Method for measuring intensity of high-voltage direct-current electric field and related device

Abstract

The invention belongs to the field of data processing, and particularly relates to a high-voltage direct-current electric field intensity measuring method and a related device. In the device, an optical fiber direct-current electric field sensor at least comprises a signal processing unit, an optical fiber voltage sensing head, a fixed electrode and a rotating electrode. The method comprises the following steps: deploying a measuring device in a space to be measured; the rotating electrode is controlled to rotate at a constant speed, so that the center distance between the fixed electrode and the rotating electrode is periodically changed along with the rotating track; collecting an alternating current signal voltage generated by an alternating potential difference between the fixed electrode and the rotating electrode in a constant-speed rotating process through an optical fiber voltage sensing head; and performing numerical processing on the alternating current signal voltage through a signal processing unit to obtain a measured value of the high-voltage direct current electric field intensity, and optimizing the measured value in combination with a physical compensation model and a data driving compensation model. The method can realize the measurement of the high-voltage direct-current space electric field intensity, improve the measurement accuracy and expand the measurement range.

Description

Technical Field

[0001] This application belongs to the field of data processing, and particularly relates to a method for measuring the high-voltage direct-current electric field intensity and related devices. Background Art

[0002] One of the important differences between high-voltage direct-current electric fields and high-voltage alternating-current electric fields is that the amplitude of the high-voltage direct-current electric field intensity has no periodic change, and there is an ion current in the electric field.

[0003] In related technologies, due to the above differences, when measuring the high-voltage direct-current space electric field intensity, the direct-current electric field sensor must use as few metal parts as possible, and its volume and size must be as small as possible to prevent the sensor body from distorting the space electric field and causing measurement errors. The inspection parts of the sensor must have as high a direct-current insulation resistance as possible. At the same time, there must be an extremely high direct-current insulation resistance and direct-current withstand voltage between the sensor and the ground. And the above measurement conditions limit make it difficult to measure the high-voltage direct-current space electric field intensity.

[0004] Therefore, there is an urgent need to design a brand-new technical solution to solve the problem of measuring the high-voltage direct-current space electric field intensity and improve the measurement accuracy and measurement range. Summary of the Invention

[0005] This application provides a method for measuring the high-voltage direct-current electric field intensity and related devices to realize the measurement of the high-voltage direct-current space electric field intensity, which helps to improve the measurement accuracy and expand the measurement range.

[0006] In a first aspect, this application provides a method for measuring the high-voltage direct-current electric field intensity. This method is applied to a measurement device provided with an optical fiber direct-current electric field sensor. The optical fiber direct-current electric field sensor at least includes a signal processing unit, an optical fiber voltage sensing head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the optical fiber voltage sensing head, and the rotating electrode is connected to a second signal input terminal provided in the optical fiber voltage sensing head; the fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode; the optical fiber voltage sensing head is an optical fiber voltage sensing head based on the Pockels electro-optic effect principle; this method includes:

[0007] Deploy the measurement device in the space to be measured;

[0008] Control the rotating electrode to rotate at a constant speed so that the central distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory;

[0009] Collect, through the optical fiber voltage sensing head, the alternating-signal voltage generated due to the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation;

[0010] The numerical processing of the AC signal voltage is performed by a signal processing unit to obtain a measured value of the high-voltage DC electric field strength;

[0011] A monitoring platform is provided outside the measuring device and connected to the signal processing unit to collect environmental disturbance data during the uniform rotation process, and determine a compensation and correction scheme for the collected environmental disturbance data through a physical compensation model and a data-driven compensation model, so as to optimize the measured value through the supplementary correction scheme.

[0012] In a second aspect, an embodiment of the present application provides a measuring device for high-voltage DC electric field strength, which is provided with an optical fiber DC electric field sensor; the optical fiber DC electric field sensor at least includes a signal processing unit, an optical fiber voltage sensing head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the optical fiber voltage sensing head, and the rotating electrode is connected to a second signal input terminal provided in the optical fiber voltage sensing head; a resistor with a resistance value of 10 10 Ω order of magnitude is connected in parallel between the first signal input terminal and the second signal input terminal. The fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode; the optical fiber voltage sensing head is an optical fiber voltage sensing head based on the Pockels electro-optic effect principle; the device at least includes the following units:

[0013] A deployment unit for deploying the measuring device in a space to be measured;

[0014] A control unit for controlling the rotating electrode to rotate at a uniform speed so that the central distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory;

[0015] The optical fiber voltage sensing head is configured to collect an AC signal voltage generated by the alternating potential difference between the fixed electrode and the rotating electrode during the uniform rotation process;

[0016] A signal processing unit for performing numerical processing on the AC signal voltage to obtain a measured value of the high-voltage DC electric field strength;

[0017] A monitoring platform is provided outside the measuring device and connected to the signal processing unit, and is configured to collect environmental disturbance data during the uniform rotation process, and determine a compensation and correction scheme for the collected environmental disturbance data through a physical compensation model and a data-driven compensation model, so as to optimize the measured value through the supplementary correction scheme.

[0018] In a third aspect, an embodiment of the present application provides an electronic device, and the electronic device includes:

[0019] Optical fiber DC electric field sensor;

[0020] A memory for storing computer software programs;

[0021] A processor for reading and executing the computer software program, and then controlling the optical fiber DC electric field sensor to implement the method for measuring the high-voltage DC electric field intensity in the first aspect.

[0022] In the technical solution provided by the embodiment of the present application, it is applied to a measuring device provided with an optical fiber DC electric field sensor. Assume that the optical fiber DC electric field sensor at least includes a signal processing unit, an optical fiber voltage sensing head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the optical fiber voltage sensing head, and the rotating electrode is connected to a second signal input terminal provided in the optical fiber voltage sensing head; the fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode; the optical fiber voltage sensing head is an optical fiber voltage sensing head based on the Pockels electro-optic effect principle. In the technical solution of the present application, the measuring device is deployed in the space to be measured; the rotating electrode is controlled to rotate at a constant speed so that the central distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory; an AC signal voltage generated due to the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation is collected through the optical fiber voltage sensing head; the AC signal voltage is numerically processed by the signal processing unit to obtain a measured value of the high-voltage DC electric field intensity; a monitoring platform provided outside the measuring device and connected to the signal processing unit collects environmental disturbance data during the constant-speed rotation, and determines a compensation and correction scheme through a physical compensation model and a data-driven compensation model to optimize the measured value through the supplementary correction scheme.

[0023] The beneficial technical effects of the technical solution of the present application are as follows: A voltage-type sensor is formed by connecting a fixed electrode and a rotating electrode to an optical fiber voltage sensing head based on the Pockels electro-optic effect. Since there is no electrical connection to the ground and insulation is maintained, it can be placed in space, breaking through the limitation of traditional current-type sensors that can only measure the ground electric field, and realizing the measurement of high-voltage DC space electric fields. Moreover, by adopting a micro-structural design, the use of metal parts is greatly reduced, the volume and size are reduced, and the distortion effect on the measured electric field is greatly reduced. Compared with traditional measuring devices, it can provide more accurate and reliable measurement results in complex electric field environments. And by inferring environmental disturbance data through a physical compensation model and a data-driven compensation model, a supplementary correction scheme for optimizing the measured value is obtained, thereby further improving the accuracy of the measurement results. In short, the technical solution of the present application realizes the measurement of high-voltage DC space electric field intensity, which helps to improve the measurement accuracy and expand the measurement range. Description of the Drawings

[0024] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0025] Figure 1 is a schematic flow chart of a method for measuring the high-voltage DC electric field strength according to an embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of an optical fiber DC electric field sensor according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the effect of a method for measuring the high-voltage DC electric field strength according to an embodiment of the present application. Detailed implementation manners

[0028] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] In related technologies, the research on DC space electric fields mainly focuses on the measurement of space ion currents and the measurement of ground DC electric field strength, and the research direction is relatively limited.

[0031] Specifically, most of the research on DC space electric fields focuses on the measurement of space ion currents and the measurement of ground DC electric field intensity. To measure the ground DC electric field intensity, a vibrating electrode type capacitance sensor is mostly used. Its principle is as follows: the upper plate of the parallel plate capacitor vibrates up and down at a certain frequency driven by an electromagnetic coil, causing the capacitance between the upper and lower plates to change at the corresponding frequency. The vibrating electrode type capacitance sensor is placed at a position 0.5 m above the ground, and the lower plate is grounded through a sampling resistor. When the capacitance of the sensor changes at a certain frequency, an alternating current of the same frequency flows through the sampling resistor, so that the DC electric field signal is modulated into an alternating current signal, and an AC amplifier is used to process and measure the DC electric field signal. It can be understood that taking a DC electric field sensor or a sensor with a similar principle as a current type sensor, the lower plate needs to be grounded through a sampling resistor, which can only measure the ground DC electric field intensity, cannot measure the DC space electric field intensity under a converter station and a DC transmission line, nor can it measure the DC distribution voltage, and the measurement range is limited.

[0032] Therefore, to solve at least one of the above technical problems, the embodiments of the present application provide a method for measuring high-voltage DC electric field intensity and related devices.

[0033] Specifically, first, most of the traditional DC electric field measurement devices are current type sensors, such as the common vibrating electrode type capacitance sensor. Its lower plate needs to be grounded through a sampling resistor, which greatly limits the measurement range and can only measure the ground DC electric field intensity. In the present application, the fiber optic DC electric field sensor adopts an innovative design. A fixed electrode and a rotating electrode are respectively connected to the two signal input terminals of the fiber optic voltage sensing head based on the Pockels electro-optic effect principle to form a voltage type sensor. This design makes the overall sensor have no electrical connection to the ground and can be insulated from the ground and objects with ground potential. It breaks through the limitations of traditional sensors, enabling the sensor to be flexibly placed at any position in space, thereby realizing the precise measurement of high-voltage DC space electric fields, providing a powerful tool for studying complex space electric field distributions, and filling the gap in the measurement of space electric fields in related technologies.

[0034] Second, in the field of electric field measurement, the structural design of the sensor has a crucial impact on the measurement accuracy. Conventional measurement devices often cause significant distortion to the measured electric field during the measurement process due to their large size and excessive use of metal parts, resulting in relatively large deviations in the measurement results. The fiber optic DC electric field sensor of this application is ingeniously designed to achieve a miniature structure. By means of ingenious layout and material selection, the number of metal parts used is reduced, and at the same time, the volume and size of the sensor are controlled within an extremely small range. This design not only reduces the interference of the sensor itself on the electric field, but also minimizes the distortion effect on the measured electric field to the greatest extent. Through actual tests and verification, in various complex electric field environments, this sensor can provide accurate and reliable measurement results, providing high-precision data support for high-voltage DC electric field-related research and engineering applications, and helping to improve the research and application levels of the entire field.

[0035] Third, in the research of power systems and high-voltage electrical appliances, understanding the spatial DC voltage distribution or the DC voltage distribution of high-voltage electrical appliances is crucial for the safe operation and performance optimization of equipment. However, traditional measurement techniques can often only measure the electric field strength in isolation and cannot directly obtain voltage distribution information. The technical solution provided by the embodiments of this application can conveniently and quickly calculate the spatial DC voltage distribution or the DC voltage distribution of high-voltage electrical appliances through the accurate measurement results of the spatial electric field strength. This function organically combines the electric field strength measurement and the voltage distribution analysis, providing a one-stop solution for power engineers and researchers, greatly improving work efficiency, and helping to more deeply understand and optimize the operating characteristics of power systems and high-voltage electrical appliances, which has important practical significance for ensuring the safe and stable operation of power systems.

[0036] The technical solution of this application uses a fixed electrode and a rotating electrode connected to a fiber optic voltage sensing head based on the Pockels electro-optic effect to form a voltage-type sensor. Since there is no electrical connection to the ground and insulation is maintained, it can be placed in space, breaking through the limitation that traditional current-type sensors can only measure the ground electric field and realizing the measurement of high-voltage DC spatial electric fields. Moreover, by adopting a miniature structure design, the use of metal parts is greatly reduced, the volume and size are reduced, and the distortion effect on the measured electric field is greatly reduced. Compared with traditional measurement devices, it can provide more accurate and reliable measurement results in complex electric field environments. In short, the technical solution of this application realizes the measurement of high-voltage DC spatial electric field strength, which helps to improve the measurement accuracy and expand the measurement range.

[0037] The measurement scheme for high-voltage DC electric field strength provided by the embodiments of the present application can be executed by an electronic device, which can be a server, a server cluster, or a cloud server. The electronic device can also be a terminal device such as a mobile phone, a computer, a tablet computer, a wearable device, or a dedicated device (such as a dedicated terminal device with a measurement system for high-voltage DC electric field strength, etc.). In an alternative embodiment, a service program for executing the measurement scheme for high-voltage DC electric field strength can be installed on the electronic device.

[0038] Figure 1 It is a schematic diagram of a method for measuring high-voltage DC electric field strength provided by the embodiments of the present application. As Figure 1 shown, the method includes the following steps:

[0039] 101. Deploy the measurement device in the space to be measured;

[0040] 102. Control the rotating electrode to rotate at a constant speed, so that the center distance between the fixed electrode and the rotating electrode changes periodically along the rotation trajectory;

[0041] 103. Collect the AC signal voltage generated by the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation through the fiber optic voltage sensor head;

[0042] 104. Numerically process the AC signal voltage through the signal processing unit to obtain the measured value of the high-voltage DC electric field strength;

[0043] 105. Through a monitoring platform arranged outside the measurement device and connected to the signal processing unit, collect the environmental disturbance data during the constant-speed rotation, and determine a compensation and correction scheme through the physical compensation model and the data-driven compensation model, so as to optimize the measured value through the supplementary correction scheme.

[0044] In the embodiments of the present application, the fiber optic DC electric field sensor at least includes a signal processing unit, a fiber optic voltage sensor head, a fixed electrode, and a rotating electrode. Further optionally, the fixed electrode is connected to the first signal input terminal arranged in the fiber optic voltage sensor head, and the rotating electrode is connected to the second signal input terminal arranged in the fiber optic voltage sensor head. Further optionally, the fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode. Further optionally, the fiber optic voltage sensor head is a fiber optic voltage sensor head based on the Pockels electro-optic effect principle.

[0045] Further optionally, the rotating electrode is connected to the second signal input terminal through a metal spring piece. One side of the metal spring piece is fixedly connected to the second signal input terminal by welding, and the other side of the metal spring piece is slidably connected to the rotating electrode through a micro metal rotating shaft. Further optionally, a resistor with a resistance value of 10 10 Ω in the order of magnitude is connected in parallel between the first signal input terminal and the second signal input terminal.

[0046] Further optionally, the other end of the rotating electrode is connected to a micro motor through an insulating transmission shaft, and the micro motor is used to control the rotating electrode to perform a rotating motion.

[0047] Further optionally, two optical cables are arranged at the tail of the optical fiber voltage sensing head and connected to the signal processing unit.

[0048] Further optionally, the surface of the insulating component of the optical fiber voltage sensing head is treated with moisture-proof, and the space between the first signal input terminal and the second signal input terminal is potted with silicone rubber.

[0049] The above sensor structure and measurement principle are specifically introduced below:

[0050] In the embodiment of the present application, the core component of the optical fiber direct current electric field sensor is an optical fiber voltage sensing head based on the Pockels electro-optic effect principle. A fixed electrode and a rotating electrode are respectively connected to the two signal input terminals of the optical fiber voltage sensing head. The structural design and arrangement of these two electrodes are such that when the rotating electrode rotates, the center distance between the two will change periodically, and they are connected to the signal input terminal at the closest distance. The rotating electrode is driven by a micro motor with speed stabilization control. To reduce the interference to the measured electric field, the micro motor is far away from the rotating electrode, and the two are connected through a transmission shaft made of insulating material, while ensuring that the rotating electrode always maintains a stable electrical connection with the signal input terminal of the optical fiber voltage sensing head during the rotation process, so as to accurately realize the measurement function of the direct current electric field.

[0051] This optical fiber direct current electric field sensor mainly consists of a signal processing unit, an optical fiber voltage sensing head, a fixed electrode, a rotating electrode and other parts. Among them, the optical fiber voltage sensing head is the core component, which works based on the Pockels electro-optic effect principle. The Pockels electro-optic effect means that when an electric field acts on some crystals, their refractive index will change linearly, and then the characteristics of the light passing through the crystals (such as phase, polarization state, etc.) will change. Using this characteristic, the measurement of the electric field can be realized.

[0052] The fixed electrode is connected to the first signal input terminal of the fiber optic voltage sensor head, and the rotating electrode is connected to the second signal input terminal. The two are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode. This structural design enables the sensor to effectively measure the key layout of the electric field. When the rotating electrode is driven to rotate by a micro motor with speed stabilization control, the central distance between the fixed electrode and the rotating electrode changes periodically. For example, assuming the relevant parameter of the rotation radius of the rotating electrode is R, when the rotating electrode rotates, when it is at the highest position, the central distance from the fixed electrode is a certain value (such as 2R + h, where h is a specific spacing parameter), and at the lowest position, the distance is another value (such as h), and the central distance changes according to the law of (h + R + Rsinωt), ω = 2πf, where f is the rotation frequency.

[0053] Both the fixed electrode and the rotating electrode are connected to the signal input terminals of the fiber optic voltage sensor head at the closest distance to ensure the high efficiency of signal transmission. At the same time, the metal rotating shaft of the rotating electrode is connected to the signal input terminal of the fiber optic voltage sensor head through a metal spring piece to ensure that the rotating electrode always maintains a stable electrical connection with the signal input terminal during rotation, so that the alternating potential difference can be stably input into the fiber optic voltage sensor head.

[0054] A resistor with a resistance value of 20 GΩ is connected in parallel between the first signal input terminal and the second signal input terminal to prevent the accumulation of DC charges on the sensor electrodes and affect the measurement results.

[0055] The rotating electrode is driven by a micro motor with speed stabilization control. To reduce the influence on the electric field in the measured space, the micro motor is far away from the rotating electrode, and the two are connected by a transmission shaft made of insulating material. This not only ensures the stable rotation of the rotating electrode but also avoids the interference of the motor itself on the measured electric field and improves the measurement accuracy.

[0056] When the sensor is placed in the measured DC electric field space, as the rotating electrode rotates, an alternating potential difference is generated between the fixed electrode and the rotating electrode. This AC signal voltage is input into the fiber optic voltage sensor head based on the Pockels electro-optic effect principle. Due to the Pockels electro-optic effect, the refractive index of the electro-optic crystal in the fiber optic voltage sensor head changes linearly under the action of the electric field, resulting in changes in the phase, polarization state, etc. of the light passing through the crystal. After the optical signal is processed by the sensor head, it is transmitted to the signal processing unit and outputs an AC signal corresponding to the input AC signal. By analyzing the output signal (such as analyzing the characteristics of the signal frequency, amplitude, etc.), the intensity of the measured DC electric field can be calculated by inversion.

[0057] Therefore, through the unique electrode structure design and stable electrical connection, the signal generated by the electric field change can be accurately captured, and combined with the principle of Pockels electro-optical effect, a more accurate measurement of the DC electric field strength can be achieved. After verification, the measurement error is small (less than 3%) within a certain spatial field strength range (such as 0.3kV / cm-3.0kV / cm). Based on optical fiber and Pockels electro-optical effect, the sensor is less affected by electromagnetic interference and is suitable for use in complex electromagnetic environments (such as substations, near high-voltage transmission lines, etc.), and can work stably and reliably. Different from some sensors that can only measure ground electric fields, the optical fiber DC electric field sensor can be placed in different positions in space through insulating operating rods, etc., to achieve the measurement of DC space electric field strength, broadening the measurement range.

[0058] Figure 2 Taking the sensor structure shown as an example, a flat fixed electrode 4 and a flat rotating electrode 5 are respectively arranged on the two signal input terminals 2 and 3 of the optical fiber voltage sensor head 1, and the voltage sensor head 1 is an optical fiber voltage sensor head based on the principle of Pockels electro-optical effect. The rotating axis of the rotating electrode 5 is parallel to the fixed electrode 4 and is located on the vertical line of the center of the fixed electrode 4. When the measured DC electric field is E, and the rotating electrode 5 rotates at a uniform speed, the center distance between the fixed electrode 4 and the rotating electrode 5 changes periodically. The fixed electrode 4 is directly welded to the signal input terminal 2 of the optical fiber voltage sensor head 1 so that the distance between the two is closest. The metal rotating shaft of the rotating electrode 5 is connected to the signal input terminal 3 of the optical fiber voltage sensor head 1 through a metal spring sheet 8. The rotating electrode 5 is driven by a micro motor 6 with a steady speed control. In order to reduce the influence on the measured space electric field, the micro motor 6 is far away from the rotating electrode 5, and the micro motor 6 and the rotating electrode 5 are connected by an insulating transmission shaft 7. One side of the micro metal spring sheet 8 is welded to the signal input terminal 3 of the optical fiber voltage sensor head 1, and the other side is slidably connected to the micro metal shaft of the rotating electrode 5, which can ensure that the rotating electrode 5 always maintains a stable electrical connection with the signal input terminal 3 of the optical fiber voltage sensor head 1 during the rotation process. Two optical cables 9 are connected to the signal processing unit at the tail of the optical fiber voltage sensor head 1.

[0059] by Figure 2 Taking the sensor structure shown in the figure as an example, the working mode of the optical fiber DC electric field sensor is explained: to measure the DC electric field strength in a certain space, the sensor is placed in the measured space with an insulating operating rod, and the sensor is pressed Figure 1 The sensor is placed in the orientation shown. The fixed electrode size is 20*15*0.3mm, the rotating electrode size is 15*20*0.3mm, the rotating electrode shaft diameter is 2mm, and the fiber optic voltage sensor head size is 15*25*40mm. The surface of the insulating part of the fiber optic voltage sensor head is treated with moisture-proof treatment, and the two signal input terminals are potted with silicone rubber.

[0060] Assume that the rotational speed of the micro-motor 6 is 1200 revolutions per minute. Then, the center distance between the rotating electrode 5 and the fixed electrode 4 changes periodically at a frequency of f = 20 Hz: When the rotating electrode is at the highest position, the center distance between the rotating electrode and the fixed electrode is (2R + h). When the rotating electrode is at the lowest position, the distance between the rotating electrode and the fixed electrode is h. The center distance between the two electrodes changes according to the law of (h + R + Rsinωt), where ω = 2πf.

[0061] From the perspective of the measurement principle, using the Pockels electro-optic effect, when there is a DC electric field E in the measured space, the rotating electrode 5 rotates at a uniform speed, causing the center distance between the fixed electrode 4 and the rotating electrode 5 to change according to the law of (h + R + Rsinωt) (ω = 2πf, f is the rotation frequency). As a result, an alternating potential difference REsinωt is generated between the two electrodes. This AC signal voltage is input into the fiber optic voltage sensor head 1 based on the Pockels electro-optic effect. Due to the Pockels electro-optic effect, the refractive index of the electro-optic crystal changes linearly under the action of the electric field, resulting in changes in the phase, polarization state, etc. of the light passing through the crystal. After the optical signal is processed by the sensor head, an AC signal corresponding to the input AC signal is output in the signal processing unit. By analyzing this output signal, the intensity of the measured DC electric field can be deduced inversely.

[0062] Furthermore, based on the principle of the Pockels electro-optic effect, the fiber optic voltage sensor head is the core sensing component, which can convert the voltage signal into an optical pulsation signal. Its size is 15*25*40 mm, and the surface of the insulating component is moisture-proof treated. The two signal input terminals are potted with silicone rubber. The size of the fixed electrode 4 is 20*15*0.3 mm, and it is directly welded to the signal input terminal 2. The size of the rotating electrode 5 is 15*20*0.3 mm, and the diameter of the rotating shaft is 2 mm. The rotating shaft of the rotating electrode is parallel to the fixed electrode and on its central vertical line, and the distance between the two changes periodically as the rotating electrode rotates. The micro-motor 6 with speed stabilization control is used to drive the rotating electrode 5, and the rotational speed is 1200 revolutions per minute. The micro-motor 6 is connected to the rotating electrode 5 through the insulating transmission shaft 7 to reduce the influence on the measured electric field.

[0063] The following is a specific introduction to the principle and technical effects of steps 101 to 104:

[0064] In step 101, deploy the measurement device in the space to be measured.

[0065] In step 102, control the rotating electrode to rotate at a uniform speed so that the center distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory.

[0066] Specifically, according to the theory related to electric fields, the change in the distance between electrodes will affect the potential distribution between the electrodes. When the rotating electrode rotates at a constant speed, its central distance from the fixed electrode changes periodically, which will cause the capacitance between the two to change periodically. Under the action of the electric field, an alternating potential difference is generated, providing a basis for subsequent signal acquisition. In this way, by generating a periodically changing potential difference, an alternating signal source that can be detected is provided for the fiber optic voltage sensor head, enabling the sensor to convert the electric field information into an electrical signal that is easy to measure, facilitating the subsequent quantitative measurement of the electric field strength, and achieving an effective conversion from the electric field signal to the electrical signal.

[0067] In step 103, the fiber optic voltage sensor head is used to collect the AC signal voltage generated by the alternating potential difference between the fixed electrode and the rotating electrode during the uniform rotation process.

[0068] Specifically, the fiber optic voltage sensor head is based on the Pockels electro-optic effect principle. When a voltage acts on the sensor head, it will change the optical properties of the electro-optic crystal, resulting in changes in parameters such as the phase and intensity of light. Furthermore, the signal of the voltage change can be converted into a light pulsation signal, and then the light pulsation signal is converted into an AC voltage signal for collection through a corresponding detection device. Thus, by utilizing the high sensitivity and anti-interference ability of the fiber optic voltage sensor head, the AC signal voltage generated by the weak alternating potential difference between the electrodes can be accurately collected, accurately converting the DC electric field strength into a voltage signal that can be processed. And due to the characteristics of the optical fiber itself, the influence of external electromagnetic interference on signal acquisition can be effectively reduced, ensuring the authenticity and accuracy of the collected signal.

[0069] In step 104, the signal processing unit performs numerical processing on the AC signal voltage to obtain a measured value of the high-voltage DC electric field strength.

[0070] Specifically, the signal processing unit analyzes and calculates the collected AC signal voltage according to the theoretical relationship between the electric field strength and parameters such as the potential difference and distance between the electrodes, and conducts calibration in a standard uniform flat electric field. This step realizes the conversion of the collected electrical signal into a high-voltage DC electric field strength value, providing directly available data for practical applications, facilitating the staff to understand the electric field strength situation in the space to be measured, and providing accurate data support for research, monitoring, and equipment maintenance related to high-voltage DC electric fields.

[0071] Further optionally, a built-in reference electric field source (such as a micro standard electric field generator) can also be used to generate a calibration electric field with a known intensity, and combined with a deep learning model to automatically adjust the sensor head parameters (such as light intensity gain, phase offset) to ensure the optimal initial measurement state.

[0072] For example, the built-in micro standard electric field generator is started before the measurement begins. For example, based on a specific circuit design and electric field generation principle, it can generate a DC electric field with a precisely known intensity. Assuming the generated electric field intensity is E{ref}, its value may be set to a common standard field strength value, such as 1 kV / cm. This reference electric field is independent of the electric field environment in the space to be measured and forms a precisely controllable calibration electric field region near the sensing head. The generator is powered by an internal power supply module and uses a high-precision voltage control circuit to adjust the output electric field intensity, ensuring a high degree of stability and accuracy of the reference electric field intensity generated each time. The value of the generated electric field intensity can be viewed and confirmed through a digital display screen or a communication interface connected to an external device.

[0073] Thus, during the traditional measurement process, the light intensity gain and phase bias of the sensing head may drift due to environmental factors (such as temperature changes, component aging caused by long-term use, etc.), thereby affecting the measurement accuracy. By using the reference electric field source in combination with a deep learning model to automatically adjust these parameters, these drifts can be compensated in real time. For example, during the actual measurement of a high-voltage DC electric field, assume that due to a temperature increase, the light intensity gain of the sensing head decreases by 10%, resulting in a deviation in the measurement result. After automatic adjustment, the light intensity gain is accurately restored to the optimal value, reducing the measurement error from the original ±5% to within ±1%, greatly improving the measurement accuracy.

[0074] 105, by means of a monitoring platform arranged outside the measurement device and connected to the signal processing unit, collect environmental disturbance data during the uniform rotation process, and determine a compensation and correction scheme for the collected environmental disturbance data through a physical compensation model and a data-driven compensation model, so as to optimize the measurement value through the supplementary correction scheme.

[0075] Step 105 specifically collects environmental disturbance data through a monitoring platform and determines a compensation and correction scheme. First, a distributed sensor network is deployed in the area 0.5 - 10 meters outside the measuring device. The temperature and humidity gradient sensors are used to monitor the temperature from -20°C to 80°C and the humidity from 0% to 100%RH. The vibration and attitude sensors collect the vibration amplitude from 0.1 - 1000Hz and the tilt angle. The electromagnetic interference monitoring unit identifies the radio frequency interference from 10kHz to 6GHz and the 50 / 60Hz power frequency magnetic field. The air pressure and wind speed sensors obtain the air pressure and wind speed data, which are used to correct the influence of the air dielectric constant on the electric field. At the same time, the IEEE 1588 precision clock protocol is used to ensure that the time stamp error between the sensor data and the measurement signal is less than 1 microsecond. And a three-dimensional disturbance field model with a fixed electrode as the origin is constructed through a space coordinate system transformation algorithm, and the gradient distribution of each disturbance parameter in the electrode space is output. Then, the original data is preprocessed. The wavelet packet transform is used to reduce the vibration signal noise and extract the energy characteristics of a specific frequency band. The fast Fourier transform is performed on the electromagnetic interference signal to obtain the frequency domain characteristics. The sliding average filter with a 30-second window is used for the temperature and humidity data to remove the high-frequency noise.

[0076] When determining the compensation and correction scheme, in terms of physical model compensation, for temperature disturbance, based on the Pockels effect temperature coefficient, the refractive index of the electro-optic crystal at the real-time temperature is calculated through a formula, and it is compared with the reference refractive index at 25°C to obtain the refractive index correction amount to compensate for the phase drift of the fiber optic voltage sensor head. For vibration disturbance, according to the relationship formula between the electrode parallelism deviation and the amplitude of the alternating potential difference, the attitude sensor data is used to calculate the angle deviation, and then the signal amplitude is corrected. For data-driven model compensation, a convolutional long short-term memory network is used to construct a multi-input single-output model. The 12-dimensional disturbance characteristics including temperature, humidity, vibration, electromagnetic interference, etc. are used as inputs, and the predicted value of the measurement error is output. The model is trained with more than 2000 sets of historical calibration data to make its prediction accuracy reach ±0.3% of the full scale on the test set. When generating dynamic compensation parameters, when the temperature change rate exceeds 1°C per minute, the physical model is preferentially used for immediate correction. When the vibration acceleration exceeds 0.5g, the convolutional long short-term memory network model is started to predict the dynamic error. Finally, by combining the predicted error rate of the data-driven model and the environmental influence rate calculated by the physical model, the corrected measurement value is obtained through a formula.

[0077] During the implementation stage of the compensation and correction scheme, the initialization calibration is to collect 72-hour reference data of the measurement device in a standard undisturbed environment, establish a signal feature library in the zero-disturbance state, and inject single or composite disturbances in a controllable disturbance environment to obtain the mapping relationship between the disturbance amplitude and the measurement error, which is used to train the data-driven model and calibrate the parameters of the physical model. During real-time compensation, the monitoring platform collects disturbance data at a frequency of 100 Hz, and after spatio-temporal registration, transmits it to the signal processing unit through a 5G or optical fiber communication link (with a time delay less than 10 ms). The signal processing unit uses the physical model for forward compensation for slow-varying disturbances such as temperature, humidity, and air pressure to correct the electro-optic effect coefficient of the fiber optic voltage sensor head. For transient disturbances such as vibration and sudden electromagnetic pulses, the data-driven model is enabled for backward correction, and the time-frequency domain reconstruction of the collected AC signal voltage is performed, and the correction effect evaluation value is fed back to the monitoring platform to form a closed-loop control to dynamically optimize the compensation algorithm parameters. The long-term drift calibration is carried out at zero o'clock every day. The monitoring platform uses the built-in standard electric field source to generate three levels of standard electric fields of 10 kV / m, 50 kV / m, and 100 kV / m to verify the drift amount of the measurement device. If the drift rate exceeds 1%, the disturbance data of the nearest 7 days is automatically retrieved, and the correlation relationship between the environmental factors and the drift amount is updated by least squares fitting to update the compensation model parameters. If the drift rate exceeds the tolerance for 3 consecutive calibrations, the hardware self-check process is triggered to check the key indicators such as the electrode parallelism, the deformation of the spring piece, and the rotational speed stability of the motor, locate the cause of the drift, and start the redundant module switching. Through the above process, the collaborative work of the physical compensation model and the data-driven compensation model is realized, effectively reducing the influence of environmental disturbances on the measurement of the high-voltage DC electric field intensity, reducing the measurement uncertainty from ±3% of the traditional scheme to ±0.8%, and significantly improving the accuracy and reliability of the measurement.

[0078] Traditional sensor calibration methods usually require professional technicians to use complex calibration equipment and perform manual calibration according to strict procedures, which is not only costly but also time-consuming. However, this scheme simplifies the calibration process through an automatic calibration method with a built-in reference electric field source and a deep learning model. For example, in the past, it might take technicians several hours to comprehensively calibrate a sensor, and calibration equipment worth tens of thousands of yuan was required. Now, through the automatic calibration mechanism, the sensor can complete self-calibration within a few minutes before each measurement, without the need for additional professional equipment and a large amount of manpower, significantly reducing the calibration cost and time.

[0079] As an alternative embodiment, in 102, control the rotary electrode to rotate at a constant speed so that the center distance between the fixed electrode and the rotary electrode changes periodically along with the rotation trajectory. Then, through the monitoring platform, use an image acquisition device or other data acquisition devices arranged outside the measuring device to acquire the deformation data of the micro motor and the metal spring piece before or after the measurement. Based on the deformation data, use a parameter simulation model to predict the rotational speed fluctuation of the micro motor and the contact resistance fluctuation of the metal spring piece. Generate real-time warning information according to the rotational speed fluctuation and the contact resistance fluctuation. Through the real-time warning information, optimize the control parameters of the rotary electrode, and / or prompt the user to replace the components with potential abnormalities in the fiber optic DC electric field sensor to further improve the measurement accuracy of the fiber optic DC electric field sensor.

[0080] Exemplarily, for the micro motor and the metal spring piece of the fiber optic DC electric field sensor, install a high-definition micro camera or other measuring devices in the monitoring platform to take pictures of the micro motor and the metal spring piece to obtain their deformation data. For example, the camera can clearly capture the dynamic images of the rotating parts of the micro motor and the contact part between the metal spring piece and the rotary electrode shaft.

[0081] Furthermore, establish a dedicated parameter simulation model, which is trained based on a deep learning algorithm (such as a convolutional neural network). Before the formal measurement, outside the measurement space, pre-detect the measuring device. During the measurement process, control the rotary electrode to rotate to simulate the formal measurement process and acquire the deformation data during the rotation. Then, after simulating the formal measurement, input the acquired deformation data into the model. The model analyzes the rotation details of the micro motor in the image (such as the displacement and speed change of the rotating parts) to predict the rotational speed fluctuation of the micro motor. For the metal spring piece, the model predicts its contact resistance fluctuation by observing the image features of the contact part between the spring piece and the shaft (such as the change in the contact area and whether there are wear marks). For example, when the model detects an abnormal change in the displacement of the rotating parts of the micro motor, it predicts that its rotational speed may fluctuate; when it is found that the contact area between the metal spring piece and the shaft becomes smaller or there are obvious signs of wear, it predicts that its contact resistance may increase.

[0082] Generate corresponding real-time warning information according to the prediction results of the parameter simulation model. If it is predicted that the rotational speed fluctuation of the micro motor exceeds the set threshold (such as ±5% of the normal rotational speed), a warning message of "abnormal rotational speed fluctuation of the micro motor" is generated; if it is predicted that the contact resistance fluctuation of the metal spring piece exceeds the specified range (such as the contact resistance increasing by more than 20% of the initial value), a warning message of "abnormal contact resistance fluctuation of the metal spring piece" is generated. These warning messages can be displayed on the display screen of the sensor or sent to the user's terminal device (such as mobile phone, computer) through the wireless communication module.

[0083] When receiving the warning information of abnormal rotational speed fluctuation of the micro motor, the system automatically analyzes the cause of the fluctuation and attempts to optimize the control parameters of the rotating electrode. For example, if it is found that the rotational speed fluctuation is caused by unstable power supply voltage, the system can automatically adjust the output of the power supply voltage to stabilize it within a suitable range, so that the micro motor resumes a stable rotational speed. If it is predicted that the contact resistance fluctuation of the metal spring piece is abnormal and reaches the degree that needs to be replaced, the system will prompt the user to replace the metal spring piece in the fiber optic DC electric field sensor to ensure the measurement accuracy. The user can perform the replacement operation in a timely manner according to the prompt information.

[0084] Thus, by real-time monitoring the rotational speed fluctuation of the micro motor and the contact resistance fluctuation of the metal spring piece and taking corresponding measures in a timely manner, it is possible to effectively avoid measurement errors caused by the performance changes of these components. For example, when the rotational speed of the micro motor is unstable, it may cause the center distance between the fixed electrode and the rotating electrode to change irregularly, thus affecting the generation of the alternating potential difference and resulting in inaccurate measurement results. After optimizing the control parameters to restore the rotational speed stability, the measurement accuracy is significantly improved, and the measurement error can be reduced to about half of the original.

[0085] In addition, potential problems of the micro motor and the metal spring piece can be discovered and handled in a timely manner, which can extend the service life of the fiber optic DC electric field sensor and enhance the reliability of the equipment. For example, detecting the wear of the metal spring piece in advance and replacing it in a timely manner can avoid sensor failures caused by poor contact of the spring piece, reduce the number of equipment repairs and downtime, and improve the operation efficiency of the equipment. This embodiment realizes the intelligent monitoring and management of the key components of the fiber optic DC electric field sensor. The user can timely understand the operating state of the sensor through the real-time warning information, without the need for frequent manual inspections and maintenance, reducing the labor cost and maintenance difficulty. At the same time, the function of the system to automatically optimize the control parameters also reflects the intelligent level of the equipment and improves the automation degree of the measurement process.

[0086] In the embodiment of the present application, the measured value output by the fiber optic DC electric field sensor can be referred to Figure 3As shown. Assume that the local electric field in the space to be measured is a uniform electric field, the DC electric field strength is E (V / cm), and the alternating potential difference between the two electrodes is REsinωt. This is equivalent to inputting an AC signal voltage of REsinωt to the fiber optic voltage sensor head based on the Pockels electro-optic effect principle, and a corresponding AC signal will be output in its signal processing unit. In Figure 3 shows the signal waveform output when actually measuring a DC space electric field, Figure 3 where f = 15.4 Hz. The fiber optic DC electric field sensor is calibrated with a parallel plate uniform electric field, and the measurement error is less than 3% when the space field strength is 0.3 kV / cm - 3.0 kV / cm.

[0087] In the embodiment of the present application, a voltage-type sensor is formed by connecting a fixed electrode and a rotating electrode to a fiber optic voltage sensor head based on the Pockels electro-optic effect principle. Since there is no electrical connection to the ground and insulation is maintained, it can be placed in space, breaking through the limitation that traditional current-type sensors can only measure the ground electric field and realizing the measurement of high-voltage DC space electric fields. Moreover, by adopting a microstructural design, the use of metal parts is greatly reduced, the volume and size are reduced, and the distortion effect on the measured electric field is greatly reduced. Compared with traditional measurement devices, it can provide more accurate and reliable measurement results in complex electric field environments. In short, the technical solution of the present application realizes the measurement of high-voltage DC space electric field strength, which helps to improve the measurement accuracy and expand the measurement range.

[0088] In another embodiment of the present application, a measurement device for high-voltage DC electric field strength is further provided, which is provided with a fiber optic DC electric field sensor; the fiber optic DC electric field sensor at least includes a signal processing unit, a fiber optic voltage sensor head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the fiber optic voltage sensor head, and the rotating electrode is connected to a second signal input terminal provided in the fiber optic voltage sensor head; the fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode; the fiber optic voltage sensor head is a fiber optic voltage sensor head based on the Pockels electro-optic effect principle; the device at least includes the following units:

[0089] A deployment unit for deploying the measurement device in the space to be measured;

[0090] A control unit for controlling the rotating electrode to rotate at a constant speed so that the central distance between the fixed electrode and the rotating electrode changes periodically along the rotation trajectory;

[0091] The fiber optic voltage sensor head is used to collect the AC signal voltage generated due to the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation process;

[0092] A signal processing unit for numerically processing the AC signal voltage to obtain a measured value of the high-voltage DC electric field strength;

[0093] A monitoring platform, which is arranged outside the measuring device and connected to the signal processing unit, for collecting environmental disturbance data during the uniform rotation process, and determining a compensation and correction scheme through a physical compensation model and a data-driven compensation model for the collected environmental disturbance data, so as to optimize the measured value through the supplementary correction scheme.

[0094] Further optionally, the rotating electrode is connected to the second signal input terminal through a metal spring piece;

[0095] One side of the metal spring piece is fixedly connected to the second signal input terminal by welding, and the other side of the metal spring piece is slidably connected to the rotating electrode through a micro metal rotating shaft.

[0096] Further optionally, the other end of the rotating electrode is connected to a micro motor through an insulating transmission shaft, and the micro motor is used to control the rotating electrode to perform a rotating motion.

[0097] Further optionally, the micro motor is provided with a speed stabilization control unit.

[0098] Further optionally, when the control unit controls the rotating electrode to rotate at a constant speed, it is specifically used for:

[0099] When the rotating electrode is driven to rotate by the micro motor, using the speed-torque double closed-loop speed stabilization control unit provided in the micro motor, the speed is adjusted according to the load torque and environmental disturbance, so that the center distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory.

[0100] Further optionally, two optical cables are arranged at the tail of the optical fiber voltage sensing head and connected to the signal processing unit.

[0101] Further optionally, the surface of the insulating component of the optical fiber voltage sensing head is subjected to moisture-proof treatment, and the first signal input terminal and the second signal input terminal are potted with silicone rubber.

[0102] Further optionally, a resistor with a resistance value of about 10 10 Ω is connected in parallel between the first signal input terminal and the second signal input terminal.

[0103] In the embodiments of the present application, through the above-mentioned device, a voltage sensor is formed by connecting a fixed electrode and a rotating electrode to a fiber optic voltage sensor based on the Pockels electro-optic effect. Since there is no electrical connection to the ground and insulation is maintained, it can be placed in space, breaking through the limitation of traditional current sensors that can only measure the ground electric field and realizing the measurement of high-voltage DC space electric fields. Moreover, by adopting a micro-structural design, the use of metal parts is greatly reduced, the volume and size are reduced, and the distortion effect on the measured electric field is greatly reduced. Compared with traditional measurement devices, it can provide more accurate and reliable measurement results in complex electric field environments.

[0104] In another embodiment of the present application, an electronic device is further provided, including: a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0105] The memory is used to store a computer program;

[0106] The processor is used to implement the method for measuring the high-voltage DC electric field intensity described in the method embodiments when executing the program stored in the memory.

[0107] The memory may include a random access memory (RAM), or may also include a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located far from the aforementioned processor.

[0108] The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0109] Correspondingly, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, and when the computer program is executed, it can implement the steps executable by the electronic device in the above method embodiments.

Claims

1. A method for measuring the high-voltage DC electric field strength, characterized in that, The method is applied to a measuring device provided with an optical fiber DC electric field sensor. The optical fiber DC electric field sensor at least includes a signal processing unit, an optical fiber voltage sensing head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the optical fiber voltage sensing head, and the rotating electrode is connected to a second signal input terminal provided in the optical fiber voltage sensing head. The fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode. The optical fiber voltage sensing head is an optical fiber voltage sensing head based on the Pockels electro-optic effect principle. The method includes: Deploy the measuring device in the space to be measured. Control the rotating electrode to rotate at a constant speed, so that the central distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory. Collect, through the optical fiber voltage sensing head, the AC signal voltage generated due to the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation process. Perform numerical processing on the AC signal voltage through the signal processing unit to obtain the measured value of the high-voltage DC electric field intensity. Through a monitoring platform provided outside the measuring device and connected to the signal processing unit, collect the environmental disturbance data during the constant-speed rotation process, and determine a compensation and correction scheme through a physical compensation model and a data-driven compensation model for the collected environmental disturbance data, so as to optimize the measured value through the supplementary correction scheme.

2. The method for measuring the high-voltage DC electric field strength according to claim 1, characterized in that The rotating electrode is connected to the second signal input terminal through a metal spring piece. One side of the metal spring piece and the second signal input terminal are fixedly connected by welding, and the other side of the metal spring piece and the rotating electrode are slidably connected through a micro metal rotating shaft.

3. The method for measuring the high-voltage DC electric field strength according to claim 2, characterized in that The other end of the rotating electrode is connected to a micro motor through an insulating transmission shaft, and the micro motor is used to control the rotating electrode to perform a rotating motion.

4. The method for measuring the high-voltage DC electric field strength according to claim 3, wherein The micro motor is provided with a constant-speed control unit.

5. The method for measuring the high-voltage DC electric field strength according to claim 4, characterized in that, The controlling the rotating electrode to rotate at a constant speed includes: When the rotating electrode is driven to rotate by the micro motor, use the speed-torque double-closed-loop constant-speed control unit provided in the micro motor to adjust the speed according to the load torque and environmental disturbance, so that the central distance between the fixed electrode and the rotating electrode changes periodically along with the rotation trajectory.

6. The method for measuring the high-voltage DC electric field strength according to claim 1, characterized in that, Two optical cables are provided at the tail of the optical fiber voltage sensing head and are connected to the signal processing unit.

7. The method for measuring the high-voltage DC electric field strength according to claim 1, characterized in that, The surface of the insulating component of the optical fiber voltage sensing head is treated with moisture-proofing, and the space between the first signal input terminal and the second signal input terminal is potted with silicone rubber.

8. The method for measuring the high-voltage direct-current electric field strength according to claim 1, characterized in that A resistor with a resistance value on the order of 10 10 Ω is connected in parallel between the first signal input terminal and the second signal input terminal.

9. A measuring device for the intensity of a high-voltage direct current electric field, characterized in that, A fiber optic DC electric field sensor is provided; the fiber optic DC electric field sensor at least includes a signal processing unit, a fiber optic voltage sensing head, a fixed electrode, and a rotating electrode. The fixed electrode is connected to a first signal input terminal provided in the fiber optic voltage sensing head, and the rotating electrode is connected to a second signal input terminal provided in the fiber optic voltage sensing head; the fixed electrode and the rotating electrode are parallel to each other, and the rotating electrode is located on the central vertical line of the fixed electrode; the fiber optic voltage sensing head is a fiber optic voltage sensing head based on the Pockels electro-optic effect principle; the device at least includes the following units: A deployment unit for deploying the measuring device in a space to be measured; A control unit for controlling the rotating electrode to rotate at a constant speed so that the central distance between the fixed electrode and the rotating electrode changes periodically along the rotation trajectory; The fiber optic voltage sensing head for collecting an AC signal voltage generated by the alternating potential difference between the fixed electrode and the rotating electrode during the constant-speed rotation; A signal processing unit for numerically processing the AC signal voltage to obtain a measured value of the high-voltage DC electric field intensity; A monitoring platform is provided outside the measuring device and is connected to the signal processing unit, for collecting environmental disturbance data during the constant-speed rotation, and determining a compensation and correction scheme through a physical compensation model and a data-driven compensation model for the collected environmental disturbance data, so as to optimize the measured value through the supplementary correction scheme.

10. An electronic device, characterized in that, including: A fiber optic DC electric field sensor; A memory for storing computer software programs; A processor for reading and executing the computer software programs, and further controlling the fiber optic DC electric field sensor to implement the method for measuring the high-voltage DC electric field intensity according to any one of claims 1-7.

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