Critical electric field-based offshore wind power valve hall air gap determination method and system

Abstract

The invention discloses an offshore wind power valve hall air gap determination method and system based on a critical electric field, and relates to the technical field of gap discharge process analog simulation. Comprising the following steps: step a, acquiring initial clearance distances among equipment in a valve hall; b, obtaining the critical electric field intensity of air gap breakdown in the valve hall; c, electric field distribution conditions of all positions of the valve hall are obtained; d, determining a critical electric field intensity reference value for correcting the initial gap distance in the step a; and e, determining a critical electric field intensity judgment interval, and judging whether the electric field intensity under the current equipment clearance distance in the valve hall meets the electric field intensity judgment interval or not. According to the method and system for determining the air gap of the offshore wind power valve hall based on the critical electric field, the gap distance obtained through a traditional means is corrected through the critical electric field, the result is more accurate, the design size and weight of the valve hall are further reduced, higher universality is achieved, and miniaturization and light weight of the design of the valve hall are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of gap discharge process simulation and in particular to a method and system for determining an air gap in an offshore wind power valve hall based on a critical electric field. Background Art

[0002] Offshore wind power transmission requires DC transmission technology, and the valve hall is an important part of DC transmission. For offshore wind power, the valve hall is lightweight and miniaturized for practical engineering applications, so the design of the space gap at each position inside the valve hall becomes particularly important. The weight and volume of the valve hall are closely related to the air clearance between the various devices in the valve hall. Especially for offshore wind power transmission, choosing a suitable valve hall air gap can greatly simplify the valve hall space size and weight, which is beneficial to practical engineering applications.

[0003] In the prior art, the design of air gap distance in offshore wind power valve hall is mostly completed by g parameter method, such as the document entitled "g parameter correction method for design of air clearance distance in valve hall of ±800kv converter station in western Zhejiang" published on September 30, 2011; and the document entitled "calculation method of air clearance distance and altitude correction on DC side of converter station" published in 2009. The problem of designing air gap distance in valve hall by g parameter method is that it does not consider the influence of space size of each equipment in valve hall, so the result obtained by g parameter algorithm calculation only does not refer to the layout in valve hall, which results in the decrease of calculation accuracy of air gap in valve hall.

[0004] The Chinese invention patent with the publication number CN102818959A and the patent name "Calculation method of minimum air clearance of DC valve hall based on improved clearance coefficient" also discloses a technical solution, in which the technical solution adopted is: propose multiple clearance models (such as needle-plate model, plate-plate model, needle-ball model), simulate various equipment in the valve hall with corresponding models, and then propose clearance coefficients corresponding to various models, and use the coefficients to reflect the different structural parameter characteristics of the equipment. However, in the actual valve hall, the appearance of various equipment is different, so the adaptability of the method of constructing a clearance model and using the clearance coefficient to calculate the air clearance is limited.

[0005] Therefore, designing an air gap that actually considers the internal structure of the valve hall and the characteristics of each device in order to achieve a technical solution for the air gap correction design has become an urgent problem to be solved in this field. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a method and system for determining the air gap in an offshore wind power valve hall using a critical electric field, which realizes the correction of the gap distance obtained by traditional means using the critical electric field, makes the result more accurate, further reduces the design size and weight of the valve hall, has stronger universality, and promotes the miniaturization of the valve hall design and lightweight critical electric field.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the method for determining the air gap of the offshore wind power valve hall based on the critical electric field is characterized by comprising the following steps: Step a, obtaining the initial gap distance between the devices in the valve hall; Step b, performing an operation impact test on the valve hall according to the initial gap distance between the devices in the valve hall in step a, and obtaining a critical electric field strength for breakdown of the air gap in the valve hall; Step c, simulating the initial gap distance between the devices in the valve hall in step a to obtain the electric field distribution at each position in the valve hall; Step d, determining a critical electric field strength reference value for correcting the initial gap distance in step a; Step e, determine the critical electric field strength judgment interval, and judge whether the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval. If it does, the current gap distance of each device is the final value, otherwise adjust the gap distance between each device in the valve hall so that the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval.

[0008] In step a, the g parameter method is used to obtain the preliminary design of the valve hall, which includes the gap distance between the devices in the valve hall and the operating impulse voltage corresponding to the gap distance between the devices. U 50 .

[0009] The step b comprises the following steps: Step b-1, obtaining experimental parameters of the operation impact test; Step b-2, based on the experimental parameters obtained in step b1, conduct an operation impact test with different gap distances and environmental factors to obtain the operation impact voltage of different needle plate air gaps under different environmental factors U 50 ; Step b-3, according to the actual size and material of the needle plate electrode in the operation impact test in step b-2, a needle plate electrode simulation analysis model is established, and the obtained operation impact voltage is converted into U 50 , as well as different environmental parameters, are used as the input of the needle-plate electrode model to obtain the electric field intensity distribution of different needle-plate air gap distances under different environmental conditions.

[0010] The step b-1 comprises the following steps: Step b-1-1, according to the initial gap distance between each device obtained in step a, the maximum value of the initial gap distance is rounded up to obtain the maximum air gap of the operation impact test d max , round down the minimum value of the initial gap distance to obtain the minimum air gap for the operation shock test d min ; Step b-1-2, determining the actual gap distance point values ​​to be tested during the operation impact test; Step b-1-3, determine the environmental parameter step size for subsequent impact tests, the environmental parameter step size includes temperature interval and humidity interval.

[0011] In the step b-1-2, let As the step size of the time interval adjustment for the operation shock test: =( d max - d min )× m , m represents the experimental step adjustment coefficient, m The value ranges from 10% to 60%.

[0012] The step c comprises the following steps: Step c-1, three-dimensional modeling of the valve hall and its internal equipment to obtain a simulation analysis model of the valve hall; Step c-2: convert the operating impulse voltage obtained in step a U 50 The valve hall simulation analysis model established in step 301 is input as the initial voltage, and the electrostatic field calculation model is used for simulation to obtain the electric field distribution at each position of the valve hall.

[0013] The step d comprises the following steps: Step d-1, defining the spacing selection range according to the actual spacing of each device in the valve hall.

[0014] Step d-2, based on the spacing selection range determined in step d-1 and the gap distance point values ​​determined in step b-1-2, select the gap distance point value that falls within the spacing selection range as the gap distance reference point.

[0015] Step d-3, taking the critical electric field strength corresponding to the gap distance reference point selected in step d-2 as the critical electric field strength reference value; if there are multiple gap distance point values ​​in the spacing selection range, taking the average of the critical electric field strengths corresponding to all gap distance point values ​​as the critical electric field strength reference value.

[0016] The critical electric field strength determination interval is 70% to 100% of the critical electric field strength reference value.

[0017] An offshore wind power valve hall air gap determination system based on critical electric field is characterized by: An initial setting unit is used to obtain the initial clearance distance between the devices in the valve hall; An impact test unit, whose input end is connected to the output end of the initial setting unit, is used to perform an operation impact test on the valve hall to obtain a critical electric field strength for breakdown of the air gap in the valve hall; A simulation unit, whose input end is connected to the output end of the initial setting unit, simulates and obtains the electric field distribution at each position of the valve hall; A calculation unit, used for calculating a critical electric field strength reference value and determining a critical electric field strength determination interval; The logic judgment unit, whose input end is connected to the output end of the calculation unit, is used to judge whether the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval.

[0018] The impact test unit includes: A parameter determination module, used to obtain experimental parameters of the operation impact test; An experiment execution module, whose input terminal is connected to the output terminal of the parameter determination module, is used to perform an operation impact experiment according to the experiment parameters; The simulation analysis module, whose input end is connected to the output end of the experiment execution module, is used to obtain the electric field intensity distribution of different needle plate air gap distances under different environmental conditions according to the operation impact experiment.

[0019] Compared with the prior art, the present invention has the following beneficial effects: Through the method and system for determining the air gap of the offshore wind power valve hall of the critical electric field, and using the critical electric field, the gap distance obtained by traditional means is corrected, making the result more accurate, further reducing the design size and weight of the valve hall, having stronger universality, and promoting the miniaturization and lightweight of the valve hall design.

[0020] The method and system for determining the air gap in the offshore wind power valve hall of the critical electric field takes into account the structural parameters of each device in the valve hall when selecting the air gap distance in the valve hall, which can effectively reduce the difficulty of offshore valve hall engineering construction and application.

[0021] The method and system for determining the air gap in the offshore wind turbine valve hall of the critical electric field directly establishes a geometric structure model of each device, and then performs simulation analysis on the model. Compared with the prior art, the present application uses the electric field distribution between gaps as the basis for judgment, which is more in line with the actual situation of the ever-changing appearance of on-site equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A flow chart of the method for determining the air gap of the offshore wind turbine valve hall based on the critical electric field; Figure 2 Flow chart for obtaining the critical electric field strength for breakdown of the air gap in the valve hall; Figure 3 A flow chart to obtain the electric field distribution at each position of the valve hall; Figure 4 Flow chart for determining the critical electric field strength reference value for gap distance correction. DETAILED DESCRIPTION

[0023] Figures 1 to 4 The best embodiment of the present invention is shown below in conjunction with the attached Figures 1 to 4 The present invention is further described.

[0024] like Figure 1 As shown, the method for determining the air gap of an offshore wind power valve hall based on a critical electric field comprises the following steps: Step S1, preliminary design of valve hall; The preliminary design of the valve hall is obtained by using the g parameter method according to the environmental parameters of the valve hall project. The preliminary design of the valve hall includes the gap distance between the equipment in the valve hall and the operating impulse voltage corresponding to the gap distance between the equipment. U 50 , switching impulse voltage U 50 It refers to the voltage value when a certain air gap has a 50% probability of being broken down. The gap distance between each device designed by the g parameter method is the initial gap distance between each device in the valve hall.

[0025] Step S2, obtaining the critical electric field strength for breakdown of the air gap in the valve hall; like Figure 2 As shown, step S2 includes the following steps: Step S201, obtaining experimental parameters of the operation impact test; According to the gap distance between the devices obtained in step 1 (that is, the initial gap distance, recorded as d ), the gap distance d The maximum value of the air gap is rounded up to obtain the maximum air gap in the subsequent experiments. d max , the gap distanced The minimum value of is rounded down to obtain the minimum air gap for subsequent experiments d min , maximum air gap d max and minimum air gap d min This is the test range for the subsequent in-and-out operation impact test. Therefore, when conducting the operation impact test, the test range includes all the gap distances between the devices.

[0026] And order =( d max - d min )× m , will be used as the step size for adjusting the time interval of subsequent operational shock experiments, where m represents the experimental step adjustment coefficient, m The value of is 10%~60%. This is used to determine the actual gap distance point values ​​to be tested in the subsequent operation impact test.

[0027] At the same time, determine the environmental parameter step size for subsequent impact tests, including the temperature, humidity and air pressure of the valve hall project. Environmental parameter step sizes include temperature intervals and humidity intervals.

[0028] Step S202, an operation impact test of different needle plate gaps under valve hall environmental parameter conditions; According to the environmental parameters of the valve hall project, the needle plate electrode is selected in the artificial climate room, and the gap change range and step length and environmental parameter step length selected in step S201 are referred to. The operation impact experiment with different gap distances and environmental factors is carried out to obtain the operation impact voltage of different needle plate air gaps under different environmental factors. U 50 .

[0029] Step S203, obtaining the field intensity distribution of different needle plate air gap distances under different environmental conditions; In the finite element analysis software (such as the built-in electrostatic field simulation model of ANSYS or COMSOL), a needle plate electrode simulation analysis model is established according to the actual size and material of the needle plate electrode for the operation impact experiment in step 202, and the operation impact voltage obtained in step S202 is converted into the electrostatic field simulation calculation module provided by the finite element analysis software. U 50 , as well as different environmental parameters, are used as the input of the needle-plate electrode model to obtain the electric field intensity distribution of different needle-plate air gap distances under different environmental conditions.

[0030] Step S204, obtaining the critical electric field strength for air gap breakdown; According to the field intensity distribution of different needle plate air gap distances under different environmental conditions obtained in step 203, among all the needle plate gap distances for the operation impact test, 0.8 times the maximum value of the electric field intensity under all environmental conditions when the corresponding needle plate gap distance is selected is used as the critical electric field intensity for breakdown of the needle plate gap distance. E c .

[0031] Step S3, obtaining the electric field distribution at each position of the valve hall; like Figure 3 As shown, step S3 includes the following steps: Step S301, establishing a valve hall simulation analysis model; A three-dimensional model of the valve hall and its internal equipment, namely, a valve hall simulation analysis model, is established using known software.

[0032] Step S302, obtaining the electric field distribution at each position of the valve hall; The switching impulse voltage obtained in step 1 U 50 The valve hall simulation analysis model established in step 301 is input as the initial voltage, and the simulation analysis is completed through the electrostatic field calculation model built into the software to obtain the electric field distribution at each position of the valve hall.

[0033] Therefore, in this method for determining the air gap of the offshore wind power valve hall based on the critical electric field, the mathematical calculation model of the electric field simulation analysis model is existing and recognized, while the physical model (i.e., the whole composed of the valve hall shape and the internal equipment shape and the distance between each device) varies with the different valve halls.

[0034] Step S4, determining a critical electric field strength reference value for gap distance correction; The initial gap distance between the devices in the valve hall determined by the g parameter method in step 1 is corrected by the critical electric field strength. First, the reference value of the corrected critical electric field strength is calculated, such as Figure 4 As shown, the determination steps are: Step S401, according to the actual spacing between the devices in the valve hall, 85% to 100% of the actual spacing between the devices is used as the spacing selection range.

[0035] Step S402, according to the spacing selection range determined in step S401 and the gap distance point values ​​determined in step 201, a gap distance point value falling within the spacing selection range is selected as a gap distance reference point.

[0036] Step S403, taking the critical electric field strength corresponding to the gap distance reference point selected in step S402 as the critical electric field strength reference value; if there are multiple gap distance point values ​​in the spacing selection range, taking the average of the critical electric field strengths corresponding to all gap distance point values ​​as the critical electric field strength reference value.

[0037] Step S5, using 70%~100% of the critical electric field strength reference value determined in step S4 as the critical electric field strength determination interval, judge whether the electric field strength at the current gap distance of each device in the valve hall meets the critical electric field strength determination interval; if the electric field strength at the current gap distance of each device in the valve hall meets the critical electric field strength determination interval, execute step S6; if the electric field strength at the current gap distance of each device in the valve hall does not meet the critical electric field strength determination interval, execute step S7.

[0038] Step S6: The current air gap distance between the devices in the valve hall is the final value.

[0039] Step S7, adjusting the gap distance or device structure parameters between the devices in the valve hall, and returning to step 301 in step 3 until the critical electric field strength determination interval in step S5 is met.

[0040] For ease of understanding, the following is a further explanation of the above-mentioned method for determining the air gap of an offshore wind turbine valve hall based on the critical electric field, taking an offshore valve hall (ambient temperature 5°C~45°C, humidity 10%~60%), two spherical low-voltage electrodes, and the gap distance selection between a spherical low-voltage electrode and the ground as an example: Corresponding to step S1: First, according to the environmental parameters, the g parameter method is used to obtain the distance between the two spherical low-voltage electrodes as 942 mm and the operating impulse voltage as U 50 The spherical electrode is made of copper and has a diameter of 20 mm. The distance between the low-voltage electrode and the ground of the other team is 526 mm. U 50 The voltage is 195kV, the spherical electrode is made of copper and has a diameter of 25mm.

[0041] Corresponding to step 201: taking the distance 526 mm as the reference and rounding down to obtain the minimum clearance value of the subsequent operation impact test is 520 mm, taking the distance 942 mm as the reference and rounding down to obtain the minimum clearance value of the subsequent operation impact test is 950 mm. mThe gap increment during the 10% experiment is taken as 43 mm, that is, the actual gap distance point values ​​in the subsequent operational impact test are: 520 mm, 563 mm, 606 mm, 649 mm, 692 mm, 735 mm, 778 mm, 821 mm, 864 mm, 907 mm, and 950 mm.

[0042] And determine the temperature step size to be 5°C and the humidity step size to be 10%.

[0043] Corresponding to step 202: the pressure in the artificial climate chamber is controlled to be 101 kPa ± 10%, a φ20 mm × 1 m copper rod and a 4 m × 4 m × 2 mm copper plate are selected as the needle electrode and the plate electrode, respectively, and the operation impact experiments are carried out at each needle-plate air gap distance of 520 mm, 563 mm, 606 mm, 649 mm, 692 mm, 735 mm, 778 mm, 821 mm, 864 mm, 907 mm, 950 mm, etc., respectively, with the gap distance point value, temperature step length and humidity step length determined as above, to obtain the operation impact voltage of each needle-plate gap at an ambient temperature of 5°C to 45°C and a humidity of 10% to 60%. U 50 Voltage value.

[0044] Corresponding to step 203: establish a needle-plate electrode model in the finite element analysis software Comsol, and measure the operating impulse voltage at the ambient temperature of 5℃~45℃ and humidity of 10%~60% with the needle-plate gap distance of 520mm, 563mm, 606mm, 649mm, 692mm, 735mm, 778mm, 821mm, 864mm, 907mm and 950mm respectively. U 50 The input voltage of the rod electrode is used as the input, and the ambient temperature of 5℃~45℃ and the humidity of 10%~60% are input at the same time. The electric field distribution of each gap is obtained through simulation analysis.

[0045] Corresponding to step 204: 0.8 times of the maximum electric field strength of each gap under all environmental conditions is taken as the critical breakdown field strength at the gap distance.

[0046] Corresponding to step 301: two copper spherical electrodes with a diameter of 20 mm, a copper spherical electrode with a diameter of 25 mm and a ground electrode are also established in the finite element analysis software Comsol.

[0047] Corresponding to step 302: the simulation analysis obtains that the field intensity between the two spherical electrodes is distributed in the range of 0.12-0.35 kV / mm; the field intensity between the other spherical electrode and the ground is distributed in the range of 0.08-0.23 kV / mm.

[0048] Corresponding to step 4: According to the 85%~100% spacing selection range of the spacing between the two spherical low-voltage electrodes (942mm) obtained above: 800~942, the average value of the critical breakdown field strength under the three gaps of 921, 864mm and 950mm is selected as the reference value of the critical electric field strength: E c =1.05 kV / mm.

[0049] Similarly, according to the 85%~100% spacing selection range of the spacing between the spherical low-voltage electrode and the ground (526mm) obtained above: 447~526, the critical breakdown field strength under the 520mm gap is selected as the reference value of the critical electric field strength: E c =0.65kV / mm.

[0050] Corresponding to steps 5~7: Adjust the diameter of the spherical electrode and the distance between the two spherical electrodes. When the diameter of the spherical electrode is 22.5 mm and the distance between the two is 782 mm, the electric field strength between the two is between 0.735 kV / mm and 1.05 kV / mm. Therefore, 782 mm is the gap distance between the spherical low-voltage electrodes of the offshore valve hall. Similarly, the diameter of another spherical electrode and the distance between it and the ground electrode are adjusted. When the diameter of the spherical electrode is 27.2 mm and the distance between the two is 456 mm, the electric field strength between the two is between 0.455 kV / mm and 0.65 kV / mm. Therefore, 456 mm is the gap distance between the spherical low-voltage electrode of the offshore valve hall and the ground.

[0051] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A method for determining air gap in an offshore wind turbine valve hall based on a critical electric field, characterized in that: The steps include: Step a, obtaining the initial gap distance between the devices in the valve hall; Step b, performing an operation impact test on the valve hall according to the initial gap distance between the devices in the valve hall in step a, and obtaining a critical electric field strength for breakdown of the air gap in the valve hall; Step c, simulating the initial gap distance between the devices in the valve hall in step a to obtain the electric field distribution at each position in the valve hall; Step d, determining a critical electric field strength reference value for correcting the initial gap distance in step a; Step e, determine the critical electric field strength judgment interval, and judge whether the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval. If it does, the current gap distance of each device is the final value, otherwise adjust the gap distance between each device in the valve hall so that the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval.

2. The method for determining air gap of offshore wind power valve hall based on critical electric field according to claim 1 is characterized in that: In step a, the g parameter method is used to obtain the preliminary design of the valve hall, which includes the gap distance between the devices in the valve hall and the operating impulse voltage corresponding to the gap distance between the devices. U 50 .

3. The method for determining air gap of offshore wind power valve hall based on critical electric field according to claim 1 is characterized in that: The step b comprises the following steps: Step b-1, obtaining experimental parameters of the operation impact test; Step b-2, based on the experimental parameters obtained in step b1, conduct an operation impact test with different gap distances and environmental factors to obtain the operation impact voltage of different needle plate air gaps under different environmental factors U 50 ; Step b-3, according to the actual size and material of the needle plate electrode in the operation impact test in step b-2, a needle plate electrode simulation analysis model is established, and the obtained operation impact voltage is converted into U 50 , as well as different environmental parameters, are used as the input of the needle-plate electrode model to obtain the electric field intensity distribution of different needle-plate air gap distances under different environmental conditions.

4. The method for determining air gap of offshore wind power valve hall based on critical electric field according to claim 3 is characterized in that: The step b-1 comprises the following steps: Step b-1-1, according to the initial gap distance between each device obtained in step a, the maximum value of the initial gap distance is rounded up to obtain the maximum air gap of the operation impact test d max , round down the minimum value of the initial gap distance to obtain the minimum air gap for the operation shock test d min ; Step b-1-2, determining the actual gap distance point values ​​to be tested during the operation impact test; Step b-1-3, determine the environmental parameter step size for subsequent impact tests, the environmental parameter step size includes temperature interval and humidity interval.

5. The method for determining air gap of offshore wind turbine valve hall based on critical electric field according to claim 4 is characterized in that: In the step b-1-2, As the step size of the time interval adjustment for the operation shock test: =( d max - d min )× m , m represents the experimental step adjustment coefficient, m The value ranges from 10% to 60%.

6. The method for determining air gap of offshore wind power valve hall based on critical electric field according to claim 2 is characterized in that: The step c comprises the following steps: Step c-1, three-dimensional modeling of the valve hall and its internal equipment to obtain a simulation analysis model of the valve hall; Step c-2: convert the operating impulse voltage obtained in step a U 50 The valve hall simulation analysis model established in step 301 is input as the initial voltage, and the electrostatic field calculation model is used for simulation to obtain the electric field distribution at each position of the valve hall.

7. The method for determining air gap of offshore wind power valve hall based on critical electric field according to claim 4 is characterized in that: The step d comprises the following steps: Step d-1, defining the spacing selection range according to the actual spacing of each device in the valve hall; Step d-2, according to the spacing selection range determined in step d-1 and the gap distance point values ​​determined in step b-1-2, selecting a gap distance point value that falls within the spacing selection range as a gap distance reference point; Step d-3, taking the critical electric field strength corresponding to the gap distance reference point selected in step d-2 as the critical electric field strength reference value; if there are multiple gap distance point values ​​in the spacing selection range, taking the average of the critical electric field strengths corresponding to all gap distance point values ​​as the critical electric field strength reference value.

8. The method for determining air gap in an offshore wind turbine valve hall based on critical electric field according to claim 1 or 7, characterized in that: The critical electric field strength determination interval is 70% to 100% of the critical electric field strength reference value.

9. A system for implementing the method for determining air gap in an offshore wind power valve hall based on a critical electric field according to any one of claims 1 to 8, characterized in that: include: An initial setting unit is used to obtain the initial clearance distance between the devices in the valve hall; An impact test unit, whose input end is connected to the output end of the initial setting unit, is used to perform an operation impact test on the valve hall to obtain a critical electric field strength for breakdown of the air gap in the valve hall; A simulation unit, whose input end is connected to the output end of the initial setting unit, simulates and obtains the electric field distribution at each position of the valve hall; A calculation unit, used for calculating a critical electric field strength reference value and determining a critical electric field strength determination interval; The logic judgment unit, whose input end is connected to the output end of the calculation unit, is used to judge whether the electric field strength at the current gap distance of each device in the valve hall meets the electric field strength judgment interval.

10. The system according to claim 9, characterized in that: The impact test unit includes: A parameter determination module, used to obtain experimental parameters of the operation impact test; An experiment execution module, whose input terminal is connected to the output terminal of the parameter determination module, is used to perform an operation impact experiment according to the experiment parameters; The simulation analysis module, whose input end is connected to the output end of the experiment execution module, is used to obtain the electric field intensity distribution of different needle plate air gap distances under different environmental conditions according to the operation impact experiment.

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