Moisture simulation device, moisture detection platform and moisture detection method for surge arrester

Abstract

The application provides a moisture simulation device of a lightning arrester, a moisture detection platform and a moisture detection method. The moisture simulation device comprises an air pump, an epoxy cylinder, a plurality of valve plates of the lightning arrester and an ultrasonic humidifier. The plurality of valve plates are installed in the epoxy cylinder. At least one outlet valve is arranged on one side of the epoxy cylinder, and at least one inlet valve is arranged on the other side of the epoxy cylinder. The ultrasonic humidifier is connected with the inlet valve through a pipeline, and the air pump is connected with the outlet valve through a pipeline. The simulation of moisture of the plurality of valve plates is completed by controlling the opening and closing of the inlet valve and the outlet valve. The moisture simulation device of the lightning arrester can truly simulate the moisture simulation of the lightning arrester, greatly improves the speed and efficiency of the simulation of the moisture of the lightning arrester, effectively diagnoses whether the lightning arrester is internally damp by using the moisture detection platform, and improves the accuracy of the moisture fault detection of the lightning arrester.

Description

Technical Field

[0001] This application relates to the field of surge arrester technology, and in particular to a surge arrester moisture simulation device, a moisture detection platform, and a moisture detection method. Background Technology

[0002] During train operation, the surge arresters of high-speed trains are subject to frequent vibrations, severe weather conditions such as rain and snow, operational overvoltages, and lightning impulse overvoltages. Under the combined effects of electric heating, vibration, and humidity, the surge arresters may become damp, which can lead to an increase in the resistive leakage current flowing through the on-board surge arresters, aggravated power loss, and cause the temperature of the zinc oxide varistor of the on-board surge arresters to rise or even thermal collapse, ultimately resulting in an explosion accident, thus affecting the safe operation of the train.

[0003] Currently, due to the sealed nature of surge arresters in high-speed trains and the slow process of moisture absorption, there are few methods for simulating moisture absorption. Furthermore, the process of moisture-induced faults within surge arresters is complex and cannot be diagnosed or definitively concluded using a single detection method. Conventional moisture-induced fault assessment criteria are also lenient and insensitive to changes in key parameters. Therefore, improving the accuracy of moisture detection for surge arresters has become a significant technical challenge. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a surge arrester moisture simulation device, a moisture detection platform, and a moisture detection method. The surge arrester moisture simulation device can realistically simulate the moisture of the surge arrester, which can greatly improve the speed and efficiency of the surge arrester moisture simulation. The moisture detection platform can effectively diagnose whether the surge arrester is internally damp, thus improving the accuracy of surge arrester moisture fault detection.

[0005] This application provides a moisture simulation device for a surge arrester, which includes an air pump, an epoxy cylinder, multiple valve plates of the surge arrester, and an ultrasonic humidifier; wherein...

[0006] Multiple valve plates are installed inside the epoxy cylinder, and at least one outlet valve is provided on one side of the epoxy cylinder and at least one inlet valve is provided on the other side of the epoxy cylinder.

[0007] The ultrasonic humidifier is connected to the inlet valve via a pipe, and the air pump is connected to the outlet valve via a pipe. By controlling the opening and closing of the inlet valve and the outlet valve, the simulated moisture absorption of multiple valve plates is achieved.

[0008] In one possible implementation, the moisture simulation device further includes at least one removable partition, which is installed near the valve plate at a preset position to simulate moisture absorption of the valve plate at different positions.

[0009] In one possible implementation, the moisture detection platform includes a surge arrester assembled with multiple valve plates (simulated by the surge arrester's moisture simulation device), a DC electrical measurement module, and an AC electrical measurement module; wherein the DC electrical measurement module includes a high-voltage DC power supply and a microammeter; the AC electrical measurement module includes a power frequency experimental transformer, a variable resistance box, and an oscilloscope; wherein...

[0010] The high-voltage terminal of the surge arrester is electrically connected to the high-voltage DC power supply, the low-voltage terminal of the surge arrester is electrically connected to the negative terminal of the microammeter, and the positive terminal of the microammeter is grounded.

[0011] The high-voltage end of the surge arrester is electrically connected to the power frequency test transformer, the low-voltage end of the surge arrester is electrically connected to the first end of the variable resistor box, the second end of the variable resistor box is electrically connected to the oscilloscope, and the third end of the variable resistor box is grounded.

[0012] This application embodiment also provides a method for detecting moisture in a surge arrester, the method being applied to a moisture detection platform for surge arresters, the method comprising:

[0013] Obtain the surge arrester to be tested;

[0014] DC electrical measurements are performed on the surge arrester under test to determine the target DC voltage, target leakage current, and target nonlinear coefficient of the surge arrester under test. The DC electrical measurements include DC voltage detection, leakage current detection, and VI curve testing of the surge arrester under test.

[0015] AC electrical measurements are performed on the surge arrester under test to determine the target total current and target resistive current of the surge arrester under test. The AC electrical measurements are the total current detection and resistive current detection of the surge arrester under test under continuous operating voltage.

[0016] Based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current, it is determined whether the surge arrester under test is damp.

[0017] In one possible implementation, determining whether the surge arrester under test is damp based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current includes:

[0018] The detection process includes checking whether the first rate of change between the target DC voltage and the standard DC voltage of the normal surge arrester is greater than a first preset rate of change of voltage; whether the second rate of change between the target leakage current and the standard leakage current of the normal surge arrester is greater than a first preset rate of change of leakage current; whether the third rate of change between the target nonlinear coefficient and the standard nonlinear coefficient of the normal surge arrester is greater than a first preset rate of change of nonlinear coefficient; whether the target total current is greater than the standard total current of the normal surge arrester; and whether the resistive current is greater than the standard resistive current of the normal surge arrester.

[0019] If both are true, then the surge arrester under test is damp;

[0020] If at least one is negative, then the surge arrester under test is not damp.

[0021] In one possible implementation, after determining whether the surge arrester under test is damp based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current, the dampness detection method further includes:

[0022] If it is determined that the surge arrester under test is damp, the degree of dampness of the surge arrester under test is determined according to the first rate of change, the second rate of change, and the third rate of change.

[0023] The degree of dampness includes first-level dampness, second-level dampness, and third-level dampness.

[0024] In one possible implementation, the degree of moisture absorption of the surge arrester under test is determined to be Level 1 moisture absorption through the following steps:

[0025] Detect whether the first rate of change is greater than the second preset voltage rate of change, whether the second rate of change is greater than the second preset leakage current rate of change, and whether the third rate of change is greater than the second preset nonlinear coefficient rate of change;

[0026] If neither is true, then the moisture level of the surge arrester under test is classified as Level 1 moisture.

[0027] Wherein, the second preset voltage change rate is greater than the first preset voltage change rate, the second preset leakage current change rate is greater than the first preset leakage current change rate, and the second preset nonlinear coefficient change rate is greater than the first preset nonlinear coefficient change rate.

[0028] In one possible implementation, the degree of moisture absorption of the surge arrester under test is determined to be either level two or level three through the following steps:

[0029] Detect whether the first rate of change is greater than the third preset voltage rate of change, whether the second rate of change is greater than the third preset leakage current rate of change, and whether the third rate of change is greater than the third preset nonlinear coefficient rate of change.

[0030] If neither is true, then the moisture level of the surge arrester under test is level two.

[0031] If both are true, then the moisture level of the surge arrester under test is level three.

[0032] Wherein, the third preset voltage change rate is greater than the second preset voltage change rate, the third preset leakage current change rate is greater than the second preset leakage current change rate, and the third preset nonlinear coefficient change rate is greater than the second preset nonlinear coefficient change rate.

[0033] This application also provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the above-described method for detecting moisture in a surge arrester are performed.

[0034] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the above-described method for detecting moisture in a surge arrester.

[0035] This application provides a moisture simulation device, a moisture detection platform, and a moisture detection method for surge arresters. The moisture simulation device includes an air pump, an epoxy cylinder, multiple valve plates of the surge arrester, and an ultrasonic humidifier. Multiple valve plates are installed inside the epoxy cylinder. At least one outlet valve is provided on one side of the epoxy cylinder, and at least one inlet valve is provided on the other side. The ultrasonic humidifier is connected to the inlet valve via a pipe, and the air pump is connected to the outlet valve via a pipe. Simulated moisture absorption of the multiple valve plates is achieved by controlling the opening and closing of the inlet and outlet valves. The surge arrester moisture simulation device can realistically simulate the moisture absorption of surge arresters, significantly improving the speed and efficiency of simulated moisture absorption. The moisture detection platform can effectively diagnose whether the surge arrester is internally damp, improving the accuracy of surge arrester moisture fault detection.

[0036] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is one of the structural schematic diagrams of a surge arrester moisture simulation device provided in an embodiment of this application;

[0039] Figure 2 A second schematic diagram of a moisture simulation device for a surge arrester provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the structure of a surge arrester moisture detection platform provided in an embodiment of this application;

[0041] Figure 4 A flowchart of a method for detecting moisture in a surge arrester is provided in an embodiment of this application;

[0042] Figure 5 This is a schematic diagram of the VI curve test results provided in the embodiments of this application;

[0043] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0044] Icons: 100-Surge arrester moisture simulation device; 110-Air pump; 120-Epoxy cylinder; 130-Valve plate; 140-Ultrasonic humidifier; 150-Removable partition; 300-Surge arrester moisture detection platform; 310-Surge arrester; 320-DC electrical measurement module; 321-High voltage DC power supply; 322-Microammeter; 330-AC electrical measurement module; 331-Power frequency experimental transformer; 332-Variable resistance box; 333-Oscilloscope; 600-Electronic equipment; 610-Processor; 620-Memory; 630-Bus. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0046] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] To enable those skilled in the art to use the content of this application and in conjunction with the specific application scenario of "moisture detection of surge arresters", the following implementation method is provided. For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application.

[0048] The methods, apparatus, electronic devices, or computer-readable storage media described in this application can be applied to any scenario requiring moisture detection of surge arresters. This application does not limit specific application scenarios. Any scheme using the moisture simulation device, moisture detection platform, and moisture detection method provided in this application is within the protection scope of this application.

[0049] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of surge arrester technology.

[0050] Research has revealed that, currently, due to the sealed nature of surge arresters in high-speed trains and the slow process of moisture absorption, there are few methods available for simulating moisture absorption. Furthermore, the process of moisture-induced faults within surge arresters is complex and cannot be diagnosed or definitively concluded using a single detection method. Conventional moisture-induced fault assessment criteria are also lenient and insensitive to changes in key parameters. Therefore, improving the accuracy of moisture detection for surge arresters has become a significant technical challenge.

[0051] Based on this, the embodiments of this application provide a surge arrester moisture simulation device, a moisture detection platform, and a moisture detection method. The surge arrester moisture simulation device can realistically simulate the moisture of the surge arrester, which can greatly improve the speed and efficiency of simulating the moisture of the surge arrester. The moisture detection platform can effectively diagnose whether the surge arrester is internally damp, thus improving the accuracy of surge arrester moisture fault detection.

[0052] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of a surge arrester moisture simulation device provided in an embodiment of this application. For example... Figure 1 As shown in the figure, the surge arrester moisture simulation device 100 provided in this application embodiment includes an air pump 110, an epoxy cylinder 120, multiple valve plates 130 of the surge arrester, and an ultrasonic humidifier 140.

[0053] Specifically, multiple valve plates 130 are installed inside the epoxy cylinder 120. At least one outlet valve is provided on one side of the epoxy cylinder 120, and at least one inlet valve is provided on the other side of the epoxy cylinder 120. The ultrasonic humidifier 140 is connected to the inlet valve through a pipe, and the air pump 110 is connected to the outlet valve through a pipe. The simulated moisture absorption of the multiple valve plates 130 is achieved by controlling the opening and closing of the inlet valve and the outlet valve.

[0054] Here, the valve plate refers to the valve plate removed after the surge arrester is disassembled; there may be multiple valve plates.

[0055] In one example, the epoxy cylinder 120 can be a cylinder with an outer diameter of 60mm, an inner diameter of 58mm, a height of 350mm, and a top cover diameter of 1mm. A first inlet valve (3mm from the top of the epoxy cylinder 120), a second inlet valve (170mm from the top of the epoxy cylinder 120), and a third inlet valve (3mm from the bottom of the epoxy cylinder 120) are installed on the right side of the epoxy cylinder 120. The three inlets of these three inlet valves are all 30mm in diameter. The inlet valves control the entry of moisture. The system is closed. Parameters are set via the ultrasonic humidifier 140 to control the humidity inside the simulated surge arrester. A first outlet valve (3mm from the top of the epoxy cylinder 120), a second outlet valve (170mm from the top of the epoxy cylinder 120), and a third outlet valve (3mm from the bottom of the epoxy cylinder 120) are located on the left side of the epoxy cylinder 120. The outlet diameter of each of the three valves is 20mm. The air output is controlled by the air pump 110, achieving cyclic control. The inlet and outlet settings ensure uniform internal humidity.

[0056] For further information, please refer to [link / reference]. Figure 2 , Figure 2This is a second schematic diagram of the structure of a surge arrester moisture simulation device 100 provided in an embodiment of this application. (See attached diagram.) Figure 2 As shown, the moisture simulation device also includes at least one removable partition 150, which is installed near the valve plate 130 at a preset position to simulate moisture on the valve plate 130 at different positions.

[0057] Here, the valve plate 130 in the preset position can be the third valve plate 130 or the eighth valve plate 130.

[0058] The removable partition 150 can be made of epoxy resin, with a thickness of 2mm and a bottom diameter of 62mm, to simulate moisture in different locations.

[0059] Here, the moisture absorption process of the multiple valve plates 130 of the surge arrester simulated by the surge arrester moisture simulation device 100 is as follows:

[0060] (1) Simulate overall dampness:

[0061] Without installing the removable partition 150, the inlet and outlet valves are opened, and the parameters are set through the ultrasonic humidifier 140 to control the internal humidity of the valve plate 130 of the simulated lightning arrester. The air output is controlled by the air pump 110 to achieve cyclic control. The inlet and outlet settings can make the internal humidity uniform.

[0062] (2) Simulate moisture in different locations:

[0063] The surge arrester's moisture simulation device has over 100 openings, with different air inlets representing different moisture-prone areas: areas susceptible to moisture include: the release port (with a central opening); the top of the high-pressure side (opening to the top); and the low-pressure side (opening to the bottom). Valve plates 130 are numbered, with those closer to the high-pressure side designated as number 1 and those closer to the low-pressure side designated as number 12. In actual engineering: if moisture enters from the high-pressure side, valve plates 130 (1-3) are severely damp; if moisture enters from the release port, valve plates 130 (4-8) are severely damp; and if moisture enters from the low-pressure side, valve plates 130 (9-12) are relatively severely damp. This simulation of moisture absorption in different areas is achieved by installing removable partitions under the third and eighth valve plates 130.

[0064] Common methods for simulating moisture points include:

[0065] ① Simulate high-pressure end moisture: Inlet valve No. 1 is connected to ultrasonic humidifier 140 through a pipe with an air inlet valve, and outlet valve No. 1 is connected to air pump 110 through a pipe with an air outlet valve.

[0066] ② Simulate moisture at the vent: Inlet valve No. 2 is connected to ultrasonic humidifier 140 through a pipe with an air inlet valve, and outlet valve No. 2 is connected to air pump 110 through a pipe with an air outlet valve.

[0067] ③ Simulate low-pressure end moisture: Inlet valve No. 3 is connected to ultrasonic humidifier 140 through a pipe with an air inlet valve, and outlet valve No. 2 is connected to air pump 110 through a pipe with an air outlet valve.

[0068] This application provides a moisture simulation device 100 for surge arresters. The device includes an air pump 110, an epoxy cylinder 120, multiple valve plates 130 of the surge arrester, and an ultrasonic humidifier 140. The multiple valve plates 130 are installed inside the epoxy cylinder 120. At least one outlet valve is provided on one side of the epoxy cylinder 120, and at least one inlet valve is provided on the other side. The ultrasonic humidifier 140 is connected to the inlet valve via a pipe, and the air pump 110 is connected to the outlet valve via a pipe. Simulated moisture absorption of the multiple valve plates 130 is achieved by controlling the opening and closing of the inlet and outlet valves. This device can realistically simulate moisture defects in surge arresters and perform corresponding performance tests. It can significantly improve the speed and efficiency of simulated moisture absorption in surge arresters.

[0069] Please see Figure 3 , Figure 3 This is a structural schematic diagram of a surge arrester moisture detection platform 300 provided in an embodiment of this application. Figure 3 As shown, the surge arrester moisture detection platform 300 includes a surge arrester 310 assembled with multiple valve plates after being simulated by a moisture simulation device for the surge arrester 310, a DC electrical measurement module 320, and an AC electrical measurement module 330; wherein, the DC electrical measurement module 320 includes a high-voltage DC power supply 321 and a microammeter 322; the AC electrical measurement module 330 includes a power frequency experimental transformer 331, a variable resistance box 332, and an oscilloscope 333.

[0070] Specifically, the high-voltage terminal of the surge arrester is electrically connected to the high-voltage DC power supply 321, the low-voltage terminal of the surge arrester 310 is electrically connected to the negative terminal of the microammeter 322, and the positive terminal of the microammeter 322 is grounded; the high-voltage terminal of the surge arrester 310 is electrically connected to the power frequency experimental transformer 331, the low-voltage terminal of the surge arrester 310 is electrically connected to the first terminal of the variable resistance box 332, the second terminal of the variable resistance box 332 is electrically connected to the oscilloscope 333, and the third terminal of the variable resistance box 332 is grounded.

[0071] In a specific embodiment, a DC electrical measurement module 320 is used to perform DC measurements on the surge arrester 310 to obtain the target DC voltage, target leakage current, and target nonlinear coefficient. An AC electrical measurement module is used to perform AC measurements on the surge arrester 310 to obtain the target total current and target resistive current. Using the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current, it can be determined whether the surge arrester under test is damp. If dampness is determined, the dampness level of the surge arrester can also be determined.

[0072] This application provides a moisture detection platform 300 for surge arresters. The platform includes a surge arrester 310 assembled with multiple valve plates, which undergoes simulated moisture absorption via a moisture simulation device; a DC electrical measurement module 320; and an AC electrical measurement module 330. The DC electrical measurement module 320 includes a high-voltage DC power supply 321 and a microammeter 322. The AC electrical measurement module 330 includes a power frequency experimental transformer 331, a variable resistance box 332, and an oscilloscope 333. The high-voltage terminal of the surge arrester 310 is electrically connected to the high-voltage DC power supply 321, and the low-voltage terminal of the surge arrester 310 is electrically connected to the negative terminal of the microammeter 322, with the positive terminal of the microammeter 322 grounded. The high-voltage terminal of the surge arrester 310 is electrically connected to the power frequency test transformer, and the low-voltage terminal of the surge arrester 310 is electrically connected to the first terminal of the variable resistance box 332. The second terminal of the variable resistance box 332 is electrically connected to the oscilloscope 333, and the third terminal of the variable resistance box 332 is grounded. The moisture detection platform can effectively diagnose whether the surge arrester 310 is internally damp, improving the accuracy of moisture fault detection in the surge arrester 310.

[0073] Please see Figure 4 , Figure 4 This application provides a flowchart of a method for detecting moisture in a surge arrester, as illustrated in an embodiment. Figure 4 As shown, the moisture detection method includes:

[0074] S401: Obtain the surge arrester to be tested.

[0075] In this step, the surge arrester to be tested is obtained.

[0076] Here, the surge arrester to be tested can be a surge arrester that has been subjected to moisture simulation by a surge arrester moisture simulation device.

[0077] Among them, the surge arrester can be the surge arrester for the high-speed train.

[0078] S402: Perform DC electrical measurements on the surge arrester under test to determine the target DC voltage, target leakage current, and target nonlinear coefficient of the surge arrester under test. The DC electrical measurements include DC voltage detection, leakage current detection, and VI curve testing on the surge arrester under test.

[0079] In this step, DC electrical measurements are performed on the surge arrester under test to determine the target DC voltage, target leakage current, and target nonlinear coefficient of the surge arrester under test.

[0080] Here, DC electrical measurements refer to DC voltage detection, leakage current detection, and VI curve testing of the surge arrester under test.

[0081] Among them, leakage current detection is a leakage current test at 0.75 times the DC voltage.

[0082] For example, if the DC voltage detection is a DC voltage detection at 1 mA, then the leakage current detection is a leakage current detection at 0.75 times the DC voltage.

[0083] The VI curve is plotted using the vertical axis to represent the DC voltage U and the horizontal axis to represent the leakage current I under the DC voltage. The DC voltage applied to the surge arrester is gradually increased, and then the corresponding leakage current value of the surge arrester is measured. The curve is plotted based on experimental data.

[0084] S403: Perform AC electrical measurements on the surge arrester under test to determine the target total current and target resistive current of the surge arrester under test, wherein the AC electrical measurements are to perform total current detection and resistive current detection on the surge arrester under test under continuous operating voltage.

[0085] In this step, AC electrical measurements are performed on the surge arrester under test to determine the target total current and the target resistive current of the surge arrester under test.

[0086] The AC electrical measurement involves performing full current detection and resistive current detection on the surge arrester under continuous operating voltage.

[0087] S404: Based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current, determine whether the surge arrester under test is damp.

[0088] In this step, the surge arrester under test is determined to be damp based on the target DC voltage, target leakage current, target nonlinear coefficient, target total current, and target resistive current.

[0089] In one possible implementation, determining whether the surge arrester under test is damp based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current includes:

[0090] A: Detect whether the first rate of change between the target DC voltage and the standard DC voltage of the normal surge arrester is greater than the first preset voltage rate of change; whether the second rate of change between the target leakage current and the standard leakage current of the normal surge arrester is greater than the first preset leakage current rate of change; whether the third rate of change between the target nonlinear coefficient and the standard nonlinear coefficient of the normal surge arrester is greater than the first preset nonlinear coefficient rate of change; whether the target total current is greater than the standard total current of the normal surge arrester; and whether the resistive current is greater than the standard resistive current of the normal surge arrester.

[0091] Here, the detection measures whether the first rate of change between the target DC voltage and the standard DC voltage of the normal surge arrester is greater than the first preset rate of change of voltage; whether the second rate of change between the target leakage current and the standard leakage current of the normal surge arrester is greater than the first preset rate of change of leakage current; whether the third rate of change between the target nonlinear coefficient and the standard nonlinear coefficient of the normal surge arrester is greater than the first preset rate of change of nonlinear coefficient; whether the target total current is greater than the standard total current of the normal surge arrester; and whether the resistive current is greater than the standard resistive current of the normal surge arrester.

[0092] Here, the first preset voltage change rate, the first preset leakage current change rate, and the first preset nonlinear coefficient change rate are all set based on expert experience. They can be 5%, the first preset leakage current change rate can be set to 100%, the first preset nonlinear coefficient change rate can be 25%, the standard full current can be 0.5mA, and the standard resistive current can be 0.2mA.

[0093] B: If both are true, then the surge arrester under test is damp.

[0094] C: If at least one is no, then the surge arrester under test is not damp.

[0095] If all of them are true, then the surge arrester under test is damp; if at least one is false, then the surge arrester under test is normal and not damp.

[0096] In a specific embodiment, DC electrical measurements and AC electrical measurements are performed first, and the obtained data is analyzed to determine whether the following conditions are met: target DC voltage U 1mAThe following conditions must be met for the surge arrester to be in normal condition: a significant decrease (more than 5%) in the target leakage current I1 (more than twice its own value or greater than 40 μA), a significant increase in the target nonlinear coefficient B (more than 25%), a significant increase in the target total current Ix under continuous operating voltage (greater than 0.5 mA), and a significant increase in the target resistive current (greater than 0.2 mA or a rate of change exceeding 30%). If these conditions are not met, the surge arrester is considered to be in normal condition. If the above conditions are met, the surge arrester is determined to have experienced a moisture-induced fault.

[0097] In one possible implementation, determining whether the surge arrester under test is damp based on the target DC voltage, the target leakage current, the target nonlinear coefficient, the target total current, and the target resistive current includes:

[0098] If it is determined that the surge arrester under test is damp, the degree of dampness of the surge arrester under test is determined according to the first rate of change, the second rate of change, and the third rate of change.

[0099] Here, if it is determined that the surge arrester under test is damp, the degree of dampness of the surge arrester under test is determined according to the first rate of change, the second rate of change, and the third rate of change.

[0100] Here, the higher the moisture level, the more severe the moisture damage.

[0101] In one possible implementation, the degree of moisture absorption of the surge arrester under test is determined to be Level 1 moisture absorption through the following steps:

[0102] a: Detect whether the first rate of change is greater than the second preset voltage rate of change, whether the second rate of change is greater than the second preset leakage current rate of change, and whether the third rate of change is greater than the second preset nonlinear coefficient rate of change.

[0103] Here, it is detected whether the first rate of change is greater than the second preset voltage rate of change, whether the second rate of change is greater than the second preset leakage current rate of change, and whether the third rate of change is greater than the second preset nonlinear coefficient rate of change.

[0104] b: If neither is true, then the moisture level of the surge arrester under test is Level 1 moisture.

[0105] If neither of these conditions is met, then the moisture level of the surge arrester to be tested is classified as Level 1 moisture.

[0106] Among them, the second preset voltage change rate is greater than the first preset voltage change rate, the second preset leakage current change rate is greater than the first preset leakage current change rate, and the second preset nonlinear coefficient change rate is greater than the first preset nonlinear coefficient change rate.

[0107] Here, if the first preset voltage change rate is 5%, then the second preset voltage change rate can be 15%.

[0108] In one possible implementation, the degree of moisture absorption of the surge arrester under test is determined to be either level two or level three through the following steps:

[0109] i: Detect whether the first rate of change is greater than the third preset voltage rate of change, whether the second rate of change is greater than the third preset leakage current rate of change, and whether the third rate of change is greater than the third preset nonlinear coefficient rate of change.

[0110] Here, it is detected whether the first rate of change is greater than the third preset voltage rate of change, whether the second rate of change is greater than the third preset leakage current rate of change, and whether the third rate of change is greater than the third preset nonlinear coefficient rate of change.

[0111] ii: If both are negative, the moisture level of the surge arrester under test is level two; if both are positive, the moisture level of the surge arrester under test is level three.

[0112] If both are negative, the moisture level of the surge arrester under test is level two; if both are positive, the moisture level of the surge arrester under test is level three.

[0113] Wherein, the third preset voltage change rate is greater than the second preset voltage change rate, the third preset leakage current change rate is greater than the second preset leakage current change rate, and the third preset nonlinear coefficient change rate is greater than the second preset nonlinear coefficient change rate.

[0114] In a specific embodiment, a moisture fault is determined in the surge arrester. Then, the degree of moisture damage is assessed based on a first rate of change, a second rate of change, and a third rate of change. The following judgments are made: whether the first rate of change is greater than or exceeds a second preset voltage rate of change (15%), whether the second rate of change is greater than a second preset leakage current rate of change, and whether the third rate of change exceeds a second preset nonlinear coefficient rate of change (100%). If not, the surge arrester is determined to have experienced Level 1 moisture damage. If so, the following judgments are made: whether the first rate of change is greater than or exceeds a third preset voltage rate of change (25%), whether the second rate of change is greater than a third preset leakage current rate of change, and whether the third rate of change exceeds a third preset nonlinear coefficient rate of change (200%). If not, the surge arrester is determined to have experienced Level 2 moisture damage. If so, the surge arrester is determined to have experienced Level 3 moisture damage.

[0115] For further details, please refer to Figure 5 , Figure 5 This is a schematic diagram of the VI curve test results provided in an embodiment of this application. Figure 5As shown, after the surge vessel becomes damp, the leakage current increases significantly. Under normal conditions, when the applied DC voltage exceeds 30kV, the leakage current can reach approximately 1μA. When the applied DC voltage exceeds 50kV, the leakage current increases significantly with the voltage, exhibiting very obvious nonlinear characteristics. After becoming damp, a leakage current of 1μA appears at approximately 10kV. When the voltage exceeds 20kV, the leakage current consists of two parts: the leakage current of the valve plate body and the leakage current of the cylinder wall. At lower voltages, the leakage current on the cylinder surface dominates, while at 60kV, the leakage current of the valve plate body dominates, and the nonlinear characteristic coefficient of the curve increases compared to the normal condition.

[0116] Here, the nonlinear fitting results of the VI curve are as follows:

[0117] Table 1 Nonlinear coefficients of faults with different degrees of moisture damage

[0118] Moisture content of surge arresters B (Target Nonlinear Coefficient) Dry surge arrester -0.2233 Level 1 dampness -0.01967 Secondary dampness 0.1251 Level 3 dampness 0.258

[0119] As shown in Table 1, the nonlinear coefficient increases after being damp. Compared with normal dry conditions, the change rate of the nonlinear coefficient of the VI curve of the lightly damp surge arrester is 91.2%. Compared with normal dry conditions, the change rate of the nonlinear coefficient of the VI curve of the moderately damp surge arrester is 156.0%. Compared with normal dry conditions, the change rate of the nonlinear coefficient of the VI curve of the heavy surge arrester is 215.5%.

[0120] Here, the DC voltage detection results are as follows:

[0121] Even with Level 1 moisture absorption, the target DC voltage is only 55.2kV, far below the normal requirement of 61.5kV and also below the regulation requirement of 58kV, a decrease of 12.2%. Under Level 2 and Level 3 moisture absorption conditions, the target DC voltage will decrease significantly further, by 22.6% and 29.6% respectively. In other words, when the surge arrester experiences overall moisture absorption, the target DC voltage can effectively detect the moisture condition.

[0122] Here, the leakage current detection results are as follows:

[0123] A normal surge arrester has a leakage current of only about 7 μA at 0.75 times the DC voltage. After becoming damp, the leakage current increases significantly, reaching approximately 47 μA even under level one dampness conditions. The current shows a significant increasing trend with increasing severity of dampness. Therefore, the leakage current at 0.75 times the DC voltage can be used as an important criterion for determining whether a surge arrester is damp.

[0124] Here are the test results for the AC experiment:

[0125] With increasing humidity, the total current tends to increase under the same current conditions. However, under slightly damp conditions, the change in current is not particularly significant compared to dry conditions. Under moderately damp conditions, not only does the total current increase, but its waveform also differs considerably from that under dry conditions. The resistive current values ​​are analyzed here, as shown in Tables 2 and 3.

[0126] Table 2. Values ​​of current characteristic quantities under dry conditions.

[0127] RMS voltage (kV) Target resistive current (mA) 27.50 0.05 34 0.07 42 0.13

[0128] Table 3. Values ​​of current characteristic quantities under moisture conditions.

[0129]

[0130]

[0131] As shown in Tables 2 and 3, the target resistive current increases significantly under damp conditions compared to dry conditions. At effective voltage values ​​of 27.5kV, 34kV, and 42kV, the target resistive current under damp conditions increases by 1020%, 881.4%, and 846.2% respectively compared to the dry condition, all approximately ten times their original value.

[0132] 1. Determine if the problem is caused by moisture:

[0133] When the target leakage current, target total current, and target resistive current all show a significant increase, and the target DC voltage shows a significant decrease, that is, when the target leakage current increases to more than 30μA, the target resistive current increases to more than 120%, and the target DC voltage decreases by more than 50%, it can be determined that the surge arrester has a moisture defect.

[0134] II. Determining the degree of moisture absorption:

[0135] Compared to normal dry conditions, the target nonlinear coefficient change rate of the VI curve of the moisture-damped surge arrester is 91.2%. Compared to normal dry conditions, the target nonlinear coefficient change rate of the VI curve of the secondary moisture-damped surge arrester is 156.0%. Compared to normal dry conditions, the target nonlinear coefficient change rate of the VI curve of the tertiary moisture-damped surge arrester is 215.5%.

[0136] The degree of moisture absorption of a surge arrester can be determined by using the nonlinear coefficient. When the rate of change exceeds 50% but is less than 100%, it can be determined as Class I moisture absorption; when the rate of change exceeds 100% but is less than 200%, it can be determined as Class II moisture absorption; and when the rate of change exceeds 200%, it can be determined as Class III moisture absorption.

[0137] In the first level of moisture absorption, the target DC voltage is only 55.2kV, far below the normal requirement of 61.5kV and also below the regulation requirement of 58kV, a decrease of 12.2%. In the second and third levels of moisture absorption, the target DC voltage will decrease even more significantly, by 22.6% and 29.6% respectively. That is to say, when the surge arrester shows signs of overall moisture absorption, the target DC voltage can effectively detect the moisture absorption situation.

[0138] If the target DC voltage is less than 58kV and decreases by less than 10% (4.83%) compared to 58kV, it can be determined as Level 1 moisture saturation; if the target DC voltage is less than 58kV and decreases by more than 10% but less than 20% (16.03%) compared to 58kV, it can be determined as Level 2 moisture saturation; if the target DC voltage is less than 58kV and decreases by more than 20% (23.6%) compared to 58kV, it can be determined as Level 3 moisture saturation.

[0139] If the target leakage current is less than 30μA (7μA), the surge arrester is in a dry state; if the target leakage current is greater than 40μA but less than 60μA (47μA), the surge arrester is in a first-level moisture state; if the target leakage current is greater than 60μA but less than 100μA (80μA), the surge arrester is in a second-level moisture state; if the target leakage current is greater than 100μA (130μA), the surge arrester is in a third-level moisture state.

[0140] The condition (moisture level) of the surge arrester is shown in the table below:

[0141] Table 4 Classification of Surge Arrestor Status Levels

[0142]

[0143] This application provides a method for detecting moisture in a surge arrester. The method includes: acquiring the surge arrester to be tested; performing DC electrical measurements on the surge arrester to determine its target DC voltage, target leakage current, and target nonlinear coefficient, wherein the DC electrical measurements include DC voltage detection, leakage current detection, and VI curve testing; performing AC electrical measurements on the surge arrester to determine its target total current and target resistive current, wherein the AC electrical measurements include total current detection and resistive current detection under continuous operating voltage; and determining whether the surge arrester is moisture-damaged based on the target DC voltage, target leakage current, target nonlinear coefficient, target total current, and target resistive current. This method enables effective diagnosis of internal moisture in surge arresters using a moisture detection platform, improving the accuracy of surge arrester moisture fault detection.

[0144] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 6 As shown, the electronic device 600 includes a processor 610, a memory 620, and a bus 630.

[0145] The memory 620 stores machine-readable instructions executable by the processor 610. When the electronic device 600 is running, the processor 610 and the memory 620 communicate via the bus 630. When the machine-readable instructions are executed by the processor 610, they can perform the operations described above. Figure 4 The steps of the surge arrester moisture detection method in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0146] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 4 The steps of the surge arrester moisture detection method in the method embodiment shown are described in detail in the method embodiment, and will not be repeated here.

[0147] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0148] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0149] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0150] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0151] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0152] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A platform for detecting moisture in a surge arrester, characterized in that The moisture detection platform comprises a plurality of valve piece assembled lightning arresters subjected to moisture simulation by a moisture simulation device of the lightning arrester, a direct current electrical measurement module and an alternating current electrical measurement module; the direct current electrical measurement module comprises a high-voltage direct current power supply and a micro-ammeter; the alternating current electrical measurement module comprises a power frequency experimental transformer, a variable resistance box and an oscilloscope; the high-voltage end of the lightning arrester is electrically connected to the high-voltage direct current power supply, the low-voltage end of the lightning arrester is electrically connected to the negative electrode end of the micro-ammeter, and the positive electrode end of the micro-ammeter is grounded; the high-voltage end of the lightning arrester is electrically connected to the power frequency experimental transformer, the low-voltage end of the lightning arrester is electrically connected to the first end of the variable resistance box, the second end of the variable resistance box is electrically connected to the oscilloscope, and the third end of the variable resistance box is grounded; the moisture simulation device comprises an air pump, an epoxy cylinder, a plurality of valve pieces of the lightning arrester and an ultrasonic humidifier; the plurality of valve pieces are installed in the epoxy cylinder, at least one outlet valve is arranged on one side of the epoxy cylinder, and at least one inlet valve is arranged on the other side of the epoxy cylinder; the ultrasonic humidifier is connected to the inlet valve through a pipeline, the air pump is connected to the outlet valve through a pipeline, and the moisture simulation of the plurality of valve pieces is completed by controlling the opening and closing of the inlet valve and the outlet valve; the moisture simulation device further comprises at least one detachable partition plate, which is installed near the valve piece at a preset position to realize the moisture simulation of the valve pieces at different positions. The moisture detection method is applied to the moisture detection platform of the lightning arrester of claim 1, and the moisture detection method comprises: obtaining a lightning arrester to be detected; performing direct current electrical measurement on the lightning arrester to be detected to determine the target direct current voltage, target leakage current and target non-linear coefficient of the lightning arrester to be detected, wherein the direct current electrical measurement is direct current voltage detection, leakage current detection and V-I curve test on the lightning arrester to be detected; performing alternating current electrical measurement on the lightning arrester to be detected to determine the target total current and target resistive current of the lightning arrester to be detected, wherein the alternating current electrical measurement is total current detection and resistive current detection under continuous operation voltage of the lightning arrester to be detected; based on the target direct current voltage, the target leakage current, the target non-linear coefficient, the target total current and the target resistive current, it is judged whether the lightning arrester to be detected is subjected to moisture. The judgment of whether the lightning arrester to be detected is subjected to moisture based on the target direct current voltage, the target leakage current, the target non-linear coefficient, the target total current and the target resistive current comprises:

2. A method of detecting moisture absorption of a surge arrester, characterized by, ​ ​ ​ ​ ​ 3. The moisture detection method of claim 2, wherein ​ detecting whether a first variation rate between the target DC voltage and a standard DC voltage of a normal surge arrester, a second variation rate between the target leakage current and a standard leakage current of a normal surge arrester, a third variation rate between the target non-linear coefficient and a standard non-linear coefficient of a normal surge arrester, the target total current and a standard total current of a normal surge arrester, and the target resistive current and a standard resistive current of a normal surge arrester are greater than first preset voltage variation rate, first preset leakage current variation rate, first preset non-linear coefficient variation rate, the standard total current and the standard resistive current respectively; if all are yes, the surge arrester to be detected is damp; if at least one is no, the surge arrester to be detected is not damp.

4. The moisture detection method of claim 3, wherein After determining whether the surge arrester to be detected is damp based on the target DC voltage, the target leakage current, the target non-linear coefficient, the target total current and the target resistive current, the damp detection method further comprises: if it is determined that the surge arrester to be detected is damp, determining the damp degree of the surge arrester to be detected according to the first variation rate, the second variation rate and the third variation rate; wherein the damp degree comprises first-level damp, second-level damp and third-level damp.

5. The moisture detection method of claim 4, wherein The damp degree of the surge arrester to be detected is determined to be first-level damp by the following steps: detecting whether the first variation rate is greater than second preset voltage variation rate, the second variation rate is greater than second preset leakage current variation rate and the third variation rate is greater than second preset non-linear coefficient variation rate; if all are no, the damp degree of the surge arrester to be detected is first-level damp; wherein the second preset voltage variation rate is greater than the first preset voltage variation rate, the second preset leakage current variation rate is greater than the first preset leakage current variation rate and the second preset non-linear coefficient variation rate is greater than the first preset non-linear coefficient variation rate.

6. The moisture detection method of claim 4, wherein The damp degree of the surge arrester to be detected is determined to be second-level damp and third-level damp by the following steps: detecting whether the first variation rate is greater than third preset voltage variation rate, the second variation rate is greater than third preset leakage current variation rate and the third variation rate is greater than third preset non-linear coefficient variation rate; if all are no, the damp degree of the surge arrester to be detected is second-level damp; if all are yes, the damp degree of the surge arrester to be detected is third-level damp; wherein the third preset voltage variation rate is greater than the second preset voltage variation rate, the third preset leakage current variation rate is greater than the second preset leakage current variation rate and the third preset non-linear coefficient variation rate is greater than the second preset non-linear coefficient variation rate.

7. An electronic device, comprising: comprise: a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, the machine readable instructions are executed by the processor to execute the steps of the damp detection method of the surge arrester as claimed in any one of claims 2 to 6.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program performs the steps of the method for detecting moisture of a surge arrester according to any one of claims 2 to 6 when executed by the processor.

Images