阅读说明：本技术 一种中心载流导杆及高压输电设备 (Center current-carrying guide rod and high-voltage power transmission equipment ) 是由 田汇冬 王青于 靳守锋 刘鹏 彭宗仁 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种中心载流导杆及高压输电设备,中心载流导杆包括载流导杆母头和载流导杆公头,载流导杆母头和载流导杆公头之间在它们的连接部位设有第一绝缘垫圈和第二绝缘垫圈,第一绝缘垫圈、载流导杆母头、第二绝缘垫圈和载流导杆公头之间形成有密封腔室,所述密封腔室内填充有液态金属。所述液态金属在中心载流导杆使用工况下为液态。本发明通过利用液态金属代替触指结构,从而改善载流结构电接触性能。(The invention discloses a central current-carrying guide rod and high-voltage power transmission equipment, wherein the central current-carrying guide rod comprises a current-carrying guide rod female head and a current-carrying guide rod male head, a first insulating gasket and a second insulating gasket are arranged between the current-carrying guide rod female head and the current-carrying guide rod male head at the connecting part of 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. The invention improves the electric contact performance of the current-carrying structure by replacing the contact finger structure with liquid metal.)

1. The utility model provides a central current-carrying guide rod, its characterized in that, includes female head of current-carrying guide rod (1) and the public head of current-carrying guide rod (2), is equipped with first insulating washer (3) and second insulating washer (4) at their junction between female head of current-carrying guide rod (1) and the public head of current-carrying guide rod (2), is formed with sealed cavity (5) between first insulating washer (3), female head of current-carrying guide rod (1), second insulating washer (4) and the public head of current-carrying guide rod (2), sealed cavity (5) intussuseption is filled with liquid metal.

2. The central current-carrying guide rod according to claim 1, wherein one end of the female current-carrying guide rod head (1) is sleeved outside one end of the male current-carrying guide rod head (2), the first insulating washer (3) and the second insulating washer (4) are sleeved at the end of the male current-carrying guide rod head (2), and the first insulating washer (3) and the second insulating washer (4) are in interference fit with the female current-carrying guide rod head (1) and the male current-carrying guide rod head (2).

3. The central current-carrying guide rod according to claim 2, 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).

4. A central current-carrying rod according to any one of claims 1 to 3, 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.

5. A central current-carrying conductor according to claim 4, 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.

6. The center current-carrying rod of claim 4, wherein the liquid metal is gallium, indium, tin, or bismuth.

7. The central current-carrying guide rod according to claim 1, further comprising a shielding case (8), wherein the shielding case (8) is disposed in the limiting region of the current-carrying guide rod female head (1) and the current-carrying guide rod male head (2).

8. A central current-carrying conductor according to claim 7, characterized in that a copper-graphite contact (9) is arranged between the shielding can (8) and the male head (2) of the current-carrying conductor, a groove for mounting the copper-graphite contact (9) is arranged on the male head (2) of the current-carrying conductor, the copper-graphite contact (9) is arranged in the groove along the radial inner side of the copper-graphite contact, the copper-graphite contact (9) is in contact with the shielding can (8) along the radial outer side of the copper-graphite contact, and a groove for the outer side of the copper-graphite contact (9) to extend into is arranged on the shielding can (8).

9. The central current-carrying guide rod according to claim 7, wherein a bearing (7) is arranged between the 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).

10. A high voltage power transmission apparatus incorporating a central current carrying conductor according to any one of claims 1 to 9.

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, the discharge accidents caused by the electrical contact failure of the current-carrying connecting structure in the wall bushing account for 22 percent 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 current-carrying guide rod male head 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, the liquid metal is gallium, indium, tin or bismuth.

Preferably, the central current-carrying guide rod further comprises a shielding cover, and the shielding cover is arranged in the limiting regions 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 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 current-carrying guide rod female head and the current-carrying guide rod male head.

Drawings

FIG. 1 is a schematic view of the structure of the central current-carrying guide rod of 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 working 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 the first insulating washer 3 and the second insulating washer 4 to be embedded.

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, the first insulating gasket 3 and/or the second insulating gasket 4 are made of teflon insulating gaskets, and the insert 6 is made of teflon insert.

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 2, a groove for mounting the copper graphite contact 9 is disposed on the current-carrying guide rod male 2, the copper graphite contact 9 is disposed in the groove along the radial inner side thereof, the copper graphite contact 9 is in contact with the shielding case 8 along the radial outer side thereof, and a groove for the outer side of the copper graphite contact 9 to extend into is disposed on the shielding case 8.

As a preferred 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 properties, 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 female head, the liquid metal with the element content ratio completed is filled into the sealed cavity, the flow speed is kept stable, and after the filling is finished, the insulating insert 6 is embedded into the filling hole on the guide rod female 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 chamber 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 electric connection structures of large-scale electric power equipment such as a sleeve and a GIL.