Three-position direct-acting solid insulation switchgear

Abstract

The present invention relates to a high-voltage electrical switchgear, and in particular to a three-position direct-acting solid-insulated switchgear, comprising an insulating cylinder, the insulating cylinder comprising a shell and a second conductor, a vacuum interrupter, a first conductor, a third conductor, an insulating pull rod, an isolating movable contact, an isolating insulating pull rod, a grounding static contact, and a grounding pull rod, wherein one inner end of the second conductor is connected to one end of the vacuum interrupter, the other end of the vacuum interrupter is connected to the first conductor, one inner end of the third conductor is connected to the grounding static contact, the grounding static contact is connected to the isolating movable contact, an operating mechanism pulls the grounding pull rod to bring the grounding pull rod into contact with or separate from the grounding static contact, the operating mechanism pulls the isolating insulating pull rod to bring the isolating insulating pull rod into contact with or disconnect from the first conductor, and the insulating pull rod pulls the first conductor to connect or disconnect the first conductor with the second conductor. The three-position direct-acting solid-insulated switchgear of the present invention is more environmentally friendly and has stronger insulation protection performance.

Description

Technical Field

[0001] The present invention relates to a high-voltage electrical switch device, in particular to a three-position direct-acting solid insulation switch device. Background Art

[0002] SF6 gas is often used as the insulating medium in switch housings, enclosing electrical components such as busbars, circuit breakers, and disconnectors within a chamber filled with SF6. SF6 gas is widely used in the power industry due to its excellent electrical insulation and arc-extinguishing properties. However, SF6 gas has a potential greenhouse effect that is 23,900 times greater than that of CO2, and its decomposition products are mostly toxic. Due to leaks and improper recycling, SF6 gas emissions are inevitable during use, polluting the environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a three-position direct-acting solid-insulated switchgear which is more environmentally friendly and has stronger insulation protection performance.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The three-station direct-acting solid-insulated switchgear of the present invention includes an insulating cylinder, which includes a shell and a second conductor, a vacuum interrupter, a first conductor, a third conductor, an insulating pull rod, an isolating moving contact, an isolating insulating pull rod, a grounding static contact, and a grounding pull rod arranged in the shell. The second conductor, the vacuum interrupter, the first conductor, and the third conductor are all connected to the shell, and the shell is made of insulating material. The third conductor is used to introduce current, and the second conductor is used to lead out current. One end of the inner side of the second conductor is connected to one end of the vacuum interrupter, and the other end of the vacuum interrupter is connected to the first conductor. The inner end of the third conductor is connected to the inner end of the vacuum interrupter. The end is connected to the grounding static contact, the grounding static contact is connected to the isolating moving contact, the grounding pull rod is arranged close to the grounding static contact, one end of the grounding pull rod is used to connect with the operating mechanism, the operating mechanism pulls the grounding pull rod to make the grounding pull rod contact or separate from the grounding static contact, one end of the isolating insulating pull rod is used to connect with the operating mechanism, the other end of the isolating insulating pull rod is connected to the isolating moving contact, the operating mechanism pulls the isolating insulating pull rod to make the isolating insulating pull rod contact or disconnect with the first conductor, the insulating pull rod is connected to the first conductor in the vacuum interrupter, and the insulating pull rod pulls the first conductor to connect or disconnect the first conductor with the second conductor.

[0006] Furthermore, it also includes a spring contact finger and a moving contact bracket, and a connecting through-hole is provided on the moving contact bracket, and the end of the isolating moving contact away from the first conductor passes through the connecting through-hole, and the isolating moving contact and the moving contact bracket are connected through the spring contact finger, and the isolating insulating pull rod is threadedly connected to the end of the isolating moving contact passing through the connecting through-hole.

[0007] Furthermore, an incoming line bushing and an outgoing line bushing are provided on the inner wall of the shell, the second conductor is provided in the outgoing line bushing, and the third conductor is provided in the incoming line bushing.

[0008] Furthermore, the insulating pull rod includes an insulating pull rod body and a spring. The insulating pull rod body is made of elastic material. An umbrella skirt is provided on the outer wall of the insulating pull rod body. One end of the insulating pull rod body is connected to the first conductor through a flexible connection, and the spring is connected to the other end of the insulating pull rod body.

[0009] Furthermore, the shell is cast by non-zinc-sprayed epoxy resin.

[0010] Furthermore, it also includes a temperature sensor and a detection unit. The temperature sensor is arranged in the shell near the circuit breaker, and the temperature sensor is connected to the detection unit.

[0011] Furthermore, it also includes an insulation performance detection element, which is arranged in the shell near the incoming bushing and the outgoing bushing, and is connected to the detection unit.

[0012] Furthermore, the temperature sensor, the insulation performance detection element and the shell are cast as one body.

[0013] Furthermore, it also includes a grounding column, which is arranged on the inner wall of the shell, one end of the grounding column is welded to the incoming line bushing, and the other end of the grounding column extends out of the shell.

[0014] Furthermore, a wire inlet bushing shielding net is provided at the wire inlet bushing.

[0015] Compared with the prior art, the three-position direct-acting solid-insulated switchgear of the present invention has at least the following beneficial effects:

[0016] The three-station direct-acting solid-insulated switchgear of the present invention has a second conductor, a vacuum interrupter, a first conductor, and a third conductor disposed in a housing. The second conductor, the vacuum interrupter, the first conductor, and the third conductor are connected to the housing, and the housing is made of insulating material. Therefore, solid insulation is achieved between the components in the switch. Compared with SF6 gas insulation, it is environmentally friendly and enhances the insulation protection performance and improves the waterproof effect. In addition, the second conductor, the vacuum interrupter, the first conductor, and the third conductor are all connected to the housing, achieving a modular design, with fewer parts, convenient processing, low material cost, and easy molding of the insulating cylinder housing. In addition, in the maintenance state, it is necessary to prevent the grounding switch from accidentally opening. The upper isolation mechanism needs to lock the operating buttons of the circuit breaker and the isolation at the same time, while the lower isolation of the three-station direct-acting solid-insulated switchgear of the present invention only needs to lock the isolation button to achieve protection. The grounding operation steps of the upper isolation mechanism are: opening the circuit breaker - isolating the ground - closing the circuit breaker, and the grounding operation steps of the lower isolation mechanism are: opening the circuit breaker - isolating and closing the ground. Not only are the steps simplified, but the five-protection interlocking structure is also simplified.

[0017] The three-position direct-acting solid insulated switchgear of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a three-position direct-acting solid-insulated switchgear according to the present invention;

[0019] Figure 2 The figure is a schematic structural diagram of the insulating cylinder in the three-position direct-acting solid-insulated switchgear of the present invention. DETAILED DESCRIPTION

[0020] like Figure 1 、 Figure 2As shown, the present invention provides a three-position direct-acting solid-insulated switchgear, comprising an insulating cylinder 01, a sealed middle partition 02, and an operating mechanism 03. The sealed middle partition 02 is used to seal the insulating cylinder 01 and separate the insulating cylinder 01 and the operating mechanism 03. The insulating cylinder 01 comprises a shell 11 and a second conductor 12, a vacuum interrupter 13, a first conductor 14, a third conductor 15, an insulating pull rod 21, an isolating moving contact 22, an isolating insulating pull rod 24, a grounding static contact 25, and a grounding pull rod 26 arranged in the shell 11. The shell 11 is made of an insulating material. The second conductor 12, the vacuum interrupter 13, the first conductor 14, and the third conductor 15 are connected to the shell 11. The third conductor 15 is used to introduce current, and the second conductor 12 is used to conduct current. One end of the inner side of the second conductor 12 is connected to one end of the vacuum interrupter 13. The other end of the vacuum interrupter 13 is connected to the first conductor 14, and the inner end of the third conductor 15 is connected to the grounding static contact 25, which is connected to the isolating moving contact 22. The grounding pull rod 26 is arranged close to the grounding static contact 25, and one end of the grounding pull rod 26 is used to connect with the operating mechanism. The operating mechanism pulls the grounding pull rod 26 to make the grounding pull rod 26 contact or separate from the grounding static contact 25. One end of the isolating insulating pull rod 24 is used to connect with the operating mechanism. The other end of the isolating insulating pull rod 24 is connected to the isolating moving contact 22. The operating mechanism pulls the isolating insulating pull rod 24 to make the isolating insulating pull rod 24 pull the isolating moving contact 22 to contact or disconnect with the first conductor 14. The insulating pull rod 21 is connected to the first conductor 131 in the vacuum interrupter 13, and the insulating pull rod 21 pulls the first conductor 131 to connect or disconnect the first conductor 131 with the second conductor 132. Specifically, there are three insulating cylinders 01, and the three-phase switches are respectively arranged in one insulating cylinder 01. The three-position direct-acting solid insulating switch device of the present invention introduces current through the third conductor 15, and extracts current through the second conductor 12. The grounding pull rod 26 is grounded on the outside. The grounding pull rod 26 is pulled by the operating mechanism to make the grounding pull rod 26 contact or separate from the grounding static contact 25 to achieve the grounding closing and opening state. The operating mechanism pulls the isolating insulating pull rod 24 to make the isolating insulating pull rod 24 pull the isolating movable contact 22 to contact or disconnect with the first conductor 14 to achieve isolation closing and opening. The insulating pull rod 21 is a large-value spring with insulating performance. The instantaneous impulse released by the energy storage spring of the isolation mechanism is buffered by the insulating pull rod 21, driving the insulating pull rod 21 to move up and down as a whole, thereby pulling apart or pressing the first conductor 131, so that the first conductor 131 is disconnected or connected with the second conductor 132 to achieve the opening and closing of the circuit.The present invention provides a three-station direct-acting solid-insulated switchgear. In a housing 11, a second conductor 12, a vacuum interrupter 13, a first conductor 14, and a third conductor 15 are provided. The second conductor 12, the vacuum interrupter 13, the first conductor 14, and the third conductor 15 are all connected to the housing 11. The housing 11 is made of insulating material, so solid insulation is achieved between the components in the switch. Compared with SF6 gas insulation, this is more environmentally friendly and also enhances insulation protection performance and improves waterproof effect. In addition, the second conductor 12, the vacuum interrupter 13, the first conductor 14, and the third conductor 15 are all connected to the housing 11, realizing a modular design, with fewer parts, convenient processing, low material cost, and easy molding of the insulating tube housing. In addition, in the maintenance state, it is necessary to prevent the grounding switch from accidentally opening, and the upper isolation mechanism needs to lock the circuit breaker and the isolation operation buttons at the same time. However, the lower isolation mode of the three-position direct-acting solid insulation switch device of the present invention only needs to lock the isolation button to achieve protection. The grounding operation steps of the upper isolation mechanism are: opening the circuit breaker-isolating grounding-closing the circuit breaker, and the grounding operation steps of the lower isolation mechanism are: opening the circuit breaker-isolating and closing the grounding. Not only are the steps simplified, but the five-protection interlocking structure is also simplified.

[0021] Optionally, the three-position direct-acting solid-insulated switch device of the present invention further includes a spring contact finger 27 and a moving contact bracket 23. The moving contact bracket 23 is provided with a connecting through-hole, and the end of the isolating moving contact 22 away from the first conductor 14 passes through the connecting through-hole. The spring contact finger 27 is sleeved on the outside of the isolating moving contact 22 and the moving contact bracket 23. The isolating moving contact 22 and the moving contact bracket 23 are connected through the spring contact finger 27, and the isolating insulating pull rod 24 is threadedly connected to the end of the isolating moving contact 22 passing through the connecting through-hole.

[0022] Optionally, the housing 11 includes an incoming bushing 111 and an outgoing bushing 112 , the second conductor 12 is disposed in the outgoing bushing 112 , the third conductor 15 is disposed in the incoming bushing 111 , the third conductor 15 introduces current, and the second conductor 12 conducts current.

[0023] Optionally, the three-position direct-acting solid-insulated switchgear of the present invention further includes a grounding post 04, which is disposed on the inner wall of the housing 11, one end of which is welded to the incoming bushing 111, and the other end of which extends outside the housing 11.

[0024] Optionally, an incoming bushing shielding net 05 is also provided at the incoming bushing 111 in the shell 11. The shell wall near the incoming and outgoing ports in the shell 11 for connecting to the cables is relatively thin, which is a high-incidence area of ​​insulation failure. The incoming bushing shielding net 05 has a uniform electric field and electrostatic shielding function. It is buried in the weak parts of the epoxy resin to enhance the insulation performance and prevent the shell 11 from being broken down by high voltage.

[0025] Optionally, the insulating rod 21 includes an insulating rod body 211 and a spring 212. The insulating rod body 211 is made of elastic material. An umbrella skirt 213 is provided on the outer wall of the insulating rod body 211. One end of the insulating rod body 211 is connected to the first conductor 131 through a flexible connection, and the spring 212 is connected to the other end of the insulating rod body 211.

[0026] Optionally, the housing 11 is cast from non-zinc-sprayed epoxy resin.

[0027] Optionally, the three-station direct-acting solid-insulated switchgear of the present invention further includes a temperature sensor and a detection unit. The temperature sensor is arranged in the shell 11 near the circuit breaker. The temperature sensor is connected to the detection unit and is used to sense the temperature inside the shell 11. When problems such as poor contact or oxidation aging, current-carrying failure, poor contact or excessive current occur inside the switch, causing the internal temperature of the switch to rise, the temperature sensor senses the temperature increase and transmits the temperature information to the detection unit to avoid equipment damage or fire, and to prevent problems before they occur.

[0028] Optionally, the three-position direct-acting solid-state insulated switchgear of the present invention further includes an insulation performance detection element, which is disposed within the housing 11 near the incoming and outgoing bushings 111 and 112. The insulation performance detection element is connected to the detection unit. The housing wall near the incoming and outgoing openings of the housing 11 for connecting cables is relatively thin, representing a high-incidence area for insulation failures. The insulation performance detection element is provided to monitor insulation failures in real time. The insulation detection element may be a current sensor or a voltage sensor.

[0029] Optionally, the temperature sensor, the insulation performance detection element and the housing 11 are cast as one body.

[0030] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A three-position direct-acting solid-insulated switchgear, characterized in that: The invention comprises an insulating tube (01), wherein the insulating tube (01) comprises a shell (11) and a second conductor (12), a vacuum arc extinguishing chamber (13), a first conductor (14), a third conductor (15), an insulating pull rod (21), an isolating movable contact (22), an isolating insulating pull rod (24), a grounding static contact (25), and a grounding pull rod (26) arranged in the shell (11); the second conductor (12), the vacuum arc extinguishing chamber (13), the first conductor (14), and the third conductor (15) are all connected to the shell (11); the shell (11) is made of insulating material; the third conductor (15) is used to introduce current; the second conductor (12) is used to lead out current; an inner end of the second conductor (12) is connected to one end of the vacuum arc extinguishing chamber (13); the other end of the vacuum arc extinguishing chamber (13) is connected to the first conductor (14); an inner end of the third conductor (15) is connected to the grounding static contact (25) is connected, the grounding static contact (25) is connected to the isolating moving contact (22), the grounding pull rod (26) is arranged close to the grounding static contact (25), one end of the grounding pull rod (26) is used to connect to the operating mechanism, the operating mechanism pulls the grounding pull rod (26) to make the grounding pull rod (26) contact or separate from the grounding static contact (25), one end of the isolating insulating pull rod (24) is used to connect to the operating mechanism, and the other end of the isolating insulating pull rod (24) is used to connect to the operating mechanism. One end is connected to the isolating movable contact (22), the operating mechanism pulls the isolating insulating pull rod (24) so ​​that the isolating insulating pull rod (24) pulls the isolating movable contact (22) to contact or disconnect with the first conductor (14), the insulating pull rod (21) is connected to the first conductor (131) in the vacuum interrupter (13), and the insulating pull rod (21) pulls the first conductor (131) so that the first conductor (131) is connected to or disconnected with the second conductor (132).

2. The three-position direct-acting solid-insulated switchgear according to claim 1, characterized in that: It also includes a spring contact finger (27) and a moving contact bracket (23), wherein the moving contact bracket (23) is provided with a connecting through hole, and the end of the isolating moving contact (22) away from the first conductor (14) passes through the connecting through hole, the isolating moving contact (22) and the moving contact bracket (23) are connected via the spring contact finger (27), and the isolating insulating pull rod (24) is threadedly connected to the end of the isolating moving contact (22) passing through the connecting through hole.

3. The three-position direct-acting solid-insulated switchgear according to claim 2, characterized in that: An incoming line bushing (111) and an outgoing line bushing (112) are provided on the inner wall of the housing (11); the second conductor (12) is provided in the outgoing line bushing (112); and the third conductor (15) is provided in the incoming line bushing (111).

4. The three-position direct-acting solid-insulated switchgear according to claim 3, characterized in that: The insulating pull rod (21) comprises an insulating pull rod body (211) and a spring (212). The insulating pull rod body (211) is made of elastic material. An outer wall of the insulating pull rod body (211) is provided with an umbrella skirt (213). One end of the insulating pull rod body (211) is connected to the first conductor (131) through a flexible connection, and the spring (212) is connected to the other end of the insulating pull rod body (211).

5. The three-position direct-acting solid-insulated switchgear according to claim 4, characterized in that: The housing (11) is cast from non-zinc-sprayed epoxy resin.

6. The three-position direct-acting solid-insulated switchgear according to claim 5, characterized in that: It also includes a temperature sensor and a detection unit. The temperature sensor is arranged in the housing (11) near the circuit breaker, and the temperature sensor is connected to the detection unit.

7. The three-position direct-acting solid-insulated switchgear according to claim 6, characterized in that: It also includes an insulation performance detection element, which is arranged in the housing (11) near the incoming bushing (111) and the outgoing bushing (112), and is connected to the detection unit.

8. The three-position direct-acting solid-insulated switchgear according to claim 7, characterized in that: The temperature sensor, the insulation performance detection element and the housing (11) are cast as one body.

9. The three-position direct-acting solid-insulated switchgear according to claim 8, characterized in that: It also includes a grounding column (04), which is arranged on the inner wall of the shell (11), one end of the grounding column (04) is welded to the incoming line bushing (111), and the other end of the grounding column (04) extends out of the shell (11).

10. The three-position direct-acting solid-insulated switchgear according to claim 9, characterized in that: The incoming line bushing (111) is provided with an incoming line bushing shielding net (05).

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