74results about How to "Prevent corona" patented technology

The invention discloses a manufacturing method of an aluminum alloy prefabricated branch cable. The manufacturing method includes the following steps: (1) manufacturing a main cable body and a branch cable body; (2) connecting the main cable body and the branch cable body together through an aluminum alloy CL-type cable clamp, and pressing the aluminum alloy CL-type cable clamp in a connected mode; (3) winding the aluminum alloy CL-type cable clamp with a layer of self-adhesion waterproof adhesive tape, then wrapping the aluminum alloy CL-type cable clamp with two layers of hot melt adhesives, and then isolating cable cores with jackets; (4) processing the jacket of the main cable body and the jacket of the branch cable body through softening solvents to enable the surface of the jacket of the main cable body and the surface of the jacket of the branch cable body to be initially softened; (5) molding the main cable body and the branch cable body in an injection mode to form a whole. The aluminum alloy prefabricated branch cable manufactured with the manufacturing method has the advantages of being high in safety performance, good in insulating performance and electrical performance, high in shock resistance, easy and convenient to install and the like, and particularly has the excellent waterproof performance.

The invention relates to an installing method of a sensor for detecting XLPE (cross linked polyethylene) power cable partial discharge, which comprises the steps of firstly surrounding a flaky UHF sensor on the outer side of an exposed band insulating layer of an XLPE power cable accessory in a wrapping way, and then enabling the flaky UHF sensor to form an annular UHF sensor through seamless welding, in such a way, the propagation of an ultrahigh frequency signal is facilitated, and the original insulativity and electric field distribution of the XLPE power cable accessory are prevented from being damaged. The UHF sensor provided by the invention has the advantages that the head end and the tail end of the UHF sensor are in seamless welding, so that the phenomenon of electric corona or suspended discharge can be effectively avoided; and more importantly, since the UHF sensor is flaky, the UHF sensor can be cut and installed on site according to the thickness of the XLPE power cable accessory, so that the installation process can be greatly simplified, the working efficiency is improved, the manufacturing and use cost is reduced, and the universalityis greatly enhanced.

The invention relates to a manufacturing method of an air-cooled unit capacity hydrogenerator VPI (Vacuum Pressure Impregnating) stator coil bar. An inner shielding layer on the surface of a wire canreduce an internal local discharge probability of the wire. After the coil bar is bound with a VPI main insulation layer, a straight-line segment is bound in a half-lapping mode with a layer of low-resistance anti-corona material, then VPI of epoxy anhydride resin is carried out, after impregnation is ended, the end part is respectively bound in a half-lapping mode with medium resistance, medium-high resistance and high resistance segments, and the surface of an anti-corona segment of the end part is bound with two layers of additional insulation layers; after an anti-corona layer is processedwell, the coil bar is assembled into a hot-pressing die, pressurization is carried out, and the coil bar is placed into a baking oven to carry out heating, curing and forming; and after the main insulation layer is cured and formed, a protection layer is brushed with a high-resistance anti-corona paint and a surface coating varnish so as to obtain the finished product VPI stator coil bar. The air-cooled unit capacity hydrogenerator VPI stator coil bar has the main technical performance indexes that: (1) a breakdown voltage of the finished product coil bar is greater than or equal to 5.5UN; and (2) an electrical aging resistance experiment of the coil bar shows that the service life under a voltage of 3.0UN is greater than 40H, and the service life under a voltage of 2.0UN is greater than1,100h.

The invention relates to a wire clamp mounting structure and a lead wire partitioning rod with the same. The lead wire partitioning rod comprises a base body and at least three lead wire clamps which are evenly distributed on the base body in the periphery direction. The base body comprises at least three U-shaped bending plates which are evenly arranged in the periphery direction, and openings of the U-shaped bending plates are outward. The U-shaped bending plates are provided with bottom connecting plates and side plates. Two side plates are arranged at the two ends of each bottom connecting plate and can carry out elastic deforming oppositely and with the backs against each other. Each lead wire clamp is arranged to two adjacent side plates of two corresponding adjacent U-shaped bending plates. The lead wire partitioning rod is simple in structure and has buffering and shock weakening capacity.

The invention relates to a bundled conductor supporting and fixing fitting, comprising a bottom plate fixed on a supporting insulator, and a spacer bar disposed on the bottom plate, wherein the bottomplate is provided with a supporting member for supporting and fixing the spacer bar, the supporting member is provided with a supporting surface for supporting the spacer bar, the spacer bar is detachably and fixedly connected to the supporting surface by fixing bolts, and the supporting surface and the spacer bar are respectively provided with mounting holes for mounting the fixing bolts. When assembling, only the spacer bar and the supporting member are required to be detachably and fixedly connected by bolts, and the bolt connection is simple in operation, which, compared with the prior art that the operator needs to fix the spacer bar by welding, reduces assembly difficulty and is simpler to assemble. When fixing bundled conductors of different heights, the spacer bar is convenientlyremoved from the supporting member, only requiring a spacer bar of a suitable size to replace without replacing other components, thereby reducing replacement cost and maintenance cost.

The invention relates to a bundle spacer rod and support members thereof. The bundle spacer rod comprises a frame structure formed by connecting the heads and tails of at least three support members in sequence. Each support member comprises a support plate; the support plate comprises an intermediate plate section; the head and tail two ends of the intermediate plate section are respectively provided with a connection plate section; each connection plate section is provided with a passing hole; the adjacent two support plates are connected through fasteners passing through the passing holes; one end, away from the intermediate plate section, of the connection plate section is provided with a wire clamping plate section; and a wire clamping groove for clamping a cable to be fixed is formed between the wire clamping plate sections of the corresponding ends of the adjacent two support plates. The technical problems that since the number of components of a spacer rod in the prior art is large, installation process is tedious and the installation efficiency is influenced are solved.

The invention discloses an asymmetrical three-branch cross concentrated wave winding connection method. The number of pole pairs of windings is an odd number; the number of slots in each pole of eachphase is 3n; n is an arbitrary positive integer; distribution rules of windings in each phase are same; namely, the winding of each phase comprises two phase belts; each phase belt is formed by one and a half parallel branch windings; distribution rules of windings in each branch are same to form symmetric windings of asymmetrical branches. The asymmetrical three-branch cross concentrated wave winding connection method breaks the limitation of traditional alternating-current winding theory and provides an asymmetrical three-branch cross concentrated wave winding connection method for a motor with odd pole pairs; the conflict that capacities, voltage and rotation rates of a large pumped-hydro energy storage motor and a hydraulic turbine generator are not matched is effectively solved; the performance of the motor is improved, so that the motor is reasonable in structure, excellent in manufacturability and mountability, simple to maintain and reliable in operation; the technical and economical indexes of a power plant system are improved.

The invention provides a damper, relating to a damper. The damper can ensure the stability and reliability of the connection and is convenient to operate. The damper comprises a cable clamp which is used to connect the cable and a damper head which is connected at the bottom of the cable clamp through a steel strand, wherein the upper part of the cable clamp is provided with a hook which enables the cable clamp to be hooked on the cable and a pre-twisted wire which is used to bind the hook on the cable. The damper provided by the invention changes the cable clamp into a pre-twisted type, the pre-twisted type cable clamp has good mechanical properties and fatigue resistant performance and the phenomena that the cable clamp slips and the damper head falls off in the running process, and each component affects the anti-vibration effect caused by the loosened bolt in the prior art can be avoided; and meanwhile, the operation is more convenient. In order to prevent the corona generated by the pre-twisted wire protruding out of the surface of the back of the hook, a groove is arranged on the back of the hook so as to avoid the pre-twisted wire protruding out of the surface and the happening of the corona.

The invention provides a method for determining a position coordinate of an insulator in a transformer substation and an apparatus. The method comprises the following steps that: bearing analyses are carried out on all insulators in a V-shaped insulator chain so as to obtain horizontal bearings and vertical bearings of all the insulators; gradients of all the insulators in the V-shaped insulator chain are calculated according to the horizontal bearings and the vertical bearings; horizontal position coordinates of all the insulators in the V-shaped insulator chain are determined; and position coordinates of all the insulators in the V-shaped insulator chain are calculated according to the gradients and the horizontal position coordinates. Therefore, it is convenient for a designer of an electrical major to design an electrical dimension of an equalizing ring according to the position coordinates of the insulators. According to the invention, actual positions of a V-shaped insulator under various load effects, so that an electrical dimension of an equalizing ring can be designed conveniently and the efficiency of engineering construction is also improved.

The invention provides a tubular busbar connection structure. The tubular busbar connection structure comprises a first tubular busbar and a second tubular busbar which are telescopically assembled. One end of the first tubular busbar is arranged in the second tubular busbar. A contact extending along the axial direction of the tubular busbar is fixedly arranged in one of the tubular busbars, and a contact finger matched with the contact is fixedly arranged in the other tubular busbar. The annulus between the first tubular busbar and the second tubular busbar is provided with a limiting structure used for preventing radial swinging of the two tubular busbars. The first tubular busbar can be inserted into the second tubular busbar and can telescopically move. The contact and the contact finger which can be conducted with the tubular busbars are correspondingly arranged in the first tubular busbar and the second tubular busbar so that constant conduction can be guaranteed in telescopic movement of the two tubular busbars. Radial swinging of the first tubular busbar and the second tubular busbar can be prevented by the limiting structure so that the situation that the certain part of the contact finger is affected by excessive pressure and damaged can be prevented. The contact and the contact finger are installed in the tubular busbars without the influence of corona.

The invention relates to an aluminum pipe joint of an anti-slipping aluminum pipe jumper wire. The aluminum pipe joint comprises an outer joint and an inner joint. The inner joint is provided with a pipe fitting with a circular convex plate, the inner wall of the outer joint is arc-shaped, and the outer joint is provided with corresponding connecting holes. A circular clamping groove is arranged inside the outer joint, the structure of the aluminum joint is enabled to be stable, and a mechanical performance and an electrical performance are greatly improved.

The present invention discloses a power frequency test transformer high-voltage winding head-end current monitoring device and method. The monitoring device is composed of a high-potential current measurement part and a low-potential waveform reduction part; the high-potential current measurement part of the monitoring device is composed of a current sensor, a data acquisition unit, an optical fiber extender, a storage battery, a tray carrying a battery compartment, a connecting guide rod and a shielding shell; and the high-potential part and the low-potential part are connected with each other through an optical fiber so as to realize data and control signal transmission. With the power frequency test transformer high-voltage winding head-end current monitoring device and method of the invention adopted, power frequency test transformer high-voltage winding head-end steady and transient current waveforms in each test process can be monitored. The high-potential current measurement part is arranged in the shielding shell and adopts the optical fiber to transmit data, and therefore, electromagnetic interference can be effectively shielded. The monitoring device has a compact structure, so that the space of a laboratory can be saved; the monitoring device is not limited by test voltage levels; the power frequency test transformer high-voltage winding head-end current monitoring device is powered by the storage battery and can realize real-time monitoring for 10 hours; and the monitoring device has the advantages of reusability, long service life, convenient manufacture, low maintenance cost and the like.

The invention discloses a device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient. The device comprises an upper electrode, a lower electrode, a first constant temperature source, a second constant temperature source, a high-voltage direct-current power supply and a circuit protection device, wherein the upper electrode is used for being in contact with one side of each aged piece-shaped sample; the lower electrode is used for being in contact with the other side of each tested insulating material piece-shaped sample; the first constant temperature source is used for conducting the temperature to the upper electrode; the second constant temperature source is used for conducting the temperature to the lower electrode; the high-voltage direct-current power supply is used for controlling voltage of the upper electrode; and the circuit protection device is used for protecting a device in a circuit and the piece-shaped samples having not undergone breakdown. The device and the method are used for performing united aging on the multi-group piece-shaped samples under a high-voltage direct-current electric field and a temperature gradient field.

The invention relates to a variable-gap lightning arrester and a lightning protection device. The variable-gap lightning arrester comprises a lightning leading pole, a first conductor and a second conductor, the first conductor is used for being electrically connected with a grounding grid, the second conductor is elastically arranged on the first conductor, the lightning leading pole penetrates through the second conductor and is in insulation connection with the first conductor, a plurality of blades are annularly arranged on the periphery of the second conductor, in the first state, the second conductor and the lightning leading pole are spaced, and in the second state, the blades can drive the second conductor to abut against the lightning leading pole under the action of wind power. The second conductor is elastically connected with the first conductor, the lightning leading pole is spaced from the second conductor, the second conductor is provided with the blades, and the bladesenable the second conductor to abut against the lightning leading pole under the action of wind power, so that an electric path is achieved. The structure can avoid the problem that the lightning leading pole cannot conduct lightning smoothly due to corona, can avoid corona by blowing away a large amount of charges on the lightning leading pole through wind, and has the characteristics of simple structure and high lightning leading reliability.