A voltage transformer testing device and its usage method

Abstract

The invention provides a voltage transformer testing device and a use method thereof, which relate to the technical field of voltage transformer testing, and include an installation platform, an electric-controlled turntable, a voltage transformer, an electric-controlled telescopic cylinder and an electric door, and also include an execution unit and a control unit. The execution unit includes a detection box fixedly connected to the surface of the installation platform, an air pressure regulating plate is arranged inside the detection box, the air pressure regulating plate is used to adjust the air pressure inside the detection box, an adjustment box is arranged inside the detection box, a plurality of filter blocks are arranged in an annular array inside the adjustment box, an adjustment gear is arranged on the upper surface of the adjustment box, a plurality of first blocking blocks are arranged in an annular array on the surface of the adjustment box, and the control unit includes a data acquisition module, a prediction and control module, and an error feedback module. The three parameters of temperature, humidity and air pressure in the detection process of the invention are linked and controllable, which improves the restoration degree and control accuracy of the voltage transformer to the real working condition in the factory test stage.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformer testing, and particularly to a voltage transformer testing device and a using method thereof. Background Art

[0002] A voltage transformer tester is a high-precision and intelligent on-site testing device, mainly used for error measurement and performance evaluation of voltage transformers;

[0003] Existing voltage transformers need to be tested at the time of factory shipment to determine whether they are qualified. Existing voltage transformer testing devices usually only support static simulation of a single environmental parameter and are difficult to switch to a multi-dimensional combined environment of temperature, humidity, and air pressure. However, the operating environments of voltage transformers include high temperature, high pressure, low temperature, or high humidity environments, such as the influence of high altitude (low pressure) areas on the insulation performance of transformers or special equipment with protective gas filled in voltage transformers. The test results in a single environment at the time of factory shipment are likely to deviate from the actual operating conditions of the voltage transformer. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a voltage transformer testing device, in which the three parameters of temperature, humidity, and air pressure are controllable in a linked manner during the detection process, improving the reduction degree and control accuracy of the actual working conditions of the voltage transformer in the factory test stage.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A voltage transformer testing device includes an installation platform. An electric control turntable is installed on the surface of the installation platform. A plurality of voltage transformers are arranged in a circular array on the surface of the electric control turntable. An electric control telescopic cylinder is installed on the surface of the electric control turntable. An electric door is arranged above the installation platform, including: an execution unit and a control unit;

[0007] The execution unit includes:

[0008] A detection box is fixedly connected to the surface of the installation platform. An air pressure adjusting plate is arranged inside the detection box and is used for adjusting the air pressure inside the detection box. An adjusting box is arranged inside the detection box. A plurality of filter blocks are arranged in a circular array inside the adjusting box. An adjusting gear is arranged on the upper surface of the adjusting box. A plurality of first blocking blocks are arranged in a circular array on the surface of the adjusting box. Through the cooperation of the adjusting gear and the first blocking blocks, the number of gases flowing through the filter blocks into the detection box is adjusted to adjust the humidity of the gases flowing out of the adjusting box;

[0009] The control unit includes:

[0010] A data acquisition module for collecting real-time environmental data during the detection process through sensors;

[0011] A prediction and regulation module for predicting environmental data at the next moment based on historical environmental data and generating corresponding regulation strategies according to the predicted environmental data;

[0012] An error feedback module for comparing the real-time environmental data with the predicted environmental data, calculating the error, and correcting the strategy.

[0013] Furthermore, predicting environmental data at the next moment based on historical environmental data includes:

[0014] Constructing a multi-dimensional time series input window based on a set time step, and inputting the historical environmental data into the trained time series prediction model to output the corresponding predicted environmental data at the next moment.

[0015] Furthermore, generating corresponding regulation strategies according to the predicted environmental data includes:

[0016] Comparing the predicted environmental data at the next moment with the set preset range of environmental data, and judging whether the environmental variable is about to exceed the preset range based on the comparison result; when the predicted environmental data tends to the upper limit or the lower limit, generating corresponding regulation instructions according to the error change trend to achieve dynamic adjustment of the environmental data.

[0017] Furthermore, comparing the real-time environmental data with the predicted environmental data, calculating the error, and correcting the strategy includes:

[0018] Obtaining the environmental data at the current moment collected by the sensor, calculating the difference with the environmental prediction data at the corresponding moment output by the time series prediction model to obtain the temperature error, humidity error, and air pressure error; adjusting the control strategy according to the change trend of the error to improve the stability and accuracy of environmental control.

[0019] Furthermore, inspection tables are respectively slidably connected in first chutes formed in a circular array on the surface of the electric control turntable, voltage transformers are respectively installed on the surfaces of the corresponding inspection tables, a second chute is formed on the surface of the installation platform, an arc-shaped chute is formed on the surface of the inspection table, an arc-shaped block is fixedly connected to the end of the output shaft of the electric control telescopic cylinder, the inspection table is slidably connected to the arc-shaped block through the arc-shaped chute, a plug is installed on one side of the inspection table away from the electric control telescopic cylinder, a corresponding socket is installed in the second chute formed on the surface of the installation platform, the electric control telescopic cylinder pushes the corresponding inspection table into the second chute to make the plug inserted into the socket, a test host is installed on the surface of the test box, and the test host is electrically connected to the corresponding voltage transformer through the plug, socket, and wire.

[0020] Further, the electric door is installed on the surface of the detection box. Inside the detection box, a U-shaped plate is fixedly connected. On the surface of the U-shaped plate, a second air bucket is fixedly connected. Inside the detection box, an atomizing nozzle is installed, and the atomizing nozzle is located inside the second air bucket. The adjustment box is fixedly connected to the upper surface of the U-shaped plate. Inside the adjustment box, mounting frames are fixedly connected in an annular array. Filter blocks are respectively fixedly connected inside the corresponding mounting frames. The adjustment gear is rotationally connected to the adjustment box through a first bearing and a first dynamic seal. Air vents are provided on the surface of the adjustment gear, and the inside of the air vents is communicated with the inside of the second air bucket. The air pressure adjustment plate is slidably connected inside the detection box. On the surface of the air pressure adjustment plate, first connecting rods are symmetrically arranged. The first connecting rods are hinged to the air pressure adjustment plate. The ends of the first connecting rods are respectively hinged with moving blocks. Inside the detection box, a left and right threaded screw rod is rotationally connected through two second bearings. The moving blocks are threadedly connected to the left and right threaded screw rod. The upper surface of the moving blocks abuts against the inner top surface of the detection box. A first motor is installed on the surface of the detection box, and the output shaft of the first motor is fixedly connected to the left and right threaded screw rod.

[0021] Further, third air buckets are fixedly connected to the surfaces of the mounting frames. Inside a first circular groove provided on the surface of the third air bucket, a first circular pipe is fixedly connected. Inside the first circular pipe, a T-shaped plug is fixedly connected through an extension rod. A sliding sleeve is slidably connected inside the T-shaped plug. A second spring is arranged inside the T-shaped plug, and the two ends of the second spring are respectively fixedly connected to the T-shaped plug and the first circular pipe.

[0022] Further, a first air bucket is fixedly connected to the surface of the adjustment gear. Inside a first through groove provided on the surface of the first air bucket, a first connecting pipe is rotationally connected through a second bearing and a second dynamic seal. The other end of the first connecting pipe is fixedly connected inside a second through groove provided on the surface of the second air bucket. An electromagnet is installed on the surface of the first air bucket, and the central axis of the electromagnet is perpendicular and intersects with the central axis of the adjustment gear. Support rods are fixedly connected in an annular array on the upper surface of the U-shaped plate. T-shaped rods are fixedly connected to the surfaces of the support rods. A plurality of iron sheets are slidably connected to the T-shaped rods. A first spring is arranged between adjacent two of the iron sheets, and the two ends of the first spring are respectively fixedly connected to the corresponding iron sheets. The central axes of the iron sheets are all perpendicular and intersect with the central axis of the adjustment gear. A first connecting rod is fixedly connected to the surface of the iron sheet close to the support rod. A first plug is fixedly connected to the surface of the first connecting rod. Third sliding grooves are provided in an annular array on the surface of the adjustment box. The first plug is slidably connected inside the corresponding third sliding groove. A roller is arranged below the first plug, and the roller abuts against the first plug. The roller is installed on the upper surface of the U-shaped plate.

[0023] Furthermore, the surface of the U-shaped plate is rotatably connected to a rotating rod via a third bearing, the end of the rotating rod is fixedly connected to a driving gear, the driving gear is meshingly connected to the adjusting gear, the surface of the rotating rod is fixedly connected to a first bevel gear, the surface of the U-shaped plate is rotatably connected to a second connecting rod via a fourth bearing seat, the end of the second connecting rod is fixedly connected to a second bevel gear, the second bevel gear is meshingly connected to the first bevel gear, a second motor is installed on the surface of the detection box, and the output shaft of the second motor is fixedly connected to the second connecting rod.

[0024] A method for testing a voltage transformer comprises the following steps:

[0025] Step 1: Install the voltage transformer on the surface of the test bench, and electrically connect the voltage transformer to the plug on the surface of the test bench through a wire, open the electric door and start the electric control telescopic cylinder, so that the electric control telescopic cylinder pushes the corresponding voltage transformer into the interior of the test box;

[0026] Step 2: The voltage transformer passes through the detection table and slides along the first slide groove and the second slide groove and enters the interior of the detection box until the plug is plugged into the socket, and the gas of the set temperature is passed into the interior of the adjustment box through the pipeline, and the second motor is started, so that the second motor drives the adjustment gear to rotate through the transmission of the second bevel gear, the first bevel gear and the driving gear until the vent rotates to the set position, and then the electromagnet is energized. The energization of the electromagnet causes the iron sheet to move toward the electromagnet and compress the first spring. The movement of the iron sheet causes the corresponding first connecting rod to drive the first blocking block to slide inside the third slide groove toward the interior of the adjustment box until the side of the first blocking block away from the first connecting rod conflicts with the inner wall of the adjustment box;

[0027] Step three, the airflow in step two flows into the regulating box. In the process of flowing through the filter block, the sliding sleeve overcomes the elastic potential energy of the second spring and moves in the direction away from the first circular tube, so that the airflow flows from the gap between the sliding sleeve and the first circular tube to the next filter block, so that the airflow entering the regulating box flows in a clockwise direction. After the airflow enters the regulating box and passes through a set number of the filter blocks, it flows into the first air hopper from the vent under the obstruction of the first blocking block, and enters the second air hopper through the pipeline. The airflow entering the second air hopper entrains the water mist sprayed by the atomizing nozzle and blows into the voltage transformer inside the U-shaped plate through the uniform small holes on the surface of the U-shaped plate to simulate the temperature and humidity environment of the voltage transformer during actual use. By starting the first motor, the air pressure regulating plate is driven to move inside the detection box under the transmission of the positive and negative screw rods, the moving block and the first connecting rod, so that the air pressure inside the detection box changes, simulating the air pressure environment of the voltage transformer during actual use.

[0028] Step 4: After the detection is completed, open the electric door, retract the electric telescopic cylinder, and pull the detection table into the corresponding second chute through the arc-shaped block until the voltage transformer is reset. Then start the electric turntable to rotate the adjacent undetected voltage transformer to the position corresponding to the first chute, and repeat the above steps to start the detection of the second voltage transformer.

[0029] The above solution of the present invention has at least the following beneficial effects:

[0030] In the above solution of the present invention, the number of filter blocks through which the air flow passes is controlled by the cooperation of the adjusting gear and the first stopper to adjust the humidity; the volume of the detection area is changed by the movement of the air pressure adjusting plate inside the detection box, thereby changing the air pressure in the detection area. The cooperation of components such as the electromagnet, iron sheet, first spring and first stopper enables the air flow to flow out from the air vent after passing through a set number of filter blocks. The cooperation of components such as the sliding sleeve and the first round pipe enables the gas entering the adjustment box to flow in a clockwise direction, thereby facilitating the control of the number of filter blocks through which the air flow passes. The stability of the device for simulating the temperature, humidity and air pressure environment is improved through the control unit, thereby enhancing the restoration degree and control accuracy of the real working conditions of the voltage transformer during the factory test stage. Description of the Drawings

[0031] Figure 1 is the overall structural schematic diagram provided by the present invention.

[0032] Figure 2 is the schematic diagram of the U-shaped plate in the present invention.

[0033] Figure 3 is the schematic diagram of the second connecting rod in the present invention.

[0034] Figure 4 is the schematic diagram of the first bevel gear in the present invention.

[0035] Figure 5 is the schematic diagram of the third air bucket in the present invention.

[0036] Figure 6 is the schematic diagram of the iron sheet in the present invention.

[0037] Figure 7 is the schematic diagram of the arc-shaped block in the present invention.

[0038] Figure 8 is the present invention Figure 5 The enlarged view of part A.

[0039] Figure 9 is the schematic diagram of the control unit in the present invention.

[0040] In the figure: 101, installation platform; 102, voltage transformer; 103, electric control turntable; 104, electric control telescopic cylinder; 105, electric door;

[0041] 201, detection box; 202, U-shaped plate; 203, air pressure adjustment plate; 204, first connecting rod; 205, moving block; 206, right and left threaded rod; 207, first motor; 208, adjustment box; 209, adjustment gear; 210, first air hopper; 211, second air hopper; 212, atomizing nozzle; 213, support rod; 214, T-shaped rod; 216, iron sheet; 217, first spring; 218, first connecting rod; 219, first plug; 220, roller; 221, third chute; 222, installation frame; 223, filter block; 224, third air hopper; 225, first round tube; 226, sliding sleeve; 227, T-shaped plug; 228, second spring; 229, electromagnet; 230, rotating rod; 231, driving gear; 232, first bevel gear; 233, second bevel gear; 234, second connecting rod; 235, second motor; 236, first connecting pipe; 2091, air vent;

[0042] 301, detection table; 302, arc groove; 303, arc block;

[0043] 401, intake pipe; 402, outlet pipe. Specific embodiments

[0044] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0045] As Figures 1 to 9 shown, an embodiment of the present invention provides a voltage transformer testing device, including an installation platform 101, an electric control turntable 103 is installed on the surface of the installation platform 101, a plurality of voltage transformers 102 are arranged in a circular array on the surface of the electric control turntable 103, an electric control telescopic cylinder 104 is installed on the surface of the electric control turntable 103, an electric door 105 is arranged above the installation platform 101, including: an execution unit and a control unit;

[0046] The execution unit includes:

[0047] The surface of the installation platform 101 is fixedly connected with a detection box 201. Inside the detection box 201, there is a pneumatic regulating plate 203 which is used to regulate the air pressure inside the detection box 201. Inside the detection box 201, there is an adjustment box 208. Inside the adjustment box 208, a number of filter blocks 223 are arranged in a circular array. On the upper surface of the adjustment box 208, there is an adjustment gear 209. On the surface of the adjustment box 208, a number of first blocking blocks 219 are arranged in a circular array. Through the cooperation of the adjustment gear 209 and the first blocking blocks 219, the number of gas flows passing through the filter blocks 223 and entering the detection box 201 is adjusted to regulate the humidity of the gas flowing out of the adjustment box 208.

[0048] The control unit includes:

[0049] A data acquisition module, which is used to collect real-time environmental data during the detection process through sensors;

[0050] A prediction and regulation module, which is used to predict the environmental data at the next moment according to the historical environmental data and generate a corresponding regulation strategy according to the predicted environmental data;

[0051] An error feedback module, which is used to compare the real-time environmental data with the predicted environmental data, calculate the error and correct the strategy.

[0052] In the embodiment of the present invention, an intake pipe 401 and an outlet pipe 402 are respectively fixedly connected in the first through groove and the second through groove opened on the surface of the detection box 201. The intake pipe 401 is communicated with the inside of the adjustment box 208, and the outlet pipe 402 is communicated with the inside of the detection box 201. The intake pipe 401 is communicated with the output port of an external heating or cooling device, and the outlet pipe 402 is communicated with the inlet of an external heating or cooling device to complete the air flow circulation between the external heating or cooling device and the inside of the detection box 201. When the output power of the heating or cooling device is constant, the pneumatic regulating plate 203 slides inside the first air hopper 210 to change the air pressure in the area below the pneumatic regulating plate 203 inside the detection box 201, so as to simulate the air pressure environment in the actual use environment of the voltage transformer 102.

[0053] By adjusting the number of filter blocks 223 through which the air flow entering the adjustment box 208 flows, the humidity of the air flow entering the second air hopper 211 is adjusted, so as to output an air flow with a set temperature and humidity into the U-shaped plate 202, thereby simulating the actual use environment of the voltage transformer 102 during the detection process.

[0054] The filter block 223 close to the intake pipe 401 in the clockwise direction only has the function of filtering air impurities and does not filter the moisture in the air, so as to facilitate the increase of the humidity of the air flow entering the detection box 201 by the atomizing nozzle 212.

[0055] The control unit is a closed-loop control system for regulating the detection environment of the voltage transformer 102, which is divided into three functional modules: a data acquisition module, a prediction and regulation module, and an error feedback module;

[0056] The data acquisition module is responsible for obtaining environmental data in the detection environment in real time through sensors, and sending the collected environmental data to the subsequent module after normalization processing;

[0057] The environmental data specifically includes temperature value, humidity value, and air pressure value, and the detection environment specifically includes the area inside the detection box 201 between the air pressure regulating plate 203 and the installation platform 101;

[0058] When using the physical quantity of environmental data as the input of the model, considering that the three have different physical units and numerical ranges, in order to prevent training deviation and enhance the operability of variable comparison, a normalization processing method is used to perform unified dimension conversion on the input data. The preferred method includes min-max normalization to achieve training and high-precision prediction under a unified scale.

[0059] Based on historical environmental data, the prediction and regulation module predicts the environmental state at the next moment through a time series prediction algorithm, combines the predicted value with the preset range, and generates corresponding regulation strategies. The regulation strategies include starting heating, cooling, humidifying, dehumidifying, pressurizing, and depressurizing, and intervening in advance in the change of environmental variables to improve the control responsiveness.

[0060] The error feedback module calculates the error by comparing the real-time environmental data collected by the actual sensor with the environmental prediction value output by the prediction and regulation module, and judges whether the regulation strategy is effective, lagging, over-adjusted, or has too large a deviation. If the error exceeds the allowable range, the regulation strategy is corrected to improve the system stability and control accuracy;

[0061] It should be noted that the working principles and usage processes of the heating device (not shown in the figure) and the refrigeration device (not shown in the figure) are well known in the prior art and will not be elaborated in detail here.

[0062] Predicting the environmental data at the next moment based on historical environmental data includes:

[0063] Construct a multi-dimensional time series input window based on a set time step, and input the historical environmental data into the trained time series prediction model to output the corresponding predicted environmental data at the next moment.

[0064] In the embodiment of the present invention, the environmental data collected by the data acquisition module from a variety of sensors continuously samples the environmental variables according to a preset time step and stores them in the database in chronological order to obtain a continuous time series data sequence, that is, the historical environmental data sequence;

[0065] Based on historical environmental data, a multi-dimensional time series input window is constructed. The output window is a sliding window that contains environmental data samples at multiple consecutive moments, forming an input feature matrix.

[0066] The constructed multi-dimensional time series input window is used as input data and input into the trained time series prediction model, and the predicted environmental data for the corresponding next moment is output. The predicted environmental data includes the predicted temperature value, predicted humidity value, and predicted air pressure value for the next moment.

[0067] The construction and training of the time series prediction model include:

[0068] During the construction of the time series prediction model, an ADF stationarity test is performed on each variable sequence. If the sequence is non-stationary, such as a slightly slow upward trend in temperature, it is converted into a stationary sequence by using first-order differencing:

[0069] ;

[0070] Among them, is the first-order difference value of the time series T at time t, is the environmental data temperature, air pressure, and humidity values at time t, represents the temperature value at the previous moment. Differencing is performed on the three variables of temperature, air pressure, and humidity respectively until the ADF test is passed and the test is repeated until it is stationary;

[0071] On the basis of the sequence being stationary, the Akaike Information Criterion AIC is used to evaluate the goodness of fit of the time series prediction model under different lag orders, and the lag order corresponding to the minimum AIC value is selected as the optimal lag order parameter of the time series prediction model.

[0072] The historical environmental data within the set time scale is selected as the sample set. The sample set is divided into a training set and a validation set according to a ratio of 8:2. The training set is input into the constructed time series prediction model, and the least squares method is used to fit the parameter matrix of the time series prediction model, and iterative solution is performed until the error of the time series prediction model converges to the preset range, completing the model training process.

[0073] Validate the trained time series prediction model. Input the validation set into the trained time series prediction model for prediction testing. Use the mean squared error (MSE) to evaluate the prediction accuracy between the prediction results and the actual values. At the same time, use the Ljung-Box test to analyze the residuals of the time series prediction model to determine whether it satisfies the white noise distribution and ensure that the model has no autocorrelation. If the performance of the time series prediction model does not meet the set requirements, modify the sample window length or retrain the model parameters, and re-execute the stationarity test and training process until the performance of the time series model meets the application requirements.

[0074] The standard form of the Akaike information criterion (AIC) is:

[0075] ;

[0076] where is the maximum likelihood function of the time series prediction model, is the natural logarithm of the maximum likelihood function, is the product of the square of the number of variables and the lag order. Set the range of the lag order to [1, n], where n is a set value. For each lag order, construct and train a time series prediction model, calculate the value of each model, compare the values corresponding to each order, record the minimum value, and select the lag order corresponding to the minimum value as the optimal order of the finally used time series prediction model;

[0077] Construct multiple time series prediction models according to different lag orders. Each time series prediction model will perform a fitting operation on the time series data, that is, use the least squares method through the training data to solve the parameters of the time series prediction model, so that the deviation between the predicted value of the time series prediction model and the actual data is as small as possible. After the time series prediction model is fitted, input the training data into the time series prediction model for prediction. The difference between the predicted value and the actual observed value at each time point is called the residual. Combine all the residual vectors to calculate a residual covariance matrix. Under the assumption that the error terms follow a multivariate normal distribution, the logarithmic form of the maximum likelihood function contains the determinant term of the residual covariance matrix. The likelihood estimation result of the time series prediction model is negatively correlated with the determinant of the residual covariance matrix. By calculating the determinant of the residual covariance matrix, the goodness of fit of the model can be indirectly evaluated. In practical applications, although the error terms do not necessarily strictly satisfy the multivariate normal distribution, the parameter estimation method adopted in the present invention is robust and can still ensure the effectiveness of the time series prediction model structure and prediction effect.

[0078] The Ljung-Box test is used to analyze the residuals of the time series prediction model to determine whether it satisfies the white noise distribution and ensure that the time series prediction model has no autocorrelation, including:

[0079] S001, calculate the residual sequence;

[0080] S002, perform autocorrelation analysis on the residual sequence, that is, determine whether the current residual has a regularity with the previous residuals, and set the maximum lag order of the test , and calculate the residual sample autocorrelation coefficients from order 1 to in turn:

[0081] ;

[0082] Among them, is the autocorrelation coefficient of the -th order residual, is the residual at the -th time point, is the average value of the residual sequence,

[0083] is the total length of the residual sequence, is the current autocorrelation lag order, and a set of autocorrelation coefficients are obtained step by step:

[0084] ;

[0085] Through calculation, further judge whether it significantly deviates from the white noise hypothesis of "zero autocorrelation", and the test statistic :

[0086] ;

[0087] Among them, is the sample size of the residual sequence, is the maximum lag order, used to set the autocorrelation order for detection, is the sample autocorrelation coefficient of the -th order residual, is the cumulative test for autocorrelation from the 1st order to the -th order; the null hypothesis is that the residual is white noise, that is, there is no autocorrelation; the alternative hypothesis is that the residual has significant autocorrelation; the value of the maximum lag order is used as the degree of freedom, and the test statistic and the degree of freedom are substituted into the chi-square distribution function to find the right-tail cumulative probability :

[0088] ;

[0089] Among them indicates that the degree of freedom takes The chi-square distribution of values is the probability function;

[0090] If > S indicates not rejecting the null hypothesis, the residual is white noise, and there is no significant autocorrelation; if ≤ S indicates rejecting the null hypothesis, there is autocorrelation in the residual, and the time series prediction model needs to be readjusted. In this embodiment, S takes the value of 0.05.

[0091] Generate corresponding control strategies according to the predicted environmental data, including:

[0092] Compare the predicted environmental data at the next moment with the preset range of the set environmental data, and judge whether the environmental variable is about to exceed the preset range based on the comparison result; when the predicted environmental data tends to the upper limit or the lower limit, generate corresponding control instructions according to the error change trend to achieve dynamic adjustment of the environmental data.

[0093] In the embodiment of the present invention, through the time series prediction model constructed and trained as described above, short-term trend prediction is performed on the environmental data in the detection box to obtain the predicted environmental variable value at the next moment. The prediction results include the predicted temperature value, the predicted humidity value, and the predicted air pressure value. Upper and lower limit thresholds are set for each environmental variable, and the prediction results are respectively compared with the corresponding upper and lower limit thresholds to judge whether the predicted value has a tendency to approach the upper limit or the lower limit. When the predicted value approaches or is about to exceed the set threshold, it is determined that there is a "risk of crossing the boundary" for the current environmental variable, and control adjustment needs to be carried out in advance;

[0094] The set range of the environmental variable W is:

[0095] Temperature setting interval: ; Humidity setting interval: ; Air pressure setting interval: .

[0096] Specifically, comparing each predicted value with the upper and lower limit thresholds of the corresponding variable is as follows:

[0097] ;

[0098] Among them, is the approaching value of the environmental variable to the upper threshold, is the approaching value of the environmental variable to the lower threshold, is the upper threshold of the environmental variable, is the lower threshold of the environmental variable, is the predicted value of the environmental variable at the next moment.

[0099] Set the proximity threshold Y. If the proximity value is less than the set proximity threshold Y, it is determined that the predicted value approaches the boundary, that is, there is a "risk of crossing the boundary".

[0100] The regulation instructions include:

[0101] When the temperature predicted value is close to the upper limit, a cooling instruction is generated, that is, the temperature of the air flow passing into the inside of the adjustment box 208 is reduced;

[0102] When the temperature predicted value is close to the lower limit, a heating instruction is generated, that is, the temperature of the air flow passing into the inside of the adjustment box 208 is increased;

[0103] When the humidity predicted value is close to the lower limit, a humidification instruction is generated, that is, the flow rate of the water mist sprayed by the atomizing nozzle 212 is reduced. When the flow rate of the water mist sprayed by the atomizing nozzle 212 is 0, the number of filter blocks 223 through which the air flow passing into the inside of the adjustment box 208 flows is increased;

[0104] When the humidity predicted value is close to the lower limit, a humidification instruction is generated, that is, the number of filter blocks 223 through which the air flow passing into the inside of the adjustment box 208 flows is reduced. When the number of filter blocks 223 passed through is 1, the flow rate of the water mist sprayed by the atomizing nozzle 212 is increased;

[0105] If the air pressure predicted value is close to the upper limit, a pressure reduction instruction is generated, that is, the air pressure adjustment plate 203 is raised inside the detection box 201;

[0106] If the air pressure predicted value is close to the lower limit, a pressure increase instruction is generated, that is, the air pressure adjustment plate 203 is lowered inside the detection box 201.

[0107] Compare the real-time environmental data with the predicted environmental data, calculate the error and correct the strategy, including:

[0108] Obtain the environmental data at the current moment collected by the sensor, and perform a difference calculation with the environmental prediction data at the corresponding moment output by the time series prediction model to obtain the temperature error, humidity error and air pressure error; according to the change trend of the error, adjust the control strategy to improve the stability and accuracy of environmental control.

[0109] In the embodiment of the present invention, a difference calculation is performed on the real-time data and the predicted data to obtain the prediction error of each environmental variable, and the change trend of the prediction error is analyzed. If the error of a certain variable continues to increase, fluctuates violently, or shows continuous high or low, the correction mechanism of the control strategy will be triggered;

[0110] Perform equal-length segmentation on the historical sequence of prediction errors, calculate the moving averages of the first half and the second half respectively, set the error trend threshold, compare the difference between the two segment means with the error trend threshold. If the difference between the means is greater than the error trend threshold, the error shows an upward trend; if the difference between the means is less than the error trend threshold, the error shows a downward trend; if the absolute value of the difference between the means is less than or equal to the error trend threshold, the error region is stable.

[0111] The correction strategies include:

[0112] When the error exceeds the error trend threshold, feedback the error information to the online training process of the time series prediction model for online incremental training, update the parameters of the time series prediction model to improve the prediction accuracy;

[0113] When the error continuously exceeds the error trend threshold for a set number of times, stop the detection and let manual intervention for maintenance.

[0114] Detection platforms 301 are respectively slidably connected in first sliding grooves formed in a circular array on the surface of the electric control turntable 103. Voltage transformers 102 are respectively installed on the surfaces of the corresponding detection platforms 301. A second sliding groove is formed in the surface of the installation platform 101. An arc-shaped groove 302 is formed in the surface of the detection platform 301. The end of the output shaft of the electric control telescopic cylinder 104 is fixedly connected with an arc-shaped block 303. The detection platform 301 is slidably connected with the arc-shaped block 303 through the arc-shaped groove 302. A plug is installed on one side of the detection platform 301 away from the electric control telescopic cylinder 104. A corresponding socket is installed in the second sliding groove formed in the surface of the installation platform 101. The electric control telescopic cylinder 104 pushes the corresponding detection platform 301 into the second sliding groove to make the plug inserted into the socket, and a test host is installed on the surface of the detection box 201. The test host is electrically connected with the corresponding voltage transformer 102 through the plug, the socket and a wire.

[0115] In the embodiment of the present invention, when batch detecting the voltage transformers 102, first fix the voltage transformers 102 on the surfaces of the voltage transformers 102, electrically connect them with the corresponding plugs through wires. Through the expansion and contraction of the electric control telescopic cylinder 104, the voltage transformers 102 are moved into or out of the interior of the detection box 201 through the detection platforms 301 along the first sliding groove and the second sliding groove. When the side of the detection platform 301 away from the electric control telescopic cylinder 104 abuts against the inner wall of the second sliding groove, the plug is inserted into the corresponding socket, so that the test host is electrically connected with the corresponding socket of the detection platform 301, that is, the test host is electrically connected with the corresponding voltage transformer 102.

[0116] The electric door 105 is installed on the surface of the detection box 201. Inside the detection box 201, a U-shaped plate 202 is fixedly connected. On the surface of the U-shaped plate 202, a second air hopper 211 is fixedly connected. Inside the detection box 201, an atomizing nozzle 212 is installed. The atomizing nozzle 212 is located inside the second air hopper 211. The adjustment box 208 is fixedly connected to the upper surface of the U-shaped plate 202. Inside the adjustment box 208, mounting frames 222 are fixedly connected in an annular array. Filter blocks 223 are respectively fixedly connected inside the corresponding mounting frames 222. The adjustment gear 209 is rotationally connected to the adjustment box 208 through a first bearing and a first dynamic seal. On the surface of the adjustment gear 209, air vents 2091 are formed. The inside of the air vents 2091 is communicated with the inside of the second air hopper 211. The air pressure adjustment plate 203 is slidably connected inside the detection box 201. On the surface of the air pressure adjustment plate 203, first connecting rods 204 are symmetrically arranged. The first connecting rods 204 are hinged to the air pressure adjustment plate 203. The ends of the first connecting rods 204 are respectively hinged with moving blocks 205. Inside the detection box 201, a left-right threaded screw rod 206 is rotationally connected through two second bearings. The moving blocks 205 are threadedly connected to the left-right threaded screw rod 206. The upper surface of the moving blocks 205 abuts against the inner top surface of the detection box 201. On the surface of the detection box 201, a first motor 207 is installed. The output shaft of the first motor 207 is fixedly connected to the left-right threaded screw rod 206.

[0117] In the embodiment of the present invention, after the voltage transformer 102 enters the inside of the detection box 201, the electric door 105 is closed. The detection area of the voltage transformer 102 is the area inside the detection box 201 below the air pressure adjustment plate 203. The two U-shaped surfaces of the U-shaped plate 202 are respectively attached to the inner wall of the detection box 201, so that the air flow in the second air hopper 211 blows into the U-shaped plate 202 and is combed through the small holes uniformly formed on the surface of the U-shaped plate 202, so that the voltage transformer 102 inside the U-shaped plate 202 is blown by a uniform air flow. After the air flow enters the inside of the adjustment box 208, it flows in a clockwise direction and continuously flows through the filter blocks 223 inside the mounting frames 222. By rotating the adjustment gear 209, the air flow flows through a certain number of filter blocks 223 and then enters the inside of the first air hopper 210 through the air vents 2091, and enters the inside of the second air hopper 211 through a pipeline. The air flow flowing out from the inside of the second air hopper 211 flows through the inside of the U-shaped plate 202, and the air flow flowing out from the inside of the U-shaped plate 202 flows back to the heating or cooling device through the air outlet pipe 402. The water mist sprayed by the atomizing nozzle 212 is used to cooperate with the filter blocks 223 to adjust the humidity of the circulating air flow inside the detection box 201;

[0118] The operation of the first motor 207 drives the rotation of the positive and negative lead screw 206, so that the two moving blocks 205 move in the direction of approaching or separating. The movement of the moving block 205 drives the air pressure adjusting plate 203 to move downward or upward inside the detection box 201 through the first connecting rod 204, thereby changing the volume of the detection area and changing the air pressure inside the detection area;

[0119] The surfaces of the mounting frame 222 are fixedly connected with third air buckets 224. A first round tube 225 is fixedly connected in a first round groove opened on the surface of the third air bucket 224. A T-shaped plug 227 is fixedly connected inside the first round tube 225 through an extension rod. A sliding sleeve 226 is slidably connected inside the T-shaped plug 227. A second spring 228 is arranged inside the T-shaped plug 227. Two ends of the second spring 228 are fixedly connected with the T-shaped plug 227 and the first round tube 225 respectively.

[0120] In the embodiment of the present invention, after the air flow enters the inside of the adjustment box 208, it passes through the filter block 223 and then enters the inside of the third air bucket 224, and the air pressure inside the third air bucket 224 increases. The increased air pressure causes the sliding sleeve 226 to move inside the T-shaped plug 227 in the direction of overcoming the elastic potential energy of the second spring 228 until the sliding sleeve 226 no longer blocks the first round tube 225. At this time, the air flow flows to the next filter block 223 through the gap between the sliding sleeve 226 and the first round tube 225, and at the same time prevents the air flow from moving in the counterclockwise direction, so as to adjust the humidity of the air flow by controlling the number of filter blocks 223 through which the air flow passes.

[0121] The surface of the adjusting gear 209 is fixedly connected with a first air bucket 210. A first connecting pipe 236 is rotatably connected in a first through groove formed on the surface of the first air bucket 210 through a second bearing and a second dynamic seal. The other end of the first connecting pipe 236 is fixedly connected in a second through groove formed on the surface of the second air bucket 211. An electromagnet 229 is installed on the surface of the first air bucket 210. The central axis of the electromagnet 229 is perpendicular to and intersects with the central axis of the adjusting gear 209. Support rods 213 are fixedly connected to the upper surface of the U-shaped plate 202 in an annular array. A T-shaped rod 214 is fixedly connected to the surface of the support rod 213. A plurality of iron sheets 216 are slidably connected to the T-shaped rod 214. A first spring 217 is arranged between adjacent two iron sheets 216. The two ends of the first spring 217 are respectively fixedly connected to the corresponding iron sheets 216. The central axes of the iron sheets 216 are perpendicular to and intersect with the central axis of the adjusting gear 209. A first connecting rod 218 is fixedly connected to the surface of the iron sheet 216 close to the support rod 213. A first plug 219 is fixedly connected to the surface of the first connecting rod 218. Third sliding grooves 221 are formed on the surface of the adjusting box 208 in an annular array. The first plug 219 is slidably connected inside the corresponding third sliding groove 221. A roller 220 is arranged below the first plug 219. The roller 220 abuts against the first plug 219. The roller 220 is installed on the upper surface of the U-shaped plate 202.

[0122] A rotating rod 230 is rotatably connected to the surface of the U-shaped plate 202 through a third bearing. A driving gear 231 is fixedly connected to the end of the rotating rod 230. The driving gear 231 is meshed with the adjusting gear 209. A first bevel gear 232 is fixedly connected to the surface of the rotating rod 230. A second connecting rod 234 is rotatably connected to the surface of the U-shaped plate 202 through a fourth bearing seat. A second bevel gear 233 is fixedly connected to the end of the second connecting rod 234. The second bevel gear 233 is meshed with the first bevel gear 232. A second motor 235 is installed on the surface of the detection box 201. The output shaft of the second motor 235 is fixedly connected to the second connecting rod 234.

[0123] In an embodiment of the present invention, by starting the second motor 235, the second connecting rod 234 drives the second bevel gear 233 to rotate. The rotation of the second bevel gear 233 drives the driving gear 231 on the surface of the rotating rod 230 to rotate through the first bevel gear 232. The rotation of the driving gear 231 drives the adjusting gear 209 to rotate until the adjusting gear 209 rotates to a set position. At this time, the central axis of the electromagnet 229 coincides with the central axis of one of the T-shaped rods 214, and the electromagnet 229 is powered on. Under the magnetic attraction, the iron sheet 216 moves on the surface of the T-shaped rod 214 towards the electromagnet 229 until the surface of the first blocking block 219 away from the first connecting rod 218 abuts against the inner wall of the adjusting box 208. At this time, the air flow cannot flow downward through the first blocking block 219 to the next filter block 223, that is, the air flow passes through a set number of filter blocks 223 and then flows from the ventilation port 2091 into the first air hopper 210 and enters the second air hopper 211 through the first connecting pipe 236. The role of the roller 220 is to reduce the moving resistance of the first blocking block 219. When the adjusting gear 209 needs to rotate, the power supply to the electromagnet 229 is stopped, and the first blocking block 219 is reset under the action of the elastic potential energy of the first spring 217.

[0124] A test method for a voltage transformer specifically includes the following steps:

[0125] Step 1, install the voltage transformer 102 on the surface of the detection table 301, and electrically connect the voltage transformer 102 to the plug on the surface of the detection table 301 through a wire. Open the electric door 105 and start the electric control telescopic cylinder 104 to push the corresponding voltage transformer 102 into the detection box 201 by the electric control telescopic cylinder 104.

[0126] Step 2, the voltage transformer 102 slides along the first chute and the second chute through the detection table 301 and enters the detection box 201 until the plug is inserted into the socket. Inject gas at a set temperature into the adjusting box 208 through a pipeline, and start the second motor 235. The second motor 235 drives the adjusting gear 209 to rotate through the transmission of the second bevel gear 233, the first bevel gear 232 and the driving gear 231 until the ventilation port 2091 rotates to the set position. Then, power on the electromagnet 229. The power-on of the electromagnet 229 causes the iron sheet 216 to move towards the electromagnet 229 and compresses the first spring 217. The movement of the iron sheet 216 causes the corresponding first connecting rod 218 to drive the first blocking block 219 to slide into the adjusting box 208 inside the third chute 221 until the surface of the first blocking block 219 away from the first connecting rod 218 abuts against the inner wall of the adjusting box 208.

[0127] Step 3: The air flow in Step 2 enters the air flow inside the adjustment box 208. During the process of flowing through the filter block 223, the sliding sleeve 226 moves away from the first circular tube 225 against the elastic potential energy of the second spring 228, allowing the air flow to flow from the gap between the sliding sleeve 226 and the first circular tube 225 to the next filter block 223, so that the air flow entering the adjustment box 208 flows in a clockwise direction. After the air flow enters the adjustment box 208 and passes through a set number of filter blocks 223, it flows into the first air bucket 210 through the ventilation port 2091 under the blockage of the first blocking block 219 and enters the second air bucket 211 through a pipeline. The air flow entering the second air bucket 211 carries the water mist sprayed by the atomizing nozzle 212 and blows it into the voltage transformer 102 inside the U-shaped plate 202 through the small holes on the surface of the U-shaped plate 202 to simulate the temperature and humidity environment of the voltage transformer 102 during actual use. By starting the first motor 207, under the transmission of the right and left screw rod 206, the moving block 205 and the first connecting rod 204, the air pressure adjustment plate 203 is driven to move inside the detection box 201, changing the air pressure inside the detection box 201 to simulate the air pressure environment of the voltage transformer 102 during actual use;

[0128] Step 4: After the detection is completed, open the electric door 105, contract the electric control telescopic cylinder 104, and pull the detection table 301 into the corresponding second sliding groove through the arc-shaped block 303 until the voltage transformer 102 is reset. Start the electric control turntable 103 to rotate the adjacent undetected voltage transformer 102 to a position corresponding to the first sliding groove, and repeat the above steps to start the detection of the second voltage transformer 102.

[0129] It should be noted that: The test host (not shown in the figure) specifically includes a standard transformer, a voltage regulating device, a grounding device, a load simulator and a power supply. The test host is electrically connected to the socket through a wire so that when the plug and socket are plugged, the test host is electrically connected to the voltage transformer 102. The working principles and usage methods of the test host, the electric control turntable 103, the electric control telescopic cylinder 104, the electric door 105 and the wire are well known in the prior art and will not be elaborated in detail here;

[0130] The moving door surface of the electric door 105 is provided with a groove corresponding to the shape of the voltage transformer 102. When the electric door 105 is in the closed state, the moving door of the electric door 105 is in close contact with the voltage transformer 102, which is convenient for keeping the detection box 201 isolated from the outside air;

[0131] The adjustment box 208 is cylindrical in shape, and its upper surface is provided with an annular groove for facilitating the fixation of the installation frame 222;

[0132] The atomizing nozzle 212 externally connects to a pump body through a pipeline to spray water vapor into the second air hopper 211. This is a prior art and will not be elaborated in detail here.

[0133] A first reserved hole is provided on the surface of the detection box 201 so that the output shaft of the first motor 207 extends into the interior of the detection box 201 and is fixedly connected to the right and left screw rod 206. A second reserved hole is provided on the surface of 201 so that the output shaft of the second motor 235 extends into the interior of the detection box 201 and is fixedly connected to the second connecting rod 234.

[0134] The center of the electric control turntable 103 is a fixed seat, and the outer side of the fixed seat is an annular turntable. The electric control telescopic cylinder 104 is installed on the fixed seat of the electric control turntable 103, which is convenient for the electric control telescopic cylinder 104 to push the corresponding voltage transformer 102 into the interior of the detection box 201.

[0135] In this embodiment, the connection method of the pipeline is to fix the end of the pipeline in the reserved opening by opening a reserved opening so that the pipeline communicates with the interior of the reserved opening. This is well-known in the prior art and will not be elaborated in detail here.

[0136] The elastic coefficient of the second spring 228 is small, and the influence on the air pressure introduced into the adjustment box 208 can be ignored.

[0137] The cross-sectional shape of the arc groove 302 is C-shaped, which is convenient for the electric control telescopic cylinder 104 to hook the arc groove 302 through the arc block 303 to drive the detection table 301 to move towards the direction close to the electric control telescopic cylinder 104.

[0138] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A voltage transformer testing device, comprising an installation platform, an electric control turntable is installed on the surface of the installation platform, a plurality of voltage transformers are arranged on the surface of the electric control turntable in an annular array, an electric control telescopic cylinder is installed on the surface of the electric control turntable, and an electric door is arranged above the installation platform, characterized in that, Including: An execution unit and a control unit; The execution unit includes: The surface of the installation platform is fixedly connected with a detection box, and an air pressure regulating plate is arranged inside the detection box. The air pressure regulating plate is used to regulate the air pressure inside the detection box. An adjustment box is arranged inside the detection box. A plurality of filter blocks are arranged in an annular array inside the adjustment box. An adjustment gear is arranged on the upper surface of the adjustment box. A plurality of first blocking blocks are arranged in an annular array on the surface of the adjustment box. Through the cooperation of the adjustment gear and the first blocking blocks, the number of gases flowing into the detection box and passing through the filter blocks is adjusted to adjust the humidity of the gases flowing out of the adjustment box; The control unit includes: A data acquisition module for acquiring real-time environmental data during the detection process through sensors; A prediction and regulation module for predicting the environmental data at the next moment according to the historical environmental data and generating a corresponding regulation strategy according to the predicted environmental data; An error feedback module for comparing the real-time environmental data with the predicted environmental data, calculating the error and correcting the strategy; A U-shaped plate is fixedly connected inside the detection box. A second air bucket is fixedly connected to the surface of the U-shaped plate. A plurality of mounting frames are fixedly connected in an annular array inside the adjustment box. Third air buckets are fixedly connected to the surfaces of the mounting frames. A first circular pipe is fixedly connected inside a first circular groove opened on the surface of the third air bucket. A T-shaped blocking block is fixedly connected inside the first circular pipe through an extension rod. A sliding sleeve is slidably connected inside the T-shaped blocking block. A second spring is arranged inside the T-shaped blocking block. Two ends of the second spring are respectively fixedly connected with the T-shaped blocking block and the first circular pipe; A first air bucket is fixedly connected to the surface of the adjustment gear. A first connecting pipe is rotatably connected through a second bearing and a second dynamic seal inside a first through groove opened on the surface of the first air bucket. The other end of the first connecting pipe is fixedly connected inside a second through groove opened on the surface of the second air bucket. An electromagnet is installed on the surface of the first air bucket. The central axis of the electromagnet is perpendicular and intersects with the central axis of the adjustment gear. A plurality of support rods are fixedly connected in an annular array on the upper surface of the U-shaped plate. A T-shaped rod is fixedly connected to the surface of the support rod. A plurality of iron sheets are slidably connected to the T-shaped rod. A first spring is arranged between adjacent two of the iron sheets. Two ends of the first spring are respectively fixedly connected with the corresponding iron sheets. The central axes of the iron sheets are all perpendicular and intersect with the central axis of the adjustment gear. A first connecting rod is fixedly connected to the surface of the iron sheet close to the support rod. The first blocking block is fixedly connected to the surface of the first connecting rod. A plurality of third sliding grooves are opened in an annular array on the surface of the adjustment box. The first blocking block is slidably connected inside the corresponding third sliding groove. A roller is arranged below the first blocking block. The roller abuts against the first blocking block. The roller is installed on the upper surface of the U-shaped plate.

2. The voltage transformer testing device according to claim 1, wherein Predicting the environmental data at the next moment according to the historical environmental data includes: Construct a multi-dimensional time series input window based on a set time step, and input the historical environmental data into the trained time series prediction model to output the corresponding predicted environmental data for the next moment.

3. The voltage transformer testing device according to claim 2, wherein Generate a corresponding regulation strategy according to the predicted environmental data, including: Compare the predicted environmental data for the next moment with the preset range of the set environmental data, and judge whether the environmental variable is about to exceed the preset range based on the comparison result; when the predicted environmental data tends to the upper limit or the lower limit, generate a corresponding regulation instruction according to the error change trend to achieve the dynamic adjustment of the environmental data.

4. The voltage transformer testing device according to claim 3, characterized in that, Compare the real-time environmental data with the predicted environmental data, calculate the error and correct the strategy, including: Obtain the environmental data at the current moment collected by the sensor, calculate the difference with the environmental prediction data at the corresponding moment output by the time series prediction model to obtain the temperature error, humidity error and air pressure error; adjust the control strategy according to the change trend of the error to improve the stability and accuracy of environmental control.

5. The voltage transformer testing device according to claim 4, characterized in that, Detection platforms are respectively slidably connected in the first sliding grooves formed in an annular array on the surface of the electric control turntable, and the voltage transformers are respectively installed on the surfaces of the corresponding detection platforms. A second sliding groove is formed on the surface of the installation platform, and an arc-shaped groove is formed on the surface of the detection platform. The end of the output shaft of the electric control telescopic cylinder is fixedly connected with an arc-shaped block, and the detection platform is slidably connected with the arc-shaped block through the arc-shaped groove. A plug is installed on the side of the detection platform away from the electric control telescopic cylinder, and a corresponding socket is installed in the second sliding groove formed on the surface of the installation platform. The electric control telescopic cylinder pushes the corresponding detection platform into the second sliding groove to make the plug inserted into the socket. A test host is installed on the surface of the detection box, and the test host is electrically connected with the corresponding voltage transformer through the plug, socket and wire.

6. The voltage transformer testing device according to claim 5, wherein The electric door is installed on the surface of the detection box. An atomizing nozzle is installed inside the detection box, and the atomizing nozzle is located inside the second air hopper. The adjustment box is fixedly connected to the upper surface of the U-shaped plate. The filter blocks are respectively fixedly connected inside the corresponding installation frames. The adjustment gear is rotatably connected to the adjustment box through a first bearing and a first dynamic seal. An air vent is formed on the surface of the adjustment gear, and the inside of the air vent is communicated with the inside of the second air hopper. The air pressure adjustment plate is slidably connected inside the detection box. First connecting rods are symmetrically arranged on the surface of the air pressure adjustment plate. The first connecting rods are hinged to the air pressure adjustment plate, and moving blocks are hinged to the ends of the first connecting rods. A left-right threaded screw rod is rotatably connected inside the detection box through two second bearings. The moving block is threadedly connected to the left-right threaded screw rod, and the upper surface of the moving block abuts against the inner top surface of the detection box. A first motor is installed on the surface of the detection box, and the output shaft of the first motor is fixedly connected to the left-right threaded screw rod.

7. The voltage transformer testing device according to claim 6, characterized in that, The surface of the U-shaped plate is rotatably connected to a rotating rod via a third bearing, an end of the rotating rod is fixedly connected to a driving gear, the driving gear is meshingly connected to the adjusting gear, the surface of the rotating rod is fixedly connected to a first bevel gear, the surface of the U-shaped plate is rotatably connected to a second connecting rod via a fourth bearing seat, an end of the second connecting rod is fixedly connected to a second bevel gear, the second bevel gear is meshingly connected to the first bevel gear, a second motor is installed on the surface of the detection box, and an output shaft of the second motor is fixedly connected to the second connecting rod.

8. A method for testing a voltage transformer, applied to the voltage transformer testing device as claimed in claim 7, comprising the following steps: Step 1: Install the voltage transformer on the surface of the test bench, and electrically connect the voltage transformer to the plug on the surface of the test bench through a wire, open the electric door and start the electric control telescopic cylinder, so that the electric control telescopic cylinder pushes the corresponding voltage transformer into the interior of the test box; Step 2: The voltage transformer passes through the detection table and slides along the first slide groove and the second slide groove into the interior of the detection box until the plug is plugged into the socket, and the gas of the set temperature is passed into the interior of the adjustment box through the pipeline, and the second motor is started, so that the second motor drives the adjustment gear to rotate through the transmission of the second bevel gear, the first bevel gear and the driving gear until the vent rotates to the set position, and then the electromagnet is energized. The energization of the electromagnet causes the iron sheet to move toward the electromagnet and compress the first spring. The movement of the iron sheet causes the corresponding first connecting rod to drive the first blocking block to slide inside the third slide groove toward the interior of the adjustment box until the side of the first blocking block away from the first connecting rod conflicts with the inner wall of the adjustment box; Step three, the airflow in step two flows into the regulating box. In the process of flowing through the filter block, the sliding sleeve overcomes the elastic potential energy of the second spring and moves in the direction away from the first circular tube, so that the airflow flows from the gap between the sliding sleeve and the first circular tube to the next filter block, so that the airflow entering the regulating box flows in a clockwise direction. After the airflow enters the regulating box and passes through a set number of the filter blocks, it flows into the first air hopper from the vent under the obstruction of the first blocking block, and enters the second air hopper through the pipeline. The airflow entering the second air hopper entrains the water mist sprayed by the atomizing nozzle and blows into the voltage transformer inside the U-shaped plate through the uniform small holes on the surface of the U-shaped plate to simulate the temperature and humidity environment of the voltage transformer during actual use. By starting the first motor, the air pressure regulating plate is driven to move inside the detection box under the transmission of the positive and negative screw rods, the moving block and the first connecting rod, so that the air pressure inside the detection box changes, simulating the air pressure environment of the voltage transformer during actual use. Step 4. After the detection is completed, open the electric door, retract the electric telescopic cylinder, and pull the detection platform to the corresponding second slide slot through the arc block until the voltage transformer is reset. Start the electric turntable to rotate the adjacent undetected voltage transformer to the position corresponding to the first slide slot, and repeat the above steps to start the detection of the second voltage transformer.

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