60 results about "Ground resistance" patented technology

A method for measuring an earth resistance in a battery charging system connected to the power grid includes, for each measurement cycle, injecting a first, alternating current, signal between a first, neutral node and a second, earth node, detecting a first voltage signal representing an electrical potential difference between the first and second node, calculating an earth resistance value as a function of the first voltage signal. Further, injecting between the first, neutral node and the second, earth node an information signal representing the calculated earth resistance value. Before the injecting the first alternating current signal: detecting one or more information signals generated by further battery charging systems connected to the power grid; determining the earth resistance value based on the information content of the received information signals; proceeding with steps a) to c) if a number of information signals lower than the pre-set limit value is detected.

The invention relates an electric measuring arrangement (10) and to a measuring method both for monitoring a ground connection for an insulation monitoring device (4), which is connected to at least one active conductor (L1, L2) of an ungrounded power supply system (2) and a ground terminal (PE) of an electric installation (3), with an active loop measurement device (20), which is connectable between a ground-connection clamp (E) of the insulation monitoring device (4) and the ground terminal (PE) and has an independent excitation voltage source (UgEKE) for quantitatively determining a ground resistance (REKE) of the ground connection (6) between the insulation monitoring device (4) and the ground terminal (PE).Furthermore, the invention relates to an insulation monitoring device (30) having an electric measuring arrangement (10) according to the invention.

The utility model relates to the technical field of transformer grounding structures, in particular to a transformer grounding structure which comprises flat steel bodies arranged in a vertical state, the lower portions of the flat steel bodies are inserted into the ground and located on one side of a telegraph pole body, the upper portions of the flat steel bodies are located on the ground and provided with a plurality of grounding cable connecting points, and the number of the flat steel bodies is multiple. The plurality of flat steel bodies are distributed along the circumferential side of the telegraph pole body, the upper portions and the lower portions of the plurality of flat steel bodies are locked on the telegraph pole body through the locking hoop rings, the hoop rings are made of conductive materials, the plurality of flat steel bodies are connected in parallel to be grounded, the contact area between the flat steel bodies and the ground is increased, and therefore the grounding resistance in the initial stage of installation of the grounding structure is reduced. The flat steel body is welded on the ground, so that the adaptability of the grounding structure to environment change is further enhanced, the contact area between the flat steel body and the ground can be further increased by welding the conductive anchor cable at the bottom of the flat steel body, the coverage area is wider, and the adaptability to the environment is further enhanced.

The utility model discloses a pincerlike grounding resistance tester, and particularly relates to the technical field of pincerlike grounding resistance testers, the pincerlike grounding resistance tester comprises a resistance tester assembly, the bottom surface of a resistance tester body is provided with a lengthened pulling assembly, and the pincerlike grounding resistance tester only needs to manually pull out an adjusting holding rod, so that the pincerlike grounding resistance can be tested. And after the adjusting holding rod is drawn to a certain length, the adjusting screw rod is screwed back again to fix the adjusting holding rod at the current position, so that the overall length of the pincerlike grounding resistance tester can be conveniently adjusted, the working radius of the pincerlike grounding resistance tester can be increased by changing the overall length of the resistance tester, and meanwhile, the trigger can be pulled through the pull rope, so that the working efficiency is improved. The pull rope passes through the rope passing groove, and the rope passing groove can enable the pull rope to pull the trigger towards the inner side, so that an electric power worker can press the trigger to separate the clamp head, the electric power worker can conveniently use the clamp-shaped grounding resistance tester to test a narrow and deeper area of an electric box, and the practicability is higher.

1. The name of this design product: Split-type ground resistance online tester. 2. Purpose of this design product: used as a ground resistance tester to test ground resistance. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: usage status diagram 7.

The utility model discloses a wind turbine generator lightning protection grounding structure suitable for a rock geologic structure. The wind turbine generator lightning protection grounding structure comprises a vertical grounding electrode communicated with a fan foundation. Grounding drill holes with the number corresponding to that of the vertical grounding electrodes are evenly formed in the periphery of the fan foundation in the circumferential direction, the grounding drill holes penetrate through the high-resistance rock stratum and communicate with the low-resistance rock stratum to form a high-resistance rock stratum section and a low-resistance rock stratum section, rock stratum cracks are formed in the wall face of the high-resistance rock stratum section, and the vertical grounding electrodes are inserted into the grounding drill holes. The bottom end of the vertical grounding electrode penetrates through the grounding drill hole to be inserted into the low-resistance stratum, and graphene transition bodies are filled between the vertical grounding electrode and the high-resistance stratum section of the grounding drill hole and in stratum fractures of the high-resistance stratum section at high pressure. According to the utility model, the resistance value of the grounding resistor of the wind turbine generator in rock geology can be effectively reduced, so that the grounding requirement of the wind turbine generator can be better met, the normal operation of wind turbine generator equipment and the personal safety of personnel can be ensured, and the construction work amount and the material cost can be effectively reduced.

The invention discloses an electromagnetic shielding film and a circuit board, the electromagnetic shielding film comprises a shielding layer, a first surface of the shielding layer is provided with a projection structure, and after the electromagnetic shielding film is laminated with a circuit board substrate provided with an OSP grounding structure through the projection structure, under a preset grounding window size, the grounding resistance of the electromagnetic shielding film is less than 800m omega. The electromagnetic shielding film can be ensured to maintain proper grounding resistance on the OSP grounding structures of different circuit board substrates, so that the grounding effect of the electromagnetic shielding film on the OSP grounding structures of the circuit board substrates is relatively good, and the electromagnetic shielding requirement of the circuit board can be met.

The utility model provides a floating prevention device for a ground source heat pump buried pipe, which belongs to the field of ground source heat pumps and comprises a floating prevention plate and four supporting and adjusting mechanisms used for positioning the floating prevention plate and capable of horizontally adjusting the floating prevention plate, and each supporting and adjusting mechanism comprises a screw capable of penetrating through the floating prevention plate. A supporting disc abutting against the ground is fixed to the bottom of the threaded rod, a fixing cone capable of being inserted into the ground is fixed to the bottom of the supporting disc, the threaded rod is in threaded connection with a supporting nut and a positioning nut, and the floating resisting plate can be adjusted to the horizontal position by adjusting the supporting nut and the positioning nut. According to display of the bubble level, the supporting nut and the positioning nut are accurately adjusted, it is ensured that the floating resisting plate reaches the absolute horizontal state, and therefore it is ensured that the upper end of a pipe opening of the buried pipe is in the horizontal state, good conditions are provided for follow-up pipeline threaded connection, and the problem that due to unsmooth thread meshing, pipeline installation is inconvenient is solved.

The invention belongs to the technical field of wind power grounding configuration, and particularly relates to a configuration device and method suitable for wind power grounding in complex mountainous regions, and the device comprises an inner ring grounding grid, an outer ring grounding grid, and a vertical grounding electrode assembly. A conductive strip is arranged between the adjacent vertical grounding electrode assemblies of the inner ring grounding grid and the outer ring grounding grid. The vertical grounding electrode assembly comprises a welding seat, an electrode column and a supporting cover. The lower side of the welding seat is fixedly connected with an electrode column; a supporting cover is arranged on the outer side of the electrode column; and a resistance reducing material is filled between the supporting cover and the electrode column. Through the arrangement of the inner-ring grounding grid, the outer-ring grounding grid and the vertical grounding electrode assemblies distributed in an array mode, the current of a tower drum can be rapidly guided into the ground, the grounding resistance can be greatly reduced through the resistance reducing material, the influence of geological movement, biological activity or humidity change after construction is small, the high-efficiency attaching contact state with an electrode column can be kept for a long time, and the construction efficiency is improved. And the service life of the grounding device is prolonged.

The invention discloses a grounding resistance tester for electromechanical installation engineering, and relates to the technical field of electromechanical installation engineering, the grounding resistance tester comprises a tester main body, the outer side of the tester main body is rotatably connected with a box body, the side surface of the box body is rotatably connected with a box door, the inner side of the box body is provided with a winding assembly, and the winding assembly comprises a connecting unit arranged at the inner side of the box body. A first winding drum and a second winding drum are rotationally connected to the inner side of the box body, clamping plates are symmetrically and movably connected to the inner sides of the first winding drum and the second winding drum, a wire harness is inserted into the inner sides of the first winding drum and the second winding drum and clamped and fixed through the clamping plates, and the wire harness is stored when the first winding drum rotates. According to the wire harness winding device, by arranging the winding assembly, the rotation speed ratio of the first winding drum to the second winding drum is two fifths, it is ensured that synchronous winding of wire harnesses of different lengths or diameters is completed, and the ending work of a test can be rapidly finished.

The invention discloses a tower horizontal grounding electrode impact effective length calculation method, and the method comprises the steps: building a three-dimensional horizontal grounding electrode model according to the structure size, material attribute and burying condition of a horizontal grounding electrode of a 220kV power transmission line tower; arranging a lightning current excitation source at one end of a grounding electrode of the three-dimensional horizontal grounding electrode model, and simulating lightning impulses with different amplitudes, waveforms and action time; carrying out electromagnetic field simulation calculation, outputting a voltage peak value, a grounding current peak value and current distribution of the grounding electrode, and calculating the impact effective length of the horizontal grounding electrode according to the impact grounding resistance and the geometric parameters of the grounding electrode; adjusting the size and the structure of the grounding electrode to obtain the effective impact length of the horizontal grounding electrode under different conditions so as to optimize the three-dimensional horizontal grounding electrode model; and performing simulation verification on the optimized three-dimensional horizontal grounding electrode model, and if the impact grounding resistance does not meet the standard value, continuing to adjust and optimize and repeating the simulation verification process until the impact grounding resistance meets the standard requirement.

The utility model provides a quick insulation test plug handle of a logging instrument, which is characterized by comprising a handle body, one side of the handle body is in threaded connection with a 41-core aviation socket through a three-combination screw, the other side of the handle body is sequentially sleeved with a 32-core plug and a handle outer cylinder, and the handle outer cylinder is connected with a guide block through a cross countersunk head screw; the device is applied to detection and maintenance of the logging instrument, not only can realize quick connection test of the logging instrument and diagnostic equipment, but also can ensure that the shell of the logging instrument is communicated with the ground wire of the diagnostic equipment, judges whether the cable cores are damaged by measuring the ground resistance of each cable core, and can assist testers in quickly locking the fault position of the instrument.

1. The name of this design product: Open-close type ground resistance online tester. 2. Purpose of this design product: used as a ground resistance tester to test ground resistance. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The invention discloses a grounding electrode ground cone and a grounding method, and belongs to the technical field of power equipment, the grounding electrode ground cone comprises a ground cone main body, a tip end and a hammering structure, a first cavity is arranged in the ground cone main body, and two end parts of the ground cone main body are respectively a first port and a second port which are communicated with the first cavity; the tip is connected to the second port of the ground cone body, a second cavity is formed in the tip and communicates with the first cavity, and a drainage hole communicating with the second cavity is formed in the wall face of the tip; the hammering structure is connected to the outer wall of the ground cone body, and the hammering face of the hammering structure is located outside the projection area of the first port in the axial direction of the ground cone body. The first cavity in the ground cone body is used for containing the resistance reducing agent, the resistance reducing agent continuously enters the ground through the drain hole in the tip end, the grounding resistance value is effectively and continuously kept within the standard range, meanwhile, rapid installation is facilitated through the hammering structure, and the functions of efficient resistance reduction, rapid installation and convenient detection are achieved.

The utility model relates to the technical field of power distribution rooms, in particular to an anti-electric-shock power distribution room safety protection modular device. The grounding device comprises an insulating protective cover, a conducting strip is fixedly arranged on the bottom surface of the insulating protective cover, one side of the conducting strip is electrically connected with a grounding resistance measuring instrument, and one side of the grounding resistance measuring instrument is electrically connected with a grounding mechanism. According to the anti-electric-shock power distribution room safety protection modular device, through the arrangement of the grounding resistance measuring instrument, the grounding mechanism and the circuit breaking protection switch, power distribution equipment is installed in the insulation protection cover, the power distribution equipment is grounded through the conducting strip and the grounding mechanism, the grounding resistance measuring instrument is used for measuring the resistance value, and when the resistance value is abnormal, the circuit breaking protection switch is switched on. Therefore, the controller controls the circuit-breaking protection switch to close the circuit, thereby guaranteeing the good grounding of the power distribution equipment, cutting off the power supply in time when the power distribution equipment is abnormal, and preventing the occurrence of an electric shock accident.

The application relates to the technical field of grounding grids, and discloses a grounding grid construction method for a small-area high-resistance region. According to the limitation of a construction environment, the method adopts a deep-buried grounding grid device combined with a resistance-reducing agent filling and filling mode, so that the earthwork excavation engineering quantity is reduced as much as possible under the condition of the buried depth, the problem of the small geographical environment space of equipment installation and the large installation limitation of the comprehensive grounding device is solved, the construction period is reduced, and the construction operation amount is reduced; the horizontal grounding electrode and the vertical grounding electrode are arranged, and the two are electrically welded in an equipotential manner, so that the grounding resistance effect is better reduced, the technical and economic indexes are optimized, the construction difficulty is reduced, and the safe and stable operation of the grounding equipment is ensured; in addition, the application is a summary of practical engineering application, the present situation that a small-resistance grounding grid relies on a large surface area is improved, and practical experience of implementing deep-well grounding technology in a local small-area region is provided.

The invention relates to an earth screen resistance measuring method, device and equipment, a storage medium and a program product. The method comprises the following steps: generating an initial square wave signal with a preset frequency; filtering and amplifying the initial square wave signal to obtain an excitation electric signal; inputting the excitation electric signal to a voltage generator, so that the voltage generator generates a current signal in the to-be-tested ground grid loop based on the excitation electric signal; obtaining sensing information obtained by sensing the current signal by the induction coil; wherein the induction coil is arranged in a monitoring loop connected with a to-be-detected earth screen; and according to the sensing information and the electric signal information of the excitation electric signal, determining the resistance information of the to-be-tested ground grid. By adopting the method, the resistance of the ground grid can be accurately measured.

The invention provides a fixing device for a street lamp grounding resistance test, which comprises a box body, a placement plate slidably arranged in the box body, a tester placed at the top of the placement plate, a fixing assembly arranged in the placement plate and used for quickly limiting the tester, and a box door rotatably arranged on one side of the box body. A fixing belt is fixedly arranged on one side of the top of the containing plate, a positioning seat is fixedly connected to the other side of the top of the containing plate, the fixing belt is inserted into the positioning seat and fixed through bolts, moving wheels are arranged at the four corners of the bottom of the box body, a lock body is arranged on one side of the box door, and sliding grooves used in cooperation with the containing plate are formed in the two sides of the inner wall of the box body. The top of the box body is fixedly connected with a push rod, and the fixing assembly comprises moving blocks fixedly arranged on the two sides of the bottom of the tester. The fixing device for the street lamp grounding resistance test has the advantages that the tester can be conveniently mounted and dismounted, and meanwhile, the stability of the tester is improved.

The invention discloses a grounding wire state active monitoring device and method suitable for a global distribution network. The device comprises a monitoring module, a control module and a communication transmission module. The monitoring module collects geomorphic characteristics, wind speed, clamping pressure and grounding resistance parameters of a grounding point through a camera and a multi-type sensor. The control module fuses multi-source information based on the improved D-S evidence theory, achieves the safety state evaluation of the grounding wire, and optimizes a communication path through an impedance matching algorithm. And the communication transmission module adopts a LoRa adaptive frequency hopping technology to dynamically adjust radio frequency parameters, so that the reliability of data transmission in a complex environment is ensured. According to the method, the reverse power transmission risk of the distributed power supply can be effectively dealt with, global real-time monitoring, intelligent evaluation and risk early warning of the grounding wire state are realized, and the safety and management efficiency of distribution network maintenance operation are remarkably improved.

The invention relates to the technical field of ocean engineering, and particularly discloses an intelligent pile gripper perpendicularity control system and method based on a fiber bragg grating sensing grid. The fiber bragg grating sensing grid composed of circumferential and axial sensors is arranged on a jaw structure of a pile gripper; the intelligent decision-making control module integrates data fusion and a robust control algorithm, can execute axial stress asymmetric ultra-early warning and bending moment calculation based on sensor data, and generates a control instruction according to the axial stress asymmetric ultra-early warning and bending moment calculation. A triple cooperative control strategy is adopted, specifically, foundation resistance is balanced by adjusting parameters of a pile hammer; when inclination occurs, the pile gripper is driven to conduct rapid correction; according to the large-diameter pile driving perpendicularity control method, crossing from passive deviation correction to active deviation prevention and root correction is achieved, the problems that adjustment is blind and precision is insufficient in a traditional method are solved, and the control precision, efficiency and reliability of the large-diameter pile driving perpendicularity are remarkably improved.

The utility model relates to a movable gate machine, including gate machine main part, support table, a plurality of elevating mechanism, a plurality of sensor, wheel subassembly, gate machine main part sets up on the support table, elevating mechanism includes elevating drive piece, support plate, elevating drive piece is used for driving the support table along the vertical direction to move, elevating drive piece includes drive body and drive shaft, the drive body is equipped with the support plate. The driving body is connected with the supporting table, the driving shaft extends in the vertical direction, and a supporting plate is arranged at the lower end of the driving shaft and used for abutting against the ground; the sensors are in one-to-one correspondence with the lifting driving pieces and connected with the supporting plate, and the sensing ends of the sensors are used for sensing the ground; the wheel assembly is arranged on the lower side of the supporting table and comprises a plurality of moving wheels. According to the movable gate machine provided by the utility model, the lifting mechanism, the sensor and the wheel assembly are arranged, so that personnel can move the gate machine without other equipment, and the operation is convenient and rapid; the device is suitable for various outdoor and indoor road surfaces and slopes, and smooth movement is guaranteed.

The utility model discloses a lightning protection junction box of a sensor, which relates to the technical field of junction boxes, and comprises a box body, the front end of the box body is movably connected with a box cover, the inner side of the box body is fixedly connected with an insulating shell, a conductive frame is fixedly connected between the box body and the insulating shell, and the inner side of the insulating shell is fixedly connected with a wiring terminal strip. According to the utility model, the conductive frame grounding structure forms a low-impedance thunder and lightning discharge loop, the grounding resistance is low, the thunder and lightning response speed is fast, the thunder and lightning energy can be rapidly guided into the ground, the sensor is effectively protected from being damaged by the thunder and lightning, and the reliability of the sensor is improved. The fault rate of the sensor caused by lightning stroke is greatly reduced, the clamping plate and the adjusting ring form an adjustable fixing assembly, self-adaptive adjustment can be carried out according to the diameter of a cable, rapid locking and unlocking of the box cover can be achieved through knob operation, other tools are not needed, and the mounting and dismounting efficiency is improved.

The utility model relates to the field of ground resistance detection, and discloses a ground resistance detection alarm device based on a quantitative loading tank truck, which comprises a support frame, the front side of the support frame is fixedly connected with a mounting seat, the front side of the mounting seat is connected with a mounting block through a plug-in assembly, and the front side of the mounting block is fixedly connected with a detection alarm body. A limiting ring is rotatably connected to the top side of the mounting seat, a limiting assembly is arranged at one end of the limiting ring and used for mounting the detection alarm body, winding rollers are rotatably connected to the two sides of the supporting frame, a fixing block is fixedly connected to the outer wall of the supporting frame, and a sliding rod is slidably connected to the outer wall of the fixing block. According to the utility model, the detection alarm body can be quickly disassembled through simple stirring and rotating operations, so that the maintenance efficiency is improved, and the maintenance cost is reduced; by means of spring resetting and clamping structures, orderly winding of wires is achieved, disorder is avoided, safe operation of equipment is ensured, the service life of the wires is prolonged, and meanwhile the cleanliness of the equipment is improved.

The utility model relates to gas pipeline technical field discloses a kind of connecting piece for roofing gas pipeline lightning protection and static electricity prevention, including connecting steel pipe and gas pipeline, the side surface welding of connecting steel pipe has flat steel, the top sliding connection of flat steel has disconnecting card, the inside fixed connection of disconnecting card has installation shell, the inside installation of installation shell has positioning assembly, the end fixed connection of connecting steel pipe has connecting shell, the inside installation of connecting shell has docking assembly, the end of gas pipeline is arranged in the inside of docking assembly;The positioning assembly includes fixed link, and the inside fixed connection of fixed link is in installation shell. In the utility model, moving plate drives block one and inserts flat steel slot, quickly connects disconnecting card, it is convenient for grounding resistance detection, connecting steel pipe and gas pipeline can be installed synchronously after docking, avoid later construction to destroy pipeline and anticorrosive layer, reduce construction difficulty, improve work efficiency.

The invention relates to the technical field of lightning protection grounding, in particular to a manufacturing technology of a lightning protection grounding device of a novel electric contact material, and discloses a grounding device of a flexible graphite lightning protection grounding body. The lightning protection device further comprises a positioning sleeve frame used for positioning and guiding, a lightning protection frame part used for lightning receiving and power transmission, a grounding insertion pile used for grounding and current diffusion, and an auxiliary pile pressing part used for assisting installation of the grounding insertion pile, and a flexible graphite lightning protection connection wire is adopted as a core conduction component, and a graphite column is adopted as a core grounding component. The problems of grounding resistance increase and function failure caused by corrosion of a traditional metal grounding electrode are avoided, and frequent maintenance and replacement are not needed. The flexible graphite lightning protection connecting wire is good in flexibility, not prone to breakage, capable of meeting wiring requirements of different installation scenes, convenient and fast to install, capable of saving labor and accurate in positioning, labor-saving pressing-in of the grounding inserting pile is achieved through structures such as a pedal frame and a pull-down chuck piece of the auxiliary pile pressing part, manual hammering or large machines are not needed, and operation is convenient and fast.

The application provides a motorized field special container grounding device, which comprises a grounding plate, a stainless steel hinge plating, a pure copper wire woven belt and a grounding wire hole, is fixedly arranged in a trench under the soil ground level, and is covered by pouring a mixed liquid of low-resistance high-capacitance electrolyte material and water into the trench. The stainless steel hinge plating is used for mechanical connection between the grounding plates, the pure copper wire woven belt is used for electrical soft connection of the center part of the grounding plate, and the grounding wire hole is connected with a grounding wire which is connected with a load equipment on the ground. The motorized field special container grounding device can realize the basic requirement of less than 1 ohm grounding resistance, thereby reducing the equipment failure caused by high grounding resistance, the equipment failure and personal safety accident caused by lightning, and solving the problems of motorization, rapidness, repeated use and the like.

The invention provides a generator grounding method based on a wind generating set, which relates to the field of wind driven generators, and comprises the following steps: expanding the capacity of a ground loop: adding the ground loop to a grounding system, adding a grounding carbon brush at the position of a brake disc, optimizing the installation process, and reducing the grounding resistance by virtue of equipotential point characteristics. Original two groups of grounding loops of a grounding system are transformed into three groups of grounding loops, newly added carbon brushes and original carbon brushes form an equipotential redundant path, and a single generator is provided with six grounding carbon brushes in total. According to insulation isolation arrangement, an insulation structure is arranged between the brake disc and the high-speed shaft, circulation is prevented from being formed through conduction, and therefore related parts are protected. Differentiated configuration: the number of grounding devices is adjusted according to the type of the coupler so as to adapt to the requirements of different models. The safety and the operation efficiency of the wind power generation equipment are remarkably improved.

The invention discloses an ocean equipment distribution line ground fault monitoring system and method, and particularly relates to the technical field of line ground fault monitoring, the ocean equipment distribution line ground fault monitoring system comprises a multi-state sampling module, a self-adaptive resolving module, an isolation transmission module and a fault switching module, four equivalent circuit models are constructed, and time-sharing dynamic sampling of positive and negative grounding resistors is realized; the self-adaptive calculation module synchronously calculates a grounding resistance value and judges a fault by utilizing a self-adaptive compensation algorithm based on simultaneous binary linear equations and combining temperature drift correction and weighted average filtering; the isolation transmission module adopts a high-voltage-withstanding transformer isolation type amplifier, so that reliable signal transmission in a high-water-pressure environment is ensured; the fault switching module cooperates with the mechanical relay through the solid-state relay to realize fault arc-free isolation. According to the invention, the online monitoring precision, safety and environmental adaptability of the grounding fault of the marine equipment distribution line are significantly improved.