68results about How to "Reduce AC resistance" patented technology

The invention provides a coil including an output terminal, an input terminal and a winding part connected between the output terminal and the input terminal. The coil is characterized in that at least a part of the winding part is provided with a slot hole, and the depth of a cross section of the winding part where the slot hole is located in any direction is smaller than or equal to a distance between two points with a largest distance on the cross section of the winding part, wherein the winding part is a metal conductor formed by spiral winding, and the input terminal and the output terminal are used for connecting the winding part to an external circuit.

The invention relates to a measurement method for alternating-current resistance of a cable conductor. The method comprises the following steps: applying large current to a conductor loop by adopting a voltage regulator and a straight-thought transformer; after the temperature of the conductor is stable by long-time current heating and temperature raising, synchronously measuring voltage and loop current in one section of the conductor and the surface temperature of the conductor; extracting amplitudes and phases of voltage and current signals by Fourier transformation, and calculating a phase difference between the voltage and the current; finally, calculating the alternating-current resistance of the conductor by adopting a formula. The method is high in measurement precision, good in stability, good in consistency of repeated measurement, simple in structure and convenient to measure, and is particularly suitable for measuring the alternating-current resistance of the cable conductor with a large section.

The invention discloses a flexible hollow cable. The cable comprises a plurality of strands of wires and an insulating outer sheath (1) which covers the wires, and is characterized in that: the wires (2) are hollowly arranged and are mutually and closely arranged; and a hollow layer which is formed after the wires are arranged is filled with a light elastic filler (3) or is supported by a spiral spring (17). The wires of the cable are hollowly arranged, so that a skin effect of alternating current is utilized, the cross section of a conductor is effectively utilized, and the alternating current resistance and the power loss are low. Meanwhile, the cable has a large external contact surface due to hollow arrangement, good heat dissipation conduction and low temperature rise and contributes to heat dissipation of a conductor material, so that the normal service life of the cable is guaranteed.

The invention discloses a cross-linked polyethylene insulated power cable with a divided conductor structure. Buffer water blocking tape, corrugated aluminum sheath and non-metallic outer sheath layer. The conductor is cabled by several fan-shaped strands to form a conductor with an overall circular cross-section. Insulation corrugations are used between each fan-shaped strand The paper is separated to insulate the strands from each other, so that the conductor is equivalent to being composed of several mutually insulated fan-shaped strands connected in parallel. Since the cross-sectional area of ​​a single strand is only a fraction of the total cross-sectional area of ​​the conductor, the "skin effect" and "proximity effect" of a single strand are greatly reduced, thereby achieving the purpose of reducing the AC resistance of the conductor.

The invention discloses a magnetic conductive wire comprising a conducting wire body, and at least one magnetic paint layer and at least one insulated paint layer which are coated at the outer side of the conducting wire body and arranged in a mutually staggered manner, wherein the magnetic material in the magnetic paint layer is non-electrically conductive. Magnetic paint is formed by adding the magnetic material to the insulated paint, and the magnetic paint and the non-magnetic insulated paint are coated at the outer side of the conducting wire body in a staggered manner, thus magnetic field interference generated after the galvanization of the conducting wire body is guided or offset by using the magnetic material, the formation of eddy current of the conducting wire is effectively inhibited, and the purpose of reducing alternating current resistance is achieved.

The invention discloses a novel wind generating set bus duct. The novel wind generating set bus duct comprises a bus duct body and adaptor boxes arranged on the two ends of the bus duct body, the bus duct body comprises a shell and three bus units, the shell is made of aluminium magnesium alloy, the three bus units are arranged in an inner cavity formed by the shell and are fixed in the shell through insulating supports, four pipe buses made of aluminium alloy are arranged in each bus unit, each pipe bus is sleeved with an insulating layer, the corresponding pipe buses of the bus units are connected with one another through flexible bus units in a cone mode and are fixed through flanges, joints are provided with temperature monitoring devices, and the bus duct body is arranged on the wall of a tower through an elastic support. The novel wind generating set bus duct is simple in structure, low in impedance, pressure drop, energy consumption and cost, and high in use reliability, solves the problems that traditional bus duct connection units can not bear long-time shake of the tower, and is unreliable in electric conduction, and further overcomes the defects that a rectangular aluminium bus is large in pressure creep deformation, the surface is oxidized easily, and the connection portions have poor contact to cause accidents.

The invention discloses a planar transformer. The planar transformer comprises an upper magnetic core, a lower magnetic core and multiple flat coils arranged between the upper magnetic core and the lower magnetic core. The adjacent flat coils are insulated. Each flat coil is formed by multiple turns of metal conductors coiled into a spiral shape. The flat coils are vertically projected in space and overlapped vertically. Some flat coils form primary windings of the planar transformer, and the other flat coils form secondary windings of the planar transformer. The planar transformer is characterized in that according to the direction from the center to the outer side of each flat coil, the widths of the turns of each flat coil change as the following form: W1:W2:...:Wn=1:a:...:a(n-1), W represents the widths of the coils, n represents the number of turns of the coils and is larger than or equal to 1, a is larger than or equal to 0.5 and smaller than 1 or a is larger than 1 and smaller than or equal to 1.5, and the widths of the turns of each flat coil change consistently. Magnetic field distribution of the transformer can be changed by changing the widths of the turns of each coil, so that coupling performance and the alternating current loss are changed. The planer transformer has the advantage that leakage inductance and alternating current resistance of the planer transformer can be adjusted according to the actual needs.

The invention discloses a reinforced optical fiber composite high-temperature-resistant overhead insulating cable which comprises a carbon fiber composite reinforced core. A plurality of round flexible aluminum wires and a stainless steel sleeve light unit are stranded on the outer side of the carbon fiber composite reinforced core in a concentric mode. A plurality of special-shaped flexible aluminum monofilaments which are distributed in a round shape are arranged on the outer sides of the round flexible aluminum wires and the outside of the stainless steel sleeve light unit, and a high-temperature-resistant insulating layer is arranged on the outer sides of the special-shaped flexible aluminum monofilaments. The reinforced optical fiber composite high-temperature-resistant overhead insulating cable is simple in structure, long in service life and suitable for reconstruction and construction of power grid overhead lines in urban and rural areas, can bear the tension strength of 2400Mpa, allows long-time operation temperature to be more than 180 DEG C, has communication and monitoring functions, can effectively solve the dropping problem of the cable, and guarantees safe operation of lines.

The invention relates to a copper core (5+1) dividing conductor with large cross section. The copper core dividing conductor comprises a central unit stranding conductor and five sector-shaped copper core stand blocks with the same size and cross section shape, wherein the sector-shaped copper core stand blocks are sequentially wound outside the periphery of the central unit stranding conductor; only one of the sector-shaped copper core stand blocks is directly contacted with the central unit stranding conductor; insulating belts are arranged between the other sector-shaped copper core stand blocks and the central unit stranding conductor; an insulating belt is arranged between every two sector-shaped copper core stand blocks; and semiconducting Tetoron belts are wound on the central unit stranding conductor and the five sector-shaped copper core stand blocks. The influence of an alternating-current skin effect is greatly reduced by the conductor with the large cross section, the alternating-current resistance is reduced, the transmission capacity of a cable is greatly improved, and the conductor is firmer and is not easy to loosen during processing.

The invention provides a submarine cable, and relates to the technical field of cables. The submarine cable comprises a plurality of core wires which are twisted together. Each core wire comprises a first metal wire and a conductive layer wrapping the first metal wire; and the conductivity of the conductive layer is greater than that of the first metal wire. Through the above arrangement, when the submarine cable is electrified by alternating current, the current concentrated on the surface part of the first metal wire is partially transmitted to the conductive layer, so that the through-current capability of the surface part of the first metal wire is improved, the alternating current resistance of the first metal wire is reduced, and the electric energy loss is reduced.

The invention provides a self-damping low-loss high-corrosion-resistant hard aluminum wire strand, which improves the anti-corrosion performance of the wire, reduces the breeze vibration of the wire,reduces the line loss and effectively increases the line distance under the condition that the overall outer diameter of the wire is not changed, the wind load of the wire is not increased, and the transmission capacity is not reduced. The wire strand comprises an inner core and an outer stranding layer, wherein the outer stranding layer comprises an inner layer conductor, an outer layer conductor, and the inner core is zinc-5% aluminum- load-bearing reinforce core formed by concentric strand of mixed plated steel wire, At least one close out conductor layer consist of a plurality of 63% IACSconductivity SZ-type cross-sectional aluminum wire strands is concentrically stranded on the inner conductor lay, and the inner conductor layer comprises N stranded 63% IACS conductivity circular cross-sectional aluminum wire strands.

The invention discloses an integrated energy extracting device for power electronic equipment. The device comprises a current transformer (1), a cable fixing unit (2), primary side terminals (3) and a transformer (10), wherein at least one cable fixing unit (2) is fixed on the current transformer (1) through screws, and two primary side terminals (3) are arranged at two ends of the current transformer (1) respectively and connected with the transformer (10) through cables. The device mainly supplies working energy for a trigger board (TE board) working with a high potential, and is provided with superior electrical and mechanical properties, simple in structure and easy to implement.

The invention discloses a permanent magnet motor and a compressor. The permanent magnet motor comprises a stator and a rotor. The stator comprises a stator core, a plurality of coil groups, and two motor lead groups. Each coil group comprises a plurality of coils which are coiled on stator bulging teeth. Each coil group comprises an incoming line terminal and a leading-out terminal formed by joints in the same number. Each motor lead group has a plurality of joints used to connect with the coil groups, and a motor lead of a motor control circuit. An inverter with a control algorithm provides power input for the permanent magnet motor. An effective value Um of maximum voltage between terminals, provided to the permanent magnet motor by the inverter, and no-load back EMF ke value between motor line terminals satisfy 4<=Um/ke<=56, wherein unit of Um is volt, unit of ke is volt/thousand round per minute. The permanent magnet motor can also satisfy torque output capacity of a motor in high-frequency.

The invention discloses a stack-up electronic part and a manufacturing method thereof. The stack-up electronic part comprises a stack-up part, which is provided with a plurality of insulation layers and internal coil parts disposed on the insulation layers in a stack-up manner; an external electrode, which is disposed on the outer side of the stack-up body, and is connected with the internal coil parts. The internal coil parts are used to form step difference on a cross section in the width-thickness direction of the stack-up body.

The invention provides a self-damping, low-loss, high-strength aluminum-clad steel-cored heat-resistant aluminum alloy stranded wire, which effectively reduces the weight per unit length of the wire without changing the outer diameter of the original wire and increasing the wind load of the wire. Self-weight specific load. It includes an inner core wire core and an outer stranded layer, and is characterized in that: the outer stranded layer specifically includes an inner layer conductor and an outer layer conductor, and the inner core wire is specifically a bearing formed by concentrically twisting aluminum-clad steel wires. A force-reinforcing core, concentrically and tightly twisting a layer of the inner conductor layer composed of several drawn-out circular cross-section aluminum wire strands outside the force-bearing reinforcing core, and concentrically twisting at least one layer on the inner conductor layer The outer conductor layer is composed of several trapezoidal cross-section aluminum wire strands.

The invention relates to a coaxial cable with low-loss shielding layer. An intermediate copper conductor employs a hollow copper pipe structure, a silver plating layer is arranged on a surface of a hollow copper pipe, the AC resistance is reduced, the total weight of the cable is reduced, and the cost is reduced; a PTFE high-temperature material is foamed to form a foamed insulation layer, a plurality of insulation air tubes which are longitudinally arranged and encircle the intermediate copper conductor are formed by a longitudinal hole technology during foaming, the air rate of the foamed insulation layer is improved by the insulation air pipe, and the cooling passage and the cooling area are expanded; a silver plating copper strip is arranged outside the foamed insulation layer and forms a metal wrapping layer, a silver plating copper wire weaving shielding layer is employed, the shielding effect is improved, the cable loss is reduced, the interference-resistant capability is improved, and the transmission performance is stable; an outer sheath wear-resistant layer of a TPU polyurethane material at the outmost part has the performance of high wear resistance, low-temperature resistance and oil resistance, and the service lifetime of the cable is prolonged.

The invention relates to a self-heat-dissipation high-voltage cable. The self-heat-dissipation high-voltage cable comprises a central copper pipe, a Z-shaped conductor, a split conductor and a compressed conductor are sequentially arranged outside the central copper pipe, and at least one layer of compressed conductor is arranged. A conductor shielding layer, an insulating layer and an insulatingshielding layer are arranged outside the compressed conductor, wherein each layer is uniform in thickness. a buffer layer is arranged outside the insulating shielding layer, a metal sheath is arrangedoutside the buffer layer, an anti-corrosion layer is arranged outside the metal sheath, an outer sheath is arranged outside the anti-corrosion layer, an electrode layer is arranged outside the outersheath, and the Z-shaped conductor is composed of Z-shaped conductive single bodies. The self-heat-dissipation high-current-carrying capacity is achieved, and losses in the operation process are effectively reduced.

The invention belongs to the power transmission line power cable field and particularly relates to a welding type cable conductor connector having the current sharing effect and a welding method. Thetotal layer quantity of conductors is N, when M layers of internal conductors are welded, low resistivity welding rods A are utilized, when O layers of middle conductors are welded, low resistivity welding rods A are utilized, when (N-M-O) layers of external conductors are welded, high resistivity welding rods B are utilized. The method is advantaged in that a problem of temperature rising of theconductors and connector points during application of large-cross section layered insulation conductors can be solved. On the condition that the layered energy saving and consumption reduction conductor performs the effective AC resistance reduction effect, disadvantages of relatively large AC resistance and relatively high temperature existing in a traditional crimping type cable conductor connector under long-term rated work conditions are ameliorated, the process is simple, field maneuverability is strong, line operation loss of the large-cross section AC power cable can be reduced, power transmission efficiency is improved, and the excellent energy saving and consumption reduction effect is realized.

The invention discloses a conductor having a built-in stranded inner core and capable of reducing AC resistance. The conductor comprises an inner conductor, wherein the inner conductor enables itself to have positive charges after being electrified by positive DC electricity, the inner conductor comprises multiple inner cores and a filling material, the multiple inner cores are stranded into a bundle, an outer surface of the stranded multiple-core bundle is externally wrapped in an inner insulation layer, the filling material is filled between the stranded multiple-core bundle and the inner insulation layer, an outer surface of the inner insulation layer is wrapped in an outer conductor used for transmitting AC electricity, the inner conductor, the inner insulation layer and the outer conductor are coaxially arranged, the inner cores, the filling material and the outer conductor are prepared by an excellent conductor material, and the inner insulation layer is prepared by an insulation material. During AC transmission, free conductive electrons flowing in the outer conductor are uniformly distributed generally, so AC resistance of the outer surface of the outer conductor is reduced, electric energy loss is reduced, the outer conductor fully performs the conductor effect, and the conductive performance and the utilization rate of the conductor are greatly improved.

Provided is a separating conductor for an ultra-high voltage cable. The separating conductor for the ultra-high voltage cable comprises a plurality of separating strand blocks and a single circular guide line, a plurality of strands of circular single lines are twisted to be the separating strand blocks, the single circular guide line is arranged at the center interval after the separating strand blocks are combined, the single circular guide line is coated with insulation and water resistance paste, every two adjacent separating strand blocks are separated through insulation and water resistance tape, and the position between every two adjacent circular single lines in each separating strand block is also coated with insulation and water resistance paste. The separating conductor is mainly used for the ultra-high voltage cable, the separating effect is remarkable, the structure is stable, the excellent longitudinal water resistance performance is achieved, the alternating current resistance of the separating conductor is smaller than that of an ordinary separating conductor, the manufacturing process is simple, and production cost is low.

The invention discloses a tubular type wind power bus-bar support clamp. The tubular type wind power bus-bar support clamp comprises a tubular type wind power bus-bar upper support and a tubular type wind power bus-bar lower support, which are connected with each other through a plurality of high strength outer hexagon bolts; the cross section of the tubular type wind power bus-bar upper support and the tubular type wind power bus-bar lower support is of a structure in the shape of Chinese character pin; and one tubular type wind power bus-bar is connected in each square of the structure in the shape of Chinese character pin. The tubular type wind power bus-bar support clamp provided by the invention is novel in appearance, small in space occupation, and quick and convenient in installation; and besides, the insulating performance of the tubular type wind power bus-bar is improved, the mechanical strength of the tubular type wind power bus-bar is enhanced, the weathering performance of a tubular type wind power bus-bar system is enhanced, and the performance of adapting to a marine environment of the tubular type wind power bus-bar system is enhanced.