213 results about "Insulator strings" patented technology

The invention discloses a multi-modal data fusion-based DC insulator degradation diagnosis method and system. The method comprises the following steps of obtaining infrared image data and current data of a to-be-detected insulator string; constructing an insulator chain model according to the infrared image data, and obtaining the temperature of each insulator according to the insulator chain model and the infrared image data; obtaining the theoretical temperature of each insulator according to the current data; and according to the theoretical temperature of the insulator and the temperature of the insulator, degradation identification of the insulator is realized. Obtaining historical maintenance data of the insulator, constructing a self-adaptive threshold according to the historical maintenance data of the insulator, and performing secondary judgment on a degradation identification result through the self-adaptive threshold; according to the method, the problems of diagnosis one-sidedness, poor environmental adaptability, low degradation positioning precision and the like caused by dependence on a single data source in a traditional method are effectively solved, and the accuracy, robustness and engineering practicability of direct current insulator degradation diagnosis are remarkably improved.

The invention discloses a multi-union strain insulator detection device based on unmanned aerial vehicle mounting, which comprises a walking mechanism and a remote controller, the outer wall of the top of the walking mechanism is fixedly connected with a hanging ring, the outer wall of the walking mechanism is fixedly connected with a frame, the outer wall of the frame is fixedly connected with two length-adjustable guide mechanisms, and the length-adjustable guide mechanisms are fixedly connected with the remote controller. The guide mechanism is arranged on the frame and is symmetrical about the frame, the outer wall of the frame is fixedly connected with a mounting support, and the mounting support is located at the bottom of the guide mechanism and is symmetrical about the frame. During use, the unmanned aerial vehicle and the hanging ring are connected through the multiple sections of connecting rods, then the unmanned aerial vehicle is transported to an insulator of a power transmission line in an air mode, the unmanned aerial vehicle can move on the insulator through the walking mechanism, the two layers of detection mechanisms are arranged on the frame, and therefore an upper insulator chain and a lower insulator chain can be detected; in this way, the device can adapt to insulator strings with different diameters, and the device can be more stable during walking through the guide mechanism.

The invention discloses an unmanned aerial vehicle mounted insulator detection device and a use method thereof. The unmanned aerial vehicle mounted insulator detection device comprises a hanging frame, a driving unit, a detection unit, a stabilizing unit and an auxiliary unit, the hanging frame comprises two center plates and two triple blocks connected with the two center plates, the opposite sides of the two center plates are fixedly connected with extension frames, and the extension frames and the center plates jointly form an inverted-U-shaped structure capable of bestriding an insulator chain; the driving unit is of a flexible belt transmission structure; the detection unit comprises a zero-value detector arranged on the extension frame, and the signal input end of the zero-value detector is electrically connected with a detection needle; the auxiliary unit comprises V-shaped sliding rails arranged at the two ends of the center plate, guide blocks connected to the two slopes of the V-shaped sliding rails in a sliding mode, a supporting shaft fixed to the guide blocks and a friction sleeve rotationally connected to the supporting shaft through a rotating sleeve. The problem that in the prior art, an insulator zero value detection device is large in displacement shaking amount on an insulator chain is solved.

The invention discloses a method and a combination tool for live-line installation or replacement of a windage yaw prevention insulator, and relates to the technical field of electric power auxiliary equipment, the installation method comprises the following steps: opening an upper-layer live-line lead, putting down an insulating lifting rope through an insulating fork-shaped pulley rod on a working layer, connecting the insulating lifting rope with an insulating lock rod, and installing a windage yaw prevention insulator on the upper-layer live-line lead. The method comprises the following steps: connecting an insulating lock head rod with an electrified lead of a working layer, tightening an insulating lifting rope, carrying out positioning control on the electrified lead, dismounting and mounting the windage yaw prevention insulator string, and finally repeating the steps to complete replacement of the windage yaw prevention insulator string of the next layer. The windage yaw prevention insulator string can be safely and efficiently installed or replaced, and the working space and the power supply reliability of operators are improved; the safe distance of the live lead can be adjusted, and a safe operation space is provided for operators.

The utility model discloses a ten-bundle conductor tension string suitable for ultrahigh altitude, which belongs to the technical field of tension strings and comprises two groups of tension string units. The tension string unit comprises two insulator strings which are arranged in parallel at an interval; one end of the insulator string is connected with an iron tower cross arm through the hanging point side fitting, and the other end of the insulator string is connected with a lead through the lead side fitting; the wire side fitting is provided with a shielding ring assembly. The wire side fitting is also provided with a grading ring which is wound on the tension string unit. According to the ten-bundle conductor strain insulator string suitable for the ultrahigh altitude, the structure can ensure that the electromagnetic environment and the air gap of a power transmission line do not exceed the limit under the condition of the ultrahigh altitude, the ecological environment protection requirement is met, and the engineering construction, the economic development and the ecological environment protection are organically combined.

The invention relates to the technical field of power grid data processing, in particular to a power grid digital twinning technology analysis method and system based on AI image recognition, and the method comprises the following steps: collecting a visible light image and an ultraviolet image of an insulator string through a multi-spectral camera carried by an unmanned aerial vehicle, and obtaining line leakage current waveform data at the same time; generating a multi-scale pollution feature matrix; calculating the equivalent resistivity of the polluted conductive path; reconstructing surface electric field distribution of the digital twin based on the equivalent resistivity, and simulating field intensity distortion gradients under different humidity conditions; when the field intensity distortion gradient reaches a preset percentage of the air breakdown field intensity, a graded early warning signal is generated; according to the invention, the electric field distortion of the dirty layer under different humidity conditions is simulated to generate the humidity-field intensity mapping relation, so that whether the insulation performance of the electrical equipment is affected or not can be judged.

The invention discloses a power transmission equipment insulator defect identification method and device, equipment and a medium, and belongs to the field of power equipment defect identification, and the method comprises the steps: respectively extracting corresponding feature data from electric signal monitoring data, infrared data and image data of an insulator string; fusing the characteristic data corresponding to the electric signal monitoring data and the infrared data through a cross-modal attention mechanism, and positioning an abnormal region; determining a defect physical region image of the insulator string according to the abnormal region and feature data corresponding to the image data; performing secondary verification on the defect physical region image according to the environmental parameter data of the space where the insulator string is located; and when the secondary verification is passed, respectively calculating a plurality of defect judgment indexes of the insulator chain according to the defect physical region image, and determining that the insulator chain has defects when any defect judgment index meets a preset condition. According to the invention, the problem of low insulator defect identification accuracy in a complex environment can be solved.

The invention belongs to the technical field of power robots. According to the suspension insulator layered progressive intelligent deicing method, robot and system, in the insulator multi-dimensional sensing intelligent recognition step, after the deicing robot is hung to a tower where an insulator string is located, an insulator multi-dimensional sensing recognition agent is called to recognize an insulator string image in an icing state, and the insulator string image is subjected to image recognition; obtaining a position identification result and an icing thickness of the insulator string; in the layered progressive adaptive decision-making step, an autonomous decision-making agent is called to adaptively select a deicing strategy according to the icing thickness, and a deicing clamping jaw is controlled to deice the insulator chain layer by layer according to the selected deicing strategy and the position identification result of the insulator chain; in the effect evaluation closed-loop strategy adjustment step, the ice detection agent is autonomously called in the deicing process to evaluate the deicing effect, and the deicing strategy is dynamically adjusted in a closed-loop mode according to the deicing effect evaluation result. According to the invention, the accuracy, efficiency and safety of deicing operation are greatly improved.

The invention discloses a voltage balance control method for a disc-shaped suspension insulator, and particularly relates to the field of power systems, and the method comprises the steps: carrying out the simulation calculation of the electric field distribution of an insulator string through finite element simulation software, and obtaining the voltage and electric field distribution conditions of the insulator string when a classification ring is not installed; electric field simulation analysis is carried out by establishing a simulation model of the insulator string and the grading rings, and the diameter, height and relative position of each grading ring are iteratively adjusted; the grading ring is fixed at the axial position of the insulator string; and nano-scale particles are added into the insulating material matrix. The insulation reliability of the insulator is improved, the service life of the insulator is prolonged, and meanwhile the voltage distribution coefficient of each insulator unit tends to be balanced.

The invention discloses an ultra / extra-high voltage alternating current line degraded insulator live detection and intelligent evaluation system, which comprises a data acquisition module, which adopts a high-precision electric field sensor array with electromagnetic protection to carry out multi-angle electric field live scanning, sampling and detection on different types of insulator strings; the feature extraction module is used for establishing an electric field distribution multi-dimensional feature library including an electric field gradient matrix, an electric field entropy value, electric field spectral density and electric field polarization features according to the collected data features, and extracting abnormal features through wavelet transform and an outlier detection algorithm; and the intelligent evaluation module is used for constructing an insulator multi-physics field coupling model, establishing a mapping relation between electric field characteristics and degradation types, positions and degrees through bidirectional calibration of measured data and model prediction data, and outputting an evaluation result. The intelligent evaluation system can efficiently and accurately identify the degradation state of the insulator, reduces the operation and maintenance cost of a power grid, and guarantees the safe and stable operation of a power system.

This application provides a method and system for monitoring and alarming the tilt of overhead ground wire suspension insulator strings. The method includes: synchronously acquiring insulator string operating status and environmental data through a multi-sensor acquisition module, including micro-meteorological, tilt angle, infrared image sensors, and a right-angle gate module; performing Kalman filtering, noise reduction, normalization, and LZ77 compression on the data to form a unified feature dataset; real-time anomaly detection and data upload at the edge using a lightweight CNN-LSTM fusion model; and fault type identification and severity assessment via ResNet in the cloud, including accurate displacement calculation; generating early warning information and maintenance suggestions by combining historical data and maintenance strategies, and pushing them through a multi-channel method including tower-side audible and visual alarms and mobile terminal push notifications. This application achieves all-weather, high-precision monitoring, improves the accuracy of anomaly identification and alarm timeliness, ensures the safe operation of transmission lines, and reduces power outage losses.

The present application provides a kind of transmission conductor negative stiffness damper, provides damping by another connection damper, negative stiffness device increases damping ratio, realizes conductor model damping effect;Main components are arranged side by side by fixed magnet and movable magnet, the interaction force between its magnets is basically linear increase, that is, it can guarantee constant negative stiffness value, damping effect is obvious and model loss is small, and durability is strong;Light weight, convenient transportation, easy to install and maintain;Transmission conductor negative stiffness damper is rigidly connected with insulator string as a whole, and can effectively transmit the vibration of conductor galloping;The present application is novel and unique in design, has wide range of application, and has good popularization and application value and economic benefits.

The invention provides a differential pressure detection device and a method for determining the degradation condition of an insulator string. The device comprises a detection circuit and a first resistor, and the voltage difference detection device is used for detecting the voltage difference between the input end and the output end of a corresponding insulator. The detection circuit is connected with the first resistor in series, the detection circuit comprises a first breakdown unit, a second breakdown unit, a second resistor and a current detection unit, and the resistance value of the second resistor is smaller than that of the first resistor; the first voltage stabilizing unit, the second voltage stabilizing unit and the second resistor are connected in parallel; the current detection unit is used for detecting current flowing through the second resistor. Through the voltage difference detection device, the voltage difference condition of the insulator string can be determined, the degradation condition of the insulator string is evaluated according to the voltage difference condition, and the processing efficiency is improved.

The invention discloses a method and a system for predicting discharge voltage of an insulator string at an extreme temperature, and belongs to the technical field of high voltage and insulation. The method comprises the following steps: acquiring test data of an insulator string discharge voltage test, preprocessing the test data, and dividing the preprocessed test data into a training set and a test set according to a preset proportion; obtaining an optimal key hyper-parameter, establishing an XGBoost model through the optimal key hyper-parameter, and training the XGBoost model by using the training set to obtain an XGBoost discharge voltage prediction model; and inputting a new data set to be predicted into the model, and predicting the discharge voltage of the insulator string at the extreme temperature to obtain a predicted value of the discharge voltage of the insulator string at the extreme temperature. Compared with a traditional discharge voltage calculation method, the method can predict the discharge voltage of insulators with different string numbers and under different meteorological conditions, is higher in accuracy, does not need a tedious calculation program, and is high in prediction efficiency.

The invention discloses a composite porcelain insulator string, and belongs to the technical field of power equipment. The insulator string is mainly formed by compounding an end hardware fitting, a core rod and a porcelain piece sleeved on the core rod. The core is that the fittings are crimped at two ends of the core rod for connection; the core rod is used as a bearing and internal insulation main body; the porcelain piece is provided with the hollow pipe and the umbrella skirts, and the porcelain piece and the core rod are glued into a whole through the insulation paste, so that the creepage distance is effectively increased, the core rod is protected from environmental erosion, and aging and brittle failure of the core rod are prevented. The composite insulator combines the advantages of good mechanical stability of a porcelain insulator and strong bearing capacity of a composite insulator, has excellent electromechanical performance and long-term operation reliability, and is particularly suitable for an ultra-high voltage transmission line.

The invention relates to the technical field of electric leakage measurement, and discloses an on-line monitoring method and system for an interface leakage current of an insulation crossing frame, and the method comprises the steps: extracting a time domain waveform of a leakage current signal in an insulator string as original leakage current data; according to the geometric topological parameters of the insulator string, constructing a surface electric field distribution gradient of the insulator string, and extracting an electric field feature vector of the surface electric field distribution gradient; separating an interface leakage current component in the electric field feature vector; the method comprises the following steps: acquiring an environmental noise sample in a state that an insulator string has no working voltage, and constructing a noise reference set of the insulator string; performing coherent filtering on the interface leakage current component according to the noise reference set to generate a purified leakage current signal; generating an interface leakage current effective value of the insulation crossing frame according to the root-mean-square value of the purified leakage current signal; according to the invention, the accuracy of online monitoring of the interface leakage current of the insulation crossing frame can be improved.

The application discloses a kind of insulator hanging direction judgment method and system in strain insulator string, equipment, it is related to power transmission engineering technical field, it includes according to line parameter data to judge the control operating condition of overhead line;Calculate the hanging point tension of considering string weight under corresponding control operating condition;The hanging point tension of considering string weight is judged, if hanging point tension does not comply with preset requirement, then relax the safety factor of overhead line, until hanging point tension complies with preset requirement, then calculate the inclination angle of midpoint of strain insulator string considering string weight under average temperature operating condition;The hanging direction of insulator is judged according to the inclination angle of midpoint of strain insulator string considering string weight under average temperature operating condition.The application can consider the influence of strain string unit load on sag and tension, calculate the tension of overhead line under non-uniform load, and judge the hanging direction of insulator in strain insulator string, to achieve more accurate calculation, ensure the accuracy and safety of design.

The utility model discloses a disc-shaped suspension insulator duplex single-hanging-point V-shaped suspension string which comprises a spacing frame, the spacing frame is provided with a fast-assembly mechanism, the top of the spacing frame is provided with two V-shaped disc-shaped insulator strings, the outer sides of the two disc-shaped insulator strings are provided with a voltage-sharing mechanism, the fast-assembly mechanism comprises a support frame, and the support frame is provided with a fixed support. A plurality of wire seats are arranged on the outer side of the supporting frame, a connecting seat is fixedly connected to one end of each wire seat, a movable cover is rotationally connected to each connecting seat, and an embedded clamping block is fixedly connected to the end of each movable cover. According to the disc-shaped suspension insulator duplex single-hanging-point V-shaped suspension string, wires are placed on the wire base, the movable cover is rotated, so that the magnetic embedded clamping block at the end of the movable cover is inserted into the wire base, then the rotating head is rotated to press the embedded clamping block, and then the rotating head is pressed inwards for locking, so that the multiple wires are rapidly installed at the same time, and the installation efficiency is improved. And the installation efficiency and convenience are effectively improved.

The invention belongs to the technical field of power transmission line inspection, and provides an intelligent identification and automatic detection method and system for the front end of a power transmission line insulator, and the method comprises the steps: analyzing a preset route in response to an inspection task, and flying to a target waypoint according to waypoint information in the preset route; a video stream of a target waypoint is obtained, image frames in the video stream are identified by using a pre-trained insulator string identification model, and an insulator string is detected; adjusting the posture to enable the target insulator string to be centered in front of the target insulator string; distance information of a front detected insulator steel cap is obtained, the three-dimensional coordinate position of a center point is calculated in combination with fuselage parameters and external parameter calibration data, and based on the three-dimensional coordinate position of the center point, the pixel-level offset of the center point from the center position of a video frame is calculated; and according to the relationship among the image coordinate system, the camera coordinate system and the world coordinate system, carrying out fine adjustment on the position of the machine body so as to carry out piece-by-piece contact type detection. According to the invention, the safety, precision and efficiency of power transmission equipment detection are significantly improved.

This invention discloses a testing device for tension insulator strings in high-voltage transmission lines, belonging to the field of power line inspection technology. The device includes a C-shaped semi-enclosed support mechanism, a walking drive mechanism, a defect detection mechanism, and a radial adaptive locking adjustment mechanism. The C-shaped semi-enclosed support mechanism adopts an open frame that can be wrapped around the outside of the insulator string. A radial adaptive locking adjustment mechanism is installed at the opening, and an adaptive flexible fitting component is configured on the inner side to achieve assembly gap compensation and stable fitting. The walking drive mechanism adopts a tracked structure adapted to the insulator contour and is combined with a skirt limiting structure to achieve anti-slip and anti-detachment. The defect detection mechanism integrates visual inspection and electrical parameter detection components, enabling online identification of icing, surface damage, and zero / low-value insulation defects. This invention is easy to assemble, highly adaptable, and provides accurate detection, significantly improving inspection safety and automation levels. It is suitable for online automated inspection of tension insulator strings in high-voltage transmission lines.

The invention discloses a power transmission line drilling tower and a power transmission line tower system, and relates to the technical field of power towers, the power transmission line drilling tower comprises a tower body, the top of the tower body is provided with a cross arm, the two sides of the top of the cross arm are provided with grounding frames, the middle part and the end part of the cross arm are hung with insulator strings through hanging pieces, and the end part of each insulator string is provided with a ball joint assembly; a buffering assembly is arranged at the end of the ball joint assembly, a fixing fitting is arranged at the end of the buffering assembly, the ball joint assembly comprises a spherical groove seat, a ball seat is arranged in the spherical groove seat in a rolling fit mode, a connecting rod is arranged on the side face of the ball seat, the buffering assembly comprises two fixing seats, and connecting rods are hinged to the two ends of each fixing seat. According to the invention, after the tension degree of the cable is increased to a certain degree, intervention can be carried out in time, the tension degree is prevented from being further increased to damage the tower body and the cable fixing structure, and the swinging of the cable is effectively inhibited.

The utility model relates to the technical field of high-voltage power transmission lines, in particular to a cable terminal leading-down structure based on reconstruction of a built overhead power transmission line, which comprises a built steel pipe pole main pole, a cable terminal equipment cross arm, a first cable clamp cross arm and a second cable clamp cross arm. A ground wire cross arm and a plurality of wire cross arms are arranged on the built steel pipe pole main pole; the wire cross arms comprise an upper wire cross arm, a middle wire cross arm and a lower wire cross arm; an upper wire leading-down cross arm is arranged at the end part of the upper wire cross arm, and a middle wire leading-down cross arm is arranged at the end part of the middle wire cross arm; the cable terminal device cross arm is provided with a cable terminal base, a lightning arrester base and an inversely-hung insulator string hanging plate. The cable terminal leading-down structure provided by the utility model is rebuilt based on the built overhead transmission line steel pipe pole, an old tower does not need to be dismantled, a new tower does not need to be newly built, the occupied area does not need to be increased, the construction cost is greatly reduced, and the problems that an urban corridor is narrow, underground pipelines are numerous, and the cable terminal tower is difficult to be newly built are solved.

The utility model relates to high -voltage electrical equipment insulator live working robot and working method relates to electrical equipment technical field for solving the problem of low efficiency of insulator string manual cleaning in prior art, including base, clamping component, lifting assembly and operation component, clamping component includes clamping rod, clamp and clamping drive mechanism, one end of clamping rod is rotatably connected with base, the other end of clamping rod is fixed with clamp, and clamping drive mechanism is located on base and drives the swing of clamping rod, operation component includes main guide rail, operation head, auxiliary guide rail and air pump, one auxiliary guide rail is slidably installed at both ends of main guide rail, operation head is slidably connected with support rail and the initial position of operation head is located in main guide rail, the circular arc inner wall of operation head has air hole and camera, air hole is connected with air pump on base through air pipe, and camera is used for shooting insulator string surface image, lifting assembly is located between main guide rail and base, the utility model can realize the automatic cleaning and detection of insulator string.

A power transmission line fault simulation and simulation test method and system, a transient simulation model of an actual power transmission line is established, and a wave speed is simulated and calculated; a simulation test is carried out on a test line, a fault source is output, a normal current at a power frequency is first output, a lightning impulse is injected at a peak of the normal current at the power frequency, and then a flashover discharge current of an insulator string is output, a duration of the flashover discharge current is calculated according to a lightning fault current set during simulation; if the test is normal, wave head times captured by two fault detection devices are obtained, corresponding two positioning errors are calculated in combination with the wave speed calculated by simulation, if the positioning errors exceed a set error threshold, it is indicated that the fault detection device is unqualified; otherwise, it is qualified, and a fault test is carried out by using the qualified fault detection device. The present application can efficiently carry out a detection test of a power transmission line fault positioning device.

This application provides a multi-view detection method and related equipment for the distribution and bridging degree of frost on suspension insulators, belonging to the field of intelligent monitoring technology for transmission lines. The method includes: extracting and registering the foreground of the insulator before and after icing from a group of images taken from multiple perspectives; locating the axial position range of each umbrella unit using the axial gradient distribution features of the ice-free reference image; extracting and quantifying the ice edge using the circumferential gradient saliency features of the iced image; defining and calculating multi-dimensional parameters such as the circumferential / axial distribution non-uniformity of the ice, the bridging degree of local umbrella units, and the overall bridging degree of the insulator string; and finally comprehensively evaluating the uniformity of the icing distribution and the bridging risk level, outputting a quantitative report and operation and maintenance decision recommendations. This application effectively overcomes the detection challenges of variable perspectives and complex lighting conditions in natural scenes through bidirectional gradient feature collaboration and multi-view adaptation mechanisms, providing accurate and reliable technical support for power grid icing prevention and disaster reduction.

The utility model discloses an insulator resistance value high-efficiency detection device, which belongs to the technical field of electrical variable measurement, and comprises an unmanned aerial vehicle main body, the bottom end of the unmanned aerial vehicle main body is fixedly provided with a mounting rack in a threaded manner, the bottom end of the mounting rack is fixedly provided with a detection assembly, and the detection assembly comprises a first insulating rod. The tail of one end of the first insulating rod is connected with an electric control box, and a second insulating rod is inserted into an inner hole of the other end of the first insulating rod. The probe bracket detection part in the detection device can rotate and adjust the probe bracket corresponding to the dial according to different mounting modes of insulator strings in detection so as to ensure that the probe is in close contact with steel caps at the two ends of the insulator, and in the detection process, when the probe is carelessly clamped on an insulator sheet, the probe bracket can be rotated to adjust the probe bracket. The unmanned aerial vehicle is increased in power and flies backwards, the probe can be pulled out, the air crash risk is reduced, meanwhile, connection is conducted in cooperation with a pipe hanging frame made of insulating materials, the safety of the detection process is further improved, and potential safety hazards such as breakdown are reduced.

The invention belongs to the technical field of insulator chain detection, and discloses an insulator chain detection method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the position information of a target insulator chain, and obtaining the position information of the target insulator chain according to the position information; controlling the visual detection flying robot carrying the detection instrument through the mechanical arm to fly to a hovering position above the target insulator string, identifying the axis of the target insulator string so as to control the visual detection flying robot to rotate, and enabling the flying plane of the visual detection flying robot to be parallel to the axis, controlling the visual detection flying robot to drive a mechanical arm so as to place a detection instrument on the target insulator string, and enabling the detection instrument to complete the detection operation of the target insulator string; through the method, the detection efficiency of the insulator string is improved.

The invention discloses a power transmission line insulator state detection device and method, and the device comprises a double-layer long hollow-square-shaped cross beam, the top end of the double-layer long hollow-square-shaped cross beam is provided with a suspension cage used for being connected with an unmanned plane in a hanging manner, and the interior of the double-layer long hollow-square-shaped cross beam is provided with a belt walking structure used for moving. A rotation driving module used for driving the belt walking structure to work is installed on one side of the top end of the double-layer long concentric-square-shaped cross beam, and a first semi-open type arc-shaped end plate and a second semi-open type arc-shaped end plate are fixed to the two ends of the double-layer long concentric-square-shaped cross beam respectively. According to the invention, the main camera shoots the top picture of the insulator chain downwards, and the following type rocking visual detection modules on the left and right sides both obtain a part of rotation power of the belt walking structure to act in the walking process so as to continuously carry out visual detection on the side wall and the bottom wall of the insulator chain; therefore, stable hoisting, single-power precise stress application clamping, stable walking and multi-angle visual detection of the device are realized.

This utility model relates to the technical field of surge arresters, specifically a surge arrester for line overvoltage protection, including a surge arrester mounting base, a surge arrester body, an insulator string, and a surge arrester assembly. The surge arrester body is connected to a fixing point on the surge arrester mounting base, and an insulator string is fixed to an external mounting point on the surge arrester body. An insulator string is also provided at a mounting point on the surge arrester assembly. In this utility model, expanding foam is filled inside the plastic cover. The expanding foam can expand and fill the outside of the ceramic ring, connecting ring, and threaded ring, providing anti-collision protection for the ceramic ring, connecting ring, and threaded ring. When the surge arrester terminal is wrapped with rubber, the expanding foam and the plastic cover shield the silicone rubber jacket, preventing cracking and powdering of the transformer inlet terminal under ultraviolet radiation and ozone. The expanding foam and the plastic cover prevent damage to the transformer inlet terminal of the surge arrester.

The invention discloses an insulator internal defect identification method and system based on a terahertz technology, and relates to the technical field of nondestructive detection.The method comprises the steps that firstly, a frequency spectrum obtained after echo signal processing of an insulator is obtained in the healthy state of the insulator and serves as a reference healthy fingerprint; then, echo signals are monitored in real time, the real-time frequency spectrum is compared with the reference frequency spectrum through a state difference value method, and newly-added reflection caused by internal defects such as microcracks is recognized. Furthermore, the invention provides an optimized deployment strategy for installing the sensors at electric field change sensitive positions in the insulator string, and provides a scheme for carrying out data cross validation by adopting multiple sensors for a long insulator string, so that the detection accuracy is improved to the maximum. The system is also integrated with a LoRa wireless communication module, and reliable remote transmission of data in a high-voltage strong electromagnetic interference environment is realized. According to the invention, on-line, lossless and high-precision monitoring of internal defects of the insulator is realized.