CN113422318A - 72.5kV looped netowrk cabinet of offshore wind power is exclusively used in - Google Patents
72.5kV looped netowrk cabinet of offshore wind power is exclusively used in Download PDFInfo
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- CN113422318A CN113422318A CN202110598106.6A CN202110598106A CN113422318A CN 113422318 A CN113422318 A CN 113422318A CN 202110598106 A CN202110598106 A CN 202110598106A CN 113422318 A CN113422318 A CN 113422318A
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- 238000007789 sealing Methods 0.000 claims description 51
- 238000003466 welding Methods 0.000 claims description 30
- 230000003068 static effect Effects 0.000 claims description 22
- 239000012212 insulator Substances 0.000 claims description 20
- 238000011022 operating instruction Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 38
- 238000010248 power generation Methods 0.000 description 5
- 229910018503 SF6 Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 235000002639 sodium chloride Nutrition 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000003440 toxic substance Substances 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
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/6606—Terminal arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
-
- 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
- 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
- H02B1/202—Cable lay-outs
-
- 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
- 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
- H02B13/0352—Gas-insulated switchgear for three phase switchgear
-
- 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
- H02B13/045—Details of casing, e.g. gas tightness
-
- 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
- H02B13/075—Earthing arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
A72.5 kV ring main unit special for offshore wind power belongs to the technical field of power switches and overcomes the problems that a 35kV ring main unit cannot be applied to a 72.5kV system due to the limitation of voltage class, the traditional high-voltage gas insulated switchgear and dry air insulated high-voltage gas insulated switchgear have large air leakage problem and are inconvenient to maintain and repair, and the 72.5kV ring main unit is characterized by comprising an upper air box serving as a circuit breaker air box and a lower air box serving as a submarine cable connecting air box, wherein a first sealed operating mechanism is arranged outside the upper air box, a second sealed operating mechanism and a third sealed operating mechanism are arranged outside the lower air box, the ring main unit has the beneficial effects that one ring main unit is simultaneously connected with a generator side transformer and connected with ring nets of submarine cables on two sides of a wind tower, the structure is compact, and the sealed operating mechanisms avoid the corrosion of offshore salt spray and humid environment on metal surfaces, the requirements of offshore wind power on transportation, installation and maintenance of electrical equipment are met.
Description
Technical Field
The invention belongs to the technical field of power switches, and particularly relates to a 72.5kV ring main unit special for offshore wind power.
Background
Offshore wind power, as a clean energy, has been greatly developed in recent years, and the installed capacity is increased year by year, and gradually developed from the past 2 megawatts to 8 megawatts and 12 megawatts. The ring main unit for offshore wind power is installed in a wind power generation tower, is suitable for the operation environment of ocean high salt fog and high humidity, and not only needs to meet system parameters and wiring requirements, but also needs to be installed in the power generation tower due to the limitation of the diameter of a tower body, so that the equipment is small in size, light in weight, easy to install and disassemble, and can be transported out from an oval tower door after being disassembled.
The existing switchgear applied to offshore wind power is divided into three types:
the first is the traditional 35kV ring main unit, when the installed capacity is smaller, the switchgear matched with the wind driven generator is usually 35kV ring main unit, like the '35 kV ring main unit for assembled wind power', which is disclosed by the utility model with the application number of CN201020672980.7, the utility model comprises a front side plate, a middle side plate, a rear side plate, an upper side plate, a cross beam and a vertical beam to form a basic cabinet body frame, the front of the ring main unit is formed by an eyebrow, an instrument door, a counter panel, a front door, a left panel and a right panel, and the whole ring main unit is sealed by the upper cover plate, the lower cover plate and the rear sealing plate; the utility model discloses an adopt the assembled building blocks structure of assembling completely, keep its each part homoenergetic freely to come in and go out wind power generation tower tube door, the cabinet body after the combination satisfies the requirement of little installation space of wind power generation tower, easy to assemble and quick replacement trouble part, is applicable to the system that rated voltage is 35 kV. The 35kV ring main unit matched with the wind driven generator is relatively economical in a wind tower with small installed capacity, but in the field of offshore wind power, with the continuous increase of installed capacity, the deep sea wind field is developed gradually, in order to better optimize system cost, for a wind driven generator with 7 megawatts or more, the most economical operation voltage is 72.5kV, the maximum rated current is 1250A, the maximum breaking current is 25kA, and the traditional 35kV ring main unit cannot be applied to a 72.5kV system due to the limitation of voltage class. Therefore, a 72.5kV ring main unit special for offshore wind power and meeting the requirement of 7 megawatts and above needs to be researched and developed.
The second one is the traditional high-voltage Gas Insulated Switchgear (GIS) which is applied to the offshore wind power system after structural modification and marine environment adaptability design, although the voltage grade can meet the requirement, because the GIS product adopts SF6The gas pressure inside the gas insulated circuit breaker is high (0.6-0.7 MPa), and the gas leakage problem is large. Because wind generating sets of more than 7 megawatts are generally in open sea, the convenience and timeliness of maintenance and overhaul are poor, the cost is high, once air leaks, the product loses the function, and the continuous operation of the generator is greatly influenced. In addition, when using SF6SF leaked out when indoor switch with insulating and arc-extinguishing medium gas leaks in use process6Gas and its decomposition products will accumulate in the lower indoor space and are not easy to diffuse, causing local oxygen deficiency and toxic substances, and constituting a serious danger to the safety of the overhaul and inspection personnel entering the room, therefore, the traditional high-voltage Gas Insulated Switchgear (GIS) needs to be used in the whole life cycleCare should be taken to avoid SF6The gas leaks into the atmosphere. To align SF in the ring main unit6And whether the gas leaks is detected and flow guide treatment is carried out, so that the normal operation of the wind generating set and the life safety of workers are ensured. The utility model discloses an application number is CN 201920300516.6's utility model discloses a "guiding device of offshore wind turbine generator system looped netowrk cabinet sulfur hexafluoride gas leakage", this utility model contains monitoring unit, the control unit, power supply unit, water conservancy diversion execution unit, monitoring unit, water conservancy diversion execution unit are installed respectively in the tower section of thick bamboo that is equipped with the looped netowrk cabinet, and the control unit is installed outside the tower section of thick bamboo, and the power supply unit provides the power for each device, and the control unit links to each other with monitoring unit, water conservancy diversion execution unit respectively. The utility model discloses a guiding device to SF in the looped netowrk cabinet6The gas is monitored, and an effective flow guide function is achieved when leakage occurs. However, the utility model can only be used for SF in the ring main unit6Whether the gas leaks is detected, and diversion treatment is carried out, so that the life safety of workers is guaranteed, but the gas leakage cannot be guaranteed, and the normal operation of the wind generating set cannot be guaranteed.
The third is dry air insulated high voltage Gas Insulated Switchgear (GIS) using vacuum circuit breaker, which uses dry air (79.5% N2+ 20.5% O2) with weak insulation capacity as insulation medium, and is superior to the second product in environmental protection performance, but even if the vacuum circuit breaker is used, the gas pressure inside the equipment is still high (about 0.6 MPa), the possibility of gas leakage is still high, the maintenance and repair are very inconvenient, once gas leakage occurs, the same problem as the second product will be encountered, the product loses function, and the continuous operation of the generator is greatly affected.
Disclosure of Invention
The invention aims to solve the problems of overcoming the defects and defects of the prior art, and provides the special 72.5kV ring main unit for offshore wind power, which not only meets the requirements of offshore wind power parameters, structures and environmental protection of 7 megawatts and above, but also can adapt to offshore salt fog and humid environments, is free from maintenance, reduces operation and maintenance cost, and ensures operation continuity.
The technical scheme adopted by the invention comprises an upper gas box serving as a circuit breaker gas box and a lower gas box serving as a submarine cable connecting gas box, wherein an upper welding box body adopted by the upper gas box and a lower welding box body adopted by the lower gas box are fixedly connected and then are arranged on a cabinet body shell; the upper air box is of a three-phase structure, each phase comprises a first cable connecting sleeve, 2 first pillar insulators, an upper three-position switch, a vacuum circuit breaker and an upper bus connector sleeve, the lower air box is of a three-phase structure, each phase comprises a first quick grounding switch, 3 second pillar insulators, a first lower three-position switch, 2 second cable connecting sleeves, a second lower three-position switch, a second quick grounding switch and a lower bus connector sleeve, the first cable connecting sleeve is arranged in the upper air box, the end part of the first cable connecting sleeve extends out of the upper air box and is connected with a cable, a current transformer is sleeved on the cable, the first cable connecting sleeve positioned in the upper air box is fixedly connected with the upper three-position switch through a long connecting bus, meanwhile, the lower end of the first pillar insulator is fixedly connected with the upper three-position switch, the upper end of the first pillar insulator is fixedly connected with the upper air box through a screw, the upper three-position switch is horizontally fixed, the vacuum circuit breaker is horizontally arranged in the upper air box, a rear wire outlet end of the vacuum circuit breaker is connected with a fixed contact of the upper three-position switch through a short connecting bus, a front wire outlet end of the vacuum circuit breaker is connected with an upper bus connector sleeve, a first sealing operation mechanism is arranged on the left side of the outer part of the upper air box, the first sealing operation mechanism is an operation mechanism of the vacuum circuit breaker and the upper three-position switch, and the opening and closing of the upper three-position switch and the vacuum circuit breaker are respectively operated according to operation instructions, so that the opening and closing of main loop current are realized; the 2 second cable connecting sleeves are arranged in the lower air box and are respectively positioned at the left side and the right side in the lower air box, each phase of the second cable connecting sleeves comprises 2 and 6 second cable connecting sleeves, the end parts of the second cable connecting sleeves extend out of the lower air box and are respectively connected with the submarine cable at the left side and the submarine cable at the right side, a current transformer is also sleeved on the submarine cable, the second cable connecting sleeves positioned at the left side in the lower air box are fixedly connected with the first lower three-position switch through L-shaped connecting buses and are used as supports of the first lower three-position switch, the first quick grounding switch is positioned at the upper part of the first lower three-position switch and is fixedly connected with the first lower three-position switch, meanwhile, the first quick grounding switch is fixed on the lower air box through a second support insulator, a second sealed operating mechanism is fixedly arranged at the left side of the outer part of the lower air box, and is an operating mechanism of the first quick grounding switch and the third lower three-position switch, switching-on and switching-off of the first quick grounding switch and the first lower three-position switch are respectively operated according to the operation instruction, so that the switching-on and switching-off of the main loop current are realized; a second cable connecting sleeve on the right side of the lower air box is fixedly connected with a second lower three-position switch through an L-shaped connecting bus and is used as a support of the second lower three-position switch, the second quick grounding switch is positioned on the upper part of the second lower three-position switch and is fixedly connected with the second lower three-position switch, meanwhile, the second quick grounding switch is fixed on the lower air box through a second pillar insulator, a third sealed operating mechanism is fixedly arranged on the right side of the outer part of the lower air box and is an operating mechanism of the second quick grounding switch and the second lower three-position switch, the second quick grounding switch and the second lower three-position switch are respectively operated according to operating instructions so as to realize the opening and closing of the main loop current, the upper welding box body of the upper air box is connected with a bus connector sleeve through a screw, the lower welding box body of the lower air box is connected with the lower bus connector sleeve through a screw, install connection copper conductor and silica gel bus connector in last bus connector sleeve pipe and lower bus connector sleeve pipe, go up gas tank and lower gas tank and realize the conductive loop through connecting the copper conductor and connect.
SF is respectively filled in the upper air box and the lower air box6The gas acts as an insulating medium between the phases and relative to ground.
Go up the welding of gas tank and have L shape connecting plate on the last welding box body down the welding has the shape of falling U strengthening rib on the lower welding box body of gas tank, has weld nut at the lower skin weld of the shape of falling U strengthening rib, L shape connecting plate passes through connecting screw locking connection with the shape of falling U strengthening rib, thereby will go up gas tank and lower gas tank fixed connection.
The first lower three-position switch is of a three-phase structure, each phase of the first lower three-position switch is composed of a grounding static contact, an insulating lead screw, a spring contact finger, a middle static contact, an isolating moving contact and an isolating static contact, 2 conductive support columns are welded at the lower end of the middle static contact, a support plate is welded at the upper end of the middle static contact, the first lower three-position switch and the second quick grounding switch are directly connected through the support plate, the insulating lead screw rotates under the driving of a mechanism to drive the isolating moving contact to move linearly left and right, and the opening and closing of the first lower three-position switch are completed.
First sealed operating device includes three-position switch mechanism and circuit breaker mechanism, installs the sealed cowling outside three-position switch mechanism and circuit breaker mechanism, the sealed cowling includes left end sealed cowling and right-hand member sealed cowling, through flange joint between left end sealed cowling and the right-hand member sealed cowling to install the sealed pad of second and realize sealing connection the transparent shrouding before the left end face of left end sealed cowling is installed, and install the sealed pad of third and realize sealing connection the right-hand member face of right-hand member sealed cowling is installed first sealed pad, realizes the sealing connection with last gas tank.
The upper welding box body and the lower welding box body are both airtight box bodies formed by laser welding stainless steel plates.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, one ring main unit is connected with the generator side transformer and the ring main units of the submarine cables on two sides of the wind tower at the same time, and one ring main unit realizes the functions of three ring main units, so that the occupied area is greatly reduced, and the wind tower wind power generation system is very suitable for being used in the wind tower.
(2) The invention is provided with a first sealed operating mechanism at the left side outside the upper air box, and the first sealed operating mechanism respectively operates the three-position switch and the opening and closing of the vacuum circuit breaker according to the operating instruction, thereby realizing the opening and closing of the current of the main loop; a second sealed operating mechanism is fixedly arranged on the left side of the outer part of the lower air box, and the second sealed operating mechanism respectively operates the opening and closing of the first quick grounding switch and the first lower three-position switch according to operating instructions, so that the opening and closing of the main loop current are realized; the invention realizes the sealing of the three-position switch mechanism and the circuit breaker mechanism through the 3 sealed operating mechanisms, avoids the corrosion of the metal surface in the sea salt fog and humid environment, reduces the cost of special surface treatment, and improves the safety and reliability of the three-position switch mechanism and the circuit breaker mechanism.
(3) The main structure of the invention is divided into an upper air box, a lower air box, 3 sealed operating mechanisms and 6 modules of a cabinet body shell, which is beneficial to assembly, disassembly and transportation, and the largest module among the 6 modules can conveniently enter and exit a tower door of an air tower, thus completely meeting the requirements of offshore wind power on transportation, installation and maintenance of electrical equipment.
(4) The first cable connecting sleeve positioned in the upper air box is fixedly connected with the upper three-position switch through the long connecting bus, the rear wire outlet end of the vacuum circuit breaker is connected with the fixed contact of the upper three-position switch through the short connecting bus, the second cable connecting sleeve positioned on the left side in the lower air box is fixedly connected with the first lower three-position switch through the L-shaped connecting bus and serves as a support of the first lower three-position switch, the second cable connecting sleeve positioned on the right side in the lower air box is fixedly connected with the second lower three-position switch through the L-shaped connecting bus and serves as a support of the second lower three-position switch, and the upper air box and the lower air box are fixedly connected through the structures of the L-shaped connecting plate, the inverted U-shaped reinforcing ribs and the welding nuts, so that the structure of the vacuum circuit breaker is more compact, and the assembly and disassembly are more convenient.
(5) According to the invention, the lower end of the middle static contact is welded with the 2 conductive support columns, so that the middle static contact can be ensured not to be rotated under the action of electric power, the upper end of the middle static contact is welded with the support plate, and the support plate is directly connected with the first quick grounding switch and the second quick grounding switch, so that the using amount of buses can be saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a partial enlarged view of FIG. 1 at B;
FIG. 4 is a schematic diagram of the lower three-position switch of the present invention;
fig. 5 is a schematic structural diagram of a circuit breaker and a three-position switch sealing type operating mechanism according to the present invention.
In the figure:
1. the upper three-position switch is arranged on the upper cover,
2. a vacuum circuit breaker is provided with a vacuum circuit breaker,
3. the upper part is welded with a box body,
4. a first sealing-type operation mechanism for operating the first sealing-type operation mechanism,
4-1, a three-position switch mechanism, 4-2, a circuit breaker mechanism,
4-3, a right end sealing cover, 4-4, a first sealing gasket,
4-5, a second sealing gasket, 4-6, a third sealing gasket,
4-7 parts of a front transparent sealing plate, 4-8 parts of a left end sealing cover,
5. the lower part of the box body is welded,
6. a first quick grounding switch is arranged on the first side of the switch,
7. a second sealing-type operation mechanism is arranged on the second sealing-type operation mechanism,
8. a first lower three-position switch,
8-1, a grounding static contact, 8-2, an insulating lead screw,
8-3 spring contact fingers, 8-4 middle fixed contacts,
8-4-1, a conductive support column, 8-4-2, a support plate,
8-5 parts of an isolation moving contact, 8-6 parts of an isolation static contact,
9-1, a first cable connecting sleeve, 9-2, a second cable connecting sleeve,
10. the sea cable is connected with the sea cable,
11. a shell of the cabinet body is provided with a plurality of through holes,
12. a current transformer is arranged in the shell body,
13. the copper conductor is connected with the first end of the copper conductor,
14. the lower bus bar is connected with the sleeve pipe,
15. the upper bus bar is connected with the sleeve pipe,
16-1, a first post insulator, 16-2, a second post insulator,
17. the power cable is provided with a power cable,
18. the long connecting bus bar is connected with the bus bar,
19. a short-circuit connecting bus bar is arranged on the bus bar,
20. a second fast grounding switch is arranged on the base,
21. a second lower three-position switch, a first lower three-position switch,
22. a third sealing-type operation mechanism for operating the valve,
23. a connector of a silica gel bus bar is arranged,
24. an L-shaped connecting plate,
25. the connecting screw is connected with the screw rod,
26. the nut is welded on the outer side of the nut,
27. inverted U-shaped reinforcing rib
An L-shaped connecting bus bar 28,
29. the air-feeding box is arranged at the lower part of the air-feeding box,
30. a lower air box.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the main loop of the 72.5kV ring main unit is divided into an upper air box 29 and a lower air box 30, wherein an upper welding box 3 adopted by the upper air box 29 and a lower welding box 5 adopted by the lower air box 30 are both airtight boxes formed by laser welding stainless steel plates, and the upper welding box 3 and the lower welding box 5 are fixedly connected and then installed on the cabinet body shell 11; the upper air box 29 is a breaker air box and is connected with a transformer in the tower cylinder through an external insertion cable when in use; the upper air box 29 is of a three-phase structure, each phase comprises a first cable connecting sleeve 9-1, 2 first column insulators 16-1, an upper three-position switch 1, a vacuum circuit breaker 2 and an upper bus connector sleeve 15, the first cable connecting sleeve 9-1 is installed inside the upper air box 29, the end portion of the first cable connecting sleeve 9-1 extends out of the upper air box 29 to be connected with a cable 17, a current transformer 12 is sleeved on the cable 17, the first cable connecting sleeve 9-1 located in the upper air box 29 is fixedly connected with the upper three-position switch 1 through a long connecting bus 18, meanwhile, the lower end of the first column insulator 16-1 is fixedly connected with the upper three-position switch 1, the upper end of the first column insulator 16-1 is fixedly connected with the upper air box 29 through a screw, and therefore the upper three-position switch 1 is horizontally fixed, and the vacuum circuit breaker2 is horizontally arranged in the upper air box 29, the rear outlet end of the vacuum circuit breaker 2 is connected with the static contact of the upper three-position switch 1 through a short connecting bus 19, the front outlet end of the vacuum circuit breaker 2 is connected with an upper bus connector sleeve 15, and SF is charged in the upper air box 296The gas is used as an insulation medium between phases and relative to the ground, a first sealed operating mechanism 4 is installed on the left side of the outer portion of the upper gas box 29, the first sealed operating mechanism 4 is an operating mechanism of the vacuum circuit breaker 2 and the upper three-position switch 1, and the opening and closing of the upper three-position switch 1 and the vacuum circuit breaker 2 are respectively operated according to an operating instruction, so that the opening and closing of the main loop current are realized;
the lower air box 30 is a submarine cable connecting air box and is a connection point and a disconnection point of 2 submarine cables between wind towers, the lower air box 30 is of a three-phase structure, each phase comprises a first quick grounding switch 6, 3 second post insulators 16-2, a first lower three-position switch 8, 2 second cable connecting sleeves 9-2, a second lower three-position switch 21, a second quick grounding switch 20 and a lower bus connector sleeve 14, the 2 second cable connecting sleeves 9-2 are arranged in the lower air box 30 and are respectively positioned on the left side and the right side inside the lower air box 30, the 2 and 3 phases of the second cable connecting sleeves 9-2 are 6 in total, the end parts of the second cable connecting sleeves 9-2 extend out of the lower air box 30 and are respectively connected with the submarine cables 10 on the left side and the submarine cables 10 on the right side, a current transformer 12 is also sleeved on the submarine cables 10, the second cable connecting sleeve 9-2 positioned at the left side in the lower air box 30 is fixedly connected with the first lower three-position switch 8 through an L-shaped connecting bus 28 and is used as a support of the first lower three-position switch 8, the first quick grounding switch 6 is positioned at the upper part of the first lower three-position switch 8 and is fixedly connected with the first lower three-position switch, meanwhile, the first quick grounding switch 6 is fixed on the lower air box 30 through a second post insulator 16-2, SF is filled in the lower air box 306Gas is used as an insulating medium between phases and relative to the ground; a second sealing type operating mechanism 7 is fixedly installed on the left side of the outer portion of the lower air box 30, the second sealing type operating mechanism 7 is an operating mechanism of the first quick grounding switch 6 and the first lower third position switch 8, and the opening and closing of the first quick grounding switch 6 and the first lower third position switch 8 are respectively operated according to operating instructions, so that the main air box is realizedSwitching of loop current; the second cable connecting sleeve 9-2 located on the right side in the lower air box 30 is fixedly connected with the second lower three-position switch 21 through an L-shaped connecting bus 28 and is used as a support of the second lower three-position switch 21, the second quick grounding switch 20 is located on the upper portion of the second lower three-position switch 21 and is fixedly connected with the second lower three-position switch, meanwhile, the second quick grounding switch 20 is fixed on the lower air box 30 through a second post insulator 16-2, a third sealed operating mechanism 22 is fixedly installed on the right side of the outside of the lower air box 30, the third sealed operating mechanism 22 is operating mechanisms of the second quick grounding switch 20 and the second lower three-position switch 21, and the second quick grounding switch 20 and the second lower three-position switch 21 are respectively operated to be switched on and switched off according to an operating instruction, so that the opening and closing of the main loop current are realized.
As shown in fig. 1 and 2, a bus bar connector bushing 15 is screwed to the upper soldering case 3 of the upper gas box 29, a lower bus bar connector bushing 14 is screwed to the lower soldering case 5 of the lower gas box 30, a connecting copper conductor 13 and a silicone bus bar connector 23 are installed in the upper bus bar connector bushing 15 and the lower bus bar connector bushing 14, and the upper gas box 29 and the lower gas box 30 are connected by the connecting copper conductor 13 to form a conductive circuit.
As shown in fig. 3, the upper air box 29 and the lower air box 30 are connected through an L-shaped connecting plate 24, and the structure is specifically that the L-shaped connecting plate 24 is welded on the upper welding box 3 of the upper air box 29, the inverted U-shaped reinforcing rib 27 is welded on the lower welding box 5 of the lower air box 30, the welding nut 26 is welded on the lower surface of the inverted U-shaped reinforcing rib 27, and the L-shaped connecting plate 24 and the inverted U-shaped reinforcing rib 27 are locked and connected through a connecting screw 25, so that the upper air box 29 and the lower air box 30 are fixedly connected.
The first lower three-position switch 8 and the second lower three-position switch 21 are both of three-phase structures, and the three-phase structures are completely the same. As shown in fig. 4, taking one phase of the first lower three-position switch 8 as an example, each phase is composed of a grounding static contact 8-1, an insulating lead screw 8-2, a spring contact finger 8-3, an intermediate static contact 8-4, an isolating moving contact 8-5 and an isolating static contact 8-6, the lower end of the intermediate static contact 8-4 is welded with 2 conductive support columns 8-4-1, which can ensure that the intermediate static contact 8-4 is not rotated under the action of electromotive force, the upper end of the intermediate static contact 8-4 is welded with a support plate 8-4-2, the support plate 8-4-2 is directly connected with the first fast grounding switch 6 and the second fast grounding switch 20, so as to save the amount of bus bars, the insulating lead screw 8-2 is rotated under the driving of the mechanism to drive the isolating moving contact to move linearly left and right, and completing the opening and closing of the first lower three-position switch 8.
As shown in fig. 5, the first sealing operation mechanism 4 includes a three-position switch mechanism 4-1 and a breaker mechanism 4-2, sealing caps are installed outside the three-position switch mechanism 4-1 and the breaker mechanism 4-2, the sealing caps include a left sealing cap 4-8 and a right sealing cap 4-3, the left sealing cap 4-8 is connected to the right sealing cap 4-2 through a flange, and a second sealing pad 4-5 is installed to achieve sealing connection, a front transparent sealing plate 4-7 is installed on the left end face of the left sealing cap 4-8, and a third sealing pad 4-6 is installed to achieve sealing connection, and a first sealing pad 4-4 is installed on the right end face of the right sealing cap 4-3 to achieve sealing connection with the upper air box 29.
Claims (6)
1. A72.5 kV ring main unit special for offshore wind power comprises an upper gas box (29) serving as a circuit breaker gas box and a lower gas box (30) serving as a submarine cable connection gas box, wherein an upper welding box body (3) adopted by the upper gas box (29) and a lower welding box body (5) adopted by the lower gas box (30) are fixedly connected and then are installed on a cabinet body shell (11); the upper air box (29) is of a three-phase structure, each phase comprises a first cable connecting sleeve (9-1), 2 first pillar insulators (16-1), an upper three-position switch (1), a vacuum circuit breaker (2) and an upper bus connector sleeve (15), the lower air box (30) is of a three-phase structure, each phase comprises a first quick grounding switch (6), 3 second pillar insulators (16-2), a first lower three-position switch (8), 2 second cable connecting sleeves (9-2), a second lower three-position switch (21), a second quick grounding switch (20) and a lower bus connector sleeve (14), and the upper air box is characterized in that the first cable connecting sleeve (9-1) is arranged inside the upper air box (29), the end part of the first cable connecting sleeve extends out of the upper air box (29) to be connected with a cable (17), and a current transformer (12) is sleeved on the cable (17), a first cable connecting sleeve (9-1) positioned in an upper air box (29) is fixedly connected with an upper three-position switch (1) through a long connecting bus (18), meanwhile, the lower end of a first post insulator (16-1) is fixedly connected with the upper three-position switch (1), the upper end of the first post insulator (16-1) is fixedly connected with the upper air box (29) through a screw, so that the upper three-position switch (1) is horizontally fixed, a vacuum circuit breaker (2) is horizontally arranged in the upper air box (29), the rear outlet end of the vacuum circuit breaker (2) is connected with the fixed contact of the upper three-position switch (1) through a short connecting bus (19), the front outlet end of the vacuum circuit breaker (2) is connected with an upper bus connector sleeve (15), a first sealed operating mechanism (4) is arranged on the left side of the outside of the upper air box (29), the first sealing type operating mechanism (4) is an operating mechanism of the vacuum circuit breaker (2) and the upper three-position switch (1), and the opening and closing of the upper three-position switch (1) and the vacuum circuit breaker (2) are respectively operated according to an operating instruction, so that the opening and closing of the main loop current are realized; the 2 second cable connecting sleeves (9-2) are arranged in the lower air box (30) and are respectively positioned at the left side and the right side in the lower air box (30), each phase of the second cable connecting sleeves (9-2) is 2, the number of the phases of the second cable connecting sleeves (9-2) is 6, the end parts of the second cable connecting sleeves (9-2) extend out of the lower air box (30) and are respectively connected with a submarine cable (10) at the left side and a submarine cable (10) at the right side, a current transformer (12) is sleeved on the submarine cable (10), the second cable connecting sleeve (9-2) at the left side in the lower air box (30) is fixedly connected with the first lower three-position switch (8) through an L-shaped connecting bus (28) and is used as a support of the first lower three-position switch (8), the first quick grounding switch (6) is positioned at the upper part of the first lower three-position switch (8) and is fixedly connected with the first lower three-position switch (8), meanwhile, the first quick grounding switch (6) is fixed on the lower air box (30) through a second post insulator (16-2), a second sealing type operating mechanism (7) is fixedly installed on the left side of the outer portion of the lower air box (30), the second sealing type operating mechanism (7) is an operating mechanism of the first quick grounding switch (6) and the first lower three-position switch (8), and the opening and closing of the first quick grounding switch (6) and the first lower three-position switch (8) are respectively operated according to operating instructions, so that the opening and closing of the main loop current are realized; a second cable connecting sleeve (9-2) positioned on the right side in the lower air box (30) is fixedly connected with a second lower three-position switch (21) through an L-shaped connecting bus (28) and used as a support of the second lower three-position switch (21), the second quick grounding switch (20) is positioned on the upper part of the second lower three-position switch (21) and is fixedly connected with the second lower three-position switch, meanwhile, the second quick grounding switch (20) is fixed on the lower air box (30) through a second support insulator (16-2), a third sealed operating mechanism (22) is fixedly installed on the right side of the outer part of the lower air box (30), the third sealed operating mechanism (22) is an operating mechanism of the second quick grounding switch (20) and the second lower three-position switch (21), and the second quick grounding switch (20) and the second lower three-position switch (21) are respectively operated according to an operating instruction, thereby realize opening and shutting of major loop current go up gas tank (29) last welding box (3) go up bus connector sleeve pipe (15) through the screw connection, go up lower bus connector sleeve pipe (14) through the screw connection on lower welding box (5) of gas tank (30) down, install in last bus connector sleeve pipe (15) and lower bus connector sleeve pipe (14) and connect copper conductor (13) and silica gel bus connector (23), go up gas tank (29) and gas tank (30) and realize the conductive loop through connecting copper conductor (13) and connect.
2. 72.5kV ring main unit special for offshore wind power as claimed in claim 1, wherein SF is filled in the upper air box (29) and the lower air box (30) respectively6The gas acts as an insulating medium between the phases and relative to ground.
3. The 72.5kV ring main unit special for offshore wind power as claimed in claim 1 or 2, wherein an L-shaped connecting plate (24) is welded on an upper welding box body (3) of the upper gas box (29), an inverted U-shaped reinforcing rib (27) is welded on a lower welding box body (5) of the lower gas box (30), a welding nut (26) is welded on the lower surface of the inverted U-shaped reinforcing rib (27), and the L-shaped connecting plate (24) and the inverted U-shaped reinforcing rib (27) are locked and connected through a connecting screw (25), so that the upper gas box (29) and the lower gas box (30) are fixedly connected.
4. The 72.5kV ring main unit special for offshore wind power according to claim 1 or 2, wherein the first lower three-position switch (8) is of a three-phase structure, each phase is composed of a grounding static contact (8-1), an insulating lead screw (8-2), a spring contact finger (8-3), an intermediate static contact (8-4), an isolation moving contact (8-5) and an isolation static contact (8-6), the lower end of the intermediate static contact (8-4) is welded with 2 conductive support columns (8-4-1), the upper end of the intermediate static contact (8-4) is welded with a support plate (8-4-2), and the support plate (8-4-2) is directly connected with the first fast grounding switch (6) and the second fast grounding switch (20), the insulating screw rod (8-2) is driven by the mechanism to rotate to drive the isolating moving contact to move linearly left and right, and the opening and closing of the first lower three-position switch (8) are completed.
5. The 72.5kV ring main unit special for offshore wind power as claimed in claim 1 or 2, wherein the first sealing operating mechanism (4) comprises a three-position switch mechanism (4-1) and a breaker mechanism (4-2), a sealing cover is installed outside the three-position switch mechanism (4-1) and the breaker mechanism (4-2), the sealing cover comprises a left sealing cover (4-8) and a right sealing cover (4-3), the left sealing cover (4-8) and the right sealing cover (4-2) are connected through a flange, a second sealing gasket (4-5) is installed to realize sealing connection, a front transparent sealing plate (4-7) is installed on the left end face of the left sealing cover (4-8), and a third sealing gasket (4-6) is installed to realize sealing connection, and a first sealing gasket (4-4) is arranged on the right end surface of the right end sealing cover (4-3) to realize sealing connection with the upper air box (29).
6. The 72.5kV ring main unit special for offshore wind power as claimed in claim 1 or 2, wherein the upper welding box body (3) and the lower welding box body (5) are airtight box bodies formed by laser welding stainless steel plates.
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| CN202110598106.6A CN113422318B (en) | 2021-05-31 | 2021-05-31 | 72.5KV ring main unit special for offshore wind power |
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| CN202110598106.6A CN113422318B (en) | 2021-05-31 | 2021-05-31 | 72.5KV ring main unit special for offshore wind power |
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| CN113422318B CN113422318B (en) | 2024-08-20 |
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Cited By (1)
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| CN113422318B (en) | 2024-08-20 |
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