CN115808586A - Damp-heat aging evaluation device and method for composite insulator under stress action - Google Patents
Damp-heat aging evaluation device and method for composite insulator under stress action Download PDFInfo
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- CN115808586A CN115808586A CN202211582798.6A CN202211582798A CN115808586A CN 115808586 A CN115808586 A CN 115808586A CN 202211582798 A CN202211582798 A CN 202211582798A CN 115808586 A CN115808586 A CN 115808586A
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Abstract
The invention belongs to the field of power equipment detection, and particularly relates to a damp-heat aging evaluation device and method for a composite insulator under the action of stress, wherein the damp-heat aging evaluation device comprises a base and further comprises: the device comprises a flat plate structure sample mechanical device and a cylindrical structure sample mechanical device which are used for placing samples of the composite insulator for the damp-heat aging test. And a flat-plate structure sample mechanical device and a cylindrical structure sample mechanical device are fixedly connected above the base. Compared with the traditional damp and hot aging test, the mechanical force effect is considered, the aging condition of the composite insulator in actual operation can be more fully simulated, the aging condition of the insulator in actual operation in a damp and hot area is judged, and accurate reference is provided for long-term operation of the composite insulator in the damp and hot area.
Description
Technical Field
The invention belongs to the field of power equipment detection, and particularly relates to a damp-heat aging evaluation device and method for a composite insulator under the action of stress.
Background
The insulator is used as a part with a large application quantity on an extra-high voltage transmission line and plays an important role in mechanical support and electrical isolation. Once the insulator breaks down, not only can damage the instrument and equipment, but also can cause a large-scale power failure accident, and influence the normal production and life order of people. The traditional porcelain and glass insulator has the defects of heaviness, poor pollution resistance and the like, and is gradually replaced by a composite insulator in some application occasions. The composite insulator mainly comprises a core rod, a hardware fitting, an umbrella skirt and a sheath. The core rod is made of glass fiber impregnated epoxy resin matrix through a drawing process and mainly bears mechanical loads such as stretching, bending and torsion which may occur in the operation process, the hardware fitting is made of metal materials such as carbon structural steel and the like and plays a role in connection and fixation, the umbrella skirt and the sheath are made of organic materials such as silicon rubber, ethylene propylene rubber or epoxy resin and the like and mainly bear electrical loads in the operation process of the insulator.
Because the core rod and the sheath of the silicon rubber composite insulator are made of different materials, an interface of epoxy resin and silicon rubber exists. The interface between the core rod and the sheath is a macroscopic interface with the largest inner area of the composite insulator, and the macroscopic interface has the largest influence on the composite insulator. The main accidents of the composite insulator are all related to the part of the interface. Moisture easily penetrates through the silicone rubber material to enter the core rod-sheath interface, so that the interface quality is poor, abnormal heating is often caused in the operation process, and the normal operation of the insulator is influenced. Under the high damp and heat and environment in the south, the composite insulator not only needs to bear the effect of long-term high temperature and high humidity, but also can bear the effect of mechanical force generated by a lead due to windage yaw, galloping and the like when the composite insulator is hung, so that a core rod and a sheath of the composite insulator are bent, the two sides of the core rod and the sheath bear the stress in different directions, the concave side bears the pressure effect, and the convex side bears the tensile force effect, so that the core rod and the sheath are strained.
Because the current research on the aging of the composite insulator in a damp and hot environment mainly focuses on carrying out a poaching experiment under an unstressed condition, the electrical performance, the interface performance and the mechanical performance level of the composite insulator after short-term to long-term poaching aging cannot be evaluated. Therefore, the method is very important for evaluating the damp-heat aging performance of the composite insulator under the stress action in the damp-heat environment.
Therefore, the device and the method for evaluating the damp-heat aging of the composite insulator under the action of stress are provided.
Disclosure of Invention
The invention aims to provide a device and a method for evaluating the damp-heat aging of a composite insulator under the stress action, which solve the problem that the electrical performance, the interface performance and the mechanical performance level of the composite insulator after short-term to long-term poaching aging cannot be evaluated at present in the background technology by carrying out poaching experiments on the composite insulator under the stress condition.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a wet thermal ageing evaluation device under composite insulator atress effect, includes the base, still includes: the mechanical device comprises a flat-plate structural sample mechanical device and a cylindrical structural sample mechanical device which are used for placing samples of the composite insulator for carrying out the damp-heat aging test.
And a flat-plate structure sample mechanical device and a cylindrical structure sample mechanical device are fixedly connected above the base.
Preferably, the flat structure sample is a double-layer flat structure composed of epoxy resin and silicon rubber and containing a sheath-core rod interface.
Preferably, the cylindrical structural sample mechanical device comprises a cylindrical core rod made of epoxy resin materials, cylindrical silicon rubber is arranged around the outer side of the core rod, the cylindrical silicon rubber and the core rod are bonded by a coupling agent, and the interface area of the cylindrical core rod is the whole annular sheath-core rod interface.
Preferably, the flat-plate structure sample mechanical device is used for exerting mechanical action on a cylindrical sample; the flat plate structure sample mechanical device comprises a fixed support, an upper plate, a base and a screw device for applying force, wherein the fixed support, the upper plate and the base are arranged on the periphery of the flat plate structure sample mechanical device; the base is provided with four threaded holes for fixing positions and is connected with the upper plate through a fixing support formed by a screw device; the upper plate square aluminum alloy plate is connected with the fixing support through a through threaded hole; the screw rod device penetrates through threaded holes on the periphery of the upper plate and is connected with the threaded holes of the bottom support to fix the flat plate sample.
Preferably, the cylindrical structural sample mechanical device is used for exerting mechanical action on a cylindrical sample; the cylindrical structure sample mechanical device comprises two vertical plates which are vertically arranged and fixed on a base, a screw rod structure and a left clamp and a right clamp; the center positions of the two vertical plates are both provided with through threaded holes, and the screw rod structure can be connected with the clamp through the threaded holes in the centers of the vertical plates; the left clamp is of an aluminum alloy flat plate structure with the area larger than the side projection area of the cylindrical structure sample, the center of the left clamp is connected with the screw rod for fixing, and the position of the left clamp can be adjusted through the matching between the screw rod and the screw hole of the vertical plate; the right clamp is a horizontally-placed U-shaped aluminum alloy plate, and the distance between two sides of the opening end of the U-shaped structure is smaller than the height of the cylindrical structure sample.
Preferably, the stress detection device is used for detecting the stress magnitude of different positions of the sample; the stress detection device comprises a strain gauge and a strain gauge, wherein the strain gauge is placed on a sample; the strain gauges of the flat plate structure sample are arranged on one side, close to the upper plate, of the sample, are perpendicular to the long edge of the upper plate and are arranged at equal intervals; the strain gauges of the cylindrical structure sample are arranged in a circle along the annular structure of the cylindrical structure sample to form a strain flower, so that stress at different positions can be detected.
The invention also provides a damp-heat aging evaluation method of the composite insulator under the action of stress, which comprises the following steps:
the method comprises the following steps: carrying out sample preparation;
step two: fixing the sample to the mechanical device;
step three: measuring stress and strain;
step four: a damp heat aging test was performed.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method and a device for evaluating the damp-heat aging of a composite insulator under stress based on a poaching test of damp-heat aging under an unstressed condition, and can realize accurate evaluation of the performance of a composite insulator sheath, a core rod and a sheath-core rod interface under the action of mechanical force. Compared with the traditional damp and hot aging test, the aging condition of the composite insulator in actual operation can be more fully simulated by considering the action of mechanical force, the aging condition of the composite insulator in actual operation in a damp and hot area is judged, and accurate reference is provided for the long-term operation of the composite insulator in the damp and hot area.
Drawings
FIG. 1 is a schematic structural diagram of a composite insulator flat plate structure sample and a cylindrical structure sample;
fig. 2 is an overall view of the damp-heat aging device under the action of stress on the composite insulator.
In the figure: 1. a base; 2. a flat structure sample mechanical device; 3. a cylindrical structural sample mechanical device; 201. an epoxy resin; 202. silicone rubber; 4. fixing a bracket; 5. an upper plate; 6. a screw device; 7. a flat sample; 8. a cylindrical sample; 9. a vertical plate; 10. a screw structure; 11. and (5) a left clamp and a right clamp.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to solve the problem that the electrical performance, the interface performance and the mechanical performance level of the composite insulator after short-term to long-term poaching and aging cannot be evaluated at present, the invention provides a set of damp-heat aging test device under the action of mechanical force, and the structural schematic diagram of the device is shown in figure 1. The testing device comprises a base 1, a flat-plate structure sample mechanical device 2, a cylindrical structure sample mechanical device 3 and a stress detection device. The base 1 is used for fixing a flat plate structure sample mechanical device 2 and a cylindrical structure sample mechanical device 3. The center parts of the flat-plate structural sample mechanical device 2 and the cylindrical structural sample mechanical device 3 are used for placing samples of the composite insulator for carrying out the damp-heat aging test. The flat structure sample is a double-layer flat structure composed of epoxy resin 201 and silicon rubber 202 and including a sheath-core rod interface. The cylindrical structure sample is a cylindrical short sample cut from the whole composite insulator, the core rod of the epoxy resin 201 is a cylindrical structure, the silicon rubber 202 on the outer side is an annular structure and surrounds the core rod, the silicon rubber 202 and the core rod are bonded by a coupling agent, and the interface area of the silicon rubber is the whole annular sheath-core rod interface.
In one embodiment of the present invention, the flat plate structure sample mechanical device 2 is used to apply mechanical action to a flat plate-shaped sample 7. The device is composed of a fixing support 4, an upper plate 5, a base 1 and a nut device for applying force. The base 1 is provided with four threaded holes at fixed positions and is connected with an upper fixing plate 5 through a fixing bracket 4 consisting of a screw device 6. The upper plate 5 is a square aluminum alloy plate with connecting holes at the periphery and the center, and the connecting holes are through threaded holes. The connecting structure of the fixed support 4 is a screw structure 10, the screw structure 10 penetrates through threaded holes on the periphery of the upper plate 5, and the threaded holes connected with the bottom support fix the flat plate sample. One end of the nut device for applying mechanics is a cylindrical aluminum alloy plate with the height of 5mm and the diameter smaller than the width of a flat-plate structure sample, and the other end of the nut device is a screw rod structure 10. The screw structure 10 penetrates through a central threaded hole of the upper plate 5 from the lower end of the upper plate 5, and the nut is matched, so that the force applied to the flat plate structure sample can be increased by tightening the nut.
As an embodiment of the present invention, the cylindrical structural sample mechanical device 3 is configured to apply a mechanical action to the cylindrical sample 8. The device consists of two vertical plates 9 which are vertically arranged and fixed on a base 1, a screw structure 10 and a left clamp and a right clamp 11. Threaded holes penetrating through the center positions of the two vertical plates 9 are formed, and the screw rod structures 10 can be connected with the clamp through the threaded holes in the centers of the vertical plates 9. The left clamp is of an aluminum alloy flat plate structure with the area larger than the side projection area of the cylindrical structure sample, and the center of the left clamp is connected with the screw rod for fixing. The position of the screw rod is adjusted through the matching between the screw rod and the screw hole of the vertical plate 9. The right clamp is a flat U-shaped aluminum alloy plate, and the distance between two sides of the opening end of the U-shaped structure is smaller than the height of the cylindrical structure sample. The aluminum alloy plate with the U-shaped structure can apply stress to two ends of a cylindrical structure sample so that the cylindrical structure sample is bent, one concave side is pressed, one convex side is pulled, and the humid heat aging conditions of the sample in different stress directions are further measured.
The invention also provides a damp-heat aging evaluation method of the composite insulator under the action of stress, which comprises the following steps:
step 1: sample preparation was performed. The flat plate structure sample adopts a double-layer structure sample of 30mm multiplied by 10mm, and the silicon rubber 202 layer and the epoxy resin 201 layer are both 5mm thick. The cylindrical structure sample is cut and sampled from different positions of the whole composite insulator, the height of the sampled cylindrical structure sample is (30 +/-0.5) mm, the cutting sampling direction and the axis direction of the core body of the composite insulator are 90 degrees, and cutting surfaces at two ends are polished smoothly by 180-mesh abrasive paper.
Step 2: the sample is fixed to a mechanical device. And placing the strain gauge on the sampled composite insulator damp and hot aging sample, and fixing the strain gauge on a damp and hot aging device under the action of the composite insulator. The flat structure sample is placed between a base 1 and an upper plate 5 of the flat structure mechanical device, the supports on the periphery are used for fixing the sample, and the stress of the middle cylinder on the flat structure is increased through the nuts. The cylindrical structure sample is clamped between a left clamp and a right clamp of the cylindrical structure mechanical device, the left clamp is fixed in position, and the stress of the cylindrical structure sample is increased through the screw structure 10 of the right clamp.
And 3, step 3: and (5) measuring stress strain. The strain gauge is connected with the strain gauge, the stress of the flat-plate structure sample and the stress of the cylindrical structure sample are measured, and when the applied force reaches a test requirement value, the positions of the flat-plate structure nut and the cylindrical structure right clamp screw and the stress at the moment are recorded.
And 4, step 4: a damp heat aging test was performed. And (4) taking down the strain gauge, placing the whole test device in a constant-temperature digital display water bath kettle, setting the test temperature to be 100 ℃, and carrying out a damp-heat aging test. After testing for various times, the samples were removed and tested for electrical, interfacial and mechanical properties.
The electric elements in the document are electrically connected with an external main controller and 220V mains supply through a transformer, the main controller can be a conventional known device controlled by a computer and the like, the product model provided by the invention is only used according to the structural characteristics of the product, the product can be adjusted and modified after being purchased, so that the product is more matched with and accords with the technical scheme of the invention, the product model is a technical scheme of the optimal application of the technical scheme, the product model can be replaced and modified according to the required technical parameters, and the product model is familiar to the technical personnel in the field, so that the technical scheme provided by the invention can clearly obtain the corresponding use effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a damp and hot ageing evaluation device of composite insulator under the effect of atress, includes base (1), its characterized in that still includes: the mechanical device comprises a flat-plate structural sample mechanical device (2) and a cylindrical structural sample mechanical device (3), wherein the flat-plate structural sample mechanical device is used for placing a sample of the composite insulator for performing a damp-heat aging test; and a flat-plate structure sample mechanical device (2) and a cylindrical structure sample mechanical device (3) are fixedly connected above the base (1).
2. The device for evaluating the humid and heat aging of a composite insulator under the action of a force according to claim 1, wherein: the flat plate structure sample is a double-layer flat plate structure which is composed of epoxy resin (201) and silicon rubber (202) and comprises a sheath-core rod interface.
3. The device for evaluating the humid and heat aging of a composite insulator under the action of a force according to claim 1, wherein: the cylindrical structure sample mechanical device (3) comprises a cylindrical core rod made of epoxy resin (201), cylindrical silicon rubber (202) surrounds the outer side of the core rod, the cylindrical silicon rubber and the core rod are bonded by a coupling agent, and the interface area of the cylindrical silicon rubber is the whole annular sheath-core rod interface.
4. The device for evaluating the damp-heat aging of the composite insulator under the action of the force according to claim 1, wherein: the flat-plate structure sample mechanical device (2) is used for exerting mechanical action on a flat-plate-shaped sample (7); the flat plate structure sample mechanical device (2) comprises a fixing support (4) on the periphery, an upper plate (5), a base (1) and a screw device (6) for applying force; the base (1) is provided with four threaded holes for fixing positions, and a fixed support (4) formed by a screw device (6) is connected with an upper plate (5); the upper plate (5) is a square aluminum alloy plate and is connected with the fixing support (4) through a through threaded hole; and the screw rod device (6) penetrates through threaded holes on the periphery of the upper plate (5) and is connected with the threaded holes of the bottom support to fix the flat plate sample.
5. The device for evaluating the humid and heat aging of a composite insulator under the action of a force according to claim 4, wherein: the cylindrical structural sample mechanical device (3) is used for exerting mechanical action on a cylindrical sample (8); the cylindrical structure sample mechanical device (3) comprises two vertical plates (9) which are vertically arranged and fixed on a base (1), a screw rod structure (10) and a left clamp and a right clamp (11); threaded holes penetrating through the two vertical plates (9) are formed in the center positions of the two vertical plates, and the screw rod structure (10) can be connected with the clamp through the threaded holes in the centers of the vertical plates (9); the left clamp is of an aluminum alloy flat plate structure with the area larger than the side projection area of the cylindrical structure sample, the center of the left clamp is connected with a screw rod for fixing, and the position of the left clamp can be adjusted through the matching between the screw rod and a screw hole of the vertical plate (9); the right clamp is a horizontally-placed U-shaped aluminum alloy plate, and the distance between two sides of the opening end of the U-shaped structure is smaller than the height of the cylindrical structure sample.
6. The device for evaluating the humid and heat aging of a composite insulator under the action of a force according to claim 5, wherein: the stress detection device is used for detecting the stress of different positions of the sample; the stress detection device comprises a strain gauge and a strain gauge, wherein the strain gauge is placed on a sample; a plurality of strain gauges of the flat plate structure sample are arranged on one side, close to the upper plate (5), of the sample, are perpendicular to the long edge of the upper plate (5), and are arranged at equal intervals; the strain gauges of the cylindrical structure sample are placed in a circle along the annular structure of the cylindrical sample (8) to form a strain flower, so that stress magnitude detection at different positions is realized.
7. A damp and hot aging evaluation method for a composite insulator under the action of stress is characterized by comprising the following steps:
the method comprises the following steps: carrying out sample preparation;
step two: fixing the sample to the mechanical device;
step three: measuring stress and strain;
step four: a damp heat aging test was performed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211582798.6A CN115808586A (en) | 2022-12-08 | 2022-12-08 | Damp-heat aging evaluation device and method for composite insulator under stress action |
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| CN202211582798.6A CN115808586A (en) | 2022-12-08 | 2022-12-08 | Damp-heat aging evaluation device and method for composite insulator under stress action |
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| CN115808586A true CN115808586A (en) | 2023-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117092013A (en) * | 2023-10-19 | 2023-11-21 | 清华大学深圳国际研究生院 | Material ageing experimental device |
| CN117368620A (en) * | 2023-12-04 | 2024-01-09 | 清华大学深圳国际研究生院 | Composite insulator aging experimental device |
-
2022
- 2022-12-08 CN CN202211582798.6A patent/CN115808586A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117092013A (en) * | 2023-10-19 | 2023-11-21 | 清华大学深圳国际研究生院 | Material ageing experimental device |
| CN117368620A (en) * | 2023-12-04 | 2024-01-09 | 清华大学深圳国际研究生院 | Composite insulator aging experimental device |
| CN117368620B (en) * | 2023-12-04 | 2024-04-12 | 清华大学深圳国际研究生院 | Composite insulator aging experimental device |
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