Moving contact for 550kV composite apparatus isolation switch
Through the integrated design of arc contact assembly and copper conductive rod, the friction and looseness problems at the connection of the isolating switch are solved, the connection strength and assembly efficiency are improved, and the stable operation of the power grid is ensured.
Patent Information
- Application Number
- CN202422278422.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The arc contacts and copper moving contacts of the existing 550kV combined electrical appliance isolation switch are recessed at the connection, causing the static side contact plate to transition friction, copper leakage, and the connection may be loose, affecting the flow capacity of the isolation switch and the safety of the grid.
The integrated design of arc contact assembly and copper conductive rod is adopted. Through the combination of arc grooves, external thread teeth, internal thread grooves and welding parts, the contacts and conductive rods are achieved, avoid friction and looseness, and improve connection strength.
It enhances the reliability of the isolating switch, reduces the hidden dangers of copper leakage and looseness, improves assembly efficiency and flow capacity, and ensures the safe and stable operation of the power grid.
Smart Images
Figure CN223079029U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of disconnectors, in particular to a moving contact for a 550 kV combined electrical apparatus disconnector. Background Art
[0002] In a 550 kV combined electrical apparatus, the disconnector is an important functional unit. The core part inside the disconnector is the moving contact, which mainly functions to conduct current and switch small capacitive currents. To meet the functional requirements of the disconnector, its moving contact usually consists of copper-tungsten resistant to ablation and a copper conductive rod. The existing disconnector mainly consists of two components: a copper-tungsten arc contact and a copper moving contact. When in use, after applying glue, the two parts are screwed together for integral use. Since there is a relationship of screw hole fit between the two, and there are inevitable outer diameter deviations between the two components, usually the edges of the two parts are chamfered to prevent the occurrence of sharp corners or misalignment.
[0003] However, this structure has the following disadvantages:
[0004] 1. Although chamfering treatments are respectively carried out on both the arc contact and the copper moving contact when they are fitted, a depression appears at the connection part. When the disconnector is switched on and off, the static side contact piece has to pass through this depression every time, resulting in excessive friction between the static side contact piece and the moving contact. After multiple switchings on and off, silver layer shedding and copper leakage of the contact piece occur, seriously affecting the rated current-carrying capacity of the disconnector.
[0005] 2. After applying glue, the copper-tungsten arc contact and the copper moving contact are connected through screw holes. In actual operation, due to the long-term current-carrying and heat generation of the conductor, the applied thread fastening glue may loosen under the condition of heat, leading to the hidden danger of loosening between the copper-tungsten arc contact and the copper moving contact, resulting in disconnector failures and affecting the safe and stable operation of the power grid. Content of the Utility Model
[0006] The purpose of the utility model is to propose a moving contact for a 550 kV combined electrical apparatus disconnector aiming at the problems existing in the background art.
[0007] The technical solution of the utility model: A moving contact for a 550 kV combined electrical apparatus disconnector includes an arc contact assembly. The arc contact assembly includes a contact and a connecting piece, and the contact is integrally connected with the connecting piece.
[0008] And a conductive rod, the conductive rod is integrally connected with the end of the connecting piece far away from the contact.
[0009] Preferably, an arc-shaped groove is arranged on the connecting piece, and the contact is located in the arc-shaped groove and fits with it.
[0010] Preferably, external thread teeth are arranged at the end of the connecting piece far away from the arc-shaped groove, and an internal thread groove is arranged at the end of the conductive rod close to the connecting piece. The connecting piece and the conductive rod are screwed together through the external thread teeth and the internal thread groove.
[0011] Preferably, chamfer A and chamfer B are respectively provided on the sides of the connecting member and the conductive rod close to each other, and a welding part is provided between the connecting member and the conductive rod to limit the relative movement of the connecting member and the conductive rod through the welding part and fill the groove formed by chamfer A and chamfer B.
[0012] Preferably, the outer surfaces of the contact, the connecting member, the conductive rod and the welding part are all smooth curved surfaces.
[0013] Compared with the prior art, the utility model has the following beneficial technical effects:
[0014] Through the integrated design of the arc contact component and the copper conductive rod, the hidden danger of friction and copper leakage of the static side contact piece during the opening and closing of the disconnector is avoided, and the connection strength between the arc contact and the copper conductive rod is improved, the falling-off risk is reduced, the reliability of the disconnector is improved. At the same time, this structure avoids the hidden danger of depression and looseness in the connection between the contact and the connecting member, improves the reliability of the disconnector, and also improves the assembly efficiency due to the reduction of the butt joint assembly link between the two. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of the utility model;
[0016] Figure 2 is an application scenario diagram of the utility model connected to the static contact piece side;
[0017] Figure 3 is a structural diagram of a traditional moving contact.
[0018] Reference numerals: 1, contact; 2, connecting member; 201, chamfer A; 3, conductive rod; 301, chamfer B; 4, welding part; 5, contact piece. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] As shown in the figure, a moving contact for a 550 kV combined electrical apparatus disconnector proposed by the utility model includes an arc contact component, and the arc contact component includes a contact 1 and a connecting member 2. An arc-shaped groove is provided on the connecting member 2, the contact 1 is located in the arc-shaped groove and fits with it, and the radian of the contact 1 is the same as that of the connecting member 2. Among them, the contact 1 is a copper-tungsten contact, the connecting member 2 is a chromium bronze, and the contact 1 and the connecting member 2 are sintered.
[0020] And a conductive rod 3, the conductive rod 3 is a copper conductive rod, the end of the connector 2 away from the arc groove is provided with external thread teeth, the end of the conductive rod 3 close to the connector 2 is provided with an internal thread groove, the connector 2 and the conductive rod 3 are screwed together through the external thread teeth and the internal thread groove, and the thread fastening glue is filled between the external thread teeth and the internal thread groove to pre-fix the connector 2 and the conductive rod 3. Chamfers A201 and B301 are respectively provided on the side where the connector 2 and the conductive rod 3 are close to each other, and a welding part 4 is provided between the connector 2 and the conductive rod 3 to limit the relative movement of the connector 2 and the conductive rod 3 through the welding part, and the groove formed by the chamfers A201 and B301 is filled, and the outer surfaces of the contact 1, the connector 2, the conductive rod 3 and the welding part 4 are all smooth curved surfaces.
[0021] In this embodiment, after the connector 2 and the conductive rod 3 are spirally connected, threaded fastener glue is applied, and torque is applied according to the technical requirements to ensure that the connector 2 and the conductive rod 3 are securely tightened, and welding is performed on the external butt surfaces of the connector 2 and the conductive rod 3 to ensure the connection strength and reduce the risk of the arc contact 5 and the copper conductive rod 3 falling off. During welding, the hardness will decrease within the range of ±5mm with the welding part 4 as the center. When the isolating switch is opened and closed, when the moving contact moves to the point where it just contacts the static side contact piece 5, the contact position just avoids the welding area, avoiding wear in the welding area. During the entire movement process, since the moving contact is designed as an integrated structure, the friction contact parts are all smooth structures, which avoids copper leakage caused by excessive friction of the static side contact piece 5, and ensures the current carrying capacity of the isolating switch.
[0022] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.
Claims
1. A moving contact for a disconnector of a 550 kV combined electrical apparatus, characterized in that, including an arc contact component, which includes a contact (1) and a connecting member (2), and the contact (1) is integrally connected to the connecting member (2); and a conductive rod (3), and the conductive rod (3) is integrally connected to one end of the connecting member (2) away from the contact (1).
2. The moving contact for the disconnector of the 550 kV combined electrical apparatus according to claim 1, wherein, An arc-shaped groove is provided on the connecting member (2), and the contact (1) is located in the arc-shaped groove and fits with it.
3. The moving contact for the disconnector of the 550 kV combined electrical apparatus according to claim 2, wherein External thread teeth are provided at one end of the connecting member (2) away from the arc-shaped groove, and an internal thread groove is provided at one end of the conductive rod (3) close to the connecting member (2). The connecting member (2) and the conductive rod (3) are screwed together through the external thread teeth and the internal thread groove.
4. The moving contact for the disconnector of the 550 kV combined electrical apparatus according to claim 3, characterized in that, Chamfer A (201) and chamfer B (301) are respectively provided on the sides of the connecting member (2) and the conductive rod (3) close to each other, and a welding part (4) is provided between the connecting member (2) and the conductive rod (3) to limit the relative movement of the connecting member (2) and the conductive rod (3) through the welding part and fill the groove formed by chamfer A (201) and chamfer B (301).
5. The moving contact for the disconnector of the 550 kV combined electrical apparatus according to claim 4, characterized in that, The outer surfaces of the contact (1), the connecting member (2), the conductive rod (3) and the welding part (4) are all smooth curved surfaces.