Extra-high voltage reactor equivalent scaling model

Abstract

The utility model belongs to the field of electric reactors, and relates to an equivalent scaling model of an extra-high voltage electric reactor, which combines a direct wire outlet structure with an equivalent scaling indirect wire outlet structure, and the equivalent scaling indirect wire outlet structure is consistent with an indirect wire outlet structure of the extra-high voltage electric reactor. The equivalent scaling indirect outgoing line structure and the indirect outgoing line structure of the extra-high voltage reactor are equivalent in the aspects of electric field intensity, safety margin and mechanical strength, the equivalent scaling indirect outgoing line structure is reduced in proportion, and an online monitoring interface and a sensor are arranged on the equivalent scaling model; the equivalent scaling indirect outgoing line structure comprises an L-shaped equivalent scaling indirect outgoing line ascending flanged base and an equivalent scaling outgoing line device, the equivalent scaling indirect outgoing line ascending flanged base is fixedly installed on the side wall of the reactor oil tank, and the equivalent scaling outgoing line device is fixedly installed in the equivalent scaling indirect outgoing line ascending flanged base. According to the utility model, on the premise of reducing the voltage class and fault energy, the fault verification of discharge, heating, burning explosion and the like is realized, and the effectiveness of the sensor and the installation position is verified.

Description

Technical Field

[0001] This utility model belongs to the field of reactor technology, specifically relating to an equivalent scaled-down model of an ultra-high voltage reactor. Background Technology

[0002] In modern power systems, ultra-high voltage (UHV) transmission technology is crucial for achieving large-capacity, long-distance power transmission. UHV reactors, as key equipment in UHV transmission systems, play a vital role in limiting short-circuit currents and compensating for capacitive reactive power; their performance directly affects the safe and stable operation of the entire transmission system.

[0003] Due to the complex structure, large size, and high cost of ultra-high voltage reactors, directly conducting various performance tests and studies on them is not only extremely costly but also presents numerous difficulties in practical operation. Currently, conventional theoretical analysis and numerical simulations are insufficient to fully and accurately reflect their complex electromagnetic characteristics and physical phenomena during actual operation, and cannot provide strong technical support for the optimized design, operation and maintenance, and fault diagnosis of ultra-high voltage reactors.

[0004] In order to further study the fault resistance mechanism of UHV reactors and assist in the fault cause analysis of UHV reactors, it is necessary to design an equivalent scaled-down model of UHV reactors. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides an equivalent scaled-down model of an ultra-high voltage reactor. The technical solution adopted by this utility model is as follows:

[0006] An equivalent scaled-down model of an ultra-high voltage (UHV) reactor employs an external structure combining a direct outgoing line structure and an equivalent scaled-down indirect outgoing line structure. The equivalent scaled-down indirect outgoing line structure is identical to the indirect outgoing line structure of the UHV reactor and is equivalent to it in terms of electric field strength, safety margin, and mechanical strength. The equivalent scaled-down indirect outgoing line structure is proportionally reduced. The equivalent scaled-down model is equipped with several online monitoring interfaces and several sensors. The equivalent scaled-down indirect outgoing line structure includes an L-shaped equivalent scaled-down indirect outgoing line riser and an equivalent scaled-down outgoing line device. The equivalent scaled-down indirect outgoing line riser is fixedly installed on the side wall of the reactor tank, and the equivalent scaled-down outgoing line device is fixedly installed within the equivalent scaled-down indirect outgoing line riser.

[0007] Preferably, an auxiliary raising seat is fixedly installed above the equivalent scaled indirect output raising seat, and an indirect output sleeve is fixedly installed above the auxiliary raising seat. The equivalent scaled output device is a molded part, and the inside of the equivalent scaled output device consists of interconnected aluminum tubes and an equivalent scaled equalizing ball. The equivalent scaled equalizing ball is located at the upper part of the equivalent scaled output device, and an insulating part is wrapped around the outside of the equivalent scaled equalizing ball.

[0008] Preferably, the direct-outlet structure includes a direct-outlet riser fixedly installed on one side of the reactor tank cover, a current transformer installed inside the direct-outlet riser, a metal support plate fixedly installed at the lower end of the direct-outlet riser, a bushing equalizing ball placed on the metal support plate, the tail end of the direct-outlet bushing connected to the bushing equalizing ball, and an insulating cardboard tube installed on the outer periphery of the bushing equalizing ball.

[0009] Preferably, the tail end of the indirect outlet bushing is inserted into the equivalent scaling equalizing ball, and the equivalent scaling outlet device, the equivalent scaling equalizing ball and the indirect outlet bushing are connected by an equipotential line; the equalizing ball and the equivalent scaling outlet device are connected by a lead wire, the lead wire is supported and fixed by a lead wire support, and an angle ring is fixedly installed on the inner wall of the reactor oil tank on the indirect outlet side of the oil tank.

[0010] Preferably, the online monitoring interface includes an oil chromatography online monitoring interface and a single hydrogen online monitoring interface. The oil chromatography online monitoring interface is located on the tank wall of the reactor oil tank and on the seat wall of the equivalent scaled-down indirect outlet riser. The single hydrogen online monitoring interface is located on the seat wall of the equivalent scaled-down indirect outlet riser.

[0011] Preferably, the online oil chromatography monitoring interface and the online single hydrogen monitoring interface include a pipe connector and a ball valve.

[0012] Preferably, the equivalent scaled-down indirect cable raising seat has an equivalent scaled-down indirect cable raising seat hand hole on its seat wall, and the auxiliary raising seat has an auxiliary raising seat hand hole on its seat wall.

[0013] Preferably, the sensor includes an external ultrasonic partial discharge monitoring sensor, an external high-frequency partial discharge monitoring sensor, and a built-in optoelectronic integrated partial discharge monitoring sensor.

[0014] Preferably, an external ultrasonic partial discharge monitoring sensor is fixedly installed at the upper and lower positions of the outer periphery of the equivalent scaled indirect output riser, an external high-frequency partial discharge monitoring sensor is fixedly installed at the upper and lower external crossover points of the auxiliary riser, four built-in photoelectric integrated partial discharge monitoring sensors are evenly distributed on the four side walls of the reactor tank, and one built-in photoelectric integrated partial discharge monitoring sensor is installed on the cover plate of the hand hole of the auxiliary riser and the cover plate of the hand hole of the equivalent scaled indirect output riser.

[0015] Preferably, the reactor tank has a barrel-type structure, and the direct output side wall of the reactor tank has a semi-cylindrical boss structure, with a manhole provided at the bottom of the boss structure.

[0016] The beneficial effects of this utility model are:

[0017] This invention presents a pioneering equivalent scaled-down model of an ultra-high voltage reactor. Under the premise of reducing voltage levels and fault energy, it utilizes this model to verify faults such as discharge, heating, and deflagration. Simultaneously, by installing various sensors within the equivalent scaled-down model, the changes in monitoring signals during the fault initiation, development, and deflagration process are recorded, verifying the effectiveness of the sensors and their installation locations. This provides a reference for the subsequent deployment of monitoring devices for ultra-high voltage equipment. The equivalent scaled-down model features a reasonable structural design and offers high-performance, cost-effective testing value. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a front view of the external structure of the equivalent scaled-down model of this utility model embodiment;

[0020] Figure 2 This is a left view of the external structure of the equivalent scaled-down model of this utility model embodiment;

[0021] Figure 3 This is a top view of the external structure of the equivalent scaled-down model of this utility model embodiment;

[0022] Figure 4 This is a schematic diagram of the internal structure of the equivalent scaled-down model of this utility model embodiment;

[0023] Among them, 1. Direct outlet bushing, 2. Indirect outlet bushing, 3. Reactor oil tank, 4. Direct outlet riser, 5. Equivalent scaled-down indirect outlet riser, 6. Auxiliary riser, 7. Equivalent scaled-down outlet device, 8. Equivalent scaled-down equalizing ball, 9. Equipotential line, 10. Lead wire, 11. Bushing equalizing ball, 12. Insulating cardboard tube, 13. Lead wire support, 14. Oil chromatography online monitoring interface, 15. Current transformer, 16. Angle ring, 17. Manhole, 18. Auxiliary riser handhole, 19. Equivalent scaled-down indirect outlet riser handhole, 20. Slotted reinforcing iron, 21. Plate reinforcing iron, 22. Oil tank, 23. External ultrasonic partial discharge monitoring sensor, 24. External high-frequency partial discharge monitoring sensor, 25. Built-in photoelectric integrated partial discharge monitoring sensor, 26. Single hydrogen online monitoring interface. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] In this embodiment of the present invention, "direct lead-out" refers to the winding lead-out being directly led out through the bushing, while "indirect lead-out" refers to the winding lead-out first passing through a lead-out device and then being led out through the bushing.

[0026] By comparing outgoing line devices at different voltage levels, it can be found that the higher the voltage level, the easier it is to achieve structural consistency and equivalence. UHV reactor bushings typically adopt the ABB standard GOE structure. In terms of structure and principle, the bushings for the 500 kV and 1000 kV levels are similar. Therefore, the UHV reactor equivalent scaled-down model of this utility model embodiment is designed based on a 500 kV voltage level, and all bushings adopt the 500 kV ABB-GOE structure.

[0027] like Figure 1-4 ( Figure 4 As shown in the figure (excluding the oil conservator 22), an equivalent scaled-down model of an ultra-high voltage reactor includes a reactor oil tank 3, a riser base, an oil conservator 22, a bushing, an outgoing line device, a current transformer (CT) 15, an angle ring 16, a lead wire 10, and a lead wire support 13, etc.

[0028] The reactor tank 3 has a barrel-type structure. The direct-outlet side wall of the reactor tank 3 is a semi-cylindrical boss structure. A manhole 17 is provided at the bottom of the boss structure, allowing operators to easily enter the interior of the reactor tank 3. To enhance the mechanical strength of the reactor tank 3, compared to the conventional 500 kV tank structure, multiple plate-type reinforcing irons 21 are designed at the boss structure of the reactor tank 3 wall, and multiple slotted reinforcing irons 20 are added to the outer periphery of the remaining side walls of the reactor tank 3. The oil conservator 22 is fixedly installed on the upper front side of the reactor tank 3 and is connected to the reactor tank 3.

[0029] The direct-outlet riser 4 is fixedly installed on one side of the reactor tank 3 cover via flange connectors. The direct-outlet bushing 1 is fixedly installed on the direct-outlet riser 4 via flange connectors. An opening is made in the side wall of the reactor tank 3 away from the direct-outlet riser 4, and an L-shaped equivalent scaled-down indirect-outlet riser 5 is fixedly installed via flange connectors. An auxiliary riser 6 is fixedly installed above the equivalent scaled-down indirect-outlet riser 5 via flange connectors, and the indirect-outlet bushing 2 is fixedly installed above the auxiliary riser 6 via flange connectors.

[0030] The upper side wall of the equivalent scaled-down indirect output riser 5 is also equipped with a single hydrogen online monitoring interface 26. This interface 26 is used to connect a single hydrogen monitoring device. It is equipped with a pipe connector and a ball valve. By extracting transformer oil from the equivalent scaled-down reactor model, the hydrogen content in the oil is monitored online using the single hydrogen monitoring device. An external ultrasonic partial discharge monitoring sensor 23 is fixedly installed at the upper and lower outer periphery of the equivalent scaled-down indirect output riser 5. The equivalent scaled-down indirect output riser 5 is also equipped with a manhole 19. An external high-frequency partial discharge monitoring sensor 24 is fixedly installed at the upper and lower external crossover points of the auxiliary riser 6. The auxiliary riser 6 is also equipped with a manhole 18. The external high-frequency partial discharge monitoring sensor 24 monitors high-frequency signals to detect whether there is a discharge signal inside the equivalent scaled-down model in real time. An external ultrasonic partial discharge monitoring sensor 23 is used to monitor the ultrasonic signal, with a focus on monitoring whether there is partial discharge inside the equivalent scaled-down indirect lead-out riser 5.

[0031] An online oil chromatography monitoring interface 14 is reserved on the tank wall of the reactor oil tank 3 and the wall of the equivalent scale indirect outlet riser 5. The online oil chromatography monitoring interface 14 is equipped with a pipe joint and a ball valve to enable the connection of the oil chromatography monitoring equipment. By extracting the transformer oil inside the equivalent scale model of the reactor, the oil chromatography monitoring equipment is used to monitor the content of methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, hydrogen and trace water in the transformer oil online.

[0032] Four built-in photoelectric integrated partial discharge monitoring sensors 25 are evenly distributed on the four side walls of the reactor tank 3. One built-in photoelectric integrated partial discharge monitoring sensor 25 is also installed on the cover plate of the auxiliary riser manhole 18 and the cover plate of the equivalent scale indirect outgoing line riser manhole 19 (a total of six). The built-in photoelectric integrated partial discharge monitoring sensors 25 are used to monitor in real time whether there is a discharge signal inside the equivalent scale model.

[0033] A current transformer 15 is installed inside the direct-outlet riser 4 to monitor the current change of the direct-outlet bushing 1. A bushing equalization ball 11 is installed at the tail of the direct-outlet bushing 1. An insulating cardboard tube 12 is installed around the outer periphery of the bushing equalization ball 11 for protection to meet the electrical insulation distance requirements. The insulating cardboard tube 12 is composed of multiple layers of insulating cardboard tubes. The insulating cardboard tube 12 is fixedly connected to the laminated wood insulating support plate and suspended inside the reactor tank 3. A metal support plate is fixedly installed inside the direct-outlet riser 4 to support the current transformer 15 inside. A fixing plate is welded to the lower part of the metal support plate. The upper part of the laminated wood insulating support plate is fixedly connected to the fixing plate, and the lower part of the laminated wood insulating support plate is fixedly connected to the cardboard tube 12. An equivalent-scaled outgoing line device 7 is installed inside the equivalent-scaled indirect outgoing line riser 5. An equivalent-scaled equalizing ball 8 is set inside the equivalent-scaled outgoing line device 7. The tail of the indirect outgoing line bushing 2 is inserted into the equivalent-scaled equalizing ball 8. The equivalent-scaled outgoing line device 7, the equivalent-scaled equalizing ball 8 and the indirect outgoing line bushing 2 need to be connected by an equipotential line 9. After the direct outgoing line bushing 1 and the indirect outgoing line bushing 2 are installed, the equalizing balls 11 on both sides of the bushing are connected to the equivalent-scaled outgoing line device 7 through the lead wire 10. The lead wire 10 is supported and fixed inside the reactor tank 3 by the lead wire support member 13. The lead wire support member 13 is used to prevent the lead wire 10 from sagging. An angle ring 16 is installed on the inner wall of the reactor tank 3 on the indirect outgoing line side of the tank. The angle ring 16 is used to increase the electric field safety margin. The angle ring 16 is fixedly installed on the inner wall of the tank by insulating bolts and insulating nuts.

[0034] The section of the lead wire 10 inside the equivalent scaled-out output device 7 uses copper braided tape and requires no insulation wrapping. The portion of the lead wire 10 inside the reactor tank 3 uses copper stranded wire and needs to be wrapped with insulating paper. The corner ring 16 is an insulating molded part, installed at the connection between the inner wall of the reactor tank 3 and the inner wall of the equivalent scaled-out indirect output riser 5. Since the reactor tank 3 on the indirect output side forms a metal sharp corner on the inner wall after the opening, a three-layer corner ring 16 is provided to meet the electric field safety margin at this location.

[0035] The equivalent scaling output device 7 is a molded part. The equivalent scaling output device 7 is fixed inside the equivalent scaling indirect output riser 5. The innermost part of the equivalent scaling output device 7 is an aluminum tube and an equivalent scaling equalizing ball 8. The outer side is wrapped with multiple layers of insulating parts. The aluminum tube and the equivalent scaling equalizing ball 8 are bolted together. One end of the equipotential line 9 is connected inside the equivalent scaling equalizing ball 8, and the other end of the equipotential line 9 is connected to the indirect output sleeve 2. The equivalent scaled-down outgoing line device 7 is equivalent to the outgoing line device of the UHV reactor product (725mm / 1500mm, which refers to the ratio of the inner diameter of the indirect outgoing line riser of the UHV reactor to the inner diameter of the equivalent scaled-down indirect outgoing line riser 5. When the equivalent scaled-down indirect outgoing line riser 5 has an inner diameter of 725mm, the electric field strength and safety margin are closest to those of the original UHV reactor). The insulation paper thickness and oil gap size of the equivalent scaled-down outgoing line device 7 are finely adjusted until the safety margin and electric field strength are basically consistent with the outgoing line device of the UHV reactor product.

[0036] Both the direct-outlet bushing 1 and the indirect-outlet bushing 2 are 500 kV ABB-GOE structure bushings.

[0037] This utility model embodiment, for the first time, presents an equivalent scaled-down version of the L-shaped outgoing line device and riser of an ultra-high voltage (1000kV) reactor. Various monitoring devices are installed to monitor the internal condition of the equivalent scaled-down model in real time. The principle of equivalence is based on scaling down the dimensions of the riser and outgoing line device to achieve equivalence in three aspects: electric field strength, safety margin, and mechanical strength. Based on design experience, a typical riser inner diameter is selected, and the dimensions of the equivalent scaled-down outgoing line device 7 are proportionally reduced. Electric field simulation calculations are performed, and the inner diameter and dimensions of the equivalent scaled-down outgoing line device 7 are adjusted synchronously based on the simulation results until the safety margin and electric field strength are close to those of 1000kV. After determining the inner diameter of the equivalent scaled-down indirect outgoing line riser 5, the insulation paper thickness and oil gap size of the equivalent scaled-down outgoing line device 7 are fine-tuned based on the electric field calculation results until the safety margin and electric field strength are essentially consistent with those of 1000kV.

[0038] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0039] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. An equivalent scaled-down model of an ultra-high voltage reactor, characterized by an external structure combining a direct-outgoing line structure and an equivalent scaled-down indirect-outgoing line structure, wherein... The equivalent scaled-down indirect output structure is consistent with the indirect output structure of the UHV reactor, and the equivalent scaled-down indirect output structure is equivalent to the indirect output structure of the UHV reactor in terms of electric field strength, safety margin and mechanical strength. The equivalent scaled-down indirect output structure is scaled down proportionally. The equivalent scaled-down model is equipped with several online monitoring interfaces and several sensors. The equivalent scaled-down indirect output structure includes an L-shaped equivalent scaled-down indirect output riser (5) and an equivalent scaled-down output device (7). The equivalent scaled-down indirect output riser (5) is fixedly installed on the side wall of the reactor oil tank (3), and the equivalent scaled-down output device (7) is fixedly installed in the equivalent scaled-down indirect output riser (5).

2. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 1, characterized in that, An auxiliary riser (6) is fixedly installed above the equivalent scaled indirect line riser (5), and an indirect line sleeve (2) is fixedly installed above the auxiliary riser (6). The equivalent scaled line device (7) is a molded part. Inside the equivalent scaled line device (7) are interconnected aluminum tubes and an equivalent scaled equalizing ball (8). The equivalent scaled equalizing ball (8) is located on the upper part of the equivalent scaled line device (7), and the outside of the equivalent scaled equalizing ball (8) is wrapped with an insulating part.

3. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 2, characterized in that, The direct line structure includes a direct line riser (4) fixedly installed on one side of the upper cover of the reactor oil tank (3). A current transformer (15) is installed inside the direct line riser (4). A metal support plate is fixedly installed at the lower end of the direct line riser (4). A bushing equalizing ball (11) is placed on the metal support plate. The tail of the direct line bushing (1) is connected to the bushing equalizing ball (11). An insulating paper tube (12) is installed on the outer periphery of the bushing equalizing ball (11).

4. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 3, characterized in that, The tail of the indirect outlet bushing (2) is inserted into the equivalent scaling equalizing ball (8). The equivalent scaling outlet device (7), the equivalent scaling equalizing ball (8) and the indirect outlet bushing (2) are connected by the equipotential line (9). The bushing equalizing ball (11) is connected to the equivalent scaling outlet device (7) by the lead wire (10). The lead wire (10) is supported and fixed by the lead wire support (13). An angle ring (16) is fixedly installed on the inner wall of the indirect outlet side of the reactor oil tank (3).

5. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 2, characterized in that, The online monitoring interface includes an oil chromatography online monitoring interface (14) and a single hydrogen online monitoring interface (26). The oil chromatography online monitoring interface (14) is located on the tank wall of the reactor oil tank (3) and on the seat wall of the equivalent scaled indirect output riser (5). The single hydrogen online monitoring interface (26) is located on the seat wall of the equivalent scaled indirect output riser (5).

6. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 5, characterized in that, The oil chromatography online monitoring interface (14) and the single hydrogen online monitoring interface (26) include pipe fittings and ball valves.

7. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 2, characterized in that, The equivalent scaled-down indirect cable raising seat (5) has an equivalent scaled-down indirect cable raising seat hand hole (19) on its seat wall, and the auxiliary raising seat (6) has an auxiliary raising seat hand hole (18) on its seat wall.

8. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 7, characterized in that, The sensors include an external ultrasonic partial discharge monitoring sensor (23), an external high-frequency partial discharge monitoring sensor (24), and a built-in optoelectronic integrated partial discharge monitoring sensor (25).

9. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 8, characterized in that, An external ultrasonic partial discharge monitoring sensor (23) is fixedly installed at the upper and lower positions of the outer periphery of the equivalent scaled indirect output riser (5). An external high frequency partial discharge monitoring sensor (24) is fixedly installed at the upper and lower cross-connection points of the auxiliary riser (6). Four built-in photoelectric integrated partial discharge monitoring sensors (25) are evenly distributed on the four side walls of the reactor tank (3). A built-in photoelectric integrated partial discharge monitoring sensor (25) is installed on the cover plate of the auxiliary riser hand hole (18) and the cover plate of the equivalent scaled indirect output riser hand hole (19).

10. The equivalent scaled-down model of an ultra-high voltage reactor according to claim 1, characterized in that, The reactor oil tank (3) has a barrel-type structure. The direct output side wall of the reactor oil tank (3) is a semi-cylindrical boss structure, and a manhole (17) is provided at the bottom of the boss structure.

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