10kv manual nuclear phase special anti-discharge protection device and method thereof

Abstract

This invention provides a 10kV artificial phase tracing dedicated anti-discharge protection device and method, belonging to the field of high-voltage phase tracing technology in power systems. The device includes an insulating protection body, an equipotential shielding component, an overvoltage absorption component, and an arc suppression component. The equipotential shielding component is grounded through a metal shielding layer to suppress the induced voltage to a safe value; the overvoltage absorption component uses zinc oxide valve plates to absorb operational overvoltages; and the arc suppression component uses a vacuum arc-extinguishing chamber to quickly extinguish the arc when the electrodes contact or separate. This invention provides a 10kV artificial phase tracing dedicated anti-discharge protection device and method that, by integrating multiple protection mechanisms, systematically solves the core safety hazards in artificial phase tracing operations, such as induced electric shock, operational overvoltage discharge, and arc burns, reducing safety risks by more than 90%, while improving operational accuracy and efficiency, and possessing high reliability and strong environmental adaptability.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage phase matching technology in power systems, and more specifically, relates to a 10kV artificial phase matching dedicated anti-discharge protection device and method. Background Technology

[0002] In 10kV and above power systems, phase verification is a necessary step to verify the phase relationship and voltage difference between two independent power sources, and is a key operation to ensure the safe parallel operation of the power system and the safe connection of equipment. Phase verification is usually performed manually, by touching live parts with a phase comparator. Currently, manual phase verification mainly relies on conventional protective equipment such as insulating rods and insulating gloves, and lacks dedicated protective devices for the multiple electrical risks in phase verification scenarios.

[0003] When working in confined spaces such as transformer substations and ring main units, operators face the following safety risks: First, induced voltage can be generated on de-energized lines due to proximity to live lines or long-distance wiring. According to statistics from the "Electrical Safety Work Regulations," electric shock accidents caused by induced voltage account for approximately 23% of high-voltage work accidents. Second, the operational overvoltage amplitude generated when phase electrodes come into contact or detach can reach 3-5 times the rated voltage, easily causing gap discharge. Third, high-temperature arcs can be generated when there is a phase error or poor contact; the mortality rate for arc burn accidents is as high as 30%. Fourth, the confined space inside transformer substations and ring main units makes it easy for operators to accidentally touch adjacent live sections.

[0004] To address the aforementioned issues, some improvements have been made in the existing technology, such as adding an insulating extension rod to the phase comparator or using a wireless phase comparator. However, these solutions mainly address the issues of operating distance or signal transmission, and fail to systematically suppress induced electricity, absorb operating overvoltage, and extinguish arcs quickly. Furthermore, their reliability in complex operating conditions such as high humidity and confined spaces remains insufficient. Summary of the Invention

[0005] The purpose of this invention is to provide a 10kV artificial phase merging dedicated anti-discharge protection device and method, which aims to solve the technical problem that the existing technology lacks systematic safety protection measures for artificial phase merging operations, resulting in deficiencies in induced current suppression, overvoltage absorption, and rapid arc extinguishing.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a 10kV artificial phase comparison dedicated anti-discharge protection device for use in conjunction with a phase comparison instrument, comprising: An insulating protective body has a core phase electrode connected to one end, which is used to contact a charged body and collect electrical signals. An equipotential shielding assembly includes a metal shielding layer disposed outside the insulating protective body, the metal shielding layer being grounded to suppress induced voltage to below a safe threshold. An overvoltage absorption component is disposed inside the insulating protection body and electrically connected to the core phase electrode. The overvoltage absorption component includes a zinc oxide valve plate for absorbing operational overvoltages. An arc suppression assembly includes a vacuum interrupter chamber, which is configured to cooperate with the contact end of the core phase electrode for rapidly cutting off the generated arc when the core phase electrode contacts or separates from it. A signal transmission interface is used to electrically connect to the nuclear phase electrode and to transmit the signal collected by the nuclear phase electrode to the phase comparator.

[0007] In one possible implementation, the insulating protective body adopts a three-layer epoxy resin insulating cover structure, and its creepage distance is set according to the voltage level.

[0008] In one possible implementation, the creepage distance for a 10kV power system is ≥400mm, the creepage distance for a 35kV power system is ≥1000mm, and the grounding resistance of the metal shielding layer is ≤10Ω.

[0009] In one possible implementation, the nuclear phase electrode is a spherical electrode to reduce the electric field concentration effect.

[0010] In one possible implementation, the overvoltage absorption assembly further includes a fuse connected in series with the zinc oxide valve plate, the fuse being used to disconnect the circuit and trigger a mechanical alarm indication when the zinc oxide valve plate fails.

[0011] In one possible implementation, the arc suppression assembly further includes a gas-generating arc-extinguishing material, which works in conjunction with the vacuum arc-extinguishing chamber to generate an inert gas during arc extinguishing to suppress arc reignition.

[0012] In one possible implementation, the arc-extinguishing time of the vacuum arc-extinguishing chamber is ≤5ms, and the arc-extinguishing capacity is ≥20kA.

[0013] In one possible implementation, the 10kV artificial phase nucleation dedicated anti-discharge protection device also includes: An insulating rod is connected at one end to the end of the insulating protective body away from the nuclear phase electrode, and the axial direction of the insulating rod is along the axial direction of the insulating protective body.

[0014] This invention also provides a 10kV artificial phase nucleation-specific anti-discharge protection method, comprising the following steps: Step S1: Assemble the insulating protective body with the nuclear phase electrode, and ground the metal shielding layer; Step S2: Suppress the induced voltage generated during nucleation to a safe threshold using the equipotential shielding component; Step S3: At the instant the nuclear phase electrode contacts or detaches from the charged body, the arc is quickly extinguished by the arc suppression component; Step S4: When an operational overvoltage occurs, the overvoltage energy is absorbed by the overvoltage absorption component, limiting the overvoltage amplitude to a safe range.

[0015] In one possible implementation, the method further includes the step of automatically disconnecting the circuit and issuing a mechanical alarm via a built-in fuse when the overvoltage absorption component fails.

[0016] The beneficial effects of the 10kV artificial phase fusion special anti-discharge protection device and method provided by the present invention are as follows: Compared with the prior art, firstly, by integrating equipotential shielding components, overvoltage absorption components and arc suppression components, it realizes three major functional modules: equipotential shielding, overvoltage absorption and rapid arc extinguishing, systematically solving the three core safety risks of induced electricity, operating overvoltage and arc burns in the phase fusion operation process, reducing safety hazards by more than 90%.

[0017] Secondly, the metal shielding layer effectively suppresses external electromagnetic interference, which improves the phase measurement accuracy from ±5° of the traditional method to within ±0.5°. At the same time, due to the significant improvement in operational safety, operators are more confident in their operations and the process is smoother, which can shorten the time of a single phase comparison operation from 2 hours to within 45 minutes, improving efficiency by more than 50%.

[0018] Third, the overall insulation level of the device of the present invention meets the requirements of the 10kV power system. Through grounding interlocking and overvoltage absorption components, it avoids the introduction of new risks such as secondary discharge or short circuit, thus ensuring the inherent safety of the device.

[0019] Fourth, the protection level can reach IP65, which can adapt to the operation requirements under harsh weather conditions such as high humidity (≤85%). Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a 10kV artificial phase nucleation-specific anti-discharge protection device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating another usage state of a 10kV artificial phase nucleation-specific anti-discharge protection device provided in an embodiment of the present invention; Figure 3A half-sectional schematic diagram of the equipotential shielding component of a 10kV artificial nucleus phase-specific anti-discharge protection device provided in an embodiment of the present invention; Figure 4 A half-sectional schematic diagram of the overvoltage absorption component of a 10kV artificial phase nucleation-specific anti-discharge protection device provided in an embodiment of the present invention; Figure 5 A half-sectional schematic diagram of the arc suppression component of a 10kV artificial phase nucleation-specific anti-discharge protection device provided in an embodiment of the present invention; Figure 6 A flowchart of a 10kV artificial phase nucleation-specific anti-discharge protection method provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Insulation and protection main body; 2. Equipotential shielding assembly; 21. Metal shielding layer; 22. Grounding wire; 3. Overvoltage absorption assembly; 31. Zinc oxide valve plate; 4. Arc suppression assembly; 41. Vacuum interrupter; 5. Core phase electrode; 6. Insulating rod; 61. Socket; 7. Epoxy resin insulation structure. Detailed Implementation

[0023] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0024] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] Based on the above problems, how to provide a dedicated anti-discharge protection device that can systematically solve multiple safety risks such as induced electric shock, operational overvoltage discharge and arc burns in manual phase fusion operations, and is compact in structure, easy to operate and highly reliable, is a technical problem that urgently needs to be solved in this field.

[0027] The following is a detailed description of a 10kV artificial phase nucleation-specific anti-discharge protection device and method provided in the embodiments of this application, with reference to the accompanying drawings.

[0028] This application proposes a dedicated anti-discharge protection device for 10kV manual phase comparison. The device includes an insulating protective body 1, an equipotential shielding component 2, an overvoltage absorption component 3, an arc suppression component 4, and a signal transmission interface. It is mainly used to solve safety issues during manual phase comparison operations in scenarios such as 10kV transformer substations and ring main units. The anti-discharge protection device provided by this invention is used in conjunction with a phase comparison instrument. The signal transmission interface is electrically connected to the signal input terminal of the phase comparison instrument via a shielded cable. During phase comparison operations, the operator holds the insulating protective body 1 and contacts the phase comparison electrode 5 to the high-voltage live conductor under test. The voltage signal collected by the phase comparison electrode 5 is processed sequentially by the arc suppression component 4 and the overvoltage absorption component 3, and then sent to the phase comparison instrument through the signal transmission interface. The phase comparison instrument filters, amplifies, and performs analog-to-digital conversion on the received signal, and calculates parameters such as phase difference and voltage difference, ultimately displaying the phase comparison result. This device works in conjunction with the phase comparison instrument, with the device providing front-end safety protection and the phase comparison instrument providing back-end measurement and display functions.

[0029] The insulating protective body 1 is used for fixed connection with the phase comparison electrode 5, which is used to contact the charged body and collect electrical signals. The insulating protective body 1 serves as the base of the device, supporting and connecting the phase comparison electrode 5. To meet the insulation requirements of a 10kV power system, the insulating protective body 1 adopts a three-layer epoxy resin insulating cover structure. Its creepage distance is set according to the voltage level: ≥400mm for 10kV power systems and ≥1000mm for 35kV power systems, ensuring no surface flashover occurs under rated voltage and certain overvoltages. The signal transmission interface is located on the insulating protective body 1 (the specific location is not limited) for electrical connection with the phase comparison electrode 5, transmitting the signals collected by the phase comparison electrode 5 to the phase comparator. The signal transmission interface can be located away from the phase comparison electrode 5 for easy electrical connection with the phase comparator.

[0030] The equipotential shielding component 2 includes a metal shielding layer 21 disposed outside the insulating protective body 1. The insulating protective body 1 is cylindrical, with an outer wall of epoxy resin insulation structure 7. The metal shielding layer 21 is mainly located in the central region along the axial direction of the insulating protective body 1, on the outer layer of the epoxy resin insulation structure 7. The metal shielding layer 21 is connected to the equipotential suit worn by the worker (or directly) via a grounding wire 22 and is ultimately grounded. The grounding resistance of the metal shielding layer 21 is ≤10Ω to suppress the induced voltage to below a safe threshold. When the nucleation electrode 5 approaches a high-voltage live conductor, the generated induced voltage is first coupled to the metal shielding layer 21 and discharged through a grounding circuit. Test data shows that on a 10kV line 1.5 meters long adjacent to a live line, before using the device of this invention, the induced voltage was as high as 4.2kV. After using the device of this invention, the induced voltage was suppressed to 23V, far below the 50V personal safety voltage. The overvoltage absorption component 3 and the arc suppression component 4 are respectively located near both ends of the insulating protection body 1 and are not covered by the metal shielding layer 21, wherein the arc suppression component 4 is located near the core phase electrode 5.

[0031] The overvoltage absorption component 3 is housed inside the insulating protection body 1, with one end extending out of the insulating protection body 1. This end is used to connect to the grounding system, and its input end is electrically connected to the phase-combining electrode 5. The overvoltage absorption component 3 includes a zinc oxide valve plate 31 (MOV, the model of which is selected according to the system voltage) used to absorb operational overvoltages. For a 10kV power system, an MOV with a rated voltage of 12.7kV is selected, with a DC reference voltage ≥38.3kV and an operational impulse residual voltage ≤45kV. When an operational overvoltage is generated during phase-combining operation, the MOV quickly conducts, clamping the overvoltage amplitude to a safe level.

[0032] To prevent accidents caused by MOV short-circuit failure, the overvoltage absorption assembly 3 also includes a fuse connected in series with the zinc oxide valve plate 31. The fuse is used to disconnect the circuit (fuse blows) when the zinc oxide valve plate 31 fails (due to deterioration or overload and short circuit), cut off the fault circuit, and trigger a mechanical alarm indication to prompt the operator to replace the module.

[0033] The rated current of the fuse is set based on the maximum allowable current of the MOV and the possible fault current of the system, ensuring that the fuse does not trip when the MOV is working normally, and only reliably blows when the MOV experiences a short circuit failure. The mechanical alarm indicator adopts a spring-triggered structure. When the fuse blows, the spring connected to its end loses tension and springs open, causing the alarm indicator to pop out of the observation window of the insulation protection body 1. It clearly shows in a conspicuous color (such as red) that the overvoltage absorption component 3 has failed, making it easy for operators to quickly identify and handle the problem.

[0034] The arc suppression component 4 includes a vacuum interrupter 41, which is configured to engage with the contact end of the core electrode 5 to quickly interrupt the arc generated when the core electrode 5 contacts or detaches. The arc suppression component 4 is located at the contact end of the core electrode 5, and its core is the vacuum interrupter 41. The arc extinguishing time of the vacuum interrupter 41 is ≤5ms. At the instant the core electrode 5 contacts or detaches from the charged body, the generated arc is introduced into the vacuum interrupter 41 and rapidly extinguished in the vacuum.

[0035] At the moment of contact: When the core electrode 5 approaches the charged body, current flows through the moving and stationary contacts within the vacuum interrupter 41, putting the vacuum interrupter 41 in a conductive state. At the moment of separation: When the core electrode 5 separates from the charged body, an electric arc is generated between the moving and stationary contacts of the vacuum interrupter 41. Arc extinguishing: The vacuum environment causes the arc to spread and cool rapidly, extinguishing naturally when the current crosses zero. The core electrode 5 includes a front contact and a rear conductive rod, with the vacuum interrupter 41 connected in series between the front contact and the rear conductive rod. The vacuum interrupter 41 includes a stationary contact, a moving contact, and a ceramic shell. The stationary contact is electrically connected to the front contact, and the moving contact is electrically connected to the rear conductive rod. When the core electrode 5 contacts the charged body, current flows through the front contact, stationary contact, moving contact, and rear conductive rod to form a path; when the core electrode 5 separates from the charged body, an electric arc is generated between the stationary and moving contacts.

[0036] The vacuum interrupter 41 uses a ceramic shell and has a high vacuum environment inside (vacuum degree ≤ 1.33 × 10⁻⁶). - With a strength of 3Pa, it possesses excellent insulation properties and arc-extinguishing capabilities, effectively preventing burns or damage to operators and equipment caused by electric arcs.

[0037] To further suppress arc reignition, the vacuum interrupter 41 is also filled with gas-generating arc-extinguishing materials, such as nylon or melamine. The gas-generating arc-extinguishing materials work in conjunction with the vacuum interrupter 41 to generate inert gas during arc extinguishing to suppress arc reignition. The high temperature of the electric arc causes it to decompose and generate inert gas, thus enhancing the arc extinguishing effect.

[0038] Meanwhile, the arc suppression component 4 is also equipped with an arc voltage detection unit. This unit monitors the arc voltage changes during the contact or separation process of the core phase electrode 5 in real time. When an abnormal increase in arc voltage is detected, it quickly feeds back to the control module (existing technology, which can be set outside the insulating protection body 1). The control module drives the operating mechanism of the vacuum interrupter 41 to operate, further ensuring that the arc is reliably extinguished in the shortest possible time, forming a multi-layered arc suppression guarantee mechanism. In addition, to improve the anti-interference capability in complex electromagnetic environments, the vacuum interrupter 41 is wrapped with a metal shielding layer. This shielding layer can not only effectively block external electromagnetic radiation from interfering with the internal operation of the interrupter, but also confine the electromagnetic pulse generated during the arc extinguishing process to the inside of the device, avoiding electromagnetic influence on surrounding equipment and personnel.

[0039] In this embodiment, the arc-extinguishing capacity of the vacuum interrupter 41 is ≥20kA, which meets the requirements for handling short-circuit currents in a 10kV power system. Its interior employs a high-vacuum design, achieving a vacuum level of up to 10 kA. -4 The pressure above Pa provides an ideal medium environment for the rapid extinguishing of the electric arc. Meanwhile, the contacts within the arc-extinguishing chamber are made of a copper-chromium alloy material with high conductivity and ablation resistance. This not only effectively reduces contact resistance and heat loss but also maintains good electrical performance and mechanical strength under frequent operation and short-circuit current impacts, significantly extending the service life of the vacuum arc-extinguishing chamber and ensuring its continuous and stable arc-extinguishing function during long-term nuclear phase operation.

[0040] To optimize the electric field distribution, the head of the phase-nucleating electrode 5 is designed in a spherical shape to reduce the possibility of tip discharge. The insulation level of the device of this invention has passed the 42kV / 1min power frequency withstand voltage test, and the protection level reaches IP65. The spherical head design makes the electric field intensity distribution around the phase-nucleating electrode 5 more uniform, avoiding air ionization discharge caused by excessively high local field strength, thereby ensuring the safety of phase-nucleating operation. The 42kV / 1min power frequency withstand voltage test results show that the device has sufficient insulation capability to withstand overvoltages that may occur in a 10kV power system, ensuring that no insulation breakdown or other faults will occur during phase-nucleating. The IP65 protection level means that the device casing can completely prevent dust intrusion and will not be damaged by water spraying from any direction. This allows this phase-nucleating dedicated anti-discharge protection device to adapt to various complex outdoor operating environments. Whether it is a dusty industrial plant or a rainy and humid outdoor location, it can maintain a stable and reliable operating state, effectively protecting the internal precision components from the influence of external environmental factors.

[0041] The operating method of this device includes the following steps: First, the operator puts on an equipotential suit and connects the metal shielding layer 21 of the equipotential shielding component 2 to the equipotential suit via a grounding wire 22, ensuring that the grounding resistance is ≤10Ω, forming a reliable equipotential connection and grounding circuit. Second, the phase-matching electrode 5 is installed on the insulating protective body 1, and the status of the fuse in the overvoltage absorption component 3 is checked to ensure that the mechanical alarm indication (existing technology) has not been triggered. During the phase-matching operation, the operator holds the insulating protective body 1 and slowly approaches the head (spherical design) of the phase-matching electrode 5 towards the 10kV live conductor. The moment the phase-matching electrode 5 contacts or leaves the live conductor, the vacuum interrupter 41 in the arc suppression component 4 quickly activates (arc extinguishing time ≤5ms), introducing the generated arc into it and extinguishing it in the vacuum. At the same time, the surrounding gas-generating arc-extinguishing material decomposes upon heating to produce inert gas, further enhancing the arc extinguishing effect and preventing arc reignition. During this process, if an operational overvoltage occurs, the zinc oxide valve 31 (MOV) of the overvoltage absorption component 3 immediately conducts, clamping the overvoltage amplitude to a safe level (for a 10kV system, the operational impact residual voltage is ≤45kV). If the zinc oxide valve 31 breaks down due to deterioration or overload, the series-connected fuse quickly melts, cutting off the fault circuit and triggering a mechanical alarm indication, reminding the operator to replace the overvoltage absorption module in time. Throughout the phase verification process, the three-layer epoxy resin insulation cover (creepage distance ≥400mm) of the insulation protection body 1 ensures sufficient insulation strength, and together with the equipotential shielding component 2, suppresses the induced voltage to below 23V (far below the 50V safe voltage). Multiple protection mechanisms work together to ensure the safety of 10kV manual phase verification operations.

[0042] Preferably, the 10kV artificial phase-matching discharge protection device also includes an insulating rod 6, one end of which is connected to the end of the insulating protection body 1 furthest from the phase-matching electrode 5, and the axial direction of the insulating rod 6 is along the axial direction of the insulating protection body 1. When the insulating rod 6 is needed, it is plugged into the insulating protection body 1. The insulating protection body 1 has a socket 61 at its end for inserting one end of the insulating rod 6. After one end of the insulating rod 6 is inserted into the socket 61, the connection between the insulating rod 6 and the insulating protection body 1 is achieved. When not in use, the two can be disassembled and separated.

[0043] A non-slip insulating rubber sleeve is fitted over the grip area of ​​the insulating rod 6. The surface of the rubber sleeve has raised diamond-shaped patterns, which can effectively increase the friction between the hand and the insulating rod, preventing the device from slipping and falling off during operation. At the same time, the rubber material itself can also further improve the insulation protection during operation. In addition, a hanging ring is provided at the end of the insulating rod 6 away from the insulating protection body 1. When the device is not in use or needs to be carried, it can be conveniently hung on a tool rack or hook through the hanging ring, saving storage space and making it easy to access.

[0044] Preferably, the insulating rod 6 is a telescopic rod, capable of extending and retracting to adjust its length, thus allowing for flexible use by staff. The placement of the socket does not affect the overvoltage absorption component 3.

[0045] The insulating rod 6 is made of high-strength fiberglass, possessing excellent mechanical strength and insulation properties. Its surface is treated with an anti-slip coating to ensure a stable grip for the operator. The telescopic adjustment structure of the insulating rod 6 employs a two-section nested sleeve design. Each sleeve is fixed in length by an internal elastic locating pin. Adjustment is achieved by simply pressing the locating pin, allowing for extension or retraction within a range of 1 meter or longer to meet safety distance requirements in various working environments. The insertion hole 61 is a threaded hole; one end of the insulating rod 6 can be screwed into the insertion hole, making connection between the two convenient.

[0046] The overvoltage absorption component 3 and the socket 61 are arranged to avoid each other on the insulating protection body 1. The socket 61 is located at the middle of one end of the insulating protection body 1, and the position of the socket 61 does not affect the voltage absorption component 3.

[0047] This invention provides a 10kV artificial phase fusion-specific anti-discharge protection method, comprising the following steps: Step S1: Assemble the insulating protective body 1 with the nuclear phase electrode 5, and ground the metal shielding layer 21; Step S2: Suppress the induced voltage generated during nucleation to a safe threshold using the equipotential shielding component 2; Step S3: At the instant the nuclear phase electrode 5 contacts or separates from the charged body, the arc is quickly extinguished by the arc suppression component 4; Step S4: When an operational overvoltage occurs, the overvoltage energy is absorbed by the overvoltage absorption component 3, limiting the overvoltage amplitude to a safe range.

[0048] Preferably, step S5 is also included: according to the safety distance requirements of the working environment, the length of the insulating rod 6 is adjusted to a suitable size by adjusting the telescopic structure of the insulating rod 6, and then one end of the insulating rod 6 is screwed into the insertion hole 61 of the insulating protective body 1 to complete the overall assembly of the device. It also includes step S6: The operator holds the non-slip insulating rod 6 and makes the phase nucleation electrode 5 contact the charged body to perform phase nucleation operation. During the operation, the working status of each component is monitored in real time to ensure that the equipotential shielding, arc suppression and overvoltage absorption functions are functioning properly. It also includes step S7: After the phase nucleation operation is completed, the phase nucleation electrode 5 is first removed from the charged body. After confirming that there is no residual induced electricity, the grounding wire of the metal shielding layer 21 is removed. Then, the insulating rod 6 and the insulating protective body 1 are disassembled in sequence. The device is cleaned and stored in a dry and ventilated special toolbox.

[0049] Specifically, in the above-mentioned anti-discharge protection method, the operator checks the integrity of the device, reliably connects the insulating protection body 1 and the phase electrode 5, measures the ambient humidity to ensure it is ≤85%, connects the grounding wire 22 of the equipotential shielding component 2 to the field grounding grid, and uses a grounding resistance tester to confirm that the grounding resistance is ≤10Ω.

[0050] Specifically, in the above-mentioned anti-discharge protection method, when approaching the device under test, the metal shielding layer 21 of the equipotential shielding component 2 first couples with the possible induced electric field, and discharges the induced electric energy through the grounding circuit to ensure that the potential of the core phase electrode 5 relative to ground is always within a safe range, thus preventing electric shock accidents.

[0051] Specifically, in the above-mentioned anti-discharge protection method, when the operator holds the nuclear phase electrode 5 to contact the point to be tested (such as the T-type head of the transformer substation), if a small electric arc occurs at the moment of contact, the vacuum interrupter 41 of the arc suppression component 4 will cut off the arc within milliseconds to avoid the arc burning the operator and the equipment.

[0052] Specifically, in the above-mentioned anti-discharge protection method, at the moment when the phase-comparison electrode 5 contacts or disconnects, the power system may generate an operational overvoltage. At this time, the zinc oxide valve plate 31 in the overvoltage absorption component 3 responds quickly, clamping the overvoltage amplitude below 1.2Un (rated voltage), protecting the insulation protection body 1 from being broken down, and also protecting the downstream phase-comparison instrument.

[0053] Specifically, in the above-mentioned anti-discharge protection method, if the zinc oxide valve plate 31 inside the overvoltage absorption component 3 fails and short-circuits, the series-connected fuse will immediately blow, physically disconnecting the circuit and triggering a mechanical alarm. Upon detecting the alarm, the operator should stop operation and replace the module. After the work is completed, close the grounding switch and wait at least 3 minutes to ensure that the residual charge is discharged to a residual voltage ≤50V before removing the device.

[0054] Through the combination of the above methods and devices, in the actual application of the new 10kV box-type substation project, the effects of zero sensing of induced current, no discharge phenomenon, and phase measurement error of only 0.2° were successfully achieved. The operation time was shortened from 2 hours of traditional methods to 45 minutes, which significantly improved the safety and efficiency of the operation.

[0055] The beneficial effects of the 10kV artificial phase fusion special anti-discharge protection device and method provided by the present invention are as follows: Compared with the prior art, firstly, by integrating the equipotential shielding component 2, the overvoltage absorption component 3, and the arc suppression component 4, the three major functional modules of equipotential shielding, overvoltage absorption, and rapid arc extinguishing are realized, which systematically solves the three core safety risks of induced electricity, operating overvoltage, and arc burns in the phase fusion operation process, reducing safety hazards by more than 90%.

[0056] Secondly, the metal shielding layer 21 effectively suppresses external electromagnetic interference, which improves the phase measurement accuracy from ±5° of the traditional method to within ±0.5°. At the same time, due to the significant improvement in operational safety, operators are more confident in their operation and the process is smoother, which can shorten the time of a single phase comparison operation from 2 hours to within 45 minutes, improving efficiency by more than 50%.

[0057] Third, the overall insulation level of the device of the present invention meets the requirements of the 10kV power system. Through grounding interlocking and overvoltage absorption component 3, new risks such as secondary discharge or short circuit are avoided, ensuring the inherent safety of the device.

[0058] Fourth, the protection level can reach IP65, which can adapt to the operation requirements under harsh weather conditions such as high humidity (≤85%).

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 10kV artificial phase comparison dedicated anti-discharge protection device, used in conjunction with a phase comparison instrument, characterized in that, include: An insulating protective body has a core phase electrode connected to one end, which is used to contact a charged body and collect electrical signals. An equipotential shielding assembly includes a metal shielding layer disposed outside the insulating protective body, the metal shielding layer being grounded to suppress induced voltage to below a safe threshold. An overvoltage absorption component is disposed inside the insulating protection body and electrically connected to the core phase electrode. The overvoltage absorption component includes a zinc oxide valve plate for absorbing operational overvoltages. An arc suppression assembly includes a vacuum interrupter chamber, which is configured to cooperate with the contact end of the core phase electrode for rapidly cutting off the generated arc when the core phase electrode contacts or separates from it. A signal transmission interface is used to electrically connect to the nuclear phase electrode and to transmit the signal collected by the nuclear phase electrode to the phase comparator.

2. The 10kV artificial phase nucleation dedicated anti-discharge protection device as described in claim 1, characterized in that, The insulating protection body adopts a three-layer epoxy resin insulating cover structure, and its creepage distance is set according to the voltage level.

3. The 10kV artificial phase nucleation dedicated anti-discharge protection device as described in claim 2, characterized in that, The creepage distance for 10kV power systems is ≥400mm, and the creepage distance for 35kV power systems is ≥1000mm. The grounding resistance of the metal shielding layer is ≤10Ω.

4. The 10kV artificial phase nucleation dedicated anti-discharge protection device as described in claim 1, characterized in that, The nuclear phase electrode is a spherical electrode, used to reduce the electric field concentration effect.

5. The 10kV artificial phase nucleation dedicated anti-discharge protection device as described in claim 1, characterized in that, The overvoltage absorption assembly also includes a fuse connected in series with the zinc oxide valve plate. The fuse is used to disconnect the circuit and trigger a mechanical alarm indication when the zinc oxide valve plate fails.

6. The 10kV artificial phase nucleation dedicated anti-discharge protection device as described in claim 1, characterized in that, The arc suppression assembly also includes a gas-generating arc-extinguishing material, which works in conjunction with the vacuum arc-extinguishing chamber to generate inert gas during arc extinguishing to suppress arc reignition.

7. A 10kV artificial phase nucleation-specific anti-discharge protection device as described in claim 1, characterized in that, The arc extinguishing time of the vacuum arc extinguishing chamber is ≤5ms, and the arc extinguishing capacity is ≥20kA.

8. A 10kV artificial phase nucleation-specific anti-discharge protection device as described in claim 1, characterized in that, The 10kV artificial phase comparison dedicated anti-discharge protection device also includes: An insulating rod is connected at one end to the end of the insulating protective body away from the nuclear phase electrode, and the axial direction of the insulating rod is along the axial direction of the insulating protective body.

9. A method for preventing discharge of 10kV artificial phase synchrotrons using a 10kV artificial phase synchrotron discharge protection device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Assemble the insulating protective body with the nuclear phase electrode, and ground the metal shielding layer; Step S2: Suppress the induced voltage generated during nucleation to a safe threshold using the equipotential shielding component; Step S3: At the instant the nuclear phase electrode contacts or detaches from the charged body, the arc is quickly extinguished by the arc suppression component; Step S4: When an operational overvoltage occurs, the overvoltage energy is absorbed by the overvoltage absorption component, limiting the overvoltage amplitude to a safe range.

10. A 10kV artificial phase nucleation-specific anti-discharge protection method as described in claim 9, characterized in that, It also includes the step of automatically disconnecting the circuit and issuing a mechanical alarm via a built-in fuse when the overvoltage absorption component fails.

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