2353 results about "Lightning arrester" patented technology

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 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.

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.

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.

The invention relates to a hybrid DC current breaker topological structure. The hybrid DC current breaker topological structure is structurally characterized by comprising three parallel branches, wherein the first branch comprises a first mechanical switch K1, a second mechanical switch K2 and a capacitor C; the first mechanical switch K1 and the second mechanical switch K2 are connected in series and the second mechanical switch K2 and the capacitor C are connected in parallel, so as to get continuity of the normal working current of a system; the second branch is a solid-state switch S which is composed of a plurality of IGBT modules connected in series, wherein each IGBT module comprises two IGBTs in reversed series connection and is used for realizing two-way cutoff of fault current; the third branch is an energy release branch consisting of multiple ZnO lightning arresters in series and parallel connection. The hybrid DC current breaker disclosed by the invention has the advantages of low loss, achievement of two-way rapid cutoff and guarantee of reliable continuity of the solid-state switch.

The invention discloses an operating status detection system for area equipment in a converting station. The operating status detection system for the area equipment in the converting station comprises a physical layer, a link circuit layer and an appliance layer, and the physical layer, the link circuit layer and the appliance layer are connected in sequence. The physical layer comprises two buses, and the two buses are connected through a plurality of bus return circuits. The bus return circuits comprise a plurality of disconnection mutual inductance units. The disconnection mutual inductance units comprise breakers and current mutual inductors, and the breakers and the current mutual inductors are connected in series. Each bus is connected with outlet lines through the disconnection mutual units. Each outlet line is provided with a voltage mutual inductance unit. The voltage mutual inductance unit comprises a lighting arrester, a voltage mutual inductor and a merging unit. Each bus is further provided with the lightning arrester and the voltage mutual inductor. The plurality of outlet lines are further provided with a main transformer. The plurality of merging units are connected with an equipment status detection analysis device in a converting station area and a power quality detection analysis device. The operating status detection system for the area equipment in the converting station has the advantage of achieving estimating and analyzing the operating status of certain area equipment of the electric system from the perspective of the electric power system analysis.

Devices for arresting a wheeled vehicle with rubber tires, comprising elongated flexible member (11) such as strips, mats, cables or chains disposed along the direction of motion and adapted to wrap around the tires using a tire attaching means (14) such as barb, spike or adhesive, the tire attaching means being fixed to the proximal end of the flexible member with respect to the vehicle's motion, and an arresting means (16) such as a rod attached to the distal end of the flexible member and adapted to interfere with the vehicle motion. The spikes may be anchoring in the tire and the cable or chain may be strong enough to tear the tires. The devices may be disposed in a flat housing with movable cover for allowing free passage of the vehicle.

The invention provides a method for extracting the resistive current of a metal oxide arrester (MOA). The technical scheme comprises the following steps of: acquiring a voltage signal applied to the arrester and leakage current flowing through the MOA and performing fast Fourier transform on the voltage signal to acquire the amplitude and phase of each subharmonic; acquiring a capacitive current signal of which the waveform is the same as that of capacitive current of the arrester and the amplitude is in proportion to that of the capacitive current of the arrester according to a phase relationship between a voltage signal and a current signal on a capacitor and the acquired amplitude and phase of each subharmonic of voltage; and acquiring the resistive current of the arrester according to the principle that the resistive current is orthogonal to the capacitive current of the arrester. The method has a rigorous principle and is convenient to implement; a digital signal has high anti-jamming capability; phase shift is processed by the fast Fourier transform, so even if each subharmonic exists theoretically, errors cannot be generated; and the measurement accuracy of the resistive current can be effectively improved in practical application.

The invention relates to an on-line monitoring system for data collection of electric arresters based on GPS (Global Positioning System) synchronization. The on-line monitoring system comprises a back-stage management server, wherein the back-stage management server is connected to a station control central unit; terminal devices are connected to the station control central unit; synchronous data of running parameters of the electric arresters which are in a network are collected by the terminal devices; power is supplied to the terminal devices by remote optical fibers of the arrester station control central unit; optical fiber communication is utilized to transmit the data; the station control central unit has a GPS time service function and is used for supplying synchronously collected pulses to the terminal devices distributed in different places, thereby realizing synchronous data collection; and inspection personnel can conveniently perform field check and state display on the running parameters of a plurality of local arresters by virtue of a man-machine interface of the station control central unit. Meanwhile, the collected data can be transmitted to the back-stage management server through the optical fibers or in a backup GPRS (General Packet Radio Service) wireless manner; therefore, the system has the characteristics of reducing the working strength of maintenance personnel and finding out potential hidden dangers of the arresters in time and is high in safety.

The invention relates to distributed wireless high-voltage equipment insulating live testing system and a testing method. The testing system is characterized in that the testing system comprises at least three testing circuits; the testing circuit for testing voltage, current amplitude and phase comprises a voltage data collection end and more than two current data collection ends, output ends of the voltage data collection end and the current data collection ends are respectively connected with an input end of a collection terminal, and the output ends of the collection terminals are connected with a control end through a wireless network. As the invention adopts the high-precision multi-circuit testing system constituted by a distributed sensor network which adopts the wireless sensor network transmission technology and the GPS synchronization collection technology, the testing efficiency of the system is improved. The invention can be widely applied to the live testing of capacitance of capacitive equipment, dielectric loss and resistive current of arresters in various electric power systems.

The invention belongs to the technical field of electric power on-line monitoring, relating to an on-line monitoring device of a metallic oxide arrester. The on-line monitoring device comprises a protecting circuit, a movement time detecting unit, a leakage current sampling circuit and a collecting board, wherein, the upper end of a varistor in the protecting circuit is connected with a metal oxide arrester (MOA), and the lower end thereof is grounded; the movement time detecting unit is connected with a leakage current sampling unit in series and then is connected with an output end of the choke coil in the protecting circuit; an output end of the movement time detecting unit is connected with one path of input end of the collecting board; an output end of the leakage current sampling unit is connected with the other path of input end of the collecting board; the collecting board is used for collecting signals and realizing on-site display and data remote transmission; a computer monitoring center collects information from the collecting board so as to carry out analysis treatment and fault alarming.

The invention discloses a network-side circuit of an electric locomotive unit, which comprises two network-side circuit bodies with pantographs. Each network-side circuit body consists of a high-voltage transformer, the pantograph, a high-voltage isolating switch, a main circuit breaker, a grounding switch, a lightning arrestor, a primary-side high-voltage current transformer, a transformer, a primary-side grounding current transformer and a shaft end grounding device. The high-voltage circuit of the electric locomotive unit further comprises a high-voltage circuit body without a pantograph, the high-voltage circuit consists of a main circuit breaker, a grounding switch, a lightning arrestor, a primary-side high-voltage current transformer, a transformer, a primary-side grounding current transformer and a shaft end grounding device. The three high-voltage circuit bodies are connected by roof high-voltage buses and high-voltage connecting cables. The network-side circuit of the electric locomotive unit can meet the requirement of heavy-load and high-power traction, an optional network-side high-voltage electric component can be isolated when breaking down, and power loss of an integral locomotive is minimized assuredly after fault isolation.

The invention discloses an all-solid-state DC breaker and a control method thereof. The all-solid-state DC breaker, including a long-term flow passage branch, a current cut-off branch and an energy absorption branch that are connected in series, is characterized in that the long-term flow passage branch includes at least one half-control device and at least one full-control device that are in series connection, and a full-bridge circuit is adopted to achieve bidirectional flow passages; the current cut-off branch is formed by a circuit break unit including a full-control device, an RCD absorption circuit and a lightning arrester that are connected in series, and a full-bridge circuit is adopted to achieve bidirectional flow passages; and the energy absorption branch includes at least one lightning arrester. The all-solid-state DC breaker is simple and novel in topological structure and low in on-state loss, the number of full-control devices is reduced, and the control complexity and costs are reduced. Faulty currents can be removed quickly. The faulty currents are prevented from increasing through separate control of cut-off units, so the breaker effectively copes with short circuit and overload faults in a DC system while having a current limiting function. The DC system can be protected and runs safely.

The invention relates to a high potential gradient zinc oxide pressure-sensitive resistor material and a preparation process thereof. The high potential gradient zinc oxide pressure-sensitive resistor material with uniform particle sizes is obtained by weighing a main material ZnO, a doping oxide, and a product rare earth oxide obtained by carrying out thermal decomposition on a rare earth oxalate or/and carbonate or/and hydroxide according to proportions, carrying out high energy wet grinding, drying, presintering at 200-800DEG C, carrying out high energy dry grinding, and sintering at 800-1100DEG C. The preparation process of the invention has the advantages of simplicity, low cost, environmental protection and low energy consumption, and the prepared zinc oxide pressure-sensitive resistor material can be used for preparing high quality lightning arrester products for ultrahigh electric power systems.

As hierarchical distributed system with open-ended characteristic, the basic frame comprises: the first layer as sensor unit, the second layer as on-line monitor terminal, the third layer for substation monitor, and the fourth layer for bureau monitor. This invention uses uniform communication protocol, and reduces investment and daily maintenance.

The invention provides a bidirectional mechanical direct-current circuit breaker based on a commutation driving circuit and a control method of the bidirectional mechanical direct-current circuit breaker. The bidirectional mechanical direct-current circuit breaker comprises a current passage branch circuit, a commutation branch circuit and an energy-absorbing and voltage-limiting branch circuit, wherein the current passage branch circuit comprises one or a plurality of mechanical switches serially connected with one another; the commutation branch circuit consists of a high-voltage capacitor and a commutation driving circuit which are connected serially; the energy-absorbing and voltage-limiting branch circuit consists of a lightning arrester; and the current passage branch circuit, the commutation branch circuit and the energy-absorbing and voltage-limiting branch circuit are connected with one another in parallel. When bidirectional current requires to be switched on or switched off, current can be transferred to the commutation branch circuit at first from the current passage branch circuit, and then is transferred to the energy-absorbing and voltage-limiting branch circuit, and finally, switch-on and switch-off of the bidirectional current are realized. The bidirectional mechanical direct-current circuit breaker based on the commutation driving circuit has the advantages of low cost, simple structure and high reliability.

The invention discloses a residual voltage test circuit of a controllable metal oxide arrester and a method thereof. The test circuit comprises an impulse current generation device, an impulse modulation capacitor, a voltage divider, a Rogowski coil and a wave form recorder; wherein the impulse current generation device generates operation impulse current and/or lightning impulse current, and is provided with a high voltage output end and a low voltage output end; the impulse modulation capacitor is connected in parallel with a controllable arrester sample between the high voltage output end and the low voltage output end; one end of the voltage divider is connected with the high voltage output end of the impulse current generation device, while the other end is earthed; the Rogowski coil is directly sleeved on a conductor on a branch circuit of the controllable arrester sample; the wave form recorder is connected with the voltage divider and the output end of the Rogowski coil respectively, and is used for recording voltage and current wave form of the controllable arrester sample. The residual voltage test circuit for the controllable arrester and the method thereof prolong wave head time of the residual voltage on the controllable arrester sample by using the impulse modulation capacitor without changing parameters of the test circuit or the wave form of the lightning impulse current, so that tests have better system equivalence.