A wall bushing insulation performance testing device and method

Abstract

The present invention relates to the technical field of insulation performance testing, and specifically to an insulation performance detection device and method for a wall bushing. The present invention first obtains a humidity change index of the dehumidification process according to the difference in humidity values ​​before and after dehumidification during the dehumidification process; obtains an insulation improvement index of the dehumidification process according to the difference in resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from a preset resistance standard value; obtains the humidity influence of the wall bushing according to the humidity change index and insulation improvement index of all dehumidification processes; obtains the product damage influence of the wall bushing according to the numerical distribution of all resistance values ​​during the test; and detects the insulation damage performance of the wall bushing according to the product damage influence and humidity influence. The present invention more accurately analyzes the insulation performance anomalies caused by product damage to the wall bushing by deeply analyzing the effects of product damage and humidity on product insulation.

Description

Technical Field

[0001] The invention relates to the technical field of insulation performance testing, and in particular to an insulation performance testing device and method for a wall bushing. Background Art

[0002] Wall bushing, also known as wall bushing, waterproof bushing or wall embedded pipe, is a hardware accessory used for pipes or wires and cables to pass through the walls of buildings with vibration or waterproofing requirements. Wall bushings with good insulation performance can isolate wires from the surrounding environment, prevent current leakage and short circuit, and thus protect the safety of equipment. As an important component in electrical equipment, the insulation performance of wall bushings is directly related to the safety and reliability of the entire system. With the long-term operation of wall bushings, the materials of wall bushings are prone to damage such as aging, cracking or deformation, resulting in reduced insulation performance. Analyzing the abnormal insulation performance caused by damage to wall bushings is an important link in ensuring the safe and stable operation of electrical equipment.

[0003] Since the resistance value of the wall bushing is higher when the product quality is good, and the resistance value of the wall bushing is lower when the product is damaged, the existing technology determines that the product damage of the wall bushing causes abnormal insulation performance by analyzing the resistance value of the wall bushing. However, when the existing technology analyzes the product damage of the wall bushing, there is a problem that when the wall bushing is in an environment with high humidity, the humidity will enhance the conductivity of the wall bushing and cause the resistance value of the wall bushing to decrease, resulting in inaccurate detection of abnormal insulation performance caused by product damage of the wall bushing. Summary of the invention

[0004] In order to solve the technical problem that it is difficult to accurately detect the abnormal insulation performance caused by the damage of wall bushing products in the prior art, the purpose of the present invention is to provide an insulation performance detection device and method for wall bushings. The technical scheme adopted is as follows:

[0005] The present invention proposes an insulation performance detection device for a wall bushing, the detection device comprises a humidity detector for collecting humidity values ​​of the wall bushing, a resistance detection module for collecting resistance values ​​of the wall bushing, a hot air blower for dehumidifying the wall bushing, and a detector for detecting insulation damage performance. The detector is connected to the humidity detector, the resistance detection module and the hot air blower to obtain the humidity value and resistance value of the wall bushing during the dehumidification process and the test process, and detects the insulation damage performance according to the humidity value and resistance value during the dehumidification process and the test process. The insulation damage performance detection process comprises:

[0006] According to the difference between the humidity value and the preset humidity standard value, a dehumidification operation is performed to obtain all dehumidification processes of the wall bushing; according to the difference between the humidity values ​​before and after dehumidification in the dehumidification process, a humidity change index of the dehumidification process is obtained; according to the difference between the resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value, an insulation improvement index of the dehumidification process is obtained; according to the humidity change index and the insulation improvement index of all the dehumidification processes, the humidity influence of the wall bushing is obtained;

[0007] According to the numerical distribution of all resistance values ​​during the test, the product damage impact of the wall bushing is obtained; according to the product damage impact and the humidity impact, the insulation damage performance of the wall bushing is detected.

[0008] Furthermore, the method for obtaining the dehumidification process includes:

[0009] The wall bushing with a resistance value less than the preset resistance standard value is taken as the initial wall bushing to be analyzed; the wall bushing to be analyzed is dehumidified according to the preset dehumidification criterion to obtain each updated wall bushing to be analyzed during the dehumidification process; the dehumidification operation is repeated until the wall bushing to be analyzed meets the preset iteration termination condition and the dehumidification is stopped, and all dehumidification processes of the wall bushing are obtained;

[0010] The preset dehumidification criteria include: if the humidity value before dehumidification is greater than the preset humidity standard value, according to the difference between the humidity value before dehumidification and the preset humidity standard value, the dehumidification time of the dehumidification process is obtained, and the working time of the hot air blower is set according to the dehumidification time to perform dehumidification operation on the wall sleeve; the preset iteration termination condition includes: the humidity value before dehumidification is not greater than the preset humidity standard value.

[0011] Furthermore, the method for obtaining the dehumidification time includes:

[0012] The difference between the humidity value before dehumidification and the preset humidity standard value is calculated and normalized to obtain the humidity measurement; the product of the preset adjustment time and the humidity measurement is calculated to obtain the adjustment time; the sum of the adjustment time and the preset reference time is calculated to obtain the dehumidification time.

[0013] Furthermore, the method for obtaining the humidity change index includes:

[0014] The absolute value of the difference between the humidity values ​​before and after dehumidification is calculated to obtain the humidity change index of the dehumidification process.

[0015] Furthermore, the method for obtaining the insulation improvement index includes:

[0016] The absolute value of the difference between the resistance value after dehumidification and the resistance value before dehumidification is calculated to obtain the insulation resistance difference; the ratio of the resistance value after dehumidification to the preset resistance standard value is calculated to obtain the resistance normality after dehumidification; the product of the insulation resistance difference and the resistance normality after dehumidification is calculated to obtain the insulation improvement index.

[0017] Furthermore, the method for obtaining the humidity influence degree includes:

[0018] According to the humidity change index and the insulation improvement index of the dehumidification process, a local humidity impact index of the dehumidification process is obtained; the insulation improvement index and the local humidity impact index are positively correlated; the humidity change index and the local humidity impact index are negatively correlated;

[0019] The local humidity impact indicators of all dehumidification processes are integrated to obtain the humidity impact degree.

[0020] Furthermore, the method for obtaining the product damage impact includes:

[0021] According to the overall distribution of all resistance values ​​during the test, the overall resistance value of the test is obtained;

[0022] According to the difference between the preset resistance standard value and the tested overall resistance value, the damage parameter is obtained;

[0023] According to the fluctuation of all resistance values ​​during the test, the test resistance fluctuation parameter is obtained;

[0024] The product damage impact of the wall bushing is obtained according to the damage parameter and the test resistance fluctuation parameter.

[0025] Furthermore, the method for obtaining the damage parameters includes:

[0026] The preset resistance standard value minus the overall resistance value of the test is calculated to obtain a difference. When the difference is greater than 0, the difference is used as the damage parameter of the overall resistance value of the test; when the difference is not greater than 0, the damage parameter is set to 0.

[0027] Furthermore, the method for obtaining the insulation damage performance includes:

[0028] The absolute value of the difference between the resistance value before dehumidification in the first dehumidification process and the preset resistance standard value is calculated to obtain the insulation abnormality degree;

[0029] The sum of the humidity influence and the preset denominator adjustment is calculated to obtain the first parameter; the ratio of the insulation abnormality to the first parameter is calculated to obtain the second parameter; the product of the second parameter and the product damage influence is calculated to obtain the third parameter; the third parameter is normalized to obtain the insulation damage performance of the wall bushing.

[0030] The present invention provides a method for detecting the insulation performance of a wall bushing. The method uses any one of the above-mentioned devices for detecting the insulation performance of a wall bushing for detection.

[0031] The present invention has the following beneficial effects:

[0032] In order to analyze the degree of insulation performance degradation caused by humidity factors, the humidity change index is used to reflect the effect of the dehumidification process. The larger the humidity change index, the more obvious the humidity reduction. Resistance value is an important parameter for measuring insulation performance. A high resistance value usually indicates better insulation performance. The insulation improvement index of the dehumidification process is obtained according to the difference between the resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value. The larger the insulation improvement index, the larger the resistance value after dehumidification and the closer it is to the preset resistance standard value, indicating that the dehumidification process improves the insulation performance more obviously. The humidity influence degree reflects the influence of humidity on the insulation performance of the wall bushing. The larger the humidity influence degree value, the more obvious the influence of humidity on the insulation performance of the wall bushing. Considering that product damage may change the internal structure of the wall bushing, thus causing instability in the values ​​of all resistance values ​​during the test, and that product damage to the wall bushing often leads to a decrease in resistance, the product damage impact of the wall bushing is obtained; the smaller the product damage impact, the healthier the internal structure of the wall bushing is and the less likely it is to cause product loss; the product damage impact preliminarily reflects the degree of insulation performance degradation caused by internal factors of the equipment; and the humidity impact reflects the degree of insulation performance degradation caused by humidity factors. The insulation damage performance of the wall bushing is obtained by combining the product damage impact and humidity impact; the insulation damage performance more accurately reflects the degree of insulation performance abnormality caused by product damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of a method for detecting insulation performance of a wall bushing provided by an embodiment of the present invention;

[0035] Figure 2 A schematic structural diagram of an insulation performance testing device for a wall bushing provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a detector provided by one embodiment of the present invention;

[0037] Figure 4 A flow chart of a method for obtaining the impact of product damage provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the insulation performance detection device and method of a wall bushing proposed by the present invention, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0039] Unless defined otherwise, 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 belongs.

[0040] The specific scheme of the insulation performance detection device and method of the wall bushing provided by the present invention is described in detail below with reference to the accompanying drawings.

[0041] In order to accurately detect the degree of abnormal insulation performance caused by damage to the wall bushing product, the present invention focuses on the detection method of insulation damage performance of the wall bushing. Figure 1 , which shows a flow chart of a method for detecting insulation performance of a wall bushing provided by an embodiment of the present invention, and the flow chart shows a specific method for detecting insulation damage performance of a wall bushing.

[0042] The present invention is a specific method for realizing insulation damage performance detection of a wall bushing by using insulation performance detection equipment of the wall bushing. Figure 2 FIG. 1 is a schematic diagram showing the structure of an insulation performance detection device for a wall bushing provided by an embodiment of the present invention. Figure 2 As shown, the insulation performance testing device 0 includes a detector 01, a resistance detection module 02, a humidity detector 03, a hot air blower 04, and a mobile power supply 05 connected in communication. In the embodiment of the present invention, wireless communication is used. Figure 2 , a process of detecting insulation damage performance of a wall bushing insulation performance detection device provided by an embodiment of the present invention is introduced as follows:

[0043] The detector 01 inside the insulation performance testing device 0 is connected to a humidity detector 03, a resistance detection module 02, a movable power supply 05 and a hot air blower 04. The humidity detector 03 is used to detect the humidity of the wall bushing; the resistance detection module 02 is used to detect the resistance of the wall bushing; the hot air blower 04 is used to perform different degrees of dehumidification operations on the wall bushing to improve the humidity performance of the wall bushing; the detector 01 is used to process and execute instructions to detect insulation damage performance; the movable power supply 05 is used to power the hot air blower 04; by using the insulation performance testing device to perform a testing process on the wall bushing, the insulation performance testing device 0 After the internal humidity detector 03 and the resistance detection module 02 detect the resistance value and humidity value of the wall bushing, the detector 01 will execute the dehumidification operation instruction according to the resistance value and humidity value of the wall bushing, thereby controlling the hot air blower 04 to perform a dehumidification operation on the wall bushing and obtain a dehumidification data set for each dehumidification process. After the execution of the dehumidification operation instruction, the test operation control instruction will be executed, that is, the resistance of the wall bushing is tested multiple times and a test data set of the test process is obtained. The detector 01 detects the insulation damage performance of the wall bushing based on the dehumidification data set of each dehumidification process of the wall bushing and the test data set of the test process.

[0044] Since the insulation performance detection device for wall bushing provided by the embodiment of the present invention focuses on the detector 01, the detector 01 at least includes a memory and a processor, please refer to Figure 3 , which shows a schematic diagram of the structure of a detector provided in one embodiment of the present invention, including a processor 200, a memory 201, a bus 202 and a communication interface 203, wherein the processor 200, the communication interface 203 and the memory 201 are connected via the bus 202; wherein the memory 201 may include a high-speed random access memory, the bus 202 may be an ISA bus, a PCI bus or an EISA bus, etc., and the processor 200 may be an integrated circuit chip with signal processing capabilities; the memory 201 stores at least one instruction, at least one program, a code set or an instruction set, and when the at least one instruction, at least one program, a code set or an instruction set is loaded and executed by the processor, the steps in a method for detecting the insulation performance of a wall bushing are implemented. Figure 1 , which shows a flow chart of a method for detecting insulation performance of a wall bushing provided by an embodiment of the present invention, the method comprising the following steps:

[0045] Step S1: Obtain a dehumidification data set of each dehumidification process of the wall bushing and a test data set of the test process; the dehumidification data set includes humidity values ​​and resistance values ​​before and after dehumidification, and the test data set includes various resistance values.

[0046] Considering that the abnormal insulation performance of wall bushing products is mainly affected by the damage of the product itself and humidity, it is necessary to analyze the influence of humidity on the abnormal insulation performance of wall bushing products and the influence of product damage on the abnormal insulation performance of wall bushing products. First, it is necessary to obtain the dehumidification data set of each dehumidification process of the wall bushing and the test data set of the test process to provide data support for the subsequent analysis of the abnormal insulation performance caused by the damage of the wall bushing products.

[0047] In order to subsequently analyze the abnormal influence of humidity on the insulation performance of the wall bushing product, it is first necessary to collect data on the dehumidification process of the wall bushing product. Preferably, in one embodiment of the present invention, the method for acquiring the dehumidification process includes:

[0048] (1) The humidity value and resistance value of the wall bushing can be detected by the humidity detector 03 and the resistance detection module 02. At the beginning of the dehumidification operation, the wall bushing with a resistance value less than the preset resistance standard value is used as the initial wall bushing to be analyzed; (2) The wall bushing to be analyzed is dehumidified according to the preset dehumidification criteria to obtain each updated wall bushing to be analyzed during the dehumidification process; (3) The dehumidification operation (2) is repeated until the wall bushing to be analyzed meets the preset iteration termination condition to terminate the dehumidification operation, and the humidity values ​​before and after dehumidification of each dehumidification process, as well as the resistance values ​​before and after dehumidification of all dehumidification processes, are counted to obtain the dehumidification data set of each dehumidification process. The preset dehumidification criteria include: if the humidity value before dehumidification is greater than the preset humidity standard value, according to the difference between the humidity value before dehumidification and the preset humidity standard value, the dehumidification time of the dehumidification process is obtained, and the working time of the hot air blower 04 is set according to the dehumidification time to perform a dehumidification operation on the wall bushing; the preset iteration termination condition includes: the humidity value before dehumidification is not greater than the preset humidity standard value. In one embodiment of the present invention, the method for obtaining the preset humidity standard value and the preset resistance standard value includes: each wall bushing produced by the factory will record the standard humidity value and standard resistance value used, and the standard humidity value is used as the preset humidity standard value, and the standard resistance value is used as the preset resistance standard value. Considering that the preset humidity standard value is used to reflect the standard humidity of the wall bushing, when the humidity of the wall bushing is not greater than the preset humidity standard value, it means that the insulation of the wall bushing is basically not affected by humidity; the preset resistance standard value is used to reflect the insulation standard of the wall bushing, and when the humidity of the wall bushing is not less than the preset resistance standard value, it means that the wall bushing has good insulation. It should be noted that when the resistance value of the wall bushing is not less than the preset resistance standard value, it means that the insulation performance of the wall bushing is good, and there is no need to analyze the insulation performance abnormality caused by the damage of the wall bushing, and the insulation damage performance of the wall bushing is set to 0.

[0049] For the above steps, the wall bushings with resistance values ​​less than the preset resistance standard value are taken as the initial wall bushings to be analyzed: the purpose is to identify those wall bushings with abnormal insulation performance, that is, the wall bushings with resistance values ​​lower than the standard, so as to perform subsequent dehumidification; the iterative step, i.e., the dehumidification operation (2), sets the dehumidification time based on the degree of dehumidification required, thereby ensuring the dehumidification effect while avoiding unnecessary energy consumption, and the preset iteration termination condition is set based on the humidity value. When the humidity value before dehumidification is not greater than the preset humidity standard value, it is considered that the dehumidification process is sufficient and no additional dehumidification operation is required.

[0050] Considering that different dehumidification times may have different effects on the insulation performance of the wall bushing, the optimal dehumidification time can be determined by performing multiple dehumidification operations and observing the changes in insulation resistance and humidity after each dehumidification. This time should be able to ensure the dehumidification effect while avoiding unnecessary energy consumption or equipment damage caused by excessive dehumidification.

[0051] Preferably, in one embodiment of the present invention, considering that the greater the humidity value before dehumidification is than the preset humidity standard value, the greater the degree of dehumidification required, the calculation of the dehumidification time takes into account the difference between the humidity value before dehumidification and the preset humidity standard value, ensuring that the dehumidification time is neither too long nor too short, thereby ensuring the dehumidification effect and avoiding unnecessary energy consumption and equipment damage. The method for obtaining the dehumidification time includes:

[0052] Calculate the difference between the humidity value before dehumidification and the preset humidity standard value and normalize them to obtain the humidity measurement; calculate the product of the preset adjustment time and the humidity measurement to obtain the adjustment time; calculate the sum of the adjustment time and the preset reference time to obtain the dehumidification time. In one embodiment of the present invention, the preset reference time is 30, and the preset adjustment time is 45, which can be set by the implementer according to the implementation scenario. In one embodiment of the present invention, the normalization method is: use the norm normalization function for normalization, and limit the value range to between 0 and 1.

[0053] After the dehumidification operation is completed, a test operation will be performed. The test operation is to sample the resistance value of the wall bushing using the resistance detection module 02 according to a preset frequency, obtain a preset number of resistance values, count all resistance values ​​during the test process, and obtain a test data set during the test process. In one embodiment of the present invention, sampling is performed according to a preset frequency, the preset frequency is 1 second / time, and the preset number is 60, which can be set by the implementer according to the implementation scenario.

[0054] It should be noted that, in order to facilitate calculation, all indicator data involved in the calculation in the embodiment of the present invention are preprocessed to eliminate the dimension effect. The specific means of eliminating the dimension effect are technical means well known to those skilled in the art and are not limited here.

[0055] Step S2: According to the difference in humidity values ​​before and after dehumidification during the dehumidification process, obtain the humidity change index of the dehumidification process; according to the difference in resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value, obtain the insulation improvement index of the dehumidification process; according to the humidity change index and insulation improvement index of all dehumidification processes, obtain the humidity influence of the wall bushing.

[0056] In order to analyze the degree of insulation performance degradation caused by humidity factors, the effect of the dehumidification process is reflected by the humidity change index. The larger the humidity change index, the more obvious the humidity reduction. Resistance value is an important parameter for measuring insulation performance. A high resistance value usually indicates better insulation performance. The insulation improvement index of the dehumidification process is obtained according to the difference between the resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value. The larger the insulation improvement index, the larger the resistance value becomes due to the dehumidification process and the closer the resistance value after dehumidification is to the preset resistance standard value, which means that the dehumidification process improves the insulation performance more obviously. The humidity influence degree reflects the influence of humidity on the insulation performance of the wall bushing. The larger the humidity influence degree value, the more obvious the influence of humidity on the insulation performance of the wall bushing.

[0057] In order to analyze the humidity reduction effect brought about by the dehumidification process, preferably, in one embodiment of the present invention, the method for obtaining the humidity change index includes: calculating the absolute value of the difference between the humidity values ​​before and after dehumidification to obtain the humidity change index of the dehumidification process. In other embodiments of the present invention, the absolute value of the difference between the humidity values ​​before and after dehumidification can also be calculated, and the ratio of the absolute value of the difference to the preset humidity standard value can be calculated to obtain the humidity change index of the dehumidification process.

[0058] For the above steps, the humidity change index is an important indicator to measure the dehumidification effect, which directly reflects the degree of reduction of the humidity of the wall bushing by the dehumidification operation. The larger the humidity change index, the more obvious the degree of humidity reduction.

[0059] In order to analyze the insulation improvement effect brought about by the dehumidification process, preferably, in one embodiment of the present invention, a method for obtaining an insulation improvement index includes:

[0060] The absolute value of the difference between the resistance value after dehumidification and the resistance value before dehumidification is calculated to obtain the insulation resistance difference; the ratio of the resistance value after dehumidification to the preset resistance standard value is calculated to obtain the resistance normality after dehumidification; the product of the insulation resistance difference and the resistance normality after dehumidification is calculated to obtain the insulation improvement index.

[0061] Regarding the above steps, if the resistance value of the bushing is significantly increased after dehumidification, and the resistance value after dehumidification reaches the insulation standard, then the insulation performance of the wall bushing after dehumidification will be relatively normal, indicating that this dehumidification operation has a significant positive improvement effect on the insulation performance of the bushing, and the insulation improvement index is obtained, so that the insulation improvement index can more comprehensively evaluate the improvement effect of the dehumidification operation on the insulation performance.

[0062] In order to analyze the influence of humidity on insulation performance, preferably, in one embodiment of the present invention, a method for obtaining the influence of humidity includes:

[0063] According to the humidity change index and insulation improvement index of the dehumidification process, the local humidity impact index of the dehumidification process is obtained; the insulation improvement index and the local humidity impact index are positively correlated; the humidity change index and the local humidity impact index are negatively correlated;

[0064] The local humidity impact indicators of all dehumidification processes are integrated to obtain the humidity impact degree.

[0065] Specifically, the sum of the humidity change index and the preset denominator adjustment index is calculated, the ratio of the insulation improvement index to the sum is calculated, and the local humidity impact index of the dehumidification process is obtained; the cumulative value of the local humidity impact index of all dehumidification processes is calculated to obtain the humidity impact degree. In one embodiment of the present invention, the preset denominator adjustment index is 0.01, and the implementer can set it according to the implementation scenario.

[0066] For the above steps, the local humidity impact index reflects the contribution of humidity changes to the improvement of insulation performance during the dehumidification process. The humidity impact degree is obtained by comprehensively evaluating the local humidity impact index of each dehumidification process. The humidity impact degree more comprehensively reflects the influence of humidity on insulation performance.

[0067] Step S3: according to the numerical distribution of all resistance values ​​during the test, the product damage influence of the wall bushing is obtained; according to the product damage influence and the humidity influence, the insulation damage performance of the wall bushing is detected.

[0068] Considering that product damage may change the internal structure of the wall bushing, thus causing instability in the values ​​of all resistance values ​​during the test, and that product damage to the wall bushing often leads to a decrease in resistance, the product damage impact of the wall bushing is obtained; the smaller the product damage impact, the healthier the internal structure of the wall bushing is and the less likely it is to cause product loss; the product damage impact preliminarily reflects the degree of insulation performance degradation caused by internal factors of the equipment; and the humidity impact reflects the degree of insulation performance degradation caused by humidity factors. The insulation damage performance of the wall bushing is obtained by combining the product damage impact and humidity impact; the insulation damage performance more accurately reflects the degree of insulation performance abnormality caused by product damage.

[0069] To preliminarily analyze the degree of insulation degradation caused by internal factors of the equipment, refer to Figure 4 , which shows a flow chart of a method for obtaining a product damage impact provided in one embodiment of the present invention. Preferably, in one embodiment of the present invention, the method for obtaining a product damage impact includes:

[0070] Step S301: obtaining the overall resistance value of the test according to the overall distribution of all resistance values ​​during the test.

[0071] The overall resistance value of the test reflects the overall performance of all resistance values ​​during the test.

[0072] In one embodiment of the present invention, the average of all resistance values ​​during the test is calculated to obtain the overall resistance value of the test.

[0073] Step S302: obtaining damage parameters according to the difference between the preset resistance standard value and the tested overall resistance value.

[0074] The damage parameter is used to quantify the change in resistance caused by damage. If the overall resistance value of the test is lower than the preset resistance standard value, it means that the wall bushing is damaged. The larger the difference, the more serious the damage. If the difference is greater than 0, it means that the insulation resistance is damaged after the dehumidification operation. The difference is used as the damage parameter to quantify the degree of damage. If the difference is not greater than 0, it means that the insulation resistance is not damaged after the dehumidification operation, and the damage parameter is set to 0.

[0075] In one embodiment of the present invention, a method for obtaining damage parameters includes:

[0076] Calculate the preset resistance standard value minus the overall resistance value to obtain the difference. When the difference is greater than 0, the difference is used as the damage parameter of the overall resistance value of the test; when the difference is not greater than 0, the damage parameter is set to 0.

[0077] Step S303: obtaining a test resistance fluctuation parameter according to fluctuations of all resistance values ​​during the test process.

[0078] The test resistance fluctuation parameter reflects the fluctuation of the resistance value during the test process. The larger the value of the test resistance fluctuation parameter is, the greater the fluctuation is.

[0079] In one embodiment of the present invention, the variance of all resistance values ​​during the test is used as the test resistance fluctuation parameter.

[0080] Step S304: Obtain the product damage impact of the wall bushing according to the damage parameter and the test resistance fluctuation parameter.

[0081] Considering that product damage may cause the internal structure of the wall bushing to change, thus leading to the instability of the values ​​of all resistance values ​​during the test, and that product damage to the wall bushing often leads to a decrease in resistance after dehumidification, the impact of product damage on the wall bushing is obtained; the smaller the impact of product damage, the healthier the internal structure of the wall bushing, and the less likely product loss will occur.

[0082] In one embodiment of the present invention, the product of the damage parameter and the test resistance fluctuation parameter is calculated to obtain the product damage influence of the wall bushing.

[0083] In order to more accurately reflect the degree of insulation performance abnormality caused by product damage, preferably, in one embodiment of the present invention, the method for obtaining insulation damage performance includes:

[0084] The absolute value of the difference between the resistance value before dehumidification in the first dehumidification process and the preset resistance standard value is calculated to obtain the insulation abnormality degree;

[0085] The sum of the humidity influence and the preset denominator adjustment is calculated to obtain a first parameter; the ratio of the insulation abnormality to the first parameter is calculated to obtain a second parameter; the product of the second parameter and the product damage influence is calculated to obtain a third parameter; the third parameter is normalized to obtain the insulation damage performance of the wall bushing. In one embodiment of the present invention, the normalization method is: normalization is performed using the norm normalization function to limit the value range to between 0 and 1, the preset denominator adjustment is used to ensure that the denominator is not 0, and the preset denominator adjustment is a number greater than 0. This embodiment sets it to 0.001, and the implementer can set it according to the implementation scenario.

[0086] With respect to the above steps, considering that the resistance value before dehumidification of the first dehumidification process can reflect the insulation performance of the wall bushing in the environment, the absolute value of the difference between the resistance value before dehumidification of the first dehumidification process and the preset resistance standard value can reflect the abnormality of the insulation performance of the wall bushing in the environment. The larger the absolute value of the difference, the greater the abnormality of the insulation performance of the wall bushing in the environment; considering that the greater the humidity influence, the greater the abnormality of the insulation performance of the wall bushing in the environment caused by humidity, the second parameter is used to reduce the influence of humidity on the insulation abnormality to reflect the abnormal insulation performance caused by product damage; at the same time, considering that the product damage influence preliminarily reflects the abnormality of the insulation performance caused by internal factors of the equipment, the insulation damage performance of the wall bushing is obtained; the insulation damage performance more accurately reflects the degree of abnormal insulation performance caused by product damage.

[0087] The present invention also provides a method for detecting the insulation performance of a wall bushing, and the method uses an insulation performance detection device for a wall bushing proposed by the present invention for detection.

[0088] In summary, the embodiment of the present invention provides an insulation performance detection device and method for a wall bushing. First, according to the difference in humidity values ​​before and after dehumidification during the dehumidification process, a humidity change index of the dehumidification process is obtained; according to the difference in resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value, an insulation improvement index of the dehumidification process is obtained; according to the humidity change index and insulation improvement index of all dehumidification processes, the humidity influence of the wall bushing is obtained; according to the numerical distribution of all resistance values ​​during the test process, the product damage influence of the wall bushing is obtained; according to the product damage influence and humidity influence, the insulation damage performance of the wall bushing is detected. In the embodiment of the present invention, the influence of product damage and humidity on product insulation is deeply analyzed to more accurately analyze the insulation performance abnormality caused by product damage of the wall bushing.

[0089] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0090] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A wall bushing insulation performance testing device, characterized in that: The detection device includes a humidity detector for collecting humidity values ​​of the wall bushing, a resistance detection module for collecting resistance values ​​of the wall bushing, a hot air blower for dehumidifying the wall bushing, and a detector for detecting insulation damage performance. The detector is connected to the humidity detector, the resistance detection module and the hot air blower to obtain the humidity value and resistance value of the wall bushing during the dehumidification process and the test process, and detects the insulation damage performance according to the humidity value and resistance value during the dehumidification process and the test process. The insulation damage performance detection process includes: According to the difference between the humidity value and the preset humidity standard value, a dehumidification operation is performed to obtain all dehumidification processes of the wall bushing; according to the difference between the humidity values ​​before and after dehumidification in the dehumidification process, a humidity change index of the dehumidification process is obtained; according to the difference between the resistance values ​​before and after dehumidification, and the deviation of the resistance value after dehumidification from the preset resistance standard value, an insulation improvement index of the dehumidification process is obtained; according to the humidity change index and the insulation improvement index of all the dehumidification processes, the humidity influence of the wall bushing is obtained; According to the numerical distribution of all resistance values ​​during the test, the product damage influence of the wall bushing is obtained; according to the product damage influence and the humidity influence, the insulation damage performance of the wall bushing is detected; The method for obtaining the insulation improvement index includes: Calculate the absolute value of the difference between the resistance value after dehumidification and the resistance value before dehumidification to obtain the insulation resistance difference; calculate the ratio of the resistance value after dehumidification to the preset resistance standard value to obtain the resistance normality after dehumidification; calculate the product of the insulation resistance difference and the resistance normality after dehumidification to obtain the insulation improvement index; The method for obtaining the humidity influence degree includes: According to the humidity change index and the insulation improvement index of the dehumidification process, a local humidity impact index of the dehumidification process is obtained; the insulation improvement index and the local humidity impact index are positively correlated; the humidity change index and the local humidity impact index are negatively correlated; Comprehensively analyze the local humidity impact indicators of all dehumidification processes to obtain the humidity impact degree; The method for obtaining the product damage impact includes: According to the overall distribution of all resistance values ​​during the test, the overall resistance value of the test is obtained; According to the difference between the preset resistance standard value and the tested overall resistance value, the damage parameter is obtained; According to the fluctuation of all resistance values ​​during the test, the test resistance fluctuation parameter is obtained; Obtaining the product damage impact of the wall bushing according to the damage parameter and the test resistance fluctuation parameter; The method for obtaining the insulation damage performance includes: The absolute value of the difference between the resistance value before dehumidification in the first dehumidification process and the preset resistance standard value is calculated to obtain the insulation abnormality degree; The sum of the humidity influence and the preset denominator adjustment is calculated to obtain the first parameter; the ratio of the insulation abnormality to the first parameter is calculated to obtain the second parameter; the product of the second parameter and the product damage influence is calculated to obtain the third parameter; the third parameter is normalized to obtain the insulation damage performance of the wall bushing.

2. The insulation performance testing device for a wall bushing according to claim 1, characterized in that: The method for obtaining the dehumidification process includes: The wall bushing with a resistance value less than the preset resistance standard value is taken as the initial wall bushing to be analyzed; the wall bushing to be analyzed is dehumidified according to the preset dehumidification criterion to obtain each updated wall bushing to be analyzed during the dehumidification process; the dehumidification operation is repeated until the wall bushing to be analyzed meets the preset iteration termination condition and the dehumidification is stopped, and all dehumidification processes of the wall bushing are obtained; The preset dehumidification criteria include: if the humidity value before dehumidification is greater than the preset humidity standard value, according to the difference between the humidity value before dehumidification and the preset humidity standard value, the dehumidification time of the dehumidification process is obtained, and the working time of the hot air blower is set according to the dehumidification time to perform dehumidification operation on the wall sleeve; the preset iteration termination condition includes: the humidity value before dehumidification is not greater than the preset humidity standard value.

3. The insulation performance testing device for a wall bushing according to claim 2, characterized in that: The method for obtaining the dehumidification time comprises: The difference between the humidity value before dehumidification and the preset humidity standard value is calculated and normalized to obtain the humidity measurement; the product of the preset adjustment time and the humidity measurement is calculated to obtain the adjustment time; the sum of the adjustment time and the preset reference time is calculated to obtain the dehumidification time.

4. The insulation performance testing device for a wall bushing according to claim 1, characterized in that: The method for obtaining the humidity change index includes: The absolute value of the difference between the humidity values ​​before and after dehumidification is calculated to obtain the humidity change index of the dehumidification process.

5. The insulation performance testing device for a wall bushing according to claim 1, characterized in that: The method for obtaining the damage parameters includes: The preset resistance standard value minus the overall resistance value of the test is calculated to obtain a difference. When the difference is greater than 0, the difference is used as the damage parameter of the overall resistance value of the test; when the difference is not greater than 0, the damage parameter is set to 0.

6. A method for detecting the insulation performance of a wall bushing, characterized in that: The method uses an insulation performance testing device for a wall bushing as described in any one of claims 1 to 5 for testing.

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