Dry-type bushing multi-factor aging device and aging method

Abstract

The invention discloses a dry-type bushing multi-factor aging device and an aging method, the aging device comprises an artificial climate box, the artificial climate box comprises a temperature and humidity control system, and a dry-type bushing is arranged in the artificial climate box; the vibration platform comprises a vibration control system, is arranged in the artificial climate box and is fixed with the bottom end of the dry sleeve; the execution end of the electric field assembly is electrically connected with a conductive piece of the dry type bushing, and the electric field assembly is used for adjusting the current value applied to the dry type bushing; and the industrial personal computer is electrically connected with the temperature and humidity control system and the vibration control system, and is used for regulating and controlling the temperature and humidity in the artificial climate box and adjusting vibration parameters of the vibration platform. The aging device can research the long-term aging performance change of the dry-type bushing from the perspective of single-factor or multi-factor coupling of an electric field, temperature, humidity and vibration, and can more accurately analyze the performance change condition of the dry-type bushing under the actual operation condition.

Description

Technical Field

[0001] The invention relates to a dry-type bushing multi-factor aging device and an aging method, belonging to the technical field of insulation aging of power transmission and transformation equipment. Background Art

[0002] Bushing is an important part of transformer. On the one hand, it can lead out transformer windings to form electrical connection with other equipment, and on the other hand, it can maintain electrical insulation with other equipment. With the rapid advancement of power grid construction and development, the demand for power transmission and transformation market has increased. Dry impregnated fiber bushing has been rapidly promoted due to its relatively simple manufacturing method, good insulation performance, high mechanical strength, and installation at any angle. Compared with porcelain sleeve oil-paper insulation bushing, it will not explode and fall randomly due to failure, further affecting the normal operation of other electrical equipment. Therefore, it has been widely used in converter station valve hall wall bushing, UHV DC dry bushing, etc.

[0003] Dry bushing refers to electrical conductive equipment that is formed by epoxy resin impregnated insulating paper or alkali-free glass fiber through high temperature curing outside the capacitor core, and externally injected with silicone rubber shed. Epoxy resin impregnated insulating paper or alkali-free glass fiber mainly provides internal insulation. During operation, it not only has to bear the strong electric field brought by the capacitor core, but also the heat brought by the current. The silicone rubber shed mainly serves as external insulation, and can also prevent moisture from the external environment from invading the epoxy resin layer, causing the bushing to become damp and cause partial discharge and breakdown accidents.

[0004] Due to the special use environment and layout of high-voltage bushings, their bearing capacity will be affected by their own weight or transformer vibration during operation. At the same time, due to multiple factors such as environmental humidity, electric field, and stress, dry bushings will also experience epoxy resin cracking, internal partial discharge and other faults during long-term operation. In severe cases, they will cause interface damage and even interface breakdown, which will eventually lead to the breakdown of the entire dry bushing. Therefore, the study of multi-factor aging of dry bushings is an important means to achieve long-term performance evaluation of dry bushings.

[0005] Existing aging research on dry bushings mainly considers the aging of epoxy resin and silicone rubber materials under single factors, including UV aging, wet heat aging, thermal oxygen aging, and mechanical vibration research of dry bushings. These aging studies do not consider the long-term aging performance changes of dry bushings after mutual coupling under multiple factors. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-factor aging device and aging method for dry bushing, which can study the long-term aging performance changes of dry bushing from the perspective of electric field, temperature and humidity, vibration single factor or multi-factor coupling, and more accurately analyze its performance changes under actual operation conditions.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A dry casing multi-factor aging device, comprising:

[0009] An artificial climate chamber, including a temperature and humidity control system, wherein the dry casing is arranged in the artificial climate chamber;

[0010] A vibration platform, including a vibration control system, is disposed in the artificial climate chamber and fixed to the bottom end of the dry casing;

[0011] An electric field assembly, the execution end of which is electrically connected to the conductive member of the dry bushing, and is used to adjust the current value applied to the dry bushing;

[0012] The industrial computer is electrically connected to the temperature and humidity control system and the vibration control system, and is used to control the temperature and humidity in the artificial climate box and to adjust the vibration parameters of the vibration platform.

[0013] Preferably, the electric field assembly comprises:

[0014] The wall bushing is installed on the artificial climate chamber, and the output end is electrically connected to the conductive rod of the dry bushing;

[0015] Current limiting resistor, the output end is connected to the input end of the wall bushing;

[0016] A high voltage power supply, the output end of which is connected to the input end of a current limiting resistor, is used to adjust the output voltage.

[0017] Preferably, the aging device further comprises:

[0018] The fixing assembly is arranged in the artificial climate box located above the vibration platform and is used to fix the pipe body of the dry casing. It includes two telescopic rods symmetrically arranged on the two side walls of the artificial climate box and lock buckles symmetrically arranged at the ends of the two telescopic rods. Both ends of the lock buckles are formed with connecting parts. The dry casing is inserted through the circle formed by the two lock buckles, and the two lock buckles are connected by a bolt assembly.

[0019] Preferably, the vibration mode includes horizontal vibration or vertical vibration.

[0020] A dry-type bushing aging method is to use any of the above-mentioned aging devices for aging, comprising the following steps:

[0021] S1. Determine the temperature, humidity, vibration frequency, vibration amplitude and current value according to the sample parameters and aging requirements;

[0022] S2. Fix the dry bushing in the artificial climate chamber, fix it to the vibration platform through the flange at the bottom and ground it, and then connect it to the execution end of the electric field assembly through the conductive part at the top;

[0023] S3. Configure one or more of temperature, humidity, vibration frequency, vibration amplitude and current value to age the dry bushing.

[0024] The beneficial effects of the present invention are:

[0025] The aging device can couple multiple aging factors together, including moisture and heat factors, vibration factors and current factors. It can not only carry out single-factor aging tests, but also complete multi-factor coupled aging tests. At the same time, the vibration platform can also apply vibrations in both horizontal and vertical directions, and the frequency is adjustable, making the test more flexible and effective, and with better practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the connection diagram of the multi-factor aging device;

[0027] Figure 2 A top view of the lock connection.

[0028] The main reference numerals in the figure have the following meanings:

[0029] 1. Artificial climate chamber, 2. Vibration platform, 3. Electric field assembly, 4. Industrial computer, 5. Wall bushing, 6. Current limiting resistor, 7. High voltage power supply, 8. Telescopic rod, 9. Lock, 10. Temperature and humidity control system, 11. Vibration control system, 12. Dry bushing. DETAILED DESCRIPTION

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

[0031] This embodiment provides a dry type bushing multi-factor aging device, see Figure 1-2 As shown, it includes an artificial climate box 1, a vibration platform 2, an electric field component 3 and an industrial computer 4. Among them, the electric field component 3 includes a wall bushing 5, a current limiting resistor 6 and a high-voltage power supply 7. The input end of the current limiting resistor 6 is connected to the voltage divider of the high-voltage power supply 7, and the output end is connected to the input end of the wall bushing 5. The wall bushing 5 is horizontally installed on the artificial climate box 1, and its output end is electrically connected to the conductive rod of the dry bushing 12. Different current values ​​are applied to the dry bushing 12 by adjusting the voltage.

[0032] The vibration platform 2 is arranged at the bottom of the artificial climate box 1, and the dry-type casing 12 is fixed on the vibration platform 2 through the flange at the bottom and then grounded through the flange. At the same time, two telescopic rods 8 are symmetrically arranged on the corresponding side wall of the artificial climate box 1 located above the vibration platform 2, and a semicircular lock buckle 9 is arranged at the end of each telescopic rod 8. The ends of the two lock buckles 9 form corresponding connecting parts, and the connecting parts are provided with corresponding threaded holes. The two lock buckles 9 are made to surround the tube body of the dry-type casing 12 by adjusting the telescopic rod 8, and then the two lock buckles 9 are connected by a bolt assembly.

[0033] The artificial climate box 1 includes a temperature and humidity control system 10, which can be programmed to perform temperature and humidity cycles and real-time control to ensure the stability of temperature and humidity during the aging process. The vibration platform 2 includes a vibration control system 11, which can provide vibration in both horizontal and vertical directions, and the vibration frequency and amplitude can be adjusted. Both are electrically connected to the industrial computer 4, and the temperature and humidity in the artificial climate box 1 and the vibration parameters (frequency and amplitude) of the vibration platform 2 are adjusted through the industrial computer 4.

[0034] When aging the dry bushing, first determine the temperature, humidity, vibration frequency, vibration amplitude and current value according to the sample parameters and aging requirements; then fix the dry bushing in the artificial climate box 1, fix it to the vibration platform 2 through the flange at the bottom and then ground it, and then connect it to the output end of the wall bushing 5 through the conductive part at the top; then configure one or more of the temperature, humidity, vibration frequency, vibration amplitude and current value according to the aging requirements to perform aging treatment on the dry bushing for different lengths of time, and finally test the performance of the dry bushing after aging, so as to analyze the long-term aging performance changes of the dry bushing from the perspective of multi-factor coupling, and provide guidance for the production of dry bushing and performance evaluation of different operating years.

[0035] The above is only a preferred implementation of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A dry casing multi-factor aging device, characterized in that: include: An artificial climate chamber, including a temperature and humidity control system, wherein the dry casing is arranged in the artificial climate chamber; A vibration platform, including a vibration control system, is disposed in the artificial climate chamber and fixed to the bottom end of the dry casing; The electric field component, whose execution end is electrically connected to the conductive part of the dry bushing, is used to adjust the current value applied to the dry bushing; the industrial computer, which is electrically connected to the temperature and humidity control system and the vibration control system, is used to control the temperature and humidity in the artificial climate box and to adjust the vibration mode and parameters of the vibration platform.

2. The dry type bushing multi-factor aging device according to claim 1, characterized in that: The electric field components include: The wall bushing is installed on the artificial climate chamber, and the output end is electrically connected to the conductive rod of the dry bushing; Current limiting resistor, the output end is connected to the input end of the wall bushing; A high voltage power supply, the output end of which is connected to the input end of a current limiting resistor, is used to adjust the output voltage.

3. The dry type bushing multi-factor aging device according to claim 1, characterized in that: The aging device also includes: The fixing assembly is arranged in the artificial climate box located above the vibration platform and is used to fix the pipe body of the dry casing. It includes two telescopic rods symmetrically arranged on the two side walls of the artificial climate box and lock buckles symmetrically arranged at the ends of the two telescopic rods. Both ends of the lock buckles are formed with connecting parts. The dry casing is inserted through the circle formed by the two lock buckles, and the two lock buckles are connected by a bolt assembly.

4. The dry type bushing multi-factor aging device according to claim 1, characterized in that: Vibration modes include horizontal vibration or vertical vibration.

5. A dry bushing aging method, characterized in that: The aging is performed using the aging device described in any one of claims 1 to 4, comprising the following steps: S1. Determine the temperature, humidity, vibration frequency, vibration amplitude and current value according to the sample parameters and aging requirements; S2. Fix the dry bushing in the artificial climate chamber, fix it to the vibration platform through the flange at the bottom and ground it, and then connect it to the execution end of the electric field assembly through the conductive part at the top; S3. Configure one or more of temperature, humidity, vibration frequency, vibration amplitude and current value to age the dry bushing.

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