An AC / DC GIS / GIL multi-operating condition equivalent assessment test system and method

Abstract

The present invention discloses an AC / DC GIS / GIL multi-operating condition equivalent assessment test system and method, the system includes a gas-insulated bushing, a corner unit and several test chambers; the several test chambers are sequentially connected into a loop through the corner unit, the gas-insulated bushing is connected to one of the corner units, and the connection part between the test chamber and the corner unit and the connection part between the gas-insulated bushing and the corner unit are both provided with tooling pot-type insulators; the test chamber includes an assessment test chamber and an expandable assessment test chamber, wherein the number of the assessment test chambers is at least one; the outside of the assessment test chamber shell is provided with an induction current riser capable of applying current to the central conductor of the assessment test chamber. The present invention can improve the assessment capability of the insulator in multiple operating conditions, multiple factors, and approximately equivalent to the actual operating conditions while meeting the objective test capacity permission conditions, discover micro-defect problems in the structural design and process manufacturing of the insulator that could not be detected by previous type tests, and ensure the safe and stable operation of the insulator.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment structure design, test and equivalent assessment, and in particular relates to an AC / DC GIS / GIL multi-operating condition equivalent assessment test system and method. Background Art

[0002] Insulators are key components of UHV gas insulated switchgear (GIS) and transmission lines (GIL). They support conductors and provide electrical insulation. The mechanical strength, insulation performance, and thermal performance of insulators are related to the safety and stability of system operation. However, in operation, they are subject to impact voltages such as lightning and operation, as well as mechanical stresses caused by short-circuit electromotive force and vibration. The working conditions are complex and the coupling effects of electric-thermal-mechanical multi-physics fields are diverse. In addition, since the central conductive rod carries current, a temperature gradient will be generated inside the insulator and in the operating environment. As the operating environment and current carrying capacity change, the temperature gradient inside the insulator will also change. The overall temperature field distribution of the insulator is seriously affected by the current carrying capacity and the operating environment, which will cause the conductive rod to produce thermal expansion, thereby causing uncontrollable forces on the insulator in the axial direction. Although AC / DC GIS / GIL has a complete type test and assessment system, many surface flashover or explosion faults still occur in GIS / GIL insulators during operation. Under long-term operation, faults such as debonding and discharge of the metal-epoxy bonding interface of the insulator often occur. The current type test that assesses insulators through a single variable, that is, the separate electrical, thermal, and mechanical assessment methods, cannot effectively find out structural and process weaknesses such as unreasonable structural design, poor manufacturing process, and poor external force resistance. It cannot effectively simulate the actual operating conditions of GIS / GIL. Considering the AC / DC GIS / GIL equivalent assessment test system under multiple working conditions and multiple factors, it is urgent to improve.

[0003] AC / DC GIS / GIL insulation is mainly subjected to electrical-thermal-mechanical coupling conditions. The electrical aspects are mainly rated, impact, and operation, the mechanical aspects mainly include vibration and pressure, and the thermal aspects mainly include temperature gradient. Existing test assessments are mainly carried out from a single factor, that is, the electrical assessment, thermal assessment, and mechanical assessment are carried out separately, without coupling and superposition. For the equivalent assessment of the actual working conditions of power equipment, it is necessary to take into account electrical-thermal-mechanical, and apply high voltage, large current, and strong vibration to the equipment at the same time. On the other hand, if the existing assessment test device considers both voltage and current factors at the same time, it is directly connected to the assessment test power supply, which will require the test power supply to have the ability to load large current and high voltage at the same time. For the assessment of ultra-high voltage and ultra-high voltage equipment, the existing power supply cannot meet the requirements, and the output power of ordinary power grids is also difficult to meet the power supply requirements of such power supplies. Therefore, designing a new AC / DC GIS / GIL equivalent assessment test system to improve the equivalent assessment level of insulator performance under multiple working conditions and multiple factors is of great significance to solving the problem that the current GIS / GIL type test assessment has a single influencing factor and cannot effectively discover design and manufacturing defects such as insulation structure and process, and avoid serious discharge failures of insulators during operation. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to propose an AC / DC GIS / GIL multi-condition equivalent assessment test system and method, so as to improve the multi-condition, multi-factor assessment capability of the insulator that is approximately equivalent to the actual operating conditions while meeting the objective test capacity permission conditions, discover the micro-defects in the insulator structural design and process manufacturing that could not be detected by previous type tests, and ensure the safe and stable operation of the insulator.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] An AC / DC GIS / GIL multi-operating condition equivalent assessment test system comprises a gas-insulated bushing, a corner unit and a plurality of test chambers; the plurality of test chambers are sequentially connected into a loop through the corner unit, the gas-insulated bushing is connected with one of the corner units, and the connection between the test chamber and the corner unit and the connection between the gas-insulated bushing and the corner unit are both provided with tooling pot-type insulators; the test chamber comprises an assessment test chamber and an expandable assessment test chamber, wherein the number of the assessment test chambers is at least one; when the number of the assessment test chambers is one, the number of the expandable assessment test chambers is greater than or equal to 1; when the number of the assessment test chambers is more than two, the number of the expandable assessment test chambers is greater than or equal to 0;

[0007] The test chamber includes a test chamber shell and a test chamber center conductor arranged at the axis of the test chamber shell. At least one insulator to be tested is sleeved on the center conductor of the test chamber. When more than two insulators to be tested are arranged, all the insulators to be tested are arranged at intervals. A simulation shell is arranged on the coaxial cover of each insulator to be tested. An insulator force adjustment device capable of exerting a force on the insulator to be tested is arranged between the test chamber shell and each simulation shell.

[0008] An inductive current booster capable of applying current to the central conductor of the test chamber is provided outside the test chamber shell;

[0009] The expandable assessment test chamber includes an expandable assessment test chamber shell and an expandable assessment test chamber center conductor arranged at the axis of the expandable assessment test chamber shell.

[0010] Preferably, the simulation shell is cylindrical with flanges at both ends.

[0011] Preferably, the insulator force adjustment device comprises a plurality of adjustment units, which are arranged between the lower side of the simulation shell and the shell of the test chamber, and the plurality of adjustment units form at least three-point support surfaces for the simulation shell, wherein:

[0012] Each adjusting unit includes an adjusting screw, a support rod, a first base, a second base and a nut sleeve. The first base is connected to the simulation shell, the upper end of the support rod is axially connected to the first base, the lower end of the support rod is axially connected to the side wall of the nut sleeve, the second base is connected to the assessment test chamber shell, the lower end of the adjusting screw is connected to the second base and the adjusting screw can rotate around the axis of the adjusting screw, the nut sleeve is sleeved on the adjusting screw and is threadedly connected to the adjusting screw; a ball joint connection or an axial connection is adopted between the adjusting screw and the second base. When an axial connection is adopted, the adjusting screw includes a connecting head and a screw section. The connecting head is axially connected to the second base, and the lower end of the screw section is rotatably connected to the connecting head.

[0013] Preferably, a piezoelectric ceramic exciter for applying vibration to the simulation shell is provided between the first base and the simulation shell.

[0014] Preferably, the inner hole of the insulator under test is sleeved outside the central conductor of the test chamber, and the outer edge of the insulator under test is connected to the inner surface of the simulated shell.

[0015] Preferably, a plug-in contact is arranged at the center of the tooling pot-type insulator, and the central conductor of the assessment test chamber is connected to the central conductor of the corner unit through the plug-in contact, and the central conductor of the assessment test chamber can be extended to be connected to the central conductor of the corner unit through the plug-in contact.

[0016] Preferably, a discharge sensor sensing point is installed at the end of each assessment test chamber.

[0017] Preferably, the insulation strength of the tooling pot-type insulator is at least 1.2 times the insulation strength of the insulator being tested.

[0018] Preferably, the shell of the assessment test chamber adopts at least one of a cylindrical shell and a spherical shell; the shape of the loop formed by connecting several test chambers in sequence through corner units is rectangular or polygonal; the gas insulating bushing is located above the plane where the loop formed by connecting all the test chambers is located.

[0019] The working method of the AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention comprises the following process:

[0020] Introduce voltage into the central conductor of the test chamber through the gas-insulated bushing and the corner unit;

[0021] The inductive current booster loads current to the central conductor of the test chamber;

[0022] The insulator force adjustment device applies a preset force to the insulator under test through a simulated shell;

[0023] The insulator to be tested is tested under the voltage, current and preset force.

[0024] The AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention can realize the overall low-power flow of the assessment device through the loop formed by connecting the induction current riser and several test chambers in sequence through the corner unit, and the output power of the ordinary power grid can also meet the power supply power requirement; the voltage can be introduced into each center conductor (such as the center conductor of the corner unit, the center conductor of the assessment test chamber, and the center conductor of the expandable assessment test chamber) through the gas insulation bushing, so that the AC / DC GIS / GIL multi-operating condition equivalent assessment test system can realize live assessment. The insulator force adjustment device can independently apply the stress under different working conditions to the insulator under assessment, which has no influence on the voltage and current, and realizes the maximum equivalent simulation of the electric-thermal-mechanical multi-physical field coupling of the operating condition of the insulator under assessment; the insulator force adjustment device can also adjust the eccentricity of the center conductor of the assessment test chamber and the axis of the simulation shell, so as to realize the equivalent assessment of insulators with different electric field uniformity and different conductor structure designs, and ensure the flexibility of the test device. The use of tooling basin insulators can separate each test chamber into an independent air chamber. At the same time, the test chamber includes an expandable test chamber in addition to the test chamber. The use of the expandable test chamber enhances the flexibility and expandability of the test device, and facilitates the partial disassembly and inspection of the test system. In summary, the present invention can load voltage and current on the insulator under test at the same time, realizing electrical and thermal equivalent tests; and the current and voltage are loaded independently and do not affect each other, which ensures the safety and reliability of the test equipment, and effectively reduces the power required by the current and voltage equivalent test equipment of the test system, ensuring the economy of the test test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the AC / DC GIS / GIL multi-operating condition equivalent assessment test system in an embodiment of the present invention.

[0026] Figure 2 for Figure 1 Rear view of.

[0027] Figure 3 The figure is a layout diagram of the assessment test cabin in the embodiment of the present invention.

[0028] Figure 4 This is an insulator force adjustment device in an embodiment of the present invention.

[0029] In the figure, 1 is a gas-insulated bushing, 2 is a first assessment test chamber, 3 is a second assessment test chamber, 4 is a first expandable assessment test chamber, 5 is a second expandable assessment test chamber, 6 is an inductive current riser, 7 is a discharge sensor measuring point, 8 is an insulator under assessment, 9 is a simulated shell, 9-1 is a flange, 10 is a center conductor of the assessment test chamber, 11 is an adjustment unit, 11-1 is an adjustment screw, 11-2 is a support rod, 11-3-1 is a first base, 11-3-2 is a second base, 11-4 is a nut sleeve, 12 is a tooling pot-type insulator, 13 is a plug-in contact, 14-1 is an L-type corner unit, 14-2 is a T-type corner unit, 15 is a bracket, 16 is a grounding wire, and 17 is an assessment test chamber shell. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] See also Figure 1-Figure 3The AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention comprises a gas-insulated bushing 1, a corner unit and a plurality of test chambers; the plurality of test chambers are sequentially connected into a loop through the corner unit, the gas-insulated bushing 1 is connected with one of the corner units, and the connection between the test chamber and the corner unit and the connection between the gas-insulated bushing 1 and the corner unit are both provided with a tooling pot-type insulator 12; the test chamber comprises an assessment test chamber and an expandable assessment test chamber, wherein the number of the assessment test chambers is at least one; when the number of the assessment test chambers is one, at least one expandable assessment test chamber is also required in the present invention. The test cabin is connected to form the above-mentioned loop. In this case, the number of expandable test cabins should be greater than or equal to 1; when the number of test cabins is more than two, the expandable test cabin may not be used in the present invention, and the test cabin and the corner unit may be connected to form the above-mentioned loop, or an expandable test cabin may be connected to the loop according to specific needs. In this case, the number of expandable test cabins is greater than or equal to 0; the test cabin includes an test cabin shell, a test cabin center conductor arranged at the axis of the test cabin shell, a simulation shell 9 coaxially sleeved on the outside of the test cabin center conductor, and a test cabin shell provided at the test cabin. The insulator 8 to be tested between the central conductor of the nuclear test chamber and the simulation shell 9, and the insulator force adjustment device arranged between the simulation shell 9 and the shell of the test chamber and capable of applying force to the insulator 8 to be tested, the insulator force adjustment device is preferably arranged directly below the simulation shell 9 during installation, which is conducive to ensuring that the stress state of the simulation shell 9 and the insulator force adjustment device is relatively stable and convenient for the operation of the insulator force adjustment device; the specific installation form of the insulator 8 to be tested is as follows: the inner hole of the insulator 8 to be tested is sleeved on the outside of the central conductor of the test chamber, and the outer edge of the insulator 8 to be tested is connected to the outer edge of the insulator 8 to be tested. The inner surface of the simulation shell 9 is connected; at least one insulator 8 to be tested is arranged on the central conductor of the test chamber; when more than two insulators 8 to be tested are arranged, all the insulators 8 to be tested are arranged at intervals; each insulator 8 to be tested is correspondingly provided with a simulation shell 9 outside the central conductor of the test chamber and the insulator force adjustment device; an induction current booster 6 capable of applying current to the central conductor of the test chamber is provided outside the test chamber shell; the expandable test chamber includes an expandable test chamber shell and an expandable test chamber central conductor arranged at the axis of the expandable test chamber shell.

[0032] It can be seen from the structures of the assessment test cabin and the expandable assessment test cabin of the present invention that the structure of the assessment test cabin is based on the structure of the expandable assessment test cabin, and the insulator 8, the simulated shell 9 and the insulator force adjustment device are installed in the expandable assessment test cabin, so that the structure of the expandable assessment test cabin can be transformed into the assessment test cabin, and the insulator 8, the simulated shell 9 and the insulator force adjustment device in the assessment test cabin can be removed, so that the structure of the assessment test cabin can be transformed into the expandable assessment test cabin. It can be seen that the structures of the assessment test cabin and the expandable assessment test cabin of the present invention can be converted into each other.

[0033] When the above-mentioned AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention is working, a voltage is introduced into the central conductor of the assessment test cabin through the gas insulation bushing 1 and the corner unit. The voltage introduced by the gas insulation bushing 1 will be transmitted to the central conductor of the assessment test cabin of each assessment test cabin, the central conductor of the expandable assessment test cabin of each expandable assessment test cabin and the central conductor of each corner unit; current is loaded to the central conductor of the assessment test cabin through the induction current booster 6; the insulator force adjustment device applies a preset force to the insulator 8 to be assessed through the simulation shell 9. The preset force can be flexibly loaded according to the requirements of the experiment, and the present invention does not make specific limitations; the insulator 8 to be assessed is assessed under the voltage, current and preset force.

[0034] See also Figure 3 The simulated shell 9 of the present invention is cylindrical, and has flanges 9 - 1 at both ends. The flanges 9 - 1 can evenly simulate the electric field at the ends of the shell 9 to avoid discharge at the ends of the simulated shell 9 .

[0035] See also Figure 3 The simulation shell 9 of the present invention can be connected to the shell of the assessment test chamber through a grounding wire 16. When the AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention is working, the shell of the assessment test chamber is grounded, thereby realizing the grounding of the simulation shell 9.

[0036] See also Figure 4 The insulator force adjustment device includes a plurality of adjustment units 11, which are arranged between the lower side of the simulation housing 9 and the test chamber housing 17. The plurality of adjustment units 11 form at least three support surfaces for the simulation housing 9. Generally, three or four adjustment units 11 can be arranged. When there are three adjustment units 11, Figure 3 Take the orientation shown as an example, looking down Figure 3 When there are four adjustment units 11, the three adjustment units 11 support the simulation shell 9 at three points, and the three support points form an isosceles triangle, one of which is located directly below the axis of the simulation shell 9, and the other two support points are located on both sides of the axis of the simulation shell 9; when there are four adjustment units 11, Figure 3 Take the orientation shown as an example, looking down Figure 3 When the four adjustment units 11 support the simulation shell 9 at four points, the four support points form a rectangle, and the rectangle takes the axis of the simulation shell 9 as the axis of symmetry. Of course, the arrangement of the adjustment units 11 of the present invention is not limited to the above two forms. Its main function and purpose is to support the simulation shell 9 and adjust the orientation of the simulation shell 9. Those skilled in the art can also flexibly arrange the form of the adjustment units 11 according to actual needs, and the present invention does not make specific limitations.

[0037] Each adjusting unit 11 of the present invention comprises an adjusting screw 11-1, a support rod 11-2, a first base 11-3-1, a second base 11-3-2 and a nut sleeve 11-4, the first base 11-3-1 is connected to the simulation shell 9, the connection point between the first base 11-3-1 and the simulation shell 9 serves as the above-mentioned supporting point, the upper end of the support rod 11-2 is axially connected to the first base 11-3-1, so that Figure 4 Taking the shown orientation as an example, the support rod 11-2 can swing parallel to the paper surface, the lower end of the support rod 11-2 is connected to the side wall axis of the nut sleeve 11-4, the nut sleeve 11-4 can swing parallel to the paper surface, the second base 11-3-2 is connected to the assessment test chamber shell 17, the lower end of the adjusting screw 11-1 is connected to the second base 11-3-2 and the adjusting screw 11-1 can rotate around the axis of the adjusting screw 11-1, the nut sleeve 11-4 is sleeved on the adjusting screw 11-1 and is threadedly connected to the adjusting screw 11-1; the adjusting screw 11-1 and the second base 11-3-2 are connected by a ball joint or an axial connection. When an axial connection is adopted, the adjusting screw 11-1 includes a connecting head and a screw segment. The connecting head is connected to the second base 11-3-2 axis, the connecting head can swing parallel to the paper surface, and the lower end of the screw segment is rotatably connected to the connecting head. When the adjusting unit 11 of the present invention is in use, the position of the nut sleeve 11-4 on the adjusting screw 11-1 can be adjusted by rotating the adjusting screw 11-1 to rotate, thereby adjusting the position of the lower support point of the support rod 11-2. The support rod 11-2 will apply a force to the simulated shell 9 through the first base 11-3-1. By adjusting several adjusting units 11, the spatial orientation of the simulated shell 9 can be adjusted, thereby applying different forms of force to the insulator 8 under test to simulate different stress conditions of the insulator 8 under test.

[0038] A piezoelectric ceramic exciter for applying vibration to the simulated shell 9 is provided between the first base 11-3-1 and the simulated shell 9. The piezoelectric ceramic exciter can apply vibration excitation to the simulated shell 9, and the simulated shell 9 transmits the vibration excitation to the insulator 8 under test, thereby simulating the vibration condition during the operation of GIS / GIL.

[0039] See also Figure 3 The center of the tooling pot-type insulator 12 of the present invention is provided with a plug-in contact 13, and the center conductor of the test chamber is connected with the center conductor of the corner unit through the plug-in contact 13.

[0040] The center conductor of the expandable assessment test chamber is connected to the center conductor of the corner unit through a plug-in contact 13. Each center conductor (such as the center conductor of the corner unit, the center conductor of the assessment test chamber, and the center conductor of the expandable assessment test chamber) can be conveniently assembled and connected through the plug-in contact 13, thereby enhancing the scalability of the present invention.

[0041] See also Figure 1 , a discharge sensor measuring point 7 is installed at the end of each assessment test chamber, and the discharge sensor measuring point 7 can adopt a fluorescent optical fiber photosensitive device. By setting the discharge sensor measuring point 7, the present invention can effectively detect the test section where the insulator with problems is located, and effectively avoid blindly opening the tank to check the location of the problem insulator, resulting in a waste of time and labor costs.

[0042] In the present invention, the insulation strength of the tooling pot-type insulator 12 is at least 1.2 times that of the insulator 8 being tested, ensuring that during the equivalent test, the tooling pot-type insulator 12 will not experience surface flashover or other discharges, thereby affecting the equivalent test of the insulator 8 being tested.

[0043] In the present invention, the shell of the assessment test chamber is at least one of a cylindrical shape and a spherical shape; the shape of a loop formed by connecting several test chambers in sequence through corner units is rectangular or polygonal, and the shape of the loop can be flexible and changeable according to actual needs; the gas insulating bushing 1 is located above the plane where the loop formed by connecting all the test chambers is located, and the gas insulating bushing 1 can be set vertically or inclined at a certain angle, but it is necessary to ensure that the insulation level of the gas insulating bushing 1 to the ground is greater than the insulation strength of the tooling pot-type insulator 12.

[0044] See also Figure 2 Each test chamber of the present invention is installed on the bracket 15, so that a safe distance is maintained between the entire assessment test system and the foundation (such as the ground).

[0045] Example

[0046] like Figure 1-Figure 3As shown, the AC / DC GIS / GIL multi-condition equivalent assessment test system of this embodiment includes a gas-insulated bushing 1, a first assessment test chamber 2, a second assessment test chamber 3, a first expandable assessment test chamber 4, and a second expandable assessment test chamber 5; the gas-insulated bushing 1 is vertically arranged, the shell of the first assessment test chamber 2 is cylindrical, the shell of the second assessment test chamber 3 is spherical, the first assessment test chamber 2, the second assessment test chamber 3, the first expandable assessment test chamber 4, and the second expandable assessment test chamber 5 are connected into a circular (or rectangular) loop through a corner unit. Specifically, the first assessment test chamber 2 is connected to the second expandable assessment test chamber 5 through an L-shaped corner unit 14-1, the second expandable assessment test chamber 5 is connected to the second assessment test chamber 3 through an L-shaped corner unit 14-1, the second assessment test chamber 3 is connected to the first expandable assessment test chamber 4 through an L-shaped corner unit 14-1, the first expandable assessment test chamber 4 and the first assessment test chamber 2 are respectively connected to the two ends of a T-shaped corner unit 14-2, and the gas insulation bushing 1 is connected to the other end of the T-shaped corner unit 14-2 through an air chamber. The central conductors of the first assessment test chamber 2, the second assessment test chamber 3, the first expandable assessment test chamber 4, and the second expandable assessment test chamber 5 are respectively connected to the central conductors of the corner units connected to them (such as the L-shaped corner unit 14-1 and the T-shaped corner unit 14-2) through plug-in contacts 13, and the shell of the test chamber is connected to the shell of the corner unit through a butt flange surface. The above-mentioned docking positions are divided into air chambers by tooling pot insulators 12.

[0047] In this embodiment, the positions of the first assessment test chamber 2 and the second assessment test chamber 3 can be interchanged at will, and the first expandable assessment test chamber 4 and the second expandable assessment test chamber 5 can be expanded to the structure of the first assessment test chamber 2 or the second assessment test chamber 3. Multiple groups of the test sample units to be assessed are arranged in the first assessment test chamber 2 and the second assessment test chamber 3, and the insulator force adjustment device is arranged directly below the simulation shell 9, and flanges 9-1 are arranged at both ends of the simulation shell 9. The insulator force adjustment device of this embodiment adopts the structure as described above, wherein the adjusting screw 11-1 and the second base 11-3-2 are connected by a ball joint.

[0048] The insulator force adjustment device of the present invention can apply forces such as vibration to the insulator 8 to be tested through the simulated shell 9; at the same time, the relative position of the two axes between the simulated shell 9 and the central conductor 10 of the test chamber can also be adjusted.

[0049] An induction current booster 6 is provided outside the first test chamber 2 or / and the second test chamber 3, which can form a large current in the loop composed of the first test chamber 2, the second test chamber 3, the first expandable test chamber 4, and the second expandable test chamber 5 by electromagnetic induction. The insulation strength of the tooling pot-type insulator 12 in this embodiment is 1.2 times the insulation strength of the insulator 8 being tested.

[0050] From the above, it can be seen that the AC / DC GIS / GIL multi-operating condition equivalent assessment test system of the present invention realizes the overall low-power flow of the assessment device through the induction current booster and the tooling arranged in a loop shape; at the same time, the voltage is introduced to the central conductor through the gas-insulated bushing, so that the AC / DC GIS / GIL multi-operating condition equivalent assessment test system can realize live assessment. The present invention can load voltage and current on the insulator under assessment at the same time, realizing electrical and thermal equivalent assessment; and the current and voltage are loaded independently and do not affect each other, which ensures the safety and reliability of the test equipment, and at the same time effectively reduces the power supply power required by the current and voltage equivalent assessment equipment of the test system, ensuring the economy of the test assessment.

[0051] The present invention provides an insulator force adjustment device, which can independently apply stress under different working conditions to the insulator under test, without affecting the voltage and current, thereby realizing the maximum equivalent simulation of the electric-thermal-mechanical multi-physical field coupling of the operating condition of the insulator under test, and ensuring the safety and reliability of the test device; the eccentricity between the central conductor of the test chamber and the axis of the simulated shell can also be adjusted through the insulator under test, so as to realize the equivalent test of insulators with different electric field uniformity and different conductor structure design, thereby ensuring the flexibility of the test device.

[0052] By forming a tested unit consisting of an insulator under test, a simulated shell and a central conductor of an test chamber, it is possible to simultaneously test multiple groups of test specimens in a single test chamber without affecting each other, and to simultaneously test specimens in different test chambers without affecting each other.

[0053] The use of tooling basins to separate air chambers and expandable units enhances the flexibility and expandability of the test device, and facilitates partial disassembly and inspection of the test system. The circular test chamber can use a large space to install sensor devices, which can be replaced with the linear test chamber to facilitate equivalent testing of insulators of different configurations and required spaces, and maximize the use of test space.

Claims

1. An AC / DC GIS / GIL multi-operating condition equivalent assessment test system, characterized in that: The invention comprises a gas-insulated bushing (1), a corner unit and a plurality of test chambers; the plurality of test chambers are sequentially connected to form a loop through the corner units, the gas-insulated bushing (1) is connected to one of the corner units, and the connection between the test chamber and the corner unit and the connection between the gas-insulated bushing (1) and the corner unit are both provided with tooling pot-type insulators (12); the test chamber comprises an assessment test chamber and an expandable assessment test chamber, wherein the number of the assessment test chambers is at least one; when the number of the assessment test chambers is one, the number of the expandable assessment test chambers is greater than or equal to 1; when the number of the assessment test chambers is more than two, the number of the expandable assessment test chambers is greater than or equal to 0; The test chamber comprises a test chamber shell and a test chamber center conductor arranged at the axis of the test chamber shell. At least one insulator (8) to be tested is sleeved on the center conductor of the test chamber. When more than two insulators (8) to be tested are arranged, all the insulators (8) to be tested are arranged at intervals. A simulation shell (9) is arranged on the outer coaxial cover of each insulator (8) to be tested. An insulator force adjustment device capable of applying a force to the insulator (8) to be tested is arranged between the test chamber shell and each simulation shell (9). An inductive current booster (6) capable of applying current to the central conductor of the test chamber is provided outside the test chamber shell; The expandable assessment test chamber includes an expandable assessment test chamber shell and an expandable assessment test chamber center conductor arranged at the axis of the expandable assessment test chamber shell.

2. According to claim 1, an AC / DC GIS / GIL multi-operating condition equivalent assessment test system is characterized in that: The simulation shell (9) is cylindrical and has flanges (9-1) at both ends.

3. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: The insulator force adjustment device comprises a plurality of adjustment units (11), the plurality of adjustment units (11) being arranged between the lower side of the simulation housing (9) and the assessment test chamber housing (17), the plurality of adjustment units (11) forming at least three-point support surfaces for the simulation housing (9), wherein: Each adjustment unit (11) comprises an adjustment screw (11-1), a support rod (11-2), a first base (11-3-1), a second base (11-3-2) and a nut sleeve (11-4); the first base (11-3-1) is connected to the simulation shell (9); the upper end of the support rod (11-2) is axially connected to the first base (11-3-1); the lower end of the support rod (11-2) is axially connected to the side wall of the nut sleeve (11-4); the second base (11-3-2) is connected to the test chamber shell (17); the adjustment screw (11-1) The lower end of the adjusting screw (11-1) is connected to the second base (11-3-2) and the adjusting screw (11-1) can rotate around the axis of the adjusting screw (11-1); the nut sleeve (11-4) is sleeved on the adjusting screw (11-1) and is threadedly connected to the adjusting screw (11-1); the adjusting screw (11-1) and the second base (11-3-2) are connected by a ball joint or an axis; when the axis is connected, the adjusting screw (11-1) comprises a connecting head and a screw segment; the connecting head is connected to the axis of the second base (11-3-2), and the lower end of the screw segment is rotatably connected to the connecting head.

4. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 3 is characterized in that: A piezoelectric ceramic exciter for applying vibration to the simulation shell (9) is provided between the first base (11-3-1) and the simulation shell (9).

5. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: The inner hole of the insulator (8) under test is sleeved outside the central conductor of the test chamber, and the outer edge of the insulator (8) under test is connected to the inner surface of the simulation shell (9).

6. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: A plug contact (13) is arranged at the center of the tooling pot-type insulator (12), and the center conductor of the test chamber is connected to the center conductor of the corner unit through the plug contact (13). The center conductor of the test chamber can be extended to connect to the center conductor of the corner unit through the plug contact (13).

7. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: A discharge sensor sensing point (7) is installed at the end of each assessment test chamber.

8. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: The insulation strength of the tooling pot-type insulator (12) is at least 1.2 times the insulation strength of the insulator (8) being tested.

9. The AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to claim 1 is characterized in that: The shell of the assessment test chamber adopts at least one of a cylindrical shell and a spherical shell; the shape of the loop formed by connecting a plurality of test chambers in sequence through corner units is rectangular or polygonal; the gas insulation bushing (1) is located above the plane where the loop formed by connecting all the test chambers is located.

10. The working method of the AC / DC GIS / GIL multi-operating condition equivalent assessment test system according to any one of claims 1 to 9, characterized in that: The process includes the following: Introducing voltage into the central conductor of the test chamber through the gas-insulated bushing (1) and the corner unit; The inductive current booster (6) applies current to the central conductor of the test chamber; The insulator force adjustment device applies a preset force to the insulator (8) under test through a simulated housing (9); The insulator (8) to be tested is tested under the voltage, current and preset force.

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