Compact three-position switchgear

Abstract

The invention discloses a compact three-position switch device. The compact three-position switch device comprises a mounting box; the top of the inner cavity of the installation box is provided with a switching-on and switching-off mechanism. According to the invention, through cooperative arrangement of the switching-on and switching-off mechanism, the shielding mechanism, the conductive mechanism and the grounding switching-on and switching-off mechanism, the compact circuit breaker cabinet is vacuum arc-extinguishing and is integrally poured in epoxy resin, so that more sufficient protection can be provided for the vacuum arc-extinguishing chamber, and the influence of dust and moisture on the external insulation capability of the arc-extinguishing chamber can be eliminated; on the basis of an original 10kV arc extinguish chamber pole, by optimizing an arc extinguish chamber on-off technology, low separation speed, small stroke and light weight of a contact are realized, less mechanism operation work is needed, personnel debugging is facilitated, small size of a whole circuit breaker switch is realized, 24kV withstand voltage and on-off functions are also realized, and low abrasion loss of a whole operating system is realized. The action of a 24kV pole can be replaced by a 10kV circuit breaker operating mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage circuit breakers, and in particular to a compact three-position switchgear. Background Art

[0002] High-voltage circuit breaker switchgear is mainly used in 24kV voltage level, which can safely and effectively isolate and disconnect the circuit breaker switch of the power grid current, avoid further expansion of faults, and ensure the safe operation of power supply lines. It is widely used in power distribution in urban residential areas, small distribution stations, small switchgears, shopping malls, airports, railways, etc.

[0003] The existing medium-voltage power grid has generally adopted a 20kV voltage level. Dozens of countries and regions have adopted the 20kV voltage level as the standard voltage for medium-voltage distribution networks, and it has been included in the IEC standard.

[0004] XGN15-24 is a unitized, modular, expandable metal-enclosed switchgear with the characteristics of small size, light weight, simple structure, flexible operation and easy installation.

[0005] However, the circuit breaker cabinet in the prior art has low protection for the vacuum arc extinguishing space and cannot eliminate the influence of dust and moisture on the external insulation capacity of the arc extinguishing chamber, which leads to the defects of many required operating mechanisms and high wear of the operating system. Summary of the invention

[0006] The object of the present invention is to provide a compact three-position switchgear, in which the compact circuit breaker cabinet is vacuum arc extinguishing and is integrally cast in epoxy resin, which can provide more adequate protection for the vacuum arc extinguishing chamber and eliminate the influence of dust and moisture on the external insulation capacity of the arc extinguishing chamber, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: A compact three-position switchgear comprises a mounting box;

[0008] A closing and opening mechanism is arranged at the top of the inner cavity of the installation box, a shielding mechanism is arranged at the bottom of the closing and opening mechanism, a conducting mechanism is arranged at the bottom of the shielding mechanism, and a grounding closing and opening mechanism is arranged at the bottom of the conducting mechanism;

[0009] The closing and opening mechanism comprises a closing assembly and an opening assembly, wherein the closing assembly is arranged at the top of the inner cavity of the installation box, and the opening assembly is arranged on the closing assembly;

[0010] The shielding mechanism comprises a first shielding connector and a second shielding connector, wherein the first shielding connector is arranged at the bottom of the closing and opening mechanism, and the second shielding connector is arranged at the bottom of the first shielding connector;

[0011] The grounding separation and combination mechanism comprises a clamping claw assembly and a transmission assembly. The clamping claw assembly is arranged at the bottom of the installation box, and the transmission assembly is arranged inside the installation box.

[0012] Exemplarily, the closing assembly includes a first connecting member and an air bag box, the first connecting member is fixedly installed inside the air bag box, the air bag box is fixedly installed inside the installation box, a second connecting member is installed below the first connecting member, and an insulating shaft is fixedly installed at the bottom of the first connecting member.

[0013] Exemplarily, the disconnecting assembly includes a three-phase isolating switch and a grounding static switch. The three-phase isolating switch is arranged at the bottom of the insulating shaft, and the grounding static switch is arranged on one side of the three-phase isolating switch.

[0014] Exemplarily, the first shielding connector includes a first shielding ball, which is disposed at the bottom of the air bag box. A first conductive bar is disposed at the bottom of the first shielding ball, and a grounding switch is connected to the first conductive bar.

[0015] Exemplarily, a pole is provided at the bottom of the first conductive bar, an arc extinguishing chamber is provided at the bottom of the pole, a flexible connector is provided at the bottom of the arc extinguishing chamber, and a pole outlet insert is provided at one end of the flexible connector.

[0016] Exemplarily, an insulating pull rod is provided at the bottom of the flexible connector, and an operating mechanism is provided at the bottom end of the insulating pull rod.

[0017] Exemplarily, a current transformer is provided at one end of the pole outlet insert, a second conductive bar is bolted to one side of the current transformer, and an outlet bar is also bolted to one side of the current transformer.

[0018] Exemplarily, the second shielding connector includes an outgoing cable connection row, which is arranged below the outgoing line row, and a second shielding ball is installed at the bolt connection between the outgoing cable connection row and the outgoing line row, a connection cover is arranged on one side of the second shielding ball, and a supporting insulator is arranged on the other side of the second shielding ball.

[0019] Exemplarily, the clamp assembly includes a grounding blade, which is connected to the bottom of the outlet line row, a stainless steel spring limit plate is provided on the outer side of the grounding blade, a copper claw is provided inside the stainless steel spring limit plate, an inner claw clamp is provided on the inner side of the copper claw, and a limiting rubber pad is provided on the outer side of the grounding blade.

[0020] Exemplarily, the transmission assembly includes a first spur gear, which is arranged inside a first connecting member, a second spur gear is meshed with one side of the first spur gear, the second spur gear is connected to a linkage long rod, one end of the linkage long rod is provided with an over-centering spring, one end of the over-centering spring is provided with a grounding rotating shaft, a grounding movable knife bracket is provided on the outer side of the grounding rotating shaft, and a grounding movable knife is installed on the grounding movable knife bracket.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention coordinates the closing and opening mechanisms, the shielding mechanisms, the conducting mechanisms and the grounding and opening and closing mechanisms. The compact circuit breaker cabinet is vacuum arc extinguishing and is integrally cast in epoxy resin, which can provide more adequate protection for the vacuum arc chamber and eliminate the influence of dust and moisture on the external insulation capacity of the arc chamber. A column-type solid-sealed pole is adopted, which is 210mm apart. On the original 10kV arc chamber pole, by optimizing the arc chamber breaking technology, a low contact separation speed, a small stroke, a light weight, and less mechanism operating power are achieved, which is convenient for personnel to debug, and the overall circuit breaker switch is small in size. The 24kV withstand voltage and breaking functions are also achieved, thereby achieving low wear of the entire operating system, and the 10kV circuit breaker operating mechanism can replace the action of the 24kV pole.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the second spur gear of the present invention;

[0026] Figure 3 It is a schematic diagram of the pole structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the first shielding ball structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the connecting cover of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the stainless steel spring limiter of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the over-center spring of the present invention;

[0031] Figure 8It is a schematic diagram of the structure of the grounding shaft of the present invention.

[0032] In the figure: 1 first connector; 2 insulating shaft; 3 three-phase isolating knife; 4 grounding static knife; 5 second connector; 6 first shielding ball; 7 first conductive bar; 8 arc extinguishing chamber; 9 soft connector; 10 pole outlet insert; 11 insulating pull rod; 12 operating mechanism; 13 current transformer; 14 second conductive bar; 15 outlet bar; 16 outlet cable connection bar; 17 second shielding ball; 18 connecting cover; 19 supporting insulator; 20 grounding blade; 21 stainless steel spring limiter; 22 copper knife claw; 23 inner claw clamp; 24 limit rubber pad; 25 first spur gear; 26 second spur gear; 27 linkage long rod; 28 over-center spring; 29 grounding shaft; 30 grounding movable knife bracket; 31 grounding movable knife; 32 air bag box; 33 pole; 34 grounding switch;

[0033] 35 installation box. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0035] like Figure 1-Figure 8 As shown, the present invention provides a compact three-position switch device, including an installation box 35, a closing and opening mechanism is arranged on the top of the inner cavity of the installation box 35, a shielding mechanism is arranged on the bottom of the closing and opening mechanism, a conductive mechanism is arranged on the bottom of the shielding mechanism, and a grounding closing and opening mechanism is arranged on the bottom of the conductive mechanism.

[0036] The closing and opening mechanism includes a closing assembly and an opening assembly, wherein the closing assembly is arranged at the top of the inner cavity of the installation box 35, and the opening assembly is arranged at the closing assembly. The closing and opening effects are conveniently achieved through the cooperation of the closing assembly and the opening assembly.

[0037] The shielding mechanism comprises a first shielding connector and a second shielding connector. The first shielding connector is arranged at the bottom of the closing and opening mechanism, and the second shielding connector is arranged at the bottom of the first shielding connector.

[0038] The uniform electric field shielding technology is realized by the cooperation of the first shielding connector and the second shielding connector. According to the needs of the shielding component, an internal cast metal shielding component or an internal full silicone insulation structure can be selected.

[0039] The grounding separation and combination mechanism includes a clamping jaw assembly and a transmission assembly. The clamping jaw assembly is arranged at the bottom of the installation box 35, and the transmission assembly is arranged inside the installation box 35.

[0040] The grounding, closing and opening of the circuit breaker switch are realized through the cooperation of the clamping assembly and the transmission assembly

[0041] like Figure 1 As shown, the closing assembly includes a first connecting member 1 and an air bag box 32, the first connecting member 1 is fixedly installed inside the air bag box 32, the air bag box 32 is fixedly installed inside the installation box 35, the second connecting member 5 is installed below the first connecting member 1, and the bottom of the first connecting member 1 is fixedly installed with an insulating shaft 2 to facilitate the closing operation.

[0042] like Figure 1 As shown, the opening switch assembly includes a three-phase isolating knife 3 and a grounding static knife 4. The three-phase isolating knife 3 is arranged at the bottom of the insulating shaft 2, and the grounding static knife 4 is arranged on one side of the three-phase isolating knife 3, so as to realize the opening operation.

[0043] The air bag box body 32 is a three-position isolating switch, and is composed of cylindrical upper and lower boxes connected. The primary current enters the switch through the first connecting piece 1. The insulating shaft body 2 is the rotating insulating shaft of the isolating switch. The insulating shaft body 2 is connected to the three-phase isolating knife 3. The three-phase isolating knife 3 is a double-blade knife. When the three-phase isolating knife 3 is placed vertically, the first connecting piece 1 and the second connecting piece 5 are connected to close the main circuit.

[0044] When the operating mechanism drives the insulating shaft 2 counterclockwise to the empty position on the left, and at the same time the lower part of the three-phase isolating knife 3 rotates to the empty position to isolate and open the switch, the three-phase isolating knife 3 rotates to connect with the grounding static knife 4 to ground the isolating switch. When the three-phase isolating knife 3 is placed vertically, the primary current flows through the isolating switch to the first conductive bar 7.

[0045] like Figure 1 As shown, the first shielding connector includes a first shielding ball 6, which is arranged at the bottom of the air bag box 32. A first conductive row 7 is arranged at the bottom of the first shielding ball 6, and a grounding switch 34 is connected to the first conductive row 7 to realize auxiliary shielding operation.

[0046] like Figure 1 As shown, a pole 33 is provided at the bottom of the first conductive bar 7, an arc extinguishing chamber 8 is provided at the bottom of the pole 33, a soft connector 9 is provided at the bottom of the arc extinguishing chamber 8, and a pole outlet insert 10 is provided at one end of the soft connector 9, which plays a role of soft connection.

[0047] like Figure 1 As shown, an insulating pull rod 11 is provided at the bottom of the flexible connector 9, and an operating mechanism 12 is provided at the bottom end of the insulating pull rod 11 to perform transmission operation.

[0048] like Figure 1As shown, a current transformer 13 is provided at one end of the pole outlet insert 10, a second conductive bar 14 is bolted to one side of the current transformer 13, and an outlet bar 15 is also bolted to one side of the current transformer 13, which is conducive to realizing the conductive outlet operation.

[0049] like Figure 1 As shown, the second shielding connector includes an outgoing cable connection row 16, which is arranged below the outgoing cable row 15. A second shielding ball 17 is installed at the bolt connection between the outgoing cable connection row 16 and the outgoing cable row 15. A connection cover 18 is arranged on one side of the second shielding ball 17, and a supporting insulator 19 is arranged on the other side of the second shielding ball 17 to increase its shielding effect.

[0050] Due to the compact phase-to-phase distance, a first shielding ball 6 is designed by using uniform electric field shielding technology. The first shielding ball 6 has an internal metal aluminum structure with a groove designed inside for mounting bolts and is poured with silicone on the outside.

[0051] According to the needs of the shielding parts, an internal cast metal shielding part or a full silicone insulation structure can be selected to shield the first conductive bar 7 and the fixing bolts, which greatly reduces the phase-to-phase distance. The first conductive bar 7 is connected to the pole 33 of the circuit breaker. The pole 33 is cylindrical, with three sheds designed on the upper part, a cylindrical concave body inside, one side connected to another cylinder, and an shed designed in the lower cavity to increase the creepage distance. It is fixed to the static end of the arc extinguishing chamber 8, and the moving end of the arc extinguishing chamber 8 is connected to the soft connector 9, which is fixed to the pole outlet insert 10. The moving contact of the arc extinguishing chamber 8 moves, and the action is transmitted by connecting the operating mechanism 12 with the insulating pull rod 11;

[0052] The pole outlet insert 10 is connected to the current transformer 13, the incoming line of the current transformer 13 is connected through the second conductive bar 14, the outlet bar 15 is connected to the outlet cable connection bar 16, and the bolting point of the outlet bar 15 and the outlet cable connection bar 16 is connected with the second shielding ball 17, which uniformly forms the electric field and reduces the phase-to-phase distance. The outlet bar 15 is connected to the supporting insulator 19, and the second shielding ball 17 is used to uniformly form the electric field at the bolting point.

[0053] like Figure 1 As shown, the clamp assembly includes a grounding blade 20, which is connected to the bottom of the outlet row 15. A stainless steel spring limit plate 21 is arranged on the outer side of the grounding blade 20, a copper claw 22 is arranged inside the stainless steel spring limit plate 21, an inner claw clamp 23 is arranged on the inner side of the copper claw 22, and a limiting rubber pad 24 is arranged on the outer side of the grounding blade 20.

[0054] like Figure 1As shown, the transmission assembly includes a first spur gear 25, which is arranged inside the first connecting member 1, and a second spur gear 26 is meshed with one side of the first spur gear 25, and the second spur gear 26 is connected to a linkage long rod 27, one end of the linkage long rod 27 is provided with an over-center spring 28, one end of the over-center spring 28 is provided with a grounding shaft 29, the outer side of the grounding shaft 29 is provided with a grounding movable knife bracket 30, and a grounding movable knife 31 is installed on the grounding movable knife bracket 30.

[0055] The primary conductive component is connected to the grounding switch 34 of the circuit breaker, the outgoing line row 15 and the claw-shaped grounding blade 20, the outer side of which is a stainless steel spring limiter 21, the inner side is a copper claw 22, and the upper part of the claw clamp is a limit rubber pad 24.

[0056] The operation process is as follows: when the isolating operating mechanism drives the isolating switch to ground, it also drives the first spur gear 25 to rotate, and at the same time drives the second spur gear 26 to move. The second spur gear 26 rotates the linkage long rod 27 to rotate clockwise, thereby compressing the over-center spring 28. The over-center spring stores energy and releases energy, driving the grounding shaft 29 to rotate. The shaft 29 is connected to the grounding movable knife bracket 30, and the bracket 30 is connected to the grounding movable knife 31, thereby realizing the grounding closing and opening of the circuit breaker switch.

[0057] In summary, the injection-molded umbrella group on the outer cylindrical surface of the circuit breaker pole increases the electrical distance compared to the flat surface, and the cylindrical body is simpler and easier to injection mold. In addition, the electric field is uniform, and the uniform electric field is more conducive to reducing the electrical distance and realizing a miniaturized design.

[0058] The compact circuit breaker cabinet is vacuum arc extinguishing and is cast in epoxy resin as a whole, which can provide more adequate protection for the vacuum arc extinguishing chamber and eliminate the influence of dust and moisture on the external insulation capacity of the arc extinguishing chamber.

[0059] The shielded voltage-equalizing design can effectively reduce the cabinet size and enhance environmental adaptability.

[0060] The grounding operating mechanism of the isolating switch and the grounding of the circuit breaker switch are linked, which can greatly reduce the safety risk of the equipment and improve maintenance efficiency.

[0061] Unitized, modular, and expandable metal-enclosed switchgear features small size, light weight, simple structure, flexible operation, and easy installation.

[0062] The three-position load switch has a simple structure and is no different from the original XGN15-12. It will not change the user's operating habits.

[0063] It provides a cost-effective solution, which helps the power grid to achieve technological upgrading at a lower cost.

[0064] Adopt column-type solid-sealed poles, which are 210mm apart, on the original 10kV arc extinguishing chamber poles, by optimizing the arc extinguishing chamber breaking technology, a low contact separation speed, a small stroke, a light weight, and less mechanism operation power are achieved, which is convenient for personnel to debug, and the overall circuit breaker switch is small in size. It also realizes 24kV withstand voltage and breaking functions, thereby achieving low wear of the entire operating system. The 10kV circuit breaker operating mechanism can replace the 24kV pole.

[0065] Temperature rise and partial discharge sensors are installed in the poles to monitor the equipment working conditions at all times and transmit the information to the staff remotely, thus improving the predictability of risks.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact three-position switchgear, characterized in that: comprising a mounting box (35); A closing and opening mechanism is arranged at the top of the inner cavity of the installation box (35), a shielding mechanism is arranged at the bottom of the closing and opening mechanism, a conducting mechanism is arranged at the bottom of the shielding mechanism, and a grounding closing and opening mechanism is arranged at the bottom of the conducting mechanism; The closing and opening mechanism comprises a closing component and an opening component, wherein the closing component is arranged at the top of the inner cavity of the installation box (35), and the opening component is arranged on the closing component; The shielding mechanism comprises a first shielding connector and a second shielding connector, wherein the first shielding connector is arranged at the bottom of the closing and opening mechanism, and the second shielding connector is arranged at the bottom of the first shielding connector; The grounding separation and combination mechanism comprises a clamping jaw assembly and a transmission assembly, wherein the clamping jaw assembly is arranged at the bottom of the installation box (35), and the transmission assembly is arranged inside the installation box (35).

2. A compact three-position switchgear according to claim 1, characterized in that: The closing assembly comprises a first connecting member (1) and an air bag box (32), wherein the first connecting member (1) is fixedly mounted inside the air bag box (32), and the air bag box (32) is fixedly mounted inside an installation box (35), a second connecting member (5) is mounted below the first connecting member (1), and an insulating shaft (2) is fixedly mounted at the bottom of the first connecting member (1).

3. A compact three-position switchgear according to claim 2, characterized in that: The switch-off assembly comprises a three-phase isolating knife (3) and a grounding static knife (4); the three-phase isolating knife (3) is arranged at the bottom of the insulating shaft (2); and the grounding static knife (4) is arranged on one side of the three-phase isolating knife (3).

4. A compact three-position switchgear according to claim 1, characterized in that: The first shielding connector comprises a first shielding ball (6), the first shielding ball (6) is arranged at the bottom of the air bag box (32), a first conductive row (7) is arranged at the bottom of the first shielding ball (6), and a grounding switch (34) is connected to the first conductive row (7).

5. A compact three-position switchgear according to claim 4, characterized in that: A pole (33) is arranged at the bottom of the first conductive bar (7), an arc extinguishing chamber (8) is arranged at the bottom of the pole (33), a flexible connector (9) is arranged at the bottom of the arc extinguishing chamber (8), and a pole outlet insert (10) is arranged at one end of the flexible connector (9).

6. A compact three-position switchgear according to claim 5, characterized in that: An insulating pull rod (11) is arranged at the bottom of the flexible connector (9), and an operating mechanism (12) is arranged at the bottom end of the insulating pull rod (11).

7. A compact three-position switchgear according to claim 5, characterized in that: A current transformer (13) is provided at one end of the pole outlet insert (10), a second conductive bar (14) is bolted to one side of the current transformer (13), and an outlet bar (15) is also bolted to one side of the current transformer (13).

8. The compact three-position switchgear according to claim 1, characterized in that: The second shielding connector comprises an outlet cable connection row (16), wherein the outlet cable connection row (16) is arranged below the outlet cable row (15), a second shielding ball (17) is installed at the bolt connection between the outlet cable connection row (16) and the outlet cable row (15), a connection cover (18) is arranged on one side of the second shielding ball (17), and a supporting insulator (19) is arranged on the other side of the second shielding ball (17).

9. A compact three-position switchgear according to claim 1, characterized in that: The clamping claw assembly comprises a grounding blade (20), the grounding blade (20) is connected to the bottom of the outlet row (15), a stainless steel spring limiting piece (21) is arranged on the outer side of the grounding blade (20), a copper claw (22) is arranged inside the stainless steel spring limiting piece (21), an inner claw clamp (23) is arranged on the inner side of the copper claw (22), and a limiting rubber pad (24) is arranged on the outer side of the grounding blade (20).

10. A compact three-position switchgear according to claim 9, characterized in that: The transmission assembly comprises a first spur gear (25), the first spur gear (25) is arranged inside the first connecting member (1), one side of the first spur gear (25) is meshed with a second spur gear (26), the second spur gear (26) is connected to a linkage long rod (27), one end of the linkage long rod (27) is provided with an over-center spring (28), one end of the over-center spring (28) is provided with a grounding shaft (29), the outer side of the grounding shaft (29) is provided with a grounding movable knife bracket (30), and the grounding movable knife (31) is installed on the grounding movable knife bracket (30).

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