on the outer side wall of the bin door; and a signal output joint is arranged on the voltage sensor.
As one of the preferable modes of the invention, the safety mechanism comprises a bottom plate, wherein both ends of the bottom plate are fixedly connected with insulating blocks, any insulating block is fixedly connected with a corresponding input line through a clamping block, and a high-voltage fuse is fixedly connected between the two insulating blocks; conductors are further arranged inside the two insulation blocks respectively, and two ends of the high-voltage fuse are electrically connected with the corresponding input line and the voltage sensor through the conductors respectively.
in a preferred embodiment of the present invention, a peeling process is performed on an outer periphery of the input line between the insulating block and the clamping block to form a peeled portion.
As one of the preferable modes of the invention, a plurality of wire clamps are movably clamped on the outer side walls of the input line and the output line, and the inner end of each wire clamp is movably clamped inside the clamping groove; the clamping grooves are arranged on the side wall of the mounting plate in an array mode.
as one preferable mode of the present invention, an observation window and a heat dissipation barrier are provided on a side wall of the cabinet door.
As one of the preferable modes of the invention, the middle part of the cable bin is also provided with a clapboard; the cable bin is divided into an upper accommodating bin and a lower accommodating bin by the partition board, and the input line and the output line are respectively accommodated in the upper accommodating bin and the lower accommodating bin.
Compared with the prior art, the invention has the advantages that: the voltage measuring device is simple in structure and reasonable in spatial layout, the voltage sensors are fixedly arranged on the outer side wall of the bin door, a cabinet body is not required to be additionally arranged, the application cost is saved, the high-voltage end of each voltage sensor is respectively electrically connected with the input line, an external electric energy meter is directly connected with the voltage sensors when the voltage is measured, a plug-in connector is not required to be arranged inside the cabinet body, and the measuring operation is facilitated; meanwhile, the safety mechanism is arranged between the voltage sensor and the input line, when the internal short circuit and other extreme conditions occur, the voltage sensor and the input line are disconnected through the safety mechanism, the normal operation of a line is not influenced, and the safety and the reliability of the device in the operation process in a high-voltage environment can be effectively guaranteed.
Drawings
Fig. 1 is an overall structural schematic diagram of a ring main unit based on high voltage measurement in an embodiment 1 when a cabinet door and a cabin door are closed;
Fig. 2 is a schematic view of an overall structure of the ring main unit in an open state of a cabinet door and a compartment door based on high voltage measurement in embodiment 1;
FIG. 3 is a schematic view showing the structure of input lines, output lines and electric elements in embodiment 1;
FIG. 4 is an enlarged view at A of FIG. 1;
FIG. 5 is a sectional view of the safety mechanism and the input line in embodiment 1;
FIG. 6 is a sectional view of the voltage sensor, the high-voltage fuse and the input line in embodiment 1;
FIG. 7 is an enlarged view at B of FIG. 6;
FIG. 8 is an enlarged view at C of FIG. 6;
FIG. 9 is a schematic view of the structure of an input line, an output line, a cable compartment and a partition in example 1;
FIG. 10 is a schematic structural view of a wire clamp and a clamping groove in example 1;
Fig. 11 is a schematic view of the structure of the voltage sensor, the high-voltage fuse, and the input line in embodiment 1.
In the figure: 1 is the cabinet body, 2 is the cavity, 3 is the cable compartment, 4 is the cabinet door, 5 is the door in the storehouse, 6 is the mounting panel, 7 is the input line, 701 is the department of skinning, 8 is the output line, 9 is safety mechanism, 901 is the bottom plate, 902 is the insulating block, 903 is high-voltage fuse, 904 is the conductor, 905 is the clamp splice, 10 is voltage sensor, 11 is signal output joint, 12 is electrical component, 13 is the observation window, 14 is the heat dissipation barrier, 15 is the fastener, 16 is the draw-in groove, 17 is the baffle.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
as shown in fig. 1-11, the ring main unit based on high voltage measurement of this embodiment includes a cabinet body 1, a cavity 2 and a cable compartment 3 are opened inside the cabinet body 1, a cabinet door 4 is rotatably connected to a side wall of the cavity 2, and a compartment door 5 is rotatably connected to a side wall of the cable compartment 3.
referring to fig. 2 and 3, an installation plate 6 is fixedly connected inside the cavity 2, and an electrical component 12 is fixed on the installation plate 6 through a bolt; the upper end and the lower end of the electric element 12 are respectively connected with a plurality of input lines 7 and output lines 8, a circuit on the input line 7 flows into the electric element 12, and then current flows to the output lines 8 from the electric element 12; and, the tip of every input line 7 and output line 8 all extends to penetrating in cable storehouse 3 towards cable storehouse 3 direction to finally extend to the cabinet body 1 outside, and be established ties with outside conducting wire. The upper end and the lower end of the electrical element 12 are provided with jacks for connecting the input line 7 and the output line 8, when the ends of the input line 7 and the output line 8 are inserted into the jacks, the ends of the input line 7 and the output line 8 are pressed in the jacks through screws arranged on the electrical element 12 to be fixed, and then the electrical element 12 is connected in series with the output line 8 through the input line 7 in a corresponding circuit.
In addition, referring to fig. 2, 3 and 4, the input lines 7 located inside the cable compartment 3 are specifically connected to the safety mechanisms 9 installed on the inner side walls of the compartment door 5, each input line 7 is connected to each safety mechanism 9 in a one-to-one correspondence, and the tail end of each safety mechanism 9 is electrically connected to the voltage sensor 10 fixed on the outer side wall of the compartment door 5, where the safety mechanisms 9 are used for ensuring the safety and reliability of the voltage sensor 10 in operation in a high-voltage environment. Wherein, voltage sensor 10 can be for capacitive voltage divider and resistive voltage divider, and inside adoption ageing-resistant insulating potting material fills, and the one end that voltage sensor 10 and safety gear 9 are connected is the high-pressure incoming end, just be equipped with signal output joint 11 on the voltage sensor 10, voltage sensor 10 can carry out signal connection with outside electric energy meter through signal output joint 11, then makes the device when measuring, only needs simple with outside electric energy meter connecting wire insert on signal output joint 11, can begin to detect, signal output joint 11 is the secondary low pressure and draws forth the signal end, and the voltage of production is less.
further, referring to fig. 2, fig. 3, fig. 5, fig. 6, fig. 7, and fig. 11, in the present embodiment, the safety mechanism 9 specifically includes a bottom plate 901, an insulating block 902, a high-voltage fuse 903, a conductor 904, and a clamping block 905; the bottom plate 901 is fixed on the inner side wall of the bin gate 5, two ends of the bottom plate 901 are fixedly connected with insulating blocks 902, any insulating block 902 is fixedly connected with a corresponding input line 7 through a clamping block 905, and a high-voltage fuse 903 is fixedly connected between the two insulating blocks 902; conductors 904 are further arranged inside the two insulating blocks 902, and two ends of the high-voltage fuse 903 are electrically connected with the corresponding input line 7 and the voltage sensor 10 through the conductors 904; when the internal short circuit and other extreme conditions occur, the high-voltage fuse 903 can disconnect the detection circuit from the input line 7, so that the safety and reliability of the operation of the voltage sensor 10 in a high-voltage environment are guaranteed, the detection device is cut off from a power grid, and the normal operation of a line is not influenced.
Further, in this embodiment, the structure of the high-voltage fuse 903 specifically includes a fuse tube, a contact conductive portion, and the like, the fuse tube is filled with quartz sand fine particles for arc extinction, and the fuse element is a metal wire or a metal sheet made of a metal material with a lower melting point and is connected in series in a protected circuit; when the circuit or equipment in the circuit is overloaded or fails, the melting piece heats and melts, so that the circuit is cut off, and the purpose of protecting the circuit or the equipment is achieved; the high-voltage fuse 903 has a publicly used technical scheme at present, and the structure and principle of the high-voltage fuse 903 are not the technical features of the present invention, so that details are not described, for example, the high-voltage fuse 903 is in a model of XRNT 1-12/200.
Further, referring to fig. 5, fig. 6 and fig. 8, in the present embodiment, a peeling process is performed on the input line 7 between the insulation block 902 and the clamp block 905 to form a peeling part 701; here, the peeling part 701 of the input line 7 exposes the conductive copper wire of the input line 7 to the outside, and then after being clamped by the clamping block 905, the conductive copper wire of the peeling part 701 of the input line 7 directly contacts with the conductor 904, so that the electrical connection is realized. Furthermore, a wire groove is formed between the insulating block 902 and the clamping block 905, and the diameter of the wire groove is smaller than that of the peeling part 701 of the input wire 7, so that the input wire 7 can be clamped more firmly by the insulating block 902 and the clamping block 905.
Further, referring to fig. 2 and 10, in the present embodiment, a plurality of wire clamps 15 are movably clamped on outer sidewalls of the input line 7 and the output line 8, and an inner end of each wire clamp 15 is movably clamped inside the clamping groove 16; the clamping grooves 16 are arranged on the side wall of the mounting plate 6 in an array mode. The number of the wire clamps 15 can be properly increased according to the lengths of the input wires 7 and the output wires 8 in the cavity 2, so that the arrangement of the input wires 7 and the output wires 8 is clear and not disordered, and the cleanness of the inside of the cavity 2 is kept.
Further, referring to fig. 1, in the present embodiment, an observation window 13 and a heat dissipation barrier 14 are disposed on a side wall of the cabinet door 4. Wherein, the observation window 13 is convenient for observing the working condition of the electric element 12 in the cavity 2; the heat dissipation barrier 14 facilitates the heat generated by the electric components 12 inside the cavity 2 during operation to be dissipated.
Further, referring to fig. 2 and 9, in the present embodiment, a partition 17 is further installed in the middle of the cable compartment 3; the cable bin 3 is divided into an upper accommodating bin and a lower accommodating bin by a partition plate 17, an input line 7 is accommodated in the upper accommodating bin, and an output line 8 is accommodated in the lower accommodating bin; this baffle 17 can be separated the input line 7 that is located inside cable chamber 3 with output line 8, makes the quick judgement kind of circuit of managers then, the management of the circuit of being convenient for.
in addition, as shown in fig. 1, in the embodiment, handles (not labeled) are further respectively disposed on the cabinet door 4 and the bin door 5, and the cabinet door 4 and the bin door 5 can be opened to the state shown in fig. 2 by pulling the handles; because the device is high-voltage electrical device, in order to ensure public safety, the department of opening and shutting of cabinet door 4 and door 5 can be equipped with mechanical lock (not marking in the figure), makes cabinet door 4 and door 5 then dead by the lock when closed, prevents that cabinet door 4 and door 5 from opening wantonly, endangering public safety.
The working principle is as follows: when the cable bin is installed, the electric element 12 is fixedly installed on the installation plate 6, the input line 7 and the output line 8 in the cable bin 3 are pulled into the cavity 2 and connected to the electric element 12; then, peeling off a proper position of the input line 7 in the cable chamber 3, electrically connecting the peeled part 701 of the input line 7 with the safety mechanism 9, and electrically connecting the other end of the safety mechanism 9 with the voltage sensor 10; at the moment, after the electric element 12 is opened and electrified, the normal operation of the device can be realized by closing the bin door 5 and the cabinet door 4; during high-voltage detection, detection can be started only by simply inserting an external electric energy meter connecting wire into the signal output connector 11; when the internal short circuit and other extreme conditions occur, the pressure sensor 10 and the input line 7 are disconnected through the safety mechanism 9, and the safety and the reliability of operation in a high-voltage environment are guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The ring main unit based on high-voltage measurement is characterized by comprising a main body (1), wherein a cavity (2) and a cable bin (3) are formed in the main body (1), the side wall of the cavity (2) is rotatably connected with a cabinet door (4), and the side wall of the cable bin (3) is rotatably connected with a bin door (5);
an installation plate (6) is fixedly connected inside the cavity (2), and an electric element (12) is fixed on the installation plate (6); the upper end and the lower end of the electric element (12) are respectively connected with a plurality of input lines (7) and output lines (8), the end parts of the input lines (7) and the output lines (8) extend towards the direction of the cable bin (3) to penetrate into the cable bin (3), finally extend to the outside of the cabinet body (1), and are connected with external conductive circuits in series; the input line (7) positioned in the cable bin (3) is particularly connected with safety mechanisms (9) arranged on the inner side wall of a bin door (5), and the tail end of each safety mechanism (9) is connected with a voltage sensor (10) fixed on the outer side wall of the bin door (5); and a signal output joint (11) is arranged on the voltage sensor (10).
2. the looped network cabinet based on high voltage measurement according to claim 1, wherein the safety mechanism (9) comprises a bottom plate (901), two ends of the bottom plate (901) are fixedly connected with insulating blocks (902), any insulating block (902) is fixedly connected with a corresponding input line (7) through a clamping block (905), and a high voltage fuse (903) is fixedly connected between the two insulating blocks (902); conductors (904) are further arranged inside the two insulation blocks (902), and two ends of the high-voltage fuse (903) are electrically connected with the corresponding input line (7) and the voltage sensor (10) through the conductors (904) respectively.
3. The looped network cabinet based on high voltage measurement according to claim 2, wherein a peeling part (701) is provided at the periphery of the input line (7) between the insulation block (902) and the clamping block (905).
4. The looped network cabinet based on high voltage measurement according to claim 1, wherein a plurality of wire clamps (15) are movably clamped on outer sidewalls of the input line (7) and the output line (8), and an inner end of each wire clamp (15) is movably clamped inside the clamping groove (16); the clamping grooves (16) are arranged on the side wall of the mounting plate (6) in an array arrangement mode.
5. The looped network cabinet based on high voltage measurement according to claim 1, wherein the side wall of the cabinet door (4) is provided with an observation window (13) and a heat dissipation grille (14).
6. the ring main unit based on high voltage measurement according to claim 1, wherein a partition plate (17) is further installed in the middle of the cable compartment (3); the cable bin (3) is divided into an upper containing bin and a lower containing bin by the partition plate (17), and the input line (7) and the output line (8) are contained in the upper containing bin and the lower containing bin respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977330.9A CN110571698B (en) | 2019-10-15 | 2019-10-15 | Ring main unit based on high-voltage measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977330.9A CN110571698B (en) | 2019-10-15 | 2019-10-15 | Ring main unit based on high-voltage measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110571698A true CN110571698A (en) | 2019-12-13 |
| CN110571698B CN110571698B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910977330.9A Active CN110571698B (en) | 2019-10-15 | 2019-10-15 | Ring main unit based on high-voltage measurement |
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| CN (1) | CN110571698B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082321A (en) * | 2019-12-31 | 2020-04-28 | 安徽明诚电力设备安装有限公司 | Safe ring main unit |
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| KR101830843B1 (en) * | 2017-03-23 | 2018-02-21 | 임현배 | An electric power fuse of distribution board |
| CN107947127A (en) * | 2017-12-23 | 2018-04-20 | 珠海浩云电气有限公司 | A kind of power distribution cabinet temperature protection system |
| CN108879400A (en) * | 2018-07-26 | 2018-11-23 | 许继集团有限公司 | A kind of exchange header box |
| CN209267882U (en) * | 2018-09-15 | 2019-08-16 | 电管家电器(上海)有限公司 | One kind is novel can convenient for wiring electrical complete cabinet |
| CN210490246U (en) * | 2019-10-15 | 2020-05-08 | 国网安徽省电力有限公司阜阳供电公司 | Ring main unit based on high-voltage measurement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082321A (en) * | 2019-12-31 | 2020-04-28 | 安徽明诚电力设备安装有限公司 | Safe ring main unit |
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| CN110571698B (en) | 2024-03-19 |
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