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2353 results about "Lightning arrester" patented technology

A lightning arrester (alternative spelling lightning arrestor) (also called lightning diverter) is a device used on electric power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning. The typical lightning arrester has a high-voltage terminal and a ground terminal. When a lightning surge (or switching surge, which is very similar) travels along the power line to the arrester, the current from the surge is diverted through the arrester, in most cases to earth.

Thunder-lightening induced solid-phase arc-extinguishing lightning arrester

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.
Owner:王巨丰 +1

Electrified tester for zinc oxide arrester

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.
Owner:WUHAN XINDIAN ELECTRICAL TECH

On-line intelligent monitoring module for intelligent transformer substation GISs (gas insulated switchgear)

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.
Owner:NARI TECH CO LTD

Over-voltage protection method for modularized multi-level voltage source commutation valve

ActiveCN103050955AReduce overvoltage levelsReduced insulation level requirementsEmergency protective arrangements for limiting excess voltage/currentEngineeringVoltage source
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.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2

Full-solid-state direct-current circuit breaker of direct-current power distribution network

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.
Owner:RONGXIN HUIKO ELECTRIC TECH CO LTD +1

Series capacitor type high-voltage direct current breaker and control method thereof

ActiveCN103117528ARealize no arc breakingMeet the demand for fast cut-off fault currentEmergency protective arrangements for automatic disconnectionHigh-voltage direct currentTypes of capacitor
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.
Owner:CHINA EPRI ELECTRIC POWER ENG CO LTD +1

Operating status detection system for area equipment in converting station

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.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1

On-line monitoring system for data collection of electric arresters based on GPS (Global Positioning System) synchronization

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.
Owner:上海格蒂电力科技有限公司

All-solid-state DC breaker and control method thereof

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.
Owner:RONGXIN HUIKO ELECTRIC TECH CO LTD +1

Bidirectional mechanical direct-current circuit breaker based on commutation driving circuit and control method of bidirectional mechanical direct-current circuit breaker

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.
Owner:TSINGHUA UNIV

Residual voltage test circuit of controllable metal oxide arrester and method thereof

ActiveCN101598757AExtend wave timeGood equivalenceElectrical testingElectrical conductorLow voltage
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.
Owner:CHINA ELECTRIC POWER RES INST
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