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

The present invention discloses a power distribution network active arc extinction device and a current control method thereof. The device is configured to inject power current into the neutral point of a power distribution network to reach the purpose of earth fault arc extinguishing. The amplitude and the phase of the injection current may be obtained through the injection of special current into the neutral point twice and through combination of corresponding calculation methods. An injection current controller is formed by a proportion resonance controller, modulation signals are obtained by using injection current deviation signals through the proportion resonance controller, an inverter switch tube is driven after the modulation signals are subjected to triangle carrier modulation to generate inversion current, and the inversion current is outputted to the neutral point of the power distribution network after passing through a filtering circuit. The power distribution network active arc extinction device is fast in response speed, high in sensitivity and low in cost, and is able to realize rapid and reliable arc extinguishing of instant earth faults.

The invention discloses an easy-to-implement transformer on-load capacity regulation switch, which includes a high-voltage coil switching system and a low-voltage coil switching system. A transition vacuum interrupter with transition resistance, the delta connection vacuum interrupter makes the high voltage coils in a delta connection when it is switched on, and the star connection vacuum interrupter makes the high voltage coils in a star connection when it is switched on. In the star-angle conversion process of the present invention, the transitional vacuum interrupter, the star-connected vacuum interrupter and the delta-connected vacuum interrupter only need to operate once, and each of them operates sequentially, and the action time of the transitional vacuum interrupter is not long. Limited by the action time of the other two vacuum interrupters, the action interval between each vacuum interrupter can be set according to the requirements of the arc extinguishing time; reliable extinguishing during the star-angle conversion process can be realized through a simple mechanical mechanism arc.

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 provides an on-load capacity-regulating switch with a single fracture, aiming at solving the technical problems that the switching task of transformer windings needs to be finished when a transformer is on load and overcoming the technical difficulty of unreliable arc quenching when a high-voltage side contact is subjected to star-to-angle switching. The on-load capacity-regulating switch is mainly characterized by comprising two main contact connecting wires and a transitional contact connecting wire, wherein a transitional resistor and a second vacuum arc-quenching chamber areconnected to the transitional contact connecting wire in series; one main contact connecting wire is an angle-joint main contact connecting wire provided with a first vacuum arc-quenching chamber, and the other main contact connecting wire is a star main contact connecting wire provided with a third vacuum arc-quenching chamber; and the on-load capacity-regulating switch is also provided with a driving device for driving all the vacuum arc-quenching chambers. The on-load capacity-regulating switch has the advantage that the arc quenching can be reliably realized just by arranging one fracture.

The invention relates to a gas insulating ring-network cabinet using SF6 gas as an insulating and arc-extinguishing medium. The gas insulating ring-network cabinet mainly comprises a gas box, a T-shaped spring mechanism, a three-station load switch which is provided with one to six groups of common box structures and an external box type metal framework supporting the gas box. The three-station load switch is electrically connected with an external load or a power supply by insulated cable fittings and an insulated sleeve, a branch bus and a main bus which are sealed in the gas box. The gas insulating ring-network cabinet can be used for a ring-network power supply system with a rated voltage not higher than 12 kV, load control and short-circuit protection, and has the advantages of simple structure, convenience in operation, capability of being not affected by environment and the like.

The invention relates to a direct current circuit breaker, a control method and device thereof. The method comprises the following steps that: after a system has a short circuit fault, a mechanical switch in a main current circuit is controlled to be disconnected and a zero current circuit is controlled to be conducted; when the current of a mechanical switch S is reduced to zero, a zero-voltage circuit is controlled to be conducted, so that a loop is formed between the zero-voltage circuit and a zero-current circuit to carry out follow current, and the voltage clamp at two ends of the mechanical switch is zero so as to prevent an arc from rekindling; after the follow current is finished, the system voltage reversely charges a precharging capacitor in the zero-current circuit to complete the disconnection. According to the invention, a zero-crossing point of the current is manufactured through the forerunner zero-passing current circuit, so that a zero-crossing arc of the mechanical switch is extinguished, and the short-circuit current is ensured to be completely transferred to a null-current circuit; then the zero-voltage circuit is switched on to clamp the recovery voltage of themechanical switch after the arc is extinguished so as to prevent the arc from rekindling and ensure that the mechanical switch is reliably extinguished.

The present invention discloses a high-voltage no-reignition vacuum circuit breaker which mainly solves the problems in the prior art that the time corresponding to an optimal arc extinguishing open distance at opening cannot be prolonged, the opening and closing output power is low, a main shaft swings and bends during a rotation process, etc. The vacuum circuit breaker comprises a supporting rack, an installing pedestal, an operating mechanism, a magnetic sleeve, a contact, an insulating pull rod and a vacuum arc-extinguishing chamber, wherein the operating mechanism also comprises an operating mechanism box, the main shaft, a reduction gearbox, an energy storage motor, an opening spring, a closing energy storage rod, a first closing spring, an auxiliary switch, an opening button, a closing button, an energy storage indicating part, a movable energy absorption limiting device, an overshoot adjusting pad, an energy storage limiting arm, an opening measure, a closing measure, a first closing energy storage connecting lever, a closing coil, an opening coil, a speed regulation device, a supporting bearing, a second closing energy storage connecting lever and a second closing spring.The high-voltage no-reignition vacuum circuit breaker of the present invention has the advantages of being simple in structure, large in output power, reliable in speed reduction and excellent in arcextinguishing performance, etc.

The invention discloses a voltage-sharing type lightning-protection clearance device capable of deeply restraining power frequency, follow current and electric arcs. The voltage-sharing type lightning-protection clearance device capable of deeply restraining the power frequency, the follow current and the electric arcs comprises a grounding side arc extinguishing device, and a grounding side fitting (2) and a wire side fitting (14) which are arranged on two ends of a circuit insulator chain (1) in parallel through fixing devices. The grounding side arc extinguishing device and a wire side arc extinguishing device are respectively arranged on the other ends of the grounding side fitting (2) and the wire side fitting (14). A connection slim tube (3) is arranged on the other end of the grounding side fitting (2). One end of a non-metallic material grounding electrode (12) of the grounding side arc extinguishing device is connected with the connection slim tube (3) on the grounding side fitting (2) in an inlaid mode through a Z-shaped connection fitting (4), and the other end of the non-metallic material grounding electrode (12) is connected with a signal collecting device (11). Grading rings of the device can attract lightning current so that almost 100% of electric arcs enter into arc extinguishing cavities. When the device disruptively discharges, air-producing material inside a constraining space is rapidly heated by high-temperature electric arcs to produce high-voltage air, the signal collecting device collects signals automatically and starts a gas injection generating device at the same time, high-speed airflow is generated instantly to impact, cool and extinguish the electric arcs along the lengthways direction, and thus the stability of a power system is improved. The Z-shaped connection fitting (4) is arranged so that the arc extinguishing devices can be replaced conveniently, maintenance cost of a power grid is reduced and operation efficiency is improved.

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 gas injection type parallel gap device. The protection device belongs to the field of lightening protection gap for power transmission lines of alternating-current and direct-current electric power systems. The device is connected with the two ends of a power transmission line insulator chain in parallel, under a lightening stroke, the device is broken down before the insulator chain can be broken down, and thus the insulator chain and the corresponding power transmission line can be protected; moreover, a high-speed high-voltage gas flow can be generated fast and acts on arcs to restrain formation and development of the arcs, the arcs are extinguished in a transient state, and thus the lightning trip-out rate and the lightening accident rate of an electric power system are reduced. The gas injection type parallel gap device comprises arc-control devices on the grounding side and the wire side, fixing devices and parallel spiral fittings installed at the two ends of the insulator train of the line. The arc-control device on the grounding side and the arc-control device on the wire side respectively comprise an arc extinguishing powder storage chamber, an arc air-termination ring, an insulating gas generation chamber, an arc spray channel and the like. With the device, the stability of the electric power system is improved, the on-load action frequency of a breaker is effectively reduced, the service life of electric power equipment such as a transformer is prolonged, and production, operation and maintenance cost is very low.

The invention discloses a reliable arc extinguishing nonpolar high-voltage DC contactor arc extinguishing system, which comprises a sealed contact chamber of a contactor and at least two permanent magnets; two static contacts are fixedly installed in the contact chamber There are two normally open moving contacts in the activity, and the two moving contacts are vertically matched with the two static contacts; the permanent magnet is installed on the extension line side of the two static contacts, The magnetic direction of the permanent magnet is set to be non-perpendicular to the current direction between the moving and static contacts. In the present invention, by arranging special-structured arc-extinguishing magnetic blocks and heat dissipation grids in the contact chamber of the DC contactor, the electrical life times of on-load switching can be increased by more than ten times, and at the same time, the non-polarity requirement of the contacts is realized. Make the contactor with the working voltage of 200-1000V really meet the service life requirements of the complete machine of its supporting 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.