GIS lightning arrester

Abstract

The utility model relates to a GIS lightning arrester which comprises a shell, an insulator and a lightning arrester core body, the shell is provided with an inner cavity and an opening communicated with the inner cavity, the insulator is arranged at the opening of the shell in a sealed mode, the insulator and the shell form a sealed air chamber in a surrounding mode, namely the insulator is matched with the shell at the opening of the shell in a sealed mode, and the lightning arrester core body is arranged in the shell. The sealed gas chamber is filled with mixed gas of N2 and O2, the lightning arrester core is arranged in the inner cavity, and the lightning arrester core is electrically connected with the insulator. The GIS lightning arrester adopts the mixed gas of N2 and O2 as the insulating gas, the components of the mixed gas of N2 and O2 are close to those of air, and the mixed gas of N2 and O2 is not a greenhouse gas, so that the GIS lightning arrester can replace the existing gas to meet the industrial use requirements of insulating property, no toxicity, no harm, non-flammable property and the like, and meanwhile, the negative influence on the environment is avoided.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, and in particular to a GIS surge arrester. Background Technology

[0002] Compared with open-type surge arresters, GIS surge arresters have advantages such as low height, low center of gravity, small size, light weight, small footprint, and easy installation, and are therefore widely used.

[0003] Currently, GIS surge arresters primarily use sulfur hexafluoride (SF6) gas as the insulation and arc-quenching medium. However, SF6 is a significant greenhouse gas, with a global warming potential approximately 23,900 times that of CO2, and is listed as one of the six restricted greenhouse gases in the Kyoto Protocol. Therefore, those skilled in the art urgently need to find an environmentally friendly insulation medium to replace SF6 gas, which can maintain insulation performance similar to SF6 gas, meet industrial application requirements such as being non-toxic, harmless, and non-flammable, and also avoid negative environmental impacts. Utility Model Content

[0004] The purpose of this utility model is to provide a GIS surge arrester that has an environmentally friendly insulating medium, meets the requirements for insulation performance and industrial use such as non-toxicity, harmlessness, and non-flammability, while avoiding negative impacts on the environment.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A GIS surge arrester, comprising:

[0007] A housing having an inner cavity and an opening communicating with the inner cavity;

[0008] An insulator is sealed at the opening of the housing, and the insulator and the housing form a sealed gas chamber filled with a mixture of N2 and O2 gas.

[0009] A surge arrester core is disposed in the inner cavity and is electrically connected to the insulator.

[0010] In one embodiment of this application, the opening is located at the top center of the housing.

[0011] In one embodiment of this application, the surge arrester core includes, from top to bottom, a conductive rod, a first shielding cover, and a core column. The conductive rod is electrically connected to the insulator. The core column adopts a multi-resistor column parallel structure, and the resistor column includes multiple resistors connected in series.

[0012] In one embodiment of this application, the surge arrester core further includes an insulating limiting structure for limiting the position of the resistor column.

[0013] In one embodiment of this application, the insulating limiting structure includes a plurality of insulating rods arranged circumferentially around the resistor plate post. Each insulating rod is arranged parallel to the resistor plate post and clamps and fixes the resistor plate post. The upper end of the insulating rod is connected to the first shielding cover, and the lower end of the insulating rod is connected to the inner wall surface of the housing.

[0014] In one embodiment of this application, the conductive rod is provided with a contact finger, and the insulator is provided with a contact seat. The contact finger cooperates with the contact seat to electrically connect the conductive rod and the insulator.

[0015] In one embodiment of this application, a second shielding cover is further included, which is sleeved over the conductive rod.

[0016] In one embodiment of this application, the housing is provided with an inflation valve for inflating the sealed gas chamber.

[0017] In one embodiment of this application, the housing is provided with an explosion-proof device for releasing the gas pressure in the sealed gas chamber, and the explosion-proof device and the inflation valve are respectively located on both sides of the housing.

[0018] In one embodiment of this application, the housing is provided with a monitor for monitoring the leakage current of the GIS surge arrester.

[0019] As can be seen from the above technical solution, this utility model discloses a GIS surge arrester, which includes a shell, an insulator, and a surge arrester core. The shell has an inner cavity and an opening communicating with the inner cavity. The insulator is sealed at the opening of the shell, and the insulator and the shell form a sealed gas chamber, that is, the insulator is sealed with the shell at the opening of the shell. The sealed gas chamber is filled with a mixture of N2 and O2 gas. The surge arrester core is disposed in the inner cavity, and the surge arrester core is electrically connected to the insulator.

[0020] The aforementioned GIS surge arrester uses a mixture of N2 and O2 gas as the insulating gas. The composition of this N2 and O2 gas mixture is similar to that of air and is not a greenhouse gas. It can replace existing gaseous surge arresters that meet the requirements for insulation performance, non-toxicity, harmlessness, and non-flammability in industrial applications, while avoiding negative environmental impacts. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of a GIS surge arrester provided in an embodiment of this utility model;

[0023] Figure 2 A cross-sectional view of the arrester core of the GIS surge arrester provided in an embodiment of this utility model.

[0024] In the picture:

[0025] 1 is an insulator; 2 is a housing; 3 is a second shield; 4 is a contact finger; 5 is a conductive rod; 6 is a first shield; 7 is a resistor column; 8 is an insulating rod; 9 is an inflation valve; 10 is a monitor; 11 is an explosion-proof device. Detailed Implementation

[0026] The core of this utility model is to provide a GIS surge arrester. The structural design of this GIS surge arrester makes it have an environmentally friendly insulating medium, which meets the requirements of insulation performance, non-toxicity, harmlessness and non-flammability for industrial use, while avoiding negative impacts on the environment.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0030] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] Please see Figure 1 , Figure 1 A schematic diagram of the structure of a GIS surge arrester provided in an embodiment of this utility model.

[0033] This utility model discloses a GIS surge arrester, which includes a housing 2, an insulator 1, and a surge arrester core.

[0034] The housing 2 has an inner cavity and an opening communicating with the inner cavity. The insulator 1 is sealed at the opening of the housing 2, and the insulator 1 and the housing 2 form a sealed gas chamber. That is, the insulator 1 is sealed with the housing 2 at the opening of the housing 2. The sealed gas chamber is filled with a mixture of N2 and O2 gas, wherein the volume ratio of N2 gas to O2 gas in the N2 and O2 gas mixture is 7:3, and the filling pressure is 0.8MPa. The surge arrester core is set in the inner cavity and is electrically connected to the insulator 1. The GIS surge arrester can divert energy by arranging multiple columns of surge arrester core in parallel in the housing 2. The surge arrester core can adopt a multi-resistor column parallel structure with 2 columns, 3 columns, 4 columns, 5 columns, 6 columns, 7 columns, 8 columns, etc. Taking economic efficiency into consideration, by increasing the number of parallel resistor columns 7, the main electrical capacity of the GIS surge arrester can be increased, the impact of stray capacitance to ground of the surge arrester can be reduced, the voltage distribution unevenness coefficient of the surge arrester can be reduced, and thus the charge rate of the surge arrester can be less than 85%.

[0035] Compared with the prior art, the GIS surge arrester provided in this utility model embodiment uses a mixture of N2 and O2 gas as the insulating gas. The composition of the N2 and O2 gas mixture is similar to that of air and is not a greenhouse gas. It can replace the existing technology and meet the requirements of insulation performance, non-toxicity, harmlessness and non-flammability for industrial use, while avoiding negative impacts on the environment.

[0036] In existing GIS surge arresters using SF6 gas as the insulating medium, a bypass structure is typically installed on one side of the casing 2, and the insulator 1 is mounted on the bypass structure. The pressure of the SF6 gas is 0.2MPa~0.5MPa. However, in this application, the filling pressure of the N2 and O2 mixed gas is 0.8MPa, which is higher than the pressure when SF6 gas is used as the insulating medium. Therefore, in order to ensure that the strength of the casing 2 meets the requirements and improve the safety of the GIS surge arrester, such as... Figure 1 As shown, in one embodiment of this application, the opening is located at the top center of the housing 2.

[0037] In this application, insulator 1 is a basin-type insulator 1.

[0038] like Figure 1 As shown in one embodiment of this application, the surge arrester core, from top to bottom, includes a conductive rod 5, a first shielding cover 6, and a core column. The conductive rod 5 is electrically connected to the insulator 1. The core column adopts a parallel structure of multiple resistor column 7, each resistor column 7 comprising multiple resistors connected in series. The resistor column 7 may include dozens to hundreds of resistors connected in series. Considering the residual voltage requirements of the GIS surge arrester, the reference voltage of the GIS surge arrester is increased by increasing the number of resistors connected in series.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment of this application, the surge arrester core further includes an insulating limiting structure for limiting the resistor column 7. The insulating limiting structure is used to support and limit the resistor column 7 to ensure the stability of the resistor column 7.

[0040] Specifically, such as Figure 2 As shown, the insulation limiting structure includes multiple insulating rods 8 arranged circumferentially around the resistor plate post 7. Each insulating rod 8 is parallel to the resistor plate post 7 and clamps and fixes the resistor plate post 7. The upper end of the insulating rod 8 is connected to the first shielding cover 6, and the lower end of the insulating rod 8 is connected to the inner wall surface of the housing 2. The first shielding cover 6 can play a role in uniformizing the electric field and improving the voltage distribution. The voltage distribution non-uniformity coefficient of the surge arrester can be reduced by increasing the diameter of the first shielding cover 6 and increasing the length of the first shielding cover 6 extending into the core assembly.

[0041] like Figure 1 As shown, the conductive rod 5 is provided with a contact finger 4, and the insulator 1 is provided with a contact seat. The contact finger 4 cooperates with the contact seat to electrically connect the conductive rod 5 and the insulator 1.

[0042] To further optimize the above technical solution, the GIS surge arrester also includes a second shield 3, which is fitted over the conductive rod 5. The second shield 3 can further reduce interference.

[0043] To facilitate the filling of the casing 2 with a mixture of N2 and O2 gases, such as Figure 1 As shown, housing 2 is provided with an inflation valve 9 for inflating the sealed gas chamber.

[0044] During thermal collapse of a GIS surge arrester, the gas inside the arrester needs to be released, therefore... Figure 1 As shown, the housing 2 is equipped with an explosion-proof device 11, which is used to release the gas pressure in the sealed gas chamber to ensure that the arrester housing 2 will not be damaged by excessive gas pressure. In order to ensure that the gas is released in a safe direction, the explosion-proof device 11 and the gas filling valve 9 are located on both sides of the housing 2 respectively.

[0045] To further optimize the above technical solution, in one embodiment of this application, the GIS surge arrester also includes a monitor 1013 for monitoring the leakage current of the GIS surge arrester, so as to observe, monitor and judge the operating status of the surge arrester.

[0046] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A GIS surge arrester, characterized in that, include: A housing having an inner cavity and an opening communicating with the inner cavity; An insulator is sealed at the opening of the housing, and the insulator and the housing form a sealed gas chamber filled with a mixture of N2 and O2 gas. A surge arrester core is disposed in the inner cavity and is electrically connected to the insulator.

2. The GIS surge arrester according to claim 1, characterized in that, The opening is located at the top center of the housing.

3. The GIS surge arrester according to claim 1, characterized in that, The surge arrester core comprises, from top to bottom, a conductive rod, a first shield, and a core column. The conductive rod is electrically connected to the insulator. The core column adopts a multi-resistor column parallel structure, and the resistor column includes multiple resistors connected in series.

4. The GIS surge arrester according to claim 3, characterized in that, The surge arrester core also includes an insulating limiting structure for limiting the position of the resistor column.

5. The GIS surge arrester according to claim 4, characterized in that, The insulating limiting structure includes multiple insulating rods arranged circumferentially around the resistor plate column. Each insulating rod is parallel to the resistor plate column and clamps and fixes the resistor plate column. The upper end of each insulating rod is connected to the first shielding cover, and the lower end of each insulating rod is connected to the inner wall surface of the housing.

6. The GIS surge arrester according to any one of claims 3-5, characterized in that, The conductive rod is provided with a contact finger, and the insulator is provided with a contact seat. The contact finger cooperates with the contact seat to electrically connect the conductive rod and the insulator.

7. The GIS surge arrester according to any one of claims 3-5, characterized in that, It also includes a second shielding cover, which is fitted over the conductive rod.

8. The GIS surge arrester according to any one of claims 1-5, characterized in that, The housing is provided with an inflation valve for inflating the sealed gas chamber.

9. The GIS surge arrester according to claim 8, characterized in that, The housing is equipped with an explosion-proof device for releasing the gas pressure in the sealed gas chamber. The explosion-proof device and the inflation valve are located on opposite sides of the housing.

10. The GIS surge arrester according to any one of claims 1-5, characterized in that, The housing is equipped with a monitor for monitoring the leakage current of the GIS surge arrester.

Images