36 results about "Earthing system" patented technology

The application discloses a method for simulating the parameters of a generator neutral point grounding system of an extended unit connection, which comprises an actual generator system and a simulated generator system in parallel operation, wherein the simulated generator system comprises a low zero sequence impedance transformer, a three-phase capacitor bank and a simulated generator neutral point grounding device; the parameter simulation test comprises the following steps: S1, relay protection configuration; S2, neutral point asymmetric voltage test of the generator neutral point grounding system of the extended unit connection; S3, neutral point displacement voltage test of the generator neutral point grounding system of the extended unit connection; S4, maximum capacitive current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection; and S5, maximum fault current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection. The application can effectively verify the grounding system performance of different grounding modes of the generator of the extended unit connection and determine whether the generator neutral point grounding mode meets the technical requirements.

The application discloses a high-speed railway pantograph-catenary arc electromagnetic radiation interference modeling analysis method, constructs a pantograph-catenary arc-pantograph power supply system integrated model containing a traction substation model, a traction network model, a train traction transmission system model, a train-track return current grounding system model and a pantograph-catenary arc model; under a pantograph-off arc transient condition, arc current is obtained through simulation calculation; and based on the arc current, a relationship between arc radiation power and spatial equivalent electric field intensity is established to represent the influence of time-varying characteristics of traction network electrical parameters on pantograph-catenary arc electromagnetic radiation interference. Under the pantograph-off arc transient condition, the real-time changes of impedance and capacitive reactance parameters of the traction network are involved in the unified solution of arc current formation, radiation power evolution and spatial electric field intensity calculation, and meanwhile, key coupling factors of the train high-voltage system and the train-track grounding system are mainly considered, so that the accuracy and engineering applicability of pantograph-catenary arc electromagnetic radiation interference analysis are improved.

The application provides a kind of giant hydropower plant transformer temporary grounding system and method, belongs to transformer maintenance grounding technical field.System includes transformer, grounding device seat body, grounding device, transmission gear set, rotary locking device, grounding sliding base and state monitoring assembly;Grounding device can overturn switching state, through gear linkage drive grounding locking contact automatic plug-in completes grounding end installation, piston rod automatic extension realizes conductor end butt joint and locking, with mechanical locking and double-point redundant grounding.Installation follows first grounding end, then conductor end, removal first removes conductor end, then removes grounding end specification sequence, cooperate state switch to realize remote real-time monitoring and position identification.The application is easy to operate, without manual contact grounding body, high safety and reliability, can be single set commonly used in multiple transformers, greatly improves the safety management level and operation efficiency of giant hydropower transformer maintenance.

The application discloses a high-voltage alternating-current submarine cable grounding system fault current calculation method and system and a storage medium, and steps are as follows: based on Thevenin equivalent theorem, power supply and power consumption equipment are respectively equivalent to impedance and series voltage source combination and load impedance; combined with double-ended grounding characteristics, the submarine cable loop is equivalent to a π type, and a three-phase equivalent circuit is constructed; the fault phase is determined, and the submarine cable is divided into left and right sides at the fault point; based on Kirchhoff's theorem, voltage loop equations are written, and matrix recursive rules are derived combined with double-side elimination principle. The analytical relationship between the power supply side, the short-circuit side submarine cable main section and the fault circulating current is established according to the recursive rules. The fault point current equation is taken as a boundary condition, and the left side sheath fault circulating current distribution is solved. The right side distribution is obtained by repeating the above steps on the right side, and then the whole line distribution of the fault phase is obtained. The method can accurately calculate the circulating current distribution, improve the fault analysis accuracy and efficiency, and provide support for submarine cable operation and maintenance.

The application discloses a kind of small resistance grounding system grounding fault detection method and device in the technical field of power distribution network, method includes: using sensor to collect the zero sequence current I0 and zero sequence voltage U0 of line;When the zero sequence voltage U0 of line U set , the waveform comparison coefficient K of zero sequence voltage U0 and zero sequence current I0 is calculated r , that is, the ratio of the point number of the sign opposite of zero sequence voltage U0 left shift quarter cycle and zero sequence current I0 sampling value with the sampling point number N of each power frequency cycle;When the zero sequence voltage U0 of line U set , line is normal line;The size of K r With protection starting value K set , when K r >K set , it is judged as grounding fault line, and sends out fault signal after the set delay value t set ;When K r ≤K set , line is normal line.The method is simple and easy to operate, improves the sensitivity of small resistance grounding system grounding fault detection, reduces the time consumption of judgment, improves efficiency.

This utility model discloses a metal casing for electromagnetic shielding, including an upper casing, a lower casing, and a grounding wire. The upper and lower casings have spaces for placing electronic products. The lower casing is connected to the grounding wire, which is used to connect to a grounding system. The upper and lower casings are detachably connected. A plug-in ring is provided at one end of the upper casing facing the lower casing, and the lower casing has a wall groove adapted to the plug-in ring. Conductive rubber is provided between the upper and lower casings. By providing conductive rubber at the joints of the metal casing, the impedance of the electrostatic discharge path is significantly reduced, effectively solving the high impedance problem caused by holes and gaps in traditional casings, preventing the enhancement of the electric field caused by charge accumulation. The conductive rubber not only provides excellent conductivity but also enhances the sealing of the casing, preventing moisture and dust intrusion.

This utility model discloses a fault location device for grounding systems, comprising: a support, a detection mechanism, and a conveying mechanism, wherein the detection mechanism and the conveying mechanism are respectively mounted on the support; the conveying mechanism includes: a first roller rotatably connected to the support; a second roller rotatably connected to the support and spaced apart from the first roller, the distance between the second roller and the first roller being adjustable; and a drive assembly mounted on the support and connected to the first roller and / or the second roller. Without the clamping of the second roller and the first roller, the operator pulls the cable back and forth with less effort, thereby reducing labor intensity, minimizing wear and damage to the cable during detection, ensuring cable integrity, and thus improving cable lifespan.

The tape spreader type has an adjustable automatic electric soiling system, designed in the field of agricultural machinery and mechanized drip irrigation equipment. The use of drip irrigation tapes requires precise and uniform installation of the tape in the fields, which is faced with difficulties such as fixing the tape on the soil surface and adjusting the depth of the tape placement. This device, with four parallel spreading units, performs tape spreading operations in two surface methods along with automatic sectional soiling and subsurface with the ability to adjust the depth. The electric earthmoving system, with automatic and adjustable operation, is managed through a central control panel and provides settings such as the distance between earthmoving sections, earthmoving length, and the penetration depth of the earthmoving machines electronically. The machine is equipped with a suspension system to maintain a uniform height of the spreading units relative to the crop bed and has the ability to create regular furrows with adjustable furrowing furrows, which is applicable to all types of crops and non-sloping lands, including manual cultivation conditions, and the possibility of furrowing and spreading the strip simultaneously is provided. This machine is mainly designed for implementing drip irrigation strips in corn, wheat, barley, rapeseed, onion and other crop fields.

This invention discloses a medium-voltage fire-resistant stranded conductor, a power cable, and its forming method, relating to the field of power facility technology. The cable includes, from the inside out, a conductor, an extruded semi-conductive conductor shielding layer, a cross-linked polyethylene insulation layer, an extruded semi-conductive insulation shielding layer, a wrapped semi-conductive tape, and a metal shielding layer. The extruded semi-conductive conductor shielding layer and the insulation shielding layer eliminate air gaps between the conductor surface burrs and the insulation layer interface, achieving uniform electric field distribution and preventing partial discharge. The wrapped semi-conductive tape not only acts as a filling and buffering "cushion," preventing the metal shielding layer from puncturing or damaging the internal XLPE insulation layer during bending or thermal expansion, but also ensures electrical continuity between the insulation shielding layer and the metal shielding layer through its semi-conductive properties. This reliably guides fault current or induced voltage into the grounding system, significantly improving the safety margin and lifespan of the cable under long-term operation and overvoltage conditions.

The present application relates to the technical field of current transformer, and discloses an anti-interference current transformer with sectional shielding winding of secondary winding, which comprises a closed composite core, a primary winding, a sectional secondary winding assembly, a sectional shielding mechanism and an adaptive current equalization shielding unit. The present application is systematically and cooperatively optimized from four dimensions of magnetic circuit, winding, shielding and grounding. Wide-band magnetic flux conversion and anti-saturation are realized through the radial layered composite core. The winding parameter consistency problem is solved through the sectional winding of the secondary winding and the independent insulation framework. The adjacent winding cross interference is blocked and the parasitic loss is reduced through the sectional Faraday cage shielding. The current unevenness and stray magnetic field are suppressed from the primary side source through the adaptive current equalization shielding unit. Finally, a unified discharge channel is provided for all interference currents through the single-point grounding system, so as to comprehensively improve the measurement accuracy and operation stability of the current transformer in the strong electromagnetic interference environment.

The application discloses a fault model training method, a fault positioning method, a device and equipment; the fault model training method comprises the following steps: obtaining a target training sample set; wherein, the target training sample in the target training sample set comprises three-phase voltage signals and three-phase current signals of a feeder in a power distribution network; the target training sample set is associated with label information, and the label information is first type label information or second type label information; the first type label information is used for representing that the power distribution network does not occur a fault; the second type label information is used for representing a feeder and a phase corresponding to the fault; the target training sample set is input into a preset fault classification model, a loss value is determined according to the output of the preset fault classification model; wherein, the preset fault classification model is constructed based on a neural network model; and the preset fault classification model is trained based on the loss value. The preset fault classification model trained by the application can efficiently and accurately identify a single-phase grounding fault of a small current grounding system and locate a fault phase of a feeder in a power distribution network.

The application discloses a method and system for quickly and batch verifying correctness of phases of a neutral point ungrounded system power grid, and utilizes voltage characteristics (one-phase reduction Delta U1 and two-phase increase Delta U2) of single-phase grounding fault of the neutral point ungrounded system to automatically trigger verification; a "reference bus voltage library" is constructed, and verified double power sources or superior power supply stations are automatically matched as reference references; a zero sequence voltage amplitude checking mechanism is innovatively introduced, on the basis of preliminary determination of phase consistency, further checking amplitude differences of each phase voltage and zero sequence voltage of the to-be-verified station and the reference station is performed; if the differences are all within a preset threshold Delta U, data is automatically included in the reference library to realize dynamic updating; if any difference is out of limit, an artificial closed-loop processing flow is triggered, and manual checking and correction are forced to be performed before the data can be stored in the library. Through the cooperative mechanism of "fault triggering + zero sequence checking + man-machine closed loop", the application realizes automation, high reliability and continuous self-evolution of reference data of the phase verification of the power grid.

The utility model relates to pipeline engineering technical field, concretely is a kind of anti-static RTP pipe, including pipe body, the pipe body includes outer layer reinforcing layer, intermediate thermoplastic plastic layer and inner layer conductive coating, the inner layer conductive coating is evenly coated on the inner wall of intermediate layer, the conductive coating is made of carbon nanometer material and polymer matrix composite, the outer layer reinforcing layer adopts glass fiber braided structure.The metal wire net of outer layer in the device is used as electrostatic conduction channel, further guides electrostatic to grounding system, to avoid the generation of electrostatic spark, in addition, clamp connection uses conductive elastic material, ensures the conductive continuity of entire pipeline system, improves the overall anti-static reliability, the outer coating ultraviolet-resistant polyurethane protective layer can effectively resist ultraviolet aging in long-term outdoor use, further delays material aging process, pipeline has higher pressure resistance, corrosion resistance, anti-aging and sealing performance.

The application discloses a pantograph-catenary arc electrical characteristic and transient overvoltage analysis method considering the influence of time-varying parameters, in which, in the transient analysis of pantograph-catenary off-line arc, time-varying impedance and capacitive impedance parameters of a traction network are introduced into the pantograph-catenary arc electrical characteristic formation process for the first time, and an improved arc model considering the influence of train speed and a fine train-track grounding system model are combined to realize the unified analysis of the overvoltage of a train roof and a train body, avoid the overvoltage evaluation deviation caused by the static traction network parameters and the simplified grounding model, and improve the accuracy and engineering applicability of the pantograph-catenary off-line arc transient overvoltage analysis.

The application provides an arc high-resistance fault line selection method for an active small-resistance grounding system. Zero sequence currents of first ends of each feeder after fault occurrence are collected; fundamental wave, third harmonic and fifth harmonic in the zero sequence currents are extracted by using empirical wavelet decomposition; third harmonic and fifth harmonic energy of each feeder within a quarter of a cycle after the fault is calculated, and E i The three groups of harmonic energy with the largest amplitude and corresponding feeders g, m and k are selected; based on the fundamental wave, third harmonic and fifth harmonic extracted from the feeders g, m and k, a harmonic matrix H g , H m , H k is constructed; if SSIM(H g , H m ) < SSIM(H m , H k ) and SSIM(H g , H k ) < SSIM(H m , H k ), the feeder g is the fault feeder, and the others are healthy feeders, otherwise, step 1 is returned to re-collect. The application significantly improves the sensitivity and accuracy of the line selection method.

The utility model provides a high frequency lightning protection grounding system can be used outdoors, including discharge sphere system, lightning protection bleed coil system and seal cover, discharge sphere system includes two sets of discharge umbrella, a set of discharge umbrella connects tower mast and is insulated with ground insulation, another set of discharge umbrella is connected with ground, discharge sphere system bottom is equipped with lightning protection bleed coil system, discharge sphere system and lightning protection bleed coil system are connected in parallel, keep a certain distance between two sets of discharge umbrella and form discharge gap, the utility model discloses utilize the discharge gap between two sets of discharge umbrella to guarantee when tower mast is struck by lightning can discharge smoothly and does not affect the normal electrical performance of tower mast, lightning protection bleed coil system is also bleed circuit when being struck by lightning, can also discharge static electricity to ground, guarantees the lightning protection effect of system whole, discharge sphere system and lightning protection bleed coil system can be installed and set up under the protection of seal cover outdoors, guarantees its safe and reliable operation in various complex outdoor environment.

A grounding system for a solar power generation facility includes a number of conductive mounting assemblies and a tension member in the form of a cable. A cable coupling of each of the conductive mounting assemblies is structured to engage and clamp the cable. The cable and each of the cable couplings has a conductivity level that is greater than a conductivity level of steel or galvanized steel, and the cable alone and respective combinations of the cable and each one of the cable couplings are each structured to provide at least a portion of a respective grounded current path of the grounding system that will be coupled to current wires and cable hangers that are supported by the cable.

This invention discloses a grounding system for suppressing transient electromagnetic interference from laser target firing, belonging to the field of electromagnetic compatibility grounding technology. It aims to solve the problem of efficient discharge of broadband, high-intensity electromagnetic pulses generated by high-pulse laser target firing. The system includes an inner equipotential ring, an outer annular grounding surface, symmetrical connection components, and an external grounding network. The inner equipotential ring is located inside the target cavity and is electrically connected to the cavity wall through multiple overlapping points to equalize the transient potential within the cavity. The outer annular grounding surface surrounds the target cavity and is electrically connected to the inner equipotential ring through at least four symmetrically distributed conductive connectors. The outer annular grounding surface is connected to multiple points of vertically arranged grounding electrodes in a ring array via multiple connecting flat steel bars to achieve electromagnetic pulse current discharge. This invention can effectively suppress ground potential rise and secondary electromagnetic interference, improving the operational stability and measurement accuracy of high-pulse laser devices.

The application discloses a kind of monitoring method and system of electric power grounding system, applied to resistance detection technical field, method includes: obtaining the position distribution information of each ground body in target electric power grounding system;Based on position distribution information, the mutual impedance information of each ground body is obtained;Determine the target excitation frequency point of ground body;The target excitation signal is applied to corresponding ground body, and corresponding response signal is obtained;Orthogonal demodulation is carried out to the target impedance component extracted from response signal, and resistance response component and reactance response component are obtained;According to resistance response component, the equivalent resistance value of ground body is obtained, and the impedance data of ground body is determined based on reactance response component to process equivalent resistance value;Based on the impedance data of ground body, the resistance monitoring data of target electric power grounding system is obtained.The monitoring method and system of electric power grounding system provided by the application effectively improve the accuracy of resistance monitoring of the electric power grounding system of multiple ground body.

The application discloses a mobile contact net intelligent grounding system, which is used for grounding the contact net based on the control of an operator and comprises a first grounding device, wherein the grounding device comprises a grounding switch, an observation window, a control chamber and an interface chamber. The interface chamber is provided with a grounding end and an input end, the grounding end is connected with the ground through a ground wire and is connected with the input end, the input end is further connected with one end of the grounding switch, the other end of the grounding switch is connected with the contact net through a connecting wire, and the grounding switch is closed or opened after receiving a control signal sent by the operator, so that the contact net is conducted or cut off with the grounding end; the control chamber is provided with a plurality of control modules and is used for controlling the conduction or cut-off of the grounding switch; and a plurality of display components are arranged behind the observation window and are used for displaying working parameters of the first grounding device. Through the system, the operator can realize the grounding of the contact net without manual wiring, the workload of the operator is reduced, and the working efficiency is improved.

A potted plant grounding system that employs conductive wire and grounding rods to establish a stable electrical ground for indoor plants is disclosed. The system is intended for environments where traditional grounding is inaccessible such as in a potted plant using a non-conductive container, the system uses a conductive wire attached to a metal rod embedded in the plant's soil, connecting to a grounded source, such as an outlet or grounding rod. The rod transfers excess electrical charge from the plant to the ground, maintaining a balanced charge that benefits plant health by simulating natural outdoor grounding conditions. This approach helps reduce electrical stress on indoor plants caused by artificial environments, potentially enhancing plant growth and resilience. This grounding system offers a practical solution for plant care enthusiasts, particularly in urban and indoor settings.

This invention relates to the field of power distribution network fault detection technology, and particularly to a method, system, computer equipment, and medium for selecting high-resistance grounding faults in low-resistance grounding systems. The method includes: acquiring the bus zero-sequence voltage and the zero-sequence current of each feeder to obtain a set of characteristic parameters; identifying the main noise frequency band and determining the target high-frequency detection frequency band; when preset start-up conditions are met, controlling the neutral point-to-ground bypass branch to switch between at least two different impedance levels; constructing a normalized energy response sequence for each feeder to obtain the matched filter output value for each feeder; and identifying the feeder with the largest matched filter output value that meets preset significant conditions as the faulty feeder. This approach solves the technical problem of insufficient fault feature extraction accuracy in environments with strong noise interference, improving the accuracy, anti-interference capability, and adaptability to complex operating environments for selecting high-resistance grounding faults.

This invention discloses an evaluation method for additional grounding devices in high-resistivity wind farm areas considering horizontally layered geology, belonging to the field of lightning protection technology for new energy power systems. It mainly includes a wind turbine foundation grounding ring, a horizontal grounding device for a prefabricated substation, a horizontal ring grounding device for the wind turbine, horizontal grounding flat steel for the wind turbine, vertical grounding electrodes, grounding connection points, orthogonal measuring lines, etc. By constructing a grounding test platform for high-resistivity wind farm areas considering layered geology, and conducting geological resistivity tests at different wind turbine locations and under different measuring lines based on the Wenner four-electrode method, the method obtains the estimation factor of the additional grounding electrode at different wind turbine locations. The test platform constructed by this invention can consider the influence of horizontally layered geology and obtain the estimation factor of the additional grounding electrode for grounding systems at different wind turbine locations, providing an engineering reference for improving the efficiency of grounding design in high-resistivity wind farm areas facing horizontally layered geology.

This invention relates to a method for promoting electrical conductivity between metal parts and composite materials. A composite is coated with an adhesive layer comprising a conductive material, and when the metal parts are attached to the composite, the metal parts are electrically connected to the conductive material of the adhesive layer. The adhesive layer is deposited inside pores in the composite, and / or along the edges of the pores, and / or deposited on a portion of the surface of the composite. The composite is a structure of an aircraft or other vehicle composed of a composite material formed from carbon fiber reinforced polymer (CFRP), the metal parts being fasteners or placed at the interface between the fasteners and the composite, and the electrical connection is fabricated as part of a lightning protection system, an electromagnetic effect (EME) management system, or a grounding system.

The application relates to the field of electric power grounding, in particular to a grounding device for the shaft end of a motor shaft, which comprises oppositely arranged first and second conductive seats, the first conductive seat is used for being connected with the shaft end of the motor shaft, the second conductive seat is used for being connected with an insulating frame on a vehicle body, a plurality of containing frames are fixedly installed on the side of the second conductive seat close to the first conductive seat, a conductive block is slidably arranged in the containing frame, an elastic piece is installed in the containing frame, the elastic piece is used for driving the conductive block to tightly abut against the first conductive seat, a conductive wire is connected between the conductive block and the second conductive seat, and the second conductive seat is electrically connected with a grounding system of the vehicle body. The application has the effect of improving the safety of motor operation.

The present application relates to photovoltaic power generation design technical field, specifically to a kind of distributed photovoltaic power station electrical design drawing fast drawing method, comprising: obtaining the field area geographic information data of target power station, photovoltaic module, inverter, junction box and grid access point etc.Basic design data;Site grading analysis is carried out to field area geographic information data, and elevation data is obtained, and the main equipment material list is obtained by type selection matching to various equipment parameters;Based on elevation data, equipment list and basic data, call preset electrical design knowledge graph to generate design logic tree containing component arrangement, group string connection, inverter configuration and grounding system connection logic;Design logic parameterization mapping generates drawing control parameter set;According to the set, data filling and graphic automatic layout are carried out on the preset drawing template, and initial version electrical design drawing is generated.The method can efficiently complete drawing, solve the problem of low efficiency and unstable quality of traditional design.

The small current grounding system single-phase grounding fault line selection method solves the problem of how to improve the line selection accuracy, and belongs to the field of small current fault line selection. The two power frequency period data before the fault are used as the reference, and the data after the fault are compared by difference, so that the inherent interference such as load imbalance, harmonic background and line parameter asymmetry during normal operation of the system is eliminated, and the fault characteristics are more prominent. Secondly, four criteria (differential steady-state phase, wavelet packet differential energy spectrum, differential instantaneous phase consistency and envelope weighted cumulative polarity) are used to describe the fault from different physical aspects. Each criterion independently outputs a 0~1 confidence level, forming a multi-dimensional complementary verification mechanism. Even if a certain criterion fails under certain conditions, other criteria can still provide reliable evidence. Finally, the prior probability and the four criterion likelihood values corrected by dynamic weight are fused through the Bayes formula to obtain the posterior probability of each branch and bus grounding, and the high and low threshold values are used for hierarchical decision-making.

The application relates to the technical field of safety signs, and discloses an intelligent sensor induction type electric power safety sign, which comprises a support, a warning board is arranged at the top of the support, a control box is arranged at the middle of the support, and a ground monitoring module is arranged on the control box and used for monitoring whether the ground is electrified. The intelligent sensor induction type electric power safety sign can continuously monitor the potential difference or current change between grounding probes. Once the electric power equipment is electrified, the current flows into the ground through the grounding system, the potential difference or current is changed, the electrification detection circuit immediately detects the abnormality and transmits a signal to a control module, the control module judges the electrification condition according to a preset threshold value, rapidly sends an early warning signal to a remote control center through a wireless communication module, and thus the remote staff can acquire the electrification information in the first time, timely measures are taken for treatment, safety accidents caused by electrification are effectively avoided, and the normal operation of the electric power facilities and the safety of personnel life are ensured.