Component optimization method of air-insulated switch cabinet and air-insulated switch cabinet

Abstract

The invention discloses a component optimization method of an air-insulated switch cabinet and the air-insulated switch cabinet, and relates to the technical field of air-insulated switch cabinet optimizing.According to the component optimization method of the air-insulated switch cabinet, structural parameters of a cabinet penetrating sleeve used by an existing air-insulated switch cabinet are optimized in a simulation calculation mode, and the structural parameters of the cabinet penetrating sleeve are optimized; a five-prevention padlock device, a valve mechanism, a fan, a heater, a temperature and humidity controller, an electromagnetic lock, an LED lamp and a padlock hole are arranged for an existing air insulation switch cabinet, safe operation of the air insulation switch cabinet can be guaranteed to the maximum extent, and then safe and stable operation of a power grid is guaranteed. The air-insulated switch cabinets produced by different manufacturers can be universally and interchangeably used within a certain range and a certain period at the same time, and the operation and maintenance convenience of the air-insulated switch cabinets is improved.

Description

Technical Field

[0001] The invention relates to the technical field of air-insulated switch cabinet optimization, and in particular to a component optimization method of an air-insulated switch cabinet and an air-insulated switch cabinet. Background Art

[0002] As a metal-enclosed switching power equipment, switchgear is widely used in power grids and has a wide impact. Its performance is of great significance to ensuring the reliability of power supply. The existing high-voltage switchgear has defects in structural design and electrical layout, and the manufacturing process also has many imperfections. It is easily affected by the environment and other factors during the installation and operation and maintenance stages. In actual operation, many safety issues are exposed, which seriously affects the safe and stable operation of the power grid. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and specifically provide a component optimization method for an air-insulated switchgear and an air-insulated switchgear, as follows:

[0004] 1) In the first aspect, the present invention provides a component optimization method for an air-insulated switchgear, and the specific technical solution is as follows:

[0005] Simulate the double-shielded bushing used in air-insulated switchgear.

[0006] According to the simulation calculation results, the structural parameters of the cabinet bushing are optimized.

[0007] On the basis of the above scheme, the component optimization method of an air-insulated switch cabinet of the present invention can also be improved as follows.

[0008] Furthermore, it also includes:

[0009] A five-protection padlock device is respectively provided at the grounding switch operation hole and the circuit breaker push operation hole of the air-insulated switchgear.

[0010] Furthermore, it also includes:

[0011] A valve mechanism is provided on the air-insulated switch cabinet. When the trolley of the air-insulated switch cabinet is moved from the working position to the test position or the isolation position, the valve mechanism is automatically closed and locked; when the trolley is pushed into the air-insulated switch cabinet, the valve mechanism is opened.

[0012] Furthermore, it also includes:

[0013] The air-insulated switchgear is equipped with a fan, and a protective net is provided at the air inlet of the fan.

[0014] Furthermore, it also includes:

[0015] The air-insulated switchgear is equipped with a heater and a dehumidifier. The temperature and humidity controller starts and stops the heater according to the corresponding start and stop conditions of the heater, and the temperature and humidity controller starts and stops the dehumidifier according to the corresponding start and stop conditions of the dehumidifier.

[0016] Furthermore, it also includes:

[0017] An electromagnetic lock is installed on the air-insulated switchgear.

[0018] Furthermore, it also includes:

[0019] LED lights are provided for the instrument room and cable room of the air-insulated switchgear.

[0020] Furthermore, it also includes:

[0021] A padlock hole is reserved on the door of the air-insulated switch cabinet, and the hole diameter of the padlock hole shall not be less than 8.5mm.

[0022] Furthermore, the air-insulated switchgear is a 40.5 kV air-insulated switchgear, and the cabinet depth of the 40.5 kV air-insulated switchgear is 2800 mm or 3100 mm.

[0023] 2) In a second aspect, the present invention further provides an optimized air-insulated switchgear obtained by any of the above-mentioned air-insulated switchgear component optimization methods.

[0024] The beneficial effects of the present invention are as follows:

[0025] Through simulation calculation, the structural parameters of the bushing used in the existing air-insulated switchgear are optimized, and the existing air-insulated switchgear is equipped with a five-protection padlocking device, a valve mechanism, a fan, a heater, a temperature and humidity controller, an electromagnetic lock, an LED light and a padlock hole, which can ensure the safe operation of the air-insulated switchgear to the greatest extent, thereby ensuring the safe and stable operation of the power grid. Moreover, it can also meet the universal interchangeable use of air-insulated switchgear produced by different manufacturers within a certain range and a certain period, thereby improving the operation and maintenance convenience of the air-insulated switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments of the present invention:

[0027] Figure 1 A schematic flow chart of a component optimization method for an air-insulated switchgear according to an embodiment of the present invention;

[0028] Figure 2 It is a 3D simulation model of the bushing of 40.5kV air-insulated switchgear;

[0029] Figure 3 A schematic diagram of a simplified model of a cabinet bushing. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0032] like Figure 1 As shown, a component optimization method of an air-insulated switchgear according to an embodiment of the present invention comprises the following steps:

[0033] S1. Simulate and calculate the bushing with double shielding structure used in air-insulated switchgear;

[0034] S2. According to the simulation calculation results, the structural parameters of the cabinet bushing are optimized.

[0035] Among them, the air-insulated switchgear is a 40.5kV air-insulated switchgear, and the cabinet depth of the 40.5kV air-insulated switchgear is 2800mm or 3100mm.

[0036] Among them, the height of the cabinet bushing with double shielding structure is 450mm and the diameter is 240mm. The double shielding structure specifically includes: high-voltage shielding net and grounding shielding net. Both high-voltage shielding net and grounding shielding net are cylindrical structures, and the high-voltage shielding net and grounding shielding net are concentrically arranged, with a cross-sectional area of ​​4mm 2 The soft copper stranded wire connects the high-voltage shielding net and the high-voltage busbar. The outer layer of the copper stranded wire is covered with 2mm thick silicone rubber. The soft copper stranded wire and the high-voltage shielding, as well as the soft copper stranded wire and the high-voltage busbar are fastened with M5 bolts. The bolts and equipotential wires must be placed in the high-voltage shielding net of the cabinet bushing (the fixing bolts are preferably 40mm in the bushing). The M5 bolts use semicircular heads. The height of the bolts fixed to the copper bar shall not exceed 3mm. The copper stranded wire is flush with the copper bar and shall not contact the inner wall of the contact box. The opening size E×F of the cabinet bushing corresponding to different busbar specifications is shown in Table 1.

[0037] Table 1:

[0038] Busbar specifications 2-100×10 2-80×12 80×10 60×12 Opening size (E×F) 112×42 92×48 92×22 72×24

[0039] With the help of 3D finite element analysis software, electric field verification and insulation optimization research were carried out on the bushings through the cabinet. Figure 2A three-dimensional simulation model of the bushing of a 40.5kV air-insulated switchgear is given.

[0040] When using 3D finite element analysis software for calculation, a 95kV power frequency voltage is applied to the high-voltage conductor inside the bushing of the 40.5kV air-insulated switchgear, and a zero potential is applied to the grounding shielding net, etc., and then the electric field distribution on the surface of the bushing of the 40.5kV air-insulated switchgear is simulated and calculated. According to the simulation calculation results, the electric field strength is relatively concentrated at the cabinet opening of the 40.5kV air-insulated switchgear, the vertical intersection of the busbar and the cabinet shell opening, and the surrounding areas. The highest field strength on the surface of the bushing appears between the insulating hanging plate and the first shed at the center of the bushing, and the maximum field strength can reach 2.02kV / mm.

[0041] From the simulation calculation results, the electric field distribution of the high-voltage shielding net inside the cabinet bushing and the surface of the grounding shielding net of the 40.5kV air-insulated switchgear was intercepted respectively. By analyzing the electric field distribution of the high-voltage shielding net inside the cabinet bushing and the surface of the grounding shielding net of the 40.5kV air-insulated switchgear, it can be seen that due to the mutual shielding between the high-voltage shielding net and the cabinet busbar, the field strength of the air gap between the inside of the cabinet bushing and the busbar is relatively low. The high-field strength area is mainly concentrated between the high-voltage shielding net and the grounding shielding net inside the insulation of the cabinet bushing, and the field strength at the ends of the high-voltage shielding net and the grounding shielding net is relatively high.

[0042] Table 2 shows the electric field strength at key positions of the bushing of the 40.5kV air-insulated switchgear under the power frequency withstand voltage test. From the simulation calculation results, the maximum field strength on the surface of the bushing is 2.02kV / mm, which is basically equivalent to the control field strength of 2kV / mm; the maximum field strength on the surface of the high-voltage shielding net inside the bushing is 8.876kV / mm, which is lower than 9.38kV / mm and meets the field strength control requirements; the maximum field strength on the surface of the grounding shielding net inside the bushing is 6.825kV / mm, which is lower than 9.38kV / mm and meets the field strength control requirements.

[0043] Table 2:

[0044]

[0045] Since the maximum surface field strength of the 40.5kV cabinet bushing exceeds the control value, under long-term operation conditions, if harsh environmental conditions such as humidity and dirt are considered, partial discharge or corona discharge may occur inside or on the surface of the cabinet bushing, which will cause irreversible aging and damage to the epoxy resin solid insulation, which is not conducive to the long-term stable operation of the cabinet bushing. In view of this, it is necessary to optimize the design of the high-voltage shielding net and grounding shielding net inside the cabinet bushing.

[0046] In order to analyze the influence of the size parameter changes of the high-voltage shielding net and the grounding shielding net on the electric field distribution inside the bushing, the electric field analysis method is first used to analyze the bushing with a double shielding structure. Considering that the bushing of the 40.5kV air-insulated switchgear is approximately a coaxial cylindrical structure, a simplified model of the bushing can be established, such as Figure 3 shown.

[0047] In the simplified model, the radius of the high-voltage shielding net is r1, the radius of the grounding shielding net is r2, the two layers of shielding nets (high-voltage shielding net and grounding shielding net) are insulators, the material of the insulators is epoxy resin composite material, the distance between the high-voltage shielding net and the grounding shielding net is a, the potential of the high-voltage shielding is U, and the potential of the grounding shielding is 0. Therefore, the maximum field strength E inside the simplified model can be derived max for:

[0048]

[0049] It can be seen that the highest field strength E max It has nothing to do with the relative dielectric constant of the insulating part. Changing the relative dielectric constant of the insulating material will not affect the electric field strength distribution inside the cabinet bushing. max The influence of the distance a between the two layers of shielding mesh inside the bushing is relatively large, and the influence of the radius r1 of the high-voltage shielding mesh is relatively small.

[0050] When optimizing the bushing, the electric field distribution inside the bushing can be adjusted by changing the spacing a between the two layers of shielding nets. In order to reduce the maximum field strength inside the bushing, it is necessary to increase the spacing a between the high-voltage shielding net and the grounding shielding net. Considering that the radius r1 of the high-voltage shielding net inside the bushing is basically close to the inner diameter of the insulating part, it is difficult to further reduce the radius r1 of the high-voltage shielding net, and it will cause problems in the production and manufacturing of the bushing. In view of this, the maximum field strength inside the bushing can be reduced by increasing the radius r2 of the grounding shielding net.

[0051] According to the simulation calculation results, the structural parameters of the cabinet bushing are optimized, specifically the radius r2 of the grounding shielding net is optimized. According to the simulation calculation results, as the radius r2 of the grounding shielding net increases, the maximum field strength at the upper end of the high-voltage shielding net and the grounding shielding net inside the cabinet bushing gradually decreases, the maximum field strength on the surface of the insulating part gradually decreases, while the maximum field strength at the lower end of the high-voltage shielding net and the grounding shielding net gradually increases. When the radius r2 of the grounding shielding net gradually increases from 112.5mm to 127.5mm, the maximum field strength of the upper end of the high-voltage shielding net inside the cabinet bushing gradually decreases from 9.62kV / mm to 7.92kV / mm, and the maximum field strength of the lower end gradually increases from 8.45kV / mm to 8.99kV / mm; the maximum field strength of the upper end of the grounding shielding net gradually decreases from 7.02kV / mm to 5.71kV / mm, and the maximum field strength of the lower end gradually increases from 6.34kV / mm to 6.84kV / mm; the maximum field strength of the surface of the insulating part gradually decreases from 2.02kV / mm to 1.59kV / mm. Considering that if the radius r2 of the grounding shielding net is too large, it will further increase the difficulty of manufacturing the cabinet bushing, and the maximum field strength of the high-voltage shielding net inside the cabinet bushing and the lower end of the grounding shielding net are also gradually increasing. Therefore, the radius r2 of the grounding shielding net inside the cabinet bushing can be increased by 5mm based on the original design, which can effectively improve the electric field distribution inside the cabinet bushing. At this time, the maximum field strength on the surface of the high-voltage shielding net inside the cabinet bushing is 9.01kV / mm, and the maximum field strength on the surface of the grounding shielding net is 6.57kV / mm, both lower than 9.38kV / mm, which can meet the field strength control requirements; the maximum field strength on the surface of the insulating part is 1.74kV / mm, which can meet the field strength control requirements. Compared with the original design, the maximum field strength on the surface of the high-voltage shielding net is reduced by 6.35%, the maximum field strength on the surface of the low-voltage shielding net is reduced by 6.34%, and the maximum field strength on the surface of the cabinet bushing is reduced by 13.86%.

[0052] According to the standard GB3906-2006, the optimized cabinet bushing was subjected to wet, hot and electrical aging tests. According to the test results, no obvious change was found in the appearance of the optimized cabinet bushing before and after aging, and no defects such as cracks were found on the surface of the optimized cabinet bushing. After aging, the optimized cabinet bushing passed the pressure test in a humid state; before and after aging of the optimized cabinet bushing, the normal power frequency pressure test was passed.

[0053] Optionally, in the above technical solution, it also includes:

[0054] S3. A five-protection padlock device is installed at the grounding switch operation hole and the circuit breaker push operation hole of the air-insulated switchgear.

[0055] Among them, adding a five-protection padlock device to the grounding switch operating hole can also increase the manual operation procedure and improve reliability.

[0056] Among them, a five-protection padlock device is set at the circuit breaker push operation hole. A dedicated person must open the five-protection padlock device before turning the swing-in hole baffle to operate the trolley. It can also increase the manual operation procedure and improve reliability.

[0057] Optionally, in the above technical solution, it also includes:

[0058] S4. A valve mechanism is installed on the air-insulated switchgear. When the trolley of the air-insulated switchgear is moved from the working position to the test position or the isolation position, the valve mechanism automatically closes and locks; when the trolley is pushed into the air-insulated switchgear, the valve mechanism opens. This can effectively prevent personnel from accidentally opening the valve and contacting the live static contacts. A position where a mechanical lock can be hung should be set at the valve mechanism or the pushing mechanism.

[0059] In another embodiment, data related to valve operation is collected, such as personnel identity information, operation time, operation location, operation method, etc. These data can be obtained through sensors, cameras, identity recognition systems and other devices. The collected data is preprocessed, including data cleaning, format conversion, feature extraction, etc. The purpose of this step is to convert the original data into a form suitable for deep learning algorithm processing, and use the preprocessed data to train the deep learning model. The model can be a convolutional neural network (CNN), a recurrent neural network (RNN) or a combination thereof, which is used to classify and identify user operation behaviors, and analyze user operation behaviors using a trained deep learning model. The module can determine whether the user operation complies with the specifications and whether there is a risk of misoperation. When the risk of misoperation is detected, the module will issue a warning signal and take corresponding intervention measures, such as preventing the valve from opening and issuing an alarm.

[0060] In another embodiment, sensors, cameras and other equipment are deployed to collect data related to valve operation, clean and convert the collected data, and extract features useful for deep learning model training. Select a suitable deep learning framework and algorithm, such as TensorFlow or PyTorch, use the preprocessed data to train the deep learning model, and adjust the model parameters to improve the accuracy of classification and recognition. The trained deep learning model is deployed to the system to monitor and analyze user operation behaviors in real time. When the risk of misoperation is detected, the system issues a warning signal and displays relevant information so that the staff can handle it in time. According to the warning signal, the system can take corresponding intervention measures, such as preventing the valve from opening, issuing an alarm, etc. Misoperation events can be recorded for subsequent analysis and improvement.

[0061] When using TensorFlow for training, use Learning Rate Decay to gradually reduce the learning rate during training. Too high a learning rate may cause the model to be unstable during training, while too low a learning rate may make the training process very slow. Therefore, the model convergence speed can be accelerated by dynamically adjusting the learning rate. Specifically, use adaptive learning rate algorithms, such as the Adam optimizer, which can adaptively adjust the learning rate based on the first-order and second-order moment estimates of the model parameters.

[0062] Among them, the num_workers parameter of DataLoader is used to load the preprocessed data using multithreading. By increasing the value of num_workers, multiple data batches can be loaded in parallel, thereby increasing the data reading speed, and using the pin_memory parameter of DataLoader, the loaded data is pre-allocated to CUDA's pinned memory, which can reduce the data transmission time from the CPU to the GPU. During the training process, by enabling automatic mixed precision AMP, half-precision floating point numbers (FP16) can be used during training, thereby saving memory and speeding up calculations. At the same time, AMP can also automatically handle the scaling of gradients to ensure the training stability of the model.

[0063] To prevent the model from overfitting, the Adam optimizer can further control the complexity of the model by adding a weight decay term, which is achieved by adding a penalty term proportional to the weight size to the loss function.

[0064] Optionally, the emergency manual tripping mechanism is installed on the circuit breaker room panel with an operation protection device to prevent accidental contact. At the same time, it should not have a padlock function. When the circuit breaker needs to be tripped urgently, the circuit breaker tripping function can be achieved without opening the door.

[0065] Optionally, the trolley room should be equipped with a forced door closing operation locking device. The trolley room door must be closed before the trolley can be swing in, and the trolley must be returned to the test position before the door can be opened, but an emergency unlocking function must be set.

[0066] Optionally, when the rear cover (door) of the air-insulated switch cabinet needs to be opened, the lower part should be opened first and then the upper part; when the rear cover (door) of the air-insulated switch cabinet needs to be closed, the upper part should be closed first and then the lower part.

[0067] Optionally, when the rear door of the air-insulated switchgear is not closed, the grounding switch of the air-insulated switchgear cannot be opened; the rear door of the air-insulated switchgear can be opened only after the grounding switch is closed.

[0068] Optionally, an earthing switch is provided for the air-insulated switch cabinet, and the operating handle can be removed only after the earthing switch is opened and closed in place, to ensure the correctness and reliability of the operation.

[0069] Optionally, in the above technical solution, it also includes:

[0070] S5. A fan is provided for the air-insulated switch cabinet, and a protective net is provided at the air inlet of the fan.

[0071] The fan configuration plan needs to take into account the air inlet and heat dissipation channel. The layout and design of the relevant heat dissipation holes must take into account the pressure relief requirements. A protective net should be installed at the bottom of the cabinet top fan, and a protective net should be installed at the fan's air inlet to prevent foreign matter from entering the air insulated switchgear.

[0072] The rated current of the branch bus is 1250A, and no fan is configured; when the rated current of the branch bus is 2500A, the number and location of the fans to be installed can be determined based on the structure. Metal fans should be used, and a fan fault alarm node should be added to the signal circuit.

[0073] Optionally, in the above technical solution, it also includes:

[0074] S6. A heater and a dehumidifier are configured for the air-insulated switchgear. The temperature and humidity controller starts and stops the heater according to the start and stop conditions corresponding to the heater, and the temperature and humidity controller starts and stops the dehumidifier according to the start and stop conditions corresponding to the dehumidifier;

[0075] Among them, the installation position of the heater should be as far away as possible from the primary components, secondary components and secondary wires of the air-insulated switchgear. The distance between the installation position of the heater and the primary components, secondary components and secondary wires shall not be less than 50mm to prevent aging of the primary components, secondary components and secondary wires.

[0076] Among them, the temperature and humidity controller can be specifically a chip, and the chip is implanted with programs of "starting and stopping the heater according to the start and stop conditions corresponding to the heater" and "starting and stopping the dehumidifier according to the start and stop conditions corresponding to the dehumidifier".

[0077] The heating power of the heater can be set according to actual conditions.

[0078] Among them, the start and stop conditions corresponding to the heater are: when the temperature is ≤5℃, the temperature and humidity controller controls the heater to start, and when the temperature is ≥15℃, the temperature and humidity controller controls the heater to stop running.

[0079] Among them, the start and stop conditions corresponding to the dehumidifier are: when the relative humidity is ≥75%, the temperature and humidity controller controls the dehumidifier to start, and when the relative humidity is ≤65%, the temperature and humidity controller controls the dehumidifier to stop running.

[0080] The heater is covered with a silicone rubber jacket to prevent burns.

[0081] It should be noted that dehumidifiers (extractors) and the like can be added according to actual conditions.

[0082] Optionally, in the above technical solution, it also includes:

[0083] S7. Install electromagnetic locks on air-insulated switchgear. To prevent accidental entry into live compartments when there is no grounding switch, an electromagnetic lock should be installed on the back door of the cabinet. The recommended model is DSN-AMY / AMZ.

[0084] Optionally, in the above technical solution, it also includes:

[0085] S8. LED lights are respectively provided for the instrument room and cable room of the air-insulated switchgear.

[0086] Optionally, in the above technical solution, it also includes:

[0087] S9. A padlock hole is reserved on the door of the air-insulated switch cabinet, and the diameter of the padlock hole is not less than 8.5mm. It can restrict non-professionals from opening it at will, and the padlock can be used according to the actual situation.

[0088] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0089] The present invention also provides an optimized air-insulated switch cabinet obtained by any of the above-mentioned methods for optimizing the primary interface of an air-insulated switch cabinet.

[0090] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0091] The present invention also provides an optimized air-insulated switch cabinet obtained by any of the above-mentioned air-insulated switch cabinet component optimization methods.

[0092] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A component optimization method for an air-insulated switchgear, characterized in that: include: Simulate the double-shielded bushing used in air-insulated switchgear. According to the simulation calculation results, the structural parameters of the cabinet bushing are optimized.

2. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: A five-protection padlock device is respectively arranged at the grounding switch operation hole and the circuit breaker push operation hole of the air-insulated switch cabinet.

3. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: A valve mechanism is arranged on the air-insulated switch cabinet. When the trolley of the air-insulated switch cabinet is moved from the working position to the test position or the isolation position, the valve mechanism is automatically closed and locked; when the trolley is pushed into the air-insulated switch cabinet, the valve mechanism is opened.

4. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: The air-insulated switch cabinet is equipped with a fan, and the air inlet of the fan is provided with a protective net.

5. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: A heater and a dehumidifier are configured for the air-insulated switchgear. The temperature and humidity controller performs start and stop control on the heater according to the start and stop conditions corresponding to the heater. The temperature and humidity controller performs start and stop control on the dehumidifier according to the start and stop conditions corresponding to the dehumidifier.

6. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: An electromagnetic lock is installed on the air-insulated switchgear.

7. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: The instrument room and the cable room of the air-insulated switch cabinet are respectively equipped with LED lamps.

8. The component optimization method of an air-insulated switchgear according to claim 1, characterized in that: Also includes: A padlock hole is reserved on the cabinet door of the air-insulated switch cabinet, and the hole diameter of the padlock hole is not less than 8.5 mm.

9. A component optimization method for an air-insulated switchgear according to any one of claims 1 to 8, characterized in that: The air-insulated switch cabinet is a 40.5 kV air-insulated switch cabinet, and the cabinet depth of the 40.5 kV air-insulated switch cabinet is 2800 mm or 3100 mm.

10. An optimized air-insulated switchgear obtained by the component optimization method of an air-insulated switchgear according to any one of claims 1 to 9.

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