1353 results about "High-voltage cable" patented technology

The invention relates to the technical field of cable partial discharge detection and diagnosis, provides a high-voltage cable multi-parameter intelligent diagnosis method, system and equipment and a storage medium, and aims to solve the problems of low accuracy and poor reliability of high-voltage cable multi-parameter diagnosis caused by multiple factors. The method comprises the following steps: decomposing a partial discharge signal after interference filtering, extracting a time domain amplitude change rate and an energy distribution parameter, and generating a multi-dimensional time-frequency domain feature vector; calibrating a multi-dimensional time-frequency domain feature vector, carrying out nonlinear manifold mapping, generating a low-dimensional feature vector matched with dielectric spectrum characteristics, matching a partial discharge type with the highest similarity with an identification result, judging an insulation degradation level in combination with a final loss threshold interval, and generating a comprehensive diagnosis report. According to the invention, the ultrahigh-frequency sensor array captures the partial discharge signal matched with the dielectric spectrum, precise identification of the discharge type and dynamic evaluation of the insulation degradation level are realized through multi-scale analysis and deep learning fusion, and the reliability of high-voltage cable diagnosis is improved.

Disclosed in the present invention are a dual-end monitoring-based partial discharge source localization method and system for high-frequency partial discharge of a high-voltage cable. The method comprises: acquiring operation data and phase velocity test data of a high-voltage cable; when a partial discharge fault occurs in the high-voltage cable, collecting partial discharge signals on two sides of the high-voltage cable by means of sensors on the two sides of the high-voltage cable; performing Fourier transform respectively on the basis of the partial discharge signals on the two sides to obtain amplitude-frequency characteristics of the partial discharge signals, and preprocessing the collected partial discharge signals on the basis of the amplitude-frequency characteristics to optimize and improve a phase difference algorithm; and by incorporating the phase velocity test data of the high-voltage cable, using the improved phase difference algorithm to perform partial discharge source localization on the faulty cable. In the present invention, dual-end monitoring is used to reduce the attenuation of signals caused by long-distance transmission, and synchronization of two sensors is performed using a PTP protocol, effectively reducing errors; and in addition, during monitoring, partial discharge source localization is performed using the improved phase difference algorithm, which is conducive to resisting external interference, and there is no need to determine the time of arrival, greatly improving the positioning accuracy.

The invention discloses a comprehensive online monitoring system for a high-voltage cable of an electrified railway, and particularly relates to the technical field of cable monitoring. The clustering analysis module divides similar groups based on factory and use environment data; the prediction mode selection module evaluates the stability and nonlinearity degree of the environmental data, and selects an optimal prediction method to predict the environmental data; the threshold value judgment module selects a fixed or dynamic threshold value to judge a fault through comparison with similar group data; the dynamic adjustment module optimizes a fault threshold based on historical data and improves the detection precision; the alarm module triggers early warning when the monitoring data exceed a threshold value; according to the method, the operation mode of the cable is accurately matched, the monitoring precision is improved, misjudgment caused by a single data source is avoided, it is ensured that the optimal prediction method is always used under different environmental conditions, the prediction precision of future environmental data is improved, and reliable support is provided for fault judgment.

The invention relates to the field of high-voltage cable fault diagnosis, and discloses a high-voltage cable insulation fault intelligent diagnosis method and system based on multi-information fusion, and the method comprises the following steps: S1, obtaining the operation multi-source data of a high-voltage cable, and constructing a multi-source original data matrix; s2, preprocessing to obtain a time-space aligned standardized data matrix; s3, performing feature extraction to obtain a multi-dimensional feature vector, and learning internal association between features by using a multi-modal deep network to obtain a joint multi-modal feature; s4, constructing a fault type identification model based on Bayesian reasoning and Monte Carlo sampling, and obtaining a fault type classification result; s5, in combination with deep learning and a physical model, obtaining a fault occurrence interval, positioning information and a fault level; and S6, based on a fault type classification result, a fault occurrence interval and positioning information, obtaining a fault level, and carrying out early warning pushing on a generated diagnosis report. According to the invention, high-precision identification, positioning and risk assessment of high-voltage cable insulation faults are realized.

The invention discloses a high-voltage cable operation state on-line monitoring, intelligent early warning and fault positioning system, particularly relates to the technical field of power equipment insulation monitoring, and is used for solving the problems that transient discharge signals generated in the cable insulation degradation process are difficult to effectively capture and accurate fault positioning cannot be realized in the prior art. The method comprises the following steps: collecting transient leakage current signals and traveling wave propagation characteristic parameters, performing phase correlation analysis on leakage current pulses and power frequency voltage to identify discharge types, and performing variational mode decomposition and Hilbert-Huang transform on the signals to respectively extract complexity characteristics and energy distribution characteristics; signal logic conflicts are judged by analyzing similarity and statistical distance among characteristics of a plurality of monitoring points, and collaborative diagnosis is started or traveling wave distance measurement is directly utilized to carry out insulation state evaluation and fault location. And finally, differential early warning levels are generated according to the diagnosis result, and fault line selection and positioning information is output to realize real-time monitoring, intelligent early warning and accurate positioning of the operation state of the high-voltage cable.

The invention discloses a high-voltage cable on-line safety monitoring and fault positioning system, and relates to the technical field of high-voltage cable monitoring, and the system comprises a data processing module which is responsible for the centralized processing and analysis of original data; the data acquisition module is responsible for acquiring cable operation data and surrounding environment data; the safety monitoring module is responsible for monitoring the operation state of the cable in real time and evaluating the safety risk of cable operation; the fault early warning module is responsible for receiving data generated by the safety monitoring module; the fault positioning module is used for positioning the occurrence position of a cable operation fault; the operation and maintenance management module is responsible for coordinating maintenance resources and plans; and the client provides a visual interface. According to the invention, the cable operation fault can be predicted in advance, and the accuracy of fault positioning can be improved by generating multi-stage early warning information and optimizing the original signal through wavelet change.

A method for testing sheath impedance in a high-voltage cable cross-bonding system. Three-phase current data and three-phase grounding circulating current data from a first cable body segment and a last cable body segment in cross-bonding units, and three-phase current data, three-phase grounding circulating current data, and three-phase induced voltage data from a cable body at a cross-bonding box are detected and collected, thereby directly calculating three-phase sheath impedance of the three cable segments and determining whether the three-phase sheath impedance is abnormal (step 5), thus determining whether the tested cross-bonding units have a defect. The present invention involves a simple operation, achieves an accurate testing result, and can achieve energized testing without an external excitation source. By performing real-time testing on the cross-bonding units and calculating the sheath impedance of the three cable segments in the cross-bonding units in real time, the states of the cross-bonding units can be determined in real time, which makes it possible to detect a cable fault immediately, thereby preventing a loss caused due to the cable fault.

The invention relates to the technical field of cable fault diagnosis and positioning, in particular to a cable fault positioning method and system based on multi-source data space-time correlation, and the method comprises the steps: obtaining partial discharge, traveling wave and temperature multi-source monitoring data from a high-voltage cable-overhead line hybrid power transmission network; on the basis of space-time correlation analysis of partial discharge and temperature data, heat-electricity associated defect points are calibrated; comparing traveling waves of the cable and the overhead line, and identifying and inhibiting cross-domain propagation interference; positioning the traveling wave data which are not identified to obtain temporary coordinates, judging fault characteristics by fusing information such as sheath ring current and the like, and comparing the temporary coordinates with defect points to generate matching identification; and inputting multi-dimensional information such as fault features, defect matching identification and temperature into the fusion model, calculating the confidence coefficient of a fault mode, and outputting a cross validation positioning result. According to the invention, high-reliability positioning of mixed line faults and active early warning of insulation defects are realized by carrying out space-time correlation and fusion decision on multi-source monitoring quantities such as traveling waves, partial discharge, circulation, temperature and the like.

The invention discloses an overhead line-high voltage cable sheath lightning stroke induced voltage calculation method. At present, the voltage of a lightning stroke point, a connection point of an overhead line and a cable and a point in a well of each joint along a cable sheath cannot be obtained at the instantaneous moment of lightning stroke of the overhead line on site. According to the method, electromagnetic transient simulation modeling is carried out on actual spatial positions, structural parameters and material parameters of field overhead lines and high-voltage cables, electromagnetic transient simulation modeling is carried out on lightning currents, electromagnetic transient modeling is carried out on normal operation conditions and actual lightning stroke fault conditions of an electric power system, and after the randomness of the fault occurrence moment is considered, the electromagnetic transient simulation modeling is carried out on the actual lightning stroke fault conditions of the electric power system. And the maximum lightning stroke induced voltage value of each point along the cable sheath after lightning stroke is calculated through electromagnetic transient simulation software, so that a reference basis is provided for insulation matching design of the cable sheath of the overhead line-cable mixed line invaded by lightning current, and a foundation is laid for design evaluation of various subsequent voltage limiters and protectors.

The invention discloses a state evaluation and life prediction method for multi-source data fusion of a high-voltage cable. According to the method, a full-process technical scheme of acquisition, preprocessing, fusion, evaluation and prediction is constructed. In a multi-source data acquisition stage, full-dimensional data support is formed. In the data preprocessing stage, abnormal value mixed detection, missing value supplementation of physical rule constraints, data desensitization and feature preliminary screening are integrated. In the multi-source data fusion stage, strategies of feature-level fusion, federal learning and decision-level fusion are adopted. In the state evaluation stage, fuzzy comprehensive evaluation of dynamic weight and Bayesian correction is adopted, the state is accurately judged, and weak links are positioned. And in the life prediction stage, an improved prediction model is constructed, and dynamic correction and digital twinborn verification are combined to realize accurate prediction of the residual life. Accurate judgment of the state of the high-voltage cable and dynamic prediction of the service life can be achieved, and the lean management level of a power system on the high-voltage cable is effectively improved.

The invention relates to the technical field of power cable fault detection and positioning, in particular to a middle and high voltage cable insulation defect live detection and positioning method, which comprises the following steps: step 1, injecting a composite detection signal into a cable conductor through a signal injection device; 2, arranging signal acquisition devices at a plurality of preset point positions of the cable; step 3, carrying out adaptive processing on the acquired response signal; step 4, extracting insulation defect features from the response signals after adaptive processing; step 5, based on the extracted insulation defect features, classifying defect types by using a pattern recognition algorithm, and calculating defect positions based on a signal propagation time difference principle; and 6, outputting a defect identification and positioning result to a monitoring system, verifying, and if the deviation between the positioning result and historical data exceeds a threshold value, re-executing the steps 1 to 5. By combining a multi-point synchronous measurement technology and a precise space-time analysis method, the position where the defect occurs can be positioned more accurately.

An apparatus for cutting a previously flared shield conductor of a shielded electrical cable includes a two-piece clamping die having an aperture in which the shielded electrical cable is secured and a cutting surface. The clamping die is opened and closed around the shielded electrical cable. The apparatus further includes a cutting tube configured to be pressed against the cutting surface while the flared shield conductor is between the cutting tube and the cutting surface, thereby cutting a portion of a free end of the flared shield conductor. Alternatively, the apparatus may include a die comprising a cutting surface and an aperture in which the end of the shielded electrical cable is received. The cutting tube has two parts that are closed about the shielded electrical cable and pressed against the cutting surface while the flared shield conductor is disposed between the cutting tube and the cutting surface.

The invention discloses a composite conductive filler, a shielding material and a cable, the composite conductive filler comprises the following raw materials: conductive carbon black, carbon nanotubes and liquid metal, and the mass ratio of the conductive carbon black to the carbon nanotubes to the liquid metal is (80-90): (1-15): (1-12). The composite conductive filler provided by the invention has a ternary synergistic efficient conductive network structure, the contact resistance between the conductive fillers is remarkably reduced, the melt index of the composite conductive filler is greatly improved, meanwhile, micropores of the material can be filled at high temperature, the thermal cycle aging property of the material is remarkably reduced, and the service life of the material is prolonged. The integration of a high-stability conductive network, good processing fluidity and excellent interface thermal mechanical performance is realized. The key technical problem that conductivity, processability and long-term stability of a high-voltage cable semi-conductive shielding material are difficult to consider at the same time is solved, and particularly, the high-voltage cable semi-conductive shielding material can be applied to ultra-high voltage scenes of 110 kV and above.

The application provides a high-voltage cable preparation method and a high-voltage cable. The preparation method comprises the following steps: preparing modified polyvinyl chloride, wherein the modified polyvinyl chloride comprises polyvinyl chloride and a filler added into the polyvinyl chloride; taking 100 parts by weight of the polyvinyl chloride as a base material, and the filler comprises the following components in parts by weight: 1-2 parts of polyethylene, 2-3 parts of a filler, 2-3 parts of a lubricant and 2-5 parts of a toughening agent; extruding the modified polyvinyl chloride on the outer surface of a smooth metal sheath layer to form a modified polyvinyl chloride sheath, and the modified polyvinyl chloride sheath is bonded to the smooth metal sheath layer; and the smooth metal sheath layer is wrapped on the outer surface of a cable core. The high-voltage cable preparation method can greatly improve the flame-retardant performance of the high-voltage cable.

The invention provides an intelligent monitoring method for a high-voltage cable grounding box, and the method comprises the following steps: collecting the current data and voltage data of a protector grounding box, calculating the resistive current value of the protector grounding box, comparing the resistive current value of the protector grounding box with a set threshold value, and determining the current value of the protector grounding box. And fault information of the protector grounding box is accurately determined according to a comparison result. The resistive current component of the protector is calculated in real time by acquiring the induced voltage and current signals of the metal sheath and the armor layer of the high-voltage cable, so that the running state of the protector is accurately researched and judged, the breakdown frequency of the protector is counted, and when a corresponding alarm threshold value is reached, corresponding alarm information and processing measures are given, so that the safety of the protector is ensured. Real-time monitoring and comprehensive evaluation of the operation states of the high-voltage cable and the grounding box thereof are realized, and the safety and reliability of cable operation are improved.

The invention discloses a melt blending preparation process of a semiconductive shielding material for an ultrahigh-pressure crosslinked polyethylene cable, which comprises the following steps: S1, premixing low-density polyethylene and an ethylene-vinyl alcohol copolymer in proportion, the vinyl alcohol chain segment content of the ethylene-vinyl alcohol copolymer being 25%-45%; s2, performing plasma surface treatment on carbon black, and compounding the carbon black with carbon nanotubes to form a conductive filler system; s3, under the protection of inert gas, adding the matrix resin in the step S1 and the conductive filler in the step S2 into a double-screw extruder in stages, and synchronously adding a hindered phenol and phosphite compound antioxidant; and S4, carrying out segmented mixing under the temperature gradient of 160-210 DEG C. Through synergistic compounding of the plasma surface modified carbon black and the carbon nanotubes and in combination with a staged feeding process, directional dispersion of the conductive filler is realized, a three-dimensional interpenetrating conductive network is formed, and the local electric field homogenization capability of the ultrahigh-voltage cable is remarkably improved.

The invention discloses a high-voltage cable grounding current abnormity monitoring system, which belongs to the technical field of electric power facilities and comprises an inspection acquisition module, an association analysis module, a collaborative reasoning module and a self-optimization module. The inspection acquisition module is used for synchronously acquiring multi-source monitoring parameters and acquiring position information so as to generate a grounding parameter matrix; the association analysis module is used for screening suspected defect types, dividing a local overheating area, performing overheating cause judgment, constructing a coupling association matrix of a multi-physical field, performing evolution stage judgment in combination with historical data, and generating a preliminary mechanism hypothesis in combination with credibility rating; the collaborative reasoning module is used for constructing a dynamic knowledge graph and a constraint prediction network, constructing a collaborative reasoning mechanism based on a two-way real-time interaction channel, performing preliminary reasoning, and dividing early warning levels in combination with comprehensive confidence so as to perform operation and maintenance feedback; and the self-optimization module is used for carrying out directional iteration on the double engines by utilizing manual feedback and carrying out cross-line migration optimization according to different lines.

The invention provides a modularized grounding box for centralized grounding of multiple paths of high-voltage cables, which comprises a box body, a plurality of independent compartments are arranged in the box body, and a protector grounding unit or a direct grounding unit is arranged in each compartment. Each protector grounding unit or direct grounding unit is connected with a copper shielding layer and a grounding wire of an armor layer of the corresponding high-voltage cable; a centralized grounding unit and a centralized monitoring unit are also arranged in the box body; the centralized grounding unit is used for grounding each protector grounding unit and each direct grounding unit; the centralized monitoring unit is used for analyzing the operation state of the high-voltage cable and equipment. According to the high-voltage cable grounding box, a plurality of independent compartments are designed in the box body, so that mutual crosstalk of signals among grounding units is avoided, the overhaul efficiency of the high-voltage cable grounding box is improved, centralized maintenance of the grounding box is facilitated, and the investment cost is reduced; and meanwhile, one-point grounding is uniformly concentrated in the grounding box, so that the problem of fault hidden dangers of a plurality of grounding points formed by in-situ multi-point distributed installation is solved.

The invention belongs to the field of high-voltage cables, particularly relates to self-propelled unfolding equipment for high-voltage cables, and aims to solve the problems that the use position of an existing cable reel is fixed, a fixed pay-off rack is adopted at present, and once the cable reel is erected, the position of the pay-off rack is fixed and cannot be adjusted in the later period. And no self-adaptive cable reel adjusting function exists. And automatic leveling is realized without a cable reel. In order to solve the problem that in the prior art, a cable reel brake function does not exist, according to the scheme, the crawler-type walking device comprises a crawler-type walking device body, an upper frame, a hoisting mechanism and a cable reel support, the crawler-type walking device body is horizontally arranged on the ground, and the upper frame is arranged on the crawler-type walking device body. The cable reel support achieves independent height and interval adjustment through a lifting mechanism (a lifting oil cylinder and an inner rod and outer barrel structure) and a contraction and expansion mechanism (a telescopic oil cylinder and a sliding block and sliding groove), can adapt to cable reels of different specifications, achieves automatic leveling through an electric control system, and avoids equipment damage or operation interruption caused by unbalance loading.

The invention relates to the technical field of power system intelligent monitoring, and discloses a construction method and system of a digital twinborn model of a cable tunnel, and the method comprises the steps: collecting the skin temperature data and physical geometric data of a high-voltage cable in the cable tunnel through a sensing layer, and constructing a physical geometric model of the cable tunnel; based on the physical geometric data and the temperature data, establishing a cable temperature field simulation model in a network layer, and generating cable temperature field distribution data through multi-physical field coupling simulation; temperature field distribution data and real-time monitoring data are integrated in an application layer, a visual temperature monitoring platform is constructed, and the temperature change trend of the cable is analyzed and predicted through time sequence data. According to the method, the operation state of cable equipment in a cable tunnel is simulated by using a digital twinning technology, and cable holographic temperature sensing is realized. By monitoring and analyzing the temperature of the cable in real time, the load can be reasonably adjusted, the overload and loss of the cable can be reduced, the energy efficiency of a power system can be improved, and the purposes of energy conservation and emission reduction can be achieved.

The utility model belongs to the technical field of line testing, particularly relates to a line fault testing device, and provides the following scheme aiming at the problem that the accuracy of fault positioning is influenced due to the fact that pulse signals are attenuated in the conduction process of a high-voltage cable during the existing line fault detection, the line fault testing device comprises a main panel, the device comprises a main panel, two rotating shafts are rotatably installed on the main panel, the outer sides of the rotating shafts are fixedly sleeved with driving wheels and belt wheels, the two belt wheels are provided with the same belt in a transmission mode, a motor is fixedly installed on the rear side of the main panel, and an output shaft of the motor is fixedly connected with the rotating shaft located on the left side. The outer side of the main panel is slidably sleeved with a lifting plate. The device is reasonable in structural design, the whole device can move along the high-voltage cable through cooperation of the driving wheel and the limiting wheel, a sensor can directly detect possible fault points conveniently, attenuation of pulse signals in cable conduction during long-distance testing is reduced, testing accuracy is improved, and reliability is high.

The invention discloses a fault threshold adaptive adjustment method and system for high-voltage cable fault monitoring, and relates to the technical field of cable fault monitoring, and the method comprises the steps: configuring an initial fault triggering threshold; based on the fault triggering threshold, monitoring the running current of the high-voltage cable put into operation in real time, and judging whether fault signal acquisition is triggered or not; acquiring current signals in a set time period before and after the triggering moment, and judging the type of the triggering acquisition signal; adaptively adjusting a fault trigger threshold according to the type of the trigger acquisition signal; wherein when the trigger acquisition signal is judged to be a defect signal, the fault trigger threshold value is reduced; when it is judged that the trigger acquisition signal is a normal signal, a fault trigger threshold value is up-regulated; and continuously monitoring the running current of the high-voltage cable according to the adjusted threshold value, and continuously adaptively adjusting the fault triggering threshold value. According to the invention, the dynamic adjustment of the high-voltage cable defect recording alarm threshold can be realized, the high-voltage cable defect signal can be accurately captured, and the stable operation of a power system can be ensured.

The present invention discloses a high-voltage cable grounding box, comprising a box body and a wiring assembly connected to a high-voltage cable, wherein the wiring assembly is arranged inside the box body; the wiring assembly comprises a busbar and a plurality of rectangular wiring heads, wherein the plurality of wiring heads are arranged transversely on the busbar; and further comprising a heat dissipation assembly, wherein the heat dissipation assembly comprises a heat dissipation assembly, a driver and a cold row, wherein the driver and the cold row are arranged outside the box body, the heat dissipation assembly is detachably mounted on the busbar, the heat dissipation assembly is provided with a plurality of matching grooves for matching with the wiring heads, a flow channel for coolant to flow through is provided in the heat dissipation assembly, and the heat dissipation assembly, the driver and the cold row are connected in an end-to-end loop in sequence. The present invention achieves the purpose of heat dissipation by arranging a heat dissipation assembly, wherein the heat dissipation assembly comprises a heat dissipation assembly, a driver and a cold row, and the driver drives the coolant of the heat dissipation assembly to circulate between the cold row, the driver and the heat dissipation assembly, while achieving good heat dissipation effect and not damaging the sealing structure of the box body.

The invention relates to the technical field of material detection, in particular to a cross-linked polyethylene insulation material impurity full-detection device and system for a high-voltage cable and application, the detection device carries out detection based on single-row continuous flowing insulation material particles, and the detection device comprises a near infrared spectrum imaging unit, a visible light imaging unit and an image processor, and identifying black spot impurities and heterochromatic particles. The full-detection system provides a detection channel for installing full-detection equipment and comprises a current limiting pipe body and a camera obscura structure, and reflection spectrum and surface color information are collected in the camera obscura structure; the full-inspection system further comprises a buffer stock bin, a finished product stock bin, a pneumatic sorting module, a cyclone separator, a cooling fluidized bed and a metal separator. Impurity identification reliability is guaranteed through double optical detection, full-process online detection of insulation material impurities can be achieved, limitation of traditional sampling detection is broken through, full-detection coverage of insulation material particles is achieved, the impurity missing detection risk is eliminated, and the strict requirement of an ultrahigh-voltage cable for insulation material cleanliness is fundamentally met.

The utility model relates to a high-voltage cable buffer layer ablation characteristic gas detection device which comprises a gas acquisition unit, a gas detection unit, a data processing unit and an alarm unit, the gas collection unit comprises a circulating pump, a vacuum pump, a sampling gas cylinder, a pressure sensor and a plurality of valves, the gas detection unit comprises two detection modules, the gas inlet pipe is connected with a first electromagnetic valve, then is connected with the sampling gas cylinder and is connected with the circulating pump through a second electromagnetic valve, and the circulating pump is connected with the two detection modules through an electromagnetic three-way switching valve. An outlet of the sampling gas cylinder is connected with a third electromagnetic valve, then connected with an inlet of a vacuum pump, connected with a fourth electromagnetic valve and then connected with two detection modules at the same time; the first detection module is composed of a gas concentration sensor, a temperature sensor and a humidity sensor, and the second detection module is a gas sensor array. The device can perform field detection on gas generated in the ablation process of the buffer layer of the high-voltage cable, so that potential faults of the cable can be found and early warned in time.

The invention relates to the technical field of high polymer materials, and discloses a conductive shielding material for a high-voltage cable. Comprising the following components in parts by weight: 40 to 70 parts of main body polyolefin resin, 10 to 30 parts of ethylene-vinyl acetate copolymer, 5 to 15 parts of maleic anhydride grafted polyolefin, 20 to 40 parts of surface modified conductive carbon black, 0.5 to 2 parts of peroxide cross-linking agent, 0.5 to 3 parts of functionalized silane coupling agent, 0.1 to 1 part of processing aid and 0.1 to 1 part of antioxidant, the surface modified conductive carbon black is high-structure conductive carbon black which is subjected to plasma oxidation treatment, solution graft polymerization and surface coupling agent pretreatment. The conductive carbon black is subjected to multi-step surface modification including plasma oxidation, solution graft polymerization and surface coupling agent pretreatment, and the in-situ chemical bonding effect of maleic anhydride grafted polyolefin is matched, so that the agglomeration problem of the conductive carbon black caused by high surface energy is effectively solved.

The invention relates to the technical field of wires and cables, and discloses a high-voltage cable with a high pressure resistance function, which comprises an outer sheath, a pressure dispersion layer is arranged on the inner side of the outer sheath, soil settlement pressure is initially resisted by the elastic deformation of the outer sheath, and after the pressure is conducted to a buffer sheet on the outer side of an elastic buffer shell, the pressure is dispersed into the buffer sheet. The closed flow channel is driven to extrude the high-elasticity gel in the through square groove, the gel uniformly flows in the circumferential direction of the closed flow channel to convert local concentrated pressure into surface pressure, and uniform expansion of a nitrile rubber extrusion film is matched, so that primary efficient dispersion of the pressure is realized; the omega-shaped supporting frames and the inverted-Y-shaped supports form an elastic supporting system, the inverted-Y-shaped supports provide reverse supporting force by means of triangular stability to slow down expansion of the supporting frames, meanwhile, the adjacent supporting frames absorb bending stress through the elastic metal corrugated plates, the high-strength insulation connecting rods transmit the stress to the global closed frame, and global sharing of single-point stress is achieved.

The invention relates to a high-voltage cable surface defect detection method and system based on a self-adaptive rolling ball method. The method comprises the following steps: acquiring point cloud data of the surface of a to-be-detected high-voltage cable; the point cloud data is processed by adopting a rolling ball method, and in the process of processing each three-dimensional point cloud area by adopting the rolling ball method, the dynamic rolling ball radius is determined by calculating the local point density and the vertex average curvature of the current three-dimensional point cloud area so as to perform point cloud reconstruction; and for the three-dimensional grid model obtained by point cloud reconstruction, extracting a circumferential curvature sequence along the axial direction of the cable, predicting a gap position by means of a pre-trained gap prediction model, and complementing the predicted gap position so as to improve the form reduction precision of the gap position and obtain a final high-voltage cable surface defect detection result. Compared with the prior art, the defect detection sensitivity is improved, and the defect detection error is reduced.

The invention relates to the technical field of cable materials, and particularly discloses a flame-retardant polyethylene sheath material for an ultrahigh-voltage cable and a preparation method thereof.The flame-retardant polyethylene sheath material for the ultrahigh-voltage cable provided by the invention takes low-density polyethylene as a main base material, and the molecular structure of the low-density polyethylene has more long-chain branches; and meanwhile, by adding the composite filler and the auxiliary agent, the prepared polyethylene sheath material has excellent mechanical properties, high and low temperature resistance and flame retardance.

The invention relates to the technical field of power systems, and discloses a tunnel high-voltage cable temperature monitoring method, system, device, medium and product, and the method comprises the steps: collecting the multi-dimensional parameters of a target cable, simulating the temperature distribution of the target cable through constructing a multi-physics coupling finite element model, carrying out the dichotomy of a plurality of temperature data points, and carrying out the dichotomy of the temperature data points; and obtaining abnormal temperature data points and normal temperature data points, training a classifier according to the plurality of temperature data points and the category labels corresponding to the plurality of temperature data points to obtain a cable temperature anomaly monitoring model, thereby obtaining a cable temperature anomaly monitoring model after inputting a cable temperature prediction value of the target cable at the current prediction moment. And the category label of the target cable at the current prediction moment is output, so that the abnormal condition of the cable temperature is effectively identified, the cable temperature monitoring precision is improved, and the cable temperature field simulation precision and the real-time early warning capability under the complex working condition are remarkably improved.