A test device for testing GIS pot-type insulator fracture failure

Abstract

The present invention relates to the field of GIS technology and discloses a test device for testing GIS pot-type insulator fracture failure. The device comprises a pot-type insulator body with a through-hole formed on a radial surface thereof. The test device for testing GIS pot-type insulator fracture failure simulates the internal gas environment of the pot-type insulator body under actual operating conditions by introducing SF₂ gas into a first cavity and a second cavity via an inflation device. A sealing ring simultaneously fills the gaps between the pot-type insulator body, the base, and the gland to prevent SF₂ gas from leaking through the gaps between the pot-type insulator body, the base, and the gland, thereby affecting the simulated working environment. The device then operates under the single-variable principle of a pressure-applying device to drive the gland to apply an axial force to the pot-type insulator body, thereby simulating the pressure effect of the GIS tank weight on the pot-type insulator body under actual operating conditions. This achieves the effect of simply and conveniently simulating the failure and cracking mechanism of the pot-type insulator body using a single control variable.

Description

Technical Field

[0001] The invention relates to the technical field of GIS, and in particular to a testing device for testing the fracture failure of a GIS pot-type insulator. Background Art

[0002] GIS stands for Gas Insulated Switcher, also known as a gas-insulated, fully enclosed switchgear. The busbar structure of a gas-insulated, fully enclosed switchgear primarily consists of basin insulators, metal conductors, and busbar conductors. Since its practical application in the 1960s, the emergence of GIS equipment has revolutionized the development of high-voltage electrical equipment and distribution equipment. GIS, characterized by stable operation, compact structure, and strong adaptability, has been widely adopted in power supply systems in recent years. It is a crucial component of my country's "West-to-East Power Transmission, North-to-South Power Supply" energy structure and the development of future power grids.

[0003] Statistics show that the higher the voltage range, the more susceptible the corresponding insulation system is to failure, resulting in greater GDP losses. Furthermore, high-voltage electrical equipment that has been in operation for a long time will experience aging issues, leading to a higher rate of failure. Furthermore, the fully sealed structure of GIS makes fault location and repair difficult, resulting in complex maintenance work, long average outage times after incidents, and widespread outages. This places significant pressure on the normal operation of the power supply system.

[0004] As insulating equipment, GIS equipment must come into contact with conductors at various electrical potentials and inevitably respond to sudden flashovers or discharges. Insulation failure is the most common cause of failure. Furthermore, as part of a vast power system, GIS equipment must withstand complex stress loads. Excessive loads during installation, aging of equipment materials, or sudden environmental changes can all lead to stress concentration in GIS equipment. If any of these factors are too significant, or if several factors act together, some equipment with poor mechanical properties may be at risk of failure, posing a hazard to the operation of the high-voltage power system.

[0005] Insulating gas leakage is a common failure mode for GIS equipment. SF6 is the primary insulating gas used in GIS equipment. When SF6 leaks due to a malfunction in the equipment, it significantly reduces the arc extinguishing performance and dielectric strength of the GIS equipment, impacting the normal operation of the high-voltage equipment. Furthermore, the leaked SF6 gas poses a threat to the health and safety of personnel involved. According to relevant records, GIS equipment leakage primarily occurs in the brittle composite material pot insulators. In recent years, analyzing the various failure causes of pot insulators and improving their performance have become a hot topic for researchers in various fields.

[0006] Basin insulators are a crucial component of high-voltage switchgear (GIS). They support high-voltage conductors, support tubular busbars, isolate different gas chambers, and insulate the ground and electrical equipment within GIS equipment. However, the complex operating environment of the power grid and the long service life of the equipment often lead to many uncertainties. These factors compound the weaknesses of basin insulators, making them a key component of the GIS system and a major cause of GIS equipment failure. According to statistics, during a 2020 inspection of potential hazards in a local substation system, 19 cracks were discovered in 15 basin insulators. Cracks in basin insulators significantly increase the risk of leakage of the SF6 gas contained within them, posing a serious threat to the normal operation of GIS equipment.

[0007] The industry often uses finite element analysis to analyze the causes of pot insulator cracking. However, this often simplifies the external environmental conditions of the pot insulator, and the reliability of its conclusions requires further verification. Based on current research, we intend to construct a test device for GIS pot insulator fracture failure. This device simulates the primary operating environment to which pot insulators are subjected, and through experimental investigation, we will analyze the mechanisms of pot insulator failure and cracking. Summary of the Invention

[0008] (1) Technical problems solved

[0009] In response to the shortcomings of the existing technology, the present invention provides a test device for testing the fracture failure of GIS pot-type insulators. The device has the advantages of being simple and convenient, simulating the failure and cracking mechanism of pot-type insulators with a single control variable, and solving the problem that the working environment of the power grid is complex and the equipment has a long service life, and there are often many uncertain factors. Under the superposition of various uncertain factors, the pot-type insulator also becomes a weak point in the GIS system and a major cause of GIS equipment failure. The problem of pot-type insulator failure and cracking is analyzed by studying factors such as the pressure of SF6 gas and the gravity given by the upper device.

[0010] (2) Technical solution

[0011] In order to achieve the above-mentioned purpose of simulating the failure and cracking mechanism of a pot-type insulator with a simple and convenient single control variable, the present invention provides the following technical solutions: a test device for testing the fracture failure of a GIS pot-type insulator, comprising a pot-type insulator body, a through hole being provided on the radial surface of the pot-type insulator body, and a base, which is arranged at the bottom of the pot-type insulator body, and a first cavity adapted to the pot-type insulator body is provided in the base, a gland is provided on the pot-type insulator body, and a bolt is provided on the gland that passes through the through hole and extends to the bottom of the base, and the pot-type insulator body is connected to the base and A sealing ring is provided between the glands and on the side of the bolt close to the axis of the basin insulator body. A second cavity adapted to the basin insulator body is provided in the gland. An inflation device is provided on the base, which is connected to the air inlet ends of the first cavity and the second cavity. The inflation device is used to inject SF gas into the first cavity and the second cavity. A pressurizing device is provided on the base and above the gland. The pressurizing device is used to apply axial force to the gland and the basin insulator body. An ultrasonic flaw detector electrically connected to an external upper machine is provided on the gland and on the periphery of the basin insulator body.

[0012] Preferably, the pressurizing device includes a lifting device and a disc, the lifting device is vertically arranged on the base, and the disc is horizontally arranged on the driving end of the lifting device.

[0013] Preferably, the lifting device includes a stand, a screw, a wheel and a rotating bearing. The stand is arranged on the base, the screw is vertically arranged on the stand and engaged with the stand thread, the wheel is arranged on the screw, and the rotating bearing is arranged on the screw and fixedly connected to the disc.

[0014] Preferably, it also includes a heat preservation cover and a thermo-hygrometer. The heat preservation cover is arranged on the base and located at the periphery of the pressurizing device. The thermo-hygrometer is arranged on the pressurizing device and is electrically connected to an external host computer.

[0015] Preferably, a heating pipe is further included, and the heating pipe is arranged on the inner wall of the heat-insulating cover.

[0016] Preferably, it also includes a cold air fan and a spray device. The cold air fan is arranged on the inner wall of the insulation cover to cool the air in the insulation cover. The spray device is arranged on the inner wall of the insulation cover. The spray device is used to spray the basin-type insulator body, base, gland and bolts and cooperate with the cold air fan to simulate an icing environment.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a test device for testing the fracture failure of GIS pot-type insulators, which has the following beneficial effects:

[0019] 1. The test device for testing GIS pot-type insulator fracture failure introduces SF gas into the first and second cavities through an inflation device to simulate the internal gas environment of the pot-type insulator body under actual working conditions. At the same time, a sealing ring is used to fill the gap between the pot-type insulator body, the base, and the gland to prevent SF gas from leaking from the gaps between the pot-type insulator body, the base, and the gland, thereby affecting the single variable principle of the simulated working environment. The pressure device is then adjusted to drive the gland to apply an axial force to the pot-type insulator body, thereby simulating the pressure effect of the GIS tank weight on the pot-type insulator body under actual working conditions. Finally, an ultrasonic flaw detector is used to detect the fission of the pot-type insulator body 11 in real time and transmit the detection signal to an external host computer for storage, thereby achieving the effect of simply and conveniently simulating the failure and cracking mechanism of the pot-type insulator body using a single control variable.

[0020] 2. The test device for testing the fracture failure of GIS pot-type insulators uses a lifting device to drive the disc in the vertical direction to apply pressure to the cover, and the disc is kept horizontally set to avoid uneven force exerted by the disc on the cover, which causes uneven force exerted by the cover on the pot-type insulator body, thereby affecting the simulated axial force and the stress of the pot-type insulator body in actual working conditions. This causes errors in the failure and cracking mechanism of the pot-type insulator body simulated by the single control variable. By rotating the disc, the disc drives the screw to interact with the stand and lift the disc, thereby applying an axial force to the cover. At the same time, the screw and the disc are connected by a rotating bearing to avoid the screw driving the disc to apply non-axial force to the cover during rotation, thereby affecting the simulated axial force and the stress of the pot-type insulator body in actual working conditions. This causes errors in the failure and cracking mechanism of the pot-type insulator body simulated by the single control variable, further improving the single control variable accuracy of the simulation device and the accuracy of the research structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front cross-sectional view of the structure of a test device for testing the fracture failure of GIS pot-type insulators proposed by the present invention;

[0022] Figure 2 This is a left-side cross-sectional view of the structure of a test device for testing the fracture failure of GIS pot-type insulators proposed by the present invention;

[0023] Figure 3 This is a three-dimensional line diagram of the structure of a test device for testing the fracture failure of GIS pot-type insulators proposed by the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-3A test device for testing GIS pot-type insulator fracture failure includes a pot-type insulator body 11. The main portion of the pot-type insulator body 11 is cast and cured using epoxy resin as a base and alumina as a filler. It is a resin-based composite material. Twelve through-holes 12 are formed on the radial surface of the pot-type insulator body 11. The twelve through-holes 12 are arranged in a circular array on the pot-type insulator body 11 with the centerline of the pot-type insulator body 11 as the axis. Each of the twelve through-holes 12 is embedded with a threaded sleeve with a diameter of 16 mm. The threaded sleeve is made of steel. The upper and lower portions of the through-holes 12 that are not embedded with the threaded sleeve are 8 mm thick.The height of 5mm corresponds to an aperture of 18mm, and further includes a base 2, which is arranged at the bottom of the pot insulator body 11. A first cavity 3 adapted to the pot insulator body 11 is opened in the base 2. A gland 4 is movably mounted on the pot insulator body 11, and a bolt 5 is movably mounted on the gland 4, which passes through the through hole 12 and extends to the bottom of the base 2. A sealing ring 6 is movably mounted between the pot insulator body 11, the base 2 and the gland 4, and on the side of the bolt 5 close to the axis of the pot insulator body 11. After the pot insulator body 11, the base 2 and the gland 4 are tightly bolted together by the M16 bolt 5, the corresponding through hole 12 is movably mounted on the gland 4. A certain amount of pores will be reserved in the hole 12. When the rainproof cap and other rainproof devices on the M16 bolt 5 fail, moisture will flow in through the pores. A second cavity 7 adapted to the basin-type insulator body 11 is provided in the gland 4. The base 2 is fixedly mounted with an inlet end connected to the first cavity 3 and the second cavity 7. An inlet device 8 is connected. The inlet device 8 is used to inject SF6 gas into the first cavity 3 and the second cavity 7. The inlet device 8 includes an SF6 gas tank, a control valve and a gas delivery steel pipe. The SF6 gas tank is fixedly mounted on the base 2. The exhaust end of the SF6 gas tank is provided with a control valve. The exhaust end of the control valve is provided with two inlet ports connected to the first cavity 3 and the second cavity 7. A gas delivery steel pipe is connected to the air inlet end of the first cavity 3 and the second cavity 7. A pressurizing device 9 is fixedly installed on the base 2 and above the gland 4. The pressurizing device 9 is used to apply axial force to the gland 4 and the pot insulator body 11. An ultrasonic flaw detector 17 electrically connected to an external upper machine is provided on the gland 4 and on the periphery of the pot insulator body 11. SF6 gas is introduced into the first cavity 3 and the second cavity 7 through the inflation device 8 to simulate the internal gas environment of the pot insulator body 11 in actual working conditions. At the same time, the gap between the pot insulator body 11 and the base 2 and the gland 4 is filled through the sealing ring 6 to avoid The simulation follows the principle of a single variable, where SF6 gas leaks through the gaps between the basin insulator body 11, the base 2, and the gland 4, affecting the simulated working environment. Adjusting the pressurizing device 9 drives the gland 4 to apply an axial force to the basin insulator body 11, thereby simulating the pressure exerted by the weight of the GIS tank atop the basin insulator body 11 under actual working conditions. Finally, an ultrasonic flaw detector 17 detects the fission of the basin insulator body 11 in real time, transmitting the detection signal to an external host computer for storage. This achieves the simple and convenient single-control variable simulation of the failure and cracking mechanism of the basin insulator body 11.

[0026] Preferably, the pressurizing device 9 includes a lifting device 91 and a disc 92, the lifting device 91 is fixedly installed on the base 2 in the vertical direction, and the disc 92 is fixedly installed on the driving end of the lifting device 91 along the horizontal plane; the lifting device 91 drives the disc 92 in the vertical direction to apply pressure to the pressure cover 4, and the disc 92 remains horizontally set to avoid uneven force applied by the disc 92 on the pressure cover 4, resulting in uneven force applied by the pressure cover 4 on the pot insulator body 11, which affects the simulated axial force and the stress of the pot insulator body 11 in the actual working condition. The stress is different, resulting in an error in the failure and cracking mechanism of the pot insulator body 11 simulated by the single control variable.

[0027] Preferably, the lifting device 91 includes a stand 911, a screw 912, a wheel 913 and a rotating bearing 914, the stand 911 is fixedly mounted on the base 2, the screw 912 is vertically movably mounted on the stand 911 and is threadedly engaged with the stand 911, the wheel 913 is fixedly mounted on the screw 912, and the rotating bearing 914 is fixedly mounted on the bottom of the screw 912 and is fixedly connected to the disc 92; by rotating the wheel 913, the wheel 913 drives the screw 912 to interact with the stand 911 and causes the disc 92 to rise and fall, thereby applying an axial force to the pressure cover 4, and at the same time, the screw 912 and the disc 92 are connected by the rotating bearing 914 to avoid the screw 912 driving the disc 92 to apply non-axial force to the pressure cover 4 during rotation, thereby affecting the simulated axial force and the stress of the pot-type insulator body 11 in actual working conditions. The stress is different, resulting in an error in the failure and cracking mechanism of the pot-type insulator body 11 simulated by the single control variable.

[0028] Preferably, it also includes a thermal insulation cover 10 and a thermometer and hygrometer 16. The thermal insulation cover 10 is fixedly installed on the base 2 and is located on the periphery of the pressure device 9. The thermometer and hygrometer 16 is fixedly installed on the pressure device 9 and is electrically connected to the external host computer. The model of the thermometer and hygrometer 16 is RS485 / 4-20mA. The thermal insulation cover 10 is used to isolate the test device for testing the GIS pot-type insulator fracture failure from the external environment to avoid the external environmental temperature change affecting the single control variable to simulate the failure and cracking mechanism of the pot-type insulator body 11, and the occurrence of errors. At the same time, the thermometer and hygrometer 16 is used to monitor the temperature and humidity changes inside the thermal insulation cover 10 in real time and transmit the detection signal to the external host computer for real-time recording, to avoid the occurrence of non-single variables in the simulation device affecting the failure and cracking mechanism of the pot-type insulator body 11.

[0029] Preferably, it also includes a heating tube 13, which is fixedly installed on the inner wall of the thermal insulation cover 10; the ambient temperature inside the thermal insulation cover 10 is controlled by the heating tube 13, so that the test device for testing the fracture failure of the GIS pot-type insulator can simulate the influence of high temperature weather on the failure and cracking mechanism of the pot-type insulator body 11 by regulating the temperature.

[0030] Preferably, it also includes a cooling fan 14 and a spray device 15. The cooling fan 14 is fixedly mounted on the inner wall of the heat preservation cover 10 to cool the air in the heat preservation cover 10. The spray device 15 is fixedly mounted on the inner wall of the heat preservation cover 10. The spray device 15 is used to spray the pot-type insulator body 11, the base 2, the gland 4 and the bolt 5 and cooperate with the cooling fan 14 to simulate the icing environment. The spray device 15 sprays the pot-type insulator body 11, the base 2, the gland 4 and the bolt 5 with different water pressures and water flows, thereby simulating different rainfall weather conditions to cause the pot-type insulator body 11 to fail and crack. The influence of the system is simulated. At the same time, the internal ambient temperature of the thermal insulation cover 10 is cooled by the cold air fan 14, so that the moisture on the basin insulator body 11, the base 2, the gland 4 and the bolt 5 freezes. If the rainproof devices such as the rain cap of the M16 bolt 5 fail, it is bound to cause water to seep into the pores of the through holes 12 on the basin insulator body 11. Under low temperature conditions, the freezing expansion of the pore water and the cold contraction of the basin insulator are bound to cause the corresponding holes to be subjected to a large freezing expansion force, thereby causing excessive local stress and the risk of failure, thereby simulating the influence of the ice environment on the failure and cracking mechanism of the basin insulator body 11.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A test device for testing the fracture failure of a GIS pot-type insulator, comprising a pot-type insulator body (11), a through hole (12) being formed on a radial surface of the pot-type insulator body (11), and characterized in that: The invention also includes a base (2), which is arranged at the bottom of the basin-type insulator body (11), a first cavity (3) adapted to the basin-type insulator body (11) is provided in the base (2), a pressure cover (4) is provided on the basin-type insulator body (11), a bolt (5) penetrating a through hole (12) and extending to the bottom of the base (2) is provided on the pressure cover (4), a sealing ring (6) is provided between the basin-type insulator body (11), the base (2) and the pressure cover (4) and on a side of the bolt (5) close to the axis of the basin-type insulator body (11), and a sealing ring (6) is provided in the pressure cover (4) adapted to the basin-type insulator body (11). (11) a second cavity (7) adapted thereto, a gas filling device (8) is provided on the base (2) and is connected to the gas inlet ends of the first cavity (3) and the second cavity (7), the gas filling device (8) is used to inject SF6 gas into the first cavity (3) and the second cavity (7), a pressurizing device (9) is provided on the base (2) and is located above the gland (4), the pressurizing device (9) is used to apply an axial force to the gland (4) and the basin-type insulator body (11), an ultrasonic flaw detector (17) electrically connected to an external upper machine is provided on the gland (4) and is located on the periphery of the basin-type insulator body (11); The pressurizing device (9) comprises a lifting device (91) and a disc (92), wherein the lifting device (91) is vertically arranged on the base (2), and the disc (92) is horizontally arranged on the driving end of the lifting device (91); The lifting device (91) includes a stand (911), a screw (912), a wheel (913) and a rotary bearing (914), wherein the stand (911) is arranged on the base (2), the screw (912) is vertically arranged on the stand (911) and is threadedly engaged with the stand (911), the wheel (913) is arranged on the screw (912), and the rotary bearing (914) is arranged on the screw (912) and is fixedly connected to the disc (92); It also includes a heat preservation cover (10) and a thermo-hygrometer (16), wherein the heat preservation cover (10) is arranged on the base (2) and is located outside the pressurizing device (9), and the thermo-hygrometer (16) is arranged on the pressurizing device (9) and is electrically connected to an external upper machine; It also includes a heating pipe (13), which is arranged on the inner wall of the heat-insulating cover (10).

2. The test device for testing GIS pot-type insulator fracture failure according to claim 1, characterized in that: The invention also includes a cooling fan (14) and a spraying device (15). The cooling fan (14) is arranged on the inner wall of the heat-insulating cover (10) for cooling the air in the heat-insulating cover (10). The spraying device (15) is arranged on the inner wall of the heat-insulating cover (10). The spraying device (15) is used to spray the basin-type insulator body (11), the base (2), the gland (4) and the bolts (5) and cooperate with the cooling fan (14) to simulate an icing environment.

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