30results about How to "Reliable arc extinguishing" patented technology

The invention relates to a lightning protection device and especially relates to a multi-interspace self-expanding strong-airflow arc extinguishing lightning protection device used in power transmission lines with different voltage grades. The device is installed in parallel on one side of a line insulator substring. Insulation strength of a main discharge protection gap and an auxiliary discharge gap is less than the insulation strength of the protected insulator substring so that an overvoltage generated when lightning stroke is generated on the line punctures the protection gap preferentially. When the protection gap is punctured so as to discharge, high temperature arc is generated in the auxiliary discharge gap, air is rapidly heated and expanded in a semi-closed space of the auxiliary discharge gap so that the arc is elongated and is erupted along a gas guidance hole. Simultaneously, a signal acquisition device automatically collects signals and starts a gas generation apparatusso as to instantly generate high speed airflow to extinguish the arc. The protection device of the invention has a simple structure. Installation is convenient. When the lightning stroke is generatedon the line, the lightning current can be rapidly leaked to the ground and simultaneously the high speed airflow is generated to extinguish the arc. Therefore, electric power equipment can be effectively protected and power supply reliability can be increased.

The invention discloses a reliable arcing system of a non-polarity high-voltage direct current contactor. The reliable arcing system of the non-polarity high-voltage direct current contactor comprises a sealed contact chamber of the contactor and at least two permanent magnets, wherein two fixed contacts are fixedly installed in the contact chamber, two normally-opened movable contacts are movably installed in the contact chamber, and the two movable contacts and the two fixed contact are matched correspondingly in the vertical direction respectively; the permanent magnets are installed on the side of the extension line of the connection line of the two fixed contacts, and the magnetic direction of the permanent magnets is set not to be perpendicular to the current direction between the movable contacts and the fixed contacts. The arcing magnets and heat dissipation grid pieces of a special structure are arranged in the contact chamber of the direct current contactor, so that the electric service life of load switching can be prolonged by more than ten times, meanwhile, the non-polarity requirement of the contacts is met, and the contactor of the working voltage of 200-1000V can really meet the requirement for service life of whole matched equipment.

The invention discloses a voltage control method for the active arc extinction device of a power distribution network. According to the method, the method is used for controlling the output voltage ofthe active arc extinction device connected between a neutral point and the earth. In this way, the output voltage of the active arc extinction device is kept consistent with a fault phase voltage during the occurrence of the single-phase earth fault of the device. As a result, the purpose of fault arc extinction is achieved. According to the method, the purpose of controlling the output voltage is achieved by injecting a specific current into the neutral point. The current comprises active, reactive and harmonic components corresponding to the fault current. The control method specifically comprises two parts, namely a neutral point voltage outer ring and an output filter inductance current inner ring. The outer ring adopts a combined form of a proportional integrator and a proportional resonance controller, wherein the voltage of the neutral point is adjusted to generate a current inner loop given value. The inner loop adjusts the inductance current of an output filter by adopting aproportional regulator so as to track a current inner ring given value, and improves the current control accuracy through the capacitance voltage feedforward of the output filter. Therefore, no capacitance current is required. The purpose of arc extinction under the condition of the change of the grounding resistance and the distortion of the fault current can be realized.

The invention belongs to the field of electronics, and particularly discloses a current monitoring type electronic arc-control device which is suitable for the arc-control purpose for a mechanical switch. The current monitoring type electronic arc-control device comprises a power semiconductor device connected with the mechanical switch. At least one current sensor is connected with the mechanical switch and used for detecting the switch-on and switch-off of the mechanical switch. The output end of the current sensor and the control end of the power semiconductor device are connected with a control circuit. The control circuit controls the power semiconductor device to be powered off when detecting the switch-off of the mechanical switch. The current monitoring type electronic arc-control device has the advantages that the switch-on time of a thyristor is short, and reliability is high.

A line selecting system for automatic tuning of master - slave arc quenching coil and earthing fault of small current comprises master arc quenching coil operated on 15 % over - compensation mode at system normal operation, slave arc quenching coil formed by four reactors, a vacuAum high voltage contactor being connected to each of reactors. It featured as operating system on over - compensation mode and setting slave arc quenching coil out of system when system is on normal operation, switching in slave arc quenching coil to operate system on full compensation mode for ensuring arc quenching when single phase earthing fault is existed on system.

The invention discloses a medium voltage DC vacuum circuit breaker main circuit topology, which comprises a main current path formed by serial connection of vacuum circuit breakers VB1 and VB2, a commutation breaking circuit formed by serial connection of a commutation capacitor C, an auxiliary switch S and a commutation inductor L, an auxiliary breaking circuit formed by serial connection of an auxiliary inductor La and an auxiliary capacitor Ca and an energy absorbing circuit formed by a varistor RV, wherein the main current path, the commutation breaking circuit and the energy absorbing circuit are connected in parallel; and the auxiliary breaking circuit and the vacuum circuit breaker VB1 are connected in parallel. The invention also discloses a commutation breaking method. In the caseof small current of a breaking DC system load, the vacuum circuit breakers VB1 and VB2 operate in sequence; and in the case of high current of fault of the breaking DC system, the vacuum circuit breakers VB1 and VB2 operate simultaneously. The medium voltage DC vacuum circuit breaker main circuit topology and the breaking method thereof have the characteristics of a reliable high current breakingprocess, quick small current breaking process and the like, and are suitable for a medium voltage DC high current system, and certain advantages are achieved in aspects of the device shape, the volume and the cost.

The invention discloses a high-voltage direct-current circuit breaker comprising an alternating-current circuit breaker switch, a first power electronic circuit connected with the input end of the alternating-current circuit breaker switch at one end and used to convert direct current into alternating current, and a second power electronic circuit connected with the output end of the alternating-current circuit breaker switch at one end and used to convert alternating current into direct current, wherein the other end of the first power electronic circuit and the other end of the second power electronic circuit are connected to a direct-current transmission line. Through cooperation between the alternating-current circuit breaker switch and the power electronic circuits, direct current is converted into alternating current first, and then, alternating current is converted into direct current after arc extinguishing. Thus, direct-current arc extinguishing has the advantages achieved by alternating-current arc extinguishing, and the problem of long action time is avoided.

The invention relates to a clearance overvoltage damping device, including an insulation cylinder, the interior of which is fixedly provided with a non-inductance resistor and a gas discharge tube, the non-inductance resistor is connected with the gas discharge tube in series, and terminal blocks are arranged on the insulation cylinder. The overvoltage which is caused by the transition process when throwing and cutting a capacitor group can be inhibited effectively, the invention can prevent the occurrence of the accidents of a capacitor, a discharge coil, a circuit breaker and other equipments, ensures the safe power supply and has obvious damping effect for the transition process which is caused by switching-on and re-ignition, the protection capability is strong and the service life is long.

The invention discloses a transformer on-load adjustable capacity switch easy in realization. The switch comprises a high voltage coil switching system and a low voltage coil switching system. The high voltage coil switching system at least comprises an angle connection vacuum arc extinguishing chamber, a start connection vacuum arc extinguishing chamber and a transition vacuum arc extinguishing chamber; the transition vacuum arc extinguishing chamber is connected to a transition resistor; when the angle connection vacuum arc extinguishing chamber is switched-on, a high voltage coil forms triangle connection; and when the star connection vacuum arc extinguishing chamber is switched-on, the high voltage coil forms star-shaped connection. According to the switch of the invention, in the star and angle switching process, the transition vacuum arc extinguishing chamber, the start connection vacuum arc extinguishing chamber and the angle connection vacuum arc extinguishing chamber only act for once and act successively; the action time of the transition vacuum arc extinguishing chamber is not limited by the action time of the other two vacuum arc extinguishing chambers; the action intervals among the vacuum arc extinguishing chambers can be set according to the arc extinguishing time demands; and the reliable arc extinguishing in the star and angle switching process can be realized through a simple mechanical mechanism.

The invention discloses an isolated bipolar double-breakpoint circuit breaker, which comprises a shell, a wiring terminal, a contact system, an operating mechanism and a conductive loop, and is characterized in that an insulating partition plate is arranged on a longitudinal section in the shell and divides the interior of the shell into a first chamber and a second chamber which are insulated from each other; a conductive loop is arranged in each of the first chamber and the second chamber, and the two conductive loops are not communicated with each other; the conductive loop comprises a first wiring terminal, a second wiring terminal, a static contact and a moving contact, wherein the first wiring terminal and the second wiring terminal are arranged at the two ends of the shell. The operation structure is installed in the first cavity or the second cavity, and the operation structure controls the moving contact to enable the two conductive loops to be connected or disconnected at the same time. According to the invention, the two circuits are arranged in the two spaces which are completely insulated from each other, and the two breakpoints are arranged in a staggered manner, so that the temperature rise is low, the opening speed is high, and complete arc isolation is realized.