Method for testing the insulating properties of a cable sheath material coated with an anti-bird pecking material

Abstract

The present application belongs to the technical field of insulation performance detection, and provides a cable sheath material insulation performance detection method coated with bird pecking prevention material.The present application evaluates the maximum pecking strength that the cable sample can withstand through simulation of bird pecking test, evaluates the bird expelling ability of the cable sample through field cable hanging test, and obtains the bird prevention ability of the cable sample.According to the change of the insulation performance of the cable sheath material obtained by detection, the change of the cable insulation performance in the case of bird pecking behavior and the case of no bird pecking is analyzed through the data collected by field cable hanging test, the cable insulation performance change data generated by bird pecking behavior is focused on, and with the increase of the number of bird pecking, the increase amplitude of the damage degree of the cable insulation performance with the increase of the number of bird pecking is evaluated, the influence of bird pecking behavior on the cable insulation performance is accurately obtained, and then a more accurate and more meaningful cable sheath bird pecking prevention ability can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulation performance detection, and particularly relates to a method for detecting insulation performance of cable sheath material coated with bird pecking prevention material. BACKGROUND

[0002] A cable is usually composed of several or several groups of mutually insulated wires and an outer insulating protective layer, and is an electric power or signal transmission device. As an important part of the power system, the cable needs to be ensured to operate safely and stably. The outer insulating layer of the cable is the core guarantee for the safe operation of the cable, and damage to the insulation performance of the outer insulating layer of the cable may cause short circuit, electric leakage, equipment burning and even fire accidents, so the insulation performance of the outer insulating layer of the cable needs to be strictly monitored and guaranteed.

[0003] Usually, the cable is deployed in the open air in the natural environment, which causes the cable to become a resting place for wild birds. The pecking, biting and clawing behaviors of wild birds on the cable will damage the cable insulating sheath and affect its insulation performance. Therefore, the cable sheath coated with a special smell material containing methyl o-aminobenzoate, which is repulsive to birds, is often used to prevent birds from staying on the cable and pecking and biting the cable, which will damage the insulation performance of the cable. On the other hand, an appropriate amount of resin, barium sulfate, curing agent and other materials are added during the preparation of the sheath, which can further strengthen the hardness of the cable sheath and form a physical barrier with high hardness. Even if the special chemical smell material added fails, it can still ensure that the bird pecking behavior cannot damage the cable sheath.

[0004] Because the natural environment in different regions and the species, number and activity range of birds in different regions will be different, it is necessary to evaluate the actual bird pecking prevention ability of the cable sheath. The prior art usually tests the bird pecking prevention ability of the cable sample by comparing the simulation test with the actual cable hanging, so as to obtain the frequency and severity of the cable sample pecked by birds within a period of time, and evaluate the bird pecking prevention ability of the cable sheath. However, in the actual cable hanging, the pecking position and force of the birds are random, which is different from the fixed-point and same-force pecking in the simulation test, and the result obtained by directly comparing the data of the two is less accurate. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a method for detecting insulation performance of cable sheath material coated with bird pecking prevention material.

[0006] According to the method for detecting insulation performance of cable sheath material coated with bird pecking prevention material provided by the present application, the method comprises the following steps.

[0007] The cable sample is subjected to simulated bird pecking test and field hanging cable test, simulated insulation performance data after each pecking under different pecking forces in the simulated bird pecking test is recorded, and the cable pecking condition and field insulation performance data in the field hanging cable test are recorded;

[0008] In the simulated bird pecking test, based on the simulated insulation performance data, the critical point of the simulated pecking times under each pecking force is analyzed, and the maximum pecking strength that the cable sample can withstand is evaluated in combination with the pecking force;

[0009] In the field hanging cable test, based on the cable pecking condition and the field insulation performance data, the influence of environmental factors on the field insulation performance data is analyzed in combination with the simulated insulation performance data, the field insulation performance data is corrected by removing the environmental influence factors, the environmental influence correction value is obtained, and the cable sample is evaluated for the expulsion ability to birds;

[0010] In combination with the maximum pecking strength and the expulsion ability, the anti-bird ability of the cable sample is obtained.

[0011] In some embodiments of the present application, in the simulated bird pecking test, based on the simulated insulation performance data, the critical point of the simulated pecking times under each pecking force is analyzed, and the maximum pecking strength that the cable can withstand is evaluated in combination with the pecking force, including:

[0012] In the simulated bird pecking test, based on the simulated insulation performance data, the bird pecking damage degree caused by each pecking to the cable insulation performance is analyzed, and the damage improvement degree caused by each pecking compared with the last pecking is analyzed, and the total bird pecking damage degree caused by each pecking to the cable insulation performance is analyzed, to obtain the simulated critical point characteristics of each pecking under each pecking force;

[0013] According to the simulated critical point characteristics, in combination with the pecking force, the maximum pecking strength that the cable can withstand is evaluated.

[0014] In some embodiments of the present application, in the simulated bird pecking test, based on the simulated insulation performance data, the bird pecking damage degree caused by each pecking to the cable insulation performance is analyzed, including:

[0015] In the simulated bird pecking test, according to the simulated insulation performance data after each pecking under different pecking forces, the difference between the simulated insulation performance data after each pecking and the previous pecking is calculated, to obtain the bird pecking damage degree caused by each pecking to the cable insulation performance under different pecking forces, and to obtain the maximum bird pecking damage degree caused by all peckings to the cable insulation performance under all pecking forces.

[0016] In some embodiments of the present invention, in a simulated bird pecking test, based on the simulated insulation performance data, the degree of damage improvement caused by each peck compared to the previous peck is analyzed, including:

[0017] In the simulated bird pecking test, based on the degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces, the difference between the degree of bird pecking damage after each pecking and the corresponding degree of bird pecking damage after the previous pecking is calculated, so as to obtain the degree of damage improvement caused by each pecking under different pecking forces compared to the previous pecking.

[0018] In some embodiments of the present invention, in simulated bird-pecking tests, based on the simulated insulation performance data, the total degree of bird-pecking damage to the cable insulation performance after each peck is analyzed, including:

[0019] In the simulated bird pecking test, based on the degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces, the cumulative damage value of the bird pecking damage degree corresponding to each pecking and all previous pecking is calculated, so as to obtain the total degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces.

[0020] In some embodiments of the present invention, the maximum bite strength that the cable can withstand is evaluated based on the simulated critical point characteristic degree and the bite force, including:

[0021] The maximum value of the simulated critical point characteristic of all pecking under each pecking force is obtained to obtain the critical point of the simulated pecking number under each pecking force.

[0022] Based on the critical point of the simulated pecking count and the pecking force, the maximum pecking intensity that the cable can withstand is evaluated.

[0023] In some embodiments of the present invention, the influence of environmental factors on the actual insulation performance data is analyzed, including:

[0024] In the field cable hanging test, based on the field insulation performance data, the difference between the field insulation performance data corresponding to two data records is calculated to obtain the comprehensive damage degree;

[0025] Based on the bird pecking condition of the cable, the comprehensive damage degree of those with pecking factors during the two data recording periods is screened.

[0026] Based on the overall degree of damage caused by pecking, combined with the degree of bird pecking damage, the first degree of influence of environmental factors on the field insulation performance data is obtained.

[0027] In some embodiments of the present invention, the actual insulation performance data is corrected to remove environmental influence factors to obtain an environmentally corrected value, including:

[0028] In the field cable hanging test, based on the aforementioned field insulation performance data, the critical point of the corresponding number of field pecking times in the field cable hanging test is analyzed;

[0029] Based on the first degree of impact and the critical point of the number of actual pecking, the comprehensive degree of damage is corrected for environmental factors to obtain the environmental impact correction value.

[0030] In some embodiments of the present invention, analyzing the impact of environmental factors on the field insulation performance data further includes:

[0031] For any given comprehensive damage caused by pecking, take the preceding comprehensive damage degree not caused by pecking to obtain the environmental damage degree caused by environmental factors prior to the current pecking, and calculate the difference between the two, denoted as . ;

[0032] The difference between the overall injury degree before and after identifying the presence of pecking factors and the overall injury degree is in... The degree of environmental damage within the specified range is used to obtain a second degree of influence of environmental factors on the actual insulation performance data;

[0033] The process of correcting the actual insulation performance data to remove environmental influence factors to obtain a corrected value also includes: correcting the overall damage level to remove environmental influence factors based on the first degree of influence, the second degree of influence, and the critical point of the number of actual pecking incidents.

[0034] In some embodiments of the present invention, the methods for obtaining simulated insulation performance data and actual insulation performance data are as follows:

[0035] In the simulated bird-pecking test and the actual cable hanging test of the cable sample, a DC voltage is applied to the cable sample, the insulation resistance value of the cable sample is detected, the range of the insulation resistance value is normalized to represent the cable insulation performance, and simulated insulation performance data and actual insulation performance data are obtained.

[0036] As can be seen from the above embodiments, the method for testing the insulation performance of cable sheath materials coated with bird-pecking-proof material provided by the embodiments of the present invention has the following beneficial effects:

[0037] This invention analyzes the trend and magnitude of insulation performance changes over time based on simulated bird-pecking tests and the obtained simulated insulation performance data, assessing the maximum pecking intensity that the cable sample can withstand. In actual cable hanging tests, based on the obtained cable bird-pecking conditions and actual insulation performance data, combined with simulated insulation performance data, the invention analyzes the impact of environmental factors on the actual insulation performance data, corrects the actual insulation performance data for environmental influences, obtains the corrected values, and then assesses the cable sample's ability to repel birds. Finally, combining the maximum pecking intensity and repelling ability, the invention obtains the cable sample's bird-proof capability. This invention analyzes the changes in the insulation performance of the cable sheath material based on the detected changes, using data collected from actual cable hanging tests to examine the changes in cable insulation performance under conditions of bird pecking and non-pecking. It focuses on the changes in cable insulation performance caused by bird pecking behavior, and assesses the increase in the degree of damage to cable insulation performance with increasing bird pecking frequency, accurately determining the impact of bird pecking behavior on cable insulation performance, thus obtaining a more accurate and meaningful assessment of the cable sheath's bird-proof capability.

[0038] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0039] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the basic process for testing the insulation performance of cable sheath materials coated with bird-pecking material, as provided in an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram illustrating how the insulation performance of a cable changes with the cumulative number of bites, as provided in an embodiment of the present invention. Detailed Implementation

[0042] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a method for testing the insulation performance of cable sheath materials coated with bird-pecking material according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms such as “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or device comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the article or device that includes that element. Relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0044] The following will describe in detail, with reference to the accompanying drawings, a method for testing the insulation performance of a cable sheath material coated with bird-pecking material provided in this embodiment.

[0045] The scenario addressed by this invention is as follows: In field cable hanging tests, bird pecking behavior causes damage to the cable sheath material, affecting insulation performance. At the same time, due to the damage to the cable material, the internal conductors come into direct contact with the air, and in rainy or snowy weather, rainwater is more likely to seep into the conductors through the damaged area, which may further affect the cable insulation performance, the changes in insulation performance caused by bird pecking, and thus the assessment of the cable sheath's bird-proof capability.

[0046] Therefore, the main objective of this invention is to screen out the influence of environmental factors on cable insulation performance during on-site cable hanging tests, accurately detect data on changes in cable sheath insulation performance caused by bird pecking behavior, and evaluate the cable sheath's ability to resist bird pecking.

[0047] Please see Figure 1 This illustrates the basic process of a method for testing the insulation performance of a cable sheath material coated with bird-pecking material, provided by an embodiment of the present invention.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a method for testing the insulation performance of a cable sheath material coated with bird-pecking material, which specifically includes the following steps:

[0049] S100: Conduct simulated bird pecking tests and on-site cable hanging tests on cable samples, record the simulated insulation performance data after each pecking under different pecking forces in the simulated bird pecking test, and record the cable's bird pecking condition and on-site insulation performance data in the on-site cable hanging test.

[0050] Generally, the insulation performance of a cable sample is tested by measuring its insulation resistance under a DC voltage. A higher insulation resistance value indicates better insulation performance. Therefore, the method for obtaining simulated insulation performance data and actual insulation performance data in simulated bird-pecking tests and actual cable hanging tests is as follows: During these tests, a DC voltage is applied to the cable sample, the insulation resistance value is measured, and the range of the insulation resistance value is normalized and mapped to a normalized value. Within the range, and denoted as This is used to represent the cable insulation performance, obtaining simulated insulation performance data and actual insulation performance data. If the insulation performance value obtained from a certain cable sample test... The closer to The better the insulation performance of the cable sample, the better the insulation performance. Insulation performance parameters are then set. (This can be customized by the user; the settings in this example are as follows) ),like They concluded that the insulation performance of the cable sample was substandard.

[0051] To assess the bird-pecking resistance of cable materials, it is necessary to evaluate not only their ability to withstand the intensity of bird pecks (pecking resistance, simulated bird peck test), but also their ability to reduce bird peck behavior (repelling ability, field cable hanging test).

[0052] A simulated bird-pecking test was conducted on the cable samples. Specifically, cable samples coated with bird-pecking-resistant material were deployed in a laboratory setting. A bird-pecking simulation device was used to simulate the pecking force of different birds on the cable sheath, and the insulation performance of the cable samples was monitored in real time. After testing the cable insulation performance The value is less than or equal to the insulation performance parameter. Afterward, stop pecking and record the number of pecking attempts.

[0053] Record the simulated insulation performance data after each peck under different pecking forces in the simulated bird pecking test. Specifically, a total of [number] simulations were performed. The experiment was conducted under different pecking forces, and the results were recorded. The pecking force is The data set of insulation performance after each peck, obtained from the simulated bird pecking test, is as follows: ,in, Indicates the first The first type of pecking force Simulated insulation performance data after one bite Indicates the insulation performance of the cable The value is less than or equal to the insulation performance parameter. The total number of times the dog pecked.

[0054] Conduct on-site cable hanging tests on cable samples. Specifically, install the cable samples in actual environments where birds are active, and periodically (at a frequency consistent with the data collection frequency of simulated bird pecking tests) check whether there are any new damages to the cable sheath and the current insulation performance compared to the last test.

[0055] Record the cable's bird-pecking condition and insulation performance data during on-site cable hanging tests. Specifically, assume that a total of [number] data were recorded so far. This data is a collection of data on cable bird-pecking conditions obtained from on-site cable-hanging tests. ,in, Values or ; This indicates that no birds were recorded during the interval between the current and previous data entries. This indicates that bird pecking behavior at the cable sample was observed during the interval between the current and previous data recordings. It also records the sequence of changes in field insulation performance data obtained from field cable hanging tests. ,in, Indicates the first The field insulation performance data obtained during this data recording. This indicates the total number of data records during the field cable-hanging test.

[0056] Thus, by conducting simulated bird-pecking tests and on-site cable hanging tests on cable samples, we obtained simulated insulation performance data after each peck under different pecking forces in the simulated bird-pecking test, as well as data on the cable's bird-pecking condition and on-site insulation performance in the on-site cable hanging test.

[0057] The data obtained from simulated bird pecking tests only show the impact of bird pecking behavior on the cable sample's insulation performance. Furthermore, the pecking intervals are short, minimizing the impact of short-term contact between the cable's interior and air. Therefore, simulated bird pecking test data can effectively represent the influence of bird pecking behavior at different intensities on the cable sample's insulation performance and its resistance to pecking. However, in actual field testing, due to the coating of the samples with a material that produces an odor repulsive to birds, bird pecking is random and infrequent, with longer intervals. In addition to bird pecking behavior causing changes in insulation performance, environmental factors (such as oxidation from air contact and rainwater penetration) also significantly affect the insulation performance, greatly increasing its susceptibility to external influences. Therefore, by comparing data from actual cable hanging tests with data from simulated bird pecking tests, data consistent with changes in insulation performance caused by bird pecking behavior can be selected. These data can then be corrected for external influences to assess the cable sample's repellency. Specifically, this includes steps S200 to S400.

[0058] S200: In simulated bird pecking tests, based on simulated insulation performance data, the critical point of the number of simulated pecking times under each pecking force is analyzed, and the maximum pecking intensity that the cable can withstand is evaluated in combination with the pecking force.

[0059] In simulated bird pecking tests, not every pecking action of the same force has the same impact on the insulation performance of the cable sample. Rather, the cumulative damage to the sheath caused by continuous pecking eventually exceeds the maximum strength (critical point) that the sheath can withstand after a single peck, thus compromising its protective properties. Subsequent pecking actions will then have a greater impact on the insulation performance (e.g., ...). Figure 2 (As shown). Therefore, the critical point of pecking that damages the sheath protection can be determined based on the change in insulation performance under cumulative pecking.

[0060] Based on the above analysis, in the embodiments of the present invention, in the simulated bird pecking test, based on simulated insulation performance data, the critical point of the number of simulated pecking times under each pecking force is analyzed, and combined with the pecking force, the maximum pecking intensity that the cable can withstand is evaluated. Further aspects include:

[0061] First, in the simulated bird-pecking test, based on simulated insulation performance data, the degree of bird-pecking damage to the cable insulation performance caused by each peck is analyzed, as well as the degree of damage improvement caused by each peck compared to the previous peck, and the total degree of bird-pecking damage to the cable insulation performance after each peck, thus obtaining the simulated critical point characteristic degree of each peck for each pecking force. Among these:

[0062] In simulated bird-pecking tests, based on simulated insulation performance data, the degree of bird-pecking damage to the cable insulation performance caused by each peck is analyzed. Specifically, this includes: in simulated bird-pecking tests, based on the simulated insulation performance data after each peck at different pecking forces, calculating the difference between the simulated insulation performance data after each peck and the data after the previous peck, obtaining the degree of bird-pecking damage to the cable insulation performance caused by each peck at all pecking forces, and obtaining the maximum degree of bird-pecking damage to the cable insulation performance caused by all pecks at different pecking forces. (The text then continues with a discussion of bird-pecking damage, mentioning a specific test and a maximum damage rate.) Data set of insulation performance under various biting forces For example, let's obtain the difference sequence of this set as . ( Indicates the first The first type of pecking force The degree of bird-peck damage to cable insulation caused by the second bite is used to indicate the degree of damage caused by the bird-peck. The degree of bird beak damage to the cable insulation performance caused by each bite under various pecking forces was determined. The maximum degree of bird beak damage to the cable insulation performance caused by all bites under all pecking forces was also obtained, i.e., the difference sequence. The maximum value in is .

[0063] Each bird peck can potentially damage the cable insulation. As the damage accumulates, more cable is exposed, increasing the likelihood and severity of subsequent pecks. Therefore, in simulated bird peck tests, based on simulated insulation performance data, the degree of damage increase caused by each peck compared to the previous peck is analyzed. Specifically, in simulated bird peck tests, based on the degree of bird peck damage caused by each peck at different pecking intensities, the difference between the degree of bird peck damage after each peck and the corresponding degree of bird peck damage after the previous peck is calculated, thus obtaining the degree of damage increase caused by each peck at different pecking intensities compared to the previous peck. This difference sequence is denoted as... For example, calculate the first... The first type of pecking force The second peck is related to the previous peck (the first) The difference in the degree of pecking damage caused by each pecking attack is denoted as: , Indicates the first The first type of pecking force The damage caused by a subsequent bite is greater than that caused by the previous bite.

[0064] As the number of pecking attacks increases, the cumulative damage to the cable also increases. Therefore, in simulated bird pecking tests, based on simulated insulation performance data, the total bird pecking damage to the cable insulation after each pecking attack is analyzed. Specifically, this includes: in simulated bird pecking tests, based on the bird pecking damage caused to the cable insulation by each pecking attack under different pecking forces, calculating the cumulative damage value of the bird pecking damage after each pecking attack and all preceding pecking attacks, thus obtaining the total bird pecking damage to the cable insulation after each pecking attack under different pecking forces. This is denoted as a difference sequence. For example, calculate the first... The first type of pecking force The cumulative damage to the cable insulation performance caused by each bite is [value missing]. , Indicates the first The first type of pecking force The total damage to the cable insulation caused by the bird peck after the second bite, compared to the initial state. Indicates the first The first type of pecking force The extent of bird-induced damage to cable insulation caused by a single pecking attack.

[0065] Furthermore, based on the degree of beak damage, the maximum degree of beak damage, the degree of damage amplification, and the total degree of beak damage, the simulated critical point characteristic of each beak bite under each beak force is obtained as follows:

[0066]

[0067] In the formula, Indicates the first The first type of pecking force The characteristic degree of the simulated critical point of the second bite; Indicates the first The first type of pecking force The degree of damage caused by each subsequent peck is greater than that caused by the previous peck; Indicates the first The first type of pecking force The total bird-peck damage to the cable insulation performance after the second bite compared to the initial state; Indicates the first The first type of pecking force The extent of bird-induced damage to cable insulation performance caused by secondary pecking; This represents the maximum degree of bird-beak damage to the cable insulation performance caused by all bird-beaking events at all pecking forces, i.e., the difference sequence. The maximum value in.

[0068] The larger the value, the greater the degree of damage to the cable insulation performance caused by this pecking compared to the previous pecking behavior, and the higher the critical point characteristic of this pecking. The larger the value, the higher the total bird peck damage compared to the initial state after this peck, and the higher the critical point characteristic of this peck; The range is The value within represents the ratio of the impact of this bite on insulation performance to the highest impact value in this experiment. A larger value indicates a higher impact relative to the overall test, and a higher characteristic of the bite critical point. In summary, The larger the value, the more likely the cumulative damage after this pecking action is to just exceed the maximum pecking intensity that the cable can withstand.

[0069] Then, based on the simulated critical point characteristic degree and the biting force, the maximum biting intensity that the cable can withstand is evaluated. Specifically, this includes obtaining the maximum value of the simulated critical point characteristic degree for all bites at each biting force, thus obtaining the critical point for the number of simulated bites at each biting force. Taking the pecking force as an example, calculate the simulated critical point characteristic degree for all pecking ... Take the maximum value among them, and denote the second index of the maximum value as . , obtained the The critical point for the number of simulated pecking strokes under a certain pecking force is: .

[0070] Based on the critical point of simulated bite count and the bite force, the maximum bite intensity that the cable sample can withstand is evaluated as follows:

[0071]

[0072] In the formula, This indicates the maximum biting strength that the cable sample can withstand. Indicates the first The magnitude of the pecking force; Indicates the first The critical point for the number of simulated pecking strokes under a certain pecking force; Indicates the first The number of pecks that reach the critical point of simulated peck count under a certain pecking force.

[0073] S300: In the field cable hanging test, based on the cable's bird pecking condition and the actual insulation performance data, combined with the simulated insulation performance data, the influence of environmental factors on the actual insulation performance data is analyzed, and the actual insulation performance data is corrected to remove environmental influence factors to obtain the environmental influence correction value, thereby evaluating the cable sample's ability to repel birds.

[0074] In field cable hanging tests, the sheath damage threshold must be reached for a significant impact on cable insulation performance. However, bird pecking behavior in field cable hanging tests is random and does not concentrate at the same point. Therefore, it is difficult for bird pecking alone to cause cumulative damage to the sheath at a specific point to reach the critical point. Furthermore, after bird pecking causes some damage to the cable, the damaged area is exposed to the air for an extended period and comes into direct contact with rainwater, resulting in cumulative damage not caused by bird pecking. The cumulative damage caused by this environmental factor is more pronounced than that caused by bird pecking.

[0075] Based on the above analysis, in the embodiments of the present invention, during the field cable hanging test, based on the cable's bird-pecking condition and field insulation performance data, combined with simulated insulation performance data, the influence of environmental factors on the field insulation performance data is analyzed. The field insulation performance data is then corrected to remove environmental influence factors, resulting in a corrected value, which is used to evaluate the cable sample's ability to repel birds. Wherein:

[0076] In the field cable hanging test, based on the cable's bird-pecking condition and actual insulation performance data, combined with simulated insulation performance data, the impact of environmental factors on the actual insulation performance data was analyzed, specifically including:

[0077] First, during the on-site cable-hanging test, the difference between the on-site insulation performance data from two different data recordings is calculated based on the on-site insulation performance data to obtain the overall degree of damage. This is based on the insulation performance change sequence obtained from the on-site cable-hanging test. The difference sequence of this sequence is obtained as follows , Indicates the first The next data record and the first The change in actual insulation performance data during the data recording interval represents the value of the change in the data of the first data recording interval. The next data record and the first The overall degree of damage during the data recording interval.

[0078] Then, based on the data obtained from the on-site cable hanging test, the cable was subjected to bird pecking. It can be seen that when The time interval indicates that bird pecking occurred between the current and previous data recordings. Therefore, based on the bird pecking condition of the cable, the comprehensive damage caused by pecking factors between the two data recordings is selected, i.e., a selection is made. The overall degree of damage at that time;

[0079] Finally, based on the overall damage caused by pecking, combined with the degree of bird pecking damage, the primary influence of environmental factors on the field insulation performance data is determined. Specifically, since the field cable-hanging test, compared to the simulated bird pecking test, includes the influence of outdoor environmental factors, even if bird pecking behavior occurs during the data recording interval, environmental factors are still present. Therefore, the environmental impact component data in the field insulation performance data can be obtained by comparing the insulation performance data from the field cable-hanging test and the simulated bird pecking test. A difference sequence is recorded. middle The number of comprehensive damage severity data (comprehensive damage severity data with bird beak influencing factors) is For the difference sequence Inner A comprehensive damage severity data (and ), which is recorded as the first The comprehensive damage severity data, considering factors including bird pecking, was used to determine the primary influence of environmental factors on the field insulation performance data. , The calculation formula is:

[0080]

[0081] In the formula, Represents the difference sequence Inner A comprehensive damage severity data (and , No. The degree of influence of environmental factors on field insulation performance data in the comprehensive damage data (including data on the degree of damage caused by bird pecking); Indicates the first The next data record and the first The change in actual insulation performance data during the data recording interval represents the value of the change in the data of the first data recording interval. The next data record and the first The overall extent of damage during the data recording interval; Indicates the first The first type of pecking force The extent of bird-induced damage to cable insulation performance caused by secondary pecking; This indicates the amount of force applied during a bite.

[0082] The force of the bite The average degree of damage caused by a bird's peck. This indicates the removal of the comprehensive damage level data. Environmental impact data obtained after bird pecking factor.

[0083] The field insulation performance data is corrected for environmental impact factors to obtain the environmental impact correction value, which specifically includes:

[0084] First, in the field cable hanging test, based on the field insulation performance data, the corresponding critical point of the number of bites in the field cable hanging test is analyzed. A more specific implementation method is the same as the method for obtaining the critical point of the simulated number of bites, that is, the maximum field critical point characteristic value in the field cable hanging test is calculated and denoted as... The critical point for the number of bites in the actual cable hanging test was obtained as follows: ,by Difference sequence The cases are divided into two segments: before and after the cumulative damage of the cable sample exceeds the critical point.

[0085] Then, based on the critical point of the first degree of impact and the number of actual bites, the overall damage degree is corrected for environmental factors, resulting in the environmental impact correction value:

[0086]

[0087] In the formula, Indicates the first The environmental impact-free correction value for the overall damage level obtained from the next data record; Indicates the first The next data record and the first The overall extent of damage during the data recording interval; Represents the difference sequence Inner A comprehensive damage severity data (and , No. The degree of influence of environmental factors on field insulation performance data in the comprehensive damage data (including data on the degree of damage caused by bird pecking); Indicates the first This data record; This indicates the critical point for the number of bites in the actual field during the cable hanging test.

[0088] For the first This data record (and , No. (Comprehensive damage data on the impact of bird beaks) Data on the comprehensive damage caused by bird beaks to cable insulation performance, including data on changes in insulation performance caused by bird beaks and environmental factors. The environmental impact data in this study is calculated by comprehensively comparing the data obtained from the on-site cable hanging test and the simulated bird pecking test. and These represent the current number of data points and the number of data points recorded when the cable damage reaches its maximum value, respectively. The ratio of these two values ​​represents the number of data points recorded at the current time. This data represents the degree of influence of environmental factors on the data obtained from bird pecks. The larger the value, the greater the influence on the data obtained from bird pecks. This value is used as... The reference value is used to obtain the corrected value after removing the influence of environmental factors. .

[0089] In the field cable-hanging test, the impact of environmental factors on the field insulation performance data was analyzed, specifically including:

[0090] Because the intervals between bird pecking incidents during on-site cable testing were long, and other bird-pecked damage points existed in other areas prior to the current pecking incident, the environmental factors also affected the insulation performance at the time of the bird pecking incident. Therefore, the environmental factors before and after the pecking incident also had a similar impact on the insulation performance. Thus, the environmental impact of the bird pecking incident can be assessed and removed based on the changes in insulation performance before and after the pecking incident data. Therefore, in some embodiments of this invention, firstly, for any comprehensive damage caused by pecking, a prior comprehensive damage degree not caused by pecking is taken to obtain the environmental damage degree caused by environmental factors before the current pecking incident, and the difference between the two is calculated and denoted as... Data on the overall degree of damage obtained from pecking by any bird. For example, let's take a data point representing the change in insulation performance not caused by a bird peck as . This represents the change in insulation performance caused by environmental factors prior to the bird pecking incident. The difference between the two values ​​is calculated. ), denoted as Then, the difference between the overall injury degree before and after identifying the presence of pecking factors and the overall injury degree was calculated. The degree of environmental damage within a certain range is used to determine the second degree of influence of environmental factors on the field insulation performance data, i.e., to identify the presence of pecking factors. consecutive and The difference is in The data within the range are used as data on the changes in insulation performance caused by environmental factors at the time of the bird's peck, and the mean value of the obtained data is recorded as follows. The degree of influence of environmental factors on the field insulation performance data was obtained as follows: .

[0091] Furthermore, the environmental impact factors are corrected for the actual insulation performance data to obtain the environmental impact correction value. This also includes: correcting the overall damage degree for environmental impact factors based on the first degree of impact, the second degree of impact, and the critical point of the number of actual bites, to obtain the environmental impact correction value.

[0092]

[0093] In the formula, Indicates the first The environmental impact-free correction value for the overall damage level obtained from the next data record; Indicates the first The next data record and the first The overall extent of damage during the data recording interval; This indicates that only the degree of influence of environmental factors on the field insulation performance data is considered in the field test; Represents the difference sequence Inner A comprehensive damage severity data (and , No. The degree of influence of environmental factors on field insulation performance data in the comprehensive damage data (including data on the degree of damage caused by bird pecking); Indicates the first This data record; This indicates the critical point for the number of bites in the actual field during the cable hanging test.

[0094] The environmental impact data in this study is derived from a comprehensive comparison and calculation based on the field cable-hanging test and the simulated bird-pecking test. This refers to the average change in insulation performance within a certain range before and after the bird pecking incident, considering only the data not caused by bird pecking during the field test. It represents the second degree of influence of environmental factors other than bird pecking on the field insulation performance data. The combined mean of the two values ​​represents the degree of influence of environmental factors on the field insulation performance data.

[0095] Finally, based on the environmental impact correction values, the bird-repelling ability of the cable samples was assessed. Specifically, the difference sequence... middle The number of comprehensive damage severity data (comprehensive damage severity data with bird beak influencing factors) is The environmentally corrected value of the comprehensive damage level data for each bird-pecking influencing factor calculated using the above method is... Based on this, the cable sample's ability to repel birds is calculated as follows:

[0096]

[0097] In the formula, This indicates the cable sample's ability to repel birds; Represents the difference sequence The Middle indivual Comprehensive damage severity data (the first) Environmentally corrected value (based on the comprehensive damage level data of factors influencing bird pecking). Represents the difference sequence middle The number of comprehensive damage severity data (comprehensive damage severity data with bird peck influencing factors).

[0098] The fewer the overall damage data involving bird pecking factors, and the smaller the environmental impact correction value for each bird pecking (the lower the impact of each bird pecking), the stronger the cable sample's ability to repel birds.

[0099] S400: The bird-proof capability of the cable sample is obtained by combining maximum biting strength and repelling ability.

[0100] Combining maximum biting strength and repelling ability, the bird-proof capability of the cable sample is as follows:

[0101]

[0102] In the formula, Indicates the bird-proof capability of the cable sample; This indicates the maximum biting strength that the cable sample can withstand. This indicates the cable sample's ability to repel birds; This represents the linear normalization function.

[0103] The greater the maximum biting force that a cable sample can withstand, and the stronger its ability to repel birds, the stronger its bird-proof capability. Based on this, the bird-proof capability of the cable sample is quantitatively evaluated.

[0104] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0105] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A method for testing the insulation performance of cable sheath materials coated with bird-pecking-proof material, characterized in that, The method includes: Simulated bird pecking tests and on-site cable hanging tests were conducted on cable samples. Simulated insulation performance data after each pecking under different pecking forces in the simulated bird pecking test were recorded, as well as the cable pecking condition and on-site insulation performance data in the on-site cable hanging test were recorded. In the simulated bird pecking test, based on the simulated insulation performance data, the critical point of the number of simulated pecking times under each pecking force is analyzed, and combined with the pecking force, the maximum pecking intensity that the cable sample can withstand is evaluated. In the field cable hanging test, based on the bird pecking condition of the cable and the field insulation performance data, combined with the simulated insulation performance data, the influence of environmental factors on the field insulation performance data is analyzed, and the field insulation performance data is corrected to remove environmental influence factors to obtain the environmental influence correction value, thereby evaluating the cable sample's ability to repel birds. The bird-proof capability of the cable sample is obtained by combining the maximum pecking strength and the repelling ability. In the simulated bird pecking test, based on the simulated insulation performance data, the critical point of the number of simulated pecking attempts under each pecking force is analyzed. Combined with the pecking force, the maximum pecking intensity that the cable can withstand is evaluated, including: In the simulated bird pecking test, based on the simulated insulation performance data, the degree of bird pecking damage to the cable insulation performance caused by each pecking is analyzed, as well as the degree of damage improvement caused by each pecking compared to the previous pecking, and the total degree of bird pecking damage to the cable insulation performance after each pecking is analyzed, so as to obtain the simulated critical point characteristic degree of each pecking under each pecking force. Based on the simulated critical point characteristic and the biting force, the maximum biting intensity that the cable can withstand is evaluated.

2. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 1, characterized in that, In the simulated bird-pecking test, based on the simulated insulation performance data, the degree of damage to the cable insulation performance caused by each peck is analyzed, including: In the simulated bird pecking test, based on the simulated insulation performance data after each pecking under different pecking forces, the difference between the simulated insulation performance data after each pecking and the previous pecking is calculated to obtain the degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces, and the maximum degree of bird pecking damage to the cable insulation performance caused by all pecking under all pecking forces is obtained.

3. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 2, characterized in that, In simulated bird pecking tests, based on the simulated insulation performance data, the degree of damage improvement caused by each peck compared to the previous peck is analyzed, including: In the simulated bird pecking test, based on the degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces, the difference between the degree of bird pecking damage after each pecking and the corresponding degree of bird pecking damage after the previous pecking is calculated, so as to obtain the degree of damage improvement caused by each pecking under different pecking forces compared to the previous pecking.

4. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 2, characterized in that, In the simulated bird-pecking test, based on the simulated insulation performance data, the total degree of bird-pecking damage to the cable insulation performance after each peck is analyzed, including: In the simulated bird pecking test, based on the degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces, the cumulative damage value of the bird pecking damage degree corresponding to each pecking and all previous pecking is calculated, so as to obtain the total degree of bird pecking damage to the cable insulation performance caused by each pecking under different pecking forces.

5. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 1, characterized in that, Based on the simulated critical point characteristic and the biting force, the maximum biting strength that the cable can withstand is evaluated, including: The maximum value of the simulated critical point characteristic of all pecking under each pecking force is obtained to obtain the critical point of the simulated pecking number under each pecking force. Based on the critical point of the simulated pecking count and the pecking force, the maximum pecking intensity that the cable can withstand is evaluated.

6. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 2, characterized in that, The impact of environmental factors on the field insulation performance data was analyzed, including: In the field cable hanging test, based on the field insulation performance data, the difference between the field insulation performance data corresponding to two data records is calculated to obtain the comprehensive damage degree; Based on the bird pecking condition of the cable, the comprehensive damage degree of those with pecking factors during the two data recording periods is screened. Based on the overall degree of damage caused by pecking, combined with the degree of bird pecking damage, the first degree of influence of environmental factors on the field insulation performance data is obtained.

7. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 6, characterized in that, The actual insulation performance data is corrected for environmental impact factors to obtain the environmental impact correction value, including: In the field cable hanging test, based on the aforementioned field insulation performance data, the critical point of the corresponding number of field pecking times in the field cable hanging test is analyzed; Based on the first degree of impact and the critical point of the number of actual pecking, the comprehensive degree of damage is corrected for environmental factors to obtain the environmental impact correction value.

8. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 7, characterized in that, The analysis of the impact of environmental factors on the field insulation performance data also includes: For any given comprehensive damage caused by pecking, take the preceding comprehensive damage degree not caused by pecking to obtain the environmental damage degree caused by environmental factors prior to the current pecking, and calculate the difference between the two, denoted as . ; The difference between the overall injury degree before and after identifying the presence of pecking factors and the overall injury degree is in... The degree of environmental damage within the specified range is used to obtain a second degree of influence of environmental factors on the actual insulation performance data; The process of correcting the actual insulation performance data to remove environmental influence factors to obtain a corrected value also includes: correcting the overall damage level to remove environmental influence factors based on the first degree of influence, the second degree of influence, and the critical point of the number of actual pecking incidents.

9. The method for testing the insulation performance of cable sheath material coated with bird-pecking material according to claim 1, characterized in that, The methods for obtaining simulated insulation performance data and actual insulation performance data are as follows: In the simulated bird-pecking test and the actual cable hanging test of the cable sample, a DC voltage is applied to the cable sample, the insulation resistance value of the cable sample is detected, the range of the insulation resistance value is normalized to represent the cable insulation performance, and simulated insulation performance data and actual insulation performance data are obtained.

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