38results about How to "Avoid breakdown accidents" patented technology

The invention belongs to the electric power equipment fault detection and diagnosis technology field and especially relates to an XLPE power-cable partial discharge diagnosis method and a system thereof. The method comprises the following steps of collecting a low-frequency ultrasonic wave signal and an ultrahigh-frequency partial discharge signal generated by power-cable partial discharge, acquiring time delay of the ultrasonic wave signal and acquiring a distance between a partial discharge point and a partial discharge detection point; determining a phase window which has partial discharge; establishing a relation between an ultrasonic wave signal amplitude of the phase window and a phase of an applied power frequency voltage; drawing ultrasonic partial discharge phase information and amplitude information into a phase spectrum graph; and carrying out statistics characteristic calculating and extracting 27 statistics operators representing a partial discharge characteristic. In the invention, the ultrahigh-frequency partial discharge signal generated by the partial discharge is taken as a time reference and is combined with a low-frequency ultrasonic partial discharge signal so as to acquire time delay of the ultrasonic signal, and finally identification of the partial discharge signal is realized.

The present invention discloses an anti-oxidation capacitor film. The anti-oxidation capacitor film includes a base film and a first aluminum coating, a zinc coating and a second aluminum coating that are sequentially plated on the base film. The second aluminum coating is of a step structure, thereby improving the grade and self-healing effect of a capacitor. The second aluminum coating is provided with a tung oil protection layer, thereby preventing the aluminum coating and the zinc coating from being oxidized by air, improving the anti-oxidation capacity of a metalized capacitor film, and prolonging the service life of the capacitor. The present invention further discloses a preparation method of the anti-oxidation capacitor film. Isotactic polypropylene is used as a main material, additives and other materials are added, the base film is obtained through melt extrusion, blowing and stereotyping, sheet casting, two-way stretching, cooling stereotyping, setting amplitude and trimming, dragging and cutting, winding and two times of aging treatment, and in a vacuum condition, the base film is sequentially plated with the first aluminum coating, the zinc coating, the second aluminum coating and the tung oil protection layer so as to obtain the anti-oxidation capacitor film. The capacitor film prepared by the method has good temperature resistance and anti-oxidation performance.

This invention discloses a crimp connection for casing tube or crimped lock for wire used in power transmission and distribution line composed of a columnary matrix, the section of which exhibits C shape, two lineal furrows are set at both ends point distributed locking reentrants/humps or continuous or discontinuous locking furrows or locking ribs are set up on the surfaces of inner/output surfaces of the matrix and the furrows to stitch the crimped lock with wires due to the above-mentioned crimped lock structure, increasing its pulling force, reducing its connection adapted resistance and temperature rising.

The invention discloses a dynamic allocation method and device for an AGC unit based on a regional power grid active power gap. The method comprises the steps: monitoring whether the regional power grid has a fault or not; calculating an overall active power vacancy value, an overall active power change rate and an emergency active power change rate in a network in real time; and adding or quitting allocation on the AGC unit according to the rate gap if the emergency active power change rate is higher than or lower than an existing overall active power change rate in the network. The AGC unitis deployed according to the real-time active power change rate of a power grid, thereby guaranteeing the average value, zero crossing and other indexes of the power grid area control deviation withinthe specified time. The number of AGC units in the period is controlled when the power grid fluctuation is small, thereby reducing the frequency fluctuation of a power grid system, avoiding invalid actions of the units, and achieving coordinated development of a power grid source.

The invention provides a missile test device mistake prevention system and method. The system comprises a two-dimensional code judging module, a resistance judging module, a digital I/O judging module, a PXI board card assembly, a judging module, and a test industrial control computer. In combination with two-dimensional codes, resistance identification and electronic ID identification, for solving the problems that in the missile product test process, due to manual mistakes, tested missile products are prone to being mixed up, and test cables and test equipment connector adaptors are mis-connected, the mistake prevention system of tested missile products, a test cable, a interface adapter and mistake prevention test software is formed. Compared with previous manual checking manner, through the automatic program, mistake prevention detection is carried out from the product end to the test equipment end, the failure accident caused by manual mistake can be effectively avoided, and the test safety is improved.

The invention relates to a production technology of a metallized film. The production technology is characterized in that an insulation base film is performed with an insulation base film pretreatment technology, a primary evaporation technology, a galvanized layer surface treatment technology, a secondary evaporation technology and a silver plating layer surface treatment technology, so as to form the metallized film. The production technology has the advantages that the surface of the insulation base film is treated by hydrosulphuric acid solution, so that the large-scale oxidizing of metal zinc on the surface of the insulation base film is avoided, the bonding force between a zinc plating layer and the insulation base film is guaranteed, and the self-healing capability of the metallized film is improved; a metal layer on the surface of the insulation base film is of a zinc plating layer, zinc oxide layer, silver plating layer and silver oxide oxide film four-layer structure, so that the erosion rate of the metal layer is effectively reduced, the capacity of a capacitor is not decreased, and the breakthrough accident is avoided; the service life of the metal layer is obviously prolonged.

The invention discloses a high voltage dry-type current transformer and a ground protection method thereof, a ground wire is arranged on an end screen of a primary winding of the high voltage dry-type current transformer, a ground protection branch is further parallel-connected on the end screen of the primary winding of the high voltage dry-type current transformer, the ground protection branch is provided with a ground protector which mainly consists of a capacitor, one end of the ground protector is connected with the end screen of the primary winding, and the other end is grounded for increasing the equivalent capacitance value of the end screen of the primary winding to the ground. The capacitor type ground protector is parallel-connected between the end screen of the primary winding and a housing in the technical scheme of the invention, thereby increasing the equivalent capacitance value of the end screen to the ground, clamping the loaded floating voltage on the end screen to a smaller value which is much lower than the tolerant voltage of the end screen, further avoiding the accidents of insulation breakdown of the primary winding and greatly increasing the reliability of the user of the high voltage dry-type current transformer.

The invention discloses a preparation method of a medium-low voltage water tree resistant cable insulating material, the medium-low voltage water tree resistant cable insulating material comprises the following components: a material A comprising polyethylene, a water tree resistant graft polymer, a nanoinorganic nucleating agent and a carbon quantum dot nucleating agent, and a material B comprising polyethylene base resin, a cross-linking agent and an assistant cross-linking agent. The beneficial effect of the method is to improve the hydrophilicity of the insulating material. The dispersion of water is improved, and the breakdown accident of the insulation material caused by the fact that a common cable insulation material easily generates water trees in the presence of water is solved.

The invention discloses a variable-diameter sealing structure and a sealing method for cables passing through walls or pipes. The installation body is provided with an installation hole, and a base sleeve is fixed in the installation hole. The base A flexible sealing layer is fixed inside the sleeve, and the cable is passed through the central through hole of the flexible sealing layer. The inner and outer end faces of the flexible sealing layer are respectively fixed with an upper gland flange and a lower gland flange. The flange is pressed against the outer end surface of the base sleeve, and the upper gland flange, flexible sealing layer and lower gland flange are fixed together by a connecting rod; the flexible sealing layer is made of flexible material, which solves the problem of Cable breakdown accidents caused by long-term immersion of cables due to the inability of the existing sealing materials to be tightly sealed with cables and wall pipes; it is also reserved for future expansion, reducing upgrade maintenance and unintentional construction problems, and bringing new benefits to installation, commissioning and maintenance. For great convenience.

The invention discloses a water-cooling bearing pedestal of a transmission shaft of a ball mill. The water-cooling beraing pedestal comprises a lower half body of the bearing pedestal and an upper half body of the bearing pedestal connected to the lower half body of the bearing pedestal, wherein a semi-circular cooling room of an integrated structure is arranged on the top of the upper half body of the bearing pedestal; a water inlet pipe joint is arranged on one side of the cooling room; a water outlet pipe joint is arranged on the other side of the cooling room; an empty groove is formed inthe middle of the cooling room; and the empty groove avoids a hoisting hole and an oil filling port formed in the upper half body of the bearing pedestal, so that the ball mill is conveniently hung and a bearing body is refueled conveniently, and the technical conditions and using functions of the original bearing body are not affected. The water-cooling bearing pedestal disclosed by the inventionovercomes failures and accidents as the temperature of the bearing is too high in operation of the ball mill, so that the operating rate of the ball mill is improved, the production cost and the maintenance cost are lowered, and the water-cooling bearing pedestal is simple in structure, stable and reliable and convenient to mount and use.

The invention discloses an online monitoring method for partial discharge of high-voltage feeder cables of an electrified railway. The method comprises the following steps: high-frequency current transformers are arranged on cable grounding wires of multiple high-voltage feeder cables; the high-frequency current transformers acquire partial discharge signals of the cables synchronously and send the signals to an acquisition unit for processing through coaxial lines with equal length; the acquisition unit sends multiple processed partial discharge signals of the cables to a monitoring main unit, and the monitoring main unit judges the high-voltage feeder cables which have partial discharge through analysis. The problem of inaccurate partial discharge testing of the cables due to same-phaseside-by-side laying of the multiple feeder cables and the problem of response lag in conventional fiber temperature detection are solved, complicated field manual operation is not needed, all that isneeded is to synchronously acquire the partial discharge signals at a high speed through high-speed multiple channels and analyze signal amplitude and delay conditions so as to test partial dischargeof each cable of the same phase rapidly, insulation status of the cables is evaluated, and breakdown accidents are prevented.

The invention relates to a motor running management device. A synchronous sampling analog-to-digital converter calculates by a current/voltage isolation transmitter through the secondary transmission of current and voltage, running data is sent into an ADSP (advanced signal processing) processor by an SPI (serial peripheral interface) bus and is analyzed by the ADSP processor, the computed and analyzed data is transmitted to an external data storage through 40 waveform points continuously recorded by wave sampling each week, and the data obtained by the ADSP processor is uploaded and displayed through a communication chip by a communication method and an LCD (liquid crystal display) screen. The motor running management device is suitable for the analysis of running energy efficiency, prewarning of faults, control and protection of low-voltage motors, is especially suitable for occasions with high utilization rate of motors, on-site buses and computer networking systems, and is capable of replacing various types of widely applied existing motor protection controllers.

A cable hoop based on adjustable spacing disclosed by the present invention comprises a fixing unit and a pushing unit, the fixing unit correspondingly comprises a pedestal corresponding to a clampingrod, and the pedestal correspondingly comprises a first pedestal corresponding to a distance increasing piece, a second pedestal corresponding to a distance increasing piece and a clamping rod corresponding to the clamping rod. The pushing unit correspondingly comprises a pushing rod corresponding to the pulling piece, the pulling piece corresponds to the shell, the pushing rod correspondingly comprises a connecting part corresponding to the pulling piece, and the clamping part corresponds to the inserting piece. According to the device, a push type clamping structure is adopted, the long clamping rod and the base are matched to clamp a cable, stress points of the cable are scattered, and cable breakdown accidents are effectively prevented; two or two groups of cables can be fixed at thesame time, and the use mode is more flexible; and the distance between the two groups of cables can be adjusted as required, thereby being safer.

The invention relates to a processing technique of a metallized film. Corona discharge pretreatment is conducted on an insulating base film twice, and then primary evaporation, surface treatment of a zinc coating, secondary evaporation, and surface treatment of an aluminized coating are conducted, so that the metallized film is obtained. The bonding strength of a metal layer of the metallized film and the insulating base film is high, and the alternating voltage resistance is remarkably improved; the metal layer is of a four-layer structure including the zinc coating, an zinc oxide coating, the aluminized coating and an oxide film so that the corrosion rate of the metal layer can be effectively decreased, the capacity of a capacitor cannot be decreased even if the zinc coating is corroded, the adaptability to high high-voltage alternating currents cannot be affected, insulating defects are avoided, and the breakdown accidents are avoided; and according to the processing technique of the metallized film, the processing technique is simple, the loss of the zinc coating is reduced, the production efficiency is high, the production cost is low, and the service life of the metallized film is long.

The invention discloses a push type cable hoop, and the hoop comprises a fixing unit and a push unit, and the push unit is arranged in the middle of a base. A cable is placed on the fixing unit, and the pushing unit pushes the clamping rod to enable the clamping rod to clamp the cable on the base. According to the device, a push type clamping structure is adopted, the long clamping rod and the base are matched to clamp a cable, stress points of the cable are scattered, and cable breakdown accidents are effectively prevented; two or two groups of cables can be fixed at the same time, and the use mode is more flexible.

The present invention relates to the technical field of the UPS power supply, and discloses a UPS power supply for oil field ground driven screw pump oil production. A filling cavity is arranged between a lower end surface of a storage plate and a bottom plate of an outer storage casing; and the filling cavity has two layers, respectively an upper layer of an activated carbon adsorption layer anda lower part of a pearl cotton cushion layer. The whole of a dumping induction member comprises outer contacts at both ends; slider contacts are sleeved on both ends of the sliding rod; the middle portion of the sliding rod is provided with a convex connecting column; a return spring is connected with both sides of the connecting column; and alarm indicators are installed on four sides of the outer storage casing. According to the UPS power supply for oil field ground driven screw pump oil production provided by the present invention, the elastic pearl cotton cushion layer is used to pressurize the power supply, and the pearl cotton cushion layer is cooperated with the activated carbon adsorption layer, so that the device has the functions of flexible buffering and moisture adsorption, andthe safety of the working environment of the power supply is improved; and when the UPS power supply is dumped, the alarm indicator corresponding to the dumping direction will light up and display visually to remind the operator to correct the situation in time.