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

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 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 discloses a 35kv/10kv common-tower distribution line lightning protection device. According to the device, the 35kv/10kv common-tower distribution line comprises a primary loop circuit three-phase 35kv line above a straight-line pole tower and a primary loop circuit three-phase 10kv line below the straight-line pole tower, line arresters are installed on any two phases of the three-phase 10kv line, a lightning conductor support and a lightning conductor are installed on the tower top of a base pole tower, a down conductor and a grounding connector are arranged on the base pole tower and are connected with the lightning conductor support and the line arrester on a cross arm of the 10kv line. The 35kv/10kv common-tower distribution line lightning protection device has the advantages of being capable of lowering improvement cost and operation maintenance load, sharply lowering lightning trip-out rate of the 35kv/10kv common-tower distribution line and improving economic benefits.

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.

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 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 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 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.