CN112526403A - Distribution transformer monitoring terminal - Google Patents
Distribution transformer monitoring terminal Download PDFInfo
- Publication number
- CN112526403A CN112526403A CN202011124677.8A CN202011124677A CN112526403A CN 112526403 A CN112526403 A CN 112526403A CN 202011124677 A CN202011124677 A CN 202011124677A CN 112526403 A CN112526403 A CN 112526403A
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- box
- box body
- plate
- distribution transformer
- monitoring terminal
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 35
- 230000017525 heat dissipation Effects 0.000 claims abstract description 21
- 230000000712 assembly Effects 0.000 claims abstract 2
- 238000000429 assembly Methods 0.000 claims abstract 2
- 230000001681 protective effect Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009423 ventilation Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002337 anti-port Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 210000003781 tooth socket Anatomy 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0213—Venting apertures; Constructional details thereof
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
Abstract
The invention discloses a distribution transformer monitoring terminal which comprises a base, wherein a box body is fixedly arranged in the middle of the upper end of the base, a double door is movably arranged at the front end of the box body through a hinge, heat dissipation assemblies are fixedly arranged on the lower portions of the left end and the right end of the box body, a drying assembly is arranged on the upper portion of an inner cavity of the box body, supporting plates and a driving mechanism are fixedly arranged on the upper portions of the left end and the right end of the box body, a top plate is fixedly arranged at the upper ends of the two supporting plates together, a movable plate is movably arranged on the front portion of the upper end of the box body through a hinge, an axial flow fan is arranged in the base, a ventilation net communicated with the axial flow fan is fixedly arranged on the bottom wall of the. The distribution transformer monitoring terminal has the advantages of good protection effect on the distribution transformer in the terminal equipment, good heat dissipation effect and long service life.
Description
Technical Field
The invention relates to the technical field of power distribution systems, in particular to a power distribution transformer monitoring terminal.
Background
With the development of national economy and the continuous improvement of the living standard of the material culture of people, the electric power business of China is rapidly developed, the power grid is continuously expanded, and the requirements of users on the power supply quality and the power supply reliability are higher and higher, so that the power supply department is required to provide safe, economic, reliable and high-quality electric power. The modernization of the power system is a necessary trend for the development of the power industry in China, and the power distribution automation is an important component.
The distribution transformer monitoring terminal is a device for collecting electric energy information, and the functions of the distribution transformer monitoring terminal comprise electric energy data collection, distribution transformer and switch operation state monitoring, power supply electric energy quality monitoring and the like. Distribution transformer monitoring terminal equipment can produce certain heat when moving, in addition the external environment of higher temperature for the inside temperature of equipment is higher, and the battery has the danger of explosion even, and when the field usage simultaneously, because of dampproofing rain-proof requirement, the design of ventilating can not be done again to the equipment casing, otherwise rainwater or dew can influence the inside device of equipment.
In view of the above-mentioned drawbacks, the present designer actively makes research and innovation to create a distribution transformer monitoring terminal, which has industrial value.
Disclosure of Invention
The invention mainly aims to provide a distribution transformer monitoring terminal which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a distribution transformer monitoring terminal, includes the base, base upper end middle part fixed mounting has the box, the box front end has two doors through hinge movable mounting, the equal fixed mounting in box left end lower part and right-hand member lower part has radiator unit, box inner chamber upper portion is provided with dry subassembly, the equal fixed mounting in box left end upper portion and right-hand member upper portion has backup pad and actuating mechanism, two the common fixed mounting in backup pad upper end has the roof, box upper end front portion has the fly leaf through hinge movable mounting, be provided with axial fan in the base, box inner chamber diapire fixed mounting has the communicating ventilation net with axial fan, box inner chamber lower part fixed mounting has the transformer body, the anterior fixed mounting in transformer body upper end has detection module.
Preferably, actuating mechanism includes the protective housing, protective housing fixed mounting is between backup pad and box, the equal fixed mounting in position that box left end upper portion and right-hand member upper portion are located the protective housing has the fixed plate, and the equal fixed mounting in fixed plate upper end has servo motor, the position that box left end upper portion and right-hand member upper portion are located the protective housing is fixed mounting still has two limiting plates, and the limiting plate is located fixed plate the place ahead, two common sliding connection has the movable plate between the limiting plate, servo motor's output has drive gear through transmission shaft fixed mounting, the equal equidistance of one end that the box was kept away from to the movable plate has been seted up a plurality of tooth's socket, and the tooth.
Preferably, the front portion of the left end of the movable plate and the front portion of the right end of the movable plate are fixedly provided with extension plates, the extension plates and the movable plate are of an integrally formed structure, the upper end of each movable plate penetrates through the top wall of the protection box and is tightly attached to the lower end of each extension plate respectively, and the movable plates are connected with the protection box in a sliding mode.
Preferably, drying assembly includes the drying cabinet, the drying cabinet left end and right-hand member all are symmetry fixed mounting from top to bottom and have two draw runners, a continuous spout has all been seted up on inner chamber of the box left side wall upper portion and right side wall upper portion, and four draw runners are sliding connection respectively and are in the same place drying cabinet and box sliding connection in four spouts.
Preferably, the drying cabinet is made of a high-temperature-resistant plastic screen, the drying cabinet is of a cylindrical structure with an opening at the upper end and a hollow interior, and a recyclable drying machine is placed in the drying cabinet.
Preferably, radiator unit includes the heating panel, the one end equidistance fixed mounting that the box was kept away from to the heating panel has the vertical board of a plurality of, and vertical board and heating panel be the integrated into one piece structure, the one end rectangle array fixed mounting that the heating panel is close to the box has a plurality of heat conduction piece, and heat conduction piece and heating panel be the integrated into one piece structure, the corresponding mounting groove in position of a plurality of and heat conduction piece, a plurality of is all seted up to box left side tank wall lower part and right side tank wall lower part fixed mounting is in the same place radiator unit and box fixed connection in the mounting groove rather than corresponding to the heat conduction piece inlay fixed mounting, and the one end that the heat conduction piece is close to the box.
Preferably, the detection module comprises a single chip microcomputer, a power supply module and a temperature sensor, the single chip microcomputer is electrically connected with the power supply module and the temperature sensor, and the servo motors are electrically connected with the single chip microcomputer.
Preferably, the power module is a standby power supply and is not connected with the main circuit of the transformer, and the temperature sensor is provided with a lowest temperature threshold and a highest temperature threshold.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the drying component is arranged, so that moisture in the box body can be adsorbed, the drying degree of air in the box body is improved, and the transformer body in the box body is prevented from being damped.
2. According to the invention, the heat dissipation assembly is arranged, the heat conducting block can transfer heat in the box body to the heat dissipation plate, so that the contact area with the outside air is increased through the vertical plate, and a certain heat dissipation effect can be achieved.
3. When the temperature sensor detects that the temperature in the box body is higher than a preset maximum temperature threshold value, the single chip microcomputer can control the two servo motors to work, and further jack the movable plate.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a distribution transformer monitoring terminal according to the present invention;
FIG. 2 is a schematic diagram of the overall structure of the driving mechanism of the distribution transformer monitoring terminal according to the present invention;
FIG. 3 is a schematic diagram of the overall configuration of the drying assembly of the distribution transformer monitoring terminal of the present invention;
FIG. 4 is a schematic diagram of the overall structure of a heat dissipation assembly of the distribution transformer monitoring terminal according to the present invention;
fig. 5 is a block diagram of a detection module of the distribution transformer detection terminal of the present invention.
In the figure: 1. a base; 2. a box body; 3. double doors are opened; 4. a heat dissipating component; 41. a heat dissipation plate; 42. a vertical plate; 43. a heat conducting block; 44. mounting grooves; 5. a drying assembly; 51. a drying oven; 52. a slide bar; 53. a chute; 6. a support plate; 7. a top plate; 8. a drive mechanism; 81. a protective box; 82. a fixing plate; 83. a servo motor; 84. a transmission gear; 85. a limiting plate; 86. moving the plate; 87. a tooth socket; 9. a movable plate; 10. a ventilation net; 11. a transformer body; 12. a detection module; 121. a single chip microcomputer; 122. a power supply module; 123. a temperature sensor; 13. an extension plate.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-5, a distribution transformer monitoring terminal, including base 1, base 1 upper end middle part fixed mounting has box 2, box 2 front end has two divisions of doors 3 through hinge movable mounting, 2 left end lower parts of box and the equal fixed mounting of right-hand member lower part have radiator unit 4, 2 inner chamber upper portions of box are provided with drying assembly 5, 2 left end upper portions of box and the equal fixed mounting of right-hand member upper portion have backup pad 6 and actuating mechanism 8, the common fixed mounting in two backup pad 6 upper ends has roof 7, 2 upper end front portions of box have fly leaf 9 through hinge movable mounting, be provided with axial fan in the base 1, 2 inner chamber diapire fixed mounting of box have with the communicating ventilation net 10 of axial fan, 2 inner chamber lower parts fixed mounting of box have transformer body 11, the anterior fixed mounting in transformer body 11 upper end has.
The driving mechanism 8 comprises a protective box 81, the protective box 81 is fixedly arranged between the supporting plate 6 and the box body 2, the positions of the upper part of the left end and the upper part of the right end of the box body 2, which are positioned in the protective box 81, are both fixedly provided with a fixed plate 82, the upper ends of the fixed plates 82 are both fixedly provided with a servo motor 83, the positions of the upper part of the left end and the upper part of the right end of the box body 2, which are positioned in the protective box 81, are also fixedly provided with two limit plates 85, the limit plates 85 are positioned in front of the fixed plates 82, a moving plate 86 is jointly and slidably connected between the two limit plates 85, the output end of the servo motor 83 is fixedly provided with a transmission gear 84 through a transmission shaft, one end of the moving plate 86, which is far away from the box body 2, is equally provided with a plurality of tooth spaces, as the servo motor 83 continues to operate, the moving plate 86 can be caused to continue moving upward.
The front portion of the left end and the front portion of the right end of the movable plate 9 are fixedly provided with the extension plate 13, the extension plate 13 and the movable plate 9 are of an integrally formed structure, the upper ends of the two movable plates 86 penetrate through the top wall of the protective box 81 and are tightly attached to the lower end of the extension plate 13 respectively, the movable plates 86 are connected with the protective box 81 in a sliding mode, when the movable plates 86 move upwards, the movable plates 9 can be jacked up through the extension plates 13, a part of gaps are reserved, at the moment, the axial flow fan in the base 1 is started, hot air in the box body 2 is blown out through the gaps, and the purpose of rapid.
Drying assembly 5 includes drying cabinet 51, drying cabinet 51 left end and right-hand member all are symmetry fixed mounting from top to bottom have two draw runner 52, even spout 53 has all been seted up on 2 inner chamber left side wall upper portions of box and right side wall upper portion, four draw runner 52 respectively sliding connection be in the same place drying cabinet 51 and 2 sliding connection of box in four spout 53, drying cabinet 51 is made by high temperature resistant plastic screen, and drying cabinet 51 is upper end opening and inside hollow cylindrical structure, but place cyclic utilization's desiccator in drying cabinet 51, because fly leaf 9 passes through hinge connection with box 2, its leakproofness is not enough intact, so this is through being provided with drying assembly 5, can adsorb the moisture in the box 2, improve the degree of drying of the air in the box 2.
The heat dissipation assembly 4 comprises a heat dissipation plate 41, a plurality of vertical plates 42 are fixedly installed at the end, far away from the box body 2, of the heat dissipation plate 41 at equal intervals, the vertical plates 42 and the heat dissipation plate 41 are in an integrated structure, a plurality of heat conduction blocks 43 are fixedly installed at the end, close to the box body 2, of the heat dissipation plate 41 in a rectangular array manner, the heat conduction blocks 43 and the heat dissipation plate 41 are in an integrated structure, a plurality of installation grooves 44 corresponding to the heat conduction blocks 43 are formed in the lower portion of the box wall on the left side and the lower portion of the box wall on the right side of the box body 2, the heat conduction blocks 43 are fixedly installed in the corresponding installation grooves 44 in an embedded manner to fixedly connect the heat dissipation assembly 4 and the box body 2 together, one ends, close to the box body 2, of the heat conduction blocks 43 penetrate through the installation grooves 44 and extend to, and further a certain heat dissipation effect can be achieved.
The detection module 12 comprises a single chip microcomputer 121, a power supply module 122 and a temperature sensor 123, the single chip microcomputer 121 is electrically connected with the power supply module 122 and the temperature sensor 123, and the two servo motors 83 are electrically connected with the single chip microcomputer 121; the power module 122 is a standby power supply, and is not connected to the main circuit of the transformer, and the temperature sensor 123 has a minimum temperature threshold and a maximum temperature threshold.
It should be noted that, when the temperature sensor 123 detects that the temperature in the box 2 is greater than the preset maximum temperature threshold, the single chip 121 can control the two servo motors 83 to work, and further jack up the movable plate 9, in this process, the axial fan in the base 1 works, so that the hot air in the box 2 can be blown out, and the purpose of cooling is achieved, when the temperature sensor 123 detects that the temperature in the box 2 is less than the minimum preset temperature, the single chip 121 can control the two servo motors 83 to work in reverse rotation, that is, the movable plate 9 returns to the original position, the box 2 is covered, and the above processes are repeated, so that the temperature in the box 2 is not too high, and the normal work of the transformer is not affected.
It should be noted that the working principle of the distribution transformer monitoring terminal of the present invention is as follows: in the daily use process, the heat conducting block 43 can transfer the heat in the box body 2 to the heat radiating plate 41, so that the contact area with the outside air is increased through the vertical plate 42, and a certain heat radiating effect can be achieved, because the movable plate 9 is connected with the box body 2 through the hinge, the sealing performance is not good enough, the drying assembly 5 is arranged, the moisture in the box body 2 can be adsorbed, the drying degree of the air in the box body 2 is improved, when the temperature sensor 123 detects that the temperature in the box body 2 is greater than a preset maximum temperature threshold value, the two servo motors 83 can be controlled to work through the single chip microcomputer 121, the transmission shaft drives the transmission gear 84 to rotate, the tooth grooves 87 are meshed with the transmission gear 84, even if the movable plate 86 slides between the two limiting plates 85, the movable plate 86 can continue to work along with the servo motors 83, and the movable plate 86, can be through extension board 13 with fly leaf 9 jack-up, leave partly space, axial fan in the base 1 starts this moment, blow off the hot-air in the box 2 through this space, reach quick radiating purpose, when temperature-sensing ware 123 detects that the temperature in the box 2 is less than minimum when predetermineeing the temperature, can control two servo motor 83 work antiport through singlechip 121, even get fly leaf 9 and reply the normal position, cover box 2, process more than the repetition, can make the temperature in the box 2 be unlikely to too high and influence the transformer and normally work.
Claims (8)
1. The utility model provides a distribution transformer monitor terminal, includes base (1), its characterized in that: the improved box is characterized in that a box body (2) is fixedly mounted in the middle of the upper end of a base (1), a double door (3) is movably mounted at the front end of the box body (2) through a hinge, heat dissipation assemblies (4) are fixedly mounted on the lower portion of the left end and the lower portion of the right end of the box body (2), a drying assembly (5) is arranged on the upper portion of an inner cavity of the box body (2), supporting plates (6) and a driving mechanism (8) are fixedly mounted on the upper portion of the left end and the upper portion of the right end of the box body (2), a top plate (7) is fixedly mounted on the upper ends of the supporting plates (6) jointly, a movable plate (9) is movably mounted on the front portion of the upper end of the box body (2) through a hinge, an axial flow fan is arranged in the base (1, the front part of the upper end of the transformer body (11) is fixedly provided with a detection module (12).
2. The distribution transformer monitoring terminal of claim 1, wherein: actuating mechanism (8) includes protective housing (81), protective housing (81) fixed mounting is between backup pad (6) and box (2), the equal fixed mounting in position that box (2) left end upper portion and right-hand member upper portion are located protective housing (81) has fixed plate (82), and the equal fixed mounting in fixed plate (82) upper end has servo motor (83), the position that box (2) left end upper portion and right-hand member upper portion are located protective housing (81) still fixed mounting has two limiting plates (85), and limiting plate (85) are located fixed plate (82) the place ahead, two common sliding connection has movable plate (86) between limiting plate (85), the output of servo motor (83) has drive gear (84) through transmission shaft fixed mounting, a plurality of tooth's socket (87) have been seted up to the equal equidistance of one end that box (2) were kept away from to movable plate (86), and the tooth grooves (87) are meshed with the transmission gear (84).
3. The distribution transformer monitoring terminal of claim 2, wherein: the protection box is characterized in that an extension plate (13) is fixedly mounted on the front portion of the left end and the front portion of the right end of the movable plate (9), the extension plate (13) and the movable plate (9) are of an integrally formed structure, the upper end of the movable plate (86) penetrates through the top wall of the protection box (81) and is tightly attached to the lower end of the extension plate (13) respectively, and the movable plate (86) is connected with the protection box (81) in a sliding mode.
4. The distribution transformer monitoring terminal of claim 1, wherein: drying assembly (5) include drying cabinet (51), symmetry fixed mounting has two draw runner (52) about drying cabinet (51) left end and right-hand member all are, even spout (53) have all been seted up on box (2) inner chamber left side wall upper portion and right side wall upper portion, and four draw runner (52) sliding connection respectively are in the same place drying cabinet (51) and box (2) sliding connection in four spout (53).
5. The distribution transformer monitoring terminal of claim 4, wherein: the drying box (51) is made of a high-temperature-resistant plastic screen, the drying box (51) is of a cylindrical structure with an opening at the upper end and a hollow interior, and a recyclable drying machine is placed in the drying box (51).
6. The distribution transformer monitoring terminal of claim 1, wherein: the heat dissipation assembly (4) comprises a heat dissipation plate (41), a plurality of vertical plates (42) are fixedly arranged at one end of the heat dissipation plate (41) far away from the box body (2) at equal intervals, the vertical plate (42) and the heat dissipation plate (41) are of an integrated structure, a plurality of heat conduction blocks (43) are fixedly arranged at one end of the heat dissipation plate (41) close to the box body (2) in a rectangular array manner, the heat conducting block (43) and the heat radiating plate (41) are of an integrated structure, the lower part of the left side box wall and the lower part of the right side box wall of the box body (2) are respectively provided with a plurality of mounting grooves (44) corresponding to the positions of the heat conducting block (43), the plurality of heat conducting blocks (43) are fixedly mounted in the corresponding mounting grooves (44) in an embedding way to fixedly connect the heat radiating component (4) and the box body (2) together, and one end of the heat conducting block (43) close to the box body (2) penetrates through the mounting groove (44) and extends to the inner cavity of the box body (2).
7. The distribution transformer monitoring terminal of claim 2, wherein: the detection module (12) comprises a single chip microcomputer (121), a power supply module (122) and a temperature sensor (123), the single chip microcomputer (121) is electrically connected with the power supply module (122) and the temperature sensor (123), and the two servo motors (83) are electrically connected with the single chip microcomputer (121).
8. The distribution transformer monitoring terminal of claim 7, wherein: the power supply module (122) is a standby power supply and is not connected with the main circuit of the transformer, and the temperature sensor (123) is provided with a lowest temperature threshold and a highest temperature threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011124677.8A CN112526403A (en) | 2020-10-20 | 2020-10-20 | Distribution transformer monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011124677.8A CN112526403A (en) | 2020-10-20 | 2020-10-20 | Distribution transformer monitoring terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112526403A true CN112526403A (en) | 2021-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011124677.8A Pending CN112526403A (en) | 2020-10-20 | 2020-10-20 | Distribution transformer monitoring terminal |
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| CN (1) | CN112526403A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189427A (en) * | 2021-05-07 | 2021-07-30 | 国家电网有限公司 | Electric energy quality monitoring device with ungrounded neutral point |
| CN113325249A (en) * | 2021-04-17 | 2021-08-31 | 国网山东省电力公司淄博供电公司 | Box transformer state evaluation device |
| CN114062863A (en) * | 2021-11-11 | 2022-02-18 | 国网四川省电力公司南充供电公司 | Transformer partial discharge monitoring devices convenient to installation |
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| CN111343814A (en) * | 2020-03-11 | 2020-06-26 | 张树征 | Electric power monitoring placement pile and using method thereof |
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| CN211046217U (en) * | 2020-05-09 | 2020-07-17 | 山东华远电力科技有限公司 | Outdoor box-type substation |
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| CN113325249A (en) * | 2021-04-17 | 2021-08-31 | 国网山东省电力公司淄博供电公司 | Box transformer state evaluation device |
| CN113325249B (en) * | 2021-04-17 | 2023-09-29 | 国网山东省电力公司淄博供电公司 | State evaluation device for box transformer |
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Effective date of registration: 20220107 Address after: 264000 Jiefang Road 158, Zhifu District, Yantai, Shandong Applicant after: STATE GRID SHANDONG ELECTRIC POWER COMPANY YANTAI POWER SUPPLY Co. Address before: 264000 Jiefang Road 158, Zhifu District, Yantai, Shandong Applicant before: STATE GRID SHANDONG ELECTRIC POWER COMPANY YANTAI POWER SUPPLY Co. Applicant before: STATE GRID CORPORATION OF CHINA |
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