74 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.

Provided is a home appliance employing a method for protection against electric shock when a user touches a heat exchanger. The home appliance may comprise: a heat exchanger for performing heat exchange with the outside; a first ground line connecting the heat exchanger and the ground and including a ground resistor; and a second ground line by which the heat exchanger is directly grounded on the basis of a first event by a user, and which is connected to the ground in parallel with the first ground line.

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 invention relates to a method and an insulation monitoring arrangement (10) for insulation monitoring of an electrical system (2) operated with a direct supply voltage (UDC), which has a first insulation resistance (Riso1) between the positive active conductor and earth and a second insulation resistance (Riso2) between the negative active conductor and earth, as well as a functional earthing between the negative active conductor and earth by means of an earthing resistance (path of the functional earthing).To carry out the method, the following steps are carried out: measuring an earth current (IE) flowing in the functional earth path by means of a DC current measuring device (14), measuring the DC supply voltage (UDC) by means of a voltage measuring device (12), calculating the first insulation resistance (Riso1) from the DC supply voltage (UDC) divided by the earth current (IE) by means of a computing unit (20), wherein during operation of the electrical system (2) the condition applies that the second insulation resistance (Riso2) is at least one hundred times greater than the earth resistance (RE).

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.

A mobile machine is operatively attached to a ripper to perform a ripping operation of the terrain substrate by traveling over the terrain surface. The mobile machine may be connected to sensors to measure the ground resistance that opposes the direction of travel of the mobile machine during the ripping operation. If the ground resistance is disproportionate, the mobile machine may perform a shaft adjustment sequence by adjusting one or more of a pitch actuator and a lift actuator to move the ripper relative to the terrain and reduce the ground resistance.

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 utility model provides a pincerlike grounding resistance tester, and relates to the field of resistance testing. The mounting structure is spliced behind the tester body, the contact structure is mounted at the front end of the mounting structure through a supporting head and an outer groove, the U-shaped contact structure is made of a flexible rubber material, three anti-slip strips are fixed above the inner side of the contact structure, and the section of each anti-slip strip made of the rubber material is of a triangular structure. When data is temporarily recorded, the tester body is controlled to automatically incline, so that the circuit is embedded into the contact structure, and if the circuit is thicker, the contact structure fixes the circuit by virtue of an elastic anti-slip manner and is in anti-slip contact with the anti-slip strip, so that the fixing effect on the tester body is improved, the tester body is prevented from slipping off, the tester body is conveniently and temporarily released from the hand, and data recording is performed; the clamp-shaped grounding resistance tester solves the problem that when a common clamp-shaped grounding resistance tester needs to temporarily record data, the clamp-shaped grounding resistance tester needs to be taken down and then record the data, so that the frequent and rapid testing speed is influenced.

The present application relates to the field of power grid protection system protection technology, and in particular to a method for evaluating and warning the hazard of low-amplitude direct lightning strikes in distribution networks. The method comprises: measuring the maximum value of the grounding resistance, the tower height and the tower spacing of the target tower in the distribution network; calculating the corrected grounding shunt coefficient corresponding to each tower according to the maximum value of the grounding resistance of the target tower, the tower height and the tower spacing; obtaining the lightning current amplitude of the distribution network, and calculating the tower top overvoltage of the target tower according to the corrected grounding shunt coefficient, the maximum value of the tower grounding resistance and the lightning current amplitude; when the tower top overvoltage is greater than or equal to the preset tolerance voltage threshold of the target tower, outputting a warning that the distribution network is subject to severe direct lightning strike hazards; otherwise, no warning is output. It aims to solve the problem of how to accurately calculate the tower top overvoltage of the tower.

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 present invention relates to an indirect measurement method of the grounding resistance of a complex grounding network, comprising the following steps: step 1, measuring the resistance value of a simple grounding network not far from the complex grounding network; step 2, connecting the complex grounding network with the simple grounding network, injecting current at both ends of the connecting lead, and then obtaining the total loop resistance; step 3, correcting the loop resistance by measuring the lifting potential of the simple grounding network, and then obtaining the grounding resistance of the complex grounding network. The present invention obtains the resistance value of the complex grounding network through indirect testing while establishing a small grounding body and accurately measuring its grounding resistance.

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 utility model discloses a take-up and pay-off device for ground resistance measurement, and particularly relates to the technical field of take-up and pay-off devices, the take-up and pay-off device for ground resistance measurement comprises a base, the top of the base is sequentially provided with first supports which are symmetrically arranged from left to right, and the take-up and pay-off device can be linked with a motor and continuously drive a first sliding block to drive a guide pipe to move front and back through a flat cable cleaning mechanism; the measuring wire is driven to move, so that the wire wound on the winding disc is uniformly arranged, disorder is avoided, meanwhile, the rotating shaft and the gear are driven to be matched with the rack to drive the gear to rotate, the collecting box is continuously driven to drive the brush ring to reciprocate left and right to brush the surface of the measuring wire, and cleaned impurities are collected into the collecting box. The abrasion of the outer wall of the wire caused by impurities such as soil adhered to the surface is avoided, the service life is shortened, and the practicability is higher; and through the pay-off assembly, the conveying roller below is driven to rotate during pay-off, the measuring wire is conveyed in the direction away from one side of the reciprocating lead screw, and the auxiliary pay-off function is achieved.

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.