CN113745870B - Center current-carrying guide rod and high-voltage power transmission equipment - Google Patents
Center current-carrying guide rod and high-voltage power transmission equipment Download PDFInfo
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- CN113745870B CN113745870B CN202110977689.3A CN202110977689A CN113745870B CN 113745870 B CN113745870 B CN 113745870B CN 202110977689 A CN202110977689 A CN 202110977689A CN 113745870 B CN113745870 B CN 113745870B
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- current
- guide rod
- carrying guide
- carrying
- head
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/005—Electrical coupling combined with fluidic coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
- H01R13/6581—Shield structure
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Abstract
The invention discloses a central current-carrying guide rod and high-voltage transmission equipment, wherein the central current-carrying guide rod comprises a female head of the current-carrying guide rod and a male head of the current-carrying guide rod, a first insulating gasket and a second insulating gasket are arranged between the female head of the current-carrying guide rod and the male head of the current-carrying guide rod at the connecting part of the female head of the current-carrying guide rod and the male head of the current-carrying guide rod, a sealing cavity is formed among the first insulating gasket, the female head of the current-carrying guide rod, the second insulating gasket and the male head of the current-carrying guide rod, and liquid metal is filled in the sealing cavity. The liquid metal is liquid under the use working condition of the central current-carrying guide rod. The invention improves the electric contact performance of the current-carrying structure by replacing the contact finger structure with liquid metal.
Description
Technical Field
The invention belongs to the field of electric contact, and particularly relates to a central current-carrying guide rod and high-voltage power transmission equipment for large-scale power equipment.
Background
In high-voltage power transmission equipment, the central current-carrying guide rod is subjected to current-carrying transition by adopting an electric connection structure due to the reasons of large size and the like. The design of the electrical connection structure not only needs to consider the soaking heat dissipation characteristic of the whole structure, but also needs to consider how the mechanical stress of the current-carrying system is released when the system peak shaving or the ring temperature changes cause thermal expansion and cold contraction. The contact material has mechanical phenomena such as mutual friction, material softening, tension deformation and the like in reciprocating motion, a series of electrical phenomena such as Joule heat and the like, and chemical phenomena such as environmental corrosion and the like, and the physical phenomena have complex interaction with each other. Taking the casing as an example, the current-carrying structure part mostly adopts spring contact fingers, watchband contact fingers and plum blossom contact fingers to carry out electrical connection, and the basic requirements of electrical contact can be summarized as follows: the heat-conducting and heat-conducting alloy has good heat-conducting and electricity-conducting performance and lower contact resistance and temperature rise, can resist fusion welding, abrasion and corrosion, and can adapt to special working conditions such as short-circuit current, arcing and the like.
The existing contact finger type current-carrying structure is complex, the problems of few contacts, small contact area, large deflection angle and the like exist in the actual operation working condition, and a large amount of metal scraps can be generated under the action of thermal stress and mechanical stress. The above conditions can cause poor contact, cause temperature rise of contacts to be increased violently, cause local overheating faults of electric equipment such as a sleeve and the like, finally cause equipment discharge, and threaten safe and stable operation of an electric power system. At present, discharge accidents caused by electrical contact failure of a current-carrying connecting structure in the wall bushing account for 22% of the faults of the wall bushing. In addition, the internal current carrying connection structure of high voltage electrical equipment such as GIS and GIL has the above-mentioned problem. Therefore, there is a high demand for the design and selection of the electrical connection structure of large-scale power equipment.
Disclosure of Invention
The invention aims to provide a central current-carrying guide rod and high-voltage power transmission equipment, aiming at solving the problem of poor contact of a contact finger type current-carrying structure in high-voltage power transmission equipment such as a sleeve.
The technical scheme adopted by the invention is as follows:
a central current-carrying guide rod comprises a current-carrying guide rod female head and a current-carrying guide rod male head, wherein a first insulating gasket and a second insulating gasket are arranged at the connecting part between the current-carrying guide rod female head and the current-carrying guide rod male head, a sealing cavity is formed among the first insulating gasket, the current-carrying guide rod female head, the second insulating gasket and the current-carrying guide rod male head, and liquid metal is filled in the sealing cavity. The liquid metal is liquid under the use working condition of the central current-carrying guide rod.
Preferably, one end of the female head of the current-carrying guide rod is sleeved outside one end of the male head of the current-carrying guide rod, the first insulating washer and the second insulating washer are sleeved at the end part of the male head of the current-carrying guide rod, and the first insulating washer and the second insulating washer are in interference fit with the female head of the current-carrying guide rod and the male head of the current-carrying guide rod.
Preferably, the outer surface of the male head of the current-carrying guide rod is provided with a groove for embedding the first insulating gasket and the second insulating gasket.
Preferably, a liquid metal injection hole is formed in the current-carrying guide rod female head, and an insert used for sealing the liquid metal injection hole is arranged in the liquid metal injection hole.
Preferably, the first insulating gasket and/or the second insulating gasket are polytetrafluoroethylene insulating gaskets, and the insert is a polytetrafluoroethylene insert.
Preferably, gallium, indium, tin or bismuth is used as the liquid metal.
Preferably, the central current-carrying guide rod further comprises a shielding cover, and the shielding cover is arranged in the limiting region of the female head of the current-carrying guide rod and the male head of the current-carrying guide rod.
Preferably, a copper graphite contact is arranged between the shielding case and the current-carrying guide rod male head, a groove for mounting the copper graphite contact is arranged on the current-carrying guide rod male head, the copper graphite contact is arranged in the groove along the radial inner side of the copper graphite contact, the copper graphite contact is contacted with the shielding case along the radial outer side of the copper graphite contact, and a groove for the outer side of the copper graphite contact to stretch into is arranged on the shielding case.
Preferably, a bearing is arranged between the shielding case and the current-carrying guide rod female head, an inner ring of the bearing is arranged on the current-carrying guide rod female head, an outer ring of the bearing is arranged on the shielding case, and a groove for mounting the bearing is formed in the shielding case.
The invention also provides high-voltage power transmission equipment, wherein the high-voltage power transmission equipment is provided with the central current-carrying guide rod, and the central current-carrying guide rod adopts the central current-carrying guide rod.
The invention has the following beneficial effects:
according to the invention, the liquid metal is filled in the sealed cavity formed among the first insulating gasket, the current-carrying guide rod female head, the second insulating gasket and the current-carrying guide rod male head, and the current-carrying connecting structure is filled with the liquid metal, so that a contact finger type structure can be replaced. On the other hand, the liquid metal has excellent lubricating property, reduces mechanical friction with the current-carrying guide rod, greatly avoids the generation of metal scraps, prevents discharge faults caused by metal particles, and can reduce the replacement frequency and the maintenance frequency of the electric connection structure.
Furthermore, the first insulating washer and/or the second insulating washer are/is made of polytetrafluoroethylene insulating washers, so that the first insulating washer and/or the second insulating washer can adapt to expansion with heat and contraction with cold of liquid metal, and the liquid metal is guaranteed to be always in effective contact with the female head of the current-carrying guide rod and the male head of the current-carrying guide rod.
Drawings
FIG. 1 is a schematic view of a core current-carrying guide bar according to the present invention.
In the figure, 1 is a current-carrying guide rod female head, 2 is a current-carrying guide rod male head, 3 is a first insulating gasket, 4 is a second insulating gasket, 5 is a sealing cavity, 6 is an insert, 7 is a bearing, 8 is a shielding case, and 9 is a copper graphite contact.
Detailed Description
The invention will be further described with reference to the following figures and examples:
referring to fig. 1, the central current-carrying guide rod of the invention comprises a current-carrying guide rod female head 1 and a current-carrying guide rod male head 2, wherein a first insulating gasket 3 and a second insulating gasket 4 are arranged between the current-carrying guide rod female head 1 and the current-carrying guide rod male head 2 at the connection part of the current-carrying guide rod female head 1 and the current-carrying guide rod male head 2, a sealing chamber 5 is formed among the first insulating gasket 3, the current-carrying guide rod female head 1, the second insulating gasket 4 and the current-carrying guide rod male head 2, and liquid metal is filled in the sealing chamber 5. The liquid metal is liquid under the use condition of the central current-carrying guide rod.
As a preferred embodiment of the present invention, one end of the current-carrying guide rod female head 1 is sleeved outside one end of the current-carrying guide rod male head 2, the first insulating washer 3 and the second insulating washer 4 are sleeved at the end of the current-carrying guide rod male head 2, and the first insulating washer 3 and the second insulating washer 4 are in interference fit with the current-carrying guide rod female head 1 and the current-carrying guide rod male head 2.
As a preferred embodiment of the present invention, the outer surface of the current-carrying guide rod male 2 is provided with a groove for embedding the first insulating washer 3 and the second insulating washer 4.
In a preferred embodiment of the present invention, the current-carrying guide rod female head 1 is provided with a liquid metal injection hole, the liquid metal injection hole is provided with an insert 6 for sealing the liquid metal injection hole, and the insert 6 is made of metal, preferably the same metal as the current-carrying guide rod female head 1.
In a preferred embodiment of the present invention, a teflon insulating gasket is used as the first insulating gasket 3 and/or the second insulating gasket 4, and a teflon insert is used as the insert 6.
As preferred embodiments of the invention, gallium, indium, tin or bismuth are used as liquid metals.
As a preferred embodiment of the present invention, the central current-carrying guide rod further comprises a shielding cover 8, and the shielding cover 8 is disposed in the limiting regions of the current-carrying guide rod female head 1 and the current-carrying guide rod male head 2.
As a preferred embodiment of the present invention, a copper graphite contact 9 is disposed between the shielding case 8 and the current-carrying guide rod male head 2, a groove for mounting the copper graphite contact 9 is disposed on the current-carrying guide rod male head 2, the copper graphite contact 9 is disposed in the groove along the radial inner side thereof, the copper graphite contact 9 contacts the shielding case 8 along the radial outer side thereof, and the shielding case 8 is provided with a groove for the outer side of the copper graphite contact 9 to extend into.
As a preferable embodiment of the invention, a bearing 7 is arranged between a shielding case 8 and the current-carrying guide rod female head 1, an inner ring of the bearing 7 is arranged on the current-carrying guide rod female head 1, an outer ring of the bearing 7 is arranged on the shielding case 8, and a groove for mounting the bearing 7 is formed in the shielding case 8.
The invention also provides high-voltage power transmission equipment, wherein the high-voltage power transmission equipment is provided with the central current-carrying guide rod, and the central current-carrying guide rod adopts the central current-carrying guide rod.
Examples
In the center current-carrying guide rod of this embodiment, the first insulating washer 3 and the second insulating washer 4 are used to seal the electrical connection structure between the female head 1 of the current-carrying guide rod and the male head 2 of the current-carrying guide rod, as shown in fig. 1, an injection hole is formed in the female head 1 of the current-carrying guide rod, and liquid metal is injected into the sealed electrical connection structure (i.e., the sealed cavity 5 formed between the first insulating washer 3, the female head 1 of the current-carrying guide rod, the second insulating washer 4 and the male head 2 of the current-carrying guide rod) through the injection hole reserved in the female head 1 of the current-carrying guide rod, so as to completely fill the gap between the female head 1 of the current-carrying guide rod and the male head 2 of the current-carrying guide rod, and achieve the effect of current-carrying connection between the female head 1 of the current-carrying guide rod and the male head 2 of the current-carrying guide rod. The first insulating gasket 3 and the second insulating gasket 4 are fixed through the groove on the current-carrying guide rod male head 2, and the mechanical support and insulating sealing functions are achieved. The current-carrying guide rod female head 1 is provided with a detachable insert 6, and the insert 6 is used for sealing an injection hole on the current-carrying guide rod female head 1. The thickness of the first insulating washer 3 and the second insulating washer 4 is determined according to the actual requirements of the power equipment. A metallic shield 8 is fitted around the periphery of the electrical connection structure to act as an electromagnetic shield.
The first insulating gasket 3, the second insulating gasket 4 and the insulating insert 6 are made of polytetrafluoroethylene materials, are high-temperature resistant and corrosion resistant, and are ideal insulating materials. The metal material of the current-carrying conductor of the power equipment is selected according to the actual engineering, such as aluminum, copper and the like. The liquid metal is selected from liquid metals with adsorption characteristics, such as gallium, indium, tin, bismuth, and the like. Gallium indium alloys are preferred, which have higher electrical conductivity than other liquid metal alloys.
When the current-carrying connecting structure is assembled, the first insulating washer and the second insulating washer are assembled into the groove in the current-carrying guide rod male head 2, then the current-carrying guide rod male head 2 is inserted into the current-carrying guide rod female head 1, and the sealing cavity 5 is sealed. Through the filling hole on the guide rod box head, the liquid metal with the element content ratio completed is injected into the sealed cavity, the flow speed is kept stable, and after the injection is finished, the insulating insert 6 is embedded into the filling hole on the guide rod box head, so that the filling hole is sealed by the insert 6. And finally, mounting a shielding cover 8 in a limiting area of the current-carrying guide rod female head 1 and the current-carrying guide rod male head 2, wherein the shielding cover 8 is in contact connection with the current-carrying guide rod male head 2 through a graphite contact 9 and is connected with the current-carrying guide rod female head 1 through a bearing, and the shielding cover 8 is utilized to perform electrostatic shielding on the electric connection structure. The sealed cavity 5 replaces a contact finger type structure, has excellent lubricating performance and electric and thermal conductivity, and can meet the requirements of the design of an electric connection structure of large-scale electric power equipment such as a sleeve and a GIL.
Claims (8)
1. A central current-carrying guide rod is characterized by comprising a current-carrying guide rod female head (1) and a current-carrying guide rod male head (2), wherein a first insulating gasket (3) and a second insulating gasket (4) are arranged at the connecting part between the current-carrying guide rod female head (1) and the current-carrying guide rod male head (2), a sealing cavity (5) is formed among the first insulating gasket (3), the current-carrying guide rod female head (1), the second insulating gasket (4) and the current-carrying guide rod male head (2), and liquid metal is filled in the sealing cavity (5);
a gap is arranged between the current-carrying guide rod female head (1) and the current-carrying guide rod male head (2);
one end of the current-carrying guide rod female head (1) is sleeved outside one end of the current-carrying guide rod male head (2), the first insulating washer (3) and the second insulating washer (4) are sleeved at the end part of the current-carrying guide rod male head (2), and the first insulating washer (3), the second insulating washer (4) and the current-carrying guide rod female head (1) and the current-carrying guide rod male head (2) are in interference fit;
the central current-carrying guide rod further comprises a shielding cover (8), and the shielding cover (8) is arranged in the limiting regions of the female head (1) and the male head (2) of the current-carrying guide rod;
a bearing (7) is arranged between the shielding cover (8) and the current-carrying guide rod female head (1), the inner ring of the bearing (7) is installed on the current-carrying guide rod female head (1), and the outer ring of the bearing (7) is installed on the shielding cover (8).
2. The central current-carrying guide rod according to claim 1, wherein the outer surface of the male head (2) of the current-carrying guide rod is provided with a groove for embedding the first insulating washer (3) and the second insulating washer (4).
3. A central current-carrying rod according to any one of claims 1-2, wherein the female head (1) of the current-carrying rod is provided with a liquid metal injection hole, and the liquid metal injection hole is provided with an insert (6) for sealing the liquid metal injection hole.
4. A central current-carrying conductor according to claim 3, characterized in that the first insulating washer (3) and/or the second insulating washer (4) is a teflon insulating washer and the insert (6) is a teflon insert.
5. A central current-carrying guide according to claim 3, wherein the liquid metal is gallium, indium, tin or bismuth.
6. A central current-carrying conductor according to claim 1, characterized in that a copper graphite contact (9) is provided between the shielding can (8) and the male head (2) of the current-carrying conductor, the male head (2) of the current-carrying conductor is provided with a groove for mounting the copper graphite contact (9), the copper graphite contact (9) is provided in the groove along the radial inner side thereof, the copper graphite contact (9) is in contact with the shielding can (8) along the radial outer side thereof, and the shielding can (8) is provided with a groove for the outer side of the copper graphite contact (9) to extend into.
7. A central current-carrying conductor bar according to claim 1, characterised in that the screening can (8) is provided with a recess for mounting the bearing (7).
8. A high voltage power transmission apparatus incorporating a central current carrying conductor according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110977689.3A CN113745870B (en) | 2021-08-24 | 2021-08-24 | Center current-carrying guide rod and high-voltage power transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110977689.3A CN113745870B (en) | 2021-08-24 | 2021-08-24 | Center current-carrying guide rod and high-voltage power transmission equipment |
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| Publication Number | Publication Date |
|---|---|
| CN113745870A CN113745870A (en) | 2021-12-03 |
| CN113745870B true CN113745870B (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110977689.3A Active CN113745870B (en) | 2021-08-24 | 2021-08-24 | Center current-carrying guide rod and high-voltage power transmission equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2077286A1 (en) * | 1991-09-10 | 1993-03-11 | Tatsuo Chiyonobu | Electrical connecting method |
| CN207994541U (en) * | 2018-01-09 | 2018-10-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of current-carrying connection structure being exclusively used in HVDC Wall Bushing end |
| CN209823060U (en) * | 2019-04-29 | 2019-12-20 | 马龙云能投新能源开发有限公司 | Integrated form high accuracy fan unit sliding ring |
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| US7156690B2 (en) * | 2002-01-07 | 2007-01-02 | Bernard R Tolmie | Extruded connector without channel insulating layer |
| US8783735B2 (en) * | 2011-10-24 | 2014-07-22 | The Boeing Company | Conductance on hydraulic fittings using a soft metal interlayer |
| CN105632794B (en) * | 2016-03-02 | 2019-08-13 | 平高集团有限公司 | Arrangements of electric connection and its button contact base |
| CN107658668B (en) * | 2017-08-14 | 2019-06-18 | 云南靖创液态金属热控技术研发有限公司 | A kind of rotary conductive device |
| US11172717B2 (en) * | 2017-12-20 | 2021-11-16 | Romed Fasteners, Inc. | Magnetic fastener providing electrical connection and having female member with solid cover |
| CN209071783U (en) * | 2018-11-21 | 2019-07-05 | 云南科威液态金属谷研发有限公司 | A kind of liquid metal rotary electric connector |
| CN210344284U (en) * | 2019-07-22 | 2020-04-17 | 新乡市华航航空液压设备有限公司 | Mechanical sealing device of high-speed high-pressure hydraulic pump |
| CN212991334U (en) * | 2020-07-07 | 2021-04-16 | 国家电网有限公司 | Conductive connection structure, gas-insulated metal-enclosed switchgear and power transmission line |
| CN212934862U (en) * | 2020-08-12 | 2021-04-09 | 姚智慧 | Tower type liquid conducting ring |
| CN213906191U (en) * | 2020-12-23 | 2021-08-06 | 西安西电高压套管有限公司 | Direct current wall bushing |
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2021
- 2021-08-24 CN CN202110977689.3A patent/CN113745870B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2077286A1 (en) * | 1991-09-10 | 1993-03-11 | Tatsuo Chiyonobu | Electrical connecting method |
| CN207994541U (en) * | 2018-01-09 | 2018-10-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of current-carrying connection structure being exclusively used in HVDC Wall Bushing end |
| CN209823060U (en) * | 2019-04-29 | 2019-12-20 | 马龙云能投新能源开发有限公司 | Integrated form high accuracy fan unit sliding ring |
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| CN113745870A (en) | 2021-12-03 |
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