Circuit breaker measurement system and method

Abstract

This application relates to a circuit breaker measurement system and method. The system includes an optical electric field detection device, an electrical information detection device, and a control device. The control device is connected to the optical electric field detection device and the electrical information detection device. The optical electric field detection device is used to collect tangential electric field components at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the multi-break vacuum circuit breaker is under impulse voltage and is not in contact with the multi-break vacuum circuit breaker, and to collect normal electric field components at multiple breaks in the multi-break vacuum circuit breaker. The electrical information detection device is used to collect electrical information of the multi-break vacuum circuit breaker. The control device is used to acquire the electrical information, tangential electric field components, and normal electric field components, and to determine the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, tangential electric field components, and normal electric field components. Using this system can improve the measurement effect.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a circuit breaker measurement system and method. Background Technology

[0002] As power systems develop towards higher voltage and larger capacity, multi-break vacuum circuit breakers are widely used in ultra-high voltage power transmission, smart grids, and other fields due to their excellent insulation performance and breaking capacity. However, accurate monitoring of their breakdown state remains a technical bottleneck in the industry.

[0003] Traditional detection techniques mainly rely on contact sensors or partial discharge detection. These methods require direct installation inside the circuit breaker, and contact sensors can alter the original electric field distribution of the circuit breaker, resulting in poor measurement performance. Summary of the Invention

[0004] Therefore, it is necessary to provide a circuit breaker measurement system and method that can improve the measurement effect in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a circuit breaker measurement system, the system comprising an optical electric field detection device, an electrical information detection device, and a control device; the control device is connected to the optical electric field detection device and the electrical information detection device;

[0006] The optical electric field detection device is used to collect tangential electric field components at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the multi-break vacuum circuit breaker is subjected to impulse voltage and is not in contact with the multi-break vacuum circuit breaker, and to collect normal electric field components at multiple breaks in the multi-break vacuum circuit breaker.

[0007] The electrical information detection device is used to collect electrical information of the multi-break vacuum circuit breaker;

[0008] The control device is used to acquire the electrical information, the tangential electric field component, and the normal electric field component, and to determine the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, the tangential electric field component, and the normal electric field component.

[0009] In one embodiment, the optical electric field detection device specifically acquires the tangential electric field component when it is parallel to the axial direction of the multi-break vacuum circuit breaker, and acquires the normal electric field component when it is perpendicular to the axial direction.

[0010] In one embodiment, the optical electric field probe in the optical electric field detection device is specifically an electro-electric field measurement probe based on the Pockels effect.

[0011] In one embodiment, the electric field sensing element in the electro-optical field measurement probe is Electro-optic crystal.

[0012] In one embodiment, the distance between the optical electric field detection device and the plurality of acquisition points ranges from 1mm to 2mm.

[0013] In one embodiment, the spacing between the plurality of collection points ranges from 5mm to 10mm.

[0014] In one embodiment, the distance between the optical electric field detection device and the plurality of breaks is in the range of 1mm-2mm.

[0015] In one embodiment, the control device is specifically used for:

[0016] Determine the abrupt change frequencies corresponding to the electrical information, the tangential electric field component, and the normal electric field component, respectively;

[0017] Based on the aforementioned mutation frequencies, the breakdown state of the multi-break vacuum circuit breaker is determined.

[0018] Secondly, this application also provides a circuit breaker measurement method, the method comprising:

[0019] Acquire electrical information, tangential electric field components, and normal electric field components for multi-break vacuum circuit breakers;

[0020] The tangential electric field component is acquired by an optical electric field detection device at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the device is under impulse voltage and is not in contact with the multi-break vacuum circuit breaker; the normal electric field component is acquired by the optical electric field detection device at multiple breaks in the multi-break vacuum circuit breaker; and the electrical information is acquired by the electrical information detection device at the multi-break vacuum circuit breaker.

[0021] Based on the electrical information, the tangential electric field component, and the normal electric field component, the breakdown state of the multi-break vacuum circuit breaker is determined.

[0022] In one embodiment, determining the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, the tangential electric field component, and the normal electric field component includes:

[0023] Determine the abrupt change frequencies corresponding to the electrical information, the tangential electric field component, and the normal electric field component, respectively;

[0024] Based on the aforementioned mutation frequencies, the breakdown state of the multi-break vacuum circuit breaker is determined.

[0025] Thirdly, this application also provides a circuit breaker measuring device, comprising:

[0026] The information acquisition module is used to acquire electrical information, tangential electric field components, and normal electric field components collected for multi-break vacuum circuit breakers.

[0027] The tangential electric field component is acquired by an optical electric field detection device at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the device is under impulse voltage and is not in contact with the multi-break vacuum circuit breaker; the normal electric field component is acquired by the optical electric field detection device at multiple breaks in the multi-break vacuum circuit breaker; and the electrical information is acquired by the electrical information detection device at the multi-break vacuum circuit breaker.

[0028] The breakdown state determination module is used to determine the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, the tangential electric field component, and the normal electric field component.

[0029] Fourthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0030] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method described above.

[0031] Sixthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the method described above.

[0032] The aforementioned circuit breaker measurement system and method achieve non-contact monitoring through optical electric field detection equipment, avoiding interference from contact sensors on the circuit breaker's electric field distribution and ensuring the original insulation performance of the equipment. Simultaneously, this equipment can synchronously acquire the tangential electric field component of the break surface and the internal normal electric field component. Combined with electrical information acquired by electrical information detection equipment, the control equipment can comprehensively analyze the correlation between multi-dimensional electric field data and electrical characteristics, thereby accurately identifying early electric field distortion characteristics of break breakdown and overcoming the limitations of traditional methods that can only detect after the fact. Furthermore, the system, through non-contact optical sensing technology, can adapt to long-term stable operation under high-voltage environments, ultimately achieving accurate measurement of the breakdown state of multi-break vacuum circuit breakers, thus improving measurement performance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the circuit breaker measurement system in one embodiment;

[0035] Figure 2 This is a schematic diagram of the measurement method of the optical electric field probe in one embodiment;

[0036] Figure 3 This is a schematic diagram illustrating the spacing range between multiple data collection points in one embodiment.

[0037] Figure 4 This is a comparison chart of the measured and simulated electric field results of the outdoor surface of a double-break vacuum arc extinguisher in one embodiment.

[0038] Figure 5 This is a diagram showing the measurement results of the connection potential and normal electric field in one embodiment;

[0039] Figure 6 This is a typical waveform diagram in one embodiment where none of the fracture surfaces have broken down;

[0040] Figure 7 This is a typical waveform diagram of partial fracture breakdown in one embodiment;

[0041] Figure 8 This is a typical waveform diagram of sequential breakdown of each fracture surface in one embodiment;

[0042] Figure 9 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0043] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0046] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0047] As described in the background section, with the development of power systems towards higher voltage and larger capacity, multi-break vacuum circuit breakers have been widely used in ultra-high voltage power transmission, smart grids, and other fields due to their excellent insulation performance and breaking capacity. However, accurate monitoring of their breakdown state remains a technical bottleneck in the industry.

[0048] Traditional detection techniques mainly rely on contact sensors or partial discharge detection. These methods require direct installation inside the circuit breaker, and contact sensors can alter the original electric field distribution of the circuit breaker, resulting in poor measurement performance.

[0049] For the reasons mentioned above, such as Figure 1 As shown, a circuit breaker measurement system is proposed, including an optical electric field detection device 10, an electrical information detection device 20, and a control device 30. The control device 30 is connected to the optical electric field detection device 10 and the electrical information detection device 20. The optical electric field detection device 10 is used to collect tangential electric field components at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the multi-break vacuum circuit breaker is under impulse voltage and is not in contact with the multi-break vacuum circuit breaker, and to collect normal electric field components at multiple breaks in the multi-break vacuum circuit breaker. The electrical information detection device 20 is used to collect electrical information of the multi-break vacuum circuit breaker. The control device 30 is used to acquire electrical information, tangential electric field components, and normal electric field components, and to determine the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, tangential electric field components, and normal electric field components.

[0050] The optical electric field detection device 10 is a device that uses optical principles to measure electric fields. When an external electric field is applied to the electro-optic crystal in the optical electric field detection device 10, birefringence occurs inside the crystal, causing a phase change in the polarization of the incident polarized light as it propagates through the crystal. The optical electric field detection device 10 detects this phase change and converts the optical signal into an electrical signal via a photoelectric conversion device, thereby obtaining an electric field measurement signal corresponding to the applied electric field strength. This detection method has advantages such as non-contact operation, high sensitivity, and resistance to electromagnetic interference, and can accurately measure the electric field without interfering with the normal operation of the circuit breaker. The electrical information detection device 20 is mainly used to collect electrical parameters of the multi-break vacuum circuit breaker, such as voltage, current, and power. This electrical information reflects the operating status and load condition of the circuit breaker in the power system and is an important basis for judging whether the circuit breaker is operating normally and predicting potential faults. The control device 30 is the core of the circuit breaker measurement system, and it is responsible for coordinating and managing the operation of the optical electric field detection device 10 and the electrical information detection device 20. It receives data from these two devices, processes and analyzes the data, determines the breakdown state of the circuit breaker's contacts based on preset algorithms and judgment criteria, and can issue corresponding control commands or alarm signals. The tangential electric field component refers to the electric field intensity component along the surface direction of the multi-break vacuum circuit breaker. During circuit breaker operation, the distribution of the surface electric field has a significant impact on its insulation performance and breakdown characteristics. Measuring the tangential electric field component helps to understand whether the electric field distribution on the circuit breaker surface is uniform and whether there is a local over-electric field. The normal electric field component is the electric field intensity component perpendicular to the surface direction of the multi-break vacuum circuit breaker. The normal electric field component is directly related to the electric field intensity at the circuit breaker's contacts. When the normal electric field component exceeds a certain threshold, it may lead to contact breakdown. Therefore, accurate measurement of the normal electric field component is crucial for judging the circuit breaker's breakdown state. Impulse voltage is a transient voltage that changes rapidly over a short period. In power systems, impulse voltage may be caused by lightning strikes, switching operations, etc. When a multi-break vacuum circuit breaker is subjected to impulse voltage, the electric field distribution inside it will change drastically, which can easily lead to faults such as break-through. Therefore, it is of great significance to study the electric field distribution and breakdown characteristics of circuit breakers under impulse voltage.

[0051] Specifically, the circuit breaker measurement system in this embodiment comprises three main parts: an optical electric field detection device 10, an electrical information detection device 20, and a control device 30. The optical electric field detection device 10 operates under the special condition of a multi-break vacuum circuit breaker being subjected to impulse voltage without contact. This non-contact measurement method avoids interference with the electric field distribution that may occur with traditional contact sensors, while also ensuring the safety of the measurement personnel. It collects tangential electric field components at multiple sampling points on the circuit breaker surface. Through multi-point sampling, a more comprehensive understanding of the electric field distribution on the circuit breaker surface can be obtained, and potential local electric field anomalies can be detected. Simultaneously, the device also collects normal electric field components at multiple breaks in the circuit breaker, directly acquiring key electric field information at the breaks. The electrical information detection device 20 is responsible for collecting the electrical information of the circuit breaker. This information complements the electric field components, providing rich data for a comprehensive assessment of the circuit breaker's operating status. The control device 30, acting as the system's central hub, comprehensively processes and analyzes the acquired electrical information, tangential electric field components, and normal electric field components. Since potential changes at the break-in connection point cause changes in the surrounding electric field distribution, the change in the normal electric field at this location can characterize the potential change process at the break-in connection point. When a multi-break vacuum circuit breaker experiences breakdown or partial discharge under voltage, the voltage distribution between the breaks changes, leading to potential changes at the connection point and further causing changes in the surrounding electric field. By measuring the normal electric field change at the connection point in real time, and combining this with the measurement results of the total voltage across the multi-break vacuum circuit breaker and the circuit current, the voltage, electric field, and current change characteristics of the multi-break vacuum circuit breaker under impulse voltage can be obtained, thereby enabling the determination of its breakdown characteristics and breakdown sequence.

[0052] The aforementioned circuit breaker measurement system achieves non-contact monitoring through optical electric field detection equipment, avoiding interference from contact sensors on the circuit breaker's electric field distribution and ensuring the original insulation performance of the equipment. Simultaneously, this equipment can synchronously acquire the tangential electric field component of the break surface and the internal normal electric field component. Combined with electrical information acquired by electrical information detection equipment, the control equipment can comprehensively analyze the correlation between multi-dimensional electric field data and electrical characteristics, thereby accurately identifying early electric field distortion characteristics of break breakdown and overcoming the limitations of traditional methods that can only detect after the fact. Furthermore, through non-contact optical sensing technology, the system can adapt to long-term stable operation under high-voltage environments, ultimately achieving accurate measurement of the breakdown state of multi-break vacuum circuit breakers, thus improving measurement performance.

[0053] In one embodiment, the optical electric field detection device specifically acquires the tangential electric field component when parallel to the axis of the multi-break vacuum circuit breaker, and the normal electric field component when perpendicular to the axis.

[0054] For multi-break vacuum circuit breakers, the axial direction refers to the longitudinal direction of the break arrangement, which is the length direction of the overall circuit breaker structure. The electric field distribution and changes in this direction have a significant impact on the performance and breakdown characteristics of the circuit breaker. In this embodiment, the optical electric field detection device is parallel to the axial direction of the circuit breaker, meaning that the detection direction of the device is consistent with the axial direction, used to collect electric field components in a specific direction. When the optical electric field detection device is perpendicular to the axial direction of the circuit breaker, its detection direction forms a 90-degree angle with the axial direction, and the electric field component perpendicular to the axial direction is collected.

[0055] Specifically, this embodiment further clarifies the directional requirements of the optical electric field detection device when acquiring electric field components. For example... Figure 2 As shown in (a), when the optical electric field detection device is parallel to the axis of the multi-break vacuum circuit breaker, it is used to collect the tangential electric field component. Since the tangential electric field component is the electric field intensity along the surface of the circuit breaker, the detection method parallel to the axis can more accurately capture this electric field information propagating along the surface, avoiding measurement errors caused by improper detection direction. However, as... Figure 2 As shown in (b), when the optical electric field detection device is perpendicular to the axis, it is responsible for acquiring the normal electric field component. The normal electric field component is perpendicular to the circuit breaker surface and directly reflects the electric field strength at the break point. The perpendicular detection direction ensures accurate measurement of this key electric field component. By clarifying these two different detection directions, the optical electric field detection device can more accurately acquire the tangential and normal electric field components respectively, providing a more reliable data basis for accurately determining the breakdown state of the circuit breaker.

[0056] In this embodiment, clearly defining the sampling direction of the electric field components has significant advantages. It improves the accuracy of tangential and normal electric field measurements, avoids measurement errors caused by ambiguity in the detection direction, and allows the collected electric field data to more accurately reflect the electric field distribution on the circuit breaker surface and the electric field strength at the break point. Accurate electric field data provides a solid foundation for subsequent data processing and analysis, helps to more accurately determine the circuit breaker's break-through state, detect potential faults in advance, take timely maintenance measures, ensure the safe and stable operation of the power system, and improve the reliability of power supply.

[0057] In one embodiment, the optical electric field probe in the optical electric field detection device is specifically an electro-electric field measurement probe based on the Pockels effect.

[0058] The optical electric field probe is the core component of an optical electric field detection device. It is a device that directly interacts with the electric field and converts it into a measurable optical signal. The performance of the optical electric field probe directly determines the measurement accuracy and reliability of the entire optical electric field detection device. The Pockels effect refers to the linear change in the refractive index of certain electro-optic crystals under the influence of an applied electric field. This change in refractive index is proportional to the strength of the applied electric field. By detecting the change in the optical signal caused by this change in refractive index, the strength of the electric field can be indirectly measured. The electro-optic electric field measurement probe is a probe specifically designed for measuring electric fields based on the Pockels effect. It converts the electric field signal into an optical signal, analyzes and processes the optical signal using optical detection technology, and thus achieves the measurement of the electric field strength.

[0059] Specifically, this embodiment further specifies that the optical electric field probe in the optical electric field detection device is an electro-optical field measurement probe based on the Pockels effect. When an electric field is applied to the probe, due to the Pockels effect, the refractive index of the electro-optic crystal (such as lithium niobate crystal) inside the probe changes with the change in electric field strength. This change in refractive index causes corresponding changes in the phase, polarization state, and other characteristics of the light signal passing through the crystal. The electro-optical field measurement probe accurately detects and analyzes these changes in light signals through a built-in optical detection system, such as an interferometer or polarizer. Based on the quantitative relationship between the change in light signal and the electric field strength, the magnitude of the electric field can be calculated. This electric field measurement method based on the Pockels effect has advantages such as high sensitivity, fast response, and strong anti-electromagnetic interference capability. It can accurately measure the electric field components around a multi-break vacuum circuit breaker in complex electromagnetic environments, providing reliable data support for determining the breakdown state of the circuit breaker.

[0060] In this embodiment, an electro-electric field measurement probe based on the Pockels effect is used as the core component of the optical electric field detection device, bringing several significant advantages. High sensitivity allows the probe to detect even weak electric field changes, enabling accurate measurements even under low electric field strength, which helps in detecting early insulation defects and potential faults in circuit breakers. Fast response capability ensures the probe can promptly capture transient changes in the electric field, crucial for analyzing the electric field characteristics of circuit breakers under transient conditions such as impulse voltages. Strong anti-electromagnetic interference capability ensures the probe can operate stably in complex electromagnetic environments, unaffected by external electromagnetic signals, improving measurement accuracy and reliability. These advantages collectively enhance the performance of the entire circuit breaker measurement system, providing strong support for ensuring the safe operation of the power system.

[0061] In one embodiment, the electric field sensing element in the electro-optical field measurement probe is: Electro-optic crystal.

[0062] Among them, the electric field sensing element is the key component in the electro-optical field measurement probe that directly senses the electric field and generates an optical response. Its performance directly affects the conversion efficiency and measurement accuracy of the electric field signal of the electro-optical field measurement probe. Electro-optic crystals, also known as lithium niobate crystals, are crystal materials with excellent electro-optic effects and optical properties. They have wide applications in optical fields such as electro-optic modulation and frequency conversion, and also play an important role in electric field measurement.

[0063] Specifically, this embodiment explicitly states that the electric field sensing element in the electro-optical field measurement probe is... Electro-optic crystal. The crystal possesses a unique crystal structure, which enables it to produce a significant electro-optic effect under the influence of an applied electric field. When an electric field is applied... When applied to a crystal, the refractive index changes linearly, and this change exhibits a strong linear relationship with the electric field strength. This linear relationship allows for the accurate calculation of the electric field strength by detecting the change in the optical signal caused by the change in the crystal's refractive index. Simultaneously, The crystal also possesses a high electro-optic coefficient, meaning that under the same electric field strength, it can produce a larger refractive index change, thereby improving the sensitivity of electric field measurements. Furthermore, Crystals possess excellent optical transparency and stability, enabling them to operate over a wide spectral range. Furthermore, they are relatively insensitive to changes in environmental factors such as temperature and humidity, ensuring the accuracy and reliability of electric field measurements. In electro-optical field measurement probes, As an electric field sensitive element, the crystal efficiently converts electric field signals into optical signals, providing a good foundation for subsequent optical detection and analysis.

[0064] In this embodiment, the following is adopted: Electro-optic crystals, as the electric field-sensitive elements in electro-optic field measurement probes, offer numerous significant advantages. Their high electro-optic coefficient results in higher probe sensitivity, enabling the detection of even weaker electric field changes, which helps in identifying early insulation problems in circuit breakers. Excellent optical transparency ensures efficient propagation of optical signals within the crystal, reducing signal loss and improving measurement accuracy. Good stability allows the probe to maintain stable performance under various environmental conditions, minimizing measurement errors caused by environmental variations. These advantages make it suitable for applications based on… Electro-optic crystals can more accurately measure the electric field components around multi-break vacuum circuit breakers, providing more reliable data for determining the breakdown state of the circuit breaker, thereby ensuring the safe and stable operation of the power system.

[0065] In one embodiment, the distance between the optical electric field detection device and the multiple sampling points ranges from 1mm to 2mm.

[0066] The spacing range refers to the upper and lower limits of the allowable distance between the optical electric field detection equipment and the acquisition points. Multiple acquisition points are specific locations selected on the surface of the multi-break vacuum circuit breaker for acquiring the tangential electric field component. The selection of these points is based on a comprehensive consideration of the electric field distribution on the circuit breaker surface, aiming to obtain more comprehensive surface electric field information through multi-point acquisition.

[0067] Specifically, such as Figure 2 (a) and Figure 2 As shown in (b), this embodiment specifies that the distance between the optical electric field detection device and multiple acquisition points is 1mm-2mm. Within this specific distance range, the optical electric field detection device can effectively acquire the tangential electric field component. If the distance is too small, such as less than 1mm, the optical electric field detection device may interfere with the electric field distribution on the circuit breaker surface, changing the original electric field state, thus leading to inaccurate measurement results. At the same time, too small a distance may also increase the difficulty of device installation and operation, and may even damage the device due to contact with the circuit breaker surface. On the other hand, if the distance is too large, such as greater than 2mm, the electric field signal will attenuate during propagation, resulting in a weakening of the signal strength received by the detection device, thereby affecting the sensitivity and accuracy of the measurement. Therefore, controlling the distance within the range of 1mm-2mm can ensure that the optical electric field detection device can effectively acquire the tangential electric field component, minimize interference with the electric field distribution on the circuit breaker surface, and take into account the convenience of device installation and operation.

[0068] In one embodiment, the spacing between multiple sampling points ranges from 5mm to 10mm.

[0069] Specifically, when measuring the tangential electric field component on the surface of a multi-break vacuum circuit breaker, it is crucial to appropriately select multiple sampling points on the circuit breaker surface. Because the electric field distribution on the circuit breaker surface is not uniform, a single sampling point cannot accurately reflect the overall electric field situation, while multiple sampling points can cover different areas and obtain more comprehensive electric field information. For example... Figure 3 As shown, controlling the spacing between multiple sampling points within the range of 5mm-10mm is the result of extensive experiments and research. If the spacing is too small, the electric field information collected by adjacent sampling points will be too similar, failing to provide more effective information and increasing measurement costs and complexity. If the spacing is too large, it may miss electric field changes in some key areas, leading to inaccurate measurement results that cannot truly reflect the electric field distribution on the circuit breaker surface.

[0070] In this embodiment, by reasonably determining the spacing range between multiple acquisition points, the tangential electric field components on the surface of the multi-break vacuum circuit breaker can be obtained comprehensively and accurately. Multi-point acquisition avoids measurement errors caused by special local electric field conditions, providing a more reliable data foundation for subsequent analysis of the circuit breaker's operating status and judgment of the break-down state, thus helping to improve the accuracy and timeliness of fault diagnosis.

[0071] In one embodiment, the distance between the optical electric field detection device and the multiple breaks ranges from 1 mm to 2 mm.

[0072] In a multi-break vacuum circuit breaker, multiple breaks are the various intervals used to disconnect the circuit. The electric field distribution at each break is crucial to the insulation performance and breakdown characteristics of the circuit breaker.

[0073] Specifically, when using optical electric field detection equipment to collect the normal electric field component of a multi-break vacuum circuit breaker, controlling the distance between the optical electric field detection equipment and the multiple breaks is crucial. The optical electric field detection equipment measures the electric field non-contactly. If the distance to the breaks is too great, the electric field signal will attenuate during propagation, resulting in a weak signal received by the detection equipment and affecting measurement accuracy. If the distance is too small, it may interfere with the electric field distribution on the circuit breaker surface, altering the original electric field state and leading to inaccurate measurement results. Furthermore, it increases the risk of collision damage between the equipment and the circuit breaker. Maintaining a distance of 1mm-2mm ensures that the optical electric field detection equipment effectively receives the normal electric field signal while minimizing interference with the electric field distribution and the possibility of equipment damage.

[0074] In this embodiment, the distance between the optical electric field detection device and multiple breaks is reasonably controlled to ensure the accuracy and reliability of the normal electric field component measurement. This avoids measurement errors and equipment damage caused by improper distance, and provides key data for accurately determining the breakdown state of multi-break vacuum circuit breakers, thus helping to ensure the safe and stable operation of the power system.

[0075] In one embodiment, the control device is specifically used to: determine the abrupt change frequencies corresponding to the electrical information, the tangential electric field component, and the normal electric field component, respectively; and determine the breakdown state of the multi-break vacuum circuit breaker based on each abrupt change frequency.

[0076] The mutation frequency refers to the number or frequency of abrupt changes in electrical information, tangential electric field components, and normal electric field components within a specific time period. These parameter mutations are often associated with circuit breaker faults or abnormal conditions. Breakdown condition refers to whether the contacts of a multi-break vacuum circuit breaker break down under voltage or other influences. Breakdown can lead to serious consequences such as short circuits, affecting the normal operation of the power system.

[0077] Specifically, the system receives electrical information, tangential electric field components, and normal electric field components collected from electrical information detection equipment and optical electric field detection equipment. Then, the control equipment analyzes this data to determine the frequency of abrupt changes for each parameter. Because when a multi-break vacuum circuit breaker experiences faults such as break-through, the electrical information, tangential electric field components, and normal electric field components often undergo abrupt changes, analyzing the frequency of these parameter changes allows for a more accurate determination of whether the circuit breaker is in a break-through state. For example, after the control equipment acquires electrical information, tangential electric field components, and normal electric field components, if the voltage and current values ​​are normal, the waveforms are stable, the current harmonic content is low, the rate of change of the tangential electric field components is normal, the surface distribution is uniform without local concentration, and the peak value of the normal electric field components is within the normal threshold and the frequency of change is stable, then it is determined that none of the breaks in the multi-break vacuum circuit breaker have broken down. When the voltage drops significantly, the current suddenly increases and contains abnormal harmonics, the rate of change of the tangential electric field components in some areas increases significantly and local concentration occurs, and the peak value of the normal electric field components corresponding to the suspected breakdown break increases sharply and the frequency of change increases significantly, it is determined that some breaks have broken down. If the voltage gradually decreases over time, the current increases abruptly multiple times, the distribution of the tangential electric field components changes continuously with the successive breakdowns of the breaks and staged local concentration occurs, and the peak value of the normal electric field components increases sharply and the frequency of change increases accordingly when each break breaks down, then it is determined that each break has broken down sequentially, and the corresponding results are output and fed back.

[0078] In this embodiment, the control equipment determines the breakdown state of the multi-break vacuum circuit breaker by analyzing the frequency of abrupt changes in various parameters, thus improving the accuracy and timeliness of fault diagnosis. This allows for the early detection of potential circuit breaker faults, preventing the fault from escalating and causing more serious consequences. It provides reliable decision-making support for power system maintenance personnel, ensuring the safe and stable operation of the power system.

[0079] In one embodiment, a circuit breaker measurement method is also provided, the method comprising: acquiring electrical information, tangential electric field components, and normal electric field components collected from a multi-break vacuum circuit breaker; wherein, the tangential electric field components are acquired by an optical electric field detection device at multiple acquisition points on the surface of the multi-break vacuum circuit breaker under impulse voltage and without contact with the multi-break vacuum circuit breaker; the normal electric field components are acquired by the optical electric field detection device at multiple breaks in the multi-break vacuum circuit breaker; the electrical information is acquired by an electrical information detection device at the multi-break vacuum circuit breaker; and the breakdown state of the multi-break vacuum circuit breaker is determined based on the electrical information, the tangential electric field components, and the normal electric field components.

[0080] Specifically, the circuit breaker measurement method in this embodiment first collects electrical information of the multi-break vacuum circuit breaker using electrical information detection equipment. This information reflects the overall operating status of the circuit breaker in the power system. Simultaneously, using optical electric field detection equipment, under the condition that the multi-break vacuum circuit breaker is subjected to impulse voltage and is not in contact, tangential electric field components are collected at multiple sampling points on the circuit breaker surface to understand the electric field distribution on the circuit breaker surface. Furthermore, the optical electric field detection equipment also collects normal electric field components at multiple breaks in the circuit breaker, directly obtaining key electric field information at the breaks. Finally, by comprehensively analyzing the collected electrical information, tangential electric field components, and normal electric field components, and using specific algorithms and judgment criteria, the breakdown state of the multi-break vacuum circuit breaker is determined. This method obtains relevant information about the circuit breaker from multiple dimensions, enabling a more comprehensive and accurate assessment of the circuit breaker's operating status.

[0081] In one embodiment, determining the breakdown state of a multi-break vacuum circuit breaker based on electrical information, tangential electric field components, and normal electric field components includes: determining the abrupt change frequencies corresponding to the electrical information, tangential electric field components, and normal electric field components, respectively; and determining the breakdown state of the multi-break vacuum circuit breaker based on each abrupt change frequency.

[0082] Specifically, after receiving electrical information, tangential electric field components, and normal electric field components collected from electrical information detection equipment and optical electric field detection equipment, it is necessary to analyze these data to determine the abrupt change frequency corresponding to each parameter. This is because when a multi-break vacuum circuit breaker experiences faults such as break-through, the electrical information, tangential electric field components, and normal electric field components often undergo abrupt changes. By analyzing the abrupt change frequencies of these parameters, it is possible to more accurately determine whether the circuit breaker is in a break-through state. For example, after acquiring electrical information, tangential electric field components, and normal electric field components, if the voltage and current values ​​are normal, the waveforms are stable, the current harmonic content is low, the rate of change of the tangential electric field components is normal, the surface distribution is uniform without local concentration, and the peak value of the normal electric field components is within the normal threshold and the frequency of change is stable, then it is determined that none of the breaks in the multi-break vacuum circuit breaker have broken down. When the voltage drops significantly, the current suddenly increases and contains abnormal harmonics, the rate of change of the tangential electric field components in some areas increases significantly and local concentration occurs, and the peak value of the normal electric field components corresponding to the suspected breakdown break increases sharply and the frequency of change increases significantly, it is determined that some breaks have broken down. If the voltage gradually decreases over time, the current increases abruptly multiple times, the distribution of the tangential electric field components changes continuously with the successive breakdowns of the breaks and staged local concentration occurs, and the peak value of the normal electric field components increases sharply and the frequency of change increases accordingly when each break breaks down, then it is determined that each break has broken down sequentially, and the corresponding results are output and fed back.

[0083] In this embodiment, the breakdown state of the multi-break vacuum circuit breaker is determined by analyzing the frequency of abrupt changes in various parameters, thus improving the accuracy and timeliness of fault diagnosis. This allows for the early detection of potential circuit breaker faults, preventing the escalation of faults and avoiding more serious consequences. It provides reliable decision-making support for power system maintenance personnel, ensuring the safe and stable operation of the power system.

[0084] In one specific embodiment, a circuit breaker measurement system based on the Pockels effect is also provided for measuring the electric field in space. The electric field probe employs... Electro-optic crystals are used as electric field sensing elements. When an external electric field is applied to an electro-optic crystal, birefringence occurs inside the crystal, causing a phase change in the polarization of incident polarized light as it propagates within the crystal. This phase change is detected by an optical analyzer, and the optical signal is converted into an electrical signal by a photoelectric converter, thus obtaining an electric field measurement signal corresponding to the applied electric field strength.

[0085] Depending on the relative arrangement of the probe and the surface being measured, measurements of electric field components in different directions can be achieved. In tangential electric field measurement methods, such as... Figure 2 As shown in (a), the optical electric field probe of the optical electric field detection device is arranged along the tangential direction of the surface being measured, so that the probe's measurement axis is parallel to the surface being measured, for measuring the tangential electric field component near the insulating surface; in the normal electric field measurement method, as... Figure 2 As shown in (b), the optical electric field probe is arranged along the normal direction of the surface being measured, with the probe's measurement axis perpendicular to the surface, to measure the normal electric field component at that location. To minimize the influence of the probe on the original electric field distribution, a distance of 1-2 mm is preferably maintained between the probe and the surface being measured.

[0086] like Figure 3 As shown, during the measurement of the surface electric field distribution, the optical electric field probe is positioned near the ceramic shell of the vacuum interrupter and moved point by point along the axial direction of the ceramic shell for measurement. Specifically, starting from one end of the interrupter, the electric field probe is moved point by point along the surface of the ceramic shell to the other end. By collecting electric field signals at different locations, the electric field distribution near the outer surface of the interrupter is obtained. The preferred spacing between adjacent measurement points is 5-10 mm.

[0087] The above method enables non-contact measurement of the surface electric field distribution of the insulation structure of a multi-break vacuum circuit breaker, thereby obtaining the electric field distribution characteristics of the outer surface of the arc-extinguishing chamber. To verify the effectiveness of the method, a 2×24kV double-break vacuum arc-extinguishing chamber was selected as the test object. The electric field distribution on its outer surface under lightning impulse voltage was measured, and the measurement results were compared with the COMSOL electric field simulation results. The results are as follows: Figure 4As shown in the figure. The comparison results show that the experimentally measured electric field variation trend is basically consistent with the simulation calculation results, indicating that the non-contact electric field measurement method proposed in this invention can effectively reflect the electric field distribution characteristics of the outer surface of the multi-break vacuum arc interrupter. Since the simulation calculation cannot fully reflect the actual experimental environment, and factors such as measurement errors may have a certain impact on the measurement results, there are certain differences between the simulation curve and the experimental curve. However, this difference does not have a substantial impact on the determination of the overall variation trend of the electric field distribution on the outer surface.

[0088] In the process of measuring the breakdown characteristics of multi-break vacuum circuit breakers, an optical electric field probe is positioned near the connection point between adjacent breaks to measure the normal electric field component at that location. Since changes in the potential at the break connection point cause changes in the electric field distribution in the surrounding space, measuring the change in the normal electric field at this location can characterize the potential change process at the break connection point. When a multi-break vacuum circuit breaker experiences breakdown or partial discharge under voltage, the voltage distribution between the breaks changes, leading to changes in the potential at the connection point and further causing changes in the electric field of the surrounding space.

[0089] By measuring the change in the normal electric field at the connection point in real time, and combining this with the measurement results of the total voltage and circuit current across the multi-break vacuum circuit breaker, the voltage, electric field, and current variation characteristics of the multi-break vacuum circuit breaker under impulse voltage can be obtained, thereby enabling the determination of its breakdown characteristics and breakdown sequence. To illustrate the effectiveness of the method of this invention, a 2×24kV double-break vacuum interrupter was selected as the test object, and its breakdown characteristics and breakdown sequence under lightning impulse voltage were measured. First, the potential at the double-break connection point was directly measured, and the result was compared with the measurement result of the normal electric field at the connection point, such as... Figure 5 As shown in the figure. The comparison results show that the two are basically consistent in waveform characteristics and change timing, indicating that the change of normal electric field at the connection can effectively characterize the change characteristics of potential at the double-break connection.

[0090] By further combining the measurement results of the total voltage and circuit current at both ends of the double-break vacuum interrupter, the breakdown characteristics and breakdown sequence of the double-break vacuum circuit breaker under impulse voltage can be determined. Through comprehensive analysis of voltage, normal electric field, and current waveforms, various typical breakdown modes of the double-break vacuum interrupter can be obtained, such as... Figures 6 to 8 As shown. By analyzing the typical waveforms described above, the breakdown characteristics of the double-fracture vacuum interrupter and the breakdown sequence of each fracture can be identified. Among them, Figure 6 This is a typical waveform where none of the fracture points have broken down. Figure 7 This is a typical waveform of partial breakdown. Figure 8 This is a typical waveform of each fracture breaking down sequentially.

[0091] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0092] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 9 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a circuit breaker measurement method. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0093] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0094] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0095] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0096] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method described above.

[0097] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0098] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0100] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A circuit breaker measurement system characterized by, The system includes an optical electric field detection device, an electrical information detection device, and a control device; the control device is connected to the optical electric field detection device and the electrical information detection device. The optical electric field detection device is used to collect tangential electric field components at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the multi-break vacuum circuit breaker is subjected to impulse voltage and is not in contact with the multi-break vacuum circuit breaker, and to collect normal electric field components at multiple breaks in the multi-break vacuum circuit breaker. The electrical information detection device is used to collect electrical information of the multi-break vacuum circuit breaker; The control device is used to acquire the electrical information, the tangential electric field component, and the normal electric field component, and to determine the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, the tangential electric field component, and the normal electric field component.

2. The system of claim 1, wherein, Specifically, the optical electric field detection device collects the tangential electric field component when it is parallel to the axial direction of the multi-break vacuum circuit breaker, and collects the normal electric field component when it is perpendicular to the axial direction.

3. The system according to claim 1, characterized in that, The optical electric field probe in the optical electric field detection device is specifically an electro-electric field measurement probe based on the Pockels effect.

4. The system according to claim 3, characterized in that, The electric field sensing element in the electro-optical field measurement probe is: Electro-optic crystal.

5. The system according to claim 1, characterized in that, The distance between the optical electric field detection device and the plurality of acquisition points ranges from 1mm to 2mm.

6. The system according to claim 1, characterized in that, The spacing between the multiple collection points ranges from 5mm to 10mm.

7. The system according to claim 1, characterized in that, The distance between the optical electric field detection device and the plurality of breaks is in the range of 1mm-2mm.

8. The system according to claim 1, characterized in that, The control device is specifically used for: Determine the abrupt change frequencies corresponding to the electrical information, the tangential electric field component, and the normal electric field component, respectively; Based on the aforementioned mutation frequencies, the breakdown state of the multi-break vacuum circuit breaker is determined.

9. A method for measuring circuit breakers, characterized in that, The method includes: Acquire electrical information, tangential electric field components, and normal electric field components for multi-break vacuum circuit breakers; The tangential electric field component is acquired by an optical electric field detection device at multiple sampling points on the surface of the multi-break vacuum circuit breaker when the device is under impulse voltage and is not in contact with the multi-break vacuum circuit breaker; the normal electric field component is acquired by the optical electric field detection device at multiple breaks in the multi-break vacuum circuit breaker; and the electrical information is acquired by an electrical information detection device at the multi-break vacuum circuit breaker. Based on the electrical information, the tangential electric field component, and the normal electric field component, the breakdown state of the multi-break vacuum circuit breaker is determined.

10. The method according to claim 9, characterized in that, Determining the breakdown state of the multi-break vacuum circuit breaker based on the electrical information, the tangential electric field component, and the normal electric field component includes: Determine the abrupt change frequencies corresponding to the electrical information, the tangential electric field component, and the normal electric field component, respectively; Based on the aforementioned mutation frequencies, the breakdown state of the multi-break vacuum circuit breaker is determined.

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