63results about How to "Reduce arc energy" patented technology

Maintenance trip functions override the normal or specified trip functions of a low voltage circuit breaker to reduce pickup currents and / or time delays to effect faster trips, which reduces arc energy produced by faults during maintenance or testing on a live circuit breaker.

Maintenance trip functions override the normal or specified trip functions of a low voltage circuit breaker to reduce pickup currents and / or time delays to effect faster trips, which reduces arc energy produced by faults during maintenance or testing on a live circuit breaker.

An apparatus for controlling an electric switching device (1) for alternating current arranged in a current path for opening the switching device and for breaking the current in the current path after occurrence of a fault current comprises members (15) adapted to detect the current in the current path and a unit (20) adapted to control the electric switching device to break the current in the current path directly after a half wave of the alternating current having a peak value below a predetermined current limit value, so that the breaking is completed through a zero-crossing of the alternating current terminating a said half wave.

The invention provides a contact arc-extinguishing system used for a dual-power-supply automatic changeover switch. The contact arc-extinguishing system comprises a commonly used power supply contact component, a backup power supply contact component and an arc-extinguishing shield. The backup power supply contact component and the commonly used power supply contact component are arranged in an opposing way. The moving contact acting surface of a commonly used power supply moving contact group and the moving contact actuating surface of a backup power supply moving contact group are arranged in different working planes. The arc-extinguishing shield is provided with a commonly used power supply arc-extinguishing chamber and a backup power supply arc-extinguishing chamber which are mutually isolated. The extension length of the commonly used power supply arc-extinguishing chamber and the backup power supply arc-extinguishing chamber along the longitudinal direction of the dual-power-supply automatic changeover switch is equivalent to distance from the commonly used power supply contact component to the backup power supply contact component. According to the contact arc-extinguishing system, the arc-extinguishing chambers are enabled to obtain maximum arc-extinguishing distance and arc-extinguishing time within the limited volume of the installing box of the dual-power-supply automatic changeover switch so that attenuation of arc energy is facilitated and a better arc extinguishing effect can be obtained; meanwhile, the contact arc-extinguishing system is simple in structure and stable and reliable in work.

A fuse holder for a fuse cutout includes a molded member including a short fuse tube section and a downwardly extending fin member adapted for securing to a trunnion assembly. An arc quenching liner is disposed in the interior of the tube section and a top casting is connected to the top of the fuse holder and adapted to receive and hold an arc flange of an arc sleeve on a top edge, thereby keeping the arc flange above the top casting. A conductive screw cap seals the assembly. The shorter tube and the provision of the arc flange above the top casting provides superior arc quenching properties.

The invention discloses a direct-current vacuum circuit breaker, which comprises a normal current branch, a conversion branch, an energy absorption branch and a magnetic field generating branch. The magnetic field generating branch is formed by sequential series connection of a drive capacitor C1, a repulsion coil L1 and a high-voltage cable L3 wound around an arc extinguishing chamber. A diode D1is parallelly connected to two sides of the L1 and the L3, and a stable and durable longitudinal magnetic field is generated in the arc extinguishing chamber through long-time follow current of the diode D1 by the repulsion coil L1 and the high-voltage cable L3 after discharging of the drive capacitor C1. The direct-current vacuum circuit breaker has advantages that the effective magnetic field can be generated without grooving a contact of the arc extinguishing chamber, contact area increasing, arc energy reduction, circuit breaker switching capacity increasing and the like are achieved, andthe direct-current vacuum circuit breaker is applicable to high-current power systems.

The present disclosure relates to an electrical DC switching system (1) for extinguishing an electric arc, wherein the electrical DC switching system comprises: a contact arrangement (3) having a first contact (3a) and a second contact (3b), a current injection circuit (5) including a resonance circuit configured to be connected across the contact arrangement (3), and a first switch connected to the resonance circuit (6) and to the first contact (3a), wherein the first switch (S1) is configured to be switched between an open state and a closed state, wherein in the closed state the first switch is configured to enable an injection current to flow through the resonance circuit (6) in a first flow direction and into the contact arrangement (3) in a direction opposite to a flow direction of a contact arrangement arc current, and an arc chute assembly (7) comprising a plurality of splitter plates configured to extinguish an electric arc across the first contact (3a) and the second contact (3b), wherein each splitter plate of the plurality of splitter plates has a layered configuration comprising a magnetic layer and two non-magnetic layers.

A series gap arrester, comprising an insulator and a plurality of conductor groups arranged in the gap along the main axis direction of the insulator, the adjacent two groups of conductor groups arranged in the gap in the main axis direction of the insulator are the first conductor group, the second conductor group respectively. Two conductor groups, the first conductor group includes A first conductors, the second conductor group includes B second conductors, A+B≥3, the first conductor group The lengths of all the gas discharge channels formed by a conductor and the second conductors of the second conductor group are equal. It can improve the arc extinguishing effect of the series gap arrester and reduce its leakage current under the condition of taking into account the lightning protection effect.

The invention discloses a capillary dual-channel trigger device for series gaps and its application. The single-gap capillaries are respectively embedded in the corresponding gaps, and are respectively connected to the secondary sides of the pulse transformer through corresponding voltage equalizing capacitors. The pulse transformer The primary side is connected to the DC power supply through the pulse discharge circuit, and the output terminal of the DC power supply is connected in series with the pulse charging circuit. The invention adopts double-channel single-gap capillary discharge, has advanced technology, simple structure, excellent control performance, and can effectively, quickly, accurately and reliably conduct series gaps.

The invention provides a grounding switch contact and a straight movement plug-in type grounding switch with the grounding switch contact. The grounding switch contact comprises a static end contact electrode and a dynamic end contact electrode, wherein the static end contact electrode is fixedly arranged, and the dynamic end contact electrode is movably arranged in the axial direction of the static end contact electrode and has a conduction position at which the dynamic end contact electrode and the static end contact electrode can be embedded to each other and a disconnection position at which the dynamic end contact electrode and the static end contact electrode can be separated from each other. The grounding switch contact further comprises a magnetic control device, and when the dynamic end contact electrode is switched to the conduction position from the disconnection position and generates a pre-breakdown arc, the magnetic control device can generate a transverse magnetic field perpendicular to the pre-breakdown arc or a longitudinal magnetic field parallel to the pre-breakdown arc through the current of the static end contact electrode and the current of the dynamic end contact electrode. Due to the technical scheme, the problem that a straight movement plug-in type grounding switch in the prior art cannot be turned off or on easily at a large current can be effectively solved.

The invention relates to the field of electrical contact materials, in particular to a silver-nickel electrical contact material and a preparation method thereof, which is composed of the following components and their mass percentages are: 8%≤nickel≤30%, 0.5%≤molybdenum carbide≤12 %, the balance being silver. The production process of this silver-nickel electric contact material adopts powder mixing-extrusion process. The present invention mainly considers improving the anti-welding performance of silver-nickel materials, and adds molybdenum carbide as a reinforcing phase. Molybdenum carbide has the advantages of high melting point, good thermal stability, and density similar to silver and nickel, which can be guaranteed by ordinary powder mixing process. Uniformity of ingredients, suitable for mass production. Compared with common silver-nickel materials, the material of the invention has high welding resistance and low arc energy, and is mainly used in AC contactors and relays.

The present disclosure relates to an arc ventilation system of a distributing board, and more particularly, to an arc ventilation system of a distributing board to minimize an arc flowing forward to prevent damage. In the arc ventilation system of a distributing board in which a plurality of compartments are provided, a first compartment accommodating an electric power device which can be drawn inor out, among the plurality of compartments, comprises an arc blocking part blocking a space between the electric power device and the first compartment at an operation position of the electric powerdevice.