4857 results about "Lightning arrester" patented technology

A method, system, and apparatus for combating ingress influences on network communications. The method, system, and apparatus may be suitable for use in any number of network environments and for identifying, minimizing, or otherwise ameliorating the influence of ingress on network communications.

A structure is disclosed that will quench a flame front during a flashback event in a gas turbine while simultaneously providing a mixing function during normal operations. The device disclosed consists of two monoliths one upstream of the other. In the basic embodiment of the invention the downstream monolith acts as a mixer while the combination of the upstream monolith and the downstream monolith act as the flashback arrestor. Other embodiments of the device also allow the downstream monolith to be a flameholder.

The invention relates to a breaker of a direct current system, in particular to a semi-controlled active injection current high voltage direct current breaker and a realization method thereof. The breaker comprises a high speed switch-thyristor module branch, as well as a lightning arrester branch and a bridge circuit which are connected in parallel with the branch, wherein a capacitor-reactor series branch and a resistor-thyristor series branch are connected in parallel and then connected with middle points of two bridge arms of the bridge circuit; and the two ends of a capacitor are connected in parallel with a charging loop. The breaker is based on a direct current breaking principle by the traditional active injection current manner; semi-controlled power electronic devices are added; a high speed mechanical switch is adopted; the advantage of low loss during normal breakover is kept; and bidirectional current can be broken quickly without an arc. The breaker is simple in circuit topological structure, simple and convenient to control, mature in technology, easy to realize, great in current breaking capability, high in withstand voltage level and strong in expansion capability, and the cost is lowered greatly since the number of the adopted power electronic devices is small.

The invention provides a transformer substation remote monitoring system and method. All indexes of a transformer substation can be monitored online in real time, wherein the indexes include all monitoring data in a transformer, a breaker and an arrester; when a certain index of the transformer substation becomes abnormal, an alarm sound can be sent out in time, failure data and failure devices are displayed on a display screen of a monitoring module, workers are reminded, the data monitoring accuracy and timeliness are improved, and the data transmitting safety and reliability are improved. Meanwhile, the monitoring data of the transformer substation are analyzed and processed in real time at a remote monitoring center, failure reasons and failure sources are found, a maintenance reference scheme is generated, and maintainers of the transformer substation are guided to remove failures in time. In addition, the maintenance records of routing inspection personnel can be recorded, monitored and fed back in time, and the routing inspection personnel are reminded to complete conventional maintenance in time.

An overvoltage protection device for protection of low voltage electrical installations, has a device base part with terminals for phase conductors and ground or neutral conductors and at least one overvoltage protection element, with at least one arrester which is located in a housing. The base part of the device has at least one telecommunications contact which has a switch for remote indication of the state of at least one overvoltage protection element, the base part of the device having plug contacts which are connected to the terminals, and the overvoltage protection element having corresponding connector contacts so that the overvoltage protection element can be plugged onto the base part of the device. The overvoltage protection device is improved by the overvoltage protection element having an optical status display and the optical status display and the switch of the telecommunications contact being actuated via a common mechanical actuating system.

The invention relates to the new features for the earlier applications of toilet system attached a multi-purpose hand held water sprayer affording personal and environmental hygiene. The sprayer that delivers tempered water includes the lock elements on the components to secure connection, various types of spray tip cap for the use of general and medical purposes, an injection apparatus to supply external fluid, a fortified flexible hose, a water hammer arrester or air chamber to reduce water pressure shock, a water heater, a valve to control water flow, a mixing valve, check valves for the mixing valve to stop in reverse flow, a water pressure regulator with a pressure meter, a return line with a check valve for guarding against hot water spike, a thermometer at the outlet, a holder for placement of the sprayer, and various types of valves and sources for the hot and cold water supply. The new features also include the fortified flexible hose having the rollup attachment of middle layers over the flange for reinforcement.

In accordance with the present invention, a method is provided whereby the transient voltages presented at the input to a watt-hour meter are suppressed to prevent damage to the watt-hour meter and to the electronic devices that are powered through the watt-hour meter. In addition to transient voltage protection, the method of the present invention also provides monitoring of the earth ground resistance, voltage and current of the earth ground conductor associated with the watt-hour meter. As such, voltage transients are suppressed when presented at the watt-hour meter through the power line input, ground resistance of the earth ground conductor in continuously monitored and the current and voltage conditions existing on the ground conductor are continuously monitored. Visual and audible indicators are provided to indicate quality issues with the grounding system and the effectiveness of the surge suppressor/arrestor.

A device for protection against voltage surges in an electric power supply line includes at least two elements (1′, 3), namely a Zener diode lightning arrester (1′) fast-blow in short circuit, and a varistor (3), arranged in parallel. One of the terminals common to the two elements (1′, 3) is connected to the line to be protected, and the other common terminal is connected to earth or to a common conductor element.

The invention discloses a thunder-lightening induced solid-phase arc-extinguishing lightning arrester. The thunder-lightening induced solid-phase arc-extinguishing lightning arrester mainly consists of a lightning arrester shell, an arc-extinguishing rotary table, an electric conduction metal plate, a starting rod, a clamping rod, an induction coil, an arc-extinguishing barrel and a counting pointer; the arc-extinguishing rotary table is arranged inside the lightning arrester shell, and a flat spiral spring for pushing the arc-extinguishing rotary table to rotate is arranged at the central position of the arc-extinguishing rotary table; the electric conduction metal plate is arranged at the upper part of the arc-extinguishing rotary table; the arc-extinguishing rotary table is provided with a plurality of arc-extinguishing gas pills in the peripheral direction; one side of each arc-extinguishing gas pill is provided with a trigger electrode and a groove respectively, one end of each trigger electrode is connected with one of trigger ends of the corresponding arc-extinguishing gas pill through a lead, and the other ends of the trigger electrodes extend out of the edge of the arc-extinguishing rotary table; and the other of the trigger ends of the corresponding arc-extinguishing gas pill is connected with the electric conduction metal plate through a lead. The thunder-lightening induced solid-phase arc-extinguishing lightning arrester is simple in structure, reasonable in design, high in arc-extinguishing ability and stable and reliable to work, and the arc-extinguishing gas pills are changed quickly and conveniently.

The invention discloses an electrified tester for a zinc oxide arrester, and relates to an instrument for detecting alternating-current parameters of a metallic oxide arrester in an electrical power system in the process of charged running. The electrified tester comprises a master machine and a slave machine; a current sensor lead wire, a current sensor unit, a program control amplification unit, a current signal processing control unit and a wireless signal receiving module are connected sequentially and are connected with an upper computer; the upper computer is respectively connected with the current signal processing control unit, a liquid crystal display, a keyboard and a mouse to form the master machine; a voltage sensor lead wire, a voltage sensor unit, a voltage signal processing control unit and a wireless signal emission module are connected sequentially to form the slave machine; and the master machine and the slave machine control signals and data through wireless communication transmission. The electrified tester is suitable for detecting total leakage current, resistive current fundamental waves and triple frequency harmonic at regular intervals on the running metallic oxide arrester and checking the running performance of the metallic oxide arrester.

The invention discloses an on-line intelligent monitoring module for intelligent transformer substation GISs, which comprises an SF6 monitoring function module, a circuit beaker monitoring function module, a capacitive equipment monitoring function modules for mutual inductors and the like, a lightning arrester monitoring function module, a station level communication function module and a human-machine interface function module. By means of the function modules, the on-line intelligent monitoring module for intelligent transformer substation GISs can monitor the gas insulation condition in a gas insulated metal-enclosed switchgear (GIS) and the operating condition of the primary equipment of each power system on line, consequently, power system operation maintainers can fully know the operating state of the GIS in real time and accordingly arrange the operation and maintenance time of the equipment, the safety of the operation of the GIS is enhanced, the safe operation of a power grid is effectively guaranteed, moreover, the maintenance method for the GIS is changed from the conventional scheduled maintenance to state maintenance, the equipment maintenance cost is effectively reduced, and the benefit of a power grid operation maintenance enterprise is increased.

PCT No. PCT/RU96/00251 Sec. 371 Date May 18, 1998 Sec. 102(e) Date May 18, 1998 PCT Filed Sep. 5, 1996 PCT Pub. No. WO97/19456 PCT Pub. Date May 29, 1997An electric power transmission line with protection devices against lightening overvoltages in the form of a lighting arrester with a surface discharge. Having a relatively long discharge path, the impulse lightening flashover does not lap over a power arc of operational frequency and, after passing of the lightening overvoltage impulse current, the line will continue a trouble-free operation without being disconnected. Simple and reliable arrester designs are disclosed among which are fittings with dielectric covers and insulators, integrating their direct functions with the lightening arrester's functions.

The invention relates to an over-voltage protection method for a modularized multi-level voltage source commutation valve. The over-voltage protection method for the modularized multi-level voltage source commutation valve comprises the following steps of: 1) determining the harshest fault working condition which causes the over-voltage stress of the modularized multi-level voltage source commutation valve; 2) determining the lightning arrester configuration mode of the modularized multi-level voltage source commutation valve; and 3) selecting a lightening arrester parameter. The step (2) of determining the lightning arrester configuration mode of the modularized multi-level voltage source commutation valve comprises the following sub-steps of: (2.1) determining a centralized protection scheme of the lightning arresters; (2.2) determining the dispersive protection scheme of the lightening arresters; (2.3) determining the amount of the lightening arresters of single convertor station; (2.4) determining the working voltage of the lightening arresters; and (2.5) determining an optimal lightening arrester protection scheme. According to the scheme provided by the invention, the over-voltage level of the voltage source commutation valve is effectively inhibited, the safe and effective operation of the voltage source commutation valve under various working conditions is protected, and the technical economy of the voltage source commutation valve is improved.

The invention relates to a full-solid-state direct-current circuit breaker of a direct-current power distribution network. The full-solid-state direct-current circuit breaker is characterized in that the direct-current circuit breaker is formed by connecting an auxiliary circuit breaker loop, a main circuit breaker loop and an energy absorption loop in parallel, and the auxiliary circuit breaker loop comprises a thyristor switch unit and a modularized full control device switch unit, and the thyristor switch unit and the modularized full control device switch unit are connected in series; the main circuit breaker loop comprises a plurality of press fit full control device switch units, a lightning arrester and a fuser, and a diode bridge type structure is adopted for two-way through flow; the energy absorption loop comprises at least one lightning arrester. The full-solid-state direct-current circuit breaker is novel in topology structure and comprehensive in function, the on-state loss is small in normal operation, the current state can be fast detected, faults can be effectively recognized, two-way current can be cut off in faults, the current turn-off grade is high, the fault removal speed is high, the voltage and energy absorption effect is good in the turn-off process, the rate of rise of fault current is effectively limited, and the series-connection valve banks of the main circuit breaker loop and the full control device of the auxiliary circuit breaker loop can be reliably protected.

An airflow arresting apparatus is provided configured to reside above an electronics rack within a data center. The apparatus includes an airflow arrester and a track mechanism. The airflow arrester includes a collapsible panel sized and configured to reside above the electronics rack, and when operatively positioned above the electronics rack, to extend vertically above the electronics rack and at least partially block airflow from passing over the electronics rack between the air outlet and air inlet sides of the rack. The track mechanism is sized and configured to reside above the electronics rack, and the airflow arrester is slidably engaged with the track mechanism. Positioning of the airflow arrester at a desired location above the electronics rack is facilitated by the airflow arrester slidably engaging the track mechanism.

The invention relates to an inspection system for an unattended substation, which comprises a substation on-site video camera, a video processing server, an infrared imaging instrument, an oil chromatography on-line monitor, a switch cabinet temperature sensor, an arrester on-line monitor, a SF6 gas micro-water density on-line monitor, an air quality sensor, a direct current on-line monitor, a protection information remote transmitter, an auxiliary device remote opener, a database server and a WEB server, wherein all the parts of the system are connected together through an electric MIS (management information system) network. By utilizing the intelligent inspection software, an integrated substation equipment monitoring system is formed by the video, the various sensors and the related circuit. The system provided by the invention has the advantages that the on-line monitoring data of equipment, the protection information and the images under the normal running state of the equipment are simultaneously automatically tracked and displayed when a person on duty monitors the appearance of equipment.

The invention discloses an automatic recognition method for lightning arrester gauge reading, which is characterized in that recognition for a lightning arrester gauge is divided into region segmentation and reading recognition; firstly, a gauge dial is segmented into multiple regions by using a connected region detection algorithm and a rectangle fitting algorithm; then the regions are detected by using prior knowledge, and connected regions representing a pointer region and a digital region is reserved; then minimum area rectangle fitting is performed on the two connected regions to acquire two rectangles with a deflection angle; rotation correction is performed on an image according to the angle, then the pointer region and the digital region are segmented from the corrected image; and finally, reading recognition is performed on the pointer region and the digital region by respectively using an angle method and a convolutional neural network method. According to the automatic recognition method, pointer reading recognition and digital reading recognition can be accomplished simultaneously, effective correction can be performed on the image, and the reading accuracy is improved.

The invention relates to a lightning protection and especially relates to a 10-35kV overhead transmission line constraint space injection gas arc extinguishing lightning protection gap apparatus which is suitable for a 10-35kV overhead transmission line. The apparatus is installed in parallel on two ends of a line insulator string to protect a flash-over voltage between gaps to be less than the voltage of a protected insulator string so that the apparatus is punctured prior to the protected insulator string when the power transmission line is suffered from lightning stroke. During disruptive discharging, a signal acquisition device automatically senses a lightning current signal and triggers a high speed injection gas generation apparatus. A high speed injection air flow is instantly generated so as to carry out great impact on a follow current arc in a constraint space along a vertical direction, and carry out cooling till the arc is quenched. According to the invention, a structure is simple, installation and maintenance are convenient. Through using the apparatus of the invention, when the line is suffered from the lightning stroke, a lightning current can be rapidly led to the ground and simultaneously a high speed airflow quenching power frequency follow current is generated so that electric equipment can be effectively protected and power supply reliability is increased.

A composite moving apparatus made substantially of composites may include a plurality of longitudinal conductive electrical pathways extending along a substantial length of the composite moving apparatus, and a plurality of lateral conductive electrical pathways extending along a substantial lateral width of the composite moving apparatus. The longitudinal and lateral conductive electrical pathways may be connected in order to provide redundant electrical pathways extending along a substantial portion of the composite moving apparatus. The redundant electrical pathways may carry return current, carry fault current, provide grounding, carry lightning current, provide electromagnetic shielding, minimize resistance and voltage differential, and/or provide a bleed path for electrostatic charge.

The invention relates to a series capacitor type high-voltage direct current breaker and a control method thereof. The breaker comprises direct current breaker units which are connected in series, and each direct current breaker unit comprises a change-over switch, a switching circuit and an energy consumption device which are connected in parallel. The change-over switch adopts a mechanical switch, and the switching circuit adopts a resistance capacitance branch circuit, and the energy consumption device adopts a lightning arrester. The high-voltage direct current breaker is connected with a control circuit, and the mechanical switch detects failure current and acts at the T1moment, and transfers the failure current into the resistance capacitance branch circuit. The failure current charges a capacitor, and controls switching-on and switching-off of the mechanical switch. Before the mechanical switch witches off at the T2 moment, charging voltage on two ends of the capacitor throughout is lower than arcing voltage at fractures of the mechanical switch. When the voltage on two ends of the capacitor reaches operation voltage of the lightning arrester, the control circuit controls the lightning arrester to act at the T3 moment so that energy can be released from the lightning arrester. According to the series capacitor type high-voltage direct current breaker and the control method thereof, the mechanical switch does not have electric arc, non-arc breaking off is realized, energy is released through utilization of the lightning arrester, quick extinguishing of the electric arc is realized, and the failure current is cut off.

The invention provides a novel valve tower of a thyristor converter valve. The novel valve tower comprises a valve hall, a valve tower body, a valve support (6) and a lightning arrester (9). The valve tower body and the lightning arrester (9) are hung on the lower edge of a steel beam on the top of the valve hall through a suspended insulator chain. The valve tower body is composed of a top shielding case (4), a bottom shielding case (1) and valve layers between the top shielding case (4) and the bottom shielding case (1). The valve tower body is composed of a left half tower body and a right half tower body. Each valve layer is composed of two converter valve modules (2). The valve layers and the bottom shielding case (1) are suspended below the top shielding case (4) through interlayer insulators (3) arranged between the adjacent valve layers and arranged between the valve layers and the bottom shielding case (1). By the adoption of the structure, the valve tower body and the steel beam on the top of the valve hall can swing relatively, the valve layers can also swing relatively, and therefore the valve tower is high in overall flexibly and good in anti-seismic effect.

The present invention refers to resistance current value on-line monitoring method in lightning arrester leakage current. It contains firstly leakage total current signal ix (t), detecting said leakage total current signal (t) semiwave first peak value, and setting It as capacity current peak value ICP; secondly calculating resistance current IR through formula IR=Ix (t-ICP * cos { (-tcp) * 360 / }, to obtain resistance current value, wherein IR being resistance current, t being any time, tcp being corresponded ICP time, being total current cycle. The present invention can eliminate lightning arrester interphase disturbing influence, enhancing lightning arrester state monitoring validity for raising systems operation reliability.

The present invention provides a gas-insulated electric apparatus which includes: a vertically-arranged gas insulation main tank; a first gas insulation branch pipe connected to and making right angle with the gas insulation main tank; a second gas insulation branch pipe connected to and making right angle with the gas insulation main tank; a breaker manipulator which is arranged on an upper side of the main tank, a feeder-side current transformer which is incorporated in the first gas insulation branch pipe; a voltage transformer arranged on the first gas insulation branch pipe; and an arrestor arranged on the first gas insulation branch pipe and connected with the feeder.