Insulator detection method, device and equipment

Abstract

The present invention discloses an insulator detection method, device, and equipment. The method utilizes an insulator detection circuit for providing a high-voltage power supply signal to the insulator under test. The method comprises: obtaining, when the insulator under test is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator under test; the parameter information includes a shed radius; determining a state data set of the insulator under test based on the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius; and determining a detection state of the insulator under test based on the state data set of the insulator under test. The technical solution of the present invention uses the state data set determined by the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius to reflect the detection state of the insulator under test. Therefore, the accuracy of the detection state of the insulator under test can be improved based on the state data set of the insulator under test.

Description

Technical Field

[0001] The present invention relates to the technical field of insulator detection, and in particular to an insulator detection method, device and equipment. Background Art

[0002] High-voltage transmission lines are responsible for the vital task of transmitting electrical energy. Their safety and reliability directly impact the power system's supply. Insulators are key to ensuring the reliability of high-voltage transmission and distribution overhead lines. Insulator failures can cause widespread regional power outages, impacting power supply reliability.

[0003] For pre-shipment insulator fault detection, existing technology typically directly measures signals such as the insulator's leakage current, calculates the measured signals, and then manually determines whether the insulator is faulty. This method is inefficient when faced with a large number of insulators to be tested, and manual judgment sometimes leads to errors, resulting in low accuracy. Summary of the Invention

[0004] The present invention provides an insulator detection method, device and equipment to improve the accuracy of detecting the state of an insulator to be tested.

[0005] In a first aspect, the present invention provides an insulator detection method, which is performed using an insulator detection circuit, wherein the insulator detection circuit is configured to provide a high-voltage power supply signal to the insulator to be tested. The insulator detection method comprises:

[0006] When the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress and parameter information of the insulator to be tested are obtained; the parameter information includes a shed radius;

[0007] determining a state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius;

[0008] The detection state of the insulator to be tested is determined according to the state data set of the insulator to be tested.

[0009] Optionally, the leakage current signal includes a third harmonic peak value, a fifth harmonic peak value and a fundamental phase angle of the leakage current;

[0010] Determining state data of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius includes:

[0011] Determining a leakage current peak ratio of the insulator to be tested according to the third harmonic peak and the fifth harmonic peak;

[0012] determining the power factor of the insulator to be measured according to the primitive phase angle;

[0013] determining the clean electric field stress of the insulator to be tested according to the flashover electric field stress and the shed radius;

[0014] determining an electric field stress ratio of the insulator to be tested according to the clean electric field stress and the maximum electric field stress;

[0015] A set consisting of the leakage current peak ratio, the power factor, and the electric field stress ratio is determined as a state data set of the insulator to be tested.

[0016] Optionally, the elementary phase angle and the power factor satisfy: β=cos(θ)*100%; wherein β is the power factor, and θ is the elementary phase angle.

[0017] Optionally, the flashover electric field stress, the shed radius and the clean electric field stress satisfy: Eref=Ef / L; wherein Ef is the flashover electric field stress, L is the shed radius, and Eref is the clean electric field stress.

[0018] Optionally, determining the detection state of the insulator to be tested according to the state data set of the insulator to be tested includes:

[0019] Build a fully connected neural network model;

[0020] Obtain a fault state data set of a standard insulator in a fault state and a non-fault state data set of a standard insulator in a non-fault state;

[0021] Training and verifying the fully connected neural network according to the fault state data set and the non-fault state data set to obtain a verified fully connected neural network model;

[0022] The state data set of the insulator to be tested is input into the verified fully connected neural network, and the detection state of the insulator to be tested is output.

[0023] In a second aspect, the present invention provides an insulator detection device, comprising:

[0024] a signal acquisition module, configured to acquire a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator to be tested when the insulator to be tested is electrically connected to the insulator detection circuit; the parameter information includes a shed radius;

[0025] a state data set determining module, configured to determine a state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius;

[0026] The detection state determination module is used to determine the detection state of the insulator to be tested according to the state data set of the insulator to be tested.

[0027] In a third aspect, the present invention provides an insulator detection device, comprising: an insulator detection circuit and a server;

[0028] The insulator detection circuit includes an AC power supply, a current signal detector and an electric field stress detector;

[0029] The AC power supply is used to provide a high-voltage power signal;

[0030] The first end of the current signal detector and the first end of the insulator to be tested are electrically connected to the first end of the AC power supply, and the second end of the current signal detector and the second end of the insulator to be tested are electrically connected to the second end of the AC power supply; the current signal detector is used to detect the leakage current signal of the insulator to be tested;

[0031] The first end of the electric field stress detector is electrically connected to the second end of the insulator to be tested, and the second end of the electric field stress detector is grounded. The electric field stress detector is used to detect the electric field stress signal of the insulator to be tested; the electric field stress signal includes the maximum electric field stress and the flashover electric field stress;

[0032] The server is communicatively connected to the current signal detector and the electric field stress detector respectively, and the server is used to execute the insulator detection method described in the first aspect of the present invention.

[0033] Optionally, the insulator detection circuit further includes a filtering module; the filtering module is electrically connected between the first end of the AC power supply and the first end of the insulator to be tested, and the filtering module is used to filter the high-voltage power signal provided by the AC power supply.

[0034] Optionally, the insulator detection circuit further includes:

[0035] The first voltage dividing module is electrically connected between the first end of the AC power supply and the first end of the current signal detector; the first voltage dividing module is used to divide the voltage of the signals at both ends of the insulator to be tested.

[0036] Optionally, the insulator detection circuit further includes:

[0037] The second voltage dividing module is electrically connected between the second end of the electric field stress detector and the ground end; the second voltage dividing module is used to divide the voltage of the signal output from the second end of the insulator to be tested.

[0038] According to the technical solution of the present invention, when an insulator to be tested is electrically connected to an insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator to be tested are obtained, wherein the parameter information includes a shed radius; a state data set of the insulator to be tested is determined based on the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius; the state data set determined by the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius can reflect the detection state of the insulator to be tested; therefore, the detection state of the insulator to be tested is determined based on the state data set of the insulator to be tested, thereby improving the accuracy of the detection state and avoiding the problem of errors that may occur when the detection state of the insulator to be tested is directly determined through analog signals.

[0039] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A flow chart of an insulator detection method provided by an embodiment of the present invention;

[0042] Figure 2 A flowchart of an insulator detection method provided in the second embodiment of the present invention;

[0043] Figure 3 This is a flow chart of an insulator detection method provided in the third embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of an insulator detection device provided by an embodiment of the present invention;

[0045] Figure 5 A schematic structural diagram of an insulator detection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] Example 1

[0049] Figure 1 The flowchart of an insulator detection method provided by an embodiment of the present invention is applicable to insulator fault detection. The method can be executed by an insulator detection device provided by an embodiment of the present invention, and the insulator detection device is implemented in the form of hardware and / or software. Figure 1 As shown, the insulator detection method includes:

[0050] S11. When the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress and parameter information of the insulator to be tested are obtained.

[0051] The insulator detection circuit provides a high-voltage power signal to the insulator under test, simulating the high-voltage power signal required by the insulator in actual power transmission and distribution overhead lines. Parameter information includes the shed radius, which can be obtained after the insulator is manufactured. A larger shed radius increases the leakage path of the insulator under test, thereby increasing the creepage distance.

[0052] Specifically, when a high-voltage power supply signal is applied to both ends of the insulator to be tested, the leakage current signal of the insulator to be tested can be detected by the current signal detector set in the insulator detection circuit, and the maximum electric field stress and flashover electric field stress of the insulator to be tested can be detected by the electric field stress detector set in the insulator detection circuit.

[0053] It is understandable that the specific structure of the insulator detection circuit can be designed according to actual needs. Under the premise that its functions can be met, the embodiment of the present invention does not limit the specific structure of the insulator detection circuit.

[0054] S12. Determine a state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius.

[0055] Specifically, the leakage current signal may be an analog signal such as a signal wave. The process of directly determining the insulator detection state based on the leakage current signal, maximum electric field stress, flashover electric field stress, and shed radius is relatively complicated or may result in detection errors. Therefore, in this step, the leakage current signal, maximum electric field stress, flashover electric field stress, and shed radius are converted into a state data set to improve the accuracy of the detection state when the detection state of the insulator to be tested is subsequently determined based on the state data set.

[0056] S13. Determine the detection state of the insulator to be tested according to the state data set of the insulator to be tested.

[0057] The state data set is a data set determined by leakage current signal, maximum electric field stress, flashover electric field stress and shed radius. The detection state of the insulator to be tested includes fault state and non-fault state.

[0058] Specifically, since the state data set of the insulator to be tested can reflect the detection state of the insulator to be tested, determining the detection state of the insulator to be tested based on the state data set of the insulator to be tested has a better detection effect.

[0059] The technical solution provided by an embodiment of the present invention obtains a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator to be tested when the insulator to be tested is electrically connected to an insulator detection circuit. The parameter information includes a shed radius. A state data set of the insulator to be tested is determined based on the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius. The state data set determined by the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius can reflect the detection state of the insulator to be tested. Therefore, the detection state of the insulator to be tested is determined based on the state data set of the insulator to be tested, which can improve the accuracy of the detection state and avoid the problem of errors when the detection state of the insulator to be tested is directly determined through analog signals.

[0060] Example 2

[0061] Figure 2This is a flow chart of an insulator detection method provided by the second embodiment of the present invention. Based on the above embodiment, this embodiment describes the situation of determining the status data of the insulator to be tested based on the leakage current signal, maximum electric field stress, flashover electric field stress and shed radius when the leakage current signal includes the third harmonic peak value, fifth harmonic peak value and fundamental phase angle of the leakage current. Figure 2 As shown, the insulator detection method includes:

[0062] S21. When the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress and parameter information of the insulator to be tested are obtained.

[0063] S22. Determine the leakage current crest ratio of the insulator to be tested based on the third harmonic peak value and the fifth harmonic peak value.

[0064] The third harmonic peak value and the fifth harmonic peak value can be calculated by using Fast Fourier Transform (FFT) on the leakage current signal. The leakage current peak ratio is the ratio of the third harmonic peak value to the fifth harmonic peak value.

[0065] S23. Determine the power factor of the insulator to be tested based on the elementary phase angle.

[0066] Specifically, the primitive phase angle is a measure that describes the change in the signal waveform. When the signal wave changes in a periodic manner, the phase reflects the physical quantity of the state of the alternating current at any moment. The primitive phase angle can be calculated from the leakage current signal through Fourier transform. The power factor of the insulator to be tested is determined by the primitive phase angle.

[0067] Optionally, the element phase angle and the power factor satisfy: β=cos(θ)*100%, where β is the power factor and θ is the element phase angle.

[0068] S24. Determine the clean electric field stress of the insulator to be tested based on the flashover electric field stress and the shed radius.

[0069] Among them, the flashover electric field stress refers to the voltage when the gas or liquid medium under high voltage causes destructive discharge along the surface of the insulator under test; the clean electric field stress of the insulator under test is determined by the flashover electric field stress and the shed radius.

[0070] Optionally, the flashover electric field stress, the shed radius, and the clean electric field stress satisfy the following equation: Eref = Ef / L, where Ef is the flashover electric field stress, L is the shed radius, and Eref is the clean electric field stress. That is, the ratio of the flashover electric field stress to the shed radius is the clean electric field stress.

[0071] S25. Determine the electric field stress ratio of the insulator to be tested based on the clean electric field stress and the maximum electric field stress.

[0072] The clean electric field stress represents the electric field stress of the insulator under test in a clean state, and the maximum electric field stress represents the maximum electric field stress of the insulator under test measured in the insulator detection circuit. The electric field stress ratio of the insulator under test is the ratio of the maximum electric field stress to the clean electric field stress.

[0073] S26. Determine a set consisting of the leakage current peak ratio, the power factor, and the electric field stress ratio as a state data set of the insulator to be tested.

[0074] Specifically, the detection status of the insulator to be tested cannot be determined directly based on the leakage current signal, maximum electric field stress, flashover electric field stress, and shed radius. Therefore, after corresponding calculation and transformation of the leakage current signal, maximum electric field stress, flashover electric field stress, and shed radius, a status data set consisting of the leakage current peak ratio, power factor, and electric field stress ratio is obtained, so that the detection status of the insulator to be tested can be subsequently determined based on the status data set.

[0075] S27. Determine the detection status of the insulator to be tested according to the status data set of the insulator to be tested.

[0076] The technical solution provided by the embodiment of the present invention determines the leakage current peak ratio of the insulator to be tested based on the third harmonic peak and the fifth harmonic peak of the leakage current; determines the power factor of the insulator to be tested based on the fundamental phase angle; determines the clean electric field stress of the insulator to be tested based on the flashover electric field stress and the shed radius, and then determines the electric field stress ratio of the insulator to be tested based on the clean electric field stress and the maximum electric field stress; further, a set consisting of the leakage current peak ratio, the power factor, and the electric field stress ratio is determined as a state data set of the insulator to be tested, so that the detection state of the insulator to be tested can be subsequently determined based on the state data set.

[0077] Example 3

[0078] Figure 3 This is a flow chart of an insulator detection method provided by the third embodiment of the present invention. Based on the above embodiment, this embodiment describes the situation of determining the detection status of the insulator to be tested based on the state data set of the insulator to be tested. Figure 3 As shown, the insulator detection method includes:

[0079] S31. When the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress and parameter information of the insulator to be tested are obtained.

[0080] S32. Determine a state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius.

[0081] S33. Build a fully connected neural network model.

[0082] Among them, each neuron node in each layer of the fully connected neural network is connected to all the neuron nodes in the upper and lower layers, and has the characteristic of finding the optimal solution at high speed.

[0083] Exemplarily, the constructed fully connected neural network model includes three fully connected layers. The first layer includes 4 neuron nodes, and the activation function of the first layer is the Relu function. The second layer includes 8 neuron nodes, and the activation function of the second layer is the Sigmoid function. The third layer includes 4 neuron nodes, and the activation function of the third layer is the Tanh function. Among them, the Relu function, the Sigmoid function, and the Tanh function are all nonlinear functions, which mainly complete the nonlinear transformation and data normalization of the data, solve the problem of insufficient expression and analysis capabilities of the linear model, map the input data to a certain range, and then pass it down, thereby limiting the expansion of the data and preventing a risk caused by excessive data.

[0084] S34. Obtain a fault state data set of the standard insulator in a fault state and a non-fault state data set of the standard insulator in a non-fault state.

[0085] Among them, standard insulators refer to insulators that meet national production standards. When all aspects of the performance of standard insulators are intact, they are in a non-fault state. When standard insulators have poor insulation including short circuit, leakage, breakdown, low insulation resistance, etc., they are in a fault state.

[0086] It is understandable that the method of obtaining a large number of fault state data sets of standard insulators in non-fault state and a large number of non-fault state data sets of standard insulators in non-fault state is similar to that of obtaining the state data set of the insulator to be tested, which will not be repeated here.

[0087] S35. Train and verify the fully connected neural network based on the fault state data set and the non-fault state data set to obtain a verified fully connected neural network model.

[0088] Specifically, the acquired fault state data set and non-fault state data set are divided into two parts. One part is used to train the fully connected neural network model. After the training is completed, the other part of the data set is input into the trained fully connected neural network model, and the trained fully connected neural network is verified to obtain a verified fully connected neural network model.

[0089] S36. Input the state data set of the insulator to be tested into the verified fully connected neural network, and output the detection state of the insulator to be tested.

[0090] Specifically, the verified fully connected neural network has high accuracy. After the state data set of the insulator to be tested is input into the neural network model, the accurate detection state of the insulator to be tested can be output, thereby improving the recognition accuracy.

[0091] The technical solution of the embodiment of the present invention constructs a convolutional neural network model, obtains a fault state data set of a standard insulator in a fault state and a non-fault state data set in a non-fault state, trains and verifies a fully connected neural network based on the fault state data set and the non-fault state data set, and obtains a verified fully connected neural network model. Since the verified fully connected neural network model has a high accuracy rate, the state data set of the insulator to be tested is input into the verified fully connected neural network, which can improve the recognition accuracy of the output detection state of the insulator to be tested.

[0092] Example 4

[0093] Figure 4 This is a schematic diagram of the structure of an insulator detection device provided by an embodiment of the present invention. The device is suitable for detecting faults of insulators and can be implemented in the form of hardware and / or software. Figure 4 As shown, the insulator detection device includes:

[0094] The signal acquisition module 10 is used to obtain the leakage current signal, maximum electric field stress, flashover electric field stress and parameter information of the insulator to be tested when the insulator to be tested is electrically connected to the insulator detection circuit; the parameter information includes the shed radius.

[0095] The state data set determination module 20 is used to determine the state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress and the shed radius.

[0096] The detection state determination module 30 is used to determine the detection state of the insulator to be tested according to the state data set of the insulator to be tested.

[0097] The insulator detection device provided in an embodiment of the present invention is used to execute the insulator detection method provided in any embodiment of the present invention, and has the same beneficial effects as the method, which will not be described in detail here.

[0098] Example 5

[0099] Figure 5 A schematic diagram of the structure of an insulator detection device provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the insulator detection device includes: an insulator detection circuit 100 and a server 200.

[0100] The insulator detection circuit 100 includes an AC power supply 40, a current signal detector 50, and an electric field stress detector 60. The AC power supply 40 is configured to provide a high-voltage power signal. A first end of the current signal detector 50 and a first end of the insulator under test 70 are electrically connected to the first end of the AC power supply 40. A second end of the current signal detector 50 and a second end of the insulator under test 70 are electrically connected to the second end of the AC power supply 40, for detecting a leakage current signal from the insulator under test 70. A first end of the electric field stress detector 60 is electrically connected to a second end of the insulator under test 70, and a second end of the electric field stress detector 60 is grounded, for detecting an electric field stress signal from the insulator under test. The electric field stress signal includes maximum electric field stress and flashover electric field stress.

[0101] The first input end of the server 200 is communicatively connected to the third end of the current signal detector 50, and the second input end of the server 200 is communicatively connected to the third end of the electric field stress detector 60, which is used to execute the insulator detection method of any embodiment of the present invention, and has the same beneficial effects as the method, which will not be repeated here.

[0102] The AC power supply 40 in the insulator detection circuit 100 may include a 220V AC power supply and a 220V / 110kV step-up transformer. Specifically, the high-voltage power supply signal received by the insulator under test 70 is obtained by boosting the 220V AC signal with the 220V / 110kV step-up transformer, thereby simulating the high-voltage power supply signal flowing through the insulator under test 70 during actual use. The current signal detector 50 includes an oscilloscope, which can measure the shape of AC or pulse current waves. The oscilloscope has the characteristics of long-term waveform storage, small size, and light weight, facilitating measurement. The electric field stress detector 60 includes an ammeter, etc.

[0103] It is understandable that the above description only uses the example of the AC power supply 40 including a 220V AC power supply and a 220V / 110KV step-up transformer. The internal structure of the AC power supply 40 can be designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0104] Specifically, the AC power supply 40 is used to provide a high-voltage power signal to the insulator under test 70, simulating the high-voltage power signal required by the insulator under test in an actual power transmission and distribution overhead line. The AC power supply 40 is also used to provide the high-voltage power signal to the current signal detector 50, providing the current signal detector 50 with the required electrical energy. The current signal detector 50 is connected in parallel with the insulator under test 70 to measure the leakage current signal of the insulator under test 70. The electric field stress detector 60 is connected in series with the insulator under test 70 to measure the electric field stress signal of the insulator under test 70.

[0105] Optionally, the insulator detection circuit 100 further includes an overcurrent protection module 93, which includes a fifth resistor R5, a sixth resistor R6, and a fuse FU. The first end of the fifth resistor R5 is electrically connected to the second end of the AC power source 40, the second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6 and then to ground, the second end of the sixth resistor R6 is electrically connected to the first end of the fuse FU, and the second end of the fuse FU is electrically connected to the second end of the current signal detector 50. In this manner, when the current flowing through the fuse FU in the insulator detection circuit 100 is greater than or equal to the maximum current threshold of the insulator detection circuit 100, the fuse FU is disconnected, thereby providing overcurrent protection for the insulator detection circuit 100.

[0106] In an optional embodiment, the insulator detection circuit 100 further includes a filter module 80 , which is electrically connected between the first end of the AC power supply 40 and the first end of the insulator to be tested 70 , and is used to filter the high-voltage power signal provided by the AC power supply 40 .

[0107] Exemplarily, the filtering module 80 includes a first resistor R1, a second resistor R2, an inductor L1 and a first capacitor C1. One end of the first resistor R1 and the second resistor R2 connected in parallel is electrically connected to the first end of the AC power supply 40, the other end of the first resistor R1 and the second resistor R2 connected in parallel is electrically connected to the first end of the inductor L1, the second end of the inductor L1 is electrically connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is electrically connected to the first end of the insulator to be tested 70 and the first end of the current signal detector 50. The filtering module 80 composed of the first resistor R1, the second resistor R2, the inductor L1 and the first capacitor C1 is used to filter the high-voltage power signal provided by the AC power supply 40, and then input it to the insulator to be tested 70 and the current signal detector 50, so as to filter out interference signals such as noise in the high-voltage power signal to prevent it from affecting subsequent detection signals.

[0108] In another optional embodiment, the insulator detection circuit 100 further includes: a first voltage divider module 91, electrically connected between the first end of the AC power supply 40 and the first end of the current signal detector 50; the first voltage divider module 91 is used to divide the signals at both ends of the insulator 70 to be tested.

[0109] The first voltage divider module 91 includes a third resistor R3 for dividing the signal at both ends of the insulator 70 to prevent the voltage signal at both ends of the insulator 70 from being too high, which may cause the current signal detector 50 to work abnormally, so that the current signal detector 50 can maintain normal operation.

[0110] It is understandable that the resistance of the third resistor R3 can be set according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0111] In another optional embodiment, the insulator detection circuit 100 further includes: a second voltage divider module 92, electrically connected between the second end of the electric field stress detector 60 and the ground terminal GND; the second voltage divider module 92 is used to divide the signal output from the second end of the insulator to be tested.

[0112] Among them, the second voltage divider module 92 includes a fourth resistor R4, which is used to divide the voltage of the second end output signal of the insulator to be tested 70 to prevent the voltage signal output by the insulator to be tested 70 from being too high, causing the electric field stress detector 60 to work abnormally or be damaged, so that the electric field stress detector 60 maintains normal operation.

[0113] It is understandable that the resistance of the fourth resistor R4 can be set according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0114] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0115] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An insulator detection method, performed using an insulator detection circuit, characterized in that: The insulator detection circuit is used to provide a high-voltage power supply signal to the insulator to be tested. The insulator detection method includes: When the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator to be tested are obtained; the parameter information includes a shed radius; the leakage current signal includes a third harmonic peak value, a fifth harmonic peak value, and a fundamental phase angle of the leakage current; Determining a state data set of the insulator to be measured based on the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius, including: determining a leakage current peak ratio of the insulator to be measured based on the third harmonic peak and the fifth harmonic peak; determining a power factor of the insulator to be measured based on the primitive phase angle; determining a clean electric field stress of the insulator to be measured based on the flashover electric field stress and the shed radius; determining an electric field stress ratio of the insulator to be measured based on the clean electric field stress and the maximum electric field stress; and determining a set consisting of the leakage current peak ratio, the power factor, and the electric field stress ratio as the state data set of the insulator to be measured; The detection state of the insulator to be tested is determined according to the state data set of the insulator to be tested.

2. The insulator detection method according to claim 1, characterized in that: The elementary phase angle and the power factor satisfy: β=cos(θ)*100%; wherein β is the power factor, and θ is the elementary phase angle.

3. The insulator detection method according to claim 1, characterized in that: The flashover electric field stress, the shed radius and the clean electric field stress satisfy: Eref=Ef / L; wherein Ef is the flashover electric field stress, L is the shed radius, and Eref is the clean electric field stress.

4. The insulator detection method according to claim 1, characterized in that: Determining the detection state of the insulator to be tested according to the state data set of the insulator to be tested includes: Build a fully connected neural network model; Obtain a fault state data set of a standard insulator in a fault state and a non-fault state data set of a standard insulator in a non-fault state; Training and verifying the fully connected neural network according to the fault state data set and the non-fault state data set to obtain a verified fully connected neural network model; The state data set of the insulator to be tested is input into the verified fully connected neural network, and the detection state of the insulator to be tested is output.

5. An insulator detection device, characterized in that: Applicable to an insulator detection circuit, comprising: the insulator detection circuit is used to provide a high-voltage power supply signal to the insulator to be tested; a signal acquisition module, configured to acquire, when the insulator to be tested is electrically connected to the insulator detection circuit, a leakage current signal, a maximum electric field stress, a flashover electric field stress, and parameter information of the insulator to be tested; the parameter information includes a shed radius; the leakage current signal includes a third harmonic peak value, a fifth harmonic peak value, and a fundamental phase angle of the leakage current; a state data set determining module, configured to determine a state data set of the insulator to be tested according to the leakage current signal, the maximum electric field stress, the flashover electric field stress, and the shed radius; The state data set determination module is specifically configured to determine a leakage current peak ratio of the insulator to be measured based on the third harmonic peak and the fifth harmonic peak; determine a power factor of the insulator to be measured based on the primitive phase angle; determine a clean electric field stress of the insulator to be measured based on the flashover electric field stress and the shed radius; determine an electric field stress ratio of the insulator to be measured based on the clean electric field stress and the maximum electric field stress; and determine a set consisting of the leakage current peak ratio, the power factor, and the electric field stress ratio as the state data set of the insulator to be measured; The detection state determination module is used to determine the detection state of the insulator to be tested according to the state data set of the insulator to be tested.

6. An insulator detection device, characterized in that: include: Insulator detection circuit and server; The insulator detection circuit includes an AC power supply, a current signal detector and an electric field stress detector; The AC power supply is used to provide a high-voltage power signal; The first end of the current signal detector and the first end of the insulator to be tested are electrically connected to the first end of the AC power supply, and the second end of the current signal detector and the second end of the insulator to be tested are electrically connected to the second end of the AC power supply; the current signal detector is used to detect the leakage current signal of the insulator to be tested; The first end of the electric field stress detector is electrically connected to the second end of the insulator to be tested, the second end of the electric field stress detector is grounded, and the electric field stress detector is used to detect the electric field stress signal of the insulator to be tested; The electric field stress signal includes the maximum electric field stress and the flashover electric field stress; The server is communicatively connected to the current signal detector and the electric field stress detector respectively, and the server is used to execute the insulator detection method according to any one of claims 1 to 4.

7. The insulator detection device according to claim 6, characterized in that: The insulator detection circuit further includes a filter module; the filter module is electrically connected between the first end of the AC power supply and the first end of the insulator to be tested, and the filter module is used to filter the high-voltage power signal provided by the AC power supply.

8. The insulator detection device according to claim 6, characterized in that: The insulator detection circuit further includes: The first voltage dividing module is electrically connected between the first end of the AC power supply and the first end of the current signal detector; the first voltage dividing module is used to divide the voltage of the signals at both ends of the insulator to be tested.

9. The insulator detection device according to claim 6, characterized in that: The insulator detection circuit further includes: The second voltage divider module is electrically connected between the second end of the electric field stress detector and the ground end; the second voltage divider module is used to divide the voltage of the signal output from the second end of the insulator to be tested.

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