Porcelain insulator string degradation detection method and system based on radial electric field change

Abstract

The invention belongs to the field of insulators, and particularly relates to a porcelain insulator string degradation detection method and system based on radial electric field change, and the method comprises the steps: carrying out the simulation of a three-dimensional electrostatic field model of a porcelain insulator string; obtaining a radial electric field distribution curve of the undegraded porcelain insulator string; obtaining a radial electric field distribution curve when a zero-value insulator exists in the degraded insulator string; comparing the radial electric field distribution curves of the undegraded porcelain insulator string and the degraded porcelain insulator string, and classifying different parts according to a high-voltage end part and a low-voltage end part during comparison; a plurality of simulation comparison data of an undegraded porcelain insulator string and a degraded porcelain insulator string with a zero-value insulator are obtained, a high-voltage end fault or a low-voltage end fault can be distinguished at a time through a radial electric field distribution curve, then the zero-value insulator sheet is positioned through a field intensity difference value, and meanwhile, the zero-value insulator sheet can be accurately positioned. And the degradation degree of the insulator can be analyzed through the field intensity difference value, so that maintenance personnel can know the degradation amplitude of the insulator conveniently, and subsequent maintenance is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of insulators, and in particular relates to a method and a system for detecting degradation of a porcelain insulator string based on radial electric field changes. Background Art

[0002] At present, the insulators used on the lines are mainly divided into three types according to the materials: porcelain insulators, composite insulators, and tempered glass insulators. On the one hand, insulators are inevitably bumped or even damaged during production, transportation, and installation, resulting in some minor local degradation. On the other hand, with the increase of service life, the electrical and mechanical properties of some insulators exposed to the outdoors will decline to varying degrees. Cracks may appear on porcelain insulators, and the insulation performance may be lost, becoming low-value or zero-value insulators.

[0003] The degradation of porcelain insulators is manifested as a decrease in local resistance (low value or zero value), which is inevitably accompanied by a redistribution of surface voltage and the electric field inside and outside the insulator. There is a correlation between the degradation of porcelain insulators and the changes in the radial electric field in the space around them. There is currently a lack of means to characterize the degradation of porcelain insulators by measuring the changes in the radial electric field. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a porcelain insulator string degradation detection method and system based on radial electric field changes, which has the characteristics of quickly judging whether the porcelain insulator string fault is located at the high and low voltage ends and quickly locating the number of degraded insulator pieces.

[0005] The present invention adopts the following technical solution.

[0006] The present invention provides a method for detecting degradation of a porcelain insulator string based on radial electric field changes, which is characterized by comprising:

[0007] Conduct three-dimensional electrostatic field model simulation of porcelain insulator string;

[0008] Obtain the radial electric field distribution curve of the non-degraded porcelain insulator string;

[0009] Obtain the radial electric field distribution curve when there are zero-value insulators in the deteriorated insulator string;

[0010] Compare the radial electric field distribution curves of the non-degraded porcelain insulator string and the degraded porcelain insulator string, and classify the difference parts into high-voltage end part and low-voltage end part during the comparison;

[0011] The field strength difference corresponding to the number of insulator pieces at the high voltage end and the low voltage end is obtained as a reference field strength difference, and the reference field strength difference is entered into a reference database according to the number of insulator pieces;

[0012] Obtain the radial electric field distribution curve of the porcelain insulator string to be tested, determine whether there is a difference between the high-voltage end and the low-voltage end after comparison, and obtain the actual field strength difference;

[0013] The number of faulty insulators is confirmed by comparing the reference field strength difference in the reference database with the actual field strength difference.

[0014] Preferably, the simulating the three-dimensional electrostatic field model of the porcelain insulator string includes generating a three-dimensional electrostatic field model according to the voltage of the transmission line and the specifications of the porcelain insulator string to be tested.

[0015] Preferably, the three-dimensional electrostatic field model includes a non-degraded porcelain insulator string model and a degraded porcelain insulator string model when any insulator piece is a zero-value insulator; the number of pieces in the degraded porcelain insulator string is the same as the number of pieces in the non-degraded porcelain insulator string, the number of insulator pieces in the porcelain insulator string is N, and a total of N+1 porcelain insulator string models are generated.

[0016] Preferably, the three-dimensional electrostatic field model simulation includes: using a photoelectric field sensor based on photoelectric sensing technology to obtain a radial electric field distribution curve within 5CM and a radial electric field distribution curve within 10CM around the porcelain insulator string.

[0017] Preferably, the high-voltage end portion of the porcelain insulator string is close to the transmission line tower end, and the low-voltage end portion is far away from the transmission line tower end.

[0018] Preferably, the number of the porcelain insulator strings is N;

[0019] When N is an odd number, the high voltage end insulator number is The low voltage end insulator number is

[0020] When N is an even number, the high voltage end insulator number is The low voltage end insulator number is

[0021] Preferably, when the actual field strength difference of the insulator is greater than the reference field strength difference, the insulator is determined to be a zero-value insulator.

[0022] Preferably, when the actual field strength difference of the insulator is less than the reference field strength difference, the degradation ratio parameter of the insulator piece is obtained by the ratio of the actual field strength difference to the reference field strength difference.

[0023] Preferably, insulators with simulated degradation degrees of 20%, 40%, 60% and 80% are used to replace any zero-value insulator in the three-dimensional electrostatic field model, radial electric field distribution curves of porcelain insulators at different degradation degrees are obtained, and reference field strength differences of insulators at different degradation degrees are obtained, which are used to compare with the actual field strength difference to confirm the degradation degree of the insulator to be tested.

[0024] The present invention also provides a porcelain insulator string degradation detection system based on radial electric field changes, the system is the system used for the aforementioned porcelain insulator string degradation detection system based on radial electric field changes, comprising:

[0025] The three-dimensional electrostatic field simulation module is used to build a model of a non-degraded porcelain insulator string and a model of a degraded porcelain insulator string when any insulator segment is a zero-value insulator;

[0026] A reference database module, used to store reference field strength differences between a non-degraded porcelain insulator string model and a degraded porcelain insulator string model;

[0027] The degradation degree judgment module is used to judge the degradation degree of the porcelain insulator string to be tested.

[0028] The beneficial effect of the present invention is that, compared with the prior art, multiple simulation comparison data of non-degraded porcelain insulator strings and degraded porcelain insulator strings with zero-value insulators are obtained, and the high-voltage end or low-voltage end fault can be distinguished once through the radial electric field distribution curve, and the zero-value insulator piece can be located subsequently through the field strength difference. At the same time, the degree of insulator degradation can be analyzed through the field strength difference, which is convenient for maintenance personnel to understand the extent of insulator degradation and facilitate subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic flow chart of a method for detecting degradation of a porcelain insulator string based on radial electric field changes in the present invention;

[0030] Figure 2 This is a schematic diagram of the electric field distribution at 5 cm around the non-degraded porcelain insulator string in the present invention;

[0031] Figure 3 This is a schematic diagram of the electric field distribution at 10 cm around the non-degraded porcelain insulator string in the present invention;

[0032] Figure 4 This is a schematic diagram of the electric field distribution at 5 cm around the low-voltage end of the porcelain insulator string in the present invention when the first piece is a zero-value insulator;

[0033] Figure 5 This is a schematic diagram of the electric field distribution at 10 cm around the low-voltage end of the porcelain insulator string in the present invention when the first piece is a zero-value insulator;

[0034] Figure 6 It is a schematic diagram of the electric field distribution at 5 cm around when the second piece at the low-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0035] Figure 7 This is a schematic diagram of the electric field distribution at 10 cm around the second piece of the low-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0036] Figure 8 This is a schematic diagram of the electric field distribution at 5 cm around the low-voltage end of the porcelain insulator string in the present invention when the third piece is a zero-value insulator;

[0037] Fig. 9 This is a schematic diagram of the electric field distribution at 10 cm around the low-voltage end of the porcelain insulator string in the present invention when the third piece is a zero-value insulator;

[0038] Fig.10 This is a schematic diagram of the electric field distribution at 5 cm around the high-voltage end of the porcelain insulator string in the present invention when the first piece is a zero-value insulator;

[0039] Fig.11 This is a schematic diagram of the electric field distribution at 10 cm around the high-voltage end of the porcelain insulator string in the present invention when the first piece is a zero-value insulator;

[0040] Fig.12 This is a schematic diagram of the electric field distribution at 5 cm around the second piece of the high-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0041] Fig.13 This is a schematic diagram of the electric field distribution at 10 cm around the second piece of the high-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0042] Fig.14 This is a schematic diagram of the electric field distribution at 5 cm around the third piece of the high-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0043] Fig.15 This is a schematic diagram of the electric field distribution at 10 cm around the third piece of the high-voltage end of the porcelain insulator string in the present invention is a zero-value insulator;

[0044] Fig.16 It is a schematic diagram of the electric field distribution at 5 cm around when the middle piece of the porcelain insulator string in the present invention is a zero-value insulator;

[0045] Fig.17 This is a schematic diagram of the electric field distribution at 10 cm around when the middle piece of the porcelain insulator string in the present invention is a zero-value insulator; DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0047] like Figure 1As shown, embodiment 1 of the present invention provides a method for detecting degradation of a porcelain insulator string based on radial electric field changes, comprising the following steps:

[0048] S101, performing a three-dimensional electrostatic field model simulation of a porcelain insulator string;

[0049] A three-dimensional electrostatic field model is generated according to the voltage of the transmission line and the specifications of the porcelain insulator string to be tested. The three-dimensional electrostatic field model includes a non-degraded porcelain insulator string model and a degraded porcelain insulator string model when any insulator piece is a zero-value insulator.

[0050] It should be added that the number of pieces in the degraded porcelain insulator string is the same as the number of pieces in the non-degraded porcelain insulator string, the number of insulator pieces in the porcelain insulator string is N, and a total of N+1 porcelain insulator string models are generated.

[0051] S102, obtaining a radial electric field distribution curve of a non-degraded porcelain insulator string, simulating a non-degraded porcelain insulator string model, applying a voltage that is the same as that of the transmission line at the high-voltage end of the insulator string as a restriction condition, obtaining the electric field inside the porcelain insulator string and in the air around it for analysis, thereby obtaining a non-degraded radial electric field distribution curve of the non-degraded porcelain insulator string model;

[0052] S103, obtaining a radial electric field distribution curve when a zero-value insulator exists in a degraded insulator string;

[0053] There are N situations when there are zero-value insulators in the degraded insulator string. By using the same simulation analysis method, radial electric field distribution curves of the degraded model including N situations can be obtained.

[0054] The first piece is a zero-value insulator, corresponding to the radial electric field distribution curve of the degradation model in the first case;

[0055] The Nth piece is a zero-value insulator, corresponding to the radial electric field distribution curve of the degradation model of the Nth case.

[0056] In order to obtain the changes of radial electric field distribution curves in different spatial ranges, further, the three-dimensional electrostatic field model includes during simulation: obtaining the radial electric field distribution curves in the space within 5CM and the radial electric field distribution curves in the space within 10CM around the porcelain insulator string.

[0057] 5CM and 10CM correspond to the parallel distance between the detection device and the radial part of the porcelain insulator string during normal detection. Although there are differences in field strength at different detection distances, the ratio of the field strength of the degraded part to the field strength of the non-degraded part is constant. Obtaining two sets of curves can increase the amount of reference data for subsequent field strength difference comparison and increase the accuracy of the simulation samples.

[0058] S104, comparing radial electric field distribution curves of a non-degraded porcelain insulator string and a degraded porcelain insulator string, and classifying the difference portion into a high-voltage end portion and a low-voltage end portion during the comparison;

[0059] When classifying the high-voltage end and the low-voltage end, the complete radial electric field distribution curve can be divided into two curves except for the middle insulator. When confirming the fault, only the high-voltage end part or the low-voltage end part where the difference is located is retained, which reduces the data processing volume of the comparison process and facilitates the subsequent confirmation of the deterioration position of the porcelain insulator string to be tested based on high and low voltage detection.

[0060] It should be noted that in the suspension insulator string, the high-voltage end refers to the part of the porcelain insulator string close to the tower side, and the low-voltage end refers to the porcelain insulator string far from the tower side;

[0061] In the tension insulator string, due to different design principles and installation methods, the division of high and low voltage ends is also different; generally speaking, the first tension insulator close to the tower side is the high voltage end, and the last tension insulator far from the tower side is the low voltage end;

[0062] Among them, the high-voltage end of the porcelain insulator string is close to the transmission line tower end, and the low-voltage end is far away from the transmission line tower end. The division of high and low voltage ends is to better describe the electric field distribution and current flow direction in the transmission line.

[0063] S105, respectively obtaining the field strength difference corresponding to the number of insulator pieces at the high voltage end part and the low voltage end part as the reference field strength difference, and entering the reference field strength difference into the reference database according to the number of insulator pieces;

[0064] It can be understood that after the curves of the high-voltage end and the low-voltage end are distinguished, the field strength difference of the zero-value insulators in the high-voltage end and the field strength difference of the zero-value insulators in the low-voltage end can be obtained by comparing the specific difference parts of the high-voltage end or the low-voltage end.

[0065] When the number of porcelain insulator strings is N;

[0066] In one embodiment, when N is an odd number, the high voltage end insulators are numbered as follows: The low voltage end insulator number is

[0067] When N is an even number, the high voltage end insulator number is The low voltage end insulator number is

[0068] The reference field strength difference is obtained when the high-voltage end part and the low-voltage end part are numbered and each zero-value insulator is arranged in sequence. Whether the middle part is a zero-value insulator has no actual effect on the radial electric field distribution curve.

[0069] S106, obtaining a radial electric field distribution curve of the porcelain insulator string to be tested, determining whether there is a difference between the high-voltage end and the low-voltage end after comparison, and obtaining an actual field strength difference;

[0070] It should be noted that the radial electric field distribution curve of the porcelain insulator string to be tested is obtained by the "photoelectric field sensor" based on photoelectric sensing technology. Since the insulation resistance of the porcelain insulator string decreases when its performance deteriorates, its surface voltage and internal and external electric fields are redistributed, the degradation of the insulator can be characterized by means of electric field measurement. According to electromagnetic field theory, the changing electric field is accompanied by a changing magnetic field. At this time, a time-varying electromagnetic field will be generated around the insulator, and the insulator is equivalent to an irregularly shaped inhomogeneous dielectric. At this time, the insulation resistance is still high, and only a very weak leakage current flows through, which will not have a significant impact on the electric field distribution and can be ignored. The characteristic detection problem of the insulator can be equivalent to solving the problem of solving the electric field distribution of irregular and inhomogeneous dielectrics in a time-varying electromagnetic field.

[0071] The photoelectric field sensor does not need to directly contact the insulator string and is not affected by the surrounding complex electromagnetic environment. It realizes the optical reflection of the insulator field strength through a primary photoelectric effect, thereby obtaining the radial electric field distribution curve of the porcelain insulator string to be tested.

[0072] During the first judgment, the difference in the curves can be used to determine whether the faulty insulator is at the high voltage end or the low voltage end.

[0073] S107. Confirm the number of faulty insulators by comparing the reference field strength difference in the reference database with the actual field strength difference.

[0074] As a comparative example: the reference field strength difference obtained is a standard parameter. When the actual field strength difference is greater than the reference field strength difference, the insulator is a zero-value insulator. When the actual field strength difference is equal to the reference field strength difference, it is also a zero-value insulator. When the actual field strength difference is less than the reference field strength difference, although there is no zero-value insulator, there is a risk of insulator degradation. The degree of degradation of the insulator piece can be obtained by the ratio of the actual field strength difference to the reference field strength difference.

[0075] When judging the specific insulator piece, first make a preliminary confirmation of the position of the single-piece zero-value insulator;

[0076] When there are multiple zero-value insulators:

[0077] The two adjacent pieces will directly show continuous field strength curve changes in the curve, which can confirm the two adjacent pieces;

[0078] There is no difference between non-adjacent multiple pieces and single piece when there are zero-value insulators.

[0079] In Example 2, insulators with degradation degrees of 20%, 40%, 60% and 80% are simulated to replace any zero-value insulator in the three-dimensional electrostatic model, and radial electric field distribution curves of porcelain insulators at different degradation degrees are obtained. The reference field strength difference of insulators with different degradation degrees is obtained, which is used to compare with the actual field strength difference to confirm the degradation degree of the insulator to be tested. The degradation degree of the insulator to be tested can be pre-recorded, and in subsequent inspections, insulators with hidden dangers are replaced first.

[0080] like Figure 2 , 3 As shown, the electric field component at the insulators at the head and tail ends of the porcelain insulator string is negative (positive upward), and its value is much larger than that at other insulators. The radial electric field distribution diagram is an inverted U shape as a whole, and the radial electric field intensity at the high-voltage end is slightly higher than that at the low-voltage end.

[0081] Take the high voltage end part, low voltage end part and middle part as an example, there are zero value insulators according to the number:

[0082] like Figure 4 , 5 As shown in the figure, when the first piece at the low voltage end is a zero-value insulator, the radial electric field at 5cm and 10cm is Figure 2 In contrast, the radial electric field norm at the end increases slightly, but the difference in the electric field norm at both ends increases significantly.

[0083] like Figure 6 , 7 As shown, when the second piece at the low-voltage end is zero value, the radial electric field at the head and tail is almost the same as that of the intact insulator, but the radial electric field at the second insulator at the low-voltage end changes significantly, and the top angle on the right side of the radial electric field distribution line is flattened.

[0084] like Figure 8 , 9 As shown, when the third piece at the low-voltage end is at zero value, its radial electric field distribution is very similar to the radial electric field distribution of the intact porcelain insulator string, with no obvious difference.

[0085] like Fig.10 , 11 As shown, when the first piece at the high-voltage end is zero value, the radial electric field distribution is very different from the radial electric field distribution of the intact porcelain insulator string. There are obvious differences everywhere, and the radial electric field difference at the head and tail ends is very small.

[0086] like Fig.12 , 13 As shown, when the second piece at the high-voltage end is at zero value, the radial electric field difference between the head and tail ends is further reduced and is almost the same.

[0087] like Fig.14 , 15As shown, when the third piece at the high-voltage end is zero value, the overall trend is similar to the radial electric field distribution of the intact porcelain insulator string. The biggest difference is that the radial electric field at the left top corner (near the third piece) is significantly reduced.

[0088] like Fig.16 , 17 As shown, the middle piece is located in the middle of the porcelain insulator string. If the value here is zero, the radial electric field distribution around the porcelain insulator string will remain almost unchanged from when it is intact.

[0089] In summary,

[0090] 1. When there are zero-value insulators in the first two pieces at the high-voltage end of the porcelain insulator string, the radial electric field within 5-10cm around it becomes stronger as a whole, and the difference in radial electric field strength between the head and the tail is significantly reduced;

[0091] 2. When there are zero-value insulators in the first two pieces at the low-voltage end of the porcelain insulator string, the radial electric field within 5-10 cm around it becomes stronger as a whole, and the difference in radial electric field strength at the head and tail ends is significantly reduced (the high-voltage end becomes larger and the ground end decreases);

[0092] 3. When the third piece in the porcelain insulator string (corresponding to the vertex angle of the radial electric field distribution curve) is a zero-value insulator, the radial electric field at the corresponding position decreases (the vertex angle becomes flat);

[0093] 4. When there is a zero-value insulator in the middle of the porcelain insulator string, the radial electric field within 5-10 cm around it remains almost unchanged;

[0094] 5. Compared with intact porcelain insulator strings, when there are zero-value insulators in the string, the radial electric field changes around them are uncertain, some increase, some decrease, and some remain almost unchanged; when zero-value insulators appear in the first two pieces at the head and tail ends, the radial electric field changes at the non-zero-value insulators will also change significantly. Although it is impossible to determine whether it is a zero-value insulator by measuring the electric field around a certain point or a piece of insulator alone; it is possible to determine whether there are zero-value insulators at the head and tail ends by measuring the electric field distribution of the entire string of porcelain insulators, and then find the number of faulty insulators based on the field strength difference.

[0095] Embodiment 3 of the present invention provides a porcelain insulator string degradation detection system based on radial electric field changes, the system is the system used for the aforementioned porcelain insulator string degradation detection system based on radial electric field changes, comprising:

[0096] The three-dimensional electrostatic field simulation module is used to build a model of a non-degraded porcelain insulator string and a model of a degraded porcelain insulator string when any insulator segment is a zero-value insulator;

[0097] A reference database module, used to store reference field strength differences between a non-degraded porcelain insulator string model and a degraded porcelain insulator string model;

[0098] The degradation degree judgment module is used to judge the degradation degree of the porcelain insulator string to be tested.

[0099] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0100] The beneficial effect of the present invention is that, compared with the prior art, multiple simulation comparison data of non-degraded porcelain insulator strings and degraded porcelain insulator strings with zero-value insulators are obtained, and the high-voltage end or low-voltage end fault can be distinguished once through the radial electric field distribution curve, and the zero-value insulator piece can be located subsequently through the field strength difference. At the same time, the degree of insulator degradation can be analyzed through the field strength difference, which is convenient for maintenance personnel to understand the extent of insulator degradation and facilitate subsequent maintenance.

[0101] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0102] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0103] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0104] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting porcelain insulator string degradation based on radial electric field changes, characterized in that: include: Conduct three-dimensional electrostatic field model simulation of porcelain insulator string; Obtain the radial electric field distribution curve of the non-degraded porcelain insulator string; Obtain the radial electric field distribution curve when there are zero-value insulators in the deteriorated insulator string; Compare the radial electric field distribution curves of the non-degraded porcelain insulator string and the degraded porcelain insulator string, and classify the difference parts into high-voltage end part and low-voltage end part during the comparison; The field strength difference corresponding to the number of insulator pieces at the high voltage end and the low voltage end is obtained as a reference field strength difference, and the reference field strength difference is entered into a reference database according to the number of insulator pieces; Obtain the radial electric field distribution curve of the porcelain insulator string to be tested, determine whether there is a difference between the high-voltage end and the low-voltage end after comparison, and obtain the actual field strength difference; The number of faulty insulators is confirmed by comparing the reference field strength difference in the reference database with the actual field strength difference.

2. The method for detecting degradation of a porcelain insulator string based on radial electric field changes according to claim 1, characterized in that: The three-dimensional electrostatic field model simulation of the porcelain insulator string includes generating a three-dimensional electrostatic field model according to the voltage of the transmission line and the specifications of the porcelain insulator string to be detected.

3. The method for detecting porcelain insulator string degradation based on radial electric field change according to claim 2, characterized in that: The three-dimensional electrostatic field model includes a non-degraded porcelain insulator string model and a degraded porcelain insulator string model when any insulator piece is a zero-value insulator; the number of pieces of the degraded porcelain insulator string is the same as the number of pieces of the non-degraded porcelain insulator string, the number of insulator pieces of the porcelain insulator string is N, and a total of N+1 porcelain insulator string models are generated.

4. The method for detecting porcelain insulator string degradation based on radial electric field variation according to claim 3 is characterized in that: The three-dimensional electrostatic field model simulation includes: using a photoelectric field sensor based on photoelectric sensing technology to obtain a radial electric field distribution curve within 5CM and a radial electric field distribution curve within 10CM around a porcelain insulator string.

5. The method for detecting porcelain insulator string degradation based on radial electric field change according to claim 4, characterized in that: The high-voltage end of the porcelain insulator string is close to the transmission line tower end, and the low-voltage end is far away from the transmission line tower end.

6. The method for detecting porcelain insulator string degradation based on radial electric field variation according to claim 5, characterized in that: The number of the porcelain insulator strings is N; When N is an odd number, the high voltage end insulator number is The low voltage end insulator number is When N is an even number, the high voltage end insulator number is The low voltage end insulator number is 7. The method for detecting porcelain insulator string degradation based on radial electric field variation according to claim 6, characterized in that: When the actual field strength difference of the insulator is greater than the reference field strength difference, the insulator is determined to be a zero-value insulator.

8. The method for detecting porcelain insulator string degradation based on radial electric field variation according to claim 7, characterized in that: When the actual field strength difference of the insulator is less than the reference field strength difference, the degradation ratio parameter of the insulator piece is obtained through the ratio of the actual field strength difference to the reference field strength difference.

9. The method for detecting porcelain insulator string degradation based on radial electric field variation according to claim 8, characterized in that: Insulators with simulated degradation degrees of 20%, 40%, 60% and 80% are used to replace arbitrary zero-value insulators in the three-dimensional electrostatic field model, and the radial electric field distribution curves of porcelain insulators at different degradation degrees are obtained. The reference field strength difference of insulators with different degradation degrees is obtained, which is used to compare with the actual field strength difference to confirm the degradation degree of the insulator to be tested.

10. A porcelain insulator string degradation detection system based on radial electric field changes, the system being a porcelain insulator string degradation detection system based on radial electric field changes as claimed in any one of claims 1 to 9, characterized in that: include: The three-dimensional electrostatic field simulation module is used to build a model of a non-degraded porcelain insulator string and a model of a degraded porcelain insulator string when any insulator segment is a zero-value insulator; A reference database module, used to store reference field strength differences between a non-degraded porcelain insulator string model and a degraded porcelain insulator string model; The degradation degree judgment module is used to judge the degradation degree of the porcelain insulator string to be tested.

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