36results about How to "Reduce lightning trip rate" patented technology

The invention relates to a lightning protection device for electric equipment, in particular to a gas arc extinguishing device for electric equipment of various voltage levels. The gas arc extinguishing device for electric power equipment includes a grounding gap, a high voltage gap, a lightning signal detector, a signal transmission circuit, an arc extinguishing gas pill shell, an arc extinguishing gas pill and other components. The arc extinguishing gas pill and the arc extinguishing gas pill shell are installed near the high voltage gap or the ground gap. The lightning signal detector generates a trigger signal after the lightning current passes, and transmits the trigger signal to the arc extinguishing gas pill through the signal transmission circuit and the metal electrode sheet of the arc extinguishing gas pill, and the arc extinguishing gas pill generates an air flow sufficient to blow out the arc. The number of arc extinguishing gas pills determines the number of actions of the gas arc extinguishing device. The invention can quickly extinguish the electric arc, improve the success rate of reclosing, and is beneficial to improve the reliability of lightning protection of electric equipment.

The invention discloses a dynamic monitoring method for the lightning resistance level of a power transmission line tower. The method uses sensors to obtain parameters related to the lightning resistance level of the tower, and transmits the relevant parameters to the monitoring center through wired or wireless communication means. The monitoring center calculates the The real-time lightning resistance level of the transmission line is dynamically monitored and early-warned.

The invention discloses a lightening arrester of a transmission line, comprising a lightening wire main body, a lightening wire jumper, an insulating stay wire and gap impedance, wherein the insulating stay wire is fixed below a tower top through a suspension clamp at the tower top; the tower top is longitudinally connected with an insulating strut; the insulating strut fixes one end of the lightening wire jumper through a metal fixed plate transversely connected with the top end of the insulating strut; the other end of the lightening wire jumper and the lightening wire main body are connected and fixed with the insulating stay wire through strain clamps at the two ends of the insulating stay wire; an air gap is formed between the lightening wire jumper and the tower top; and the air gap is internally provided with the gap impedance. In the lightening arrester of the transmission line of the invention, the gap impedance is utilized to lower the counterattack trip-out rate of the transmission line, thus lowering the lightening stroke trip-out rate of the transmission line with the voltage grade of 110kV or more. The lightening arrester of the transmission line of the invention is simple and practicable, low in cost, convenient to promote and can be applied in all the transmission lines adopting double lightening wires.

The invention discloses a 35kV power transmission line comprehensive lightning protection method, and relates to the technical field of power transmission line lightning protection. The method comprises the following steps: firstly, based on a lightning ground flashover density reference index value of 0.78 times / (km < 2 >. a), by combining line terrain and historical operation data , dividing thelightning stroke risks of the stepped towers into four levels, namely a light thunder area, a medium thunder area, a multi-thunder area and a strong thunder area, wherein four different levels sequentially correspond to a level prevention scheme, a level prevention scheme, a level prevention scheme and different lightning protection schemes of the level prevention scheme, and after the 35kV powertransmission line is rectified, the lightning trip-out rate is reduced by about 70%, the operation and maintenance amount of the line is greatly reduced, and the power supply reliability is improved.According to the scheme, terrain, historical operation and lightning density are comprehensively considered, the analysis method is simple, practical and scientific, and a scientific reference basisis provided for 35kV power transmission line lightning protection implementation and lightning damage treatment.

This invention adopts neutral isolation function mode as the electric net in function: when the circuit is mono-directionally grounded, through the collection of the voltage and current signals of the electric net, judge the failure of the mono-directionally grounding as the metal permanent failure to output the information hinting to process the grounded failure, as to the electric arc failure, uses automatic delivering device to deliver arc-distinguishing coil to eliminate the mono-directional grounded failure, when the grounded failure is wiped off, exit the arc-distinguishing coil and resume the neutral isolation mode of the working order of the electric net. This invention can fully exert the mono-directional grounding capacity of the arc-distinguishing coil, in order to reduce the valve slipping rate of lighting strike and decrease the power off accidents. This invention is suitable for 35kV electrical net neutral point operation in mountainous area.

The invention relates to a line flashover protector comprising a discharge ring, a composite insulator, a discharge probe, an equipotential fitting, a flashover protector body and a cross arm. The upper end of the flashover protector body is vertically suspended on the cross arm. The equipotential fitting is connected with the flashover protector body. The composite insulator is arranged on the equipotential fitting. The composite insulator realizes isolation from a high voltage lead in operation of the flashover protector body, and the discharge probe and the discharge ring are arranged on the composite insulator and the gap between the discharge probe and the discharge ring is adjustable. The advantages of the line flashover protector are that isolation from the high voltage lead in operation of the flashover protector body can be realized through the composite insulator so that leakage current is ensured not to flow through the flashover protector body in normal operation and the service life of the flashover protector body can be enhanced; and the the discharge probe and the discharge ring are arranged so that the line-to-ground fault is not generated even the flashover protector body is damaged and thus normal operation of the line can be guaranteed.

The invention discloses a method for evaluating the influence of DC magnetic bias on a grounding grid of an electricity system. The method comprises the following steps: determining a grounding electrode, a power transmission line and pole towers, acquiring the parameters of the power transmission line in a circle and the parameters of the pole towers in the power transmission line, simulating in an electromagnetic field-circuit coupling manner according to the parameters and the information of the grounding electrode in combination with a moment method and a finite element method, obtaining the current value of each pole tower on a down lead, and then determining whether the current value exceeds the standard or not through judging whether the current value exceeds a standard electrochemical corrosion current threshold or not. The method for evaluating the influence of the DC magnetic bias on the grounding grid of the electricity system, provided by the invention, is simple in calculation, high in accuracy and efficiency and feasible. The method improves the reliability of the grounding system, reduces the lightning trip-out rate of the electricity system and improves the running stability of the whole electricity system.

The invention relates to a differential lightning-proof reconstruction method of a 35kV power transmission line, belongs to the technical field of lightning protection for power facilities and solves the technical problems by providing the reconstruction method of the 35kV power transmission line, whereby lightning damage is effectively avoided for the power transmission line. According to the technical scheme, the method includes the steps of collecting the pole type, insulation configuration, topographic conditions and historical lightning fault information of existing 35kV power transmission line pole / tower equipment, and subjecting the pole / tower equipment, not satisfactory to lightning protection, to data statistics; subjecting a power transmission line pole / tower ground network, not satisfactory to lightning protection, to reconstruction and to differential insulation reconstruction, and mounting lighting arrestors; recording the state of the reconstructed 35kV power transmission line pole / tower equipment in a power production management system, and combining the state with GIS (geographic information system) information to form a GIS map of the power transmission line pole / tower equipment. The method is suitable for power systems.

The invention discloses a vacuum lightning protection gap device based on a hollow cathode effect, comprising a vacuum gap unit and a voltage division loop unit. The vacuum gap unit is of a three-electrode structure, wherein the anode and the cathode of a main gap are of a cavity structure with a hole in the center, a pre-ionization electrode is of a needle structure, and the pre-ionization electrode is arranged inside the cathode and forms a pre-ionization gap with the cathode. The voltage division loop unit is composed of a resistor and a capacitor which are connected in parallel between the main gap and the pre-ionization electrode. Compared with the existing air jet arcing lightning protection gap technology, the advantages of the device are that power-frequency follow current can be cut off in a timely and reliable manner, the device can be reused and has a long service life, and the device is convenient to produce and low in cost of maintenance. Moreover, the device is externally provided with external insulation protection, and can work safely and reliably.

A large-tonnage multi-channel optical fiber composite insulator is characterized in that two end of a core rod are respectively crimped with two connection fittings, and that two connection fittings have the same structure and are oppositely installed; The connecting fitting is of hollow structure, one end of the connecting fitting is crimped with the core rod, and the other end of the connectingfitting is screwed with the outer fitting cavity. An epoxy cylinder is arranged on one end of the connecting fitting and the mandrel and on the outer sleeve of the wound silicone rubber belt. An umbrella skirt is arrange on that outer surface of the epoxy barrel, and an optical fib channel hole is provided on the connecting fitting, the optical fib channel hole is communicated with a gap between the connecting fitting and the epoxy barrel, and is communicated with an external fitting, and is communicated with an optical fiber channel hole of another oppositely installed connecting fitting through a gap between the connecting fitting and the epoxy barrel. The large-tonnage multi-channel optical fiber composite insulator adopts two kinds of connection of the core rod and the epoxy cylinder to form the double insulation and can improve the performance of the insulator. A plurality of optical fibers are implanted into the gap between the core rod and the fitting, so that the number of lightning flashover can be recorded, and the data can be transmitted to a designated position through the optical fibers.

A full-coverage-type lightning protection device for overhead transmission lines comprises three lightning conductors which are arranged above the transmission lines and are parallel to the transmission lines. The middle lightning conductor is located over the middle transmission line, and the left lightning conductor and the right lightning conductor are symmetrically arranged in a left-right mode, wherein the protection angle alpha between the left lightning conductor and the left transmission line is 0 degree. The lightning protection for the three-phase transmission lines by the full-coverage-type lightning protection device is free of dead corners and more comprehensive. Besides, the full-coverage-type lightning protection device has the advantages of being low in improvement cost, convenient to construct and more reliable in lightning protection.

The embodiment of the invention relates to a power transmission line without a lightning conductor. The lightning and ice prevention performance of the power transmission line is enhanced by cancelling the lightning conductor easy to ice and additionally arranging a high-capacity lightning and ice flashover prevention composite insulator. The lightning-conductor-free power transmission line comprises a lightning-protection and anti-icing insulator, a tower, a wire and a communication medium, the through-current capability of the lightning-protection and anti-icing insulator is higher than thatof a traditional lightning arrester, and lightning current can be conducted to the tower while the lightning-protection and anti-icing insulator is used for hanging the wire; and the tower adopts a natural grounding mode and is used for guiding the lightning current into the ground. According to the lightning-conductor-free power transmission line scheme, the problem that a traditional line is prone to ice coating and line breaking of a lightning conductor is solved, the lightning protection and ice prevention performance of the power transmission line is improved, meanwhile, the constructioncost of the power transmission line is reduced, and the economy and reliability of the power transmission line are improved.

The invention discloses a 10 kV / 380 V combined pole distribution line lightning-proof apparatus. A 10 kV / 380 V combined pole distribution line comprises one loop of three-phase 10 kV line above a straight pole and one loop of four-phase 380 V low-voltage line below the straight pole, a line arrester is mounted at any phase of the three-phase 10 kV line, a lightning-proof line support and a lightning-proof line are mounted at the top of a base pole, a ground downlead and a ground part connected to the lightning-proof line support and the line arrester on a cross arm of the 10 kV line are mounted on the base pole. The 10 kV / 380 V combined pole distribution line lightning-proof apparatus has the advantages that modifying cost and operation and maintenance workload are decreased, lightning trip-out rate of the 10 kV / 380 V combined pole distribution line is greatly decreased, and economic benefit is increased.

The invention discloses a vacuum lightning protection gap device based on a hollow cathode effect, comprising a vacuum gap unit and a voltage division loop unit. The vacuum gap unit is of a three-electrode structure, wherein the anode and the cathode of a main gap are of a cavity structure with a hole in the center, a pre-ionization electrode is of a needle structure, and the pre-ionization electrode is arranged inside the cathode and forms a pre-ionization gap with the cathode. The voltage division loop unit is composed of a resistor and a capacitor which are connected in parallel between the main gap and the pre-ionization electrode. Compared with the existing air jet arcing lightning protection gap technology, the advantages of the device are that power-frequency follow current can be cut off in a timely and reliable manner, the device can be reused and has a long service life, and the device is convenient to produce and low in cost of maintenance. Moreover, the device is externally provided with external insulation protection, and can work safely and reliably.

The invention discloses a novel trapezoidal bipolar arc extinguishing insulator, which is mainly composed of an insulator main body, an upper electrode and a lower electrode, wherein the insulator main body is hollow and is provided with a plurality of insulating partition plates so as to form a plurality of independent backflushing perfusion arc extinguishing cavities in the insulator main body,a backflushing device is arranged in each backflushing perfusion arc extinguishing cavity, the backflushing devices are spirally arranged in the insulator main body in a stepped manner, the backflushing openings of every two adjacent backflushing devices are opposite in direction, a wall electrode is arranged on the insulating partition plate between every two adjacent backflushing devices, the top of the lower backflushing device is connected with one face of the wall electrode, and the bottom of the upper backflushing device is connected with the other face of the wall electrode. According to the invention, the problem of flashover of the lightning protection device is effectively prevented, the lightning trip-out rate of power equipment is reduced, power facilities are protected, the reliability of a power grid is improved, and power safety production is facilitated.

The present invention provides an automatic assessment method for lightning damage protection risks of transmission lines, comprising: collecting parameters of typical towers and recording the values ​​of the parameters, the parameters including lightning parameters, tower parameters, topography parameters, line parameters and ground lightning parameters; According to the parameters of typical towers, the counterattack calculation model and the shielding calculation model are established; according to the parameters of the typical towers and the counterattack calculation model, the counterattack tripping rate n1 of the tower is calculated based on the electromagnetic transient calculation program; based on the pilot development model, the calculation of the The shielding tripping rate n1=NgP1η of the pole tower; according to the counterattack tripping rate n1 and the shielding tripping rate n2, calculate the average lightning tripping rate N; according to the average lightning tripping rate N, classify the entire line of poles and towers according to the lightning strike risk. The invention can find out the poles and towers with serious lightning protection situation before the lightning strike fault occurs on the line, and take reforming measures in advance to reduce the lightning strike tripping rate of the transmission line.

The invention relates to a flat plate gap arrester based on superposition of short-arc drop and near-cathode effect, including an insulating mandrel, several flat plate discharge electrodes axially threaded on the insulating mandrel, a fixing seat installed at the low-voltage end of the insulating mandrel, an insert The low-voltage electrode in the fixing seat and the main gap discharge electrode arranged at the high-voltage end of the insulating mandrel, and the silicone rubber vulcanization process used to fix the insulating mandrel, a plurality of the flat discharge electrodes, the fixing seat and The silicone rubber outer sheath of the main gap discharge electrode, wherein, several of the flat plate discharge electrodes are arranged uniformly and in parallel. Zinc oxide-free resistors, green and environmentally friendly, overcome the failure of zinc oxide resistors and the defects of moisture; the arc extinguishing mechanism is composed of three parts: near-cathode effect superposition, near-pole voltage drop superposition, and chamber blowing arc, which can effectively reduce overhead lines due to The arc establishment rate caused by lightning strikes can effectively reduce the line lightning tripping rate under extreme working conditions such as heavy minefields and harsh wet environments.

The invention relates to a lightning protection device for power equipment, in particular to a gas-blast arc extinction lightning protection gap for the power equipment of various voltage classes. The gas-blast arc extinction lightning protection gap for the power equipment comprises parts such as a high-pressure side connecting body, a grounding connecting body, a gas generator, a signal detection unit, a high-voltage electrode, a grounding electrode and the like, wherein the gas generator is arranged nearby the high-voltage electrode or the grounding electrode; the signal detection unit generates a trigger signal after lightning current passes through the signal detection unit; the gas generator is started so as to generate airflow sufficient to blow an electric arc out; in the gas generator, compressed gas is packaged by gas pellets which are packaged by gas bombs; a plurality of gas bombs are sequentially arranged and packaged in the gas generator; and actuated gas bomb frameworks are replaced by unactuated gas bombs automatically, and the action times of the gas generator are determined by the number of the gas bombs. In the lightning protection device, the electric arc can be rapidly blown out, the reclosing success rate is improved and the lightning protection reliability of the power equipment is improved.

The invention discloses a novel trapezoidal arc extinguishing insulator, which is mainly composed of an insulator main body, a low-voltage electrode and a high-voltage electrode, wherein the insulatormain body is hollow, a plurality of insulating partition plates are arranged in the longitudinal direction of the insulator main body to form a plurality of independent backflushing perfusion arc extinguishing cavities in the insulator main body, a backflushing device is arranged in each backflushing perfusion arc extinguishing cavity, the backflushing devices are arranged in the insulator main body in a spiral stepped arrangement manner, a wall electrode is arranged on the insulating partition plate between every two adjacent backflushing devices, the top of the backflushing device located on the lower portion is connected with one face of the wall electrode, and the bottom of the backflushing device located on the upper portion is connected with the other face of the wall electrode, sothat the backflushing devices are sequentially connected together end to end. According to the invention, the novel trapezoidal arc extinguishing insulator can effectively prevent the flashover problem of the lightning protection device, reduces the lightning trip-out rate of power equipment, protects power facilities, improves the reliability of a power grid, and facilitates the safe production of power.

The invention discloses an air-gap-free semi-closed double-backflushing arc extinguishing lightning protection device and application thereof. The arc extinguishing device mainly comprises an arc extinguishing body and a backflushing arc extinguishing assembly, wherein the interior of the arc extinguishing body is of a hollow structure, a partition plate is further longitudinally arranged in the middle of the interior of the arc extinguishing body, and divides the internal space of the arc extinguishing body into two sets of backflushing pouring arc extinguishing channels, a backflushing arc extinguishing assembly is fixedly mounted at the upper end of the backflushing perfusion arc extinguishing channel on the left side, a backflushing nozzle extending towards the side surface of the arcextinguishing body is formed in the lower end of the backflushing perfusion arc extinguishing channel, the upper end of the backflushing perfusion arc extinguishing channel at the right side is a backflushing nozzle extending towards the side surface of the arc extinguishing body, and the lower end is fixedly provided with a backflushing arc extinguishing assembly. The device can restrain and control the arc path, eliminates the harm of arc drift, is wide in application range, is installed at a time, can be repeatedly used for a long time, is low in operation cost, is high in sensitivity, andfacilitates the safe production of electric power.

The invention provides an assembled staggered floor cross arm tangent tower and a tower erection method thereof. The assembled staggered floor cross arm tangent tower comprises a tower body and crossarms perpendicular to the tower body, the tower body comprises an upper vertical tower body and a lower tower body, and the cross arms are distributed on two sides of the tower body in a staggered manner. According to the technical scheme, the tangent tower is suitable for a power transmission line in a mountainous area with the slope gradient below 40 degrees, the shielding failure lightning withstand level of the line is improved, the lightning trip-out rate of the whole line is reduced, design reworking is decreased, tower field assembly difficulty is reduced, and construction efficiency isimproved.

The invention discloses a semi-closed double-jet-airflow arc extinguishing insulator, which comprises an insulator main body, an upper electrode and a lower electrode, wherein the interior of the insulator main body is of a hollow structure, a partition plate is further longitudinally arranged in the middle of the interior of the insulator main body and divides the internal space of the insulatormain body into two sets of airflow jet channels, the upper end of the airflow jet channel on the left side is fixedly provided with an airflow jet assembly, the lower end is an airflow nozzle extending towards the side surface of the insulator main body, the upper end of the airflow jet channel at the right side is an airflow nozzle extending towards the side surface of the insulator main body, and the lower end is fixedly provided with an airflow jet assembly. According to the invention, the semi-closed double-jet-airflow arc extinguishing insulator can restrain and control the arc path, eliminates the harm of arc drift, is wide in application range, is installed once, can be repeatedly used for a long time, is low in operation cost, is high in sensitivity, and facilitates the safe production of electric power.

The invention discloses a semi-closed double-recoil arc extinguishing insulator, which comprises an insulator main body, an upper electrode and a lower electrode, wherein the interior of the insulatormain body is of a hollow structure, a partition plate is longitudinally arranged in the middle of the interior of the insulator main body and divides the internal space of the insulator main body into two sets of recoil perfusion arc extinguishing channels, a recoil arc extinguishing assembly is fixedly mounted at the upper end of the recoil perfusion arc extinguishing channel on the left side, arecoil nozzle extending towards the side surface of the insulator main body is formed in the lower end of the recoil perfusion arc extinguishing channel, the upper end of the recoil perfusion arc extinguishing channel at the right side is a recoil nozzle extending towards the side surface of the insulator main body, and the lower end is fixedly provided with a recoil arc extinguishing assembly. According to the invention, the semi-closed double-recoil arc extinguishing insulator can restrain and control an arc path, eliminates the harm of arc drift, is wide in application range, is installedonce, can be repeatedly used for a long time, is low in operation cost, is high in sensitivity, and facilitates the safe production of electric power.

The invention discloses a method for evaluating the influence of DC bias magnetism on the grounding network of a power system. The information of the pole is simulated through the method of electromagnetic field field circuit coupling, combined with the method of moment and finite element method, and the current value of the down conductor of each tower is obtained, and then determined by judging whether the current value exceeds the standard electrochemical corrosion current threshold Whether the current value reaches the standard, a method for evaluating the influence of DC bias on the power system grounding network provided by the present invention has simple calculation, high accuracy, high efficiency, and is practical, which improves the reliability of the grounding system and reduces the power system. The lightning trip rate improves the stability of the entire power system operation.

The invention discloses a differential lightning protection modification method for 35kV transmission lines, which belongs to the technical field of electric facility lightning protection; the technical problem to be solved is: to provide a 35kV transmission line modification method that can effectively avoid the lightning hazard of transmission lines; the adopted technical scheme is as follows: : A 35kV transmission line differential lightning protection transformation method, comprising the following steps: first, collecting the tower type, insulation configuration, terrain conditions and historical lightning strike fault information of the existing 35kV transmission line tower equipment, and those that do not meet the lightning protection requirements The data statistics of the tower equipment of the transmission line are carried out; secondly, the grounding network of the transmission line tower that does not meet the lightning protection requirements is transformed, the poor insulation is transformed, and the lightning arrester is installed; thirdly, the status of the transformed 35kV transmission line tower equipment is entered into the power production management system, And combined with GIS information to form a GIS map of transmission line tower equipment; suitable for power systems.

The invention discloses a comprehensive lightning protection method for a 35kV transmission line and relates to the technical field of lightning protection for transmission lines. Firstly, based on the lightning flash density reference index value of 0.78 times / (km 2 .a), combined with the line terrain and historical operation data, divide the lightning strike risk of each base tower into four levels: light minefield, medium minefield, multiple minefield and strong minefield. The four different levels correspond to the level of prevention plan, Level-level prevention schemes, level-level prevention schemes, and different lightning protection schemes for level-level prevention schemes. After the rectification of the 35kV transmission line, the lightning trip rate was reduced by about 70%, which greatly reduced the amount of operation and maintenance of the line and improved the reliability of power supply. The above-mentioned scheme comprehensively considers the terrain, historical operation, and lightning density, and the analysis method is simple, practical and scientific, and provides a scientific reference for the implementation of lightning protection and lightning damage control of 35kV transmission lines.

The embodiment of the present invention relates to a transmission line without a lightning protection line. The lightning protection and anti-icing performance of the transmission line is enhanced by canceling the lightning protection line that is easy to be covered with ice and adding a large-capacity lightning protection and anti-icing flash composite insulator. Transmission lines without lightning conductors, including lightning-proof and ice-proof insulators, towers, wires and communication media, among which the current capacity of lightning-proof and ice-proof insulators is higher than that of traditional lightning arresters, which can conduct lightning current to towers while suspending wires; , using the natural grounding method to guide the lightning current into the ground. The non-lightning protection line transmission line solution solves the problem that the traditional line is prone to ice-covered and disconnection of the lightning protection line. While improving the lightning protection and anti-icing performance of the transmission line, it reduces the construction cost of the transmission line and improves the economy and reliability of the transmission line. .

The invention discloses a V-shaped arrangement anti-chain-falling treatment and warning method of composite insulators. A suspension member is installed at the middle part of a V-shaped insulator chain and includes a line lightning arrester and a suspension disc type insulator chain that are connected successively. The upper end of the line lightning arrester is connected to a cross arm by a tension sensor; and the lower end of the suspension disc type insulator chain is connected to a wire side linking plate. A data line of an intelligent host is connected to the tension sensor; and information is sent to a device management department by a communication unit. With the disclosed method, the backup protection of the V-shaped composite insulator chain is realized; the lightning protection level of the line is increased; the chain falling probability is reduced; and the lightning trip-out rate is reduced.