An electric arc discharge anti-interference ability evaluation method for live-line work automation equipment

Abstract

The application provides a live working automation equipment arc discharge anti-interference ability evaluation method, comprising setting a standard test environment, establishing an equivalent circuit model of a potential transfer process; obtaining distributed capacitance parameters of an equivalent circuit under the same discharge distance in an actual working environment and the standard test environment, obtaining potential transfer current values of an equivalent test environment under an actual working environment voltage and an equivalent test environment under a standard voltage, and obtaining equivalent test voltages for generating the same potential transfer current; and equivalent potential transfer interference processes of various actual live working environments are carried out in the standard test environment, and equivalent function tests and grading evaluations are carried out. The application is an effective simplified method for evaluating arc discharge anti-interference ability of live working automation equipment, which can save test cost, unify and standardize test methods of different equipment and various actual scenes, and is conducive to implementation of equipment arc discharge anti-interference ability tests and unification of test standards.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic compatibility technology for live-line working, and in particular relates to a method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment. Background Technology

[0002] Live-line working refers to a method of maintenance and testing on high-voltage electrical equipment without interrupting power supply. Electrical equipment requires frequent testing, inspection, and maintenance during long-term operation; live-line working technology allows for uninterrupted operation, thereby improving power supply reliability.

[0003] With the development of technologies such as artificial intelligence, automated equipment such as robots, intelligent tools, and wearable devices are increasingly being used in high-voltage live-line work. These automated devices are usually sent to the vicinity of high-voltage live conductors by humans or by a carrying platform to carry out operations. At this time, the equipment will change from a lower potential to a higher potential, the same as that of the high-voltage live conductor (also known as the "equipotential" process). This process of the equipment entering or leaving the equipotential is called "potential transfer". During potential transfer, a spark discharge phenomenon occurs between the metal part of the automated working equipment and the high-voltage live conductor, which is called "potential transfer discharge", which is a type of arc discharge.

[0004] Potential transfer discharge generates broadband current pulses and drastically changing electromagnetic fields, frequently causing automated live-line working equipment to malfunction, fail to operate, or even burn out electrical components. The higher the voltage level, the stronger the interference generated by this discharge, becoming one of the major obstacles to the widespread application of automated live-line working equipment. Existing electromagnetic protection measures lack specificity, and current electromagnetic compatibility standards do not include testing items for potential transfer interference immunity. The only way to determine whether equipment meets live-line working requirements is to conduct simulation tests in an environment identical to actual work (e.g., a live-line environment). This method has high requirements for test sites and environmental equipment, and involves significant testing costs and manpower. It also presents significant challenges for manufacturers of live-line working equipment to verify their products, making it difficult to implement. Currently, there is a lack of simple and effective methods for testing and evaluating the arc discharge interference immunity of automated live-line working equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment. This method can reduce testing costs, standardize testing standards, and make the evaluation of arc discharge anti-interference capability more accurate.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] Firstly, a method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment includes the following:

[0008] Step 1: Set up a standard experimental environment in the laboratory that can perform equivalent tests of potential transfer, and establish an equivalent circuit model of the potential transfer process;

[0009] Step 2: Obtain the distributed capacitance parameters of the equivalent circuit under the actual working environment and the standard test environment under the same discharge distance, obtain the peak value of the potential transfer current under the actual working environment voltage and the potential transfer current value of the equivalent test environment under the standard voltage, and calculate the equivalent test voltage that produces the same potential transfer current.

[0010] Step 3: Perform equivalent functional tests on the potential transfer interference processes of various actual live-line working environments under the standard laboratory test environment, and evaluate the potential transfer anti-interference performance in a graded manner.

[0011] Furthermore, the standard test environment includes a test voltage source, simulated conductors, insulating supports, insulating lifting devices, and insulating mats.

[0012] The test voltage source is a continuously adjustable AC high-voltage power supply or a DC high-voltage power supply.

[0013] The insulating support is disposed between the simulated wire and the insulating pad. The insulating support is made of an insulating rod. The simulated wire is a cylindrical metal rod with a diameter of 20mm and a length of not less than 4m.

[0014] The insulating lifting device includes an insulating platform and a remote control drive device. The insulating platform is made of insulating material and is installed and fixed on the remote control drive device to support the test sample. The remote control drive device is set on the insulating pad and controls the height of the insulating platform through remote lifting operation to simulate the process of the test sample contacting or detaching from the simulated wire.

[0015] Furthermore, the remote-controlled lifting device also includes a monitoring device for monitoring the lifting height of the insulating platform. The height of the insulating platform above the ground is not less than 2m, and the adjustment accuracy is not greater than 10mm, ensuring precise adjustment of the discharge gap distance.

[0016] Furthermore, the equivalent circuit model includes a voltage source and a distributed capacitance C. 12 Distributed capacitance C 23 Distributed capacitance C 13 Arc resistor g and discharge switches K1 and K2, and the distributed capacitance C 12 Discharge switch K2, distributed capacitance C 23 In series with the distributed capacitance C 13 When connected in parallel to the voltage source and a discharge occurs, the equivalent distributed capacitance C 12 It becomes the equivalent arc resistance g.

[0017] Furthermore, the formula for obtaining the equivalent voltage Us is:

[0018]

[0019] Where U0 is the high-potential node voltage, I m I′ represents the peak instantaneous current flowing through the arc resistance g under standard test conditions. m This represents the peak instantaneous current flowing through the arc resistance g under actual operating conditions.

[0020] Furthermore, the determination of each distributed capacitance value uses the finite element method, with ANSYS software as the auxiliary calculation method.

[0021] Furthermore, the criteria for graded evaluation are as follows:

[0022] Grade A: During the test, no component of the equipment experienced functional failure, damage, or malfunction.

[0023] Grade B: During the test, the equipment function is temporarily reduced or lost, but it can recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, without the need for operator intervention.

[0024] Level C: During the test, the equipment function is temporarily reduced or lost, but it cannot recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, and operator intervention or system reset is required.

[0025] Grade D: During the test, damage to equipment or software, or loss of data, results in irreversible loss of functionality or performance degradation.

[0026] For live-line working environments, equipment with test results reaching Level A can be directly applied to on-site operations; equipment with test results reaching Level B requires further functional evaluation to ensure that temporary functional reduction or loss during on-site operations does not affect the operation before it is used; equipment with Levels C and D cannot be applied to the corresponding live-line working scenarios.

[0027] Furthermore, the specific test procedure for simulating various actual live-line working environments under standard laboratory test conditions is as follows:

[0028] The distance between the device end and the simulated conductor is adjusted by moving the control platform up and down with a drive device. This distance is the typical discharge distance d under the corresponding voltage. The device end is moved closer to the simulated conductor in a fixed step size less than d until it contacts the conductor. Then, the device end moves away from the simulated conductor in the same fixed step size until it returns to the initial position.

[0029] The beneficial effects of this invention are as follows: This invention proposes an equivalent test method for evaluating the anti-interference capability of automated live-line working equipment, specifically addressing arc discharge caused by potential transfer. Using this method, there is no need to establish a real test environment. Instead, the potential transfer interference process in various live-line working scenarios is equivalently represented in a standard laboratory environment. The consistency of the interference magnitude between the test environment and the real working environment is ensured through equivalent calculation of the test voltage. While accurately testing and judging the anti-interference capability of automated live-line working equipment, this method significantly reduces the cost and manpower required for setting up the test environment. It unifies and standardizes the test methods for different equipment and various practical scenarios, making the implementation of potential transfer arc discharge anti-interference capability tests simpler, more convenient, and more efficient, which is beneficial for the formulation of relevant test standards.

[0030] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0032] Figure 1 This is a flowchart of the equivalent test method for arc discharge anti-interference capability provided in the embodiments of the present invention;

[0033] Figure 2 This is the standard test environment for performing potential transfer equivalent tests provided in the embodiments of the present invention;

[0034] Figure 3 This is an equivalent circuit diagram of potential transfer discharge under standard test conditions provided in the embodiments of the present invention;

[0035] Figure 4 This is an equivalent circuit diagram of potential transfer discharge under actual experimental conditions provided in the embodiments of the present invention;

[0036] Figure 5 Electromagnetic transient calculation model diagram of the potential transfer equivalent circuit provided in the embodiments of the present invention;

[0037] Figure 6 The potential transfer current waveform under standard test conditions when the node 1 voltage U0 = 1kV (peak value) is provided in the embodiment of the present invention;

[0038] Figure 7 The potential transfer current waveform diagram of a 10kV line under live working conditions when the node 1 voltage U1 = 9.4kV (peak value) is provided in the embodiment of the present invention.

[0039] Figure 8 After the node 1 voltage conversion provided in this embodiment of the invention, U S The equivalent potential transfer current waveform under standard test conditions at 4.7kV.

[0040] Among them, 1-test voltage source Us; 2-simulated wire; 3-insulating bracket; 4-insulating pad; 5-operation end for contacting live parts; 6-automated live working equipment; 7-remote control drive device; 8-insulating platform. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figure 1 As shown, an embodiment of the present invention provides a method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment, including the following:

[0043] Step 1: Set up a standard experimental environment in the laboratory that can perform equivalent tests of potential transfer, and establish an equivalent circuit model of the potential transfer process;

[0044] Step 2: Obtain the distributed capacitance parameters of the equivalent circuit under the actual working environment and the standard test environment under the same discharge distance, obtain the peak value of the potential transfer current under the actual working environment voltage and the potential transfer current value of the equivalent test environment under the standard voltage, and calculate the equivalent test voltage that produces the same potential transfer current.

[0045] Step 3: Perform equivalent functional tests on the potential transfer interference processes of various actual live-line working environments under the standard laboratory test environment, and evaluate the potential transfer anti-interference performance in a graded manner.

[0046] Example 1, details are as follows:

[0047] Standard test environment for conducting potential transfer equivalent tests, such as Figure 2 As shown, it includes: a test voltage source, simulated wires, an insulating support, an insulating lifting device, and an insulating mat.

[0048] The test voltage source is a continuously adjustable AC or DC high-voltage power supply. If the live-line working equipment under test is used in an AC live-line environment, an AC high-voltage power supply is used for the test; if the live-line working equipment under test is used in a DC live-line environment, a DC high-voltage power supply is used for the test.

[0049] The simulated conductor is a cylindrical metal rod, with a recommended conductor size of 20mm and a length of not less than 4m. For test voltages higher than 100kV, equalizing rings can be installed at both ends of the conductor to prevent partial discharge. The simulated conductor is fixed on an insulating support, which is made of insulating rods and should conform to standard GB13398-2008 "Hollow Insulating Tubes, Foam-Filled Insulating Tubes and Solid Insulating Rods for Live Working". An insulating pad is installed under the support, which should conform to standard DL / T 853-2015 "Insulating Pads for Live Working".

[0050] The insulating lifting device consists of an insulating platform and a remote control drive. The insulating platform is made of insulating material and is mounted on the remote control drive to support the test sample. It should conform to standard DL / T1465-2015 "Insulating Platform for 10kV Live Working". The remote control drive can control the height of the insulating platform through remote lifting operations, thereby simulating the process of the test sample contacting / detaching from the simulated conductor. The remote control lifting device should be equipped with a monitoring device for the height of the insulating platform, which can monitor the lifting height of the platform. The adjustment accuracy should not exceed 10mm to ensure that the discharge gap distance can be accurately adjusted during the test. To ensure that the equipment's ground capacitance is not too high during the test, resulting in excessive discharge intensity, the height h of the insulating platform above ground during the test should not be less than 2m. The recommended values ​​for the minimum effective insulation distance after the remote control lifting device is raised are shown in Table 1 below.

[0051] Table 1 Minimum Effective Insulation Distance

[0052]

[0053] The specific implementation steps are as follows:

[0054] Step 1: Obtain the equivalent test voltage Us

[0055] Equivalent circuit models were established for both standard test environments and actual operating environments, such as... Figure 3-4 As shown. The equivalent circuit includes three voltage nodes. Node 1 is a high-potential node. Under standard test conditions, the potential U0 of node 1 can be taken as a unit voltage (e.g., 1kV). Under actual working conditions, the potential U1 of node 1 is the maximum operating voltage of the actual working live conductor multiplied by the safety margin (the safety margin can generally be taken as 1-1.2). Node 2 is the intermediate potential node of the live working device during the process of entering and exiting the equipotential state. Node 3 is the 0-potential node, representing the ground.

[0056] When the distance d between the live-line working equipment and the high-voltage live conductor is sufficiently close, potential transfer discharge will occur. The equivalent test method of this invention is to control the equivalent test voltage U. SThis ensures that the peak value of the potential transfer discharge current is consistent between the standard test environment and the actual operating environment, thus resulting in the same interference intensity to the equipment. At a specific discharge distance d, the discharge process is equivalent to a transient process in the circuit, with the discharge time being t. s At the instant before discharge, t = t s- And the instantaneous t=t during discharge s+ The equivalent circuits are shown in the left and right figures, respectively.

[0057] Before discharge, the three nodes have an equivalent distributed capacitance, C. 12 C 23 C 13 These represent the distributed capacitance of the simulated conductor to the test equipment, the distributed capacitance of the test equipment to ground, and the distributed capacitance of the simulated conductor to ground under standard test conditions; C′ 12 C′ 23 C′ 13 These are the distributed capacitances of a live conductor (e.g., a live wire) to the live working equipment, the distributed capacitance of the live working equipment to the ground, and the distributed capacitance of the live conductor to the ground, respectively, under actual working conditions. The values ​​of these distributed capacitances can be obtained through formula calculation, finite element simulation calculation, or actual measurement. The specific method of obtaining these values ​​is not limited in this invention.

[0058] During discharge, an arc breakdown occurs between node 1 and node 2, and the equivalent capacitance C 12 C′ 12 The equivalent arc conductance *g* is transformed into the equivalent arc conductance, while other parts remain unchanged. A fixed value (100-300Ω) is recommended for the equivalent arc conductance. This ensures that the equivalent circuits before and after the discharge process are linear circuits. The calculated response value of the potential transfer current is proportional to the excitation value of the voltage source voltage, allowing for a simple calculation of the equivalent test voltage. Of course, a more complex discharge model can be used to set the arc conductance as a time-varying variable *g(t)*, but this invention does not limit this approach.

[0059] After substituting the relevant parameters into the equivalent circuit, the instantaneous peak current flowing through the arc conductance g under the standard test environment and the actual working environment is calculated, and denoted as I. m 、I′ m The equivalent circuit is a first-order RC transient circuit. The calculation method can be performed using electromagnetic transient simulation software or derived from circuit principles; this invention does not limit the calculation. For cases where the arc conductance g is customized, the equivalent test voltage U can be obtained according to the following formula. S :

[0060]

[0061] For cases where the arc conductance g is a variable g(t), it is necessary to calculate the actual discharge current I in the working environment.m Based on this, the voltage source voltage U0 is adjusted in the standard test environment model to obtain the discharge current value I. m =I m At this point, the voltage source voltage U0 is the equivalent test voltage Us.

[0062] It should be noted that C in the model 12 C′ 12 The parameter is related to the discharge gap distance d, and this value is usually selected as the typical discharge distance for the corresponding voltage level, as shown in Table 2. The discharge distance can also be adjusted according to the actual operating conditions, and this invention does not impose any restrictions.

[0063] Table 2 Typical discharge distances

[0064]

[0065] The simulated conductor uses a metal rod with the same diameter as the actual conductor being tested, reliably fixed to an insulating support with an effective insulation length of not less than L. The robot body and end effector are placed on an insulating lifting platform. The height of the end effector tip relative to the simulated conductor is adjusted by controlling the platform's up-and-down movement via a drive device; the adjustment accuracy should not exceed 3mm. An insulating mat is laid under the insulating support and the insulating lifting platform, and the insulating mat should meet the withstand voltage requirements of the corresponding insulation class. Before the test, the initial position is adjusted so that the distance D between the end effector tip and the simulated conductor is 30mm. During the test, the height of the insulating lifting platform above the ground should not be less than 0.5m.

[0066] Step Two: Experimental Process

[0067] Place the device under test on an insulated platform. Adjust the distance *d* between the working end and the simulated conductor by moving the platform up and down using a drive device. Based on the voltage level of the test equipment, adjust the initial distance *d0* to the discharge distance value corresponding to the equivalent test voltage *Us* calculated in step one. Adjust the test voltage source voltage to the equivalent test voltage *Us*. After the voltage stabilizes, gradually decrease the distance *d* using the drive device, with an adjustment step no greater than one-third of the initial distance *d0*. Hold this position for a certain period after each adjustment (recommended to hold for at least 1 minute) until the tip of the end tool contacts the simulated conductor and remains there for a certain period (recommended to hold for at least 1 minute). Then gradually increase the distance *d* using the same adjustment step, holding this position for a certain period after each adjustment (recommended to hold for at least 1 minute) until the device returns to the initial position. This constitutes one cycle, and the test needs to be performed three times.

[0068] Step 3: Test Evaluation

[0069] During the experiment, interference was applied to the device under test while relevant functional tests were performed. These tests included, but were not limited to, communication functions, image / video transmission functions, and mechanical movement functions. Based on the test results, the potential transfer immunity performance of the device under test was graded and evaluated.

[0070] Grade A: During the test, no component of the equipment experienced functional failure, damage, or malfunction.

[0071] Grade B: During the test, the equipment function is temporarily reduced or lost, but it can recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, without the need for operator intervention.

[0072] Level C: During the test, the equipment function is temporarily reduced or lost, but it cannot recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, and operator intervention or system reset is required.

[0073] Grade D: During the test, damage to equipment (components) or software, or loss of data, results in irreversible loss of function or performance degradation.

[0074] For live-line working environments, equipment with test results reaching Level A is considered to be directly applicable to field operations; equipment with test results reaching Level B should undergo further functional evaluation to ensure that temporary functional reduction or loss during field operations will not affect the operation before it can be used; equipment with Levels C and D cannot be applied to the corresponding live-line working scenarios.

[0075] Example 2: Taking a 10kV voltage level live-line working robot as an example, the specific implementation of the present invention is given:

[0076] Step 1: Obtain the equivalent test voltage Us

[0077] (1) Calculate the distributed capacitance parameters

[0078] This embodiment uses finite element simulation to establish computational models for both standard experimental environments and actual operating environments.

[0079] Standard test environment model: Includes simulated conductors and a robot. The conductor diameter is 20mm, the length is 4m, and the robot's bottom height above the ground is 2m. Actual operating environment model: Includes poles, main conductors, crossarms, and a robot. Pole model: Z1-2 single-circuit straight reinforced concrete pole φ190×15m; crossarm model: angle iron crossarm ∠63×6×2000; conductor diameter: 18mm; conductors are arranged in a triangular pattern; vertical spacing between the middle phase conductor and side conductors is 0.8m; horizontal spacing between conductors is 0.8m; conductor length is 100m; insulator length is 0.5m. Calculations are performed using the robot's end-effector entering the middle phase conductor as an example. For a 10kV system, the discharge distance d is taken as 0.02m.

[0080] Import the model into ANSYS software and calculate the partial capacitance matrix between each conductor. Figure 3-4 The capacitance parameters of the equivalent circuit are shown in the table below.

[0081] Table 3 Calculated values ​​of distributed capacitance

[0082]

[0083] (2) Calculate the potential transfer current

[0084] This embodiment uses electromagnetic transient simulation to calculate the potential transfer current, according to... Figure 3-4 The equivalent circuit is used to establish an EMTP electromagnetic transient calculation model, such as Figure 5 As shown. The transient process is triggered by a timer switch. The arc conductance g is set to 100Ω. The arc discharge occurs at the calculated peak phase voltage at the discharge time t0 = 0.5s. Switch K1 is closed, and switch K2 is delayed and opened at the zero-crossing point of the branch capacitor voltage (discharge completed).

[0085] Under the equivalent test environment distributed capacitance parameters, with the voltage U0 of node 1 (AC voltage source) set to 1kV (peak value), the peak value of the potential transfer current I is obtained. m =12.1A, such as Figure 6 As shown.

[0086] Under the actual operating environment and distributed capacitance parameters, the maximum operating phase voltage of the 10kV system is taken as 11.5kV, and the voltage at node 1 is set as the phase voltage. The peak value of the potential transfer current I′ is obtained. m =57.2A, such as Figure 7 As shown.

[0087] Substituting the calculation results into formula (1), the test voltage U under the equivalent test environment is obtained. S =4.7kV, the corresponding potential transfer current is as follows Figure 8 As shown.

[0088] Step Two: Experimental Process

[0089] Place the device under test on an insulated platform. Adjust the distance d between the working end and the simulated conductor by moving the platform up and down using a drive device. For a 10kV voltage level, adjust the initial distance to 2cm. Adjust the test voltage source to 4.7kV. After the voltage stabilizes, gradually decrease the distance d by controlling the drive device, adjusting in 5mm increments, holding for 1 minute after each adjustment, until the tip of the end tool contacts the simulated conductor and holds for 1 minute. Then gradually increase the distance d by controlling the drive device, adjusting in 5mm increments, holding for 1 minute after each adjustment, until it returns to the initial position. This constitutes one cycle, and the test needs to be repeated 3 times.

[0090] Step 3: Test Evaluation

[0091] During the experiment, interference was applied to the device under test while relevant functional tests were performed. These tests included, but were not limited to, communication functions, image / video transmission functions, and mechanical movement functions. Based on the test results, the potential transfer immunity performance of the device under test was graded and evaluated.

[0092] Grade A: During the test, no component of the equipment experienced functional failure, damage, or malfunction.

[0093] Grade B: During the test, the equipment function is temporarily reduced or lost, but it can recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, without the need for operator intervention.

[0094] Level C: During the test, the equipment function is temporarily reduced or lost, but it cannot recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, and operator intervention or system reset is required.

[0095] Grade D: During the test, damage to equipment (components) or software, or loss of data, results in irreversible loss of function or performance degradation.

[0096] Secondly, a method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment includes...

[0097] Method for obtaining equivalent test voltage: Establish an equivalent circuit model of the potential transfer process, calculate the distributed capacitance parameters of the equivalent circuit under the same discharge distance in the actual working environment and the standard test environment, obtain the peak value of the potential transfer current under the actual working environment voltage and the potential transfer current value of the equivalent test environment under the standard voltage, and convert them to obtain the equivalent test voltage that produces the same potential transfer current.

[0098] Test evaluation method: While applying interference to the device under test, relevant functional tests are performed on the device. The test content includes, but is not limited to: communication function, image / video transmission function, and mechanism action function. Based on the test results of these functions, the potential transfer anti-interference performance of the device under test is graded and evaluated.

[0099] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0100] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment, comprising the following: Step 1: Set up a standard experimental environment in the laboratory that can perform equivalent tests of potential transfer, and establish an equivalent circuit model of the potential transfer process; in, The standard test environment includes a test voltage source, simulated conductors, an insulating support, an insulating lifting device, and an insulating pad; the equivalent circuit model includes a voltage source, a first distributed capacitance C12 between the simulated conductors and the device under test, a second distributed capacitance C23 between the device under test and ground, a third distributed capacitance C13 between the simulated conductors and ground, and an arc resistance g used to simulate the discharge process. Step 2: Obtain the distributed capacitance parameters of the equivalent circuit under the actual working environment and the standard test environment under the same discharge distance, obtain the peak value of the potential transfer current under the actual working environment voltage and the potential transfer current value of the equivalent test environment under the standard voltage, and calculate the equivalent test voltage that produces the same potential transfer current. Step 3: Perform equivalent functional tests on the potential transfer interference processes of various actual live-line working environments under the standard laboratory test environment, and evaluate the potential transfer anti-interference performance in a graded manner.

2. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 1, characterized in that, The standard test environment described in step 1 includes a test voltage source, simulated conductors, insulating supports, insulating lifting devices, and insulating mats. The test voltage source is a continuously adjustable AC high-voltage power supply or a DC high-voltage power supply. The insulating support is disposed between the simulated wire and the insulating pad. The insulating support is made of an insulating rod. The simulated wire is a cylindrical metal rod with a diameter of 20mm and a length of not less than 4m. The insulating lifting device includes an insulating platform and a remote control drive device. The insulating platform is made of insulating material and is installed and fixed on the remote control drive device to support the test sample. The remote control drive device is set on the insulating pad and controls the height of the insulating platform through remote lifting operation to simulate the process of the test sample contacting or detaching from the simulated wire. The insulating lifting device also includes a monitoring device for monitoring the lifting height of the insulating platform. The height of the insulating platform above the ground is not less than 2m, and the adjustment accuracy is not greater than 10mm, to ensure precise adjustment of the discharge gap distance.

3. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 1, characterized in that, The equivalent circuit model includes a voltage source and a distributed capacitance C. 12 Distributed capacitance C 23 Distributed capacitance C 13 Arc resistance g and discharge switch, The distributed capacitance C 12 Discharge switch, distributed capacitance C 23 In series with the distributed capacitance C 13 Connected in parallel with the voltage source, during discharge, the equivalent distributed capacitance C 12 It becomes the equivalent arc resistance g.

4. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 3, characterized in that, The values ​​of each distributed capacitance were determined using the finite element method, with ANSYS software assisting in the calculation.

5. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 1, characterized in that, The formula for obtaining the equivalent voltage Us in step 2 is: in, U 0 For the high-potential node voltage, I m I´ represents the peak instantaneous current flowing through the arc resistance g under standard test conditions. m This represents the peak instantaneous current flowing through the arc resistance g under actual operating conditions.

6. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 1, characterized in that, The criteria for graded evaluation in step 3 are as follows: Grade A: During the test, no component of the equipment experienced functional failure, damage, or malfunction. Grade B: During the test, the equipment function is temporarily reduced or lost, but it can recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, without the need for operator intervention. Level C: During the test, the equipment function is temporarily reduced or lost, but it cannot recover on its own after the power supply voltage is reduced or the test power is turned off, i.e. the interference is weakened or stopped, and operator intervention or system reset is required. Grade D: During the test, damage to equipment or software, or loss of data, results in irreversible loss of function or performance degradation. For live-line working environments, equipment with test results reaching Level A can be directly applied to on-site operations; equipment with test results reaching Level B requires further functional evaluation to ensure that temporary functional reduction or loss during on-site operations does not affect the operation before it is used; equipment with Levels C and D cannot be applied to the corresponding live-line working scenarios.

7. The method for evaluating the anti-interference capability of arc discharge in automated live-line working equipment according to claim 1, characterized in that, The specific test procedure for simulating various actual live-line working environments under standard laboratory test conditions, as described in step 3, is as follows: The distance between the device end and the simulated conductor is adjusted by moving the control platform up and down with a drive device. This distance is the typical discharge distance d under the corresponding voltage. The device end is moved closer to the simulated conductor in a fixed step size less than d until it contacts the conductor. Then, the device end moves away from the simulated conductor in the same fixed step size until it returns to the initial position.

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