A controllable current generating device for 10kV medium voltage distribution network line ice melting

Abstract

The utility model discloses a controllable current generating device for 10kV medium voltage distribution network line ice melting, including the isolation protection box and the current generating equipment for realizing alternating current output, the side of current generating equipment is provided with the flange integration bushing of going into the isolation protection box, the inside of flange integration bushing is provided with the electrically conductive rod, current generating equipment is provided with two groups of taps, the inside of isolation protection box is provided with two groups of tapping switch and a group of controllable high voltage switch for realizing current regulation, two groups of taps are connected with the input end of two groups of tapping switch respectively through the electrically conductive rod of flange integration bushing, and the output end of two groups of tapping switch is connected with the input end of controllable high voltage switch, the high voltage side of controllable high voltage switch is connected with high voltage flexible cable through elbow type protection wiring terminal, the inside of isolation protection box still is provided with the cable reel for winding high voltage flexible cable. The utility model discloses can carry out safe and reliable ice melting to 10kV medium voltage distribution network line.

Description

Technical Field

[0001] This utility model relates to the field of ice melting technology for medium-voltage distribution network lines, specifically to a controllable current generating device for ice melting of 10kV medium-voltage distribution network lines. Background Technology

[0002] With changing climate conditions and recurring abnormal weather, freezing rain and snow disasters have adverse effects on power distribution lines. In particular, in some high-altitude and cold regions, the increased snowfall has increased the risk of line icing. Accidents caused by line icing, such as line short circuits, tower collapses, conductor galloping, and flashovers, occur frequently. Line icing disasters have a serious impact on the safe operation of the power grid and cause huge losses to society.

[0003] Currently, de-icing technologies mainly include mechanical de-icing and thermal de-icing. Mechanical de-icing poses risks such as mechanical injury and falling ice during the de-icing process, affecting personal safety and line safety. Thermal de-icing mainly includes DC de-icing and AC de-icing.

[0004] DC de-icing requires disconnecting the distribution transformers on the line. Connecting DC equipment to the line without disconnecting may affect the current path and distribution during the de-icing process, leading to poor de-icing results or safety hazards. 10kV medium-voltage distribution networks are AC systems with numerous distribution transformers; therefore, DC de-icing is not suitable for 10kV medium-voltage distribution networks.

[0005] AC de-icing is mostly used for de-icing 10kV medium-voltage distribution lines. Since the system is AC, there is no need to shut down the line; de-icing can be performed directly by connecting the equipment while it is energized. However, most de-icing reactors currently in use adopt a top-wiring method. If used directly outdoors for live operation, there are multiple high-voltage live points, posing a risk of electric shock, and the protection and isolation effects are not good. If a large enclosure is added, it will be inconvenient for transportation. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a controllable current generating device for de-icing 10kV medium-voltage distribution network lines, which can safely and reliably de-ic the 10kV medium-voltage distribution network lines.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0008] A controllable current generating device for de-icing 10kV medium-voltage distribution lines includes an isolation protection box and a current generating device for AC output. The side of the current generating device is provided with an integrated flange sleeve that penetrates into and is sealed to the isolation protection box. A conductive rod is installed inside the integrated flange sleeve. The current generating device has two sets of taps. The isolation protection box contains two sets of set-connected switches for current regulation and one set of controllable high-voltage switches. The two sets of taps are connected to the input terminals of the two set-connected switches via the conductive rod of the integrated flange sleeve. The output terminals of the two set-connected switches are connected to the input terminal of the controllable high-voltage switch. The high-voltage side of the controllable high-voltage switch is connected to a high-voltage flexible cable for splicing to an overhead distribution line via an elbow-type protective terminal block. The isolation protection box also contains a cable winding reel for winding the high-voltage flexible cable.

[0009] Preferably, the integrated flange sleeve is a dry high-voltage sleeve that can avoid oil leakage along the conductive rod caused by horizontal movement. The end of the integrated flange sleeve away from the current generating equipment passes through the mounting hole opened on the isolation protection box and is fixed inside the isolation protection box by the flange reinforcing bolts.

[0010] Preferably, the isolation and protection box has a side chamber on one side, which is divided into a high-voltage cable junction box and a cable winding reel protection box by a horizontally arranged insulating plate. The elbow-type protective terminal is installed in the upper part of the high-voltage cable junction box. The end of the elbow-type protective terminal outside the high-voltage cable junction box is connected to the controllable high-voltage switch, and the end of the elbow-type protective terminal inside the high-voltage cable junction box is connected to the high-voltage flexible cable. The insulating plate has a through hole for the high-voltage flexible cable to pass through. The cable winding reel is installed inside the cable winding reel protection box, and the high-voltage flexible cable is vertically led to the cable winding reel through the through hole.

[0011] Preferably, the cable winding reel protective box is provided with a door for leading out the high-voltage flexible cable.

[0012] Preferably, the secondary side of the controllable high-voltage switch and tap changer is connected to a flexible control device for supporting flexible remote and local control, and the secondary wires between the secondary side of the controllable high-voltage switch and tap changer and the flexible control device are connected and fixed by quick-connect plugs.

[0013] Preferably, the isolation and protection box is equipped with a flexible control device box, the flexible control device is installed in the flexible control device box, and the flexible control device is wirelessly connected to a handheld mobile terminal.

[0014] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0015] This invention features a current generating device with two sets of taps. By controlling the tap changer and the controllable high-voltage switch, the de-icing current can be flexibly adjusted to achieve de-icing operations under two different current conditions. The current generating device and the isolation protection box are organically integrated using a flange-integrated sleeve, achieving a compact design that avoids oil leakage and effectively isolates the high-voltage live parts from the outside environment, ensuring personal safety. The use of an elbow-type connection for the high-voltage flexible cable ensures high-voltage protection safety and achieves a miniaturized isolation protection box design. Furthermore, storing the high-voltage flexible cable in the cable reel inside the box reduces disassembly and wiring, preventing cable damage. Connecting the tap changer and the controllable high-voltage switch to the flexible control device via quick-connect plugs enables rapid wiring, improving wiring accuracy and reliability. Remote and local control of the flexible control device allows for flexible deployment and deactivation of the current generating device. Since this invention is an AC device, de-icing operations can be performed directly by connecting it to the power grid without power outages. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a side view of the present invention.

[0017] Among them: 1. Current generating equipment, 2. Integrated flange sleeve, 3. Flange reinforcing bolt, 4. Isolation and protection box, 5. Controllable high-voltage switch, 6. Tap changer, 7. High-voltage cable junction box, 8. Elbow-type protective terminal block, 9. Insulating board, 10. Cable winding reel protection box, 11. Cable winding reel, 12. Flexible control equipment, 13. Handheld mobile terminal. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] A controllable current generating device for de-icing 10kV medium-voltage distribution network lines, combined with Figures 1 to 3As shown, the device includes a current generating device 1 and an isolation protection box 4. The current generating device 1 is used to provide AC output. A flange integrated sleeve 2 is installed on the side of the current generating device 1, which extends into and is sealed to the isolation protection box 4. A conductive rod is installed inside the flange integrated sleeve 2, and the current generating device 1 has two sets of taps. The isolation protection box 4 contains two sets of tap changers 6 and one set of controllable high-voltage switches 5, which are used for current regulation. The two sets of taps are connected to the input terminals of the two sets of tap changers 6 via the conductive rods of the flange integrated sleeve 2, and the output terminals of the two sets of tap changers 6 are connected to the input terminals of the controllable high-voltage switches 5. The high-voltage side of the controllable high-voltage switch 5 is connected to a high-voltage flexible cable via an elbow-type protective terminal block 8, which is used to connect to an overhead power distribution line. The isolation protection box 4 also contains a cable winding reel 11 for winding the high-voltage flexible cable.

[0020] The current generating device 1 has its side-mounted terminals connected via an integrated flange sleeve 2. The integrated flange sleeve 2 is a dry-type high-voltage sleeve, which avoids oil leakage along the conductive rod caused by horizontal movement. The end of the integrated flange sleeve 2 furthest from the current generating device 1 is installed inside the isolation protection box 4 through a mounting hole, effectively isolating it from the outside environment. The integrated flange sleeve 2 fits tightly to the isolation protection box 4 and is fixed with flange reinforcing bolts 3, ensuring connection strength and sealing reliability. The integrated flange sleeve 2 design allows the current generating device 1 to be placed exposed without the need for enclosure protection, as there are no external live parts.

[0021] The isolation and protection box 4 is made of high-strength, corrosion-resistant stainless steel. Inside the isolation and protection box 4, there are high-voltage cable junction box 7, cable winding reel protection box 10 and flexible control equipment box.

[0022] The isolation and protection box 4 has a side chamber on one side, which is divided into a high-voltage cable junction box 7 and a cable winding reel protection box 10, which are arranged vertically, by a horizontally arranged insulating plate 9. An elbow-type protective terminal block 8 is installed on the upper part of the high-voltage cable junction box 7. The end of the elbow-type protective terminal block 8 outside the high-voltage cable junction box 7 is connected to the controllable high-voltage switch 5, and the end of the elbow-type protective terminal block 8 inside the high-voltage cable junction box 7 is connected to the high-voltage flexible cable. No disassembly is required after wiring. Furthermore, the high-voltage cable junction box 7 adopts an isolation and protection design, and the use of the elbow-type protective terminal block 8 on top of the high-voltage cable junction box 7 reduces the installation size.

[0023] The insulating plate 9 has wire holes, which are three-phase holes (A, B, C) for passing through high-voltage flexible cables and leading them to the cable winding reel protective box 10.

[0024] The cable winding reel 11 is installed inside the cable winding reel protective box 10. The high-voltage flexible cable is vertically led to the cable winding reel 11 through the wire-passing hole, thereby avoiding the large stress caused by the small radius when the high-voltage flexible cable is connected. The cable winding reel protective box 10 is equipped with a box door for leading out the high-voltage flexible cable. When wiring, the box door of the cable winding reel protective box 10 is opened to load and unload the high-voltage flexible cable.

[0025] The secondary sides of the controllable high-voltage switch 5 and tap changer 6 are connected to a flexible control device 12, which is housed in a flexible control device box. The flexible control device 12 supports flexible control of remote and local opening and closing, enabling the current generating device 1 to be connected and disconnected. The secondary wiring between the secondary sides of the controllable high-voltage switch 5 and tap changer 6 and the flexible control device 12 is accurately and reliably connected using quick-connect plugs. The flexible control device 12 is also wirelessly connected to a handheld mobile terminal 13, allowing operators to conveniently control the device.

[0026] In use, this utility model involves releasing the cable through the cable winding reel 11 and connecting it energized to the overhead power distribution line. The current generating device 1 is then connected to the power grid system via remote or local control of the controllable high-voltage switch 5 and the tap changer 6. Furthermore, by controlling the tap changer 6 and the controllable high-voltage switch 5, the de-icing current can be flexibly adjusted, enabling de-icing operations on two different lengths of distribution lines. The current generating device 1 and the isolation protection box 4 are organically combined using an integrated flange sleeve 2, achieving a compact design and avoiding oil leakage. This effectively isolates the high-voltage live parts from the outside environment, ensuring personal safety. The high-voltage flexible cable uses an elbow-type connection method to ensure high-voltage protection safety and achieves a miniaturized design for the isolation protection box 4. The flexible cable is stored in the cable winding reel 11 inside the cable winding reel protection box 10, reducing disassembly and wiring and avoiding damage to the cable. The tap changer 6 and the controllable high-voltage switch 5 are connected to the flexible control device 12 via quick-connect plugs, enabling rapid wiring and improving the accuracy and reliability of wiring. The remote and local control of the flexible control device 12 allows for flexible deployment and deactivation of the current generating device 1.

Claims

1. A controllable current generating device for de-icing of 10kV medium-voltage distribution network lines, characterized in that: The device includes an isolation and protection box (4) and a current generating device (1) for AC output. The side of the current generating device (1) is provided with an integrated flange sleeve (2) that passes through the isolation and protection box (4) and is sealed to the isolation and protection box (4). The inside of the integrated flange sleeve (2) is provided with a conductive rod. The current generating device (1) is provided with two sets of taps. The inside of the isolation and protection box (4) is provided with two sets of disconnect switches (6) for current regulation and a set of controllable high-voltage switches (5). The two sets of taps are connected to the input ends of the two sets of disconnect switches (6) respectively through the conductive rod of the integrated flange sleeve (2). The output ends of the two sets of disconnect switches (6) are connected to the input ends of the controllable high-voltage switches (5). The high-voltage side of the controllable high-voltage switches (5) is connected to a high-voltage flexible cable for splicing to an overhead power distribution line through an elbow-type protective terminal (8). The inside of the isolation and protection box (4) is also provided with a cable winding reel (11) for winding the high-voltage flexible cable.

2. The controllable current generating device for de-icing of 10kV medium-voltage distribution network lines according to claim 1, characterized in that: The integrated flange sleeve (2) is a dry high-pressure sleeve that can avoid oil leakage and seepage along the conductive rod caused by horizontal movement. The end of the integrated flange sleeve (2) away from the current generating equipment (1) is fixed inside the isolation protection box (4) through the installation hole opened on the isolation protection box (4) and the flange reinforcing bolt (3).

3. A controllable current generating device for de-icing 10kV medium-voltage distribution network lines according to claim 1, characterized in that: The isolation and protection box (4) has a side chamber on one side, which is divided into a high-voltage cable junction box (7) and a cable winding reel protection box (10) by a horizontally arranged insulating plate (9). The elbow-type protective terminal (8) is installed on the upper part of the high-voltage cable junction box (7). The elbow-type protective terminal (8) is connected to the controllable high-voltage switch (5) at one end outside the high-voltage cable junction box (7), and connected to the high-voltage flexible cable at the other end inside the high-voltage cable junction box (7). The insulating plate (9) has a through hole for the high-voltage flexible cable to pass through. The cable winding reel (11) is installed inside the cable winding reel protection box (10), and the high-voltage flexible cable is vertically led to the cable winding reel (11) through the through hole.

4. A controllable current generating device for de-icing 10kV medium-voltage distribution network lines according to claim 3, characterized in that: The cable winding reel protective box (10) is equipped with a door for leading out high-voltage flexible cables.

5. A controllable current generating device for de-icing of 10kV medium-voltage distribution network lines according to claim 1, characterized in that: The secondary side of the controllable high voltage switch (5) and tap changer (6) is connected to a flexible control device (12) for supporting flexible remote and local control, and the secondary wires between the secondary side of the controllable high voltage switch (5) and tap changer (6) and the flexible control device (12) are connected and fixed by quick-connect plugs.

6. A controllable current generating device for de-icing of 10kV medium-voltage distribution network lines according to claim 5, characterized in that: The isolation and protection box (4) is equipped with a flexible control device box, and the flexible control device (12) is installed in the flexible control device box. The flexible control device (12) is wirelessly connected to a handheld mobile terminal (13).

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