1634 results about "High-voltage cable" patented technology

An apparatus for facilitating the landing and takeoff of electric vertical takeoff and landing aircraft (EVTOL) can comprise a moveable landing platform, a moveable charging assembly comprising a high voltage cable adapted for electrical, magnetic induction positioned within a vertically moveable column having a magnetic plate and multiple access connections, and weight sensors positioned on the landing platform. The weight sensors are operatively connected to the charging assembly such that when the sensors detect the landing of an EVTOL on the platform, the sensors trigger the charging assembly to rise up to contact the EVTOL and begin charging the EVTOL.

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.

The invention relates to the field of cable fault identification, in particular to a high-voltage cable fault identification method for on-line monitoring of sheath current, which comprises the following steps of: firstly, monitoring in real time through a sheath current sensor, a fault traveling wave collector and a cable temperature sensor at key positions along a line, collecting cable line parameters, analyzing normal operation data, and determining the fault of a high-voltage cable according to the normal operation data; establishing a sheath current and temperature characteristic model, calculating the sheath current in real time and comparing the model, if the sheath current exceeds a threshold value, preliminarily judging a fault, and then calculating a fault area through traveling waves; temperature change data are obtained in a fault area, and an average temperature highest point area is found through calculation to accurately calibrate a fault position. According to the method, cable operation conditions are comprehensively mastered by multiple means, faults can be found in time, fault areas and positions can be accurately determined, fault types can be accurately judged according to multi-aspect information, the accuracy and timeliness of high-voltage cable fault recognition are effectively improved, safe and stable operation of a power system is powerfully guaranteed, and the working efficiency is improved. The operation and maintenance cost is reduced; and the cable management level 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 high-voltage cable test detection device, and belongs to the technical field of cable detection, the high-voltage cable test detection device comprises a test board, a clamping guide assembly is arranged in the center of the top of the test board, fixing rings capable of freely moving are arranged on the two sides of the clamping guide assembly, and a feed assembly is arranged on one side of each fixing ring. According to the device, by arranging a conversion cutter collecting assembly, a trigger ball can move under the pressure of an insulating layer, the trigger ball drives a clamping groove to move through a moving rod, a laminating wheel and a sliding block, so that the clamping groove is separated from a sliding disc, then the sliding disc is driven by a third spring to move upwards, and the sliding disc drives a mounting frame to move; the mounting frame drives the connecting rod to move, the connecting rod drives the cutter to retract, and the cutter is prevented from cutting an internal metal piece, so that the safety and accuracy of insulating layer stripping are improved, damage to a high-voltage cable is avoided, and the accuracy of a test result is improved.

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 relates to the field of cable monitoring, in particular to a high-voltage cable running state comprehensive monitoring method based on a TMR magnetic sensor. According to the method, firstly, a TMR magnetic sensor is adopted to collect sheath current and partial discharge pulse signals of a cable joint grounding wire, then amplification, filtering and AD change are carried out, Fourier transform is carried out, and low-frequency signals and high-frequency signals are separated out; carrying out frequency spectrum analysis on the high-frequency signal, preliminarily judging whether a discharge defect exists or not, carrying out Fourier inversion on the low-frequency signal, evaluating a grounding state and an insulation health state of a cable sheath, carrying out Fourier inversion on the high-frequency signal, and carrying out partial discharge fault type analysis in combination with a time domain partial discharge pulse signal and a power frequency current phase; and finally, comprehensively evaluating the operation state of the high-voltage cable by analyzing the grounding current of the sheath and the related parameters of partial discharge. According to the invention, the hardware cost is reduced, the system design and installation complexity is simplified, and the accuracy of partial discharge fault type identification is improved.

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.

The electrified vehicle includes a vehicle body, a plurality of wheels configured to support the vehicle body, a power unit attached to the vehicle body and configured to drive at least one of the plurality of wheels, and a high-voltage cable arranged in a vertical direction behind the power unit. The vehicle body is configured to support a lower portion of the power unit, and the upper portion of the power unit is configured to be connected to or engaged with the vehicle body via a bracket at least in a vehicle front-rear direction.

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 long-distance subarea step-by-step fracturing coal seam permeability increasing method and system, and the method comprises the steps: dividing a target coal seam into different subareas, setting a plurality of perforation point locations according to fracturing requirements, and obtaining fracturing construction parameters of the subareas of the target coal seam; according to the fracturing construction parameters, directional perforation fracturing is conducted on the target coal seam through a kilometer directional drilling machine provided with a laser device; the deepest perforation of the target coal seam is sealed through a hole packer, a conductive ion solution is injected into the hole, and secondary single-hole local fracturing is conducted through the liquid-electric effect; and respectively connecting the positive electrode and the negative electrode to the walls of two adjacent perforation holes, and performing three-stage two-hole block fracturing by utilizing an electric crushing effect until the coal seam in the partition is completely fractured. According to the method, three-stage step-by-step fracturing permeability increasing of the target coal seam can be achieved, consumption of water resources and energy loss of high-voltage cables are reduced to a great extent, and the energy utilization rate is increased.

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 discloses a high-voltage cable laying construction process intelligent control method and device and a storage medium, and the method comprises the steps: arranging a tension sensor according to a node construction site environment and a construction plan; acquiring traction data at different positions of the cable to control the power output of the tractor; lateral pressure data of the cable is monitored in real time, power output of the traction machine is adjusted, and high-voltage cable laying construction of the node is achieved; visually and dynamically simulating a high-voltage cable laying construction process and recording a construction site environment, a planned traction force and side pressure data, wherein the high-voltage cable laying construction process comprises a plurality of construction nodes; and carrying out construction plan adjustment and resource configuration optimization in the current high-voltage cable laying construction node in combination with the current construction site environment and the construction plan. According to the method, the construction efficiency, the safety, the resource utilization rate and the management efficiency are improved, the construction risk is reduced, the service life of the cable is prolonged, and remarkable economic benefits and social benefits are achieved.

The invention discloses a high-voltage cable outer metal sheath grounding defect on-line monitoring method and monitoring system, which can work under the condition that a cable is not powered off, realizes on-line monitoring, and realizes on-line monitoring through the cooperation of a current sensor, a voltage sensor, a single-chip microcomputer and an upper computer. And the equipment can quickly detect when a fault occurs and is convenient for maintenance workers to timely eliminate obstacles, so that the risk of major electric power accidents is reduced. The algorithm is similar to an improved neural network algorithm and is used for diagnosing the defects of the outer metal sheath of the cable, the weight is obtained through training learning, and finally the defects of the outer metal sheath of the high-voltage cable are determined. The protection content covers each component of the technical scheme, and comprises a monitoring method, a device structure, a sensor technology, a data processing algorithm, a neural network learning algorithm and the like.

The invention relates to the technical field of charging piles, and discloses a matrix split type direct current charging pile and a power distribution method thereof, and the charging pile comprises a power control unit which is configured to control the power output of the charging pile according to the connection information of a charging gun; the charging module unit is connected with the power control unit, the matrix power distribution unit is connected with the charging module unit, the matrix power distribution unit is controlled by a power distribution mainboard, direct-current electric energy output by the charging module unit is switched to a required direct-current bus, and the direct-current electric energy is conducted to a charging gun of a terminal cabinet through a high-voltage cable to charge a vehicle end; the terminal control unit is connected with the matrix power distribution unit; and the man-machine interaction unit is connected with the power control unit. According to the invention, the output of the power of the charging pile can be accurately controlled according to the connection information of the charging gun, efficient distribution of electric energy is realized, the charging process is optimized, the phenomenon of unbalanced power output in a traditional charging pile is avoided, and the charging efficiency is 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.

The invention discloses a high-voltage cable line operation state inversion method and system, and relates to the technical field of high-voltage cable line supervision, and the method comprises the steps: collecting the structure, size and material parameters of a cable accessory, and building an electromagnetic thermal multi-physical field simulation model of the cable accessory and the defect of the cable accessory; establishing a multi-physical field simulation model of the cable buffer layer and the defects thereof; establishing a multi-physical field simulation model and a field-circuit coupling model of an electromagnetic field, a temperature field and a flow field of the cable tunnel; obtaining an actual measurement value of a cable line state parameter, comparing the actual measurement value with a simulation result of large-scale and local defects of a cable tunnel space, and correcting the model according to a comparison result; and inversion of tunnel cables and typical defect faults of the cables under different working conditions is realized. According to the method, cable overall operation state simulation and typical defect simulation are integrated to realize simulation reproduction and defect inversion of a cable line state.

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 a high-voltage cable buffer layer temperature early warning and discharge ablation defect evaluation system and method, and the system comprises a high-voltage cable temperature online monitoring and early warning subsystem which is used for setting a high-voltage cable buffer layer dynamic temperature alarm threshold value and carrying out the online monitoring of the real-time temperature data of a high-voltage cable, judging whether the real-time temperature data exceeds a dynamic temperature alarm threshold value or not, if yes, triggering an alarm, outputting an alarm signal and continuing to carry out monitoring and judging operation, and if not, continuing to carry out monitoring and judging operation; the high-voltage cable buffer layer gas infrared spectroscopic analysis subsystem is used for collecting characteristic gas in the high-voltage cable buffer layer based on the alarm signal, carrying out infrared spectroscopic analysis, comparing infrared spectroscopic analysis results according to a set high-voltage cable buffer layer ablation degree judgment standard, and sending the comparison result to the high-voltage cable buffer layer gas infrared spectroscopic analysis subsystem; and determining the discharge ablation degree of the high-voltage cable buffer layer. Compared with the prior art, the method has the advantages of accurately judging the ablation degree of the cable buffer layer and the like.