Method and system for monitoring running state of high-voltage bushing

Abstract

The invention belongs to the technical field of power systems, and discloses a high-voltage bushing operation state monitoring method and system, and the method comprises the steps: analyzing a high-voltage bushing, and determining the electric field intensity of a voltage key position of the high-voltage bushing; selecting an electroluminescent material matched with the electric field intensity, and arranging the electroluminescent material at a voltage key position of the high-voltage bushing in operation; and monitoring the operation state of the high-voltage bushing according to the light-emitting state of the electroluminescent material, and judging whether the electric field intensity of the high-voltage bushing in operation is abnormal or not. According to the invention, the electroluminescent material is utilized to emit light according to the voltage transformation of the voltage key position of the high-voltage bushing, and then whether the high-voltage bushing has an abnormal electric field intensity condition or not is judged according to the light-emitting state, so that the online monitoring of the running state of the high-voltage bushing is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and system for monitoring the operating status of a high-voltage bushing. Background Art

[0002] With the continuous development of the power grid and the increasing scale of electricity consumption, in order to avoid the inconvenience caused by power outages and maintenance to the user side, the live detection scheme of power transmission and transformation equipment has become a research hotspot in the power industry. High-voltage bushings are important insulating devices connecting outdoor and indoor equipment. They are assembled from porcelain parts, mounting flanges and conductors. They are suitable for power distribution devices and high-voltage electrical appliances in power plants and substations. They are used for insulation and support of conductive parts passing through walls or other grounding objects. Taking transformer bushings as an example, after long-term operation of the equipment, the bushings are prone to moisture and abnormal discharge, so their status needs to be checked regularly.

[0003] At present, the mainstream solutions for high-voltage bushing status detection are: infrared temperature measurement technology, ultraviolet imaging technology, ultrasonic guided wave technology, etc. The infrared thermal imaging detection method of transformer bushing observes the bushing status through an infrared thermal imager. When the bushing fails, the heat generated by a certain part will be different from normal, resulting in abnormal temperature. This method can detect whether the fault exists, but the cause mechanism of the fault is not clear; ultraviolet imaging detection uses special instruments to receive ultraviolet signals generated by discharge, and after processing, it is superimposed with the visible light image to determine the corona position and intensity on the bushing surface. The fault display is intuitive but the instrument cost is relatively high; ultrasonic guided wave technology uses the property that guided waves will produce echo reflections of different amplitudes when encountering defects. The distance and size of the defect are determined by detecting the time and amplitude of the received echo. This method can only determine the axial position of the defect, and cannot accurately determine its specific position on the cross section.

[0004] In short, with the continuous improvement of my country's power grid construction, regular operation and maintenance of power equipment is particularly important. As the main insulation device outside the transformer box, high-voltage bushings may cause major power outages once defects occur. However, for the current live detection of high-voltage bushings, the fault mechanism and location are not accurate enough, or the cost is high. There is an urgent need for a new method to monitor the operating status of high-voltage bushings to achieve accurate, efficient and low-cost fault detection tasks. Summary of the invention

[0005] The embodiments of the present invention provide a method and system for monitoring the operating status of a high-voltage bushing to solve the above-mentioned technical problems in the prior art.

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0007] According to a first aspect of an embodiment of the present invention, a method for monitoring an operating status of a high-voltage bushing is provided.

[0008] In one embodiment, the high voltage bushing operation status monitoring method comprises:

[0009] Analyze the high-voltage bushing to determine the electric field strength at the key voltage position of the high-voltage bushing;

[0010] Selecting an electroluminescent material that matches the electric field strength, and placing the electroluminescent material at a voltage critical position of the high-voltage bushing in operation;

[0011] According to the luminous state of the electroluminescent material, the operating state of the high-voltage bushing is monitored to determine whether the electric field strength of the high-voltage bushing in operation is abnormal.

[0012] In one embodiment, analyzing the high voltage bushing to determine the electric field strength at a key position of the high voltage bushing includes:

[0013] Analyze the high-voltage bushing and determine the voltage critical position of the high-voltage bushing;

[0014] The voltage critical position is analyzed to determine the electric field strength at the voltage critical position.

[0015] In one embodiment, analyzing the high voltage bushing to determine the voltage critical position of the high voltage bushing includes:

[0016] According to the voltage level and material of the high-voltage bushing, a field strength simulation analysis is performed on the high-voltage bushing to determine the voltage critical position of the high-voltage bushing.

[0017] In one embodiment, the voltage critical positions include: a flange area of ​​the high-voltage bushing, a central area of ​​the high-voltage bushing shed, and an end area of ​​the high-voltage bushing.

[0018] In one embodiment, analyzing the voltage critical position to determine the electric field strength of the voltage critical position includes:

[0019] The voltage key position is simulated and calculated using physical field finite element software to obtain the electric field intensity at the voltage key position.

[0020] In one embodiment, selecting an electroluminescent material that matches the electric field strength includes:

[0021] According to the electric field strength, the electroluminescent material corresponding to the electric field strength is searched in a pre-configured correspondence table of electric field strength and electroluminescent material.

[0022] In one embodiment, the high voltage bushing operation status monitoring method further includes: pre-configuring a table of correspondence between electric field strength and electroluminescent materials; wherein the steps of configuring the table of correspondence between electric field strength and electroluminescent materials include:

[0023] Obtain the electric field strength at the voltage critical position of different high-voltage bushings;

[0024] Based on the obtained electric field strength at the key voltage positions, a high dielectric constant substrate is added to the electroluminescent material, and the dielectric constant of the electroluminescent material is adjusted so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength at the key position;

[0025] According to the correspondence between the electric field intensity at the key voltage position and the adjusted electroluminescent material, a correspondence table between the electric field intensity and the electroluminescent material is prepared.

[0026] In one embodiment, the operation state of the high voltage bushing is monitored according to the luminous state of the electroluminescent material, and judging whether the electric field strength of the high voltage bushing in operation is abnormal includes:

[0027] Confirm the luminous state of electroluminescent materials in a dark environment;

[0028] If the result of confirmation shows that the electroluminescent material is in a luminous state, it is determined that the high voltage bushing has an abnormal electric field strength;

[0029] If the confirmation result is that the electroluminescent material is in a non-luminescent state, it is determined that the high-voltage bushing has no abnormal electric field strength.

[0030] According to a second aspect of an embodiment of the present invention, a high voltage bushing operation status monitoring system is provided.

[0031] In one embodiment, the high voltage bushing operation status monitoring system comprises:

[0032] The electric field strength analysis module is used to analyze the high-voltage bushing and determine the electric field strength at the voltage critical position of the high-voltage bushing;

[0033] An electroluminescent setting module, used for selecting an electroluminescent material matching the electric field strength, and setting the electroluminescent material at a voltage critical position of the high-voltage bushing in operation;

[0034] The operation state judgment module is used to monitor the operation state of the high-voltage bushing according to the luminous state of the electroluminescent material, and judge whether the electric field strength of the high-voltage bushing in operation is abnormal.

[0035] In one embodiment, the electric field strength analysis module includes: a key position analysis module and an electric field strength analysis module, wherein:

[0036] The key position analysis module is used to analyze the high-voltage bushing and determine the voltage key position of the high-voltage bushing;

[0037] The electric field strength analysis module is used to analyze the voltage key position and determine the electric field strength of the voltage key position.

[0038] In one embodiment, when analyzing the high-voltage bushing to determine the voltage critical position of the high-voltage bushing, the key position analysis module performs a field strength simulation analysis on the high-voltage bushing according to the voltage level and material of the high-voltage bushing to determine the voltage critical position of the high-voltage bushing.

[0039] In one embodiment, the voltage critical positions include: a flange area of ​​the high-voltage bushing, a central area of ​​the high-voltage bushing shed, and an end area of ​​the high-voltage bushing.

[0040] In one embodiment, when analyzing the voltage critical position and determining the electric field strength at the voltage critical position, the electric field strength analysis module uses physical field finite element software to perform simulation calculation on the voltage critical position to obtain the electric field strength at the voltage critical position.

[0041] In one embodiment, when selecting the electroluminescent material matching the electric field strength, the electroluminescent setting module searches for the electroluminescent material matching the electric field strength in a pre-configured correspondence table of electric field strength and electroluminescent materials according to the electric field strength.

[0042] In one embodiment, the high-voltage bushing operation status monitoring system further includes: a material configuration module, which is used to pre-configure a correspondence table between electric field strength and electroluminescent material; wherein, when configuring the correspondence table between electric field strength and electroluminescent material, the material configuration module obtains the electric field strength at the voltage key positions of different high-voltage bushings; based on the obtained electric field strength at the voltage key positions, a high dielectric constant substrate is added to the electroluminescent material, and the dielectric constant of the electroluminescent material is adjusted so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength at the key position; and according to the correspondence between the electric field strength at the voltage key position and the adjusted electroluminescent material, a correspondence table between the electric field strength and the electroluminescent material is prepared.

[0043] In one embodiment, the operating state judgment module monitors the operating state of the high-voltage bushing according to the luminous state of the electroluminescent material, and when judging whether the high-voltage bushing in operation has an abnormal electric field strength, the luminous state of the electroluminescent material is confirmed in a dark environment; if the confirmation result is that the electroluminescent material is in a luminous state, it is judged that the high-voltage bushing has an abnormal electric field strength; if the confirmation result is that the electroluminescent material is in a non-luminous state, it is judged that the high-voltage bushing has no abnormal electric field strength.

[0044] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0045] The present invention utilizes electroluminescent materials to emit light according to the voltage transformation at the key voltage position of the high-voltage bushing, and then determines whether the high-voltage bushing has abnormal electric field strength according to the luminescent state, thereby realizing online monitoring of the operating status of the high-voltage bushing. Since it is only necessary to observe the luminescent state of the electroluminescent material, the luminescent state can be determined at a long distance (such as remote observation at night), and the whole process is completely isolated from the high-voltage power equipment, effectively avoiding the risk of electric shock. It not only ensures work safety, but also improves work efficiency. In addition, the method has a clear fault detection mechanism and obvious phenomena. The preparation cost of the luminescent material itself is low, and remote live operation of power monitoring and operation and maintenance is realized.

[0046] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0048] Figure 1 is a flow chart of a method for monitoring the operating status of a high-voltage bushing according to an exemplary embodiment;

[0049] Figure 2 is a structural block diagram of a high voltage bushing operation status monitoring system according to an exemplary embodiment;

[0050] Figure 3 is a schematic diagram of the electroluminescence principle according to an exemplary embodiment;

[0051] Figure 4 is a schematic diagram of electroluminescent materials under different field intensities according to an exemplary embodiment;

[0052] Figure 5 is a schematic diagram of a two-dimensional axisymmetric model according to an exemplary embodiment;

[0053] Figure 6 is a diagram of electric field strength near a high voltage bushing according to an exemplary embodiment. DETAILED DESCRIPTION

[0054] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0055] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0057] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0058] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0059] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0060] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0061] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0062] Figure 1 An embodiment of a high-voltage bushing operating status monitoring method of the present invention is shown.

[0063] In this optional embodiment, the high voltage bushing operation status monitoring method includes:

[0064] Step S101, analyzing the high voltage bushing to determine the electric field strength at the voltage critical position of the high voltage bushing;

[0065] Step S103, selecting an electroluminescent material that matches the electric field strength, and placing the electroluminescent material at a voltage critical position of the high voltage bushing in operation;

[0066] Step S105, monitoring the operating state of the high voltage bushing according to the luminous state of the electroluminescent material, and determining whether the electric field strength of the high voltage bushing in operation is abnormal.

[0067] In this optional embodiment, when analyzing the high voltage bushing to determine the electric field strength at the key position of the high voltage bushing, the high voltage bushing can be analyzed to determine the voltage key position of the high voltage bushing; and the voltage key position can be analyzed to determine the electric field strength at the voltage key position.

[0068] In this optional embodiment, when analyzing the high-voltage bushing and determining the voltage critical position of the high-voltage bushing, the high-voltage bushing can be subjected to field strength simulation analysis according to the voltage level and material of the high-voltage bushing to determine the voltage critical position of the high-voltage bushing. The voltage critical position includes: the flange area of ​​the high-voltage bushing, the central area of ​​the high-voltage bushing shed, and the end area of ​​the high-voltage bushing.

[0069] When analyzing the voltage critical position and determining the electric field strength at the voltage critical position, physical field finite element software may be used to perform simulation calculation on the voltage critical position to obtain the electric field strength at the voltage critical position.

[0070] In this optional embodiment, for selecting an electroluminescent material that matches the electric field strength, the electroluminescent material that matches the electric field strength can be searched in a pre-configured correspondence table of electric field strength and electroluminescent materials according to the electric field strength. The configuration steps of the correspondence table of electric field strength and electroluminescent materials can be: obtaining the electric field strength of the voltage key position of different high-voltage bushings; adding a high dielectric constant substrate to the electroluminescent material based on the obtained electric field strength of the voltage key position, adjusting the dielectric constant of the electroluminescent material so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength of the key position; and making a correspondence table of electric field strength and electroluminescent materials according to the correspondence between the electric field strength of the voltage key position and the adjusted electroluminescent material.

[0071] In this optional embodiment, when the operating state of the high-voltage bushing is monitored according to the luminous state of the electroluminescent material and whether the electric field strength of the high-voltage bushing in operation is abnormally determined, the luminous state of the electroluminescent material is confirmed in a dark environment; if the confirmation result is that the electroluminescent material is in a luminous state, it is determined that the electric field strength of the high-voltage bushing is abnormal; if the confirmation result is that the electroluminescent material is in a non-luminous state, it is determined that the electric field strength of the high-voltage bushing is not abnormal.

[0072] Figure 2 An embodiment of a high voltage bushing operation status monitoring system of the present invention is shown.

[0073] In this optional embodiment, the high voltage bushing operation status monitoring system includes:

[0074] The electric field strength analysis module 201 is used to analyze the high voltage bushing and determine the electric field strength at the voltage critical position of the high voltage bushing;

[0075] The electroluminescent setting module 203 is used to select an electroluminescent material that matches the electric field strength and set the electroluminescent material at a voltage critical position of the high-voltage bushing in operation;

[0076] The operation state judgment module 205 is used to monitor the operation state of the high-voltage bushing according to the luminous state of the electroluminescent material, and judge whether the electric field strength of the high-voltage bushing in operation is abnormal.

[0077] In this optional embodiment, the electric field strength analysis module 201 includes: a key position analysis module (not shown in the figure) and an electric field strength analysis module (not shown in the figure), wherein the key position analysis module is used to analyze the high-voltage bushing and determine the voltage key position of the high-voltage bushing; the electric field strength analysis module is used to analyze the voltage key position and determine the electric field strength of the voltage key position. When the key position analysis module analyzes the high-voltage bushing and determines the voltage key position of the high-voltage bushing, the high-voltage bushing is subjected to field strength simulation analysis according to the voltage level and material of the high-voltage bushing to determine the voltage key position of the high-voltage bushing. The voltage key position includes: the flange area of ​​the high-voltage bushing, the central area of ​​the high-voltage bushing shed, and the end area of ​​the high-voltage bushing. When the electric field strength analysis module analyzes the voltage key position and determines the electric field strength of the voltage key position, the physical field finite element software is used to simulate and calculate the voltage key position to obtain the electric field strength of the voltage key position.

[0078] In this optional embodiment, when selecting the electroluminescent material matching the electric field strength, the electroluminescent setting module 203 searches for the electroluminescent material matching the electric field strength in a preconfigured correspondence table of electric field strength and electroluminescent materials according to the electric field strength.

[0079] In this optional embodiment, the high-voltage bushing operation status monitoring system further includes: a material configuration module (not shown in the figure), which is used to pre-configure a correspondence table between electric field strength and electroluminescent material; wherein, when configuring the correspondence table between electric field strength and electroluminescent material, the material configuration module obtains the electric field strength at the voltage key positions of different high-voltage bushings; based on the obtained electric field strength at the voltage key positions, a high dielectric constant substrate is added to the electroluminescent material, and the dielectric constant of the electroluminescent material is adjusted so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength at the key position; and according to the correspondence between the electric field strength at the voltage key position and the adjusted electroluminescent material, a correspondence table between the electric field strength and the electroluminescent material is prepared.

[0080] In this optional embodiment, the operating state judgment module 205 monitors the operating state of the high-voltage bushing according to the luminous state of the electroluminescent material, and when judging whether the electric field strength of the high-voltage bushing in operation is abnormal, the luminous state of the electroluminescent material is confirmed in a dark environment; if the confirmation result is that the electroluminescent material is in a luminous state, it is judged that the electric field strength of the high-voltage bushing is abnormal; if the confirmation result is that the electroluminescent material is in a non-luminous state, it is judged that the electric field strength of the high-voltage bushing is not abnormal.

[0081] In order to better understand the above technical solution of the present invention, the above technical solution of the present invention is further explained below from the perspectives of electroluminescent material principle and electric field intensity principle.

[0082] The electroluminescent effect refers to a solid luminescence phenomenon in which electrons and holes recombine and emit light under the excitation of a relatively high DC or AC electric field, directly converting electrical energy into light energy. When an electroluminescent material emits light under the action of a high electric field, electrons at deep energy levels in the material are accelerated by the electric field to become superheated electrons. When superheated electrons collide with the luminescence center, the energy of the electrons in the luminescence center jumps from the ground state energy level E1 to the high energy level E2. When the electrons in the luminescence center return from the high energy level E2 to the ground state energy level E1, photons are released to make the material emit light, that is, E2-E1=hv, where v is the frequency of light and determines the color of the light. The principle of luminescence is as follows: Figure 3 shown.

[0083] Electroluminescent materials are field-controlled materials. The luminous intensity of the material is positively correlated with the electric field strength. The stronger the external electric field, the higher the luminous intensity of the material. The luminous changes of the material can be used to analyze the changes in the electric field in the area where the material is located. The luminous conditions of the material under different field strengths are as follows: Figure 4 shown.

[0084] Since the luminous intensity of the material needs to be defined under a standard and unified environment, it can be measured in the laboratory, but the actual equipment operating environment is complex and changeable, and it is not easy to judge its luminous intensity by long-distance detection. Therefore, the present invention changes the material ratio (such as: in the basic coating component "RTV coating mixed with ZnS:Cu powder", adjust the content of ZnS:Cu powder, or dope barium titanate, silicon dioxide and other powders to change the electroluminescent threshold of the coating, that is, add a high dielectric constant substrate to the electroluminescent material, adjust the dielectric constant of the electroluminescent material, so that the luminous electric field intensity of the electroluminescent material is less than or equal to the electric field intensity at the key position), adjust the luminous electric field threshold of the material coating, apply it at different positions of the sleeve, and observe whether the coating at each position emits light to judge whether its electric field intensity is abnormal.

[0085] The function of high-voltage bushing is to lead current-carrying conductors into and out of electrical equipment such as transformers or through walls, while maintaining insulation from metal casings or walls with different potentials. A flange is installed in the middle of the outer insulation of the bushing for fixing. The voltage gradient between the flange and the conductor is the largest, and the electric field at the edge of the flange is very concentrated. At the same time, affected by the conductor voltage, the component of the electric field line perpendicular to the gas-solid interface increases significantly. The bushing is an insulating structure with a strong vertical electric field component. Common defects of high-voltage bushings mainly include insulation aging, cracks and fractures, sealing failure, mechanical damage, etc. These defects will cause changes in the electric field distribution on the surface or inside of the bushing. By photographing the electroluminescent material with a camera and analyzing the luminescence of the coating in the image, the electric field intensity range at the corresponding position can be obtained, thereby judging whether the bushing has defects.

[0086] Since the electric field strength near high-voltage bushings of different voltage levels and different materials varies greatly when they are energized, it is not easy to uniformly set the field luminescence threshold. Therefore, first, electroluminescent coatings with different luminescence thresholds can be prepared, and the electric field strength thresholds at key positions on the bushing surface (including the area near the flange, the center of the shed, and both ends of the bushing) can be determined based on the electric field simulation results of the transformer bushing during normal operation (taking 110kV porcelain bushing as an example, the two-dimensional axisymmetric model is as follows Figure 5 As shown, the surrounding field strength is as Figure 6 As shown in FIG. 1 , an electroluminescent material coating with a corresponding luminescence threshold is sprayed on key positions on the surface of the transformer bushing.

[0087] When simulating the electric field of the transformer bushing, COMSOL Multiphysics finite element analysis software can be used to establish a two-dimensional axisymmetric model of the bushing (such as Figure 5 As shown in the figure, the electrical parameters of the material are set, and the metal part of the bushing is regarded as an ideal metal conductor. The steady-state voltage is set for the oil pillow, guide rod, and tail grading ring, and the air boundary, riser housing, flange, and end screen are grounded. The remaining capacitor plates are set to floating potential. For the 110kV bushing, the voltage is set to the steady-state maximum operating voltage amplitude of 103kV, and the simulation is performed. The results are as follows Figure 6 As shown, the electric field intensity distribution on the normal casing surface can be obtained. For a certain key position, a margin is given to allow the intensity to exceed the limit, and the electric field intensity threshold at the key position can be determined.

[0088] When the equipment is powered on, the coating at each location will automatically determine the field strength range at that location, and use a camera to remotely observe and record the luminescence of the electroluminescent material in a dark environment: Under normal circumstances, the electric field size at each location is smaller than the threshold, and all electroluminescent material coatings do not emit light; if there are defects in the insulating material, such as cracks or degradation of insulation performance due to aging, the electric field distribution will be affected, causing the electric field strength in certain areas to be greater than the normal threshold due to distortion, and the electroluminescent material will emit light to show the distorted location.

[0089] In practical applications, the qualitative judgment of the existence of defects is relatively rough, and only 4-5 key parts need to be coated; if the accuracy of the defect type is to be improved, the number of coatings is increased to coat multiple parts (9-10) (when the number of coatings is increased to coat multiple parts (9-10), each bushing has n parts and 2 to the power of n states. For different defect types, the luminous state of one key part may be the same, while the luminous state of other parts is different. Therefore, the combination of luminous values ​​of all key parts on the bushing is different, so based on the different combinations of luminous states, the luminous state relationship corresponding to different defects can be formed, and a "defect-luminous condition" comparison table of key parts of the bushing can be constructed, and then the corresponding defect type can be determined based on the "defect-luminous condition" comparison table). According to the luminous condition of the electroluminescent coating, the severity and possible impact of the defect are evaluated. If necessary, other detection methods can be combined to further confirm the defect. According to the test results, if serious defects are found, immediate measures need to be taken, such as repairing or replacing damaged high-voltage bushing components, to maintain the safety and reliability of the power system.

[0090] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for monitoring the operating status of a high-voltage bushing, characterized in that: include: Analyze the high-voltage bushing to determine the electric field strength at the key voltage position of the high-voltage bushing; Selecting an electroluminescent material that matches the electric field strength, and placing the electroluminescent material at a voltage critical position of the high-voltage bushing in operation; According to the luminous state of the electroluminescent material, the operating state of the high-voltage bushing is monitored to determine whether the electric field strength of the high-voltage bushing in operation is abnormal.

2. The method for monitoring the operating status of a high voltage bushing according to claim 1, characterized in that: Analyze the high voltage bushing and determine the electric field strength at key locations of the high voltage bushing, including: Analyze the high-voltage bushing and determine the voltage critical position of the high-voltage bushing; The voltage critical position is analyzed to determine the electric field strength at the voltage critical position.

3. The method for monitoring the operating status of a high voltage bushing according to claim 2, characterized in that: Analyze the high-voltage bushing and determine the key voltage positions of the high-voltage bushing, including: According to the voltage level and material of the high-voltage bushing, a field strength simulation analysis is performed on the high-voltage bushing to determine the voltage critical position of the high-voltage bushing.

4. The method for monitoring the operating status of a high voltage bushing according to any one of claims 1 to 3, characterized in that: The voltage key positions include: the flange area of ​​the high-voltage bushing, the central area of ​​the high-voltage bushing shed, and the end area of ​​the high-voltage bushing.

5. The method for monitoring the operating status of a high voltage bushing according to claim 2, characterized in that: Analyzing the voltage critical position to determine the electric field strength at the voltage critical position includes: The voltage key position is simulated and calculated using physical field finite element software to obtain the electric field strength at the voltage key position.

6. The method for monitoring the operating status of a high voltage bushing according to claim 1, characterized in that: The electroluminescent material selected to match the electric field strength includes: According to the electric field strength, an electroluminescent material corresponding to the electric field strength is searched in a pre-configured correspondence table of electric field strength and electroluminescent materials.

7. The method for monitoring the operating status of a high voltage bushing according to claim 6, characterized in that: Also includes: Pre-configure the correspondence table between electric field strength and electroluminescent material; wherein the configuration steps of the correspondence table between electric field strength and electroluminescent material include: Obtain the electric field strength at the key voltage positions of different high-voltage bushings; Based on the obtained electric field strength at the key voltage positions, a high dielectric constant substrate is added to the electroluminescent material, and the dielectric constant of the electroluminescent material is adjusted so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength at the key position; According to the correspondence between the electric field intensity at the key voltage position and the adjusted electroluminescent material, a correspondence table between the electric field intensity and the electroluminescent material is prepared.

8. The method for monitoring the operating status of a high voltage bushing according to claim 1, characterized in that: According to the luminous state of the electroluminescent material, the operating state of the high-voltage bushing is monitored to determine whether the electric field strength of the high-voltage bushing in operation is abnormal, including: Confirm the luminous state of electroluminescent materials in a dark environment; If the result of confirmation shows that the electroluminescent material is in a luminous state, it is determined that the high voltage bushing has an abnormal electric field strength; If the confirmation result shows that the electroluminescent material is in a non-luminescent state, it is determined that the high-voltage bushing has no abnormal electric field strength.

9. A high voltage bushing operation status monitoring system, characterized in that: include: The electric field strength analysis module is used to analyze the high-voltage bushing and determine the electric field strength at the voltage critical position of the high-voltage bushing; An electroluminescent setting module, used for selecting an electroluminescent material that matches the electric field strength, and setting the electroluminescent material at a voltage critical position of the high-voltage bushing in operation; The operation state judgment module is used to monitor the operation state of the high-voltage bushing according to the luminous state of the electroluminescent material, and judge whether the electric field strength of the high-voltage bushing in operation is abnormal.

10. The high voltage bushing operation status monitoring system according to claim 9, characterized in that: The electric field strength analysis module includes: a key position analysis module and an electric field strength analysis module, wherein: The key position analysis module is used to analyze the high-voltage bushing and determine the voltage key position of the high-voltage bushing; The electric field strength analysis module is used to analyze the voltage key position and determine the electric field strength of the voltage key position.

11. The high voltage bushing operation status monitoring system according to claim 10, characterized in that: When analyzing the high-voltage bushing to determine the voltage critical position of the high-voltage bushing, the key position analysis module performs field strength simulation analysis on the high-voltage bushing according to the voltage level and material of the high-voltage bushing to determine the voltage critical position of the high-voltage bushing.

12. The high voltage bushing operation status monitoring system according to any one of claims 9 to 11, characterized in that: The voltage key positions include: the flange area of ​​the high-voltage bushing, the central area of ​​the high-voltage bushing shed, and the end area of ​​the high-voltage bushing.

13. The high voltage bushing operation status monitoring system according to claim 10, characterized in that: When analyzing the voltage key position and determining the electric field strength at the voltage key position, the electric field strength analysis module uses physical field finite element software to perform simulation calculation on the voltage key position to obtain the electric field strength at the voltage key position.

14. The high voltage bushing operation status monitoring system according to claim 9, characterized in that: When selecting the electroluminescent material matching the electric field strength, the electroluminescent setting module searches for the electroluminescent material matching the electric field strength in a pre-configured correspondence table of electric field strength and electroluminescent materials according to the electric field strength.

15. The high voltage bushing operation status monitoring system according to claim 14, characterized in that: Also includes: A material configuration module is used to pre-configure a correspondence table between electric field strength and electroluminescent material; wherein, when configuring the correspondence table between electric field strength and electroluminescent material, the material configuration module obtains the electric field strength at the voltage key positions of different high-voltage bushings; based on the obtained electric field strength at the voltage key positions, a high dielectric constant substrate is added to the electroluminescent material, and the dielectric constant of the electroluminescent material is adjusted so that the luminous electric field strength of the electroluminescent material is less than or equal to the electric field strength at the key position; and according to the correspondence between the electric field strength at the voltage key position and the adjusted electroluminescent material, a correspondence table between electric field strength and electroluminescent material is prepared.

16. The high voltage bushing operation status monitoring system according to claim 9, characterized in that: The operation state judgment module monitors the operation state of the high-voltage bushing according to the luminous state of the electroluminescent material, and when judging whether the electric field strength of the high-voltage bushing in operation is abnormal, the luminous state of the electroluminescent material is confirmed in a dark environment; if the confirmation result is that the electroluminescent material is in a luminous state, it is judged that the electric field strength of the high-voltage bushing is abnormal; if the confirmation result is that the electroluminescent material is in a non-luminous state, it is judged that the electric field strength of the high-voltage bushing is not abnormal.

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