Novel high-capacity electric energy transmission bus system

Abstract

The utility model discloses a novel high-capacity electric energy transmission bus system, belongs to the technical field of high-voltage solid insulation power transmission lines, and adopts solid insulation to replace gas insulation to solve the problems that gas insulation is poor in safety, high in operation cost, not environmentally friendly and the like. The cable comprises a plurality of current carriers, and the current carriers are insulated and shielded through an insulation assembly. At least one end of the insulation assembly is located at the ground potential, the conditions of gas leakage, insulation reduction and the like can be avoided in the mode, meanwhile, the electric field of related parts can be better homogenized, and the actual use requirement is met.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-voltage solid-insulated transmission lines, specifically relating to a novel large-capacity power transmission bus system. Background Technology

[0002] There is currently a strong demand for busbars used in power transmission. However, the busbars used are still traditional products, such as isolated-phase enclosed busbars with voltage levels of 15~35kV and gas-insulated metal-enclosed transmission lines (GIL) with voltage levels of 72.5~1100kV. Both types of busbars use insulators for support. Isolated-phase enclosed busbars need to prevent condensation, while GIL needs to prevent gas leakage, both requiring extremely high airtightness of the casing. In particular, GIL uses SF6 as the main insulating gas, which requires extremely high gas purity. If dust, impurities, or other conductive ions are mixed into the GIL during equipment manufacturing and installation, it can cause line discharge or even short circuits. This type of GIL busbar has stringent manufacturing requirements, is expensive, and requires real-time monitoring of gas leakage and regular maintenance. SF6, as the insulating medium, is a greenhouse gas, and there are currently clear restrictions and reduction targets for greenhouse gas emissions.

[0003] Currently, solid insulation is rarely used in transmission lines with voltage levels of 72.5-1100kV; gas insulation is typically employed. However, gas insulation has limitations such as the risk of gas leakage, its lack of environmental friendliness, and the potential for gas liquefaction and decreased insulation strength under extreme low-temperature environments. Therefore, a new type of high-capacity power transmission bus system is needed to replace GIL (Gas Insulation Line) to address the shortcomings of existing technologies and meet the demands for safer, more reliable, and environmentally friendly transmission lines. Utility Model Content

[0004] The purpose of this invention is to provide a novel high-capacity power transmission bus system to solve the problems mentioned in the background art.

[0005] A novel high-capacity power transmission bus system includes several current carriers, which are insulated and shielded by insulating components; at least one end of each insulating component is at ground potential.

[0006] Furthermore, the insulating component includes several outer insulating shielding cylinders, each outer insulating shielding cylinder having a first capacitive insulator, and the first capacitive insulator having several capacitive screens inside.

[0007] Furthermore, when the end of the fluid-carrying device is connected using the first connection method, the first end of the outer insulating shield is at a high potential, and the second end of the outer insulating shield is at a ground potential.

[0008] When the end of the fluid-carrying device is connected using the second connection method, both the first and second ends of the outer insulating shield are at ground potential.

[0009] Furthermore, when the end of the fluid-carrying device is connected using the first connection method, the length of a plurality of capacitor screens in the first capacitor-type insulator at the first end of the outer insulating shield cylinder is successively shortened from the inside to the outside in the radial direction, and the length of a plurality of capacitor screens in the first capacitor-type insulator at the second end of the outer insulating shield cylinder is successively increased from the inside to the outside in the radial direction.

[0010] When the end of the fluid-carrying device is connected using the second connection method, the lengths of several capacitor screens in the first capacitor-type insulator at the first and second ends of the outer insulating shielding cylinder all increase sequentially from the inside to the outside in the radial direction.

[0011] Furthermore, the insulating assembly also includes an insulating sleeve, with the end of the fluid-carrying part sleeved inside the insulating sleeve, and the outer insulating shield sleeved outside the insulating sleeve.

[0012] Furthermore, the insulating sleeve is provided with a second capacitor-type insulator, and the second capacitor-type insulator is provided with a plurality of capacitor screens, the length of the plurality of capacitor screens decreasing sequentially from the inside to the outside in the radial direction.

[0013] Furthermore, the current-carrying fluid includes several conductors, each conductor having terminals at both ends. The terminals of the conductors with their ends close to each other are connected to each other through a flexible or rigid connection.

[0014] Furthermore, the current-carrying component includes a plurality of conductors, each conductor having terminals at both ends, and the first terminals of the conductors with their ends close to each other are fitted inside an insulating sleeve, the insulating assembly including the insulating sleeve.

[0015] Furthermore, the current-carrying component includes several conductors, each conductor having terminals at both ends. A second terminal of the conductor near the end of the outer insulating shield extends through the outer insulating shield, and the insulating assembly includes the outer insulating shield.

[0016] Furthermore, at least two external insulating shielding cylinders are provided.

[0017] Furthermore, an expansion joint is provided between two adjacent outer insulating shielding cylinders.

[0018] Compared with the prior art, the novel high-capacity power transmission bus system provided by this utility model has at least the following beneficial effects:

[0019] (1) The external insulation of the new high-capacity power transmission bus system of this utility model is all connected into one body by external insulation shielding cylinders. The flange at the end of the external insulation shielding cylinder achieves normal pressure sealing through the first sealing ring, which is more reliable than the sealing of several atmospheres of GIL. The expansion joint can effectively solve the problems of thermal expansion and contraction and vibration of the system. After the external insulation shielding cylinders are connected into one body, they are grounded through the end flange. The entire outer surface of the external insulation shielding cylinder is at ground potential, which is highly safe. The corresponding parts of the internal cavity of the external insulation shielding cylinder and the expansion joint are provided with a first insulating sleeve and a second insulating sleeve. The capacitor-type insulators of the first insulating sleeve and the second insulating sleeve are provided with capacitor screens that match the capacitor-type insulators of the external insulation shielding cylinder. The two capacitor screens are electrically connected, thereby better homogenizing the electric field of the relevant parts and meeting the actual use requirements.

[0020] (2) Compared with traditional metal phase busbars and GILs, this utility model has higher reliability, simple structure, low cost, no oil or gas, green and environmentally friendly, and outstanding cost performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall disassembled structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the second equalizing ring structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the first sealing ring structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the first equalizing ring structure of this utility model. Attached image description:

[0027] 100. External insulating shielding cylinder; 101. End flange; 102. First sealing ring; 103. First equipotential line;

[0028] 200. Expansion joint; 201. Connecting flange;

[0029] 300, Conductor; 301, First terminal; 302, First conductor; 303, Second conductor; 304, Third conductor;

[0030] 400. First insulating sleeve; 401. First fixed flange; 402. Second equipotential line;

[0031] 500, First soft connection; 501, Second soft connection;

[0032] 600, Second terminal block; 601, Conductive contact finger;

[0033] 700. Second insulating sleeve; 701. Second fixed flange; 702. Third equipotential line;

[0034] 800. Second sealing ring; 801. First equalizing ring;

[0035] 900. Second equalizing ring; 901. Sealing flange;

[0036] 1000, First bolt; 1001, Second bolt; 1002, Nut; 1003, Third bolt; 1004, Fourth bolt. Detailed Implementation

[0037] The technical solution of the novel large-capacity power transmission bus system of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model.

[0038] Example 1

[0039] Existing GIL products may experience convection of the insulating gas SF6 under high voltage conditions within a temperature gradient field, leading to discrepancies between the insulation margin along the insulator surface and the design, threatening the safe operation of the equipment. Simultaneously, in extreme low-temperature environments, the insulating gas used in GIL may liquefy, resulting in a decrease in insulation strength and posing electrical hazards. Furthermore, to ensure line safety, special gas detection devices must be installed to detect gas leaks and prevent explosions, significantly increasing operating costs.

[0040] To ensure the safe operation of the equipment, this utility model provides a novel large-capacity power transmission bus system. Please refer to [link / reference]. Figures 1-5 The system includes several current-carrying components, which are insulated and shielded by an insulating component. At least one end of the insulating component is at ground potential. The current-carrying components may be composed of several conductors 300, each with a terminal at both ends. In this embodiment, three conductors 300 are used: a first conductor 302, a second conductor 303, and a third conductor 304. The conductors 300 are preferably made of copper or aluminum. When a conductor 300 consists of at least two connections, the conductor 300 connections can be flexible or rigid, i.e., the conductors are electrically connected using flexible or rigid connection methods. Flexible connection methods include those made of braided wire, copper foil, or aluminum foil. Rigid connection methods include welding or bolting, etc., which are not limited here.

[0041] The insulation assembly includes several outer insulating shield cylinders 100 and insulating sleeves. The terminals at both ends of the conductor 300 pass through the outer insulating shield cylinders 100. When one end of the first conductor 302 is close to one end of the second conductor 303, and the end of the second conductor 303 away from the first conductor 302 is close to one end of the third conductor 304, the first insulating sleeve 400 is provided at both the end where the first conductor 302 and the second conductor 303 are close and the end where the second conductor 303 and the third conductor 304 are close. That is, the connection point of the conductor 300 is set in the cavity of the first insulating sleeve 400. The insulating sleeve includes the first insulating sleeve 400. At this time, the two ends of the first insulating sleeve 400 are respectively fitted inside the adjacent outer insulating shield cylinders 100, thereby realizing the electric field equalization and insulating shielding connection through the first insulating sleeve 400 and the outer insulating shield cylinders 100.

[0042] It should be noted that, due to the use of insulating components for insulation shielding, solid insulation is constituted. The solid insulation of this application avoids issues such as decreased insulation strength and gas leakage, thereby significantly reducing operating costs while ensuring the safe operation of the busbar. Simultaneously, solid insulation effectively prevents current from flowing through non-conductive paths under high-voltage environments, reducing energy loss and preventing leakage or breakdown, ensuring the safe operation of the busbar under high-voltage conditions and effectively avoiding equipment safety hazards caused by GIL gas insulation. Furthermore, because at least one end of the outer insulating shielding cylinder is at ground potential (zero potential), reliable shielding against high voltage is achieved, reducing the space occupied by the equipment. In addition, there are currently no precedents for the entire high-voltage and ultra-high-voltage transmission lines using solid insulation, both domestically and internationally, and this application fills this gap.

[0043] Specifically, at this time, the end of the first conductor 302 away from the second conductor 303 and the end of the third conductor 304 away from the second conductor 303 can both be configured as the same second terminal as the first terminal 301; or they can both be configured as contact grooves, in which conductive contacts 600 are provided, preferably beryllium copper plated with silver; or the first conductor 302 has a contact groove and conductive contacts 600 at the end away from the second conductor 303, and the third conductor 304 has a second terminal at the end away from the second conductor 303, or vice versa; wherein, the busbar configured in the manner where the end of the first conductor 302 away from the second conductor 303 and the end of the third conductor away from the second conductor are both configured as the same second terminal as the first terminal 301 is an open type; the busbar configured in the manner where the end of the first conductor 302 away from the second conductor 303 and the end of the third conductor 304 away from the second conductor 303 are both configured as conductive contacts 601 is a pluggable type. The first terminal 301 and the second terminal 600 are preferably made of copper or aluminum.

[0044] Specifically, when using the first connection method (i.e., open connection), the first end of the outer insulating shield 100 is at a high potential, and the second end of the outer insulating shield 100 is at ground potential; when using the second connection method (i.e., plug-in connection), both the first and second ends of the outer insulating shield 100 are at ground potential.

[0045] The first type is open type: when the busbar ends are connected in an open manner, one end of the outer insulating shield cylinder 100 is at a high potential and the other end is at a ground potential.

[0046] The second type is plug-in type: when the busbar ends are connected by a plug-in type, both ends of the outer insulating shield cylinder 100 are at ground potential.

[0047] In addition, when the busbar ends are connected by a plug-in type, at least one end of the outer insulating shield cylinder 100 is provided with a sealing basin-type insulator between the conductor 300 and the outer insulating shield cylinder 100, or an insulating outgoing sleeve is directly provided on the conductor 300 for plugging in with other electrical equipment; for example, a second insulating sleeve 700 is provided at the end of the first conductor away from the second conductor, that is, a part of the end of the conductor 300 is provided in the cavity of the second insulating sleeve 700.

[0048] In particular, when one end of the outer insulating shield cylinder 100 is at a high potential and the other end is at a ground potential, it is suitable for open connection with other electrical equipment.

[0049] When the two ends of the outer insulating shield cylinder 100 are at ground potential, it is suitable for plug-in connection with other electrical equipment.

[0050] In cases where at least two outer insulating shielding cylinders 100 are provided, an expansion joint 200 may preferably be provided between adjacent outer insulating shielding cylinders 100.

[0051] To achieve equipotentiality, the capacitor screen connection points inside the outer insulating shielding cylinder 100, the first insulating sleeve 400, and the second insulating sleeve 700 are respectively connected to a first equipotential line 103, a second equipotential line 402, and a third equipotential line 702, and the first equipotential line 103, the second equipotential line 402, and the third equipotential line 702 are respectively connected to the conductor 300.

[0052] To achieve better insulation and shielding effects, the outer insulating shielding cylinder 100 is provided with a first capacitive insulator, which contains several capacitor screens. The first insulating sleeve 400 and the second insulating sleeve 700 are both provided with a second capacitive insulator, which contains several capacitor screens. When one end of the outer insulating shield cylinder 100 is at a high potential and the other end is at ground potential, the length of several capacitor screens in the first capacitor-type insulator at the first end of the outer insulating shield cylinder 100 is preferably shortened sequentially from the inside to the outside in the radial direction according to an arithmetic sequence, where the radial direction refers to the direction perpendicular to the length of the outer insulating shield cylinder 100; the length of several capacitor screens in the first capacitor-type insulator at the second end of the outer insulating shield cylinder 100 is preferably increased sequentially from the inside to the outside in the radial direction according to an arithmetic sequence, and the outermost capacitor screen is connected to the end flange 101 at one end, and the end flange 101 is grounded; when both ends of the outer insulating shield cylinder 100 are at ground potential, the length of several capacitor screens in the first capacitor-type insulator at the first end and the second end of the outer insulating shield cylinder 100 is preferably increased sequentially from the inside to the outside in the radial direction according to an arithmetic sequence, and the outermost capacitor screen is connected to the end flanges 101 at both ends respectively, and the end flanges 101 are grounded.

[0053] Similarly, the capacitor screens in the second capacitor-type insulator of the first insulating sleeve 400 and the second insulating sleeve 700 are preferably shortened in an arithmetic sequence from the inside to the outside in the radial direction. The outermost capacitor screen is connected to the first fixed flange 401 and the second fixed flange 701 at the same potential. The first fixed flange 401 and the second fixed flange 701 are then connected to the end flange 101 of the outer insulating shield cylinder 100 at the same potential.

[0054] An equipotential cylinder or a first equipotential line 103 is provided inside the outer insulating shield cylinder 100. The innermost capacitor screen of the outer insulating shield cylinder 100 is equipotentially connected to the equipotential cylinder or the first equipotential line 103. A non-magnetic metal shell may be provided outside the outer insulating shield cylinder 100 as needed.

[0055] The first insulating sleeve 400 and the second insulating sleeve 700 are provided with an equipotential cylinder or a second equipotential line 402 and a third equipotential line 702. The innermost capacitor screen of the first insulating sleeve 400 and the second insulating sleeve 700 is equipotentially connected to the equipotential cylinder or the second equipotential line 402 and the third equipotential line 702.

[0056] Specifically, when conductor 300, first terminal 301, second terminal 600, first flexible connector 500, and second flexible connector 501 are in the cavity, the materials of the first flexible connector 500 and the second flexible connector 501 are preferably copper or aluminum. The end flange 101 of the outer insulating shielding cylinder 100 is equipotentially connected to the first fixed flange 401 of the first insulating sleeve 400 and the second fixed flange 701 of the second insulating sleeve 700.

[0057] Example 2

[0058] The difference from Embodiment 1 is that the conductor 300 end may be provided with an equalizing ball and a first terminal 301 as needed for connection.

[0059] Furthermore, the outer insulating shielding cylinder 100 is fixed with end flanges 101 at both ends, and a sealing groove is provided on one side of the end flange 101. A first sealing ring 102 is provided in the sealing groove. The expansion joint 200 is fixed with connecting flanges 201 at both ends. The connecting flanges 201 are preferably made of non-magnetic metal. The connecting flanges 201 and the end flanges 101 are equipotentially connected and are connected as one unit by a third bolt 1003 and a nut 1002.

[0060] A reliable seal between adjacent outer insulating shield cylinders 100 is achieved by the first sealing ring 102 set in the sealing groove. The expansion joint 200 is connected to the outer insulating shield cylinder 100 as a whole by the connecting flange 201, the second bolt 1001 and the nut 1002.

[0061] As a further embodiment of this utility model, a sealing flange 901 is provided at one end of the outer insulating shielding cylinder 100 away from the conductive contact finger 601. A second equalizing ring 900 is fixed to one side of the sealing flange 901. The second equalizing ring 900 and the sealing flange 901 are integrally formed. A first bolt 1000 is connected between the sealing flange 901 and the end flange 101 on this side. The outer wall of the conductor 300 on this side is fixed to the inner wall of the sealing flange 901. In particular, in the pluggable busbar, the end flange 101, the connecting flange 201 and the sealing flange 901 are all at ground potential.

[0062] The conductor 300 on this side can be fixed by the sealing flange 901, and the sealing flange 901 can be connected to the outer insulating shielding cylinder 100 on this side by the first bolt 1000.

[0063] As a further embodiment of this utility model, a first fixing flange 401 is fixed to the outer wall of the first insulating sleeve 400, and a second bolt 1001 is connected between the first fixing flange 401 and the corresponding end flange 101.

[0064] By using the second bolt 1001, the first insulating sleeve 400 can be connected to the outer insulating shield 100 through the first fixing flange 401 and the second bolt 1001, thus maintaining the stability of the first insulating sleeve 400 within the outer insulating shield 100.

[0065] As a further embodiment of this utility model, a second fixing flange 701 is fixed to the outer wall of the second insulating sleeve 700, and a fourth bolt 1004 is connected between the second fixing flange 701 and the end flange 101 on the same side.

[0066] The second fixed flange 701 and the fourth bolt 1004 enable the second insulating sleeve 700 to be stably connected to the outer insulating shield cylinder 100.

[0067] Example 3

[0068] The difference from Embodiment 2 is that a first equalizing ring 801 is fixed on the outer surface of the conductor 300 on the side away from the second equalizing ring 900, a second sealing ring 800 is fixed between the first equalizing ring 801 and the conductor 300 on the side away from the second equalizing ring, and one end of the second insulating sleeve 700 is located inside the first equalizing ring 801.

[0069] By setting the first equalizing ring 801 and the second sealing ring 800, a stable sealing state can be formed between the second insulating sleeve 700 and the conductor 300 on this side.

[0070] As a further embodiment of this utility model, a first flexible connection 500 is fixed between two adjacent first terminals 301, and a second flexible connection 501 is fixed between the second terminal 600 and its corresponding first terminal 301.

[0071] By setting the first soft connection 500 and the second soft connection 501, a connection can be formed between two adjacent conductors 300 while maintaining conductivity.

[0072] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel high capacity electrical power transmission busbar system characterized in that, The current-carrying fluid is insulated by an insulation assembly, and at least one end of the insulation assembly is at ground potential.

2. A novel high-capacity electrical energy transmission bus system according to claim 1, characterized in that: The insulation assembly comprises a plurality of outer insulation shielding cylinders (100) provided with first capacitive insulators, and a plurality of capacitive screens are arranged in the first capacitive insulators.

3. The novel high-capacity electric energy transmission bus system according to claim 2, characterized in that: When the end of the current-carrying fluid is connected by the first connection mode, the first end of the outer insulation shielding cylinder (100) is at high potential, and the second end of the outer insulation shielding cylinder (100) is at ground potential. When the end of the current-carrying fluid is connected by the second connection mode, the first end and the second end of the outer insulation shielding cylinder (100) are both at ground potential.

4. The novel high-capacity electric energy transmission bus system according to claim 2, characterized in that: When the end of the current-carrying fluid is connected by the first connection mode, the lengths of the plurality of capacitive screens in the first capacitive insulator of the first end of the outer insulation shielding cylinder (100) gradually decrease from the inside to the outside along the radial direction, and the lengths of the plurality of capacitive screens in the first capacitive insulator of the second end of the outer insulation shielding cylinder (100) gradually increase from the inside to the outside along the radial direction. When the end of the current-carrying fluid is connected by the second connection mode, the lengths of the plurality of capacitive screens in the first capacitive insulator of the first end and the second end of the outer insulation shielding cylinder (100) both gradually increase from the inside to the outside along the radial direction.

5. A novel high-capacity electrical energy transmission bus system according to claim 2, characterized in that: The insulation assembly further comprises an insulation sleeve, and the end of the current-carrying fluid is sleeved in the insulation sleeve, and the outer insulation shielding cylinder (100) is sleeved outside the insulation sleeve.

6. A novel high-capacity electrical energy transmission busbar system according to claim 5, characterized in that: The insulation sleeve is provided with a second capacitive insulator, and a plurality of capacitive screens are arranged in the second capacitive insulator, and the lengths of the plurality of capacitive screens gradually decrease from the inside to the outside along the radial direction.

7. A novel high capacity electrical energy transmission busbar system as claimed in claim 1, wherein: The current-carrying fluid comprises a plurality of conductors (300), and the two ends of the conductors (300) are provided with terminal connectors, and the terminal connectors of the conductors (300) close to each other are connected by a flexible or rigid connection mode to realize the electrical connection of the conductors.

8. A novel high capacity electrical energy transmission busbar system as claimed in claim 1, wherein: The current-carrying fluid comprises a plurality of conductors (300), and the two ends of the conductors (300) are provided with terminal connectors, and the first terminal connectors of the conductors (300) close to each other are sleeved in the insulation sleeve, and the insulation assembly comprises the insulation sleeve.

9. A novel high capacity electrical energy transmission busbar system as claimed in claim 1, wherein: The current-carrying fluid comprises a plurality of conductors (300), and the two ends of the conductors (300) are provided with terminal connectors, and the second terminal connectors of the conductors (300) close to the end of the outer insulation shielding cylinder (100) are sleeved out of the outer insulation shielding cylinder (100), and the insulation assembly comprises the outer insulation shielding cylinder (100).

10. A novel high capacity electrical energy transmission busbar system as claimed in claim 2, wherein: The outer insulation shielding cylinder (100) is provided with at least two.

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