Four-break isolating switch
By connecting two double-break horizontally open isolation switches in series and adding an arc-induced device, four-break isolation switches are designed, which solves the demand for multiple fractures and current transfer capabilities of the power grid system, and achieves efficient electrical isolation and arc extinguishing.
Patent Information
- Application Number
- CN202411916712.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-04-15
AI Technical Summary
The existing dual-break horizontally open isolating switches cannot meet the demands of the power grid system for multiple breaks and current transfer capabilities of the isolating switches.
A four-broken isolation switch is designed, and two double-broken horizontally open isolation switches are connected in series, and an arc-induced device is added to the contact fingers to achieve the functions of multiple fractures and arc extinguishing.
The isolation of four fractures is achieved, the reliability of electrical isolation and arc extinguishing capability are improved, and the current transfer function needs in special scenarios of DC engineering are met.
Smart Images
Figure CN119833350A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of circuit emergency protection devices, and in particular to a four-break isolating switch. Background Art
[0002] An open-type disconnector, also known as a non-load transfer switch, is a switchgear that can disconnect and separate electrical equipment or lines. The structure of an open-type disconnector includes wiring terminals, moving contacts, static contacts, and other parts. Its basic principle is mainly based on mechanical connection to disconnect and connect current in the circuit. When the handle or operating lever of the disconnector is in the disconnected position, the contacts of the switch will form an insulation distance that meets the specified requirements and an obvious disconnection mark, and the current cannot pass through at this time; when the handle or operating lever is in the connected position, the contacts of the switch will close, allowing current to flow through. In addition, there are many types of open-type disconnectors, such as vertical telescopic type, horizontal rotation type, etc., and they are divided into indoor and outdoor types according to the working environment. The movable conductive rod of the indoor open-type disconnector opens or closes in the plane formed by the support insulators at both ends; the outdoor open-type disconnector is divided according to the number of support insulators, generally including single-column disconnectors, double-column disconnectors, three-column disconnectors, and V-type disconnectors.
[0003] Among them, the three-column horizontal opening isolating switch is widely used in high-voltage power systems, such as power plants, substations and other places. It can be used to isolate high-voltage circuits, change circuit connections or isolate lines from power sources to ensure the safe and stable operation of the power system. The three-column horizontal opening isolating switch has two rotatable contacts and two contact fingers that cooperate with the contacts. At this time, the three-column horizontal opening isolating switch has two disconnection points. This type of three-column horizontal opening isolating switch is also called a double-break horizontal opening isolating switch.
[0004] The double-break horizontal opening disconnector mainly includes contacts, contact fingers, support insulators, base, rotating seat and connecting rod. Three rotating seats are arranged on the base, the connecting rod is connected to the two ends of the rotating seat, the support insulator is installed on the rotating seat, and the two disconnection points are composed of two groups of contact fingers, of which two contact fingers are arranged on the support insulators at both ends, and two contacts are arranged on the middle support insulator. The operating mechanism drives the displacement of the connecting rod to drive the rotating seat to rotate 90° forward or reverse, thereby realizing the breaking and closing of the break. The double-break horizontal opening disconnector is usually used in high-voltage power systems, such as power plants, substations, etc., for the isolation and circuit-breaking operations of high-voltage transmission lines in and out. However, with the accelerated construction of DC transmission technology and new energy power grids, the existing double-break horizontal opening disconnector cannot meet the power grid system's requirements for multiple breaks and current transfer capabilities of the disconnector, so it is necessary to design a horizontal opening four-break open disconnector. Summary of the invention
[0005] The object of the present invention is to provide a four-break isolating switch to solve the problem that the existing double-break horizontal opening isolating switch cannot meet the demand of the power grid system for isolating switches with multiple breaks.
[0006] In order to solve the above problems, the four-break disconnector of the present invention adopts the following technical solutions: A four-break disconnector includes a double-break horizontal opening disconnector, the double-break horizontal opening disconnector includes a connecting rod transmission mechanism arranged below it, the connecting rod transmission mechanism is arranged on a base, the connecting rod transmission mechanism includes a rotating seat and a connecting rod, the connecting rod drives the rotating seat to rotate to realize the opening and closing operations of contacts and contact fingers arranged on the top of the support insulator on the rotating seat, the double-break horizontal opening disconnector is provided with two groups, the two double-break horizontal opening disconnectors are connected in series through a connecting device, the connecting rod transmission mechanisms of the two double-break horizontal opening disconnectors are connected through a transmission rod, one end of the transmission rod is connected to a rotating shaft, the rotating shaft is installed on an axle seat arranged on the side of any one of the bases and makes a circular motion with the axle seat as the center to drive the two connecting rod transmission mechanisms to move simultaneously through the transmission rod.
[0007] Furthermore, a connecting rod is provided on the transmission rod, and both ends of the connecting rod are respectively connected to a rotating seat under any contact finger of the two double-break horizontal opening isolating switches.
[0008] Furthermore, a protruding arm is provided on the rotating seat connected to the connecting rod so that the connecting rod can be connected to the rotating seat.
[0009] Furthermore, the connecting device includes a conductive plate, at least two of which are arranged opposite to each other on both sides of the poles provided on the contact fingers at both ends of the two double-break horizontal opening isolating switches and fixed by fasteners.
[0010] Furthermore, two conductive clamps are respectively provided on the inner side of the two conductive plates for respectively clamping the poles provided on the contact fingers at both ends of the two double-break horizontal opening isolating switches.
[0011] Furthermore, an arc striking device is provided between the corresponding contacts and contact fingers.
[0012] Furthermore, the arc-striking device comprises an arc-striking contact, an arc-striking rod and a fixing seat, and the arc-striking contact is connected to the fixing seat via the arc-striking rod.
[0013] Furthermore, the arc-striking rod is arranged in two sections, the two sections of the arc-striking rod are vertically connected and a clamp is provided at the connection to keep the two arc-striking rods in a vertical relationship.
[0014] Furthermore, one section of the arc striking rod is arranged parallel to the contact, and the other section is arranged perpendicular to the contact.
[0015] Furthermore, a torsion spring is provided in the fixing seat of the arc striking device to provide contact pressure for the arc striking contact.
[0016] Beneficial effects: The four-break disconnector of the present invention is an improved invention. Through this scheme, two double-break horizontal opening disconnectors are connected in series through a connecting device, and each double-break horizontal opening disconnector includes a base, a rotating seat, a connecting rod and a contact finger. The connecting rod transmission mechanism rotates through the rotating seat and the connecting rod on the base, thereby driving the contact fingers on the top of the support insulator to perform opening and closing operations. The connecting rod transmission mechanisms of the two sets of double-break horizontal opening disconnectors are connected through a transmission rod, and the rotating shaft connected to the transmission rod is installed on the shaft seat provided on the side of any base. The rotation of the rotating shaft drives the transmission rod and the connecting rod transmission mechanism connected to the transmission rod to ensure that the two sets of disconnectors can operate synchronously. Arc-starting devices are also provided on the contact fingers at both ends of each break to prevent the arc from damaging the contact fingers and other components. The four-break disconnector of the present invention meets the current transfer function in special scenarios of DC engineering by connecting two double-break horizontal opening disconnectors in series. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of an open state of a four-break disconnector according to an embodiment of the present invention; Figure 2 A schematic diagram of a closed state of an embodiment of a four-break disconnector of the present invention; Figure 3 It is a structural schematic diagram of the transmission part of an embodiment of a four-break disconnector of the present invention; Figure 4 A schematic structural diagram of a connecting device of an embodiment of a four-break disconnector of the present invention; Figure 5 The present invention is a schematic structural diagram of an arc striking device of an embodiment of a four-break disconnector of the present invention.
[0018] In the figure: 1. connecting device; 2. base; 3. rotating seat; 4. connecting rod; 5. contact; 6. contact finger; 7. support insulator; 8. transmission rod; 9. rotating shaft; 10. shaft seat; 11. arc-striking device; 12. connecting rod; 13. protruding arm; 14. conductive plate; 15. pole; 16. conductive clamp; 17. arc-striking contact; 18. arc-striking rod; 19. fixed seat; 20. clamp. DETAILED DESCRIPTION
[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.
[0020] The four-break disconnector of the present invention adopts a scheme of connecting two double-break horizontal opening disconnectors in series, and uses the principle that an additional disconnection point makes it easier to disperse and extinguish the arc when disconnecting the circuit, thereby increasing the number of disconnections of the disconnector to provide higher electrical isolation reliability and arc extinguishing capability, and meet the needs of special DC engineering. The four-break disconnector of the present invention also adopts a scheme of adding an arc-starting device to the contact fingers. When the disconnector is opened and closed, the arc-starting device closes before the contact fingers and opens after the contact fingers, ensuring that the arc generated during the opening and closing process of the switch device does not burn the contacts, effectively improving the current transfer capability of the disconnector.
[0021] As a basic solution, Figure 1 and Figure 2 As shown, the four-break disconnector of the present invention is formed by two groups of double-break horizontal opening disconnectors connected in series through a connecting device 1, and each group of double-break horizontal opening disconnectors includes a base 2, a rotating base 3, a connecting rod 4, a contact 5, a contact finger 6 and a support insulator 7. The rotating base 3 is installed on the base 2, and the connecting rod transmission mechanism rotates through the rotating base 3 and the connecting rod 4 on the base 2, thereby driving the contact 5 and the contact finger 6 on the top of the support insulator 7 to perform opening and closing operations. The contact 5 and the contact finger 6 are installed on the top of the support insulator 7 and are used to connect or disconnect with the circuit to achieve circuit isolation; the connecting rod transmission mechanisms of the two groups of double-break horizontal opening disconnectors are connected through a transmission rod 8, one end of the transmission rod 8 is connected to a rotating shaft 9, and the rotating shaft 9 is installed on an axle seat 10 provided on the side of any base 2. The rotating shaft 9 performs a circular motion with the axle seat as the center of the circle, thereby driving the two connecting rod transmission mechanisms connected to the transmission rod to ensure that the two groups of disconnectors can act synchronously. The four-break disconnector has four breaks. Compared with the traditional single-break or double-break disconnectors, it can isolate the circuit more effectively and improve the safety during maintenance. The two sets of double-break horizontal opening disconnectors are connected by the transmission rod 8 and can move synchronously, which enhances the stability of the entire disconnector. The structural design of the four-break disconnector can adapt to the circuit requirements of different voltage levels and current capacities.
[0022] As a preferred embodiment, Figure 3 As shown, the transmission rod 8 is provided with a connecting rod 12, and the two ends of the connecting rod 12 are respectively connected to the rotating seat 3 under any contact finger 6 of the two double-break horizontal opening type disconnectors. As a key component, the transmission rod 8 is connected to the rotating seats 3 of the two sets of double-break horizontal opening type disconnectors through the connecting rod 12. This connection method ensures that the two sets of disconnectors can act synchronously to realize the opening and closing operations of the contacts 5 and the contact fingers 6. At the same time, the design of the transmission rod 8 and the connecting rod 12 also ensures the stability and reliability of the connection of the entire disconnector structure.
[0023] As a preferred embodiment, the rotating seat 3 connected to the connecting rod 12 is provided with a protruding arm 13 so that the connecting rod 12 can be connected to the rotating seat 3. The connecting rod 12 is a connecting component between the transmission rod 8 and the rotating seat 3, and is connected to the rotating seat 3 through the protruding arm 13. This connection method not only ensures that the transmission rod 8 can smoothly drive the rotating seat 3 to rotate, but also enhances the stability and reliability of the connection. At the same time, the design of the protruding arm 13 also facilitates the installation and removal of the connecting rod 12, thereby improving the maintenance convenience of the entire disconnector.
[0024] As a preferred embodiment, Figure 4 As shown, the connection device 1 includes a conductive plate 14, at least two of which are arranged on the two sides of the pole 15 provided on the contact fingers 6 at both ends of the two double-break horizontal opening type disconnectors and fixed by fasteners. The connection device 1 serves as a connecting component between two groups of double-break horizontal opening type disconnectors, and realizes electrical connection through the conductive plate 14. At least two conductive plates 14 are arranged on the two sides of the pole 15 at both ends of the two groups of disconnectors, and fixed by fasteners. This connection method not only ensures the electrical connectivity between the two groups of disconnectors, but also provides a stable mechanical connection through fasteners, thereby enhancing the structural strength of the entire disconnector.
[0025] As a preferred embodiment, two conductive clamps 16 are respectively provided on the inner side of the two conductive plates 14, and the conductive clamps 16 provided on the inner side of the two conductive plates 14 jointly clamp the poles 15 provided on the contact fingers 6 at both ends of the two series-connected double-break horizontal opening type disconnectors. In the four-break disconnector, the conductive plate 14 is the main component of the connecting device 1, and is tightly connected to the pole 15 through the conductive clamp 16. The conductive clamp 16 is designed on the inner side of the conductive plate 14, two on each side, for fixing and clamping the pole 15, ensuring the electrical connection and mechanical stability between the conductive plate 14 and the pole 15. This connection method not only provides a reliable electrical path, but also enhances the structural strength of the entire disconnector. The design of the conductive clamp 16 ensures that the electrical connection between the conductive plate 14 and the pole 15 is tight and reliable, reducing the risk of failure caused by poor contact.
[0026] As a preferred embodiment, an arc striking device 11 is provided on the contact 5 and the contact finger 6. Figure 5 As shown, the main function of the arc striking device 11 is to guide and control the arc that may be generated when the disconnector is performing opening and closing operations, to prevent the arc from damaging the contacts 5, contact fingers 6 and other components, and to ensure the safe and reliable operation of the disconnector.
[0027] As a preferred embodiment, Figure 5As shown, the arc-striking device 11 includes an arc-striking contact 17, an arc-striking rod 18 and a fixed seat 19, and the arc-striking contact 17 is connected to the fixed seat 19 through the arc-striking rod 18. It is located at the front end of the arc-striking device 11 and directly contacts the contact 5 and the contact finger 6. When the disconnector performs the opening and closing operation, the arc-striking contact 17 will first contact the contact 5 and the contact finger 6 to guide the arc. The arc-striking rod 18 serves as a bridge connecting the arc-striking contact 17 and the fixed seat 19. The arc-striking rod 18 not only transmits the force generated by the arc, but also ensures that the arc can be guided to the fixed seat 19 along a predetermined path. The fixed seat 19 is fixed on the structure of the disconnector to provide support for the arc-striking contact 17 and the arc-striking rod 18. The design of the fixed seat 19 ensures that the arc-striking device 11 can work stably and prevents the arc from damaging other parts of the disconnector.
[0028] As a preferred embodiment, the arc-striking rod 18 is provided in two sections, and the two sections of the arc-striking rod 18 are vertically connected and provided with a clamp 20 at the connection. The two sections of the arc-striking rod 18 are vertically connected to form a whole, the first section of the arc-striking rod 18 is connected to the contact 5 and arranged in parallel with the contact 5; the second section of the arc-striking rod 18 is connected to the fixing seat 19 and arranged vertically with the contact 5. The clamp 20 is located at the connection of the two sections of the arc-striking rod 18, and plays the role of fixing and connecting the two sections of the arc-striking rod 18, ensuring a stable connection between the two sections of the arc-striking rod 18. In other optional embodiments, an adjustable clamp can be used, and the adjustable clamp can adjust the tightening force and the connection angle according to actual needs, thereby improving the flexibility and adaptability of the connection of the arc-striking rod 18, but the structure of the adjustable clamp is relatively complex, the manufacturing cost may be high, and it needs to be regularly inspected and adjusted during use, which increases the maintenance workload.
[0029] As a preferred embodiment, a torsion spring is provided in the fixing seat 19 of the arc striking device 11 to provide contact pressure for the arc striking contact 17. The torsion spring is installed in the fixing seat 19, and provides the necessary contact pressure for the arc striking contact 17 through its elastic force, thereby ensuring close contact between the arc striking contact 17 and the contact 5 and the contact finger 6. This close contact helps to reduce the resistance during the generation and extinguishing of the arc, thereby improving the electrical performance and reliability of the disconnector. In other optional embodiments, a spring sheet can also be used to provide the necessary contact pressure for the arc striking contact 17. The spring sheet not only provides stable contact pressure, but also has relatively low cost. Compared with the torsion spring, the elasticity and durability of the spring sheet may be poor. During long-term use, the spring sheet may lose its elasticity due to fatigue, resulting in unstable contact pressure.
[0030] The specific implementation process of this embodiment is as follows: the four-break disconnector of the present invention includes a base 2, a contact 5, a contact finger 6, a support insulator 7, a connection device, and an arc-starting device 11. During the opening and closing movement of the disconnector, the driving rod 8 is driven to move by the operating mechanism of the disconnector. In the base 2, the driving rod 8 drives the two rotating seats 3 connected thereto to rotate, the rotating seat 3 drives the connecting rod 4, and the connecting rod 4 drives the other rotating seats 3 to rotate to realize the movement of the contact 5 and the contact finger 6 in opposite directions, forming four breaks in opposite directions. In the closed state, the two-phase switch device is connected through the connecting device 1 to ensure the normal flow of current in the conductive part. The disconnector connecting device 1 is mainly assembled by a conductive plate 14 and a conductive clamp 16.
[0031] In order to ensure that the arc generated during the opening and closing process of the switching device does not burn the contact 5, an arc striking device 11 is provided on the contact 5 and the contact finger 6. The arc striking device 11 contacts the contact 5 before and separates after the contact 5 during the opening and closing process of the switching device. The arc striking device 11 provides contact pressure through a torsion spring. When the switching device is in the open state, it is parallel to the conductive arm on the side of the contact 5 or the contact finger 6. In order to ensure that the ablation-resistant contacts can make reliable contact during the opening and closing process, it can be adjusted through a clamp.
[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.
Claims
1. A four-break disconnector, characterized in that: It comprises a double-break horizontal opening isolating switch, which comprises a connecting rod transmission mechanism arranged below it, which is arranged on a base, and which comprises a rotating seat and a connecting rod, which drives the rotating seat to rotate to realize the opening and closing operations of contacts and contact fingers arranged on the top of the support insulator on the rotating seat, and two groups of double-break horizontal opening isolating switches are arranged, and the two double-break horizontal opening isolating switches are connected in series through a connecting device, and the connecting rod transmission mechanisms of the two double-break horizontal opening isolating switches are connected through a transmission rod, and one end of the transmission rod is connected to a rotating shaft, which is installed on an axle seat arranged on the side of any one of the bases and makes a circular motion with the axle seat as the center to drive the two connecting rod transmission mechanisms to move simultaneously through the transmission rod.
2. The four-break disconnector according to claim 1, characterized in that: A connecting rod is provided on the transmission rod, and two ends of the connecting rod are respectively connected to a rotating seat under any contact finger of the two double-break horizontal opening isolating switches.
3. The four-break disconnector according to claim 2, characterized in that: The rotating seat connected to the connecting rod is provided with a protruding arm so that the connecting rod can be connected to the rotating seat.
4. The four-break disconnector according to any one of claims 1 to 3, characterized in that: The connecting device comprises a conductive plate, at least two of which are arranged opposite to each other on both sides of the poles provided on the contact fingers at both ends of the two double-break horizontal opening isolating switches and fixed by fasteners.
5. The four-break disconnector according to claim 4, characterized in that: Two conductive clamps are respectively arranged on the inner side of the two conductive plates for respectively clamping the poles arranged on the contact fingers at both ends of the two double-break horizontal opening isolating switches.
6. The four-break disconnector according to claim 5, characterized in that: An arc striking device is provided between the corresponding contacts and contact fingers.
7. The four-break disconnector according to claim 6, characterized in that: The arc striking device comprises an arc striking contact, an arc striking rod and a fixing seat, and the arc striking contact is connected to the fixing seat through the arc striking rod.
8. The four-break disconnector according to claim 7, characterized in that: The arc-striking rod is arranged in two sections, the two sections of the arc-striking rod are vertically connected and a clamp is provided at the connection to keep the two arc-striking rods in a vertical relationship.
9. The four-break disconnector according to claim 8, characterized in that: One section of the arc-starting rod is arranged parallel to the contact, and the other section is arranged perpendicular to the contact.
10. The four-break disconnector according to claim 9, characterized in that: A torsion spring is arranged in the fixing seat of the arc striking device to provide contact pressure of the arc striking contact.