A high-voltage GIS surge arrester based on N2 / O2 mixed gas

Abstract

The utility model relates to a high pressure GIS lightning arrester based on mixed gas belongs to electric power equipment technical field, including protection cap, insulator, casing, insulating core, conducting rod, shield case and base, the casing is filled with mixed gas as insulating medium, the utility model uses mixed gas as insulating medium, and mixed gas has good insulation performance, and the insulation performance can reach or even surpass gas level under certain conditions, and greenhouse effect coefficient is extremely low, and liquefaction temperature is lower, and need not extra buffer gas mixture. This effectively avoids the environmental pollution problem brought by gas, meets the urgent demand of global greenhouse gas emission reduction, and provides strong support for the environmental protection development of electric power industry.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, specifically relating to a method based on... High-voltage GIS surge arrester for mixed gas. Background Technology

[0002] Gas-insulated switchgear (GIS) is an indispensable key transmission and transformation equipment in modern power grids. It consists of electrical components such as circuit breakers, disconnecting switches, grounding switches, current transformers (CTs), physical transformers (PTs), surge arresters, busbars, bushings, and cable heads. These components are assembled in a modular structure and completely enclosed in a sealed metal casing, utilizing gas with excellent insulating properties as the insulating and arc-extinguishing medium. GIS equipment is widely used in power systems due to its compact structure, high operational safety and stability, and minimal susceptibility to environmental factors.

[0003] Gases, due to their excellent arc-quenching properties and insulating strength, have long been the most widely used insulating medium in the power industry. However, When gases are subjected to corona and arcing in an electric field, they produce fluorine and sulfur compounds. These compounds are not only toxic but also corrosive, damaging insulating materials and thus affecting the product's lifespan. Furthermore, As a major greenhouse gas, greenhouse gas has an extremely high greenhouse effect coefficient, and its environmental impact is receiving increasing attention. With the urgent global need for greenhouse gas emission reduction, the development of a substitute... The development of environmentally friendly gases as insulating media has become a top priority for the power industry.

[0004] Against this backdrop, Mixed gases have been proposed as a new type of environmentally friendly insulating medium. The mixed gas has good insulation properties; under certain conditions, its insulation performance can reach or even exceed those of other gases. The level of the gas is low, and its greenhouse effect coefficient is extremely low; and The mixed gas has a low liquefaction temperature and does not require additional buffer gas mixing, making it a highly promising environmentally friendly insulating medium to replace... Gases are used in power systems. Therefore, there is an urgent need for a method that can... Mixed gases are used as insulating media in gas insulation equipment in the power industry. Utility Model Content

[0005] The purpose of this utility model is to address the lack of [specific technology / mechanism] in the existing technology. This paper addresses the shortcomings of using mixed gases as insulating media in gas-insulated equipment in the power industry, and proposes a design based on... High-voltage GIS surge arresters using mixed gases are proposed to address the problems existing in current technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A type based on A high-voltage GIS surge arrester containing a mixed gas includes a protective cap, insulator, housing, insulating core, conductive rod, shielding cover, and base; the housing is filled with... The mixed gas serves as the insulating medium; The insulator is installed on the top of the housing, and the protective cap covers the side of the insulator away from the housing. The protective cap is sealed to the housing, and the bottom of the housing is fastened to the base by bolts. The insulating core is centrally located inside the housing. The insulating core includes a resistor sheet assembly, an aluminum pad, and an insulating rod. The aluminum pad is located at the upper and lower ends of the resistor sheet assembly. The insulating rod passes through the central hole of the resistor sheet assembly and the aluminum pad and is fixedly connected to the resistor sheet assembly and the aluminum pad. The bottom end of the insulating rod is threaded to the upper end face of the base. One end of the conductive rod is connected to the end of the insulating rod away from the base. The other end of the conductive rod passes through the insulator and the protective cap and extends to the outside of the housing. The shielding cover is fitted over the outside of the conductive rod.

[0007] A further improvement to this technical solution is that the insulator is a disc insulator.

[0008] Further improvements to this technical solution include a cylindrical shell with a through-hole interior.

[0009] Further improvements to this technical solution include an explosion-proof device. A first through hole is provided on the base, and an explosion-proof flange is fixedly installed near the bottom of the base. The explosion-proof device is sealed and fixed to the base by the explosion-proof flange.

[0010] Further improvements to this technical solution include an explosion-proof device comprising a rupture disc and an explosion-proof cover. The rupture disc is mounted on the explosion-proof flange, and the explosion-proof cover covers the outside of the rupture disc to form a pressure relief channel. When the internal pressure of the housing exceeds a preset pressure threshold, the rupture disc ruptures and releases pressure through the pressure relief channel.

[0011] Further improvements to this technical solution include a low-voltage grounding terminal, a second through hole on the base, a low-voltage flange fixedly installed near the bottom of the base, and the low-voltage grounding terminal sealed and fixed to the base by the low-voltage flange; the low-voltage grounding element inside the housing is connected to the low-voltage grounding terminal via a wire passing through the second through hole, and the shield is electrically connected to the low-voltage grounding element.

[0012] Further improvements to this technical solution include the addition of several brackets, which are installed at the bottom of the base.

[0013] A further improvement to this technical solution includes an inflation valve, which is fixed to the housing via an inflation flange. The inflation valve injects an insulating medium into the housing. Mixed gases.

[0014] A further improvement to this technical solution is that the resistor array is composed of several resistors connected in series.

[0015] Further improvements to this technical solution include an accessory box, which is mounted on the housing and sealed to the housing. The accessory box contains a monitoring device that includes a pressure sensor and a temperature sensor, which is used to monitor the pressure and temperature inside the housing.

[0016] The beneficial effects of this utility model are as follows: This utility model adopts The mixed gas serves as the insulating medium. The mixed gas has good insulation properties, and under certain conditions, its insulation performance can reach or even exceed that of other gases. The gas level is low, its greenhouse effect coefficient is extremely low, and its liquefaction temperature is low, eliminating the need for additional buffer gas mixing. This effectively avoids... The environmental pollution caused by greenhouse gases aligns with the urgent global need for greenhouse gas emission reduction and provides strong support for the environmentally friendly development of the power industry.

[0017] The insulator is installed on the top of the housing, and a protective cap covers the side of the insulator away from the housing and is sealed to the housing. The bottom of the housing is fastened to the base with bolts. This sealing and connection method can effectively prevent... The leakage of mixed gases ensures the stability and insulation performance of the insulating medium inside the casing, while also enhancing the overall structural strength of the equipment and improving its operational stability in complex environments.

[0018] An explosion-proof device is installed and fixed to the base via an explosion-proof flange. The device includes a rupture disc and an explosion-proof housing. When the internal pressure exceeds a preset pressure threshold, the rupture disc ruptures and releases pressure through a pressure relief channel. This design allows for timely pressure release when abnormally high pressure occurs inside the equipment, preventing the housing from exploding due to excessive pressure and effectively ensuring the safety of the equipment and surrounding personnel.

[0019] The insulating core is centrally located inside the housing and consists of a resistor element assembly, aluminum pads, and an insulating rod. The aluminum pads are positioned at the top and bottom of the resistor element assembly, and the insulating rod passes through the central hole of both the resistor element assembly and the aluminum pads, providing a secure connection. This structure ensures stable installation of the resistor element assembly, promotes uniform current distribution, and improves the electrical performance of the surge arrester. The resistor element assembly is composed of several resistor elements connected in series, and its resistance value can be flexibly adjusted to meet the requirements of different voltage levels and electrical environments.

[0020] The shielding cover is fitted over the outside of the conductive rod and is electrically connected to the low-voltage grounding element. The low-voltage grounding element is connected to the low-voltage grounding terminal via a wire, and the low-voltage grounding terminal is fixed to the base via a low-voltage flange. This design effectively shields the electric field around the conductive rod, reduces electric field interference, improves the insulation performance and anti-interference capability of the surge arrester, and ensures that the current can be promptly conducted to the ground in the event of a fault, thus ensuring the safe operation of the equipment and the power grid.

[0021] Several brackets are installed at the bottom of the base to provide stable support for the installation of the equipment.

[0022] The accessory box is mounted on the housing and sealed. Inside the accessory box is a monitoring device containing a pressure sensor and a temperature sensor, enabling real-time monitoring of the internal pressure and temperature. By monitoring changes in internal pressure and temperature in real time, potential anomalies during equipment operation, such as gas leaks or excessively high temperatures, can be detected promptly. This allows for appropriate measures to be taken, preventing equipment failures and improving equipment reliability and lifespan.

[0023] Furthermore, the design principle of this utility model is reliable, the structure is simple, and it has a very wide range of application prospects.

[0024] It is evident that this utility model has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0026] Figure 1 This is a schematic diagram of the structure of the high-voltage GIS surge arrester.

[0027] 110 is the insulator, 120 is the housing, 131 is the insulating core, 132 is the conductive rod, 133 is the shielding cover, 140 is the base, 150 is the low-voltage grounding terminal, 160 is the explosion-proof device, 170 is the bracket, 180 is the air filling valve, and 190 is the accessory box. Detailed Implementation

[0028] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] like Figure 1 As shown, this utility model provides a method based on A high-voltage GIS surge arrester containing a mixed gas includes a protective cap, an insulator 110, a housing 120, an insulating core 131, a conductive rod 132, a shielding cover 133, and a base 140; the housing 120 is filled with... The mixed gas serves as the insulating medium.

[0031] Specifically, the shell 120 is cylindrical and internally continuous, and its interior is filled with 0.8 MPa of [unclear - possibly a specific pressure or pressure]. Mixed gas, and The volume ratio of the mixed gases is 8:2. This invention employs... The mixed gas serves as the insulating medium. The mixed gas has good insulation properties, and under certain conditions, its insulation performance can reach or even exceed that of other gases. The gas is at a low level, with an extremely low greenhouse effect coefficient and a low liquefaction temperature, eliminating the need for additional buffer gas mixing. This effectively avoids... The environmental pollution caused by greenhouse gases aligns with the urgent global need for greenhouse gas emission reduction and provides strong support for the environmentally friendly development of the power industry.

[0032] Insulator 110 is a disc insulator, installed on top of housing 120. A protective cap covers the side of insulator 110 away from housing 120, and the protective cap is sealed to housing 120. This sealed connection effectively prevents… The mixed gas leak is prevented, and external dust and moisture are also prevented from entering the housing 120 and affecting the insulation performance of the surge arrester. The bottom of the housing 120 is fastened to the base 140 by bolts, and a double-layer fluororubber sealing ring is set at the connection. This connection method is simple, reliable, and easy to install and maintain.

[0033] The insulating core 131 is centrally located inside the housing 120. The insulating core 131 includes a resistor sheet assembly, aluminum pads, and an insulating rod. The aluminum pads are located at the upper and lower ends of the resistor sheet assembly. The insulating rod (which can be made of epoxy resin) passes through the center holes of the resistor sheet assembly and the aluminum pads and is then fixedly connected to them. This connection method ensures the stable installation of the insulating core 131, promotes uniform current distribution, and improves the electrical performance of the surge arrester. The resistor sheet assembly consists of several resistor sheets connected in series. The resistor sheets can be zinc oxide resistor sheets, and conductive silicone grease is applied between each sheet to ensure reliable electrical connection. The resistance value can be flexibly adjusted according to actual needs to meet the requirements of different voltage levels and electrical environments. The bottom end of the insulating rod is threaded to the upper end face of the base 140. The base 140 is a welded structure of Q235 steel plate, with an M16 threaded hole on its upper end face. The thread at the bottom of the insulating rod is screwed into this threaded hole, with a tightening torque of [missing information]. .

[0034] One end of the conductive rod 132 is connected to the end of the insulating rod away from the base 140. The other end of the conductive rod 132 extends through the insulator 110 and the protective cap to the outside of the housing 120. The shield 133 is fitted over the outside of the conductive rod 132. The shield 133 is made of stainless steel mesh. The surge arrester also includes a low-voltage grounding terminal 150. A second through hole is provided on the base 140. A low-voltage flange is fixedly installed near the bottom of the base 140 through the second through hole. The low-voltage grounding terminal 150 is sealed and fixed to the base 140 through the low-voltage flange. The low-voltage grounding element inside the housing 120 is connected to the low-voltage grounding terminal 150 through a wire passing through the second through hole. The shield 133 is electrically connected to the low-voltage grounding element. The low-voltage grounding terminal 150 adopts a double-sealed structure (O-ring + sealant) and is fixed to the low-voltage flange at the bottom of the base 140 by M10 bolts. The conductive cross-sectional area of ​​the terminal is ≥50mm² and is connected to the grounding copper busbar (i.e., low-voltage grounding element) inside the housing 120 by a 16mm² copper cable.

[0035] This design can effectively shield the electric field around the conductive rod 132, reduce electric field interference, improve the insulation performance and anti-interference capability of the surge arrester, and at the same time ensure that the current can be introduced to the ground in time when the equipment fails, thus ensuring the safe operation of the equipment and the power grid.

[0036] In addition, the surge arrester also includes an explosion-proof device 160. A first through-hole is provided on the base 140, and an explosion-proof flange is fixedly installed near the bottom of the base 140 through the first through-hole. The explosion-proof device 160 is sealed and fixed to the base 140 via the explosion-proof flange. Specifically, the explosion-proof device 160 includes a rupture disc and an explosion-proof cover. The rupture disc is disposed on the explosion-proof flange, and the explosion-proof cover covers the outside of the rupture disc, forming a pressure relief channel. When the internal pressure of the housing 120 exceeds a preset pressure threshold, the rupture disc ruptures and releases pressure through the pressure relief channel. This design can release pressure in a timely manner when abnormally high pressure occurs inside the equipment, preventing the housing 120 from exploding due to excessive pressure, effectively ensuring the safety of the equipment and surrounding personnel.

[0037] Furthermore, the surge arrester also includes several brackets 170, which are mounted on the bottom of the base 140. This provides stable support for the installation of the equipment, facilitating its fixation in different terrains and installation environments, and improving the installation efficiency and stability of the equipment.

[0038] In addition, the surge arrester also includes an inflation valve 180, which is fixed to the housing 120 by an inflation flange provided on the housing 120. The inflation valve 180 injects an insulating medium into the housing 120. Mixed gas. Equipped with a check valve and pressure gauge (for easy monitoring of pressure data within housing 120), it is filled via a high-pressure hose connected to a gas cylinder. This design allows for convenient and quick replenishment or replacement of the insulating medium during equipment operation, reducing maintenance costs and complexity.

[0039] To facilitate staff understanding of the surge arrester's operation, this invention also includes an accessory box 190, which is mounted on the housing 120. The accessory box 190 and housing 120 are sealed together, meaning they can be fixed with M6 bolts and sealed with a sealing strip. The accessory box 190 contains a monitoring device including a pressure sensor and a temperature sensor, as well as a communication module (existing technology, not described in detail here) that transmits the monitored pressure and temperature data to a remote terminal. The monitoring device is used to monitor the pressure and temperature inside the housing 120 in real time. By monitoring the pressure and temperature changes inside the housing 120 in real time, potential anomalies during equipment operation, such as gas leaks or excessively high temperatures, can be detected promptly, allowing for appropriate measures to be taken, preventing equipment failures, and improving equipment reliability and lifespan.

[0040] The working principle of this surge arrester is as follows: This is based on For high-voltage GIS surge arresters using mixed gases, during normal operation, the enclosure temperature is 120°C. The mixed gas provides reliable insulation. The shield 133 uniformly distributes the electric field around the conductive rod and conducts the small induced current through the low-voltage terminal 150. The resistor array is in a high-resistance state, which does not affect normal power transmission. When encountering lightning or switching overvoltage, if the voltage exceeds the operating threshold of the resistor array, it becomes a low-resistance state, providing a low-impedance path for the overvoltage current. That is, the current generated by the overvoltage is introduced to the ground through the conductive rod 132, limiting the overvoltage amplitude and protecting the power grid equipment. The shield 133 shields the electric field around the conductive rod, reducing interference and guiding the current to the ground in case of a fault. At the same time... The mixed gas maintains insulation and extinguishes the arc; after the overvoltage disappears, the resistor array returns to a high-resistance state. In addition, when the internal pressure of the explosion-proof device 160 exceeds the preset value, the rupture disc ruptures to release pressure and prevent explosion; the monitoring device in the accessory box 190 monitors the gas pressure and temperature inside the housing in real time to detect abnormalities in a timely manner and perform maintenance, ensuring the stable operation of the surge arrester.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method based on High-voltage GIS surge arrester with mixed gas, characterized in that, Includes a protective cap, insulator (110), housing (120), insulating core (131), conductive rod (132), shielding cover (133), and base (140); the housing (120) is filled with The mixed gas serves as the insulating medium; The insulator (110) is installed on the top of the housing (120), and the protective cap covers the side of the insulator (110) away from the housing (120). The protective cap is sealed to the housing (120), and the bottom of the housing (120) is fastened to the base (140) by bolts. An insulating core (131) is centrally located inside the housing (120). The insulating core (131) includes a resistor sheet group, an aluminum pad, and an insulating rod. The aluminum pad is located at the upper and lower ends of the resistor sheet group. The insulating rod passes through the center hole of the resistor sheet group and the aluminum pad and is fixedly connected to the resistor sheet group and the aluminum pad. The bottom end of the insulating rod is threaded to the upper end face of the base (140). One end of the conductive rod (132) is connected to the end of the insulating rod away from the base (140). The other end of the conductive rod (132) passes through the insulator (110) and the protective cap and extends to the outside of the housing (120). The shield (133) is sleeved on the outside of the conductive rod (132).

2. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, The insulator (110) is a disc insulator.

3. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, The shell (120) is columnar and internally connected.

4. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, It also includes an explosion-proof device (160), a first through hole is provided on the base (140), an explosion-proof flange is fixedly installed near the bottom of the base (140) and the explosion-proof device (160) is sealed and fixed on the base (140) by the explosion-proof flange.

5. The method based on claim 4 High-voltage GIS surge arrester with mixed gas, characterized in that, The explosion-proof device (160) includes a rupture disc and an explosion-proof cover. The rupture disc is installed on the explosion-proof flange, and the explosion-proof cover covers the outside of the rupture disc to form a pressure relief channel. When the internal pressure of the housing (120) exceeds the preset pressure threshold, the rupture disc ruptures and releases pressure through the pressure relief channel.

6. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, It also includes a low-voltage grounding terminal (150), a second through hole is provided on the base (140), a low-voltage flange is fixedly installed near the bottom of the base (140) of the second through hole, and the low-voltage grounding terminal (150) is sealed and fixed on the base (140) by the low-voltage flange; the low-voltage grounding element inside the housing (120) is connected to the low-voltage grounding terminal (150) through the wire passing through the second through hole, and the shield (133) is electrically connected to the low-voltage grounding element.

7. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, It also includes several brackets (170), which are mounted on the bottom of the base (140).

8. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, It also includes an inflation valve (180), which is fixed to the housing (120) by an inflation flange provided on the housing (120). An insulating medium is injected into the housing (120) through the inflation valve (180). Mixed gases.

9. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, A resistor array consists of several resistors connected in series.

10. The method based on claim 1 High-voltage GIS surge arrester with mixed gas, characterized in that, It also includes an accessory box (190), which is mounted on the housing (120). The accessory box (190) and the housing (120) are sealed together. The accessory box (190) contains a monitoring device including a pressure sensor and a temperature sensor. The monitoring device is used to monitor the pressure and temperature inside the housing (120).

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