Overhead bus contact protection switch device and use method thereof

Abstract

The invention discloses an overhead bus contact protection switch device and a using method thereof, and belongs to the field of transformer substations, the overhead bus contact protection switch device comprises I bus protection equipment, II bus protection equipment, an HGIS contact switch body, a three-way assembly, a sleeve assembly and a connecting wire, and the I bus protection equipment and the II bus protection equipment share the HGIS contact switch body, the sleeve assembly and the connecting wire; compared with a conventional independent type two-bus protection device, the novel bus contact protection switch is designed in an integrated mode, a large amount of device cost and space resources are saved, the operation and maintenance cost is remarkably reduced, and the reliability of the device is improved.

Description

Technical Field

[0001] The invention belongs to the field of transformer substations, in particular to an overhead busbar connection protection switch device and a use method thereof. Background Art

[0002] Conventional HGIS substations mostly use overhead busbars as the main line for power transmission. For these overhead busbars, they are usually equipped with a variety of protection devices, such as PT voltage transformers, LA lightning arresters and disconnectors. In order to ensure the safety and stability of the power system, users usually use independent protection devices and provide maintenance breaks through independent disconnectors. The hand-powered grounding switches on the same frame are used to provide maintenance grounding protection. In this arrangement, the disconnector is connected to the overhead busbar through an overhead conductor with connecting fittings at both ends. The entire system provides protection for the overhead busbar and substation equipment.

[0003] For substations with dual overhead buses, each bus needs to be equipped with an independent set of protection equipment. These devices include but are not limited to circuit breakers, isolating earthing switches, current transformers and other components, and additional HGIS bus tie switches are also required. Since each protection device is configured independently, there are some disadvantages in actual operation and maintenance.

[0004] First, since the protection equipment is arranged independently and all equipment is exposed to the air, the daily maintenance workload is large and the probability of equipment failure is high. Secondly, the open equipment layout takes up a lot of space, resulting in a large equipment footprint and increasing the overall construction and maintenance costs. In addition, since each busbar needs to be equipped with independent protection equipment, the economy and space utilization of the entire system are poor. Summary of the invention

[0005] In order to solve the problems that the existing overhead busbar protection equipment adopts an independent layout, resulting in large footprint, heavy maintenance workload, high probability of operating failures and poor economy, the present invention provides an overhead busbar connection protection switch device and a use method thereof.

[0006] On the one hand, the present invention is achieved through the following technical solutions: An overhead busbar contact protection switch device comprises a busbar protection device I, a busbar protection device II, an HGIS contact switch body, a three-way assembly, a bushing assembly and a connecting wire. The busbar protection device I and the busbar protection device II share the HGIS contact switch body, the bushing assembly and the connecting wire. The three-way assembly is a cylindrical shell, an upper draw-out opening is drawn from the top of the cylindrical shell, and a support tube is welded to the upper draw-out opening of the middle phase to form a three-way shell, and after the contact seat contacts are installed in the three-way shell, a three-way assembly with three-phase upper support tubes at different angles is formed; The center line of the upper support tube of the two side phase tee assembly is rotated 45 degrees to both sides relative to the center line of the upper support tube of the middle phase; Conductors are arranged inside the bushing assembly, and the HGIS contact switch body is tilted forward and backward and arranged separately, with the middle phase vertically upward and the two side phases rotated 45 degrees to both sides; A set of closed linear DS-ES linear isolating grounding switches are arranged horizontally on the outer sides of the three-way assembly; The length of the side where the three-way assembly is connected to the HGIS tie switch body remains unchanged, and the side where the three-way assembly is connected to the DS-ES linear isolating earthing switch is lengthened; The Ⅰ mother bushing and the Ⅱ mother bushing are connected to the three-phase overhead busbar through connecting wires respectively.

[0007] A further improvement of the present invention is that a group of four-way assemblies are respectively arranged on both sides of the DS-ES linear isolating and grounding switch, and after the four-way assembly and the DS-ES linear isolating and grounding switch are closed, they form a main circuit path with the three-way assembly, and the horizontal center lines of the components of the main circuit are on the same horizontal axis.

[0008] A further improvement of the present invention is that a pull-out opening is stretched out at the upper and lower parts of the cylindrical shell of the three-way assembly, and a support cylinder is welded to each of the upper and lower pull-out openings to form a four-way shell; a contact seat and corresponding contacts are installed on the through-hole insulator connected to the four-way shell and the DS-ES linear isolating grounding switch to form a four-way assembly for connecting various components.

[0009] A further improvement of the present invention is that an inverted enclosed PT voltage transformer is vertically installed on the upper support tube flange of the four-way assembly, and an upright enclosed LA lightning arrester is vertically suspended and installed on the lower support tube flange of the four-way assembly. The enclosed PT voltage transformer and the enclosed LA lightning arrester are respectively connected to the contacts of the four-way assembly through conductors to form a parallel connection with the main circuit.

[0010] A further improvement of the present invention is that the moving contact of the DS-ES linear isolating grounding switch moves horizontally, the DS-ES linear isolating grounding switch is opened, a break is formed in the main circuit, and isolation is provided for the maintenance of the enclosed PT voltage transformer and the enclosed LA lightning arrester; the grounding switch is opened, the isolating switch is closed, and the enclosed PT voltage transformer and the enclosed LA lightning arrester are put into operation; the isolating switch is opened, the grounding switch is closed, and the enclosed PT voltage transformer and the enclosed LA lightning arrester are out of operation.

[0011] A further improvement of the present invention is that the enclosed LA lightning arrester is supported by an adjustable height adjustment bracket, each enclosed LA lightning arrester is equipped with an independent adjustment bracket, the upper plate of the adjustment bracket is a square flange, and four double-headed adjustment screws are installed on the flange to adjust the height of the enclosed LA lightning arrester in all directions around it.

[0012] Another aspect of the present invention is achieved through the following technical solutions: A method for using an overhead busbar contact protection switch arrangement, the steps comprising: The HGIS contact switch body is separated from the bushing air chamber by the insulator inside the tee assembly; A set of DS-ES linear isolating and grounding switches are arranged horizontally on the outside of the three-way assembly; A set of four-way assemblies are respectively arranged on both sides of the DS-ES linear isolating and earthing switch. After the four-way assembly and the DS-ES linear isolating and earthing switch are closed, the three-way assembly forms a main circuit path, and the horizontal center lines of the components of the main circuit are on the same horizontal axis; The moving contact of the DS-ES linear isolating earthing switch moves horizontally, and the DS-ES linear isolating earthing switch opens, forming a break in the main circuit to provide isolation for the maintenance of the enclosed PT voltage transformer and the enclosed LA arrester; The grounding switch is opened, the isolating switch is closed, and the enclosed PT voltage transformer and enclosed LA lightning arrester are put into operation; The isolating switch is opened, the earthing switch is closed, the enclosed PT voltage transformer and the enclosed LA lightning arrester are taken out of operation and enter the maintenance state.

[0013] A further improvement of the present invention is that a drawing opening is stretched out at the upper and lower parts of the cylindrical shell, and a support tube is welded to each of the upper and lower drawing openings to form a four-way shell; a contact seat and corresponding contacts are installed on the through-hole insulator connected to the DS-ES linear isolating grounding switch in the four-way shell, forming a four-way assembly for connecting various components.

[0014] From the above technical scheme, it can be seen that the beneficial effects of the present invention are: compared with conventional independent two-busbar protection equipment, the present invention not only saves a lot of equipment costs and space resources by integrating the design into a new type of busbar connection protection switch, but also significantly reduces the operation and maintenance costs and improves the reliability of the equipment. The invention has important social significance and significant economic effects in saving resources, reducing costs and improving economic benefits. Specifically: 1. Reduce maintenance workload and failure probability The original busbar protection equipment includes isolating and grounding switches, voltage transformers and lightning arresters. Since the equipment is exposed to the air, the daily maintenance workload is large and the probability of operating failure is high. By integrating these devices into the new busbar protection contact switch, using enclosed DS-ES isolating and grounding switches, enclosed PT voltage transformers and enclosed LA lightning arresters, the production and procurement costs can be greatly reduced, while the daily maintenance workload is reduced, the probability of failure is greatly reduced, and the reliability is significantly improved.

[0015] 2. Reduce floor space and construction costs Independent protection devices with open layout occupy a large area, and each set of equipment needs to occupy an independent compartment, resulting in a large amount of civil engineering work and not conducive to saving land resources. By integrating these independent devices into a new busbar connection protection switch, the land area of ​​two compartments can be saved, and the civil engineering cost and workload can be greatly reduced.

[0016] 3. Save the cost of connecting wires and control cabinets Two sets of busbar protection equipment and busbar tie switches share two sets of bushings and connecting wires. This design greatly saves a large number of connecting wires with hardware. At the same time, the three sets of LCP secondary control cabinets are integrated into one vertical control cabinet, which is more compact, reduces the number of two sets of control cabinets and the amount of control cables, and further reduces the procurement cost of equipment and cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of a specific implementation method of the present invention.

[0019] In the attached figure: 1. HGIS interconnecting switch body; 2. Three-way assembly; 3. Bushing assembly; 4. DS-ES linear isolating earthing switch; 5. Four-way assembly; 6. Enclosed PT voltage transformer; 7. Enclosed LA lightning arrester; 8. LCP vertical control cabinet; 9. Adjustment bracket; 10. Connecting wire; 11. Three-phase overhead busbar. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0021] refer to Figure 1As shown, the present invention provides an overhead busbar contact protection switch device and a method for using the same, which adopts a method for connecting the common bushings and wires to the overhead busbars symmetrically arranged on both sides. The I busbar protection device shares the I busbar of the HGIS contact switch and the corresponding wires, and the II busbar protection device shares the II busbar of the HGIS contact switch and the corresponding wires. The main design implementation method is: The lower bend neck assembly of the conventional HGIS contact switch I and II female bushings is removed and designed as an extended three-way assembly 2; the three-way assembly 2 is a cylindrical shell, and an upper pull-out is stretched out on the top of the cylindrical shell. The middle phase upper pull-out is welded to form a three-way shell. After the contact seat contact is installed, a three-way assembly 2 with different angles of the three-phase upper support tube is formed. The center line of the upper support tube of the two-phase three-way assembly 2 is rotated 45 degrees to both sides relative to the center line of the upper support tube of the middle phase. After the installation of the bushing and the internal conductor, the original contact switch is tilted forward and backward and arranged separately, and the middle phase is designed to be vertically upward, and the two side phases are rotated 45 degrees to both sides. The length of the side of the tee connected to the original contact switch body remains unchanged, and the side of the tee connected to the DS-ES isolating grounding switch is lengthened. The I female bushing and the II female bushing are connected to the I female three-phase overhead busbar and the II female three-phase overhead busbar 11 through connecting wires 10 respectively; The contact switch body is separated from the bushing gas chamber by a dead insulator inside the three-way assembly 2. A set of closed linear DS-ES isolation and grounding combination switches 4 are arranged horizontally outside the three-way assembly 2; A set of four-way assemblies 5 is respectively arranged on both sides of the DS-ES isolating and grounding switch 4. After the four-way assembly 5, the DS-ES isolating and grounding switch 4 are closed, and the extended three-way assembly 2 forms a main circuit path, and the horizontal center lines of the components of the main circuit are on the same horizontal axis; The moving contact of the DS-ES isolating grounding switch 4 moves horizontally, and the DS-ES isolating grounding switch 4 is opened, forming a break in the main circuit, providing isolation for the maintenance of the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7; the grounding switch ES is opened, the isolating switch DS is closed, and the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are put into operation; the isolating switch DS is opened, the grounding switch ES is closed, the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are out of operation and enter the maintenance state, thereby providing safe grounding protection for the maintenance of the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7.

[0022] A drawing opening is stretched out at the upper and lower ends of the cylindrical shell, and a support tube is welded to each of the upper and lower drawing openings to form a four-way shell. A contact seat and corresponding contacts are installed on the through-hole insulator connected to the DS-ES isolating grounding switch 4 inside the shell to form a four-way assembly 5 for connecting various components. An inverted enclosed PT voltage transformer 6 is vertically installed on the upper support tube flange of the four-way assembly 5, and an upright enclosed LA lightning arrester 7 is vertically suspended on the lower support tube flange of the four-way assembly 5. The enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are respectively connected to the contacts of the four-way assembly 5 through conductors, forming a parallel connection with the main circuit. The vertical center line of the upper and lower support tubes of the four-way assembly 5 and the center line of the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are on the same vertical axis; The conductive component supporting insulators used in the bushing assembly 3, the three-way assembly 2, the DS-ES isolating earthing switch 4, and the four-way assembly 5 are all through-hole insulators, so that they form a conductive SF6 gas chamber. The end cover of the four-way assembly 5 is installed with a stainless steel adsorbent cover with air holes by 4 M8 stainless steel screws, and a molecular sieve is loaded to adsorb moisture and impurities in the gas chamber; the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are both independent SF6 gas chambers, which are filled with SF6 gas at rated pressure to provide insulation. Due to different inflation pressures, the gas chambers of the enclosed PT voltage transformer 6 and the enclosed LA lightning arrester 7 are separated from the bushing-isolating earthing switch gas chamber by non-through insulators; The closed LA arrester 7 is supported by an adjustable height bracket 9. Each closed LA arrester 7 is equipped with an independent adjustment bracket 9. The upper plate of the adjustment bracket 9 is a square flange, and 4 double-headed adjustment screws are installed on the flange, so that there is no dead angle for height adjustment in all directions around the closed LA arrester 7. The lower plate of the adjustment bracket 9 is a square plate without holes. After the installation and adjustment are completed, the lower plate of the adjustment bracket 9 is welded to the embedded H-steel foundation embedded parts, so that the components of the entire expanded protection contact switch can be firmly connected and the overall stability and reliability.

[0023] The LCP control cabinets of the original two sets of open busbar protection equipment are integrated with the suspended LCP control cabinet of the original conventional HGIS busbar interconnection switch. An LCP vertical control cabinet 8 is designed on the side of the new interconnection protection switch, and the protection and control components of the three sets of equipment are integrated into one LCP vertical control cabinet 8, reducing two sets of control cabinets and corresponding civil foundation construction work.

[0024] Through this design method of symmetrically arranging common bushings and connecting wires, the original conventional busbar contact switch has the function of protecting two overhead busbars at the same time, and is designed into a new busbar contact protection switch. The busbar contact function is realized by the circuit breaker, current transformer and DS-ES angle disconnector of the inner original contact switch connected to the I and II mother bushings; the newly added busbar protection function is realized by the outer DS-ES linear disconnecting grounding switch 4, enclosed PT voltage transformer 6, and enclosed LA lightning arrester 7 connected to the I and II mother bushings. The grounding switch ES is opened, the disconnector DS is closed, and the enclosed PT voltage transformer 6 and enclosed LA lightning arrester 7 are put into operation; the disconnector DS is opened, the grounding switch ES is closed, and the enclosed PT voltage transformer 6 and enclosed LA lightning arrester 7 are out of operation and enter the maintenance state.

[0025] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An overhead busbar contact protection switch device, characterized in that: It comprises a I mother protection device, a II mother protection device, an HGIS contact switch body (1), a three-way assembly (2), a bushing assembly (3) and a connecting wire (10), wherein the I mother protection device and the II mother protection device share the HGIS contact switch body (1), the bushing assembly (3) and the connecting wire (10); The three-way assembly (2) is a cylindrical shell, an upper draw-off opening is drawn from the top of the cylindrical shell, and a support tube is welded to the upper draw-off opening of the middle phase to form a three-way shell. After the contact seat contacts are installed in the three-way shell, a three-way assembly (2) with three-phase upper support tubes at different angles is formed; The center lines of the upper support tubes of the two side phase tee assemblies (2) are rotated 45 degrees to both sides relative to the center line of the upper support tube of the middle phase; The bushing assembly (3) is provided with a conductor inside, and the HGIS contact switch body (1) is arranged to be tilted forward and backward and separated, with the middle phase vertically upward and the two side phases rotated 45 degrees to the sides respectively; A set of closed linear DS-ES linear isolating earthing switches (4) are respectively arranged horizontally on the outer sides of the three-way assembly (2); The length of the side of the three-way assembly (2) connected to the HGIS contact switch body (1) remains unchanged, and the side of the three-way assembly (2) connected to the DS-ES linear isolating earthing switch (4) is lengthened; The I mother bushing and the II mother bushing are respectively connected to the three-phase overhead busbar (11) via connecting conductors (10).

2. The overhead busbar connection protection switch device according to claim 1 is characterized in that: A set of four-way assemblies (5) are respectively arranged on both sides of the DS-ES linear isolating earthing switch (4); after the four-way assemblies (5) and the DS-ES linear isolating earthing switch (4) are switched on, they form a main circuit path with the three-way assembly (2); and the horizontal center lines of the components of the main circuit are on the same horizontal axis.

3. The overhead busbar connection protection switch device according to claim 2 is characterized in that: A pull-out opening is drawn out from the top and bottom of the cylindrical shell of the three-way assembly (2), and a support cylinder is welded to each of the upper and lower pull-out openings to form a four-way shell (5); a contact seat and corresponding contacts are installed on the through-hole insulator connected to the four-way shell (5) and the DS-ES linear isolating earthing switch (4) to form a four-way assembly (5) for connecting various components.

4. The overhead busbar connection protection switch device according to claim 3 is characterized in that: An inverted enclosed PT voltage transformer (6) is vertically mounted on the upper support tube flange of the four-way assembly (5), and an upright enclosed LA lightning arrester (7) is vertically suspended and mounted on the lower support tube flange of the four-way assembly (5). The enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7) are respectively connected to the contacts of the four-way assembly (5) through conductors, and are connected in parallel with the main circuit.

5. The overhead busbar connection protection switch device according to claim 4 is characterized in that: The moving contact of the DS-ES linear isolating grounding switch (4) moves horizontally, the DS-ES linear isolating grounding switch (4) is opened, a break is formed in the main circuit, and isolation is provided for the maintenance of the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7); the grounding switch is opened, the isolating switch is closed, and the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7) are put into operation; the isolating switch is opened, the grounding switch is closed, and the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7) are out of operation.

6. The overhead busbar connection protection switch device according to claim 1 is characterized in that: The enclosed LA arrester (7) is supported by an adjustable height bracket (9), each enclosed LA arrester (7) is equipped with an independent adjustable bracket (9), the upper plate of the adjustable bracket (9) is a square flange, and four double-headed adjusting screws are installed on the flange to adjust the height of the enclosed LA arrester (7) in all directions around it.

7. A method for using an overhead busbar contact protection switch arrangement, characterized in that: The steps include, The HGIS contact switch body (1) is separated from the bushing air chamber by an insulator inside the tee assembly (2); A set of DS-ES linear isolating and grounding switches (4) are respectively arranged horizontally outside the three-way assembly (2); A set of four-way assemblies (5) are respectively arranged on both sides of the DS-ES linear isolating earthing switch (4); after the four-way assemblies (5) and the DS-ES linear isolating earthing switch (4) are closed, they form a main circuit path with the three-way assembly (2); and the horizontal center lines of the components of the main circuit are on the same horizontal axis; The moving contact of the DS-ES linear isolating earthing switch (4) moves horizontally, and the DS-ES linear isolating earthing switch (4) is opened, thereby forming a break in the main circuit, thereby providing isolation for the maintenance of the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7); The grounding switch is opened, the isolating switch is closed, and the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7) are put into operation; The isolating switch is opened, the earthing switch is closed, and the enclosed PT voltage transformer (6) and the enclosed LA lightning arrester (7) are taken out of operation and enter the maintenance state.

8. The method for using the overhead busbar connection protection switch arrangement according to claim 7 is characterized in that: A drawing opening is drawn out from the upper and lower parts of the cylindrical shell (8), and a support tube is welded to each of the upper and lower drawing openings to form a four-way shell (5); a contact seat and corresponding contacts are installed on a through-hole insulator connected to the DS-ES linear isolating grounding switch (4) inside the four-way shell (5), forming a four-way assembly (5) for connecting various components.

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