Follow-up Contact System and Gas Insulated High-Voltage Equipment

Abstract

The present invention provides a follow-up contact system and a gas-insulated high-voltage device, which relate to the field of high-voltage power transmission and distribution. The follow-up contact system includes: a contact, a contact base, and a plug. The contact base is electrically connected to a first conductor, and the plug is electrically connected to a second conductor. The contact is disposed within the contact base. The contact includes a plurality of contact piece units, and each contact piece unit includes a conductive contact piece and a spring piece. One end of the conductive contact piece is connected to one end of the spring piece. The other end of each spring piece is connected to a fixed ring, and the plurality of spring pieces are uniformly arranged along the fixed ring. Each conductive contact piece is fixedly connected to a limiting ring, and the plurality of conductive contact pieces are uniformly arranged along the limiting ring. When the plug is inserted into the contact from one end of the fixed ring, the first conductor and the second conductor are electrically connected through the contact, the contact base, and the plug. The situation where the contact is damaged or burned out when a conductor rotation angle is generated between the two conductors, thereby causing damage to the high-voltage device, is reduced, thus improving the operation reliability of the entire high-voltage device.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission and distribution, and in particular to a follower contact system and a gas-insulated high-voltage device. Background Art

[0002] Gas-insulated high-voltage equipment consists of a grounded metal casing, a conductor through which high-voltage current flows, and an insulator that supports the conductor and insulates the conductor from the grounded casing. The metal casing is filled with SF6 gas or SF6 mixed gas. Since high-voltage equipment needs to connect different devices and the distances between the devices are different, the conductors need to be manufactured in sections. In order to ensure that the two conductors are reliably connected and pass large currents, there are currently three ways to connect the conductors: one is to weld the two conductors; one is to press the two conductors together with bolts; and the other is to connect the two conductors by adding a contact for transition current between the two conductors.

[0003] In the prior art, the conductors in gas-insulated high-voltage equipment are mostly round conductors with small volumes and require relatively large currents to pass through, so contact connections are often used to connect the conductors.

[0004] However, when the conductor is very long, or when the conductor expands and contracts due to temperature changes during equipment operation, the axis between the two conductors will change, resulting in a conductor rotation angle. When the existing contacts generate a conductor rotation angle between the two conductors, the contacts may be damaged or burned, thereby causing damage to the high-voltage equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a follower contact system and a gas-insulated high-voltage device to address the deficiencies in the above-mentioned prior art, so as to solve the problem that when a conductor rotation angle is generated between two conductors, the contact may be damaged or burned, thereby causing damage to the high-voltage device.

[0006] To achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0007] In the first aspect, an embodiment of the present invention provides a follower contact system, including: a contact, a contact seat, and a plug, wherein the contact seat is electrically connected to a first conductor, the plug is electrically connected to a second conductor, the contact is disposed in the contact seat, the contact includes a plurality of contact units, the contact unit includes a conductive contact and a spring sheet, and one end of the conductive contact is connected to one end of the spring sheet. The other end of each spring sheet is connected to a fixed ring, and a plurality of spring sheets are evenly arranged along the fixed ring, each conductive contact is fixedly connected to a limiting ring, and a plurality of conductive contacts are evenly arranged along the limiting ring. When the plug is inserted into the contact from one end of the fixed ring, the first conductor and the second conductor are electrically connected through the contact, the contact seat, and the plug.

[0008] Optionally, the conductive contact piece is a trapezoidal stretched structure, the top surface is an arc-shaped short side tangent to the two waist surfaces, the bottom surface and the two waist surfaces are a stretching plane with a smooth transition, the top surface is used to abut against the plug, and the bottom surface abuts against the contact seat.

[0009] Optionally, the conductive contact piece is provided with a through hole, and the limiting ring passes through the through hole on each conductive contact piece to fix and connect the multiple conductive contact pieces.

[0010] Optionally, the fixing ring comprises: an inner ring and an outer ring. The inner ring is sleeved inside the outer ring, and one end of the spring sheet connected to the fixing ring is clamped between the inner ring and the outer ring.

[0011] In a second aspect, an embodiment of the present invention further provides a gas-insulated high-voltage device, in which at least two conductors in the gas-insulated high-voltage device are connected via the follower contact system provided in the first aspect.

[0012] The beneficial effects of the present invention are as follows: when there is a certain conductor rotation angle between the contact seat conductor and the plug conductor, the spring pieces of each conductive contact piece of the contact rotate with the plug conductor, so that the fixing ring of the fixed spring piece always maintains a concentric state with the plug conductor, and ensures that the pressure of each conductive contact piece in the contact on the conductor is equal, the current flowing through each conductive contact piece is always equal, and the temperature rise of each part of the contact is always equal, so that the performance of the contact is best exerted. When the conductor rotation angle is generated between the two conductors, the contact is damaged or burned, which leads to damage to the high-voltage equipment, thereby improving the operating reliability of the entire high-voltage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic structural diagram of a follower contact system provided in one embodiment of the present invention;

[0015] Figure 2 A schematic diagram of the structure of a contact provided by an embodiment of the present invention;

[0016] Figure 3 A schematic diagram of the structure of a contact unit in a contact provided by an embodiment of the present invention;

[0017] Figure 4 A schematic diagram of the structure of a conductive contact in a contact unit provided in an embodiment of the present invention;

[0018] Figure 5A schematic diagram of the structure of a fixing ring in a contact unit provided in an embodiment of the present invention.

[0019] Icon: 01-contact seat; 02-plug; 1-conductive contact; 2-spring sheet; 3-fixing ring; 31-inner ring; 32-outer ring; 4-limiting ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Figure 1 A schematic diagram of the structure of a follower contact system provided in one embodiment of the present invention, Figure 2 A schematic diagram of the structure of a contact provided by an embodiment of the present invention, Figure 3 A schematic diagram of the structure of a contact unit in a contact provided by an embodiment of the present invention.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, the follower contact system includes: a contact, a contact seat 01, and a plug 02. The contact seat 01 is electrically connected to the first conductor, and the plug 02 is electrically connected to the second conductor. The contact is arranged in the contact seat 01. The contact includes a plurality of contact units. The contact unit includes a conductive contact 1 and a spring sheet 2. One end of the conductive contact 1 is connected to one end of the spring sheet 2. The other end of each spring sheet 2 is connected to a fixing ring 3. A plurality of spring sheets 2 are evenly arranged along the fixing ring 3. Each conductive contact 1 is fixedly connected to a limiting ring 4. A plurality of conductive contacts 1 are evenly arranged along the limiting ring 4. When the plug 02 is inserted into the contact from one end of the fixing ring 3, the first conductor and the second conductor are electrically connected through the contact, the contact seat 01, and the plug 02.

[0028] A cylindrical hole is opened on the first conductor, and the contact is installed in the cylindrical hole. This cylindrical hole is the contact seat 01. The diameter of the cylindrical hole should be larger than the outer diameter of the outer ring 32 of the fixing ring 3, and also larger than the overall diameter of the contact, so as to ensure that the fixing ring 3 has a certain range of motion.

[0029] In addition, the plug 02 is usually composed of two parts, one is an insertion part with a smaller diameter for inserting the contact, and the other is a second conductor with a larger diameter. The two parts can be integrally formed, and there can also be a transition part between the two parts.

[0030] In some embodiments, the contact is composed of a plurality of identical contact units (conductive contact 1 and spring sheet 2) uniformly placed along a circumference of a certain diameter, each contact unit is composed of a conductive contact 1 and a spring sheet 2 connected to the conductive contact 1 at one end, all conductive contact sheets 1 are limited by a circular limiting ring 4, and the other ends of all spring sheets 2 are fixed by a circular fixing ring 3. The conductive contact 1 and the spring sheet 2 in the contact unit are mechanically connected. The conductive contact 1 is silver-plated on copper or copper alloy. The spring sheet 2 is a plate spring, the purpose of which is to increase the pressure on the conductive contact 1. Multiple contact units are evenly arranged along the circular ring, the top surface DD forms a circular ring ΦINNER with a small diameter, and the bottom surface AA forms a circular ring ΦOUTER with a large diameter. Different numbers of contact units can be configured according to the size of the current passing through, and the number of contact units determines the size of the diameter ΦOUTER of the entire contact. If the current that needs to pass through the contact is large, a larger number of contact units are required, so that the diameter ΦOUTER of the entire contact is large.

[0031] In this embodiment, when there is a certain conductor rotation angle between the contact seat conductor and the plug conductor, the spring pieces of each conductive contact piece of the contact rotate with the plug conductor, so that the fixing ring that fixes the spring piece always remains concentric with the plug conductor. The fixing ring and the plug remain concentric, so that the spring pieces of each conductive contact piece of the contact maintain the same pressure, so that the current flowing through each conductive contact piece remains equal. This form of movement is called follow-up movement, and this contact structure is a follow-up contact structure. Since the pressure of each conductive contact piece on the conductor in the follow-up contact structure is equal, the current flowing through each conductive contact piece is always equal; the temperature rise of each part of the contact is always equal, so that the performance of the contact is best exerted. When a conductor rotation angle is generated between the two conductors, the contact is damaged or burned, which in turn causes damage to the high-voltage equipment, thereby improving the operating reliability of the entire high-voltage equipment.

[0032] Figure 4 A schematic diagram of the structure of a conductive contact in a contact unit provided in an embodiment of the present invention.

[0033] Alternatively, if Figure 4 As shown, the conductive contact piece 1 is a trapezoidal tensile structure, the top surface DD is an arc-shaped short side tangent to the two waist surfaces (BB and CC), the bottom surface AA and the two waist surfaces (BB and CC) are a smoothly transitioned tensile plane, the top surface DD is used to abut against the plug 02, and the bottom surface AA abuts against the contact seat 01.

[0034] The conductive contact piece 1 is a trapezoidal tensile structure that is small at the top and large at the bottom. The top surface DD is an arc-shaped short side tangent to the two waist surfaces (BB, CC), and the bottom surface AA is a tensile plane with smooth transitions at the two vertices; the two surfaces in contact with the conductor are the arc-shaped top surface DD and the bottom surface AA. The two waist surfaces (BB, CC) of the trapezoidal structure are planes or arc surfaces with large radius, which are designed to reduce the resistance of the contact to the plug 02 when the plug 02 is plugged into the contact seat 01. The waist surface BB forms an angle A1 with the bottom surface AA, and the waist surface CC forms an angle A2 with the bottom surface AA; the angles A1 and A2 can be equal or unequal. When the angle is small, the resistance of the contact to the plug 02 is small when the plug 02 is plugged in, and vice versa. When the trapezoidal waist surface (BB, CC) is a large radius arc, this angle is the angle between the chord of the arc and the bottom surface AA of the contact piece.

[0035] The arc-shaped top surface DD on the conductive contact piece 1 that is tangent to the two waist surfaces (BB, CC) is to ensure that when the inserted plug 02 swings radially, the conductive contact piece 1 is always in line contact with the plug 02, thereby improving the current carrying capacity.

[0036] Optionally, the conductive contact 1 and the spring piece 2 in the contact unit are mechanically connected, and a conductive contact slot EE is provided at one end of the conductive contact 1 for inserting the spring piece 2 so that the conductive contact 1 and the spring piece 2 are mechanically connected.

[0037] Optionally, refer to Figure 4 The conductive contact piece 1 is provided with a through hole, and the limiting ring 4 passes through the through hole on each conductive contact piece 1 to fix and connect the multiple conductive contact pieces 1.

[0038] In some implementations, the limiting ring 4 of the conductive contact piece 1 passes through the hole FF on the trapezoidal surface of the conductive contact piece 1 , and the limiting ring 4 is not allowed to exceed the range of the top surface DD and the bottom surface AA of the conductive contact piece 1 .

[0039] The opening FF on the conductive contact piece 1 may be an incomplete circular hole, which is opened on a waist surface BB or CC of the contact piece that does not need to be plugged with a conductor, and is used to place the limiting ring 4. Alternatively, the limiting ring 4 may be an open ring or a closed ring, which is not limited here.

[0040] It should be noted that the cross-section of the opening FF on the conductive contact piece 1 and the limiting ring 4 can be circular, square or polygonal, and the specific shape is not limited.

[0041] Figure 5 A schematic diagram of the structure of a fixing ring in a contact unit provided in an embodiment of the present invention.

[0042] Alternatively, if Figure 5 As shown, the fixing ring includes: an inner ring 31 and an outer ring 32. The inner ring 31 is sleeved in the outer ring 32, and one end of the spring sheet 2 connected to the fixing ring 3 is clamped between the inner ring 31 and the outer ring 32.

[0043] The fixing ring 3 is composed of two nested inner rings 31 and outer rings 32. The inner ring 31 and the outer ring 32 fix the spring sheet 2 in the middle. There is a certain movable gap between the inner ring 31 and the outer ring 32 to ensure that the spring 2 does not fall out of the gap between the inner ring 31 and the outer ring 32, and can also move slightly.

[0044] After the spring 2 is fixed, the spring 2 cannot be pulled out without damaging the inner ring 31 or the outer ring 32. This structure can ensure the structural stability of the entire contact 00.

[0045] When the plug 02 and the contact seat 01 have a certain deflection angle Da, the pressure on the lower conductive contact C low of the contact is greater than the force on the upper conductive contact C up of the contact, and the gap Dsh between the fixing ring 3 connecting the spring piece 2 of the lower conductive contact C low and the surface of the contact seat is smaller than the gap D1a between the fixing ring 3 connecting the spring piece 2 of the upper conductive contact C up and the surface of the contact seat. From the front planing surface of the contact seat 01, at this time, the spring piece 2 connecting the lower conductive contact C low is under pressure, while the spring piece 2 of the upper conductive contact C up is under tension. The spring piece 2 and the fixing ring 31 form a combination, and the fixing ring 31 / 32 can move freely in the contact seat. In this way, the fixing ring 3 of the contact will change its position so that the spring forces on the upper and lower parts of the fixing ring 3 are equal. The fixing ring 3 will eventually stop in a concentric circle state with the plug conductor 02. At this time, the forces acting on the upper and lower conductive contacts Cup and C low by the spring remain equal. By the same principle, the forces on the conductive contact pieces 1 at various locations of the contact always remain equal.

[0046] In some embodiments, the fixing ring 3 for fixing the spring sheet 2 mechanically fixes one end of the spring sheet 2, and the inner diameter Φring of the inner ring 31 of the fixing ring 3 is larger than the diameter ΦINNER of the circle formed after the trapezoidal top surface DD of the conductive contact sheet 1 is placed; the outer diameter of the outer ring 32 of the fixing ring 3 is smaller than or equal to the diameter ΦOUTER of the circle formed by the bottom surface AA.

[0047] In some embodiments, when the conductor rotation angle Da is too large, since the conductive contact 1 on one side of the contact 02 will contact the contact seat 01, the fixing ring 3 does not have enough space to adjust to be concentric with the plug 02. At this time, the trapezoidal shape design of the conductive contact is used to eliminate the pressure imbalance on the conductive contact 1 caused by the deflection of the plug 02. Because there is still a large gap between the plug 02 and the inner ring 31 of the fixing ring 3, the assembly form between the spring sheet 2 and the inner ring 31 of the fixing ring 3 can still ensure the pressure balance of each contact.

[0048] When in use, the contact is installed in the contact seat 01. When the plug 02 is inserted, the current flows from the second conductor through the plug 02 into the conductive contact piece 1 of the contact. The current first flows through the top surface DD and the bottom surface AA of the conductive contact piece 1 in the conductive contact piece 1, and finally flows into the contact seat 01, and then flows out from the first conductor to complete the current conduction.

[0049] In another possible implementation, in order to obtain a large current capacity, for example, more than 6000A, it is necessary to limit the gap between the contact base 01 and the contact, for example, usually less than 2 mm. In this way, when the fixing ring of the contact contacts the cylindrical surface of the contact base 01, the rotation angle Da of the contact base conductor 01 and the plug conductor is less than 2.5 degrees.

[0050] When the conductor rotation angle Da is greater than between 2.5 and 5 degrees, since the AA surface of the contact piece on one side of the contact will contact the contact seat 01, the fixing ring 3 does not have enough space to adjust to be concentric with the plug 02. At this time, the trapezoidal shape design of the contact itself is used to eliminate the pressure imbalance on the lower conductive contact piece 1 caused by the deflection of the plug 02. Because there is still a large gap between the plug 02 and the inner ring 31 of the fixing ring, the assembly form between the spring 2 and the inner ring can still ensure the pressure balance of each contact piece.

[0051] An embodiment of the present invention further provides a gas-insulated high-voltage device, in which at least two conductors in the gas-insulated high-voltage device are connected via the follower contact system provided in the first aspect.

[0052] Since the gas-insulated high-voltage equipment uses the above-mentioned follower contact system, its implementation method and beneficial effects are the same as those of the above-mentioned equipment and will not be described in detail here.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A follow-up contact system, comprising: a contact, a contact seat, and a plug. The contact seat is electrically connected to a first conductor, and the plug is electrically connected to a second conductor. It is characterized in that the contact is arranged in the contact seat. The contact includes a plurality of contact piece units. Each contact piece unit includes a conductive contact piece and a spring piece. One end of the conductive contact piece is connected to one end of the spring piece; the other end of each spring piece is connected to a fixing ring. The plurality of spring pieces are evenly arranged along the fixing ring. Each conductive contact piece is fixedly connected to a limiting ring. The plurality of conductive contact pieces are evenly arranged along the limiting ring; when the plug is inserted into the contact from one end of the fixing ring, the first conductor and the second conductor are electrically connected through the contact, the contact seat, and the plug; the fixing ring includes: an inner ring and an outer ring; the inner ring is sleeved inside the outer ring, and one end of the spring piece connected to the fixing ring is clamped between the inner ring and the outer ring.

2. The follow-up contact system according to claim 1, characterized in that the conductive contact piece is a trapezoidal stretched structure body. The top surface is an arc-shaped short side tangent to the two waist surfaces. The bottom surface and the two waist surfaces are in smooth transition with a stretched plane. The top surface is used to abut against the plug, and the bottom surface abuts against the contact seat.

3. The follow-up contact system according to claim 1, characterized in that the conductive contact piece is provided with a through hole, and the limiting ring passes through the through holes on each conductive contact piece to fixedly connect the plurality of conductive contact pieces.

4. A gas-insulated high-voltage device, characterized in that when at least two conductors in the gas-insulated high-voltage device are connected, they are connected through the follow-up contact system according to any one of claims 1-3.

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