30results about How to "Suppression of partial discharge" patented technology

A semiconductor device in which electrodes of a plurality of semiconductor elements are bonded onto at least one of a plurality of electrode patterns on an insulator substrate, the other surface of the insulator substrate being bonded to a heat dissipating base. The upper surface of the heat dissipating base is covered with a member for cutting off the semiconductor elements from the outer environment. Terminals electrically connect the electrodes on said insulator substrate and the electrode placed outside the cutoff member. The material of the heat dissipating base has a linear expanding coefficient larger than that of the semiconductor element and smaller than three times that of the semiconductor element, and a thermal conductivity larger than 100 W / mK. The semiconductor elements are arranged on at least one electrode surface and in at least two regions divided by the other electrode surface on the insulator substrate.

A vacuum insulated switchgear having a vacuum container, a fixed contact disposed in the vacuum container, a movable contact disposed in the vacuum container capable of being in contact with or out of contact with the fixed contact, a driving mechanism for driving the movable contact in directions to contact with and out of contact with the fixed contact, a resin portion molded around the vacuum container, an insulative bushing for covering a pulled-out portion of a conductor connected to the fixed contact and for extending from the molded resin portion, and a cable head insulating member for covering a conductor of a cable head connected to the conductor at the pulled-out portion and an outer surface of the cable head insulating member being earthed, characterized in that:an earthed conductive member is embedded at least at a position opposite to an end of the cable head insulating member in the bushing.

The invention discloses a manufacture method of a solid insulating circuit device, which comprises the steps of: cleaning the surface of an electric conductor of a circuit device, preheating and then placing into a heated mould, and injecting a liquid epoxy resin composite material composed of silicon micropowder, epoxy resin and a curing agent into the mould; and taking a molded solid insulating circuit device blank from the mould after the epoxy resin composite material in the mould is cured, placing the blank into a baking oven for post-curing treatment, then carrying out sand blasting treatment on the surface of the blank except the part of the interface of the electric conductor to be insulated, coating a layer of conductive coating, carrying out evaporation treatment in the air, and then carrying out curing treatment in the baking oven to complete the manufacture of the solid insulating circuit device. Compared with the prior art, the invention can be used for effectively decreasing partial discharge values inside the solid insulating circuit device and surface inductive voltage of a product.

The invention discloses a + / -660 kV direct-current composite insulator which comprises an annular metal connecting piece located at the end, a sealing ring, an epoxy resin glass fiber stick, a sheath and grading rings. The annular metal connecting piece is connected with the grading ring at the grounding end. The grading ring at the grounding end is connected with the front end of the epoxy resin glass fiber stick through the sealing ring. The outer surface of the epoxy resin glass fiber stick is wrapped by the sheath. Umbrella skirts of three specifications are arranged on the sheath. The tail end of the epoxy resin glass fiber stick is connected with the grading ring at the high-voltage end. According to the + / -660 kV direct-current composite insulator, the structural mode of one large umbrella and two small umbrellas of an extra-large umbrella with arranged flowers is adopted, the creepage distance is effectively increased on the basis of an existing structural height, the electric field distribution of the surface of the + / -660 kV direct-current composite insulator is improved, the local field intensity is reduced, partial discharge is restrained, meanwhile, ice and snow bridge connection can be blocked due to the structure, and the + / -660 kV direct-current composite insulator has the good ice, snow and lightning prevention capacity.

The present invention provides a high voltage isolation transformer, comprising one or more sub-transformers; when the sub-transformer is provided with one, the high voltage isolation transformer is equivalent to the sub-transformer; when multiple sub-transformers are provided, the plurality of sub-transformers are connected in a cascade form, and each sub-transformer is connected in parallel withan equalizing device. The high voltage isolation transformer provided by the invention avoids the situation that partial discharge is difficult to control, the voltage level can be extended to hundreds of kilovolts and above, heat dissipation of windings is facilitated, effective insulation isolation of the compact space can be realized, and the difficulty of transformer insulation design and manufacturing process difficulty and volume can be effectively reduced. The high voltage isolation transformer in the invention has high insulation tolerance strength and low field strength distribution,simultaneously, effective suppression of the partial discharge can be realized, low partial discharge design of the transformer is realized, and the magnitude of partial discharge in the voltage level above hundred kilovolts does not exceed 50pC. The high voltage isolation transformer has the advantages of small structural size, high mechanical strength and flexible installation.

The invention provides a high-power high-voltage high-frequency transformer. The transformer comprises an insulating partition plate; a primary winding and a secondary winding which are respectively arranged on two sides of the insulating partition plate, wherein the primary winding and the secondary winding are spirally coiled according to a plane to form a wire cake, and an inner hole is formedin the center of the wire cake; and primary and secondary side magnetic cores which are arranged in inner holes of the primary and secondary side windings; the primary side magnetic core is fixed in the primary side shielding case, the secondary side magnetic core is fixed in the secondary side shielding case, and the primary side shielding case and the secondary side shielding case enable the whole high-power high-voltage high-frequency transformer to be flat. Therefore, the transformer is in an ultra-thin flat shape, thermal resistance can be reduced, voltage resistance and creepage distanceare guaranteed, insulating materials are saved, due to the flat shape, the distance between the shielding covers on the two sides is small, the plane is large, the uniformity of an internal electricfield is good, no partial discharge can be achieved, and the insulating plate is arranged between the primary winding and the secondary winding. The primary side and the secondary side of the transformer can be completely isolated, and high-voltage isolation is achieved.

Provided is a technique capable of preventing occurrence of partial discharge. An evaluation apparatus includes a probe disposed on an undersurface of an upper component; a sidewall part disposed on the undersurface of the upper component and enclosing sides of the probe; and a first gas supplying part. The first gas supplying part is capable of supplying a gas to a to-be-measured object that is placed on a stage when the sidewall part comes in proximity to the stage, and to a space enclosed by the stage, the sidewall part, and the upper component when the sidewall part is in contact with thestage.

The invention discloses an electrostatic probe-based GIL insulator surface charge on-line monitoring system, which comprises an electrostatic probe; the electrostatic probe comprises three fan-ring-shaped red copper electrodes uniformly distributed along the circumferential direction of the electrostatic probe, fan-ring-shaped epoxy insulators are fixed between the fan-ring-shaped red copper electrodes, and the epoxy insulators are fixedly connected with an insulator; the fan-ring-shaped red copper electrodes are connected with resistance voltage dividing arms, the resistance voltage dividingarms are electrically connected with operational amplifiers, and the operational amplifiers are electrically connected with induction potential data acquisition devices used for detecting the fan-ring-shaped red copper electrodes. The electrostatic probe is pre-installed near a ground electrode of a GIL insulator, probe induction voltage is stored in real time through the data acquisition system,and the surface charge accumulation condition can be monitored in real time; the electrostatic probe measures surface charges in a non-contact manner, the original surface charge distribution is not damaged, and the probe adopts a circular ring design, so that the distortion of the probe to an original electric field can be effectively reduced.

To ensure a surface pressure on the interface between the insertion hole in a bushing and a rubber mold body to prevent a void from occurring. The inventive bushing (2) is provided with an insertion hole (3a) for housing an arrester mold body (6), and a tapered insertion hole (53a) spreading in a conical shape from the high pressure side of the bushing (2) to the low pressure side is provided in a region where electric field of the insertion hole (3a) concentrates. The arrester mold body (6) is provided with a rubber mold body (67) consisting of silicone rubber or the like integrally molded around the outer periphery of an arrester element laminate (61), and the rubber mold body (67) is provided with a conical portion (67b) to be able to be fitted to the tapered inner surface of the tapered insertion hole (53a).

The bonded body of the present invention is a bonded body of a ceramic member made of ceramics and a Cu member made of Cu or a Cu alloy, and in a bonded layer formed between the ceramic member and the Cu member, from the bonded surface of the ceramic member toward the Cu member Cu in the region with a side distance of 50 μm 3 The area ratio of the P phase is 15% or less.

The invention discloses a manufacture method of a solid insulating circuit device, which comprises the steps of: cleaning the surface of an electric conductor of a circuit device, preheating and then placing into a heated mould, and injecting a liquid epoxy resin composite material composed of silicon micropowder, epoxy resin and a curing agent into the mould; and taking a molded solid insulatingcircuit device blank from the mould after the epoxy resin composite material in the mould is cured, placing the blank into a baking oven for post-curing treatment, then carrying out sand blasting treatment on the surface of the blank except the part of the interface of the electric conductor to be insulated, coating a layer of conductive coating, carrying out evaporation treatment in the air, andthen carrying out curing treatment in the baking oven to complete the manufacture of the solid insulating circuit device. Compared with the prior art, the invention can be used for effectively decreasing partial discharge values inside the solid insulating circuit device and surface inductive voltage of a product.

Disclosed are a semiconductor device, and a method for manufacturing semiconductors. When a voltage is applied to a semiconductor element formed into a semiconductor substrate for evaluating the electrical characteristic of the semiconductor element, partial discharge between the semiconductor element and an inter-element portion, adhesion of a foreign substance to the semiconductor substrate, andformation of a trace of a component in the semiconductor substrate are prevented. A semiconductor device includes a semiconductor substrate and a discharge inhibitor. The semiconductor substrate includes a plurality of semiconductor elements and an inter-element portion. The semiconductor elements are arranged in a spreading direction of the semiconductor substrate. The inter-element portion is between adjacent semiconductor elements among the semiconductor elements. The discharge inhibitor is bonded not to a surface of a center of each semiconductor element among the semiconductor elements but to a surface of the inter-element portion. The discharge inhibitor is made of an insulator.

Provided is an induction furnace capable of further increasing the voltage applied to a coil. An induction furnace (10) is provided with: a crucible (14) that houses a material (12) to be heated; a coil (16) that is wound around the outer periphery of the crucible (14) and has an insulating coating film; a conductive layer (18) that covers the outer peripheral surface of the coil (16); and a yoke(22) that holds the coil (16) from the outer peripheral side with the conductive layer (18) interposed therebetween. The conductive layer (18) and the yoke (22) are grounded. The conductive layer (18)is a conductive resin or a conductive adhesive, and is in close contact with the insulating film of the coil (16). A conductive buffer material (20) is included between the conductive layer (18) andthe yoke (22), and the conductive layer (18) is grounded via the buffer material (20) and the yoke (22).

This substrate for power modules is provided with a ceramic substrate and a circuit layer having a circuit pattern. At the interface between the circuit layer and the ceramic substrate, a Cu-Sn layerand a Ti-containing layer are sequentially laminated from the ceramic substrate side. With respect to the cross-sectional shape of an end portion of the circuit pattern of the circuit layer, the angletheta between the surface of the ceramic substrate and the end face of the Cu-Sn layer is within the range of from 80 degrees to 100 degrees (inclusive), and the maximum projection length L of the Cu-Sn layer or the Ti-containing layer from the end face of the circuit layer is within the range of from 2 [mu]m to 15 [mu]m (inclusive).

The invention discloses a polypropylene cable material under a polarity inversion working condition, and a preparation method and application of the polypropylene cable material. The polypropylene composite insulating cable material is prepared from the following components in percentage by mass: 99.5 to 99.7 % of a polypropylene matrix and 0.3 to 0.5 % of a thiobisphenol compound filler. On one hand, a hindered phenol unit in the thiobisphenol compound captures free radicals generated in the matrix through proton transfer, so formation of a low-density region in the polypropylene material isinhibited, and then occurrence of partial discharge is inhibited; on the other hand, multi-scale trap distribution is provided for the polypropylene matrix, so damage of collision ionization and high-energy charge movement to molecular chains is reduced, and therefore, breakdown strength is improved. The breakdown strength of the polypropylene thermoplastic cable insulating material prepared by the method is reduced slightly after polarity inversion, and the polypropylene thermoplastic cable insulating material still keeps good insulating property compared with pure isotactic polypropylene andis applicable to high-voltage direct-current cables.

The invention discloses a + / -660 kV direct-current composite insulator which comprises an annular metal connecting piece located at the end, a sealing ring, an epoxy resin glass fiber stick, a sheath and grading rings. The annular metal connecting piece is connected with the grading ring at the grounding end. The grading ring at the grounding end is connected with the front end of the epoxy resin glass fiber stick through the sealing ring. The outer surface of the epoxy resin glass fiber stick is wrapped by the sheath. Umbrella skirts of three specifications are arranged on the sheath. The tail end of the epoxy resin glass fiber stick is connected with the grading ring at the high-voltage end. According to the + / -660 kV direct-current composite insulator, the structural mode of one large umbrella and two small umbrellas of an extra-large umbrella with arranged flowers is adopted, the creepage distance is effectively increased on the basis of an existing structural height, the electric field distribution of the surface of the + / -660 kV direct-current composite insulator is improved, the local field intensity is reduced, partial discharge is restrained, meanwhile, ice and snow bridge connection can be blocked due to the structure, and the + / -660 kV direct-current composite insulator has the good ice, snow and lightning prevention capacity.

The invention relates to a three-phase common-box insulator assembly and a GIS. The three-phase common-box insulator assembly comprises three-phase center inserts arranged in a shape like a Chinese character'pin ', a flange and an insulating part arranged between the center inserts and the flange, electrodes are integrally poured in the insulating part and correspond to the center inserts, and the electrodes and the corresponding center inserts are correspondingly arranged in the radial direction. The electrode comprises an arc-shaped part which corresponds to the central insert and extends in the circumferential direction of the insulating part, and further comprises connecting parts, the connecting parts are located on the side, opposite to the central insert, of the arc-shaped part, and radial through holes corresponding to the connecting parts are formed in the flange; the connecting part is used for being connected with an electrification display wiring body penetrating into the radial through hole when the electrification condition is monitored, so that the electrode is communicated with the electrification display device; the connecting part is further used for being connected with a grounding piece penetrating into the radial through hole during grounding shielding, and the flange is provided with a grounding piece connecting part used for being connected with the grounding piece.

The invention discloses a bearing withstand voltage test method and a method for suppressing partial discharge of a bearing. According to the bearing withstand voltage test method, based on a discharge gap structure constructed between a bearing ring and a movable body, under the conditions that a bearing runs and insulating oil in a bearing gap breaks down under the action of first test voltage, electric signals are collected on the bearing ring and the movable body; therefore, the partial discharge is determined according to the collected electric signal, the applied test voltage can be determined as the withstand voltage of the bearing, the test operation is simple, the structure of the bearing does not need to be transformed, and the test difficulty is reduced.

[Problem] To provide a polyphase AC electric motor with which it is possible to suppress partial discharge. [Solution] The present invention is characterized in that: the winding for each phase has afirst partial conductor that is an input-side partial conductor, an n-th partial conductor connected to a neutral point, and second through (n-1)th partial conductors; and a partial conductor that isdisposed adjacent in the stator to the first partial conductor for each phase, or a partial conductor having a coil end part disposed adjacent to a coil end part where the first partial conductor extends from a slot to the outside, is (1) an a-th partial conductor (where a is a natural number equal to 2 or greater) of the same phase or a different phase in which the voltage assumes an extreme value when the alternating-current voltage from an inverter is applied, (2) any of (a-3)th through (a-1)th partial conductors of the same phase or different phases, or any of (a+1)th through (a+3)th partial conductors of the same phase or different phases, connected to an intermediate partial conductor for which the extreme value is adopted, or (3) any of (n-3)th through n-th partial conductors of thesame phase or different phases.

The invention provides a high-voltage isolation transformer, which includes one or more sub-transformers; when there is one sub-transformer, the high-voltage isolation transformer is equivalent to the sub-transformer; when there are multiple sub-transformers, the multiple sub-transformers are connected in cascaded form, All transformers are connected in parallel with voltage equalizing devices. The high-voltage isolation transformer provided by the invention avoids the situation that partial discharge is difficult to control. The voltage level can be extended to hundreds of kilovolts and above, and it is beneficial to the heat dissipation of the windings, which can realize effective insulation and isolation in a compact space. Effectively reduce the difficulty of transformer insulation design and manufacturing process and volume; the invention has high insulation withstand strength and low field strength distribution, and at the same time can realize effective suppression of partial discharge, and realize low partial discharge design of transformers, and the voltage level is above 100,000 volts The partial discharge amount does not exceed 50pC; it has the advantages of small structural size, high mechanical strength, and flexible installation.

Damage to a dielectric plate supporting unit and a metal vessel is kept to a minimum and the efficiency of plasma processing is improved. A resin layer is provided in a region where a dielectric plate and a processing vessel face each other. With this structure, particles and damage attributed to the difference of thermal expansion coefficients between the dielectric plate and the process vessel can be suppressed. In addition, local discharges at electric field boundaries such as edge portions of the dielectric plate are suppressed, thereby improving the efficiency of plasma processing such as formation of an oxide film.