174results about How to "Avoid flashover" patented technology

The anti-flashover ring of the present invention includes a substantially cylindrical body having an outer surface with a plurality of passageways thereon. Each of the passageways pass from one of the sidewalls through the body to the other of the sidewalls of the ring. The passageways function to provide fluid communication between the atmosphere surrounding an accessory product such as a bushing insert and the interior of a connector mounted thereon when the connector is being pulled off the bushing insert. The fluid communication prevents a vacuum from forming between the connector and the bushing insert that can lead to a flashover between an electrical probe in the connector and a ground shield of the bushing insert. The anti-flashover ring is also configured to provide an indication to the operator installing the connector of when the connector is fully installed on the bushing insert. Such indication is provided by providing the ring with a width that is equal to length of the lip of the connector when the connector is fully installed. As such, the operator installing the connector continues to push on the connector until the end of the lip aligns with the end of the ring.

A flame-retardant wick holder for a candle is made of a material having a UL-94 vertical burn test rating of at least V-0, including polymers and ceramics. The wick holder supports a wick at the bottom of a candle. The wick holder material causes the flame on the wick to extinguish when it reaches the holder, thereby preventing flashover of the residual candle fuel at the end of the candle useful life. One version of the holder has a cylindrical sleeve fit over a wick clip holding the lower end of the wick. The cylindrical holder is well adapted for use in pillar-type candles.

The invention relates to a lightning protection and especially relates to a 10-35kV overhead transmission line constraint space injection gas arc extinguishing lightning protection gap apparatus which is suitable for a 10-35kV overhead transmission line. The apparatus is installed in parallel on two ends of a line insulator string to protect a flash-over voltage between gaps to be less than the voltage of a protected insulator string so that the apparatus is punctured prior to the protected insulator string when the power transmission line is suffered from lightning stroke. During disruptive discharging, a signal acquisition device automatically senses a lightning current signal and triggers a high speed injection gas generation apparatus. A high speed injection air flow is instantly generated so as to carry out great impact on a follow current arc in a constraint space along a vertical direction, and carry out cooling till the arc is quenched. According to the invention, a structure is simple, installation and maintenance are convenient. Through using the apparatus of the invention, when the line is suffered from the lightning stroke, a lightning current can be rapidly led to the ground and simultaneously a high speed airflow quenching power frequency follow current is generated so that electric equipment can be effectively protected and power supply reliability is increased.

The invention relates to a corona ignitor device configured to be fixed within a combustion chamber, including a housing extending between an upper end and a lower end of the ignitor device. Inductor windings are received in the housing between the upper and lower ends, and a magnetic shield located between the housing and the inductor windings prevent magnetic flux from emanating out of the ignitor device.

Loadbreak connectors which are modified to reduce the probability of flashover upon disassembly operation of a loadbreak bushing insert from a power cable elbow connector. The bushing insert is provided with vents to vent a cavity formed between the elbow cuff and the transition shoulder portion of the bushing insert with ambient air to avoid a decrease in pressure within the connection region and avoid a decrease in the dielectric strength of the air therein thus preventing flashover. The vents can be provided directly on the transition shoulder portion of the insert, an elbow seating indicator band or on a bushing insert interface shell. Additionally, the band and the shell may be formed of a bright contrasting color which serves to indicate whether the loadbreak connector is improperly assembled. The shell further reduces friction upon assembly of the connector.

The invention relates to an electric strength inspection device for oil paper compound insulation oil during flowing, belongs to the technical field of high voltage and insulation, and aims at solving the problems of difficulty in mounting and frequent flashover caused by processing errors of the existing electric strength inspection devices. The electric strength inspection device comprises a high-voltage bushing, a lower connecting piece of the high-voltage bushing, an upper electrode connecting piece, an upper electrode, an upper electrode insulating member, a lower electrode insulating member, an insulating screw rod, an insulating nut, a lower electrode, an insulating paper board, an oil duct, an earthing bolt, an oil inlet, an oil outlet, an oil inlet connecting piece and an oil outlet connecting piece, wherein the low connecting piece of the high-voltage bushing, the upper electrode connecting piece, the upper electrode, the upper electrode insulating member, the lower electrode insulating member, the insulating screw rod, the insulating nut, the lower electrode, the insulating paper board, the oil duct and the earthing bolt are arranged in a high-voltage test box, the upper electrode is arranged right above the lower electrode and is embedded in the upper electrode insulating member, the lower electrode is embedded in the lower electrode insulating member, and the upper electrode insulating member is arranged above the lower electrode insulating member.

The invention relates to a heatproof antifouling superhigh voltage insulation material and a preparation method thereof. The material contains the components, by weight, 100 portions of low density polyethylene, 15-20 portions of fluorine silicon resin, 20-30 portions of polytetrafluoroethylene, 5-15 portions of a room temperature vulcanized silicone rubber, 1-5 portions of nano montmorillonite, 0.1-1 portion of sodium dodecyl sulfate, 10-30 portions of distilled water, 5-15 portions of a mixture of nano boron nitride, nano magnesium oxide and nano zinc oxide, 0.8-6 portions of a compatible agent, 1-5 portions of a flame retardant, 0.5-2.5 portions of an antioxidant, and 0.5-5 portions of a crosslinking agent. The heatproof antifouling superhigh voltage insulation material prepared by the invention can effectively restrain space charge accumulation in the cable insulation material, and has the advantages of good mechanical, electrical, thermal and physical properties.

A partial discharge detection test link and system is disclosed to detect partial discharge of a power cable accessory. The power cable accessory includes a first accessory component and a second accessory component connected to each other. The partial discharge detection test link is a permanent or temporary substitute for a conventional service link, connects directly across the power cable accessory and includes a conductor member and a partial discharge sensor. The conductor member has an electrically conductive element and an insulation surrounding and extending along the electrically conductive element. The electrically conductive element is electrically connected directly between the first and second accessory components. The partial discharge sensor is disposed about the conductor member and has the electrically conductive element as a primary winding and a secondary winding with the insulation positioned between the primary and secondary windings.

A Coriolis mass flowmeter in which common or even great forces for oscillation excitation can be guaranteed, and at the same time, with which the risk of flashover is reduced in explosion-proof surroundings is implemented in that the actuator assembly (4) has at least a first conductor (11) with windings (12) and at least a second conductor (13) with windings (14), the windings of the conductors being arranged parallel to one another. Also, the first conductor (11) and the second conductor (13) are insulated from one another at least in the area of their windings (12, 14) and the first conductor (11) and the second conductor (13) are connected in such a manner that the first conductor (11) and the second conductor (13) can be supplied with a current in the same manner in the operating state so that a common magnetic field is created.

The invention discloses an electrode device for measuring the electrical strength of a composite insulator silicon rubber umbrella skirt and a measuring method.The electrode device is characterized by comprising an upper plate, an upper electrode fixed with the upper plate through a bolt, a middle support plate, a lower plate and a lower electrode fixed with the lower plate through a bolt, and the vertical height of the middle support plate and the vertical height of the upper plate are adjustable.In the use process, the height of the upper surface of the middle support plate is adjusted to be flush with the upper end of the lower electrode, a silicon rubber sample wafer is put on the middle support plate, and then the position of the upper electrode is adjusted according to the thickness of the silicon rubber sample wafer to enable the electrodes to directly make tight contact with the sample wafer.In the measuring process, the measuring device is immersed in a container filled with transformer oil, a breakdown voltage value of the silicon rubber sample wafer is measured through a voltage measuring instrument, and therefore the electrical strength of the silicon rubber umbrella skirt is obtained.The electrode device is simple in structure, convenient to install, easy to maintain, convenient and rapid in use method and capable of accurately measuring the electrical strength of the composite insulator silicon rubber umbrella skirt.

An electrical connector element for connection of a conductor to a circuit board, having a housing, at least one clamp connector for the conductor and at least two connector pins for preferably soldered connection to the circuit board, is disclosed. The housing has at least one separating element made from insulating material, projecting from the lower side, facing away from the circuit board in the assembled position, at least partly arranged between the connector pins and extending through the circuit board in the assembled position, in order to permit the connector pins of the electrical connector element to be arranged closer together.

A spark plug comprising an insulator, on at least a part of a surface of the insulator being formed a marking layer and a glaze layer, wherein the marking layer is exposed on the surface of the insulator and contains: a Pb component of not more ton 5% by mole in terms of PbO; an Si component of from 36% by mole to 72% by mole in tens of SiO2; an Al component of from 0.1% by mole to 18% by mole in terms of Al2O3; an alkali metal component containing at least one of an Li component, an Na component and a K component of from 0.1% by mole to 9% by mole in terms of Li2O, Na2O and K2O, respectively; a B component of from 3% by mole to 30% by mole in terms of B2O3; and a color developing component containing at least one of a V component, a Cr component, an Mn component, an Fe component, a Co component, an Ni component, a Cu component, a Pr component, an Nd component, an Au component, a Cd component, an Sn component, an Sb component, an Se component, an S component and an La component of more than 0% by mole but not more than 50% by mole in terms of V2O5, Cr2O3, MnO2, Fe2O3, CoO, NiO, CuO, Pr2O3, Nd2O3, Au2O3, Cd2O3, SnO2, Sb2O5, SeO2, SO3 and La2O3, respectively.

The invention provides a drawing method of float-zone silicon single crystals. The method comprises the following steps: charging; smelting materials; introducing crystals; growing thin neck; shouldering; constant-diameter growing; ending; cooling; dismounting the furnace; and the like. The method specifically comprises the following steps: before heating polycrystalline silicon, filling a mixed gas of argon and nitrogen in a float-zone furnace, wherein the volume ratio of nitrogen and argon is 0.05%-20%; and after ending, stopping filling argon and nitrogen. According to the drawing method provided by the invention, the production cost of silicon single crystals is lowered while spark breakdown of a coil caused by gas ionization at a high temperature is effectively prevented. Nitrogen atoms can reduce the defect density of the float-zone silicon single crystals, and dislocation movement in pinning crystals can enhance the mechanical strength of the float-zone silicon single crystals, so that the performance of subsequent apparatuses is improved. Silicon single crystals with different mechanical performances can be obtained by adjusting the proportion of argon, so that expansion of application range and field of the silicon single crystals is facilitated.

The invention relates to an electrostatic dust collector, belonging to the technical field of electrostatic dust collection. The dust collector comprises a housing, a cathode and an anode made of electric conductive wires are arranged in the housing, and a dust collection board which is parallel with the anode and whose length is basically equal to that of the anode is arranged close to the anode; the dust collection board semi-surrounds the anode from one side of the anode, the scope of the distance between the dust collection board and the anode is 5-150mm, and the upper end and the lower end of the dust collection board are respectively and fixedly arranged on the upper end and the lower end of the housing through an insulator; and the overall insulator is of an umbrella shape or a dumbbell shape. According to the electrostatic dust collector, the dust collection efficiency is high, various specific resistance dusts can be collected, and any modulation is not needed.

The invention discloses a preparation method of a high-gradient zinc oxide piezoresistor high-resistance layer with the high through-flow capacity. According to the method, a blank body and the high-resistance layer are included. The high-resistance layer wraps the blank body. The high-resistance layer is prepared from ZnO, Fe2O3, Bi2O3, Sb2O3, SiO2, MnO2, Li2CO3 and Ni2O3. The blank body is the zinc oxide piezoresistor blank body and is prepared from ZnO, Fe2O3, Bi2O3, Sb2O3, SiO2, MnO2, Li2CO3 and Ni2O3. The method has the advantages that the mechanical strength of a piezoresistor is improved, the phenomena of cracking and flashover are avoided, the dielectric strength of the side face of the piezoresistor body can be improved, and the through-flow area of the body is not affected.

An arc splitter arrangement for an electrical switch comprises at least two arc splitters composed of a ferromagnetic material disposed parallel to one another, wherein each of the at least two arc splitters has a V-shaped cutout on a narrow face edge forming an inlet area for an arc, and an insulating material at least partially coating at least one side of the arc splitter, wherein the at least one side includes an area located behind the inlet area in an arc running direction, the area being free of, and surrounded by, the insulating material. A service switching device comprises at least one arc splitter arrangement.

The invention discloses a light guide self-adaptive narrow-spectrum microwave generation method based on high-energy pulse cluster laser, and aims to solve the problems of large size of a microwave generation device, single frequency point and difficult frequency modulation in an existing microwave generation method. According to the technical scheme, a light guide self-adaptive narrow-spectrum microwave generator composed of a high-energy pulse cluster laser device, a voltage source, a wide-band gap semiconductor device and a radiation output assembly is constructed firstly; the high-energy pulse cluster laser device outputs the high-energy pulse cluster laser adjustable in pulse cluster repetition frequency, pulse width, envelope waveform and GHz high-frequency pulse repetition frequency to the wide-band gap semiconductor device; the voltage source is a solid-state pulse forming line, and generates a pulse voltage to act on the wide-band gap semiconductor device; the wide-band gap semiconductor device generates a high-frequency electric signal under the simultaneous action of the laser and the voltage; and the radiation output assembly is used for radiating the high-frequency electric signal and outputting a microwave signal. By adopting the method, the problems of large size of the microwave generation device, single frequency point and difficult frequency modulation can be solved.