1678 results about "Grounding line" patented technology

The invention provides a tumor electric field treatment system, an electrode slice temperature detection method and an electrode slice anomaly detection method, the system comprises an electrode slice and an adapter provided with a first controller, the electrode slice comprises a plurality of electrode units and a plurality of temperature detection units, the plurality of temperature detection units are divided into a plurality of row groups and a plurality of column groups, and the first controller is connected with the adapter. The grounding ends of the temperature detection units in each row group are jointly connected to the same grounding wire, and the signal ends of the temperature detection units in each column group are connected to the same dual-purpose signal wire after being in short circuit with the corresponding electrode units; when the dual-purpose signal line is connected to the temperature sampling point, the grounding wires are sequentially conducted, so that temperature detection signals detected by the temperature detection units are sampled based on the temperature sampling point; when the dual-purpose signal line is connected to the alternating power line, alternating electric signals are transmitted to the electrode units. Therefore, the temperature of the electrode plate can be detected by using fewer conductive traces, and whether the electrode plate is abnormal or not can be judged through temperature detection.

The invention provides a ground wire monitoring method and system, and relates to the technical field of ground wire monitoring. The method comprises the following steps: acquiring a voltage signal of an injection point and a current signal of a grounding loop; preprocessing the signal to obtain a preprocessed signal; according to the preprocessed signals, impedance frequency spectrums of the grounding loop under different frequencies are obtained through calculation, and key feature parameters in the impedance frequency spectrums are extracted; environment parameters and operation state data of the power equipment are collected and fused with the key feature parameters, and fused data are obtained; adjusting a judgment threshold value or a reference baseline corresponding to the key feature parameters by using the fused data; and judging the current grounding loop state by using the adjusted judgment threshold value or reference baseline. According to the method, based on impedance spectrum analysis, electromagnetic interference is overcome through multi-stage signal processing, robust feature extraction and multi-dimensional data fusion analysis, and the effects of adapting to a dynamic baseline and distinguishing different electric leakage types are achieved.

The invention provides a tumor electric field treatment system, an electrode slice temperature detection method and an electrode slice anomaly detection method, the system comprises an alternating current signal generator, an electrode slice and a controller, the electrode slice comprises a plurality of electrode units and a plurality of temperature detection units, the plurality of temperature detection units are divided into a plurality of row groups and a plurality of column groups, and the plurality of electrode units are connected with the controller. The grounding ends of the temperature detection units in each row group are jointly connected to the same grounding wire, and the signal ends of the temperature detection units in each column group are connected to the same dual-purpose signal wire after being in short circuit with the corresponding electrode units; when the dual-purpose signal line is connected to the temperature sampling point, the grounding wires are sequentially conducted, so that temperature detection signals detected by the temperature detection units are sampled based on the temperature sampling point; when the dual-purpose signal line is connected to the alternating power line, alternating electric signals are transmitted to the electrode units. Therefore, the temperature of the electrode plate can be detected by using fewer conductive traces, and whether the electrode plate is abnormal or not can be judged through temperature detection.

A tool for hanging and disassembling a grounding wire of a power transmission line tower through an unmanned aerial vehicle comprises the unmanned aerial vehicle, a detachable connecting rod frame is installed on the unmanned aerial vehicle, and two hanging rings are connected to the bottom end of the connecting rod frame. And the high-altitude falling risk and the induced electric shock hidden danger caused by manual tower climbing are thoroughly eliminated. An operator can perform remote control on the ground and is prevented from being directly exposed to a high-voltage electric field and a severe tower environment, so that the life safety of the operator is fundamentally guaranteed, and the system conforms to the development trend of'few-person and unmanned 'operation and maintenance of an intelligent power grid. The unmanned aerial vehicle can quickly pass through complex terrains to approach an operation point, is particularly suitable for special tower positions such as mountainous areas and cross rivers, greatly improves the operation efficiency, and remarkably improves the operation safety. A traditional manual grounding wire hanging and dismounting mode is changed, the device is not influenced by the terrain and the tower type, the operation process is convenient and fast, the maintenance operation time is shortened, the labor intensity is reduced, and the personal safety is ensured.

The invention relates to the technical field of power equipment monitoring, in particular to a ground wire state intelligent monitoring method based on multi-modal information fusion, which comprises the following steps: acquiring ground wire multi-modal monitoring data including image data, inertial sensing data and time sequence task data; a deep learning target detection algorithm is adopted for the image data to identify key components in the image, wherein the key components at least comprise a wire clamp, a connecting bolt and a hanging point; the preliminary judgment is based on the identified key components, the spatial relation features, geometric features and visual features of all the components are analyzed, and a preliminary result of the state of the grounding wire is generated according to a preset judgment rule; fusion verification: performing multi-modal fusion verification on the judged preliminary result, the attitude data and the time sequence task data, and outputting a final state judgment result; according to the invention, by fusing the image data, the inertial sensing data and the time sequence task data, accurate judgment and graded early warning of the hitching state of the ground wire are realized, and the safety risk of electric power overhaul operation is reduced.

The invention provides a tumor electric field treatment system, an electrode slice temperature detection method and an electrode slice anomaly detection method, the system comprises an electrode slice and an adapter provided with a first controller, the electrode slice comprises a plurality of electrode units and a plurality of temperature detection units, the plurality of temperature detection units are divided into a plurality of row groups and a plurality of column groups, and the first controller is connected with the adapter. The grounding ends of the temperature detection units in each row group are jointly connected to the same grounding wire, and the signal ends of the temperature detection units in each column group are connected to the same dual-purpose signal wire after being in short circuit with the corresponding electrode units; when the dual-purpose signal line is connected to the temperature sampling point, the grounding wires are sequentially conducted, so that temperature detection signals detected by the temperature detection units are sampled based on the temperature sampling point; when the dual-purpose signal line is connected to the alternating power line, alternating electric signals are transmitted to the electrode units. Therefore, the temperature of the electrode plate can be detected by using fewer conductive traces, and whether the electrode plate is abnormal or not can be judged through temperature detection.

The invention discloses a cable operation environment optimization method based on cable trench collection information, and relates to the technical field of intelligent operation and maintenance of a power system, and the method comprises the steps: collecting an original parameter data set in a cable trench; a pulse current signal is collected at a cable grounding wire connection point, and a standard pulse discharge capacity sequence is generated through band-pass filtering and amplitude integral conversion; based on the original relative humidity measurement value and the environment temperature value, calculating a compensated relative humidity value through a multi-scale heat conduction-diffusion coupling equation; calculating a cable insulation risk index through a quantum annealing algorithm by using the compensated relative humidity value and the standard pulse discharge capacity sequence; the dynamic measurement deviation of the temperature and humidity sensor is subjected to double compensation of thermal radiation and molecular adsorption by constructing a multi-scale heat conduction-diffusion coupling equation, so that the reliability of environmental state sensing is greatly improved, and the operation safety, stability and intelligent operation and maintenance level of a power cable system are effectively enhanced.

The invention provides an electric power operation ground wire intelligent positioning and early warning control method and system, and relates to the technical field of electric power operation safety monitoring, and the method comprises the steps: constructing a double-layer architecture cooperative intelligent positioning system, processing multi-source sensing data through employing a self-adaptive particle swarm optimization data fusion algorithm, and optimizing a spatial topological relation through a graph attention mechanism; extracting features from the time sequence state sequence by adopting multi-scale and cavity convolution, and constructing a space-time double-flow heterogeneous graph; and in combination with a power operation field knowledge graph and Monte Carlo tree search, risk early warning scoring is realized. According to the invention, the grounding wire position monitoring precision and the risk early warning accuracy are improved, and the power operation safety guarantee capability is enhanced.

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 relates to the technical field of power transmission and distribution overhead lines, and discloses a power transmission and distribution overhead line ground wire monitoring method, a positioning forwarding circuit and a device, which are used for improving the accuracy and efficiency of ground wire hanging and dismounting management. The power transmission and distribution overhead line grounding wire monitoring method comprises the steps of obtaining operation task information, obtaining and selecting a target tower, and performing navigation operation based on geographic coordinates of the target tower; after a navigation designated position is reached according to the navigation information, a mobile terminal is used for carrying out coordinate positioning checking on a target tower, grounding hitching operation processing is carried out after checking is correct, hitching position coordinates and real-time hitching and detaching state information of a target grounding wire are collected in real time through a grounding wire monitoring device, and whether hitching succeeds or not is judged through a cloud server side; if hitching is successful, hitching success confirmation information is displayed on the mobile terminal, the operation state is updated, and hitching success records and related information are stored in a database.

The invention belongs to the technical field of equipment state monitoring and fault diagnosis, and relates to a pole-mounted switch damp defect diagnosis method and system based on multi-source information fusion, and the method comprises the steps: collecting a leakage current signal and a high-frequency pulse current signal flowing through a grounding wire in real time, and environment parameters around a target pole-mounted switch; preprocessing the leakage current signal and the high-frequency pulse current signal, and performing feature extraction based on the preprocessed leakage current signal, the preprocessed high-frequency pulse current signal and environmental parameters to obtain a leakage current feature quantity, a high-frequency discharge feature quantity and an environmental coupling factor; and based on the leakage current characteristic quantity, the high-frequency discharge characteristic quantity and the environment coupling factor, judging a damp fault of the target pole-mounted switch, and combining a D-S evidence theory and fusing multi-source information confidence to complete damp defect diagnosis of the target pole-mounted switch. According to the invention, complementarity between different information sources can be fully utilized, and the damp state of the pole-mounted switch can be accurately judged.

The invention provides a grounding wire state monitoring and early warning system and method based on a random forest algorithm, relates to the technical field of electric power safety monitoring, and solves the limitation problems of low efficiency, poor data continuity, inaccurate early warning judgment and the like in the existing scheme. In the system, a multi-source sensor network acquires multi-dimensional operation data corresponding to a grounding wire and transmits the data to a data acquisition terminal; the data acquisition terminal performs feature extraction processing to generate a feature vector set and uploads the feature vector set to the cloud data processing platform; the cloud data processing platform uses a random forest classification model, based on the feature vector set, realizes dynamic feature weight adjustment through feature importance analysis, constructs a hierarchical decision tree structure, identifies and outputs a grounding wire fault mode, and issues the grounding wire fault mode to the local early warning terminal; and the local early warning terminal provides early warning information for the ground wire site by adopting a graded and differentiated early warning mode. According to the invention, high-precision early warning and predictive maintenance of the state of the grounding wire are effectively realized.

The invention belongs to the technical field of high-voltage line grounding equipment, and particularly relates to a lockable grounding wire clamp device mounted by an unmanned aerial vehicle and a method for introducing backflow in a high-voltage line into the ground, and the lockable grounding wire clamp device mounted by the unmanned aerial vehicle can be carried by the unmanned aerial vehicle to complete grounding operation of the high-voltage line in maintenance. The lockable grounding wire clamp device is time-saving and safe for on-site constructors, a unique locking and unlocking mechanism composed of a lock cylinder, a clamping jaw assembly, a spring bolt driving piece and an unmanned aerial vehicle mounting assembly enables a high-voltage wire to enter a high-voltage wire claw embracing area, and then high-voltage wire claw embracing can be completed under the self-gravity effect of the lockable grounding wire clamp device; according to the invention, connection and locking of the high-voltage line are realized, the locking mode is relatively reliable, unlocking can be realized only by pulling up the unmanned aerial vehicle mounting assembly, and safe grounding in adverse weather such as strong wind is realized. When the unmanned aerial vehicle needs to be taken down, unlocking can be achieved by connecting the unmanned aerial vehicle with the unmanned aerial vehicle mounting assembly and pulling the unmanned aerial vehicle mounting assembly upwards, and unlocking is convenient and fast.

The invention relates to the technical field of antennas, and discloses a reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation, which comprises a control circuit, and a first polarization grid layer, a first dielectric layer, M * N resonant sheets, a second dielectric layer and a second polarization grid layer which are sequentially arranged, the resonance piece comprises a radiation part, a grounding wire, four extension parts and two PIN diodes, the four extension parts are symmetrically arranged on the periphery of the radiation part and are connected with the radiation part, and the two PIN diodes are respectively arranged on two adjacent extension parts and are respectively connected with the upper polarization grid layer and the lower polarization grid layer through bending wires on the extension parts and metal columns in the dielectric layer; one end of the grounding wire is connected with the radiation part, and the other end is connected with direct-current ground; and the control circuit controls the connection and disconnection of the PIN diode through the polarization gate layer to realize a transmission mode or a reflection mode. The reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation is relatively simple in structure, and loss can be reduced.

The invention relates to the technical field of grounding devices, and provides a grounding device and a power system.The grounding device is used for connecting a three-phase wire to a grounding grid and comprises a supporting piece, a first conductive piece, a second conductive piece, a grounding assembly and a limiting assembly. The first conductive part is rotatably connected to the supporting part, the second conductive part is rotatably connected to the supporting part, the second conductive part and the first conductive part define a limiting cavity, the supporting part and a first wire in the three-phase wires are located in the limiting cavity, one end of the grounding assembly is connected to the first wire, and the other end of the grounding assembly is connected to the ground screen. The limiting assembly is rotatably connected to at least one of the first conductive piece and the second conductive piece, the limiting assembly is provided with a limiting part, and the limiting part is connected to at least one of a second wire and a third wire in the three-phase wires. According to the invention, the problems of complex operation and low operation efficiency in manual installation of the grounding wire on the three-phase wire can be solved.

The invention discloses a ground wire full life cycle management method, relates to the technical field of power equipment asset management, and aims to solve the problems that manual recording is easy to tamper, cloud diagnosis delay is high and an alarm mode is single and easy to neglect in traditional ground wire management. According to the method, operation fingerprints and spatio-temporal information during grounding wire hooking are recorded through the block chain technology, and it is ensured that data cannot be tampered; a built-in lightweight AI model of the edge computing unit is used for analyzing sensor data in real time to carry out localized fault diagnosis; and triggering a multi-mode sound-light alarm controlled by the PWM signal according to the diagnosis result grade. The system realizes full-life-cycle credible traceability, sub-second fault response and high-recognition-rate alarm of the state of the grounding wire, and is suitable for intelligent operation and maintenance of the grounding wire in the field of a transformer substation and the like.

The invention provides an unmanned aerial vehicle ground wire hanging and dismounting robot for medium and low voltage power transmission lines, which is an unmanned aerial vehicle and is provided with ground wire hanging and dismounting equipment at the bottom. The ground wire hanging and dismounting equipment comprises a mechanical arm with a quick-change male head, and further comprises a bistable hanging and dismounting device for fixing a ground wire through a ground cover plate. A quick-change female head is arranged at the tail end of the bistable hanging and dismounting device, and an electric push rod and a clamping jaw are arranged at the head end; when the unmanned aerial vehicle installs a grounding wire, the clamping jaw impacts a grounding hanging ring of a power transmission line through flying to trigger the hanging and dismounting triggering structure, the hanging and dismounting triggering structure drives the quick-change female head and the quick-change male head to be separated and meanwhile gathers the clamping jaw, and the grounding wire is hung at the grounding hanging ring through the bistable hanging and dismounting device separated from the unmanned aerial vehicle. The quick-change male head of the mechanical arm is used for clamping the bistable hanging and dismounting device at the grounding hanging ring, and then the electric push rod is driven to enable the clamping jaw to loosen the grounding hanging ring; the operation efficiency of hanging and detaching the ground wire can be improved, and efficient and safe unmanned operation is achieved.

The invention belongs to the technical field of power construction safety, and particularly provides a grounding clamp device based on unmanned aerial vehicle control, which comprises an inverted J-shaped shell, and a clamping mechanism and a releasing mechanism fixedly arranged in the shell, the upper part of the grounding clamp is provided with a clamping port used for clamping a wire. A clamping and releasing pin is arranged at the top of the shell, and the clamping and releasing pin can be separated from the shell after the wire is clamped; the lower end of the shell is fixedly provided with a grounding wire base used for being connected with a grounding wire. The clamping mechanism comprises a clamping arm, a main spring and a trigger rod, and can realize automatic clamping of a wire; and the release mechanism comprises a release handle part, a release pull rod, a release block and a tension spring, and can quickly relieve the clamping and fixing effect of the clamping mechanism on the wire, so that the grounding clamp is separated from the wire. The ground clamp is provided with an automatic wire clamping and releasing mechanism, can be matched with an unmanned aerial vehicle to install and release the ground clamp, is high in clamping reliability, is simple in releasing operation, and is suitable for the maintenance of a high-voltage transmission line.

The invention relates to the technical field of power system security, and particularly discloses a ground wire management operation system based on ground wire cabinet monitoring, which comprises a physical sensing layer, an edge computing layer, a block chain consensus layer and an application service layer. The physical sensing layer collects the identity, the in-place state and the electrical parameters of the grounding wire; the edge calculation layer carries out local data processing and event judgment; the block chain consensus layer realizes data credible evidence storage and cross-domain sharing through an intelligent contract and a distributed account book; and the application service layer provides asset panoramic display, cooperative verification and risk early warning services. Through the above architecture, unified management and safety collaboration of data of the whole life cycle of the grounding wire are realized, and the safety operation and maintenance level of a power grid is improved.

The invention provides a ground wire dismounting and hanging device based on an unmanned aerial vehicle, which is connected between a power transmission line and a ground wire, and comprises a hook which comprises a hanging part and a mounting part connected with the hanging part, the hanging part is provided with a channel for accommodating the power transmission line, and the mounting part is connected with the ground wire; the two fixing pieces are distributed on the hanging part in a mirror image mode, each fixing piece comprises a fixing part corresponding to the channel, an adjusting part connected with the fixing part and a mounting pin connected between the fixing part and the adjusting part, and the mounting pins are rotationally arranged on the hanging part; the adjusting parts are provided with first mounting rods, the two ends of the adjusting rope are connected with the first mounting rods of the two adjusting parts respectively, and when the adjusting rope is pulled by external force, the adjusting parts drive the fixing parts to rotate around the mounting pins so as to open the channel. According to the device, extra pulling force does not need to be applied to the hook, manpower consumption is reduced, a power transmission line is prevented from being damaged, the cost of the whole device is reduced, the overall structure is simplified, and the later maintenance cost of the device is reduced.

The invention provides an inverter and a grid-connected and off-grid switching device and method thereof, and the device comprises a grid-connected switch which is disposed between an AC side grid-connected port of the inverter and a power grid; the off-grid switch is arranged between the alternating current side off-grid port of the inverter and the load; the grounding switch is configured to be used for controlling connection and disconnection between a neutral line of the inverter and a protective ground line; the control module is configured to control the grid-connected switch and the off-grid switch to be switched on and control the grounding switch to be switched off when the inverter is in a grid-connected state; and when the inverter is in the off-grid state, the grid-connected switch is controlled to be switched off, and the off-grid switch and the grounding switch are controlled to be switched on. The device ensures that the grounding switch and the grid-connected switch are not in a conducting state at the same time, and the safety of the inverter is ensured.

The utility model relates to a grounding wire clamp which comprises a grounding ring and a wire clamp body. One side of the grounding ring is provided with a rod part connected with the wire clamp body, two sides of the grounding ring are fixedly provided with insulating sleeves, and a polished rod used for grounding is reserved between the insulating sleeves. Sliding grooves are formed in the insulating sleeves on the two sides of the polished rod, insulating sliding sleeves are slidably connected into the sliding grooves, springs are installed between the insulating sliding sleeves and the bottoms of the sliding grooves, and the springs have elastic force for pushing the insulating sliding sleeves out of the sliding grooves. The insulating sliding sleeves with the spring mechanisms are arranged on the two sides of the grounding ring, so that the grounding polish rod is effectively protected. When the polish rod is not used, the insulation sliding sleeve automatically slides out to completely wrap the polish rod, the polish rod is prevented from being exposed, the electric shock danger caused by mistaken touch of personnel is avoided, meanwhile, the risk that the polish rod is affected with damp or corroded is reduced, and safety is improved. When grounding operation needs to be carried out, a user can enable the insulation sliding sleeve to retract through simple actions, only a small part of the polished rod used for connection is exposed, the effectiveness of grounding is guaranteed, and the use safety is improved at the same time.

The invention provides a water immersion and electric leakage monitoring method, device, system and equipment for power equipment, and relates to the technical field of power equipment safety monitoring. The method comprises the following steps: acquiring electrical monitoring data of a grounding wire of power equipment and water level monitoring data of an area where the power equipment is located; judging whether an electric leakage event occurs or not according to the electrical monitoring data; water immersion event judgment is conducted according to the water level monitoring data, when the water level monitoring data exceed a preset water level threshold value, visual review operation is triggered, and whether a water immersion event occurs or not is judged based on the result of the visual review operation; and determining different alarm levels according to a combination condition between the judgment result of the water immersion event and the judgment result of the electric leakage event, and executing alarm responses corresponding to the alarm levels. According to the method, the electrical monitoring data is obtained in a non-contact manner, and a dual verification mechanism of'water level threshold triggering + visual rechecking 'is established, so that the water immersion and electric leakage states of the electrical equipment can be quickly and accurately identified.

The invention discloses a digital grounding wire device, and belongs to the technical field of power equipment, the digital grounding wire device comprises a base and a grounding wire mechanism, the grounding wire mechanism comprises universal wheels, a supporting frame, a sliding rail, a rotating column, a moving frame, a positioning assembly, a lifting assembly, a drilling assembly, a clamping assembly and an adjusting assembly; a supporting frame is fixedly installed on the base, a sliding rail can rotate on the supporting frame through an adjusting assembly, a drilling assembly and a clamping assembly are arranged on the two sides of the sliding rail, drilling operation can be conducted on the ground through the drilling assembly, and then the clamping assembly drives a grounding pin to be inserted into a hole. The drilling assembly and the clamping assembly conduct lifting operation through the lifting assembly, the position of the movable frame on the sliding rail can be fixed through the positioning assembly, the position is kept fixed when the drilling device is not used, the operation process is convenient and fast, automatic grounding wire operation can be achieved, and the working efficiency is improved.

The invention relates to a grounding wire positioning method and system based on a deep residual network. The method comprises the steps of firstly collecting grounding wire signals and performing preprocessing to generate a data set, then extracting multi-scale features by using an improved Teager-Kaiser energy operator, outputting a time-frequency energy spectrogram, then constructing a positioning model containing a deep residual network, training the model by a multi-task learning framework and a loss function based on the time-frequency energy spectrogram, and finally obtaining a positioning model containing a deep residual network. And carrying out lightweight processing on the trained model, deploying the model to an edge terminal, collecting a grounding wire signal in real time, and inputting the grounding wire signal into the lightweight model of the edge terminal, thereby outputting the real-time space coordinate and position state of the grounding wire. Compared with the prior art, the method has the advantages of high positioning precision, strong anti-interference performance, good real-time performance and the like.

The invention relates to the technical field of wind driven generators, in particular to a system for reducing generator shaft current damage and a working method.The system is characterized in that a generator spindle is connected with a generator shell through at least one insulating bearing, and at least one grounding ring is further arranged on the generator spindle; the grounding ring is grounded through a carbon brush and a grounding wire which are connected in sequence; the grounding wire is provided with a current transformer, and the current transformer is used for obtaining grounding current data and transmitting the grounding current data to the data processing end. And the data processing end is used for predicting working state data of the insulating bearing based on the grounding current data, the data of the environment where the fan is located, the fan operation data and the insulating bearing data, and evaluating whether a shaft current risk alarm is sent or not based on the working state data of the insulating bearing. By monitoring and evaluating the working state of the insulating bearing of the system, operation and maintenance personnel can master the working state of the insulating material of the insulating bearing at any time, and the situation that equipment is damaged by shaft current due to failure of the insulating material is avoided.

The invention relates to the technical field of pay-off, and discloses a take-up and pay-off device for a flaky grounding wire, which comprises two pay-off racks arranged side by side, a fixed block arranged between the two pay-off racks, and moving wheels arranged on the lower surfaces of the pay-off racks; the rotating shaft is arranged on the inner side of a containing groove formed in the inner side of the pay-off rack, bearings are rotationally installed at the two ends of the rotating shaft, and limiting protruding blocks are fixed to the middles of the outer surfaces of the bearings; the first guide groove is formed in the inner side wall of the accommodating groove so as to be matched with the limiting convex block; during paying-off, the paying-off frame can be pushed to move without bending down, so that the ground wire coil rolls on the ground for paying-off, the vertical state of the coil body can be well guaranteed during paying-off, the situation that a paid-off ground wire path is distorted due to deflection is reduced, and the situation that after paying-off is conducted to a proper length, manual bending down is needed, and the labor intensity is reduced is reduced. And therefore, the wire cutting device is easy to use.

The invention discloses a grounding line selection method fusing transient energy and waveform correlation, and the method comprises the steps: extracting a high-frequency component in a zero-sequence current through employing an anti-mode aliasing effect VMD, and obtaining the energy of the high-frequency component through Hilbert transformation; then, correlation analysis is carried out on the zero-sequence current to extract a transient waveform comprehensive correlation coefficient; and forming a fault feature vector by the high-frequency component energy and the transient waveform comprehensive correlation coefficient, inputting the fault feature vector to an extreme learning machine without threshold setting, training ELM by using simulation fault data, and obtaining a fault line selection model based on the ELM to realize grounding fault line selection. According to the method, the endpoint effect and the mode aliasing phenomenon occurring in EMD can be effectively avoided, the transient current comprehensive correlation coefficient is extracted, and the line selection accuracy during high-resistance grounding is guaranteed.

The invention discloses a grounding line sensing method based on charged quantity time sequence analysis, and the method achieves the precise judgment of whether equipment is charged or not through collecting the current, voltage, three-dimensional coordinates and other key parameters of a grounding line in real time, and combining the time sequence data analysis of the charged quantity, avoids the mistaken dismounting risk caused by instantaneous fluctuation or misjudgment, and improves the reliability of the grounding line. And the judgment accuracy of the dismantling link and the operation decision scientificity are effectively improved. According to the method, information of a power grid graph platform and a power transmission topological structure is fully fused, a space risk association graph between an operation hanging point and adjacent equipment is constructed, an electrified risk area is dynamically evaluated, personnel positioning information is overlaid, and whether operators are in a safe distance range or not is comprehensively judged. According to the mechanism, dynamic linkage and combined judgment of multi-source information are realized, and the space risk identification and safety management and control capabilities of a working site are remarkably enhanced.

The utility model discloses a concrete vibrator with a built-in normal-pressure high-frequency motor special for equipment, and belongs to the technical field of engineering machinery. According to the technical scheme, the front end of a sleeve of the vibrator is connected with a pointed end through threads, and an oil cover, two sets of lower bearings, an oil seal cover, a coil inserting stator and a bearing seat are sequentially arranged in the sleeve; an upper bearing is arranged in the bearing seat, a rotor is supported by the lower bearing and the upper bearing, and an eccentric block and an oil suction pipe are arranged at the lower end of the rotor; the upper end of the sleeve is connected with an upper cover through threads, a wiring terminal and a wiring seat are arranged in the upper cover, a cable is fixed on the wiring terminal through a thread pair I, the cable is connected with a frequency conversion control cabinet fixed on equipment, and an electronic frequency converter and a grounding wire are arranged in the frequency conversion control cabinet. The upper cover is connected with four symmetrically-arranged rubber springs through a connecting pipe and a lower clamping plate and is connected with equipment through an upper clamping plate and an equipment connecting plate by using a thread pair II. The vibrator has the advantages of overcoming the defects of an existing vibrator for equipment, and being novel in design, reasonable in structure, safe and reliable.