Partial discharge detection method and system for insulation deterioration degree evaluation of power equipment

Abstract

The invention discloses a partial discharge detection method and a partial discharge detection system for insulation deterioration degree evaluation of power equipment, and relates to the technical field of insulation deterioration degrees. The method comprises the following steps: evaluating self characteristic function indexes of each area of an isolating switch of the high-voltage switch equipment, recording an operation sequence of the isolating switch and a circuit breaker to obtain operation data, evaluating a cooperative operation function index of the isolating switch of the high-voltage switch equipment, dividing a safety level of the high-voltage switch equipment, and matching an insulation degradation degree of the high-voltage switch equipment. And carrying out discharge detection according to the insulation degradation degree. According to the method, subjective judgment errors are avoided, inducements of insulation degradation are reduced, a direction is provided for systematic troubleshooting, insulation materials are prevented from being further degraded, the operation reliability of equipment is improved, the operation and maintenance cost is reduced, the safe and stable operation capacity of a power system is improved, and fault expansion is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulation deterioration degree, and particularly relates to a partial discharge detection method and system for evaluating insulation deterioration degree of power equipment. BACKGROUND

[0002] In modern power systems, power equipment such as high-voltage switching equipment is a core component of power grid operation, and the stability of its insulation performance is directly related to the safe and reliable operation of the power system. With the long-term operation of power equipment, under the action of electric field, heat, mechanical stress and environmental factors, insulation materials will inevitably deteriorate. When the insulation deterioration develops to a certain extent, it will cause partial discharge, and in severe cases, it will even lead to equipment insulation breakdown, causing large-scale power outages and causing huge economic losses and social impact. Therefore, it is necessary to analyze the partial discharge detection method and system for evaluating the insulation deterioration degree of power equipment.

[0003] The prior art such as the patent for invention with publication number CN102193052B discloses a method for jointly evaluating oil-paper insulation state by using a multi-statistical parameter, which detects the partial discharge of oil-paper insulation in power equipment by using an ultra-wideband partial discharge detection system, collects and extracts partial discharge statistical parameters of oil-paper insulation. The invention can predict the degree of harm of partial discharge when the insulation has not failed, prevent insulation failure, reduce the possibility of power equipment failure caused by insulation failure, has high accuracy, small dispersion, and is easy to implement, and does not affect the operation of power equipment.

[0004] The partial discharge detection method and system for evaluating the insulation deterioration degree of power equipment in the prior art can meet the basic requirements, but there are some potential defects and challenges, which are embodied in the following aspects: 1. The existing technology does not pay enough attention to the contact appearance detection of the disconnecting switch of high-voltage switching equipment through visual and image recognition technology, which affects the acquisition of three-dimensional topographic data, affects the evaluation of the self-characteristic function index of each region of the disconnecting switch of high-voltage switching equipment, and further affects the prediction of the electric field stress borne by the insulation medium. Due to the lack of attention to recording the operation sequence of the disconnecting switch and the circuit breaker, the acquisition of operation data is affected, which leads to an increase in the risk of arc discharge, insulation breakdown and other risks due to incorrect operation sequence, increases the inducement of insulation deterioration, and further affects the evaluation of the cooperative operation function index of the disconnecting switch of high-voltage switching equipment, leading to the occurrence of further insulation material deterioration and reducing the reliability of equipment operation.

[0005] II. The prior art is not accurate enough in jointly analyzing the self characteristic function index of each area of the disconnecting switch of the obtained high-voltage switching device and the cooperative operation function index of the disconnecting switch of the high-voltage switching device, and does not pay enough attention to the division of the safety level of the high-voltage switching device, which affects the matching of the insulation deterioration degree of the high-voltage switching device, and further affects the discharge detection according to the insulation deterioration degree, reduces the detection efficiency, increases the operation and maintenance cost, reduces the safe and stable operation ability of the power system, causes the expansion of the fault, and further increases the problem of cascading failure. SUMMARY

[0006] The purpose of the present application is to provide a partial discharge detection method and system for evaluating the insulation deterioration degree of power equipment, which solves the problems in the background art.

[0007] To solve the above technical problems, the present application adopts the following technical scheme: the present application provides a partial discharge detection method for evaluating the insulation deterioration degree of power equipment, comprising: step one, contact appearance detection of the disconnecting switch of the high-voltage switching device is performed through visual and image recognition technology to obtain three-dimensional topographic data, and then the self characteristic function index of each area of the disconnecting switch of the high-voltage switching device is evaluated.

[0008] Step two, the operation sequence of the disconnecting switch and the circuit breaker is recorded to obtain operation data, and the cooperative operation function index of the disconnecting switch of the high-voltage switching device is evaluated.

[0009] Step three, based on the obtained self characteristic function index of each area of the disconnecting switch of the high-voltage switching device and the cooperative operation function index of the disconnecting switch of the high-voltage switching device, the safety level of the high-voltage switching device is divided, the insulation deterioration degree of the high-voltage switching device is matched, and discharge detection is performed according to the insulation deterioration degree.

[0010] Further, the contact appearance detection of the disconnecting switch of the high-voltage switching device through visual and image recognition technology has the following specific analysis method: an industrial-grade camera is used, a light supplementing device is matched, a laser range finder and a three-dimensional structured light sensor are combined, and three-dimensional topographic data is obtained.

[0011] Further, the evaluation of the self characteristic function index of each area of the disconnecting switch of the high-voltage switching device has the following specific analysis method: based on the obtained three-dimensional topographic data, the surface defect data, the mechanical deformation data and the contact contact data are included in the three-dimensional appearance data, the surface defect value , the mechanical deformation value and the contact contact value of each area of the disconnecting switch of the high-voltage switching device are analyzed, the self characteristic function index of each area of the disconnecting switch of the high-voltage switching device is evaluated, and the specific calculation formula is as follows: wherein, is represented as the number of regions, , is represented as the number of regions, is represented as a logical symbol or, , and are respectively a surface defect value safety interval, a mechanical deformation value safety interval and a contact contact value safety interval of each region of the disconnector of the high-voltage switching device.

[0012] Further, it is characterized in that the surface defect value of each region of the disconnector of the high-voltage switching device is specifically analyzed in the following way: based on the obtained surface defect data, wherein the surface defect data includes the number of corrosion spots, the length of cracks and the area of burning of each region of the disconnector of the high-voltage switching device, and the number of corrosion spot safety interval, the length of crack safety interval and the area of burning safety interval of the disconnector of the high-voltage switching device are extracted from the database, the number of corrosion spots, the length of cracks and the area of burning of each region of the disconnector of the high-voltage switching device are compared with the number of corrosion spot safety interval, the length of crack safety interval and the area of burning safety interval of each region of the disconnector of the high-voltage switching device stored in the database, if the number of corrosion spots of a certain region of the disconnector of the high-voltage switching device is not in the number of corrosion spot safety interval, the length of cracks is not in the length of crack safety interval and the area of burning is not in the area of burning safety interval, the surface defect value of the region of the disconnector of the high-voltage switching device is recorded as -1, otherwise as 1, and then the surface defect value of each region of the disconnector of the high-voltage switching device is obtained , The value of includes -1 and 1.

[0013] Further, it is characterized in that the mechanical deformation value of each region of the disconnector of the high-voltage switching device is specifically analyzed in the following way: based on the obtained mechanical deformation data, wherein the mechanical deformation data includes the flatness of contact surface and the contact gap distance of each region of the disconnector of the high-voltage switching device, and the flatness of contact surface compliance interval and the contact gap distance compliance interval of each region of the disconnector of the high-voltage switching device are extracted from the database, the flatness of contact surface and the contact gap distance of each region of the disconnector of the high-voltage switching device are compared with the flatness of contact surface compliance interval and the contact gap distance compliance interval of each region of the disconnector of the high-voltage switching device stored in the database, if the flatness of contact surface of a certain region of the disconnector of the high-voltage switching device is not in the flatness of contact surface compliance interval or the contact gap distance is not in the contact gap distance compliance interval, the mechanical deformation value of the region of the disconnector of the high-voltage switching device is recorded as -1, otherwise as 1, and then the mechanical deformation value of each region of the disconnector of the high-voltage switching device is obtained wherein, The values ​​include -1 and 1.

[0014] Furthermore, it is characterized in that the contact contact value of each area of ​​the isolating switch of the high-voltage switchgear is specifically analyzed by the following method: based on the obtained contact contact data, wherein the contact contact data includes: the contact wear depth and dust coverage rate of each area of ​​the isolating switch of the high-voltage switchgear, and the contact wear depth compliance interval and the dust coverage rate compliance interval of the isolating switch of the high-voltage switchgear are extracted from the database for comparison; if the contact wear depth of each area of ​​the isolating switch of the high-voltage switchgear is within the contact wear depth compliance interval and the dust coverage rate is within the dust coverage rate compliance interval, then the contact contact value of the area of ​​the isolating switch of the high-voltage switchgear is recorded as 1, otherwise it is recorded as -1, thereby obtaining the contact contact value of each area of ​​the isolating switch of the high-voltage switchgear. ,in, The values ​​include 1 and -1.

[0015] Furthermore, it is characterized in that the collaborative operation function index of the disconnector of the high-voltage switchgear is evaluated by a specific analysis method: based on the obtained operation data, wherein the operation data includes: the opening delay time, operation timing deviation value, interlocking failure rate, and vibration speed of the disconnector of the high-voltage switchgear, and extracting the opening delay time safety interval, operation timing deviation value safety interval, interlocking failure rate safety interval, and vibration speed safety interval of the disconnector of the high-voltage switchgear from the database, the collaborative operation function index of the disconnector of the high-voltage switchgear is evaluated, and the specific calculation formula is: , Indicates the disconnector of high voltage switchgear Running data, Indicates the disconnector of high voltage switchgear A safe range of operating data, .

[0016] Furthermore, it is characterized in that the specific analysis method for dividing the safety level of the high-voltage switchgear is as follows: based on the obtained self-characteristic function index of each area of ​​the disconnector of the high-voltage switchgear and the coordinated operation function index of the disconnector of the high-voltage switchgear, when the self-characteristic function index of a certain area of ​​the disconnector of the high-voltage switchgear or the coordinated operation function index of the disconnector of the high-voltage switchgear is -1, the safety level of the high-voltage switchgear is recorded as level one, otherwise, it is recorded as level two.

[0017] Further, characterized in that, the insulation deterioration degree of the matched high-voltage switch equipment is detected according to the insulation deterioration degree, and the specific analysis method is that: the core index features of the high-voltage switch equipment are extracted, wherein the core index features include insulation resistance, partial discharge quantity and dielectric loss factor, and the core index features of the high-voltage switch equipment are respectively averaged to obtain the core index average feature values of the high-voltage switch equipment.

[0018] When the safety level of the high-voltage switch equipment is recorded as level one, and the core index average feature value of the high-voltage switch equipment is less than the core index average feature value threshold of the high-voltage switch equipment stored in the database, the insulation deterioration degree of the high-voltage switch equipment is recorded as serious deterioration, the operation is immediately stopped, emergency maintenance is carried out, and a warning prompt is issued, and if the core index average feature values of the high-voltage switch equipment are greater than the core index average feature value threshold of the high-voltage switch equipment stored in the database, the insulation deterioration degree of the high-voltage switch equipment is recorded as moderate deterioration, real-time discharge monitoring is carried out, and the number of partial discharges in the discharge detection is increased.

[0019] When the safety level of the high-voltage switch equipment is recorded as level two, and the core index average feature value of the high-voltage switch equipment is less than the core index average feature value threshold of the high-voltage switch equipment stored in the database, it is indicated that the insulation deterioration degree is slight deterioration, the discharge detection time is prolonged, and if the core index average feature values of the high-voltage switch equipment are greater than the core index average feature value threshold of the high-voltage switch equipment stored in the database, it is indicated that the insulation deterioration degree is no deterioration.

[0020] The second aspect of the application provides a system for performing the partial discharge detection method for evaluating the insulation deterioration degree of the power equipment, characterized in that, comprising: module one, performing contact appearance detection on the disconnecting switch of the high-voltage switch equipment through visual and image recognition technology to obtain three-dimensional topographic data, and then evaluating the self characteristic function index of each region of the disconnecting switch of the high-voltage switch equipment.

[0021] Module two, obtaining operation data by recording the operation sequence of the disconnecting switch and the circuit breaker, and evaluating the cooperative operation function index of the disconnecting switch of the high-voltage switch equipment.

[0022] Module three, based on the obtained self characteristic function index of each region of the disconnecting switch of the high-voltage switch equipment and the cooperative operation function index of the disconnecting switch of the high-voltage switch equipment, the safety level of the high-voltage switch equipment is divided, the insulation deterioration degree of the high-voltage switch equipment is matched, and the discharge detection is performed according to the insulation deterioration degree.

[0023] The beneficial effects of the present application are that: in step one and step two: the contact appearance of the disconnecting switch of the high-voltage switchgear is detected by visual and image recognition technology to obtain three-dimensional topographic data, avoid subjective judgment errors, realize quantitative analysis of parameters such as contact geometric shape and surface roughness, and further evaluate the self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear, the function index can be used to predict the electric field stress of the insulating medium in advance, provide key input for insulation deterioration degree evaluation, and obtain operation data by recording the operation sequence of the disconnecting switch and the circuit breaker, avoid the risk of arc discharge and insulation breakdown caused by incorrect operation sequence, reduce the cause of insulation deterioration from the source, evaluate the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, trace whether the insulation deterioration is caused by abnormal equipment linkage, provide direction for systematic fault troubleshooting, prevent further deterioration of the insulation material, and improve the reliability of the equipment operation.

[0024] In step three: based on the obtained self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear and the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, the safety level of the high-voltage switchgear is divided, the insulation deterioration degree of the high-voltage switchgear is matched, the discharge detection is carried out according to the insulation deterioration degree, the detection efficiency is improved, the operation and maintenance cost is reduced, the safe and stable operation ability of the power system is improved, the fault expansion is avoided, and the cascading failure is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The method embodiment of the present application is a flowchart of the implementation steps.

[0027] Figure 2 The system structure connection diagram of the present application is shown. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] REFERENCE Figure 1As shown, the application provides a partial discharge detection method for evaluating the insulation degradation degree of power equipment, comprising: step one, contact appearance detection of disconnecting switch of high-voltage switchgear is performed by visual and image recognition technology to obtain three-dimensional topographic data, and then the self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear is evaluated.

[0030] Step two, the operation sequence of the disconnecting switch and the circuit breaker is recorded to obtain operation data, and the cooperative operation function index of the disconnecting switch of the high-voltage switchgear is evaluated.

[0031] Step three, based on the self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear and the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, the safety level of the high-voltage switchgear is divided, the insulation degradation degree of the high-voltage switchgear is matched, and discharge detection is performed according to the insulation degradation degree.

[0032] In the above embodiment, the contact appearance detection of the disconnecting switch of the high-voltage switchgear by visual and image recognition technology has the following specific analysis method: an industrial-grade camera is used, a light supplement device is matched, a laser range finder and a three-dimensional structured light sensor are combined, and three-dimensional topographic data is obtained.

[0033] In the above embodiment, the evaluation of the self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear has the following specific analysis method: based on the obtained three-dimensional topographic data, the surface defect value, the mechanical deformation value and the contact contact value of each region of the disconnecting switch of the high-voltage switchgear are analyzed, and the self characteristic function index of each region of the disconnecting switch of the high-voltage switchgear is evaluated. The specific calculation formula is as follows: Wherein, represents the number of each region, , represents the number of regions, represents a logical symbol or, , and are the surface defect value safety interval, the mechanical deformation value safety interval and the contact contact value safety interval of each region of the disconnecting switch of the high-voltage switchgear, respectively.

[0034] It should be noted that the surface defect value, the mechanical deformation value and the contact contact value of each region of the disconnecting switch of the high-voltage switchgear reflect the integrity of insulation and mechanical structure, and the more serious the defect, the higher the risk of insulation failure and mechanical failure.

[0035] ​​It should be noted that Represents the logical non-symbol, indicating the negation of the proposition, Representation Proposition The negation, when This "or" relation proposition is true, that is, it satisfies Greater than ,or Greater than or Greater than When one of the conditions Assign a value of -1, when the above "or" relation proposition is negated True, that is, none of the three greater than conditions are met, Assign a value of 1 to construct "If a certain condition is met, Take a value, if it does not meet the condition and meets another associated condition A logical branch that takes another value.

[0036] In the above embodiment, it is characterized in that the surface defect value of each area of ​​the disconnector of the high-voltage switchgear is specifically analyzed by the following method: based on the obtained surface defect data, wherein the surface defect data includes: the number of corrosion spots, crack length, and burn area of ​​each area of ​​the disconnector of the high-voltage switchgear, and extracting the corrosion spot number safety interval, crack length safety interval, and burn area safety interval of the disconnector of the high-voltage switchgear from the database, the corrosion spot number, crack length, and burn area of ​​each area of ​​the disconnector of the high-voltage switchgear are compared with the corrosion spot number safety interval, crack length safety interval, and burn area safety interval of each area of ​​the disconnector of the high-voltage switchgear stored in the database. If the corrosion spot number of a certain area of ​​the disconnector of the high-voltage switchgear is not within the corrosion spot number safety interval, the crack length is not within the crack length safety interval, and the burn area is not within the burn area safety interval, then the surface defect value of the disconnector of the high-voltage switchgear is recorded as -1, otherwise it is recorded as 1, thereby obtaining the surface defect value of each area of ​​the disconnector of the high-voltage switchgear , The values ​​include -1 and 1.

[0037] It should be noted that the number of corrosion spots, crack length, and burnt area in each area of ​​the disconnector of the high-voltage switchgear were analyzed using edge detection technology. The increase in the number of corrosion spots in each area of ​​the disconnector of the high-voltage switchgear reduces the stability of the contact resistance and causes partial discharge. The crack length weakens the mechanical strength, creating a channel for moisture and dust to invade, accelerating insulation degradation. When the burnt area increases, the contact resistance increases, causing the metal on the contact surface to melt, resulting in insulation degradation and affecting partial discharge.

[0038] In the above embodiment, the mechanical deformation value of each region of the disconnecting switch of the high-voltage switchgear is analyzed in detail as follows: based on the obtained mechanical deformation data, wherein the mechanical deformation data includes the contact surface flatness and the contact gap distance of each region of the disconnecting switch of the high-voltage switchgear, and the contact surface flatness compliance interval and the contact gap distance compliance interval of each region of the disconnecting switch of the high-voltage switchgear are extracted from the database, the contact surface flatness and the contact gap distance of each region of the disconnecting switch of the high-voltage switchgear are compared with the contact surface flatness compliance interval and the contact gap distance compliance interval stored in the database, if the contact surface flatness of a certain region of the disconnecting switch of the high-voltage switchgear is not in the contact surface flatness compliance interval or the contact gap distance is not in the contact gap distance compliance interval, the mechanical deformation value of the region of the disconnecting switch of the high-voltage switchgear is recorded as -1, otherwise as 1, and then the mechanical deformation value of each region of the disconnecting switch of the high-voltage switchgear is obtained wherein, the value of the mechanical deformation value of each region of the disconnecting switch of the high-voltage switchgear includes -1 and 1.

[0039] It should be noted that the contact surface flatness and the contact gap distance of each region of the disconnecting switch of the high-voltage switchgear are obtained by structural laser scanning and three-dimensional reconstruction technology, and insufficient contact surface flatness of each region of the disconnecting switch of the high-voltage switchgear will cause local contact stress concentration, abnormal deformation during closing, and accelerated heating, and too small contact gap distance will cause excessive contact pressure during closing, causing excessive compression deformation of the contact area, even causing yield or fracture of the contact material, causing insulation deterioration, and affecting partial discharge.

[0040] In the above embodiment, the contact value of each region of the disconnecting switch of the high-voltage switchgear is analyzed in detail as follows: based on the obtained contact data, wherein the contact data includes the contact wear depth and the dust coverage rate of each region of the disconnecting switch of the high-voltage switchgear, and the contact wear depth compliance interval and the dust coverage rate compliance interval of the disconnecting switch of the high-voltage switchgear are extracted from the database for comparison, if the contact wear depth of each region of the disconnecting switch of the high-voltage switchgear is in the contact wear depth compliance interval and the dust coverage rate is in the dust coverage rate compliance interval, the contact value of the region of the disconnecting switch of the high-voltage switchgear is recorded as 1, otherwise as -1, and then the contact value of each region of the disconnecting switch of the high-voltage switchgear is obtained wherein, the value of the contact value of each region of the disconnecting switch of the high-voltage switchgear includes 1 and -1.

[0041] It should be noted that the contact wear depth and dust coverage of each area of the disconnecting switch of the high-voltage switchgear are obtained by target detection model technology analysis. Contact wear leads to a decrease in contact surface material, a reduction in effective conduction area, a decrease in contact point density, a significant increase in contact resistance, and an increase in dust coverage. Dust on the contact surface increases, forming an insulating or semi-insulating layer that hinders the conduction path, causing the contact resistance to increase in steps, resulting in insulation degradation and affecting partial discharge.

[0042] In the above embodiment, the evaluation of the cooperative operation function index of the disconnecting switch of the high-voltage switchgear is characterized in that the specific analysis method is based on the obtained operation data, including the opening delay time, operation time sequence deviation value, interlocking failure rate, and vibration speed of the disconnecting switch of the high-voltage switchgear, and the opening delay time safety interval, operation time sequence deviation value safety interval, interlocking failure rate safety interval, and vibration speed safety interval of the disconnecting switch of the high-voltage switchgear are extracted from the database to evaluate the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, and the specific calculation formula is: , represents the first operation data of the disconnecting switch of the high-voltage switchgear, represents the safety interval of the first operation data of the disconnecting switch of the high-voltage switchgear, .

[0043] It should be noted that the opening delay time, operation time sequence deviation value, interlocking failure rate, and vibration speed of the disconnecting switch of the high-voltage switchgear are obtained by high-precision time relay, multi-channel synchronous data acquisition system, historical interlocking failure record data center, and vibration sensor detection analysis. Excessive opening delay difference may lead to asymmetric system opening, increasing mechanical stress and insulation risk. Excessive operation time sequence deviation value may lead to load operation, causing short-circuit failure. Interlocking failure may lead to misoperation, directly causing personal injury or equipment damage. High vibration may accelerate the aging of insulation components, affecting electrical performance, causing insulation degradation, and affecting partial discharge.

[0044] In step one and step two: the contact appearance of the disconnecting switch of the high-voltage switchgear is detected by visual and image recognition technology to obtain three-dimensional topographic data, avoid subjective judgment errors, realize quantitative analysis of the contact geometric form, surface roughness and other parameters, and then evaluate the self-characteristic function index of each region of the disconnecting switch of the high-voltage switchgear. The function index can be used to predict the electric field stress of the insulating medium in advance, provide key input for insulating deterioration assessment, and record the operation sequence of the disconnecting switch and the circuit breaker to obtain operation data, avoid risks such as arc discharge and insulation breakdown caused by incorrect operation sequence, reduce the causes of insulation deterioration from the source, evaluate the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, trace whether the insulation deterioration is caused by abnormal equipment linkage, provide a direction for systematic fault troubleshooting, prevent further deterioration of the insulation material, and improve the reliability of the equipment operation.

[0045] In the above embodiment, the safety level of the high-voltage switchgear is divided, and the specific analysis method is: based on the self-characteristic function index of each region of the disconnecting switch of the high-voltage switchgear and the cooperative operation function index of the disconnecting switch of the high-voltage switchgear, when the self-characteristic function index of a certain region of the disconnecting switch of the high-voltage switchgear or the cooperative operation function index of the disconnecting switch of the high-voltage switchgear is -1, the safety level of the high-voltage switchgear is recorded as level one, otherwise, as level two.

[0046] In the above embodiment, the insulation deterioration degree of the high-voltage switchgear is matched, and the discharge detection is performed according to the insulation deterioration degree, and the specific analysis method is: extracting each core index feature of the high-voltage switchgear, wherein the core index feature includes insulation resistance, partial discharge quantity and dielectric loss factor, and averaging each core index feature of the high-voltage switchgear to obtain the average characteristic value of each core index of the high-voltage switchgear.

[0047] When the safety level of the high-voltage switchgear is recorded as level one, and the average characteristic value of a certain core index of the high-voltage switchgear is less than the average characteristic value threshold of the core index of the high-voltage switchgear stored in the database, the insulation deterioration degree of the high-voltage switchgear is recorded as serious deterioration, the operation is immediately stopped, the emergency repair is performed, and the warning prompt is issued. If the average characteristic value of each core index of the high-voltage switchgear is greater than the average characteristic value threshold of the core index of the high-voltage switchgear stored in the database, the insulation deterioration degree of the high-voltage switchgear is recorded as moderate deterioration, real-time discharge monitoring is performed, and the number of local discharge detection is increased.

[0048] When the safety level of the high-voltage switching device is recorded as level two, and the average characteristic value of the core index of the high-voltage switching device is less than the average characteristic value threshold of the core index of the high-voltage switching device stored in the database, it indicates that the insulation deterioration degree is slight deterioration, and the discharge detection time is prolonged, and if the average characteristic value of each core index of the high-voltage switching device is greater than the average characteristic value threshold of the core index of the high-voltage switching device stored in the database, it indicates that the insulation deterioration degree is no deterioration.

[0049] In step three: based on the obtained self-characteristic function index of each area of the disconnecting switch of the high-voltage switching device and the cooperative operation function index of the disconnecting switch of the high-voltage switching device, the safety level of the high-voltage switching device is divided, the insulation deterioration degree of the high-voltage switching device is matched, and the discharge detection is carried out according to the insulation deterioration degree, which improves the detection efficiency, reduces the operation and maintenance cost, improves the safe and stable operation ability of the power system, avoids the expansion of faults, and further avoids the chain failure.

[0050] Referring to Figure 2 As shown in the figure, the application provides a partial discharge detection method for evaluating the insulation deterioration degree of a power device, which is characterized by comprising: module one, contact appearance detection of the disconnecting switch of the high-voltage switching device is carried out through visual and image recognition technology, three-dimensional topographic data is obtained, and the self-characteristic function index of each area of the disconnecting switch of the high-voltage switching device is evaluated.

[0051] Module two, the operation sequence of the disconnecting switch and the circuit breaker is recorded to obtain operation data, and the cooperative operation function index of the disconnecting switch of the high-voltage switching device is evaluated.

[0052] Module three, based on the obtained self-characteristic function index of each area of the disconnecting switch of the high-voltage switching device and the cooperative operation function index of the disconnecting switch of the high-voltage switching device, the safety level of the high-voltage switching device is divided, the insulation deterioration degree of the high-voltage switching device is matched, and the discharge detection is carried out according to the insulation deterioration degree.

[0053] The above content is only an example and description of the concept of the application, and those skilled in the art can make various modifications, supplements or substitutions of the described specific embodiments using similar ways, as long as they do not deviate from the concept of the application or exceed the scope defined by the application, which should belong to the protection scope of the application.

Claims

1. A partial discharge detection method for evaluating the degree of insulation degradation of power equipment, characterized in that: include: Step 1: Use vision and image recognition technology to inspect the contact appearance of the disconnector of the high-voltage switchgear to obtain three-dimensional shape data, and then evaluate the characteristic function index of each area of ​​the disconnector of the high-voltage switchgear; Step 2: Obtain operation data by recording the operation sequence of the disconnector and the circuit breaker, and evaluate the coordinated operation function index of the disconnector of the high-voltage switchgear; Step 3: Based on the obtained characteristic function index of each area of ​​the disconnector of the high-voltage switchgear and the coordinated operation function index of the disconnector of the high-voltage switchgear, the safety level of the high-voltage switchgear is divided, the insulation degradation degree of the high-voltage switchgear is matched, and discharge detection is performed according to the insulation degradation degree.

2. The partial discharge detection method for evaluating the insulation degradation degree of electric power equipment according to claim 1, characterized in that: The specific analysis method of performing contact appearance inspection on the disconnector of the high-voltage switchgear by using vision and image recognition technology is as follows: An industrial-grade camera, a fill light device, a laser rangefinder and a 3D structured light sensor are used to obtain 3D shape data.

3. The partial discharge detection method for evaluating the insulation degradation degree of electric power equipment according to claim 1, characterized in that: The specific analysis method for evaluating the characteristic function index of each area of ​​the disconnector of the high-voltage switchgear is as follows: Based on the obtained 3D appearance data, which includes surface defect data, mechanical deformation data, and contact data, the surface defect values ​​of each area of ​​the disconnector of the high-voltage switchgear are analyzed. , mechanical deformation value and contact value , to evaluate the characteristic function index of each area of ​​the disconnector of the high-voltage switchgear, the specific calculation formula is: ,in, Indicates the number of each area, , Expressed as the number of regions, Represented as a logical symbol or, 、 and They are the surface defect value safety interval, mechanical deformation value safety interval and contact contact value safety interval of each area of ​​the disconnector of the high-voltage switchgear.

4. A partial discharge detection method for evaluating insulation degradation of power equipment according to claim 3, characterized in that: The specific analysis method of the surface defect value of each area of ​​the disconnector of the high-voltage switchgear is as follows: Based on the surface defect data obtained, wherein the surface defect data includes: the number of corrosion spots, crack length, and burn area of ​​each area of ​​the disconnector of the high-voltage switchgear, and the corrosion spot number safety interval, crack length safety interval, and burn area safety interval of the disconnector of the high-voltage switchgear are extracted from the database, and the corrosion spot number, crack length, and burn area of ​​each area of ​​the disconnector of the high-voltage switchgear are compared with the corrosion spot number safety interval, crack length safety interval, and burn area safety interval of each area of ​​the disconnector of the high-voltage switchgear stored in the database. If the corrosion spot number of a certain area of ​​the disconnector of the high-voltage switchgear is not within the corrosion spot number safety interval and the crack length is not within the crack length safety interval and the burn area is not within the burn area safety interval, then the surface defect value of the area of ​​the disconnector of the high-voltage switchgear is recorded as -1, otherwise it is recorded as 1, thereby obtaining the surface defect values ​​of each area of ​​the disconnector of the high-voltage switchgear. , The values ​​include -1 and 1.

5. The partial discharge detection method for evaluating the insulation degradation degree of electric power equipment according to claim 3, characterized in that: The specific analysis method of the mechanical deformation value of each area of ​​the disconnector of the high-voltage switchgear is as follows: Based on the obtained mechanical deformation data, wherein the mechanical deformation data includes: the contact surface flatness and contact gap distance of each area of ​​the disconnector of the high-voltage switchgear, and the contact surface flatness compliance interval and contact gap distance compliance interval of each area of ​​the disconnector of the high-voltage switchgear are extracted from the database, and the contact surface flatness and contact gap distance of each area of ​​the disconnector of the high-voltage switchgear are compared with the contact surface flatness compliance interval and contact gap distance compliance interval of each area of ​​the disconnector of the high-voltage switchgear stored in the database. If the contact surface flatness of a certain area of ​​the disconnector of the high-voltage switchgear is not within the contact surface flatness compliance interval or the contact gap distance is not within the contact gap distance compliance interval, the mechanical deformation value of the area of ​​the disconnector of the high-voltage switchgear is recorded as -1, otherwise it is recorded as 1, thereby obtaining the mechanical deformation value of each area of ​​the disconnector of the high-voltage switchgear. ,in, The values ​​include -1 and 1.

6. The partial discharge detection method for evaluating insulation degradation degree of electric power equipment according to claim 3, characterized in that: The specific analysis method of the contact value of each area of ​​the disconnector of the high-voltage switchgear is as follows: Based on the obtained contact contact data, the contact contact data includes: the contact wear depth and dust coverage rate of each area of ​​the disconnector of the high-voltage switchgear, and the contact wear depth compliance interval and the dust coverage rate compliance interval of the disconnector of the high-voltage switchgear are extracted from the database for comparison. If the contact wear depth of each area of ​​the disconnector of the high-voltage switchgear is within the contact wear depth compliance interval and the dust coverage rate is within the dust coverage rate compliance interval, the contact contact value of the area of ​​the disconnector of the high-voltage switchgear is recorded as 1, otherwise it is recorded as -1, thereby obtaining the contact contact value of each area of ​​the disconnector of the high-voltage switchgear. ,in, The values ​​include 1 and -1.

7. The partial discharge detection method for evaluating insulation degradation degree of electric power equipment according to claim 3, characterized in that: The specific analysis method for evaluating the coordinated operation function index of the disconnector of the high-voltage switchgear is as follows: Based on the obtained operating data, which includes: the opening delay time, operation sequence deviation value, interlock failure rate, and vibration speed of the disconnector of the high-voltage switchgear, the opening delay time safety interval, operation sequence deviation value safety interval, interlock failure rate safety interval, and vibration speed safety interval of the disconnector of the high-voltage switchgear are extracted from the database to evaluate the coordinated operation function index of the disconnector of the high-voltage switchgear. The specific calculation formula is: , Indicates the disconnector of high voltage switchgear Running data, Indicates the disconnector of high voltage switchgear A safe range of operating data, .

8. The partial discharge detection method for evaluating insulation degradation degree of electric power equipment according to claim 7, characterized in that: The specific analysis method for classifying the safety levels of high-voltage switchgear is as follows: Based on the obtained self-characteristic function index of each area of ​​the disconnector of the high-voltage switchgear and the coordinated operation function index of the disconnector of the high-voltage switchgear, when the self-characteristic function index of a certain area of ​​the disconnector of the high-voltage switchgear or the coordinated operation function index of the disconnector of the high-voltage switchgear is -1, the safety level of the high-voltage switchgear is recorded as level one, otherwise, it is recorded as level two.

9. A partial discharge detection method for evaluating insulation degradation of electric power equipment according to claim 8, characterized in that: The insulation degradation degree of the matching high-voltage switchgear is determined, and discharge detection is performed according to the insulation degradation degree. The specific analysis method is as follows: Extracting the core indicator characteristics of the high-voltage switchgear, where the core indicator characteristics include insulation resistance, partial discharge, and dielectric loss factor, and averaging the core indicator characteristics of the high-voltage switchgear to obtain the average characteristic value of each core indicator of the high-voltage switchgear; When the safety level of the high-voltage switchgear is recorded as level one, and the average characteristic value of a core indicator of the high-voltage switchgear is less than the average characteristic value threshold of a core indicator of the high-voltage switchgear stored in the database, the insulation degradation degree of the high-voltage switchgear is recorded as severe degradation, and the operation is immediately stopped, emergency maintenance is carried out, and an early warning prompt is issued. If the average characteristic value of each core indicator of the high-voltage switchgear is greater than the average characteristic value threshold of a core indicator of the high-voltage switchgear stored in the database, the insulation degradation degree of the high-voltage switchgear is recorded as moderate degradation, real-time discharge monitoring is carried out, and the number of discharge detection areas is increased; When the safety level of the high-voltage switchgear is recorded as level two, and the average characteristic value of a core indicator of the high-voltage switchgear is less than the average characteristic value threshold of a core indicator of the high-voltage switchgear stored in the database, it means that the degree of insulation degradation is slightly degraded, and the discharge detection time is extended. If the average characteristic value of each core indicator of the high-voltage switchgear is greater than the average characteristic value threshold of a core indicator of the high-voltage switchgear stored in the database, it means that the degree of insulation degradation is no degradation.

10. A system for executing the partial discharge detection method for evaluating insulation degradation degree of electric power equipment according to any one of claims 1 to 9, characterized in that: include: Module 1: Use vision and image recognition technology to inspect the contact appearance of the disconnector of high-voltage switchgear, obtain three-dimensional topography data, and then evaluate the characteristic function index of each area of ​​the disconnector of the high-voltage switchgear; Module 2: By recording the operating sequence of the disconnector and circuit breaker, the operating data is obtained to evaluate the coordinated operation function index of the disconnector of the high-voltage switchgear; Module 3: Based on the obtained characteristic function index of each area of ​​the disconnector of the high-voltage switchgear and the coordinated operation function index of the disconnector of the high-voltage switchgear, the safety level of the high-voltage switchgear is divided, the insulation degradation degree of the high-voltage switchgear is matched, and discharge detection is performed according to the insulation degradation degree.

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