CN104577859A - Solid insulated switch module of solid insulated switch equipment - Google Patents

Abstract

The invention relates to a solid insulated switch module for solid insulated switchgear, which belongs to the field of electromechanical equipment and includes a mechanism box, an arc extinguishing chamber operating mechanism, an isolation and grounding operating mechanism, an arc extinguishing chamber transmission device, an isolation and grounding transmission device, and a main insulator , Observation window, insulating pull rod of arc extinguishing chamber, vacuum interrupting chamber, charged display sensor, conductive rod of incoming and outgoing lines, bushing of incoming and outgoing lines, soft connection, static contact on the side of arc extinguishing chamber, moving contact, conductive rod on busbar side, main Bus bushing, bus side static contact, guide plate, insulating tie rod, guide groove, grounding conductive rod, sealing ring. The invention is a unit modular structure in the form of a three-pole common mechanism, which is simple in structure, compact, maintenance-free, fully insulated, fully sealed, strong in anti-pollution ability, and the outer surface can be touched; it uses a vacuum interrupter to extinguish arcs, small in size and excellent in insulation performance. Reliable, standardized modules, safe and reliable, easy to operate, maintenance-free and at the same time reduce the size of the equipped switchgear.

Description

A solid insulated switch module for solid insulated switchgear

technical field

The invention belongs to the field of electromechanical equipment, in particular to a solid insulation switch module used for solid insulation switch equipment.

Background technique

In the current switchgear industry, medium-voltage switchgear has been widely used, and most of its insulation schemes use air insulation and SF ₆ (sulfur hexafluoride) gas insulation. The air-insulated switchgear is relatively large in size and takes up a lot of space. SF ₆ gas is also widely used due to its excellent arc extinguishing properties, but SF ₆ gas can decompose toxic gas under the action of arc, which is extremely harmful to human body and environment. The "Kyoto Protocol" clearly stipulates that SF ₆ gas is one of the six greenhouse gases, and there are clear restrictions on its use and emission; and in relatively closed places of use, the leakage of SF ₆ gas from SF ₆ gas-insulated ring network cabinets and its The decomposed products are not easy to spread, which will cause poisoning, suffocation and other injuries to the people in the environment, and cause great pollution to the atmospheric environment.

Therefore, a new technical solution is badly needed in the prior art to solve this problem.

Contents of the invention

The technical problem to be solved by the present invention is to provide a solid insulated switch module for solid insulated switchgear, which is used to solve the problem that the air insulated switchgear is relatively large in size and occupies a large space, and the SF ₆ gas insulated switchgear is affected by the arc. Toxic gas can be decomposed, which will cause great harm to the human body and the environment and other technical problems.

A solid insulated switch module for solid insulated switchgear, comprising a mechanism box, an arc extinguishing chamber operating mechanism, an isolated grounding operating mechanism, an arc extinguishing chamber transmission, an isolated grounding transmission, a main insulator, an observation window, and an arc extinguishing chamber Insulation rod, vacuum interrupter, live display sensor, incoming and outgoing conductor rod, incoming and outgoing bushing, flexible connection, static contact on the side of the interrupter, moving contact, conductive rod on the busbar side, main busbar bushing, static on the busbar side Contacts, guide plates, insulating pull rods, guide grooves, grounding conductive rods, and sealing rings. The arc extinguishing chamber operating mechanism, isolated grounding operating mechanism, arc extinguishing chamber transmission device, and isolated grounding transmission device are fixedly installed inside the mechanism box; The operating mechanism of the arc extinguishing chamber is connected to the transmission device of the arc extinguishing chamber through a transmission shaft; the isolated grounding operating mechanism is connected to the transmission device of the isolated grounding through a transmission shaft; the main insulator is fixed to the bottom of the mechanism box through bolts and sealing rings, The number of main insulators is 3, which are respectively used in A, B, and C three-phase branch busbar systems. There is a cavity inside the main insulator, and a through hole is provided on the front side wall of the main insulator; the observation window completely covers the main insulator and fixed on the outer surface of the front end of the main insulator through bolts and sealing rings; the upper part of the arc extinguishing chamber insulating rod is connected to the arc extinguishing chamber transmission device, and the lower part of the arc extinguishing chamber insulating rod is provided with a connecting screw. The connecting screw is fixedly connected to the moving end of the vacuum interrupter after passing through the soft connection; the vacuum interrupter is arranged at the front of the bottom of the inner cavity of the main insulator, with the moving end of the vacuum interrupter facing upwards and the static end facing downwards; The sensing part of the charged display sensor is a φ50 shielding net, and the φ50 shielding net is set outside the conductive rod of the incoming and outgoing lines, and the display part of the charged display sensor is connected to the outside through an M4 threaded hole; the conductive rod of the incoming and outgoing lines is arranged on the incoming and outgoing line sleeve In the tube, one end of the conductive rod of the incoming and outgoing lines is connected to the static end of the vacuum interrupter through bolts, and the other end is provided with an internal thread; the incoming and outgoing line casing is located at the lower part of the front end of the main insulator, forming a cone protruding from the front surface of the main insulator. platform; one end of the soft connection is fixed between the insulating pull rod of the arc extinguishing chamber and the vacuum interrupter, and the other end is fixed between the static contact on the side of the arc extinguishing chamber and the embedded nut at the bottom of the inner cavity of the main insulator; the extinguishing The static contact on the arc chamber side is fixedly connected to the embedded nut at the bottom of the inner cavity of the main insulator through bolts through the soft connection; It is slidingly connected to the outer surface of the static contact on the side of the arc extinguishing chamber, and the inner surface of the other end is slidingly connected to the outer surface of the static contact on the bus side; The other end is provided with an internal thread; the main bus sleeve is located at the lower part of the rear end of the main insulator, forming a conical truncated protruding from the surface of the rear lower end of the main insulator; the static contact on the bus side is fixed on the bus side conductive rod The upper end; the guide plate is fixed on the upper part of the moving contact, and the two sides of the guide plate are provided with 4 protruding parts, which slide in the guide groove; the upper end of the insulating pull rod is connected with the isolation grounding transmission device, and the insulating pull rod The lower end of the bolt is fixedly connected with the moving contact ; The guide grooves are located on both sides of the inner cavity of the main insulator, and are symmetrically arranged on the left and right, with a total of 4 tracks; The inner surface of the static contact is slidingly connected.

The material of the main insulator is epoxy resin, which is poured by automatic pressure gel technology.

Four M8 copper embedded nuts are distributed on the root end face of the inlet and outlet sleeves on the main insulator.

The outer surface of the main insulator is coated with a galvanized layer or a semi-conductive layer, wherein the outer surface of the inlet and outlet bushings, the outer surface of the main busbar bushing, the joint surface of the observation window and the main insulator, and the outside of the live display sensor are threaded with M4 There is no such coating layer on the surface of a circular boss with a hole as the center and a radius of 1.2 cm.

The vacuum interrupter is a vacuum interrupter for a circuit breaker or a vacuum interrupter for a load switch.

The outer surface of the vacuum interrupter is covered with silicone rubber.

The inlet and outlet bushings and main busbar bushings are all 630A IEC European standard tapered bushings.

The outer surface of the moving contact is covered with a silicon rubber insulating layer or an insulating powder vulcanized layer.

By adopting the above technical scheme, the present invention can bring the following beneficial effects:

1. The invention has a unique design and fully meets the requirements for use of 12kV and 24kV switchgear; a sealing ring is provided on the upper part of the main insulator, which is convenient to connect and fix with the mechanism box, and ensures the sealing of the insulating cylinder, so the anti-pollution ability is greatly enhanced; The vacuum interrupter is used to extinguish the arc, the volume is small, the insulation performance is reliable, the module is standardized, the use is safe, the maintenance is free, and the volume of the switchgear is reduced at the same time.

2. The isolating switch is composed of a static contact on the side of the busbar, a static contact on the side of the arc extinguishing chamber, and a moving contact. The moving contact moves up and down. , The surface shape of the static contact is cylindrical, and the electric field distribution of this structure is uniform, which well avoids the occurrence of electric field concentration. The silicone rubber insulation layer on the surface of the moving contact is also conducive to strengthening the overall insulation performance of the switch module.

3. The grounding switch is composed of a grounding conductive rod and a static contact on the side of the arc extinguishing chamber. The grounding conductive rod moves up and down, which is a direct-acting grounding switch. The distribution is uniform, and the occurrence of electric field concentration is well avoided.

4. The main insulator is made of epoxy resin poured with automatic pressure gel technology (APG), and the vacuum interrupter, live display sensor, conductive rod for incoming and outgoing lines, conductive rod for busbar side and other components are sealed in the insulating cylinder. , the insulation form of solid insulating medium is adopted, which avoids the occurrence of problems such as pollution of the atmospheric environment by SF ₆ gas and its decomposition products.

5. The outer surface of the main insulator is coated with a galvanized layer or a semi-conductive layer, and the outer surface of the insulating cylinder is grounded, which has the functions of uniform electric field, avoiding charge accumulation, suppressing short-circuit faults between phases and preventing operators from getting an electric shock, and overcomes the current gas insulation ring. Insufficient phase-to-phase insulation and arc-extinguishing medium of the network cabinet, the parts accessible to people can be touched, which improves the insulation reliability and safety of use.

6. The vacuum interrupter is sealed in the lower part of the front side of the main insulator inner cavity, and its outer surface is covered with silicone rubber material, which completely eliminates the outer surface of the insulating ceramic outside the arc extinguisher or the thickness direction of the ceramic caused by the air gap. The problem of breakdown by high voltage occurs. In addition, the silicone rubber encapsulated in the arc extinguishing chamber is used as an elastic insulating buffer layer, which solves the problem of relative movement between the epoxy resin in the solid-sealed insulator and the ceramic material of the arc extinguishing chamber due to thermal expansion and contraction, thereby destroying the insulation performance and being damaged by high-voltage electricity. breakdown problem.

7. The setting of the charged display sensor can intuitively know whether the electrical equipment has operating voltage.

8. The three phases of the main insulator are independent, and each phase seals the primary conductive circuit and the vacuum interrupter (for circuit breaker or load switch) inside the insulating medium, and the connection between the conductive rod of the incoming and outgoing lines and the static end of the vacuum interrupter is added. The shielding cover plays a good role in shielding the electric field and making the electric field evenly distributed.

9. The M8 copper embedded nuts set around the inlet and outlet bushings are used for fixing the main insulator, and can also be used for fixing the matching current transformer.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of the present invention.

Fig. 2 is a schematic front view of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the present invention when the arc extinguishing chamber is closed, the isolating switch is closed, and the grounding switch is opened.

Fig. 4 is a schematic cross-sectional structure diagram of the present invention when the interrupter is off, the isolating switch is off, and the grounding switch is off.

Fig. 5 is a schematic cross-sectional structure diagram of the present invention when the arc extinguishing chamber is closed, the isolating switch is opened, and the grounding switch is closed.

In the figure, 1 is the mechanism box, 2 is the operating mechanism of the arc extinguishing chamber, 3 is the isolation and grounding operating mechanism, 4 is the transmission device of the arc extinguishing chamber, 5 is the isolation and grounding transmission device, 6 is the main insulator, 7 is the observation window, 8 Insulation pull rod for the arc extinguishing chamber, 9 for the vacuum interrupter, 10 for the live display sensor, 11 for the conductive rod of the incoming and outgoing lines, 12 for the bushing of the incoming and outgoing lines, 13 for the soft connection, 14 for the static contact on the side of the arc extinguishing chamber, 15 is the moving contact, 16 is the busbar side conductive rod, 17 is the main busbar bushing, 18 is the busbar side static contact, 19 is the guide plate, 20 is the insulating pull rod, 21 is the guide groove, 22 is the grounding conductive rod, 23 is sealing ring.

Detailed ways

As shown in the figure, the present invention is a solid insulated switch module for solid insulated switchgear, which is characterized in that it includes a mechanism box 1, an arc extinguishing chamber operating mechanism 2, an isolation grounding operating mechanism 3, and an arc extinguishing chamber transmission device 4 , isolated grounding transmission device 5, main insulator 6, observation window 7, arc extinguishing chamber insulation pull rod 8, vacuum interrupter 9, live display sensor 10, incoming and outgoing line conductive rod 11, incoming and outgoing line casing 12, soft connection 13, extinguishing Arc chamber side static contact 14, moving contact 15, busbar side conductive rod 16, main busbar bushing 17, busbar side static contact 18, guide plate 19, insulating pull rod 20, guide groove 21, grounding conductive rod 22, seal Circle 23.

The mechanism box 1 is equipped with an arc extinguishing chamber operating mechanism 2, an isolation grounding operating mechanism 3, an arc extinguishing chamber transmission device 4, and an isolation grounding transmission device 5, so as to realize the closing and opening of the vacuum interrupter, the isolation switch and the grounding switch. gate function; the inside of the main insulator 6 is provided with a cavity, and the inner wall of the cavity is symmetrically provided with four guide grooves 21; The static end of the vacuum interrupter is connected with the conductive rod 11 of the incoming and outgoing lines by bolts; the moving end of the vacuum interrupter 9 is connected with the soft connection 13 and the lower end of the insulating rod 8 of the interrupter; the sleeve of the incoming and outgoing line 12 is located on the main insulator The lower part of the front end of 6 constitutes a truncated cone protruding from the surface of the front end of the main insulator 6; the upper end of the insulating pull rod 8 of the arc extinguishing chamber is connected to the arc extinguishing transmission device 4; Screws are fixed on the bottom of the inner cavity of the main insulator 6; the main busbar casing 17 is located at the lower part of the rear part of the main insulator 6, forming a truncated cone protruding from the lower end surface of the main insulator 6; the busbar side conductive rod 16 is located at the main busbar casing 17 Inside, and both ends are provided with threaded holes; the bus side static contact 18 is fixed on the upper end of the bus side conductive rod 16 in the cavity of the main insulator 6 by screws; the moving contact 15, the guide plate 19 and the insulating pull rod 20 The moving contact assembly is combined by bolts; the upper end of the insulating pull rod 20 is connected to the isolated grounding transmission device 5; the upper end of the grounding conductive rod 22 is connected to the isolated grounding transmission device 5; the upper end surface of the main insulator 6 is provided with an annular sealing groove , sealing ring 23 is housed in the sealing groove.

The arc extinguishing chamber operating mechanism 2 is a vacuum interrupting chamber operating mechanism for a circuit breaker or a vacuum interrupting chamber operating mechanism for a load switch.

The observation window 7 is fixedly installed on the outside of the front through hole of the main insulator 6 through screws and sealing rings. Through the observation 6, it can be clearly observed whether the moving contact is in the opening position.

The vacuum interrupter 9 is a vacuum interrupter for a circuit breaker or a vacuum interrupter for a load switch.

The outer surface of the vacuum interrupter 9 is covered with silicone rubber.

A shielding cover is added at the junction of the static end of the vacuum interrupter 9 and the conductive rod 11 of the incoming and outgoing lines, which has a good electric field shielding effect.

The vacuum interrupter 9 moves up and down by operating the operating mechanism 2 of the interrupter, and then drives up and down through the transmission device 4 of the interrupter and the insulating pull rod 8 of the interrupter, so as to realize the closing and opening functions of the circuit breaker or load switch. As shown in Figure 3, Figure 4, and Figure 5.

The movable contact 15 moves up and down by operating the isolation grounding operating mechanism 3 , and then driven by the isolation grounding transmission device 5 and the insulating pull rod 2 , so as to realize the closing and opening functions of the isolating switch. As shown in Figure 3, Figure 4, and Figure 5.

The grounding conductive rod 22 moves up and down by operating the isolated grounding operating mechanism 3 , and then driven up and down by the isolated grounding transmission device 5 , so as to realize the closing and opening functions of the grounding switch. As shown in Figure 3, Figure 4, and Figure 5.

The guide plate 19 is fixed together with the movable contact 15, and the guide plate 19 moves up and down along the guide groove 21 on the inner wall of the cavity of the main insulator 6, thereby ensuring that the movable contact 15 can move vertically up and down, and ensuring that the movable contact 15 and the arc extinguishing The room-side static contact 14 and the bus-side static contact 18 are reliably closed.

The outer surface of the moving contact 15 is covered with a layer of silicon rubber insulating layer or insulating powder vulcanized layer, which increases the insulating performance and electric field shielding effect.

On the end face of the root of the inlet and outlet bushings on the main insulator 6, there are 4 M8 copper embedded nuts distributed, which are used for fixing the main insulator 6, and can also be used for the fixed installation of the associated current transformer.

The outer surface of the main insulator 6 is coated with a galvanized layer or a semi-conductive layer, and the outer surface of the insulating cylinder is grounded, which has the functions of uniform electric field, avoiding charge accumulation, suppressing phase-to-phase short-circuit faults and preventing operators from getting an electric shock, and overcomes the current gas insulation problem. Insufficient phase-to-phase insulation and arc-extinguishing medium of the ring network cabinet, the parts accessible to people can be touched, which improves the reliability of insulation and the safety of use.

The inlet and outlet bushings 12 and the main busbar bushing 17 are all 630A IEC European standard tapered bushings, and this design is more suitable for the standardization, matching and installation of cable accessories and main busbar systems.

The invention is a solid insulated switch module used for solid insulated switchgear, which can be used as an incoming line circuit or an outgoing line circuit. Each unit includes a three-phase identical branch bus system and a three-phase shared operating mechanism, which belongs to Unit modular structure in the form of three-pole common mechanism, all charged bodies are placed in the main insulator 6, the external interfaces are connected to the main busbar through standard European cable accessories, and the outer surface of the main insulator 6 is coated with galvanized layer or semi-conductive layer , and reliable grounding, the live parts are fully insulated and fully sealed, which improves the insulation reliability and safety in use, and the protection level is IP67. It has the advantages of small size, environmental protection, functional integration, high reliability, and maintenance-free, which overcomes the current Insulation and gas-insulated ring network cabinets are deficient in phase-to-phase insulation and arc-extinguishing medium, and avoid the pollution of the atmosphere and the _{harm to the human body caused by the use of SF 6 gas} and its decomposition products or leakage.

Claims (8)

1. for a solid insulation switch module for solid-state insulated switchgear, it is characterized in that: comprise mechanism's casing (1), arc control device operating mechanism (2), isolation ground connection operating mechanism (3), arc control device transmission device (4), isolation ground connection transmission device (5), main insulation body (6), observation window (7), arc control device insulated tension pole (8), vacuum interrupter (9), charged display transducer (10), line conducting rod (11), inlet-outlet sleeve (12), be flexible coupling (13), arc control device side fixed contact (14), moving contact (15), bus bar side conducting rod (16), main bus bar sleeve pipe (17), bus bar side fixed contact (18), guide plate (19), insulated tension pole (20), gathering sill (21), ground connection conducting rod (22), sealing ring (23), described mechanism casing (1) inside is installed with arc control device operating mechanism (2), isolation ground connection operating mechanism (3), arc control device transmission device (4) and isolation ground connection transmission device (5), described arc control device operating mechanism (2) is connected with arc control device transmission device (4) by power transmission shaft, described isolation ground connection operating mechanism (3) is connected with isolation ground connection transmission device (5) by power transmission shaft, described main insulation body (6) is fixed on mechanism's casing (1) bottom by bolt and sealing ring (23), the quantity of main insulation body (6) is 3, be respectively used to A, B, C three-phase separate branch bus system, main insulation body (6) inside is provided with cavity, and the front side wall of main insulation body (6) is provided with through hole, described observation window (7) covers the through hole on main insulation body (6) completely, and is fixedly installed in the leading exterior surface of main insulation body (6) by bolt and sealing ring (23), the top of described arc control device insulated tension pole (8) is connected with arc control device transmission device (4), the bottom of arc control device insulated tension pole (8) is provided with connecting screw rod, and connecting screw rod is fixedly connected with the moved end of vacuum interrupter (9) afterwards through be flexible coupling (13), described vacuum interrupter (9) is arranged at the front portion at the bottom of main insulation body (6) inner chamber, and upward, quiet end down in the moved end of vacuum interrupter (9), the inductive means of described charged display transducer (10) is φ 50 gauze screen, φ 50 gauze screen is enclosed within the outside of line conducting rod (11), and the display unit of charged display transducer (10) is connected with outside by M4 screwed hole, described line conducting rod (11) is arranged in inlet-outlet sleeve (12), and one end of line conducting rod (11) is connected by the quiet end of bolt with vacuum interrupter (9), and the other end is provided with internal thread, described inlet-outlet sleeve (12) is positioned at the bottom of main insulation body (6) front end, forms the frustum of a cone protruding from main insulation body (6) front-end surface, described one end being flexible coupling (13) is fixed between arc control device insulated tension pole (8) and vacuum interrupter (9), and the other end is fixed between the embedded nut of arc control device side fixed contact (14) and main insulation body (6) intracavity bottom, described arc control device side fixed contact (14) is fixedly connected with the embedded nut of main insulation body (6) intracavity bottom through be flexible coupling (13) afterwards by bolt, described moving contact (15) is fixedly connected with insulated tension pole (20) with guide plate (19) respectively by bolt, the inner surface of moving contact (15) one end and the outer surface of arc control device side fixed contact (14) are slidably connected, and the inner surface of the other end and the outer surface of bus bar side fixed contact (18) are slidably connected, described bus bar side conducting rod (16) is arranged in main bus bar sleeve pipe (17), and its upper end is connected with bus bar side fixed contact (18), and the other end is provided with internal thread, described main bus bar sleeve pipe (17) is positioned at the bottom of main insulation body (6) rear end, forms the frustum of a cone protruding from main insulation body (6) surface, posterior end, described bus bar side fixed contact (18) is fixed on the upper end of bus bar side conducting rod (16), described guide plate (19) is fixed on moving contact (15) top, and two sides of guide plate (19) are provided with 4 juts, and this jut slides in gathering sill (21), the upper end of described insulated tension pole (20) is connected with isolation ground connection transmission device (5), and the lower end of insulated tension pole (20) is fixedly connected with moving contact (15) by bolt, described gathering sill (21) is positioned in main insulation body (6) inner chamber both side surface, is symmetrically arranged, totally 4 roads, the upper end of described ground connection conducting rod (22) is connected with isolation ground connection transmission device (5), ground connection conducting rod (22) when moving to lower end and the inner surface of arc control device side fixed contact (14) be slidably connected.

2. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1, is characterized in that: the material of described main insulation body (6) is epoxy resin, adopts automatic pressure gelation process cast to form.

3. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1 and 2, it is characterized in that: on the root end face of the inlet-outlet sleeve (12) on described main insulation body (6), be distributed with 4 M8 copper embedded nuts.

4. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1 and 2, it is characterized in that: described main insulation body (6) outer surface has zinc coat or semi-conductive layer, wherein the faying face of the outer surface of the outer surface of inlet-outlet sleeve (12), main bus bar sleeve pipe (17), observation window (7) and main insulation body (6) and charged display transducer (10) outside with M4 screwed hole for the center of circle with 1.2cm be radius round boss face on not this coat.

5. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1, is characterized in that: described vacuum interrupter (9) is circuit breaker vacuum interrupter or vacuum arc extinguishing chamber for loading switch.

6. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1 or 5, is characterized in that: described vacuum interrupter (9) outer surface adopts silicon rubber to carry out encapsulate.

7. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1, is characterized in that: described inlet-outlet sleeve (12), main bus bar sleeve pipe (17) are the European standard taper of IEC of 630A.

8. a kind of solid insulation switch module for solid-state insulated switchgear according to claim 1, is characterized in that: described moving contact (15) outer surface is coated with one deck silicone rubber insulation layer or insulating powder sulfuric horizon.