Visual insulation device for outdoor enclosed high voltage disconnector

Abstract

The utility model discloses a visual insulation device for outdoor closed high -tension isolator, including upper insulating tube, perspective window and lower insulating tube, high -tension isolator is enclosed in the inside, the outer wall of upper insulating tube and lower insulating tube has outer umbrella cover, and the inner wall has inner umbrella cover, the inner umbrella cover is giant wave type structure to increase the creepage distance, prolongs the discharge path and restrains internal discharge, only relies on solid insulation structure to realize electrical and internal insulation performance, the perspective window adopts quartz crystal glass sleeve pipe or organic transparent material sleeve pipe, directly with insulating tube bonding, cancels metal flange coupling, strengthens the bending strength and ultraviolet resistance ability, the isolator adopts closed operation mechanism through servo motor direct -drive isolator pull rod, realizes the switch of opening and closing, remote control stroke. The utility model does not need SF6 gas, insulating oil and other insulating medium, avoids the risk of leakage, has environmental protection, insulation reliability and mechanical durability, and the operation is simple, and the installation is convenient.

Description

Technical Field

[0001] This utility model relates to switch insulation structure, specifically to a closed, visible insulation device for outdoor high-voltage disconnect switches. Background Technology

[0002] The insulation structure of outdoor enclosed high-voltage disconnect switches includes hollow composite insulators and a visible section. The hollow composite insulator, used for insulation in high-voltage equipment, typically consists of an epoxy fiberglass tube (insulating tube) and an outer silicone rubber shed, with a hollow core for the passage of conductive rods or as the switch cavity. The visible section is used to observe the switch's open / closed state. Commonly used outdoor high-voltage disconnect switches have the following insulation structure defects.

[0003] (1) Environmental and safety defects of insulating media

[0004] Traditional 35kV ～ 1000kV outdoor high-voltage disconnect switches rely on SF6 gas, insulating oil, or other media for insulation. For example, the Chinese patent with publication number CN 214672348 U, entitled "35KV / 1000KV Full-Current Outdoor Sealed High-Voltage Disconnect Switch," discloses a transparent bushing and a supporting bushing filled with insulating gas. The transparent bushing is made of insulating transparent material, and the bushing in this patent is filled with SF6 gas. SF6 gas has a very strong greenhouse effect (its global warming potential is approximately 23,900 times that of CO2), and leakage will pollute the environment and endanger insulation performance. Insulating oil requires regular maintenance, is prone to leakage and pollution, has high sealing requirements, and is cumbersome to maintain. Neither of these methods can meet the industry's development needs for "green environmental protection + intelligent operation and maintenance."

[0005] (2) Mechanical and weathering defects of visible structures

[0006] The "visible parts" of existing visual disconnect switches mostly use metal flanges to connect transparent protective parts (such as glass covers or organic material covers). Metal flanges are susceptible to outdoor salt spray, humidity, and ultraviolet radiation, which can cause stress concentration and reduce bending strength. The connection interface between the transparent parts and the flange is difficult to seal, and long-term aging and cracking can significantly shorten the equipment's lifespan. Utility Model Content

[0007] The purpose of this utility model is to provide a visible insulation device for outdoor enclosed high-voltage disconnect switches, which does not require SF6 gas, insulating oil or other media, avoids leakage risks, and has the advantages of being environmentally friendly, having reliable insulation and mechanical durability, and being easy to operate and install.

[0008] The technical solution to achieve the purpose of this utility model is as follows:

[0009] A closed-type visual insulation device for outdoor high-voltage disconnect switches includes an upper insulating tube, a viewing window, and a lower insulating tube, which encloses the high-voltage disconnect switch inside. The outer walls of the upper and lower insulating tubes have outer umbrella sleeves, and the inner walls have inner umbrella sleeves. The inner umbrella sleeves have a giant wave-shaped structure.

[0010] Preferably, the giant wave structure refers to a waveform with a peak height of 8mm-25mm.

[0011] Preferably, for a 35kV disconnector, the inner shed crest height is 8mm, and for a 1000kV disconnector, the inner shed crest height is 25mm.

[0012] Preferably, the inner umbrella sleeve is molded from high-temperature vulcanized silicone rubber and is integrally bonded to the inner wall of the insulating tube by an adhesive.

[0013] Preferably, the high-temperature vulcanized silicone rubber molding is specifically vulcanized silicone rubber molding at 180°C.

[0014] Preferably, the viewing window is made of quartz crystal glass sleeve or organic transparent material sleeve, and both sides are directly bonded to the upper insulating tube and the lower insulating tube.

[0015] Preferably, the quartz crystal glass sleeve has a wall thickness of 5mm-15mm.

[0016] Preferably, the organic transparent material is polycarbonate or polymethyl methacrylate.

[0017] Preferably, the high-voltage disconnect switch adopts a closed servo-driven operating mechanism, which directly drives the switch insulation rod through a servo motor to open or close the disconnect switch.

[0018] Preferably, the enclosed servo drive operating mechanism includes a servo motor, a reducer, a transmission lead screw, and a stroke control module; the servo motor drives the transmission lead screw through the reducer, the transmission lead screw is connected to the switch insulating pull rod, and the stroke control module is used to limit the stroke range of the insulating pull rod.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) Environmental protection: It abandons SF6 gas and insulating oil, and achieves performance only through solid insulation, completely eliminating the risk of medium leakage and meeting the requirements of green environmental protection.

[0021] (2) Insulation reliability: The “giant wave” structure of the hollow composite insulator significantly increases the creepage distance and extends the discharge path. Combined with the uniform electric field characteristics of solid insulation, it effectively suppresses internal / surface discharge.

[0022] (3) Mechanical durability: The “glass / organic bushing direct bonding insulator” design of the visible part avoids stress corrosion and aging problems of metal flanges, and the UV resistance of quartz / organic materials greatly improves the service life.

[0023] (4) Ease of operation: Servo motor direct drive + remote control simplifies mechanical structure and reduces parts; remote control precisely adjusts the rod stroke, and only mechanical connection and electrical wiring are required during installation, making operation / debugging easier. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the enclosed visual outdoor high-voltage disconnect switch of this utility model;

[0025] Figure 2 A schematic diagram of the cross-sectional structure of a hollow composite insulator;

[0026] Figure 3 This is a schematic diagram of the transmission principle of a servo-driven operating mechanism.

[0027] Figure label:

[0028] 1-Upper flange, 2-Umbrella sleeve, 2-1-Outer umbrella sleeve, 2-2-Inner umbrella sleeve, 3-Upper insulating tube, 4-Sealing ring, 5-Conductive rod, 6-Viewing window, 7-Lower insulating tube, 8-Lower flange, 9-Moving contact, 10-Moving contact seat, 11-Insulating pull rod, 12-Terminal block, 13-Insulating sleeve, 14-Insulating support plate. Detailed Implementation

[0029] This embodiment uses, as follows: Figure 1 The 35kV shown ～ A 1000kV high-voltage disconnector includes an insulating sleeve 13, a conductive rod 5, a moving contact 9, a moving contact seat 10, an insulating pull rod 11, a terminal block 12, an insulating support plate 14, and a servo-driven operating mechanism. The moving contact portion of the conductive rod 5 is fitted with the insulating sleeve 13, and the end of the insulating sleeve 13 is provided with an upper flange 1. The end of the conductive rod 5 near the moving contact 9 serves as the stationary contact. The moving contact 9 and the moving contact seat 10 are connected. The servo-driven operating mechanism is used to drive the insulating pull rod 11, thereby causing the moving contact to slide. The switch structure is not limited to this structural form; this structure is well-known in the art and will not be described in detail here. The innovation of this solution lies in proposing a method for use with 35kV... ～ The 1000kV outdoor high-voltage disconnector has a closed, visually accessible insulation structure, including an upper insulating tube 3, a viewing window 6, and a lower insulating tube 7. The viewing window 6 allows a clear view of the disconnector's open / closed position. The upper insulating tube 3 and lower insulating tube 7 are connected to the two sides of the viewing window 6, respectively. Both the upper insulating tube 3 and lower insulating tube 7 are fitted with crystal glass sleeves. Figure 2The upper insulating tube 3 and the lower insulating tube 7 are provided with umbrella sleeves 2. The umbrella sleeves 2 include an outer umbrella sleeve 2-1 and an inner umbrella sleeve 2-2. Specifically, the outer wall of the upper insulating tube 3 and the lower insulating tube 7 is provided with an outer umbrella sleeve 2-1, and the inner wall is provided with an inner umbrella sleeve 2-2.

[0030] The inner umbrella sleeve 2-2 adopts a "giant wave" structure. The inner umbrella sleeve is made of high-temperature vulcanized silicone rubber through molding, and its surface is designed with a "giant wave" contour (achieved through the periodic distribution of wave crests / troughs in the mold). The umbrella sleeve is bonded to the inner wall of the insulating tube (epoxy fiberglass tube or silicone rubber tube) using a special silicone rubber adhesive, and special tooling (positioning mold, curing fixture) is used to ensure bonding accuracy and strength, forming an integrated solid insulation structure. The internal "giant wave" structure increases creepage distance, extends the discharge path, and suppresses internal discharge, achieving electrical and internal insulation performance solely through the solid insulation structure. This structure is formed through molding or injection molding processes. The special adhesive is a high-temperature resistant, aging-resistant silicone or epoxy resin adhesive compatible with silicone rubber and the insulating tube. Specific manufacturing processes include:

[0031] ① Umbrella cover molding: Two-component addition-curing high-temperature vulcanized silicone rubber is selected. After mixing according to the formula, it is injected into the "giant wave" mold and vulcanized at 180℃ for 30 minutes to obtain an umbrella cover with periodic peaks / troughs on the surface. The peak height of the 35kV giant wave is 8mm, and the peak height of the 1000kV giant wave is 25mm.

[0032] ② Bonding treatment: Clean the bonding surfaces of the inner wall of the insulating tube (quartz crystal glass sleeve, which needs to be roughened by grinding) and the inner umbrella sleeve 2-2 with acetone → apply RTV-Ⅱ type silicone rubber adhesive → insert the inner umbrella sleeve 2-2 into the insulating tube → place it into a special tooling (to ensure coaxiality) → cure at 80℃ for 4 hours to form an integrated structure.

[0033] The viewing window 6 uses a quartz crystal glass sleeve or an organic transparent material sleeve. The ends are pre-treated with "plasma cleaning + coupling agent coating" to enhance adhesion, and are directly bonded to the hollow composite insulator (upper insulating tube 3 and lower insulating tube 7), eliminating the need for metal flange connections and enhancing bending strength and UV resistance. The quartz crystal glass sleeve is 5mm-15mm thick, and the organic transparent material is polycarbonate or polymethyl methacrylate; the direct bonding uses weather-resistant silicone adhesive for sealing. The assembly process of the viewing window 6 includes:

[0034] ① Material: Select quartz crystal glass with a light transmittance of ≥90% (wall thickness 5-15mm) or impact-resistant PC tubing;

[0035] ② Bonding: Apply weather-resistant silicone (0.8-1.2mm thickness), use locating pins and bolts for fixation, and perform a UV aging test after 48 hours of curing (irradiation ≥2000kJ / m²). 2To verify the bonding strength and weather resistance.

[0036] Combination Figure 3 The servo drive operating mechanism is a closed-type servo drive operating mechanism, connected to the lower insulating tube 7 via the lower flange 8, with a sealing ring 4 at the connection. The closed-type servo drive operating mechanism directly drives the isolating switch lever via a servo motor, remotely controlling the stroke to open or close the isolating switch. It includes a servo motor, a reducer, a transmission screw, and a stroke control module. The servo motor drives the transmission screw via the reducer, and the transmission screw is connected to the insulating pull rod 11. The stroke control module is used to limit the stroke range of the transmission screw to achieve precise opening or closing control. The assembly process of the servo drive operating mechanism specifically includes:

[0037] ① Transmission mechanism assembly: The servo motor (selection: rated torque 6N·m, rated speed 1500rpm) is connected to the input shaft of the reduction gear set (reduction ratio 1:20) through a coupling → the output shaft of the gear set is fixed to one end of the lead screw (lead 8mm) → the lead screw nut is screwed to the end of the pull rod (45# steel chrome plated).

[0038] ② Control module integration: Install a servo driver, PLC controller, and GPRS remote module in the control box → The PLC communicates with the driver via the CAN bus, and drives the motor to rotate forward and backward after receiving remote commands → The linear displacement sensor detects the rod stroke in real time and feeds it back to the PLC to achieve closed-loop control (stroke error ≤ ±1mm).

[0039] The servo motor directly drives the disconnect switch lever (or drives the energy storage spring to release kinetic energy to achieve rapid opening) through a reduction gear set / screw transmission mechanism. The lever stroke is precisely controlled by a photoelectric encoder / limit switch. The operation command is transmitted to the control unit through a remote communication module (4G / 5G, industrial Ethernet) to realize the "open / close" action.

[0040] After assembly, during the joint debugging test, the insulators (upper insulating tube 3 and lower insulating tube 7), the viewing window 6, and the servo drive operating mechanism are set up... Figure 1 Mechanical connection → Check coaxiality and sealing → Power-on test motor operation, lever stroke control, and reliability of disconnecting switch opening and closing → Simulate salt spray and ultraviolet aging tests to verify durability.

[0041] The hollow composite insulator, visible connection structure, and enclosed servo drive operating mechanism are integrated into a single design, reducing external connection components and improving the overall sealing and mechanical stability of the device.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual insulation device for an outdoor enclosed high-voltage disconnecting switch, comprising an upper insulating tube, a viewing window, and a lower insulating tube, enclosing the high-voltage disconnecting switch internally, characterized in that, The upper and lower insulating tubes have outer umbrella sleeves on their outer walls and inner umbrella sleeves on their inner walls, and the inner umbrella sleeves have a giant wave-shaped structure.

2. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 1, characterized in that, The giant wave structure refers to a waveform with a peak height of 8mm-25mm.

3. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 2, characterized in that, For 35kV disconnectors, the inner shed crest height is 8mm; for 1000kV disconnectors, the inner shed crest height is 25mm.

4. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 1, characterized in that, The inner umbrella sleeve is molded from high-temperature vulcanized silicone rubber and is integrally bonded to the inner wall of the insulating tube by an adhesive.

5. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 4, characterized in that, The high-temperature vulcanized silicone rubber molding specifically refers to the molding of silicone rubber at 180°C.

6. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 1, characterized in that, The viewing window is made of quartz crystal glass or organic transparent material, and is directly bonded to the upper and lower insulating tubes on both sides.

7. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 6, characterized in that, The quartz crystal glass sleeve has a wall thickness of 5mm-15mm.

8. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 6, characterized in that, The organic transparent material is made of polycarbonate or polymethyl methacrylate.

9. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 1, characterized in that, The enclosed high-voltage disconnect switch adopts a servo-driven operating mechanism, which directly drives the switch insulation rod through a servo motor to open or close the disconnect switch.

10. A visual insulation device for an outdoor enclosed high-voltage disconnector according to claim 9, characterized in that, The enclosed servo-driven operating mechanism includes a servo motor, a reducer, a lead screw, and a stroke control module; the servo motor drives the lead screw through the reducer, the lead screw is connected to the switch insulating pull rod, and the stroke control module is used to limit the stroke range of the insulating pull rod.

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