64 results about "Ultra high voltage" patented technology

This application relates to the field of insulated switch application technology, and particularly to a method and apparatus for characterizing partial discharge features in ultra-high voltage direct current (UHVDC) GIS. The method includes: generating a partial discharge pulse sequence based on the light signals generated by electroluminescence and gas ionization emission in the UHVDC gas-insulated switchgear; generating a spectrum of at least one parameter pair based on the amplitude and corresponding time of the partial discharge pulses; and generating a feature fingerprint map of at least one parameter pair based on the spectrum. The method also involves extracting at least one statistical feature from the kernel density sequence of the at least one parameter pair based on the feature fingerprint map, and generating a characterization result of the partial discharge feature based on the at least one statistical feature. This solves the problem that partial discharge detection is easily affected by electromagnetic interference, mechanical vibration, and environmental noise, making it difficult to effectively extract and accurately identify the actual partial discharge signal, thus affecting the accuracy and reliability of the detection results.

This invention discloses an ultra-high voltage cable with an aluminum-pressed sheath, relating to the field of cable technology. It includes an outer sheath, inside which a cable core is installed. An insulating shielding sleeve is fitted over the outer wall of the cable core. An inner nesting sleeve is fitted over the outer side of the insulating shielding sleeve. A reinforcing strip is symmetrically wound around the outer wall of the inner nesting sleeve. Several arc pads are installed at equal angles along the circumferential direction on the outer side of the reinforcing strip. A support sleeve is fitted over the outer side of each arc pad. This invention effectively integrates spiral limiting, multi-dimensional gradient buffering, flexible protection, and rigid support. It not only forms multiple radial and axial stress relief networks, achieving multi-level stress dispersion and efficient buffering of mechanical stress, providing reliable flexibility for ultra-high voltage cables, but also forms a radially dominant, multi-axially auxiliary heat conduction network while ensuring mechanical strength, effectively improving the cable's heat dissipation capacity and simultaneously meeting the cable's requirements for mechanical strength and heat dissipation performance.

The utility model discloses a kind of superhigh voltage multicore photoelectric composite six types of data cable, including electric conductor, photoelectric subarea pipe sleeve, optical fiber, wrap layer, insulating layer, heat insulation layer, protective layer, outer armor, the electric conductor is installed in photoelectric subarea pipe sleeve inside, the optical fiber is installed in photoelectric subarea pipe sleeve inside, the wrap layer is wrapped in photoelectric subarea pipe sleeve side end, the insulating layer is coated in wrap layer side end, the heat insulation layer is coated in insulating layer side end, the protective layer is coated in heat insulation layer side end, the outer armor is coated in protective layer side end. The utility model solves the superhigh voltage multicore photoelectric composite six types of data cable when using, copper core of cable carries current and is easy to produce local hot spot, produces local overheating. When cable laying or running is subjected to vibration, bending, optical fiber is prone to stress concentration due to local increase and even breakage problem of attenuation.

The present application provides a kind of based on multi-source data fusion's ultra-high voltage line mountain fire prediction method, this method first constructs multiple parallel training systems, based on consistent data and model architecture, different training parameters complete training, screen five network parameters of optimal precision for actual prediction system;Again satellite original drawing, ultra-high voltage camera original drawing and two kinds of image cross-time difference graph are collected four kinds of pixel data, respectively input network model 1, network model 2, network model 3 and network model 4 extract features and output probability;Finally, the probability value is combined as feature vector input fusion network, and the final mountain fire classification result is output.The proposed ultra-high voltage line mountain fire prediction method solves the problem of traditional prediction relying on single data, incomplete feature extraction, low precision in complex scene, realizes multi-source feature deep fusion and multi-network collaborative prediction, optimizes feature capture and model generalization ability, and improves the accuracy and reliability of ultra-high voltage line mountain fire prediction.

This invention belongs to the field of power semiconductor technology and relates to an MCT series pulse circuit. This invention employs a MOS-controlled thyristor with a cathode short-circuit structure, combining the simplicity of the MOSFET gate control circuit with the excellent surge current capability of the thyristor to provide high di / dt and high peak current. This invention uses a standard 1700V MCT device in series, combined with a voltage equalization circuit, to achieve static withstand voltage and dynamic voltage balance during MCT turn-on in an ultra-high voltage capacitive pulse circuit. Simultaneously, the drive signal output from the driver chip is transmitted to the MCT gate circuit via magnetic coupling, and then modulated by the MCT gate circuit to achieve synchronous transmission of the drive signal and synchronous conduction of the MCT, reducing the asynchrony of the series MCT turn-on and preventing voltage imbalance caused by inconsistent MCT turn-on, which could damage the device. The MCT series circuit in this invention has high synchronization and high cascading capability, allowing for multi-stage series connection to achieve ultra-high voltage series pulses.

This invention relates to the field of high-performance ceramic material preparation technology, specifically an ultra-high pressure discharge plasma sintering system, comprising a six-sided press body, a high-power DC pulse power supply, and a high-pressure synthesis assembly block. The six-sided press body has a frame providing ultra-high pressure and a hydraulic drive system. Its six carbide hammers together form a cubic space for placing the high-pressure synthesis assembly block containing the sample. The two poles of the high-power DC pulse power supply are respectively connected to two upper and lower large pads through two conductive copper strips. The ends of the two large pads are fitted with steel rings, and the ends of the steel rings are embedded with carbide hammers. This ultra-high pressure discharge plasma sintering system achieves rapid and uniform bulk heating of the sample. The synergistic effect of the two systems enables the densification sintering preparation of ultra-hard ceramics at temperatures far lower than those of traditional high-temperature and high-pressure methods in a short time.

The application discloses a kind of superhigh voltage substation construction environment multidimensional influence coordinated control method, it is related to superhigh voltage substation construction environment control technical field, it aims at solving the technical problem of low control precision and insufficient sealing reliability caused by the dynamic coupling interference of multidimensional environmental parameters when GIS equipment splicing of superhigh voltage substation in high-altitude heavy ice area, including the following steps: S1, construct splicing microenvironment multidimensional parameter perception module, collect the environmental pressure, SF6 gas characteristics, environmental temperature and humidity and splicing surface temperature core parameters of high-altitude heavy ice area superhigh voltage substation GIS equipment field splicing area;S2, based on the collected parameters, excavate the dynamic coupling interference law of each parameter under high-altitude low air pressure, and construct a coupled interference suppression multidimensional coordinated control model;S3, according to the model output, the linkage control instruction containing interference avoidance strategy has the advantages of accurate and stable splicing microenvironment and guaranteeing the sealing performance of equipment splicing.

The application belongs to the technical field of high-voltage power supply sampling monitoring, and provides an ultrahigh-voltage electron gun power supply photoelectric isolation sampling circuit and a sampling method. In view of the problems of low sampling accuracy, poor surge resistance and difficult maintenance of the existing electron gun power supply under a 150kV floating high-voltage environment, the application adopts three groups of signal processing and isolation channels with the same structure, which correspond to the output of the main high-voltage, the auxiliary high-voltage and the filament in a floating cascade structure. Each channel independently completes sampling and isolation under the corresponding floating potential. The circuit includes a power supply circuit, a sampling connection circuit, a current and voltage sampling base plate with an integrated multi-stage overvoltage clamping network, and a detachable and plug-in sampling processing circuit board, a photoelectric conversion circuit board and an optocoupler signal transmission plugboard. Through photoelectric isolation and modular design, the circuit effectively suppresses the spark surge interference, realizes high-precision and high-reliability sampling, supports plug-and-play, and significantly improves the system maintenance convenience and operation stability.

This application provides a transfer high-voltage control circuit and an image forming apparatus. The transfer voltage control circuit includes a transfer high-voltage circuit and a voltage clamping circuit. The transfer high-voltage circuit includes an operational amplifier circuit and a transformer. The input terminal of the voltage clamping circuit is connected to the transformer, and the output terminal of the voltage clamping circuit is connected to the input terminal of the operational amplifier circuit. The output terminal of the operational amplifier circuit is connected to the input terminal of the transformer. The transfer high-voltage circuit outputs a transfer output voltage. The voltage clamping circuit acquires a clamping input voltage from the transformer. If the transfer output voltage is determined to be in an overvoltage state based on the clamping input voltage, it outputs a clamping output voltage to the input terminal of the operational amplifier circuit to clamp the transfer output voltage, thereby preventing the transfer high-voltage circuit from outputting an excessively high transfer voltage.

The application provides a calculation method of contact resistance of an electric connection structure of a contact finger of an ultra / extra-high voltage GIS device. The method comprises the following steps: S1, capturing a gray-scale image of a contact area of the contact finger by using MATLAB and a laser confocal microscope, and determining a fractal dimension of the contact area of the contact finger according to the gray-scale image; S2, determining a critical contact area according to the fractal dimension of the contact area of the contact finger and a contact surface characteristic parameter; S3, determining a critical base length and a contact micro-protrusion base diameter according to the critical contact area; S4, calculating the area of a maximum micro-protrusion of the electric connection structure of the contact finger under different loads according to the critical contact area, the critical base length and the contact micro-protrusion base diameter; and S5, determining the contact resistance of the electric connection structure of the contact finger according to the area of the maximum micro-protrusion. In this way, the theoretical calculation of the contact resistance of the electric connection structure of the contact finger of the ultra / extra-high voltage GIS device can be realized, and the method has wide practicability and economy.

This invention discloses a semiconductive shielding material for ultra-high voltage DC cables, its preparation method, and its application. The material comprises 60-80 parts of a matrix resin, 5-15 parts of an MXene / graphene composite material, 10-30 parts of conductive carbon black, 0.5-10 parts of a lubricant, 0.1-2 parts of an antioxidant, and 0.1-5 parts of a crosslinking agent. In this invention, a MXene / graphene composite material with a designable interlayer structure is prepared by plasma exfoliation. Plasma breaks the C-O bonds in graphene oxide, reducing it to reduced graphene oxide (rGO). Due to the expansion caused by the breaking of C-O bonds, MXene is exfoliated to obtain an MXene / graphene / MXene "sandwich" structure. The two materials overlap to form a complete conductive network. This method is simple to prepare and effectively reduces agglomeration while increasing the specific surface area of ​​the composite material. No other organic or non-conductive molecules are introduced during the preparation process, thus improving the electrochemical performance of the material. The addition of this composite material can effectively uniformize the electric field, rapidly dissipate charges during power transmission and de-energization, improve power transmission safety, and at the same time reduce the amount of carbon black used, thereby improving the mechanical and processing properties of the semiconductive shielding material.

This invention discloses a method for monitoring the insulation of the sheath of ultra-high voltage long-distance submarine cables, belonging to the field of submarine cable technology. It includes deploying a first intelligent sensor device at the power supply end of the submarine cable and a second intelligent sensor device at the power receiving end. Both ends are synchronously sampled via GPS, and the data is uploaded to the main control room. The main control room equipment calculates the instantaneous value I. cx I dx I gd I fz The fundamental peak value is extracted by discrete Fourier transform to obtain the leakage ratio k. dc and circulation coefficient k gf According to k dc The value of k determines the insulation leakage of the sheath. gf The deviation from the reference indicates an abnormal grounding circuit, solving the technical problem of accurately monitoring the insulation of ultra-high voltage long-distance submarine cables online even in environments with strong electromagnetic interference. This invention only requires a current signal, does not require voltage measurement, is unaffected by electromagnetic interference, and can realize real-time online monitoring of insulation aging and leakage of submarine cables.

This utility model relates to the field of high-voltage connector technology and discloses an ultra-high-voltage quick connector that facilitates connection. It includes a female connector with a male connector inserted into it. Both the female and male connectors are equipped with a fixing mechanism. The fixing mechanism includes a locking ring, a mounting plate, and a turntable. The locking ring is fixedly sleeved on the outer wall of the male connector, and the mounting plate is fixedly sleeved on the outer wall of the female connector. After the male connector is inserted into the female connector, rotating the turntable causes an arc-shaped sliding hole to move a sliding rod. This causes the sliding rod to move a locking block along a rectangular sliding hole on the mounting plate and lock it onto the locking ring, achieving quick fixing of the female and male connectors. For disassembly, rotating the turntable in the opposite direction disengages the locking block from the locking ring, allowing the male connector to be pulled out. This quick fixing and separation can be achieved without screw tightening, solving the problem of inconvenient disassembly of traditional connectors and improving operational efficiency.

The application discloses an enhanced method for defect detection of an ultrahigh-voltage transmission line based on one-way LSTM online learning. The method comprises collecting an ultrahigh-voltage transmission line image and pre-processing the image; using an image segmentation algorithm to segment and extract a core area of the transmission line from the pre-processed ultrahigh-voltage transmission line image; using a feature extraction model to extract multi-scale features in the segmented image and fuse the features to obtain an initial defect map; inputting the initial defect map into a defect recognition model for defect detection to obtain a final defect map and performing threshold segmentation to obtain a defect area position, and combining a transmission line defect type feature to obtain a defect type and a confidence level. The application is aimed at the repetitive and linearly extended defects of the ultrahigh-voltage transmission line, uses time sequence dependence and an attention mechanism to improve precision and robustness, and through online self-adaption, light weight and explainable design, realizes dynamic optimization, low-power deployment and traceability, and balances performance, flexibility and practicability.

The present invention relates to the field of polymers, and specifically to a polyethylene and an application thereof, a polyethylene composition, and a crosslinked polyethylene insulating cable material. The polyethylene has 10-20 tertiary carbon atoms per 1000 carbon atoms and 0.1-0.2 vinyl groups per 1000 carbon atoms. The polyethylene of the present invention can improve the scorch resistance and heat resistance of the crosslinked polyethylene insulating cable material, thereby obtaining an ultrahigh-voltage cable applicable to 330 kV and above.

This application relates to a semiconductive shielding material composition based on an ion-conductive elastomer, the semiconductive shielding material itself, a method for preparing the same, and cables. The semiconductive shielding material composition based on an ion-conductive elastomer includes: an ion-conductive elastomer, conductive carbon black, a matrix resin, a lubricant, an antioxidant, and a crosslinking agent; the ion-conductive elastomer comprises an organic polymer and an imidazolium salt having the structure of Formula I dispersed in the organic polymer; in Formula I, R1 represents an alkyl group with 1-5 carbon atoms, R2 represents an alkyl group with 3-30 carbon atoms, and X is a halogen; the organic polymer has a branched structure, and the branched structure includes at least one of carboxyl and cyano groups. This application, by introducing an ion-conductive elastomer into the semiconductive shielding material composition, improves the flexibility and ductility of the shielding material, thereby improving the mechanical properties of the semiconductive shielding material. When applied to cables, especially high-voltage and ultra-high-voltage cables, it can significantly extend service life. Formula I

The present invention relates to an automated system (100) and an automated method (300) for controlled surface removal of defects on cast metal anodes (110) prior to electrorefining, including anodes of copper, nickel, lead, or other electrochemically refinable metals. The system comprises a detection system (130), a surface removal head (140), a surface removal module or tool (141), a relative displacement system (150), a control unit (170), and optionally, a collection or extraction system (160). The control unit (170) obtains surface information from the anode, determines a surface conditioning zone (120), commands general surface removal, and subsequently determines localized zones with surface defects or residual contaminants (121) for selective surface removal.The surface removal module or tool (141) may comprise a mechanical tool, an abrasive tool, a pressure water nozzle, a very high pressure water nozzle, or a combination thereof, including cleaning with water without added abrasive. In one embodiment, the system integrates milling or conditioning of upper lugs (112) to prepare electrical contact surfaces prior to electrorefining.

The application provides an online ultrasonic evaluation method for the crosslinking degree of an insulating material of an ultra-high voltage cable, comprising: collecting ultrasonic reflection signals covering a 0.5-15 MHz frequency band and a sampling rate not lower than 20 MHz and synchronously collecting process parameters, extracting multi-dimensional fractal features through variational mode decomposition; constructing a cross-scale causal knowledge graph based on molecular structures, crosslinking networks and process parameters, realizing fractal feature attribution distribution through a graph neural network, and quantitatively evaluating the contribution of causal paths to crosslinking degree prediction by using an improved SHAP value, and realizing a three-dimensional visual and interpretable report, wherein the application can dynamically optimize the knowledge graph, improve the accuracy of crosslinking degree prediction and the scientificity of process control, and enhance the evaluation interpretability and production adaptability.

The utility model provides a kind of ultrahigh pressure MOSFET terminal structure, above-mentioned terminal structure includes: substrate, it is in and set up main knot and VLD knot, the depth of the VLD knot gradually becomes smaller along the direction away from the main knot;Oxide layer is located on the substrate;Polysilicon field plate is located on the oxide layer;Dielectric layer is located on the polysilicon field plate;And metal field plate is located on the dielectric layer.The utility model embodiment is changed by setting VLD knot and its depth, and is matched with polysilicon field plate and metal field plate, while guaranteeing high pressure resistance, so that terminal structure is shorter, cost is less, and reliability is higher.

This invention discloses a silicone rubber insulation material for ultra-high voltage DC cable accessories, its preparation method, and its application, belonging to the field of power cable system insulation technology. This invention solves the problems of poor electrical resistance of existing silicone rubber insulation materials for cable accessories, and the susceptibility of partial discharge to reinforcing insulation in cable accessories, leading to high failure rates. This invention uses 4-propenoxy-2-hydroxybenzophenone as a partial discharge inhibitor and xylene as a solvent, employing a special blending process to achieve uniform dispersion of the partial discharge inhibitor in a two-component liquid silicone rubber. This fully utilizes the function of the partial discharge inhibitor, resulting in a silicone rubber material with excellent electrical resistance. Partial discharge is less likely to occur even under stronger electric fields, making the resulting insulation material suitable for reinforcing insulation of ultra-high voltage DC cable accessories.

The application discloses a kind of for superhigh voltage active power system and its use method, it is aimed at solving the deficiency of traditional series standby switching scheme.The application includes cascaded H bridge main circuit, parallel standby unit, control unit and the auxiliary power supply unit for providing power supply for parallel standby unit, wherein, cascaded H bridge main circuit is composed of several cascaded modules in series, cascaded H bridge main circuit is divided into M groups N cascaded modules, parallel standby unit includes standby module with the same structure as sub-module, standby module is in hot standby state by auxiliary power supply unit power supply, the positive and negative DC terminals of each cascaded module in group are respectively connected in parallel with standby module by high-speed switch, control signal is provided to standby module according to the fault state of cascaded module, system is switched to standby module quickly when fault occurs, avoid the problem of system output voltage imbalance and current and voltage impact, make standby module one-to-many working module, so as to improve the utilization of standby module.

This application relates to the field of power transmission equipment monitoring technology, and particularly to a method and apparatus for detecting insulation defects in ultra-high voltage direct current (UHVDC) GIS. The method includes: acquiring photon counting signals and ultra-high frequency (UHF) signals from the gas-insulated metal-enclosed switchgear (GIS); determining whether the photon counting signal meets preset warning conditions; if the photon counting signal meets the preset warning conditions, then denoising and discretizing the UHF signal to obtain corresponding UHF data; generating feature maps of multiple parameter pairs based on the UHF data; and using the feature maps as an index to query a preset partial discharge feature fingerprint database to obtain the insulation defect detection results of the GIS. This solves the problem in related technologies where low-level electric field distortion caused by micro-defects or initial defects makes it difficult to detect insulation degradation in GIS in a timely manner, resulting in insufficient detection sensitivity and timeliness.

The application provides a vertical floating and resistive field plate terminal silicon carbide IGBT device and a preparation method, a vertical groove type metal-insulator-semiconductor (MIS) structure is introduced in a cell terminal area, a multi-region junction terminal expansion / multi-floating field limiting ring / half-insulating polysilicon SIPOS resistance field plate technology is combined, and a high-efficiency super-high-voltage silicon carbide IGBT device terminal is realized: in a blocking state, the resistance field plate performs lateral voltage division, the groove type MIS structure keeps the same potential with the half-insulating polysilicon connected with the resistance field plate, the device front Ptop multi-region junction terminal expansion and Pshield multi-floating field limiting ring structure are combined to modulate the body and surface electric field, the terminal area is continuously and fully depleted, the main junction electric field concentration is relieved, and the area occupied by the terminal area is reduced. Under the premise of ensuring the high-efficiency terminal of the groove type silicon carbide IGBT device, the high breakdown voltage and the reliability of the oxide layer are maintained.

The application discloses a kind of superhigh pressure large capacity three-core submarine cable, belong to submarine cable technical field, it includes three conductive cores, two optical cable lines, rubber-coated tape layer, PP rope inner lining, armored layer, PP rope outer lining and protective glue layer, protective glue layer is peripherally arranged in PP rope outer lining, PP rope outer lining is peripherally arranged in armored layer, armored layer is peripherally arranged in PP rope inner lining, PP rope inner lining is peripherally arranged in rubber-coated tape layer, rubber-coated tape layer is by rubber-coated tape and is wound around the periphery of three conductive cores and two optical cable lines, and filling strip is arranged between three conductive cores and two optical cable lines;Conductive core includes water-blocking conductor, conductor shield layer, insulating layer, insulating shield layer, semi-conductive water-blocking binding tape layer, alloy lead sleeve and PE outer sheath from inside to outside.The application has the characteristics of good mechanical properties, optimized insulation performance, enhanced corrosion resistance and anti-bioadhesion capacity, and improved intelligent monitoring function.

A cable connection site management method according to the present invention comprises: a project input step of receiving project information about a cable connection project from a first terminal of a first user; a result input step of receiving a writing result for a checklist and / or a construction quality checklist from a second terminal of a second user; a payment step of receiving, from the first terminal, payment information for the writing result; and a display step of displaying, on a third terminal of a third user in real time, various types of information input in relation to the cable connection project. The cable connection site management method and a computer program, according to the present invention, can improve efficiency of an ultra-high voltage cable connection site management method, minimize management errors, and provide a basis for enabling conversion of the current analog site management into digital site management.

The application relates to the field of high-voltage transformers, and discloses a low-noise full-insulation super-high-voltage transformer which comprises a transformer body, first protection structures arranged on the front and back sides of the transformer body, and second protection structures arranged on the left and right sides of the transformer body. The first protection structures and the second protection structures can play a safe protection role at the transformer in the open air, and when it is necessary to maintain parts on the transformer, first protection fences supporting the first protection structures and second protection fences supporting the second protection structures are started, so that maintenance workers can directly stand on the first protection fences and the second protection fences, the maintenance work on the transformer is greatly facilitated, the first protection structures and the second protection structures can not only play a safe protection role, but also can assist the maintenance work of the maintenance workers, the work difficulty is reduced, and the structure is simple and the function is practical.

This invention discloses an ultra-high voltage control circuit, a high voltage controller, and a compressor, including a low-voltage input module, a high-voltage input module, a compressor drive module, and a bus capacitor module. The compressor drive module is electrically connected to the low-voltage input module, the high-voltage input module, and the bus capacitor module. The low-voltage input module includes a low-voltage battery and an ECU controller. The high-voltage input module includes a high-voltage power supply and a pre-charging circuit. The compressor drive module includes an isolation converter, a communication module, a main control MCU, and a SiC drive unit, etc. The SiC drive unit drives a three-phase half-bridge circuit. The bus capacitor module is electrically connected to the high-voltage input module and the three-phase half-bridge circuit of the SiC drive unit. It adopts a parallel structure of thin-film capacitors. The topology of the SiC drive unit is a half-bridge circuit, a high-side isolated drive, and a low-side intelligent drive. Bootstrap power supply realizes high-side floating ground power supply. The circuit structure is simple, the layout is reasonable, the circuit complexity is reduced, and the layout space is saved.

The present disclosure relates to a direct-current power cable system. More specifically, the present disclosure relates to a direct-current power cable system capable of preventing or minimizing electric field distortion due to a local electric field concentration and insulation breakdown of a cable joint box by alleviating the electric field of a portion where space charges are excessively accumulated inside a sleeve member of an intermediate connection structure of an ultra-high voltage direct-current power cable.