124results about How to "Avoid partial discharge" patented technology

The invention relates to an ionization device, in particular to a ring dielectric barrier discharge ionization device, which comprises an insulating medium cavity, discharge electrodes, a repeller electrode, an insulating medium and a power supply, wherein one end of the insulating medium cavity is open, and the other end of the insulating medium cavity is closed; a gas inlet is formed in a sidewall close to the closed end of the insulating medium cavity; the discharge electrodes are ring electrodes which form a group, closely surround the periphery of the middle part of the insulating medium cavity, and are clad by the insulating medium; the repeller electrode is a circular metal plate, and is arranged in the closed end of the insulating medium cavity and positioned above the discharge electrodes; and the power supply supplies power to the discharge electrodes. The ring dielectric barrier discharge ionization device has the characteristics of discharge stability, no electrode pollution, oxidation resistance, low power consumption, long service life, wide working air pressure range and the like, and can be widely applied in the fields of mass spectrometric ionization sources, plasma treatment, material preparation and the like.

The invention relates to a test method of a bonding strength of a composite insulator. The composite insulator comprises a core rod, a jacket which is arranged outside the core rod and an umbrella skirt which is arranged outside the jacket. The method is suitable for testing the bonding strength between the composite insulator jacket and the core rod and testing the bonding strength between the composite insulator umbrella skirt and the jacket. The method comprises the following steps: selecting a composite insulator jacket sample or samples of composite insulator umbrella skit and jacket; applying a pull force to the sample by virtue of a pull force device; determining the bonding strength when the sample is stripped by the pull force; and judging the bonding strength of the sample. The method is used for detecting and verifying the overall sealing performance of the composite insulator as well as detecting whether the junction of the insulator umbrella skirt is fractured or not and whether the bonding strength is smaller than the pull-apart strength of the umbrella skirt material.

The invention relates to a circular shielding insulating bus, which has the advantages of high carrying capacity, good heat dissipation, low temperature rise, strong electric insulation performance, no environmental disturbance and high reliability. The circular shielding insulating bus comprises a circular conductor and an outer layer sheath, wherein a plurality of insulating shielding layers are arranged between the circular conductor and the outer layer sheath and consist of insulating layers and shielding layers; each insulating layer comprises two polytetrafluoroethylene layers and a thermal shrinkage sheath from inside to outside; and silicone oil is uniformly brushed between the polytetrafluoroethylene and the thermal shrinkage sheath.

The invention provides a medium space charge measurement electrode at AC superposition DC voltage based on a PEA method, belongs to the field of high voltage and insulation, and aims to solve a problem of measuring space charge distribution of flat-shaped solid insulation materials at AC superposition DC voltage based on the PEA method. The medium space charge measurement electrode at AC superposition DC voltage based on the PEA method comprises an upper electrode, a lower electrode, an electrode fastener, an AC superposition DC power supply, a nanosecond pulse power supply, a sample and a signal amplifier. The sample is positioned at the center of an upper surface of the lower electrode, the upper electrode is positioned above the sample, the upper electrode is not contacted with the lower electrode, the upper electrode and the lower electrode are fastened through the electrode fastener, the AC superposition DC power supply is electrically connected with the upper electrode, and the signal amplifier is fixed in the lower electrode. The invention is used for measuring space charge distribution of flat-shaped solid insulation materials at AC superposition DC voltage based on the PEA method and is mainly applied to the field of high voltage and insulation.

The invention discloses a three-layer coextruded preformed 10-35KV insulating tubular bus and a manufacturing method thereof. The section structure of the tubular bus has four layers, namely a metal tube conductor layer, a three-layer coextruded heat-shrinkage bush layer, a metal grounding shielding layer and an outer protective jacket layer in sequence from inside to outside. The present application provides a preformed product of the 10-35KV insulating tubular bus, which breaks through the traditional technology of processing the tubular bus by adopting polytetrafluoroethylene lapping or a heat-shrinkage multilayer bush. The 10-35KV insulating tubular bus has the characteristics that the three-layer coextruded heat-shrinkage bush formed by single coextrusion can be well jointed with a metal conductor tube without a clearance, so that a phenomenon of expansion with heat and contraction with cold due to the influence of cold and hot environments is eliminated, and interference of electric fields and magnetic fields of other tubular buses is avoided; meanwhile, the production process of the present application is simple and feasible, the manpower and the labor intensity are reduced, the product quality is not influenced by human factors, the production efficiency and the yield are greatly improved, the cost is lowered, and comprehensive competitiveness are increased for enterprises.

The invention provides a semi-conductive polyolefin shielding material for a high-voltage direct-current cable. The semi-conductive polyolefin shielding material comprises the following components in parts by mass: 100 parts of LDPE (low-density polyethylene), 1-2 parts of CPE (chlorinated polyethylene), 0.5-1.5 parts of BaTiO3, 8-15 parts of conductive potassium titanate whisker, 0.2-0.6 parts of stearic acid, 1-2.5 parts of cross-linking agent and 0.1-0.5 part of antioxidant. The semi-conductive polyolefin shielding material prepared from the components has the characteristic of ultra-smooth surface, and is good in physical performance and excellent in comprehensive performance. The current can be effectively conducted, a good effect of homogenizing an electric field is achieved, and the problem of partial discharge or insulation breakdown caused by serious electric field concentration probably brought by the surface defect of a semi-conductive shielding layer is solved. By attracting an ionized charge and an injected charge into a deep trap, the charges are prevented from being accumulated in a partial area, so that space charge accumulation in a cable insulation material is suppressed, and the electric conductivity of the cable insulation material is reduced.

The invention relates to a semi-conductive shielding material for a 10-220kV electric cable and a preparation method. The semi-conductive shielding material has the advantages of non-crosslinking property, high temperature-resistant class, low volume resistivity, non pollution and recycling property. Polypropylene resin which is used as a substrate is mixed with conductive carbon black which is used as a conductive medium to form the non-crosslinking semi-conductive shielding material, of which the volume resistivity shall be no more than 10ohm.cm at the temperature of 20 DEG C, and shall be no more than 20ohm.cm at the temperature of 90 DEG C. The semi-conductive shielding material has the beneficial effects that the conductive property and heat stability of the shielding material are improved; because the polypropylene resin has good mechanical property and high temperature-resistant class, the polypropylene resin can work in the environment at the temperature of -20 to 95 DEG C for a long time under the condition of no crosslinking; for the semi-conductive shielding materials for medium, high and ultrahigh-voltage electric cables, the characteristics of high temperature-resistant property, non-crosslinking, environment-friendly and recycling properties, low resistance and heat stability are realized; when the semi-conductive shielding material is applied to the electric cable products, the electric field equalizing effect is improved, the local discharge is prevented, the reliability in running of electric cables is improved, and the service life is prolonged.

The invention provides a module flow balancing water channel used for a direct current converter valve. The water channel comprises a water inlet pipe, a water outlet pipe, saturable reactors, thyristor radiators, damping resistors and a water distribution connecting pipeline. A water channel circuit is composed of a thyristor radiator and damping resistor branch circuit and saturable reactor branch circuits, wherein the thyristor radiator and damping resistor branch circuit and the saturable reactor branch circuits are arranged in a mode with parallel connection and series connection mixed. The water inlet pipe and the water outlet pipe are arranged in parallel, a diagonal water inlet and outlet method is adopted, the thyristor radiators and the damping resistors are connected in series to form a branch circuit which is connected between the water inlet pipe and the water outlet pipe in parallel, and the saturable reactor branch circuits are arranged between the head end of the water inlet pipe and the tail end of the water outlet pipe and between the tail end of the water inlet pipe and the head end of the water outlet pipe respectively. Compared with the prior art, the module flow balancing water channel used for the direct current converter valve has the advantages that flow distribution is even, temperature distribution of thyristors is even, no flow dead zone exists in the water channel, and partial discharge caused by deposition of air and impurities is avoided.

The invention relates to a power cable for an underwater shovel arm of a dredger and a manufacturing method thereof. A cable core comprises three main wire cores and three ground wire cores, which are mutually stranded, wherein the main wire cores and the ground wire cores are evenly arranged along the same circumference in a and staggered manner; the center of the cable core is provided with a rubber saddle-shaped fixed mount, and the center of the rubber saddle-shaped fixed mount is provided with tensile cores; the center of each main wire core is a main wire core conductor, the periphery of the main wire core conductor is wrapped by a main wire core halogen free belt in a winding manner, the periphery of the main wire core halogen free belt is extruded and wrapped by a main wire core insulating layer, and the periphery of the main wire core insulating layer is wrapped by a main wire core semiconductor electrically-scraping rubber belt in a winding manner; the center of each ground wire core is a ground wire core conductor, the periphery of the ground wire core conductor is extruded and wrapped by a ground wire core insulating layer, and the periphery of the ground wire core insulating layer is wrapped by a ground wire core semiconductor electrically-scraping rubber belt in a winding manner; and the periphery of the cable core is extruded and wrapped by two layers of chlorosulfonated polyethylene rubber sheaths, and the circumference between the two layers of rubber sheaths is longitudinally wrapped by soft fiber paper. The power cable has the advantages of stable structure, reliable insulation, high tensile strength and aging resistance, and is easy to bend.

A soldering portion (4) and a Ni plating mark (5) are simultaneously forming by plating on a wiring pattern (2) of an insulating substrate (1). A semiconductor chip (6) is mounted on the insulating substrate (1). A position of the insulating substrate (1) is recognized by the Ni plating mark (5) and a wire (7) is bonded to the semiconductor chip (6). An electrode (8) is joined to the soldering portion (4) by solder (9). The insulating substrate (1), the semiconductor chip (6), the wire (7), and the electrode (8) are encapsulated in an encapsulation material (13).

The invention discloses a sealing device and a condensing unit of an evaporative cooling asynchronous motor stator and manufacturing methods thereof. The stator comprises a stator core and a stator winding which are mutual connected. The sealing device comprises a sleeve, two cavity side walls and two cavity connecting walls, wherein the sleeve is connected to an inner circle surface of the stator core; the outer edges of each cavity side wall are connected to an enclosure of an asynchronous motor in a seal mode; the outer ends of each cavity connecting wall are connected to the cavity side walls, and the inner ends of each cavity connecting wall are connected with the stator core along with the bending shape of an end part of the stator winding; and the sleeve, the two cavity side walls,the two cavity connecting walls and the enclosure form a stator seal cavity. In the invention, the unnecessary end part space is eliminated, so that the volume of the stator seal cavity is reduced, thus cooling medium liquids in the stator seal cavity are distributed reasonably, and the usage amount of the cooling medium is reduced therewith, thereby remarkably reducing the manufacturing cost of an evaporative cooling asynchronous motor, and improving the market competitiveness.

The invention discloses extruded composite smooth aluminum sleeve cable production equipment and a production method. The production equipment comprises an extruded aluminum sleeve device, a wheel type reducing device, a preheating device, a multi-layer co-extrusion device and a cooling water tank, and the extruded aluminum sleeve device continuously extrudes an aluminum sleeve; the cable coated with the aluminum sleeve passes through a shaft hole, and the aluminum sleeve is tightened to the outer diameter designed by the process by the wheel type reducing device, so that the whole aluminum sleeve is coated on the surface of the cable core; the preheating device is used for heating the aluminum sleeve; the multi-layer co-extrusion device is used for compounding the aluminum sleeve with thehot melt adhesive, a PE sheath, a PVC sheath and a conductive layer together and carrying out cooling molding through the cooling water tank. According to the hot melt adhesive extrusion technology designed by the invention, the hot melt adhesive not only achieves an anti-corrosion effect, but also achieves a bonding effect, so that the PE sheath, the PVC sheath, the conductive layer and the smooth aluminum sheath of the cable are firmly bonded together, and the phenomena of arching or wrinkling cannot be generated during bending, take-up and construction of the cable.

A spark plug has a center electrode disposed inside an insulator, and a housing that at least locally surrounds the insulator, and a conductive planar element that is electrically contacted to the housing is disposed on the insulator.

The invention discloses a hot melt adhesive coating device and coating method for composite smooth aluminum sheathed high-voltage cables. The coating device comprises an argon arc welding production line and a plastic extruding machine, wherein the argon arc welding production line comprises a welding gun part and a traction part; the coating device further comprises a first hot melt adhesive coating device and a second hot melt adhesive coating device; the first hot melt adhesive coating device is arranged between the welding gun part and the traction part; the first hot melt adhesive coatingdevice comprises a hot melt adhesive groove, an adhesive blocking die, a drawing die and an electric heating temperature control assembly; the hot melt adhesive groove is filled with hot melt adhesive particles; the hot melt adhesive particles are heated by the electric heating temperature control assembly to become liquid and completely immerse an aluminum sheath; the aluminum sheath enters thefirst hot melt adhesive coating device and is subjected to primary hot melt adhesive coating while being subjected to a drawing process; and the second hot melt adhesive coating device is arranged atthe front side of the inlet of the plastic extruding machine and is structurally similar to the first hot melt adhesive coating device. According to the hot melt adhesive coating device and coating method for the composite smooth aluminum sheathed high-voltage cables of the invention, secondary hot melt adhesive coating is performed in front of the plastic extruding machine, and therefore, the smooth aluminum sheath and an outer sheath are tightly integrated into a whole, and the phenomena of arching or wrinkling can be avoided during cable bending, take-up and construction.

The invention discloses a magnetic valve controllable reactor, which comprises an outer insulating barrel. An upper end cover part is arranged at the upper end of the outer insulating barrel, and the lower end of the outer insulating barrel is connected with a lower end cover part. The upper end cover part comprises a high-voltage terminal of the reactor and an upper end cover, and the lower end cover part comprises a low-voltage terminal of the reactor, a pulse control line terminal and a lower end cover. A reactor main body is fixed on the inner surface of the lower end cover. A main winding of the reactor is connected with the high-voltage terminal and low-voltage terminal of the reactor respectively. An insulating bracket is arranged at the upper end of a reactor core. A thyristor component and a pulse transformer are arranged on the insulating bracket, and are connected with each other. The pulse transformer is connected with the pulse control line terminal. The invention has the advantages that: the magnetic valve controllable reactor is simple in manufacturing process, low in cost and loss, small in harmonics and wide in voltage application range, and has application potential of improving the transmission capability, regulating the voltage of a power grid, compensating reactive power and limiting over-voltage.

The invention relates to a outdoor bushing for connecting an air-insulated high-voltage conductor to components in a grounded housing enclosed by gas, comprising fixing elements for mounting the outdoor bushing on the housing in a gas-tight manner and an open-air connection for connecting the high voltage conductor, said connection being attached to the fixing elements in a gas-tight manner by means of a hollow insulator. In the latter, electroconductive connection elements extend between the open-air connection and an internal connection for connecting the components. The aim of the invention is to provide an outdoor bushing of this type, which offers other functions in addition to the connection of an air-insulated high-voltage conductor to the protective-gas insulated atmosphere of a grounded housing, by means of its connection elements. To achieve this, said connection elements comprise a disconnecting switch.

The invention discloses an environment-friendly medium-voltage fire-resistant power cable. The environment-friendly medium-voltage fire-resistant power cable comprises a plurality of conductors, wherein each conductor comprises a conductive wire located in the middle, a conductor semi-conductive shielding layer is wrapped on each conductive wire, an insulating layer is wrapped on each conductor semi-conductive shielding layer, an insulating semi-conductive shielding layer is wrapped on each insulating layer, and a metal shielding layer is wrapped on each insulating semi-conductive shielding layer; the conductors constitute a cable core, a ceramic fiber band thermal insulation layer is wound around the cable core, an extruded polyether-ether-ketone fire-proof layer is wrapped on the ceramic fiber band thermal insulation layer, a sheath layer is wrapped on the polyether-ether-ketone fire-proof layer, and the sheath layer is made of a low-smoke zero-halogen flame-retardant high-intensity abrasion-resistant elastic body. The environment-friendly medium-voltage fire-resistant power cable is excellent in high current-carrying and fire-resistant performance, and suitable for being used in a medium-voltage power distribution system for a long time.

The invention provides a capacitance-resistance module and a voltage divider including the capacitance-resistance module, and aims at solving the problem that resistive and capacitive components need to be high in processing precision due to the fact that both the resistive and capacitive components need to be fixedly connected to an installing plate. The capacitance-resistance module comprises at least two conductors arranged separately, resistive and capacitive components are arranged between two adjacent conductors, and at least one end of at least one of the resistive and capacitive components is connected to the corresponding conductor via a sleeve electric-connection structure. The length of at least one of the resistive and capacitive components can vary within certain range, the sleeve electric-connection structure can make up the not high processing precision of the at least one resistive and capacitive component, the resistive and capacitive components can keep a conductive connection state with the corresponding conductors, and the requirement for the processing precision of the resistive and capacitive components is lowered.

The invention provides a temperature measurement optical fiber adaption module and a transformer with the temperature measurement optical fiber adaption module and aims to solve the problems that an optical fiber structure for an existing oil-immersed transformer is poor in sealing performance, cannot be repeatedly plugged and unplugged for use and is low in coupling efficiency are solved. The adaption module comprises a through flange, a coupling joint, two waterproof joints and an adaption optical fiber assembly; the through flange comprises a flange plate, an inner side threaded connector and an outer side threaded connector; the coupling joint is in threaded connection with the inner side threaded connector; the adaption optical fiber assembly comprises a second optical fiber joint, an insertion core, an adaption optical fiber, a second optical fiber inner sheath and a second optical fiber outer sheath; one end of the second optical fiber outer sheath is connected with the second optical fiber joint, and the other end of the second optical fiber outer sheath is arranged in the outer threaded connector; one of the waterproof joints is in threaded connection with the outer side threaded connector; one end of the insertion core is inserted into the coupling joint and is glued with the coupling joint, and the other end of the insertion core is connected with the second optical fiber inner sheath. and one end of the adaption optical fiber is connected with a thermometer, the other end of the adaption optical fiber is inserted in the insertion core and is glued to the insertion core;.