13results about How to "Reduce ground resistance" patented technology

The invention discloses a multi-point grounding current limiting device, and relates to the technical field of power transmission line construction, the multi-point grounding current limiting device comprises a placement frame and further comprises a protection assembly, a grounding rod is fixedly installed at the bottom of the placement frame, a placement plate is fixedly installed on the inner wall of the placement frame, and a placement rod is fixedly installed at the top of the placement plate; lifting equipment is arranged on the circumferential surface of the placement rod, a signal receiver is fixedly mounted at the top of the lifting equipment, a current limiting assembly is arranged at the top of the placement plate, a fusing assembly is arranged at the top of the placement plate, a grounding connecting wire is arranged between the fusing assembly and the current limiting assembly, and a limiting frame is fixedly mounted at the top of the placement plate. According to the grounding current limiting device, the L-shaped plate moves downwards to drive the limiting plate to move downwards, the limiting plate moves downwards to make contact with the grounding connecting wire and extrude and fix the grounding connecting wire, the optimal state of the grounding connecting wire can be kept by avoiding bending or pulling, low grounding resistance is ensured, and therefore the efficiency and safety of the grounding current limiting device are improved.

The application discloses a kind of nuclear power plant deep burying ground connection slender ground electrode installation construction methods, comprising the following steps: temporarily fixed support is fixedly installed on the outer wall of nuclear power plant workshop;Reinforced anchor rod is installed in the backfill layer below the lower end of ground electrode;The body of ground electrode is tied and fixed on temporarily fixed support, and the lower end of ground electrode is tied and fixed on reinforced anchor rod;Ground electrode is accepted for concealed works;From the lower end of ground electrode, backfill is carried out layer by layer upwards, the connection of temporarily fixed support and ground electrode is released layer by layer, and temporarily fixed support at the place is removed;After the height of backfill layer rises to the top end of ground electrode, lightning protection grounding well is installed at the top of ground electrode;Continue backfill until the height of backfill layer and the well lid of lightning protection grounding well are flush.The application solves the problems of complex process, large workload of traditional ground electrode installation construction method, and the problem that ground resistance increases due to the fact that ground electrode and backfill layer are not in close contact, which affects the grounding effect.

The utility model provides a PTC (Positive Temperature Coefficient) heater with a grounding device on a tube body, which comprises a tube body, one or more sheet-shaped PTC heating elements are arranged in the tube body, an upper electrode plate and a lower electrode plate are arranged on the upper plane and the lower plane of each PTC heating element, the outer sides of the upper electrode plate and the lower electrode plate are wrapped by an insulating layer to form a PTC heating core, and the grounding device is arranged on the tube body. And a grounding device is arranged on the outer side surface of the pipe body. Compared with the prior art, the grounding device has the beneficial effects that the grounding screw is directly fixed on the pipe body, the grounding resistance is small, the grounding screw and the sawtooth annular terminal are used for grounding, the loosening problem of the grounding device is prevented, and the grounding reliability of the product is effectively ensured.

The present invention relates to the field of cable technology, and in particular to a low-voltage multi-core mineral insulated cable, comprising a plurality of main cable units, a ground wire unit and an optical fiber unit, wherein the main cable units are arranged around the left and right sides of the optical fiber unit, a first mineral insulation layer is extruded between and around the main cable unit and the optical fiber unit, a second mineral insulation layer is extruded around the first mineral insulation layer, the ground wire unit is coated between the first mineral insulation layer and the second mineral insulation layer, a sheath layer is coated around the second mineral insulation layer, and an outer protective layer is arranged on the outside of the sheath layer. The cable as a whole can be matched and applied to complex and harsh working conditions, and can realize the characteristic of easy bending in one direction during use, and has a large bending radius in other directions, which effectively reduces cable damage caused by random and excessive twisting during cable laying and prolongs its service life.

The utility model provides a portable ground detecting instrument, which belongs to the technical field of meteorological equipment, and comprises a base, a fixed ground anchor, a ground sensor, a wireless communication module and a power supply module, the structural frame is fixedly arranged on the base, the structural frame comprises beam rods which are annularly distributed, and threads are arranged on the beam rods; the lifting platform is arranged on the structural frame in a sleeving manner; the driving motor is installed on the lifting platform, the outer side of the driving end of the driving motor is sleeved with a threaded ring, and the threaded ring is connected with the beam rod in a threaded fit mode; the clamping ring comprises a butt joint piece connected with the driving motor and a first butt joint port connected with the butt joint piece; the sampling pipe comprises a first pipe body, a drill bit arranged at the lower end of the first pipe body and a second butt joint port arranged at the upper end of the first pipe body. The requirement for water content detection during surface soil layer sampling can be met.

The present invention relates to the technical field of grounding protection devices for power grids, and discloses a grounding protection device for smart grids, including a telescopic bracket, two limit assemblies and a conductive bar, wherein the telescopic bracket has two telescopic ends that can move closer to or farther from each other; two limit assemblies are respectively arranged at the two telescopic ends, and the limit assembly includes two limit brackets, which are respectively arranged on both sides of the telescopic bracket and can be rotatably connected to the telescopic bracket. When the limit bracket is rotated to be perpendicular to the telescopic bracket, a limit structure is formed between the limit bracket and the telescopic bracket; the conductive bar is detachably connected to the telescopic bracket; wherein the telescopic bracket, the limit bracket and the conductive bar are all conductive and electrically connected to each other. The telescopic bracket and the limit bracket can be unfolded and folded, and there is no need to fix each component by welding. The telescopic bracket and the limit bracket extending in different directions increase the length of the grounding, which can effectively reduce the grounding resistance.

The embodiment of the application discloses a power transmission line tower grounding device and a design method and system thereof, which measures the soil resistivity around the power transmission line tower to determine the grounding resistance limit value of the tower, then determines the side length of the horizontal square frame electrode according to the structural parameters of the tower and the distance between the tower and the horizontal square frame electrode, and finally determines the total length of the horizontal radiation electrode and the number of vertical electrodes according to the side length of the horizontal square frame electrode, the grounding resistance limit value and the soil resistivity, so as to finally determine the structure of the grounding device. According to the design method and system, the length and depth of the horizontal square frame electrode of the power transmission line tower grounding device and the depth of the vertical electrode are not particularly large, and can be constructed by general machinery, so that the cost is effectively reduced, and the grounding resistance of the tower is effectively reduced under the condition of smaller occupied area, so that the back flashover rate of the line is reduced, and the safety performance around the tower is improved.

This invention provides a lightning protection device for medium-wave transmitters, belonging to the technical field of medium-wave transmitters. It includes a cabinet structure with a vertically mounted grounding mechanism on the bottom surface. A lightning rod is installed at the top of the support, serving as the first line of lightning protection. A complete intelligent grounding system is constructed, with humidity detectors evenly distributed at multiple depths in the soil layer to monitor humidity changes at different depths in real time. When a decrease in soil moisture and an increase in grounding resistance are detected, maintenance personnel can inject water into the water storage box through the water injection pipe. The water seeps evenly into the soil layer through the injection holes, effectively reducing the grounding resistance and ensuring excellent lightning protection grounding performance even in dry seasons or arid regions. Multiple grounding rods are arranged in parallel, increasing the contact area with the soil and further improving the discharge capacity. This design fundamentally solves the technical problems of traditional grounding devices being greatly affected by soil moisture and having unstable grounding effects.

The utility model provides a kind of power collection line iron tower modularization grounding device, belong to electric power equipment technical field, the power collection line iron tower modularization grounding device includes: grounding body, connecting component, fixed module, conducting ring and adjusting mechanism;The grounding body is cylindrical structure, the top of grounding body is equipped with connecting face, connecting face is equipped with threaded hole, bolt is threadedly connected in threaded hole;The connecting component includes connecting plate, connecting rod and locking sleeve, connecting plate is fixedly arranged on the connecting face of grounding body, the middle part of connecting plate is equipped with through-hole, connecting rod is arranged in through-hole, the upper end of connecting rod is threadedly connected with locking sleeve;The fixed module includes fixed seat and clamping piece, the utility model can solve the technical problems that the existing power collection line iron tower grounding device structure is complex, installation and maintenance are difficult, modularization degree is low, and adaptability is poor.

The utility model discloses a tower lightning protection grounding device which comprises a connecting block, a grounding rod is fixedly installed on the outer surface of the lower end of the connecting block, a spiral metal conductor is fixedly installed on the outer wall of the grounding rod, a mounting hole is formed in the upper portion of the outer surface of one side of the connecting block, and a grounding down lead penetrates through the mounting hole. A limiting assembly is mounted in the connecting block and comprises a second limiting hole, a third limiting hole, a mounting cavity, a compression spring, a limiting block and a limiting pin. According to the lightning protection grounding device for the tower, the grounding downlead and the connecting block are limited through the limiting assembly, the stability after connection is improved, assembly and disassembly are facilitated, the contact area between the grounding body and soil is increased through the grounding rod, the spiral metal conductor and the spiral structure, and the grounding body is prevented from being damaged. And grounding resistance is reduced.

The present invention relates to a portable quick grounding device, comprising an electric hammer, a grounding rod and a lap cap, wherein the grounding rod comprises a grounding rod body and a grounding rod head and a grounding rod handle respectively arranged at two ends of the grounding rod body, wherein the grounding rod body is provided with a spiral texture, and in the grounding and withdrawal operation state, the grounding rod handle is arranged in the hammer head mounting hole of the electric hammer, and in the grounding state, the lap cap is installed on the grounding rod handle, and the lap cap is provided with a positioning mechanism for stabilizing the grounding rod handle and an auxiliary mechanism for withdrawing the grounding rod from the ground. Compared with the prior art, the present invention has the advantages of quick grounding, reusable components, and convenient carrying.

The utility model discloses a device for high -voltage electrical equipment insulation detection test relates to insulation detection device technical field, including the protection box, the cavity of protection box fixedly connected with U type support board between two ends, the top one end of U type support board is fixedly connected with signal receiver, the top other end of U type support board is fixedly connected with pulse generator, the cavity bottom one end of protection box is fixedly connected with power module. The protection box provided by the utility model is convenient for the detection operation of the detected device quickly on the basis of realizing shielding electromagnetic and preventing interference influence detection accuracy, thereby solve the problem that the detection accuracy of the existing high -voltage electrical equipment insulation detection test device is interfered because of lacking electromagnetic shielding protection structure, and because of the detection process is complicated, it is difficult to realize quick detection, influence power system operation efficiency.

The invention discloses a wind turbine generator grounding system resistance reduction design method, which comprises the following steps: firstly determining a grounding resistance target value, then designing a wind turbine generator grounding system according to the target value, and the system comprises a fan main grounding grid, a resistance reduction grounding grid and a grounding wire connected with the resistance reduction grounding grid. During design, other surrounding grounding systems should be taken into consideration to form a large-scale grounding grid. In addition, a connecting ground wire of the main grounding grid and the resistance-reducing grounding grid needs to be buried and laid, the shape of the resistance-reducing grounding grid is designed according to the terrain, the landform and the soil structure, and the grounding resistance value is lower than that of the main grounding grid. In order to further reduce the grounding resistance, a mixture of a resistance reducing agent and conductive cement can be paved at the bottom of the horizontal grounding body. The grounding grid is preferably arranged in a place with small soil resistivity and large grounding grid area. The design method improves the stability and safety of the grounding system of the wind turbine generator.