A GIS lightning arrester

Abstract

The present invention relates to a GIS lightning arrester, comprising a tank body, a first flange, a second flange, a core assembly and an insulator, wherein the core assembly is installed in the tank body, the first flange and the second flange are respectively installed at two ends of the tank body, a bypass is provided on the side wall of the tank body, and the insulator is installed on the bypass; a first connecting conductor and a second connecting conductor are connected to the core assembly, the first connecting conductor is arranged in the bypass and connected to the insulator, the second connecting conductor is arranged close to the first flange and a first shielding cover is installed between the first flange; the core assembly adopts a multi-column resistor parallel structure, and each column resistor includes a plurality of resistors connected in series. During the normal operation of the GIS lightning arrester of the present invention, the system voltage is applied to the lightning arrester, and the charge rate of the lightning arrester can be controlled to 85%, thereby ensuring the safety of the long-term operation of the lightning arrester. When an overvoltage occurs in the system, the insulation of the electrical equipment is protected from being damaged by the number of resistors in series and parallel of the core assembly.

Description

Technical Field

[0001] The present invention relates to the technical field related to lightning arresters, and in particular to a GIS lightning arrester, and in particular to an offshore wind power DC GIS lightning arrester. Background Art

[0002] With the rapid development of the economy and society, the development of new energy has become an important part of my country's energy development strategy. As one of the future clean energy sources, offshore wind power has been increasingly valued by developed countries for its advantages of superior wind resources, environmental protection, land conservation, and large scale. Germany, Denmark, the United Kingdom and other countries have listed the construction of offshore wind farms as the focus of future large-scale wind power development. my country has a long coastline and rich offshore wind energy resources. At the same time, the coastal areas have a developed economy and a large demand for electricity. The development and utilization of offshore wind energy resources is of great significance to meeting my country's electricity demand, improving the energy structure, reducing environmental pollution, and promoting sustainable economic development. Offshore wind power has a broader development prospect.

[0003] The electrical equipment used on the DC side of my country's DC transmission system are all open-type equipment. DC disconnectors, grounding switches, lightning arresters, insulating wall bushings, etc. have been successfully developed and applied in my country's UHV DC projects. However, the equipment occupies a large area, has a large height, a high center of gravity, and exposed live parts such as isolation and grounding switches. In addition, there is a risk of flashover on the surface of insulators during long-term operation, which cannot meet the environmental requirements of cost reduction, low maintenance, and high humidity and salt fog in offshore power stations.

[0004] DC gas-insulated metal-enclosed switchgear, with its high operating reliability, excellent resistance to high humidity and high salt spray, compact structure and low maintenance, will be the inevitable choice for offshore wind power DC transmission equipment. However, in terms of equipment development, the development of disconnectors, grounding switches, lightning arresters, etc. for DC GIS has not yet been carried out, but the corresponding development technology of open equipment can still provide technical support for the development of DC GIS equipment.

[0005] Regarding DC GIS arrester technology, due to the different protected equipment, the continuous operating voltage of DC arresters can be divided into AC (not necessarily fundamental wave), DC (containing a small amount of ripple), superposition of AC and DC (and phase change overshoot), etc. Some DC arresters do not even have obvious continuous operating voltage, which makes the test complicated and difficult, especially the action load test; when the system is operating or fails, some DC arresters bear much more energy than AC arresters, so they are forced to adopt a multi-column resistor parallel structure; the high-voltage DC converter station has different configurations and mutual influences and constraints between the arresters, which is much more complicated than the AC arrester configuration. In short, compared with AC arresters, DC arresters have the characteristics of large differences in continuous operating voltage waveforms, large energy, and complex research work. It is necessary to overcome technical difficulties such as resistor parallel shunt control technology, voltage balancing and electric field strength control technology, and large-capacity ZnO resistor research and development technology. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a GIS lightning arrester in view of the deficiencies in the prior art.

[0007] The technical solution of the present invention for solving the above technical problems is as follows: a GIS lightning arrester comprises a tank body, a first flange, a second flange, a core assembly and an insulator, wherein the core assembly is installed in the tank body, the first flange and the second flange are respectively installed at two ends of the tank body, a bypass is opened on the side wall of the tank body, and the insulator is installed on the bypass; a first connecting conductor and a second connecting conductor are connected to the core assembly, the first connecting conductor is arranged in the bypass and connected to the insulator, the second connecting conductor is arranged close to the first flange and a first shielding cover is installed between the second flange; the core assembly adopts a multi-column resistor parallel structure, and each column resistor includes multiple resistors connected in series.

[0008] The beneficial effects of the present invention are as follows: during the normal operation of the GIS arrester of the present invention, the system voltage is applied to the arrester, and the charge rate of the arrester can be controlled to 85%, ensuring the safety of the long-term operation of the arrester. When the system has an overvoltage, the residual pressure on the arrester is controlled by the number of series and parallel connections of the core component resistors, thereby protecting the insulation of the electrical equipment from being damaged and absorbing the energy of this process.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a supporting insulating platform is provided on the first flange, and the first shielding cover is installed between the supporting insulating platform and the second connecting conductor.

[0011] The beneficial effect of adopting the above further solution is that the supporting insulating platform is installed between the first flange and the second connecting conductor, which can play the role of high voltage isolation and mechanical support. The first shielding cover is installed between the supporting insulating platform and the second connecting conductor, which can play the role of uniform electric field.

[0012] Furthermore, a second shielding cover is connected between the second connecting conductor and the core component.

[0013] The beneficial effect of adopting the above further solution is that the second shielding cover can play a role in uniformizing the electric field and improving voltage distribution.

[0014] Furthermore, a third shielding cover is provided in the middle of the core assembly.

[0015] The beneficial effect of adopting the above further solution is that the third shielding cover is installed in the middle of the core assembly, mainly playing the role of uniform electric field.

[0016] Furthermore, a supporting insulating cylinder is provided in the tank body, and the core assembly is installed in the supporting insulating cylinder.

[0017] The beneficial effect of adopting the above further solution is that the supporting insulating cylinder can be installed between the second connecting conductor and the grounding terminal, which can play a mechanical supporting role for the core assembly.

[0018] Furthermore, the core assembly includes a 4-column resistor sheet parallel structure, and each resistor sheet column includes 158 resistor sheets connected in series.

[0019] The beneficial effect of adopting the above further scheme is that the number of resistors in series determines the reference voltage of the arrester, which in turn affects the voltage distribution unevenness coefficient of the arrester, the charge rate of the arrester and the residual voltage of the arrester. The number of resistors in parallel determines the size of the arrester capacitance and the matching current of the resistor column (the more parallel columns, the smaller the current of each resistor column), which in turn affects the voltage distribution unevenness coefficient of the arrester, the charge rate of the arrester, the residual voltage of the arrester, and the absorbed energy. By adopting an appropriate number of parallel structures and the number of series resistors, considering the installation space and other conditions, the charge rate of the arrester can be made less than 85% at a more economical cost.

[0020] Furthermore, the core assembly is a multi-segment structure arranged in sections, each section structure includes a multi-column resistor sheet parallel structure, and each resistor sheet column includes a plurality of resistor sheets connected in series.

[0021] The beneficial effects of adopting the above further solution are: compact structure and more economical and applicable.

[0022] Furthermore, the core assembly includes an upper and lower structure. The upper structure includes a 4-column resistor parallel structure, and each resistor column includes 81 resistors connected in series; the lower structure includes a 4-column resistor parallel structure, and each resistor column includes 77 resistors connected in series.

[0023] The beneficial effect of adopting the above further scheme is: adopting the core component of the upper and lower sections and adopting a reasonable series-parallel structure of resistors to control the charge rate of the lightning arrester to 85%, ensuring the safety of the long-term operation of the lightning arrester.

[0024] Furthermore, the diameter of the first shielding cover is 600-650 mm, and the height is 110-150 mm; the diameter of the second shielding cover is 600-650 mm, and the height is 800-900 mm; the diameter of the third shielding cover is 700-750 mm, and the height is 200-300 mm.

[0025] Furthermore, the core assembly is connected to a grounding terminal, and the grounding terminal is arranged on the second flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the GIS lightning arrester of the present invention in the main viewing state;

[0027] Figure 2 It is a schematic diagram of the internal structure of the GIS lightning arrester of the present invention when viewed from above.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Insulator; 2. First connecting conductor; 3. Insulating support platform; 4. First shielding cover; 5. Second connecting conductor; 6. Second shielding cover; 7. Supporting insulating cylinder; 8. Core assembly; 9. Third shielding cover; 10. Tank body; 11. First flange; 12. Second flange; 13. Grounding terminal. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2As shown, a GIS lightning arrester of this embodiment includes a tank body 10, a first flange 11, a second flange 12, a core assembly 8 and an insulator 1, wherein the core assembly 8 is installed in the tank body 10, the first flange 11 and the second flange 12 are respectively installed at both ends of the tank body 10, a bypass is provided on the side wall of the tank body 10, and the insulator 1 is installed on the bypass; the core assembly 8 is connected with a first connecting conductor 2 and a second connecting conductor 5, the first connecting conductor 2 is arranged in the bypass and connected to the insulator 1, the second connecting conductor 5 is arranged close to the first flange 11 and a first shielding cover 4 is installed between the first flange 11; the core assembly 8 adopts a multi-column resistor parallel structure, and each column resistor includes multiple resistors connected in series. The insulator 1 is used to connect the first connecting conductor 2 and the tank body 10, which mainly plays the role of high voltage isolation and mechanical support. The first connecting conductor 2 connects the insulator 1 and the core assembly 8, which mainly plays the role of conductive connection.

[0032] The resistor of the core assembly 8 can be a high-resistance zinc oxide resistor, combined with parallel shunt technology, so that the arrester absorption capacity is greater than 25.8MJ.

[0033] The core assembly 8 can adopt a multi-column resistor parallel structure of 2 columns, 3 columns, 4 columns, 5 columns, 6 columns, 7 columns, 8 columns, etc. In consideration of economy, by increasing the number of resistors in parallel, the main capacitance of the arrester is increased, the influence of the arrester on the stray capacitance of the ground is reduced, and the voltage distribution coefficient of the arrester is reduced, so that the charge rate of the arrester is less than 85%.

[0034] Each column of resistors may include 20 resistors in series, 30 resistors in series, 40 resistors in series, 50 resistors in series, 60 resistors in series, 70 resistors in series, 80 resistors in series, 90 resistors in series, 100 resistors in series, 110 resistors in series, 120 resistors in series, 130 resistors in series, 140 resistors in series, 150 resistors in series, 160 resistors in series, etc. In consideration of the residual voltage requirement of the arrester, the reference voltage of the arrester is increased by increasing the number of resistors in series, thereby making the charge factor of the arrester less than 85%.

[0035] like Figure 1 and Figure 2As shown, the specific implementation of this embodiment is that the core assembly 8 of this embodiment includes a 4-column resistor parallel structure, and each column resistor includes 158 resistors in series. The DC reference voltage of the arrester in this embodiment is 800kV, and the energy absorption capacity of the arrester is greater than 25.8MJ. The number of resistors in series determines the reference voltage of the arrester, which in turn affects the voltage distribution unevenness coefficient of the arrester, the charge rate of the arrester, and the residual voltage of the arrester. The number of resistors in parallel determines the size of the arrester capacitance and the matching current of the resistor column (the more parallel columns, the smaller the current of each resistor column), which in turn affects the voltage distribution unevenness coefficient of the arrester, the charge rate of the arrester, the residual voltage of the arrester, and the absorbed energy. By adopting an appropriate number of parallel structures and the number of series resistors, considering the installation space and other conditions, the arrester charge rate can be made less than 85% at a more economical cost.

[0036] like Figure 1 and Figure 2 As shown, the second specific implementation mode of this embodiment is that the core assembly 8 of this embodiment includes a 6-column resistor parallel structure, and each column of resistors includes 147 resistors connected in series.

[0037] like Figure 1 and Figure 2 As shown, the specific implementation mode three of this embodiment is that the core assembly 8 of this embodiment includes a 3-column resistor sheet parallel structure, and each column resistor sheet includes 166 resistor sheets connected in series.

[0038] like Figure 1 As shown, an optional solution of this embodiment is that the core assembly 8 is a multi-segment structure arranged in sections, each section structure includes a multi-column resistor sheet parallel structure, and each column resistor sheet includes multiple resistor sheets connected in series. The core assembly adopts a multi-segment structure arranged in sections, which is compact and more economical and applicable.

[0039] like Figure 1 and Figure 2 As shown, the fourth specific implementation of this embodiment is that the core assembly 8 includes an upper and lower two-stage structure, the upper stage structure includes a 4-column resistor parallel structure, each column resistor includes 81 resistors connected in series; the lower stage structure includes a 4-column resistor parallel structure, each column resistor includes 77 resistors connected in series. The core assembly with an upper and lower two-stage structure and a reasonable resistor series-parallel structure are adopted to control the charge rate of the arrester to 85%, ensuring the safety of the long-term operation of the arrester.

[0040] After test measurement, in the fourth embodiment of this invention, the capacitance of the single-chip resistor is 1500pF. According to the capacitance of the resistor, the voltage distribution of the arrester is analyzed and calculated, and the voltage distribution unevenness coefficient of the arrester is 1.68. Through test measurement, the DC reference voltage of the arrester is 828kV, and the peak value of the continuous operation voltage of the system is 403kV. The charge factor of the arrester is calculated to be 81.8% (<85%), (charge factor = (continuous operation voltage of the system relative to the ground / reference voltage of the arrester) * voltage distribution unevenness coefficient).

[0041] like Figure 1 and Figure 2 As shown, the fifth specific implementation of this embodiment is that the core assembly 8 includes an upper and lower two-stage structure, the upper stage structure includes a 5-column resistor sheet parallel structure, each column resistor sheet includes 74 resistor sheets connected in series; the lower stage structure includes a 5-column resistor sheet parallel structure, each column resistor sheet includes 68 resistor sheets connected in series. The core assembly with an upper and lower two-stage structure and a reasonable resistor sheet series-parallel structure are adopted to control the charge rate of the arrester to 85%, ensuring the safety of the long-term operation of the arrester.

[0042] like Figure 1 and Figure 2 As shown, the sixth specific implementation of this embodiment is that the core assembly 8 includes an upper and lower two-stage structure, the upper stage structure includes a 3-column resistor sheet parallel structure, each column resistor sheet includes 62 resistor sheets connected in series; the lower stage structure includes a 3-column resistor sheet parallel structure, each column resistor sheet includes 59 resistor sheets connected in series. The core assembly with an upper and lower two-stage structure and a reasonable resistor sheet series-parallel structure are adopted to control the charge rate of the lightning arrester to 85%, ensuring the safety of the long-term operation of the lightning arrester.

[0043] like Figure 1 As shown, in this embodiment, a supporting insulating platform 3 is provided on the first flange 11, and the first shielding cover 4 is installed between the supporting insulating platform 3 and the second connecting conductor 5. The supporting insulating platform 3 is installed between the first flange 11 and the second connecting conductor 5, and can play a role in high voltage isolation and mechanical support. The first shielding cover is installed between the supporting insulating platform and the second connecting conductor, and can play a role in uniform electric field.

[0044] like Figure 1 As shown, a second shielding cover 6 is connected between the second connecting conductor 5 and the core assembly 8 of this embodiment. The second shielding cover can play a role in uniform electric field and improving voltage distribution. The voltage distribution unevenness coefficient of the lightning arrester can be reduced by increasing the diameter of the second shielding cover 6 and increasing the length of the second shielding cover 6 extending into the core assembly, thereby making the charge rate of the lightning arrester less than 85%.

[0045] like Figure 1As shown, in this embodiment, a third shielding cover 9 is provided in the middle of the core assembly 8. The third shielding cover is installed in the middle of the core assembly, and mainly plays the role of uniform electric field.

[0046] like Figure 1 As shown, the core assembly 8 of this embodiment is connected to a grounding terminal 13 , and the grounding terminal 13 is connected to the second flange 12 .

[0047] like Figure 1 As shown, the tank 10 of this embodiment is provided with a supporting insulating cylinder 7, and the core assembly 8 is installed in the supporting insulating cylinder 7. The supporting insulating cylinder can be installed between the second connecting conductor and the grounding terminal, and can play a mechanical supporting role for the core assembly.

[0048] The diameter of the first shielding cover 4 of this embodiment is 600-650mm, which can be 620mm, 635mm, 640mm, 645mm, and the height is 110-150mm, which can be 120mm, 125mm, 130mm, 135mm, 140mm, 145mm; the diameter of the second shielding cover 6 is 600-650mm, which can be 610mm, 615mm, 620mm, 625mm, 630mm, 635mm, 640mm, 645mm, and the height is 800-900mm, which can be 8 The diameter of the third shielding cover 9 is 700-750mm, which can be selected as 710mm, 715mm, 720mm, 725mm, 730mm, 735mm, 740mm, 745mm, and the height is 200-300mm, which can be selected as 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm.

[0049] During the normal operation of the GIS arrester of this embodiment, the system voltage is applied to the arrester, which can control the charge rate of the arrester to 85%, ensuring the safety of the long-term operation of the arrester. When the system has an overvoltage, the residual pressure on the arrester is controlled by the number of series and parallel connections of the core component resistors, thereby protecting the insulation of the electrical equipment from being damaged and absorbing the energy of this process.

[0050] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A GIS lightning arrester, characterized in that: The invention comprises a tank body, a first flange, a second flange, a core assembly and an insulator, wherein the core assembly is installed in the tank body, the first flange and the second flange are respectively installed at two ends of the tank body, a bypass is provided on the side wall of the tank body, and the insulator is installed on the bypass; a first connecting conductor and a second connecting conductor are connected to the core assembly, the first connecting conductor is arranged in the bypass and connected to the insulator, the second connecting conductor is arranged close to the first flange and a first shielding cover is installed between the second connecting conductor and the first flange; the core assembly adopts a multi-column resistor parallel structure, and each column resistor includes a plurality of resistors connected in series; The first flange is provided with a supporting insulating platform, and the first shielding cover is installed between the supporting insulating platform and the second connecting conductor; A second shielding cover is connected between the second connecting conductor and the core assembly; a third shielding cover is provided in the middle of the core assembly; A supporting insulating cylinder is provided in the tank body, and the core assembly is installed in the supporting insulating cylinder; The core assembly is a multi-segment structure arranged in sections, each segment structure includes a multi-column resistor sheet parallel structure, and each resistor sheet column includes a plurality of resistor sheets connected in series.

2. A GIS lightning arrester according to claim 1, characterized in that: The core assembly includes a 4-column resistor sheet parallel structure, and each resistor sheet column includes 158 resistor sheets connected in series.

3. A GIS lightning arrester according to claim 1, characterized in that: The core assembly includes an upper and lower structure. The upper structure includes a 4-column resistor parallel structure, and each resistor column includes 81 resistors connected in series; the lower structure includes a 4-column resistor parallel structure, and each resistor column includes 77 resistors connected in series.

4. A GIS lightning arrester according to claim 1, characterized in that: The first shielding cover has a diameter of 600-650 mm and a height of 110-150 mm.

5. A GIS lightning arrester according to claim 1, characterized in that: The diameter of the second shielding cover is 600-650 mm, and the height is 800-900 mm; the diameter of the third shielding cover is 700-750 mm, and the height is 200-300 mm.

6. A GIS lightning arrester according to claim 1, characterized in that: The core assembly is connected to a grounding terminal, and the grounding terminal is arranged on the second flange.

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