118results about How to "Reduced dielectric strength" patented technology

The system consists of fixing the printed circuit board (3) to the bottom (1) of the body of the box with the cooperation of a perimetral and spacing flap (6) which creates a chamber (7) under the board (3), in which the components (4) associated to the lower side of said board are housed, subsequently filling the outer perimetral space of said flap (6) with a resin mass (8), which is applied in liquid state and solidifies immediately afterwards, such that said resin (8) perfectly seals the chamber (7), while at the same time provides a thick protective layer on the upper side of the printed circuit board (3), also protecting the latter, which allows for the cover (2) of the box to have openings for ventilation of certain components (4′) which generate a remarkable amount of heat.

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 HF ignition device for igniting a combustible gas mixture in an internal combustion engine, comprising a center electrode (2), an insulating body (3) through which center electrode (2) extends, a housing (4) that carries, on one end thereof, a metallic housing body (5) that encloses at least one section of insulating body (3), and comprising an external thread (5a) to be screwed into an internal combustion engine, and a circuit for the HF excitation of the center electrode (2). According to the invention, the section of the insulating body (3) that encloses the housing body (5) comprises an electrically conductive coating (6).

An SOI substrate is manufactured by forming an embrittled layer in a bond substrate by increasing the dose of hydrogen ions in the formation of the embrittled layer to a value more than the dose of hydrogen ions of the lower limit for separation of the bond substrate, separating the bond substrate attached to the base substrate, forming an SOI substrate in which a single crystal semiconductor film is formed over the base substrate, and irradiating a surface of the single crystal semiconductor film with laser light.

The invention relates to a preparation method for a cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects. The cable insulating material is composite material prepared by blending 1 to 3 wt% of a microcapsule containing a liquid repairing agent and a low-density polyethylene base material, then adding 0.02 to 0.05 wt% of a Grubbs catalyst, carrying out extrusion with an extruder and then carrying out cooling and drying, wherein the microcapsule containing the liquid repairing agent is a urea-formaldehyde resin-coated dicyclopentadiene nanometer microcapsule. Early-stage electrical-tree defects are repaired through a chemical reaction of the repairing agent with the catalyst imbedded in a substrate, so the dielectric strength of the cable insulating material is prevented from obvious decrease. The material prepared in the invention has the characteristics of simple preparation, high repairing efficiency, capacity of maintaining dielectric strength for a long time, etc., is extensively applicable to electric insulation layers of cables and has effectively improved service life and usage stability.

The invention discloses a mixed powder quasi-dry typed electric spark processing device and a method, which has the advantages of low processing roughness, high precision, good processing stability, quick processing speed and the like. The structure of the electric spark processing device comprises an electric spark processing machine tool; the pipe-shaped tool electrode of the electric spark processing machine tool is connected with a slight lubrication device which is connected with an air compressor.

The invention discloses a box body of a sealing switch cabinet. The box body comprises a front sealing plate, a side sealing plate and a rear sealing plate which are mutually spliced; joints among the sealing plates are filled and sealed with sealant; the front sealing plate is provided with a rotating axial hole; and a sealing ring is arranged on the periphery of the rotating axial hole. The box body of the switch cabinet, which is disclosed by the invention, is of a framework structure formed by steel plates; the framework structure combines and applies a static seal of the box body and a moving seal of the box body to form a sealing box body of the switch cabinet and ensure air not to enter the interior of the box body from the box body joint and the operation rotating shaft hole, wherein the static seal of the box body is formed by filling and sealing a long-effective sealant for a sheet metal box board; and the moving seal of the box body is formed by splicing the sealing ring with the operation rotating axial hole. In addition, a natural ventilation channel groove is arranged in the box body for enabling electrical elements inside the box body to ventilate and radiate heat; meanwhile, an air cleaning device is arranged at an inlet of an air exchange hole so as to ensure that clean air enters the interior of the cabinet and play a role of reducing the temperature in the cabinet; and the cleanness in the cabinet is ensured and the reduction of insulation strength in the cabinet during long-term operation is reduced.

A cable termination housing for terminating a cable to one or more devices includes a bore for receiving a device mating portion, a component portion integrally formed within the housing, the component portion having a fastener that is slidable between a retracted position wherein fastener does not extend into the lug aperture of the cable assembly and an extended position wherein the fastener extends into the lug aperture. Preferably, the fastener is rotatable while in its extended position so as to couple with the device mating portion.

The present invention provides a highly reliable charged beam gun designed in consideration for environmental protection, which prevents faulty insulation in a high-voltage connection. An insulating liquid is present in a gap formed between a connecting bushing and a receiving-side flange placed in a vacuum container, and the connecting bushing includes first piping and valve that provide communication between the gap and atmospheric air, and second piping and valve that provide communication between the gap and the atmospheric air, whereby the gap is cut off from the atmospheric air.

The invention discloses a cabin static contact-free non-SF6 gas insulated isolating switchgear, and belongs to the field of medium-voltage switchgears. For the problems that in the prior art, the non-SF6 gas insulated switchgear is poor in arc extinguishing effect, poor in insulativity and weak in safety, the cabin static contact-free non-SF6 gas insulated isolating switchgear comprises an air chamber, a mechanism chamber, an instrument chamber, a cable chamber, a pressure release chamber and a busbar connector chamber; the air chamber comprises a busbar connector, a circuit breaker, a three-position switch, a busbar, a lead-out bushing and a gas tank which are connected in sequence, the three-position switch, the circuit breaker and the busbar are installed in the closed gas tank, the busbar connector and the lead-out bushing are installed on a gas tank shell, the gas tank is filled with non-SF6 insulating gas, and the circuit breaker is an enclosed type vacuum arc extinguishing circuit breaker. The switchgear is free of maintenance, damage of a severe environment to the insulativity is effectively prevented, and normal and safe operation of the switchgear is guaranteed.

The invention discloses a production method of a silver-plated conductor for producing highly sophisticated products for aviation and aerospace. The production method is characterized by comprising the following production steps: firstly preparing a nickel salt, then preparing a plating solution, insulating a copper or copper alloy conductor, chemically degreasing, washing with water, chemically derusting and polishing, washing with water, carrying out weak etching, washing with water twice, placing into the plating solution for nickel pre-plating, recovering, washing with water, removing the film, washing with water twice, carrying out silver pre-plating and silver plating, recovering, washing with water twice, passivating, washing with water, and drying to obtain the silver-plated conductor. The coating of the silver-plated conductor has the advantages of uniform thickness, high purity, good density, high corrosion resistance and everlasting luster and whiteness; and the silver-plated conductor can be used for highly sophisticated products in aviation, aerospace and other fields.

The invention has for its object to provide, without incurring any cost increase, a thin-film EL device in which a dielectric layer is corrected for non-flat portions to have a smooth surface, thereby ensuring enhanced display quality, and its fabrication process. This object is achieved by the provision of a thin-film EL device having at least a structure comprising an electrically insulating substrate (11), a lower electrode layer (12) stacked on the substrate according to a given pattern, a multilayer dielectric layer (13) formed thereon by repeating a solution coating-and-firing step plural times, and a light-emitting layer (14), a thin-film insulator layer (15) and a transparent electrode layer (16) stacked on the dielectric layer. The multilayer dielectric layer has a thickness of at least four times as large as a thickness of the electrode layer and 4 mum to 16 mum inclusive. The fabrication process is also provided.

The invention discloses an IH electromagnetic cooker. The IH electromagnetic cooker mainly comprises a shell, a cover, an inner container, inductance coils, arranged on the side faces and the lower portion of the inner container, of an electromagnetic heater, a first temperature sensor probe arranged below the inner container, a second temperature sensor probe arranged below the cover, an infrared ray heater arranged below the cover, buttons arranged on the cover, a display arranged on the cover, a computer controller, an electric heating damp-proof mechanism and a power line, wherein the computer controller, the electric heating damp-proof mechanism and the power line are arranged in the shell. The electromagnetic heater is composed of a silicon rectifier stack, a frequency conversion triode, a single board computer, the inductance coils and an electric fan. The upper side face of a lining made of 201 or 202 stainless steel and the upper side face of the shell are separated through insulation materials, the lower side face and the lower face of the lining made of the 201 or 202 stainless steel and the inductance coils of the electromagnetic heater are separated through the insulation materials, and the insulation materials are formed in the mode that a layer of ceramic fiber or glass fiber braided fabric is wrapped inside a layer of fish paper or plastic boards; a small hole in the center of the lining made of the 201 or 202 stainless steel is internally provided with a microswitch and the first temperature sensor probe.

The invention relates to a vertical insulator ratchet fastener for a 10 kV electric power overhead line, and an application method. The vertical insulator ratchet fastener comprises a first buckle clamp, a second buckle clamp, a spring, a lock catch, silica gel loops, a first pin and a second pin, wherein the first buckle clamp and the second buckle clamp are each internally provided with an arc structure, the silica gel loops are fixed on the inner walls of the arc structures, one end of the first buckle clamp and one end of the second buckle clamp are movably hinged to each other through the first pin, the other end of the first buckle clamp is movably hinged to the lock catch through the second pin, the other end of the second buckle clamp is provided with reverse ratchet teeth, and the lock catch is provided with forward ratchet teeth matching the second buckle clamp; the spring is arranged between the lock catch and the first buckle clamp for limiting the position of the lock catch; and the first buckle clamp and an insulator form an integrated structure. The vertical insulator ratchet fastener and the method have the following advantages: the operation of the ratchet fastener is simple and rapid, the work efficiency is improved, the high-altitude operation time of personnel is reduced, the operation safety coefficient is enhanced, and the fastening effect is better; and the ratchet fastener is large in structural strength, is corrosion-resistant and is not affected by such environment factors as wind power, air humidity and the like.

A method for forming a separable electrical connector having an electrical interface surface includes the steps of molding an interface shell from a thermoplastic, placing the interface shell against an electrical interface portion of a mold cavity and molding a housing within the mold cavity. When placed in the mold cavity, the interface shell provides a barrier to the mold cavity interface portion, wherein the housing is isolated from the electrical interface potion of the mold cavity by the interface shell. The shell has an inner surface and an outer surface and the housing is bonded to one of the inner and outer surfaces, wherein the other of the inner and outer surfaces of the shell defines the electrical interface surface of the electrical connector.

A liquid jet apparatus of the invention includes a drive waveform generator that generates a drive waveform signal, a modulator that pulse-modulates the drive waveform signal so as to produce a modulated signal, a digital power amplification circuit that amplifies the power of the modulated signal so as to produce an amplified digital signal, and a low pass filter that smoothes the amplified digital signal so as to produce a drive signal. The digital power amplification circuit includes multiple stages of digital power amplifiers each including a pair of switching elements that are push-pull-connected. The amplified digital signal is a multi-value signal that reaches a larger number of steps of electric potentials than the number of digital power amplifiers.

The invention belongs to the technical field of preparation of microwave ceramics, in particular relates to a pressure control adjustable barium strontium titanate-base compound ceramic material and a preparation method thereof. The compound ceramic material is prepared as follows: Ba(1-x)SrxTiO3 is compounded with Mg(1-y)ZnyO with low dielectric constant and low dielectric loss; little Ta2O5 is added to modify the compound ceramics of (1-m)Ba(1-x)SrxTiO3-mMg(1-y)ZnyO so as to meet the performance requirements of pressure control adjustable microwave ceramics with proper dielectric constant, low microwave dielectric loss, high pressure control adjustability and so on. The barium strontium titanate-base compound ceramic material prepared by adopting the solid reaction process or the coprecipitation coating process is cold isostatic compacted without adding any forming agent and is sintered under atmospheric pressure, thus obtaining high density and high purity ceramic blocks. The pressure control adjustable barium strontium titanate-base compound ceramic material is applicable for such microwave devices as phased array phasers, adjustable filters, delay lines, oscillators, resonators and so on.