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

The invention discloses online monitoring method of the insulation state method for crossing polyethylene insulated power cable that adopts DC superposing method to take online testing for the three phase XLPE power cable. After gaining the parameters, GPRS would send it to host computer, which would take analysis to the data and judge the insulation state. The invention realizes unattended operation online monitoring and wireless remote controlling and measuring.

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 provides a wiring harness protection device for a sweeper, and relates to the technical field of wiring harness protection. The wiring harness protection device for the sweeper comprisesa metal shell; first condensing pipes are inserted in the metal shell in a penetrating mode; and heat conduction layers are arranged in the first condensing pipes in a sleeved mode. According to thewiring harness protection device for the sweeper, heat generated by the wiring harness is monitored by a thermal-sensitive resistance switch mounted in the wiring harness protection device. When heatis excessive, due to the characteristic of the thermal-sensitive resistance, a circuit is switched on by the thermal-sensitive resistance switch, and a water pump is started; the water pump drives water in a water tank to circularly flow in the condensing pipes; the heat emitted by the wiring harness is transmitted to the condensing pips by the heat conduction layers and heat conduction fillers; and the heat of the wiring harness is taken out by the condensing pipes, and is emitted to the outside by heat dissipation copper pieces, the aim of lowering the temperature of the wiring harness is achieved, accident of circuit breakdown caused by heating of the wiring harness leading to softening, aging and fracture of an insulating layer is avoided, and the service life of the wiring harness isprolonged and safety of the wiring harness 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 belongs to the technical field of film capacitors, and more particularly to a high current withstanding metallization film capacitor with long service life. The film capacitor comprises a base film in thickness of 350-450mm and a metal coating deposited on the base film, and the metal coating is deposited as an aluminum coating and a zinc coating. The aluminum coating is coated with a shale oil layer and the zinc coating is coated with a silicone oil layer. According to the method of the invention, the film capacitor is coated with different coatings on the surfaces of the aluminum coating and the zinc coating, which is able to enhance the antioxidant capacity of the metallization film capacitor, to avoid breakdown accident to the film capacitor, to prolong the service life of the capacitor, to improve the firmness between the metal coating and the base film and to improve the voltage withstanding and temperature withstanding properties of the capacitor. The metallization film capacitor prepared by the invention has a flat structure, reducing the surface corona treatment, making loss value of the metallization film capacitor stable in its working, increasing its capacity, and greatly extending its service life.

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 a connection sealing structure of an electric transmission line, and relates to the field of electric power engineering. The key points of the technical scheme are as follows:the connection sealing structure comprises a structural layer which is arranged on the electric transmission line and is made of a cross-linked polyethylene material, and a protective layer which is coated on the outer side of the structural layer and is made of a silicon rubber material, wherein a self-made adhesive layer is arranged between the structural layer and the protective layer, and theadhesive layer is dissolved and compounded on the inner walls of the structural layer and the protective layer so that the structural layer and the protective layer form an integrated fusion type interface. The self-made adhesive layer is adopted, the adhesive layer enables the cross-linked polyethylene material and the silicone rubber material to be fused into an integrated structure in a chemical mode, the possibility of existence and generation of air gaps is fundamentally eliminated, and thus the voltage resistance is improved, and air gap discharge is avoided. Due to the existence of theadhesive layer, the connection sealing structure has a certain repairing capability, construction defects generated in the construction process can be eliminated, and breakdown accidents caused by thefact that moisture permeates from the wire core and the outside along the pressing interface can be prevented.

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.

The invention discloses a reinforced waterproof medium-voltage cable accessory, which specifically relates to the field of medium-voltage cable accessories. The reinforced waterproof medium-voltage cable accessory comprises a wiring terminal, a sealing tube, a terminal main body, a cold shrink insulating tube, a cold shrink three-fork finger sleeve and a sealing part, wherein a cable is arranged in the cold shrink three-fork finger sleeve in a sleeving manner; the cable penetrates through the cold-shrink insulating tube, the terminal main body and the sealing tube and is fixedly connected withthe wiring terminal; the sealing part is arranged at the joint of every two of the wiring terminal, the sealing tube, the terminal main body, the cold-shrink insulating tube and the cold-shrink three-fork sleeve in a sleeving manner; the sealing part comprises a sleeve body, and a spiral glue adding groove is formed in the inner wall of the sleeve body. The whole cable accessory is made of the LSR liquid silicone rubber; after the sealing part is wrapped at the lap joint position of all the components, the waterproof sealant is used for enabling the components to form a whole, external moisture or vapor is prevented from invading, sealing and waterproofing are more stable and reliable, and therefore breakdown accidents caused by moisture or vapor invading of cable accessories are effectively avoided.

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.

A sleeve tube or line clamp for crimp connection of power transmission lines has a pile-shaped main body with cross section of open 8 shape or H shape, and two line channels at both ends. Both line channels are isolated from each other by partition. On the surface of main body, there are cancave and / or convex locking dots or locking slots and / or ridges. Its advantages are tight connection, great pull force, and low contact resistance and temp raising.

The invention relates to an anti-interference method for on-line partial discharge monitoring of a large generator, comprising the steps of: 1) installing a VHF capacitive sensor at the three-phase outlet bus of the generator, installing a high-frequency current sensor on the neutral point grounding line, and installing a VHF capacitive sensor Both the sensor and the high-frequency current sensor are connected to the partial discharge monitoring device through a high-frequency coaxial cable; 2) Use the analog partial discharge pulse generator to connect the discharge pulse at different positions, start the monitoring host, and send commands to the partial discharge monitoring The device collects all sensor signals synchronously, finds the corresponding pulse of the high-frequency current sensor channel at the same time according to the pulse of the VHF capacitive sensor channel, and determines the position of the pulse discharge source through the pulse polarity of the two signals. The beneficial effect of the invention is that it can effectively filter out various pulse interferences from the direction of the ground wire and the direction of the high-voltage bus, especially various random pulse interferences which are most difficult to filter out.

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.

The invention relates to the technical field of cable accessories, and provides a 27.5 kV semi-rigid thermal shrinkage cable terminal for a high-speed rail. The terminal comprises a cable sheath layer, a cable shielding layer exposed by stripping the cable sheath layer, a cable semi-conductive layer exposed by stripping the cable shielding layer, and a cable insulating layer exposed by stripping the cable semi-conductive layer. A stress tube is arranged on the peripheries of the cable insulating layer and the cable semi-conductive layer, an insulating tube I is arranged on the peripheries of the stress tube and the cable shielding layer, a nonlinear resistance tube is arranged on the periphery of the insulating tube I, an insulating tube II is arranged on the periphery of the nonlinear resistance tube, and a glass fiber curing layer is arranged on the periphery of the insulating tube II. The terminal has the advantages that the stress tube, the insulating tube I, the non-linear resistance tube and the insulating tube II form a composite insulation structure, and breakdown accidents caused by increase of partial discharge can be effectively avoided; and the glass fiber curing layer forms a stress control reinforcing band so that the thermal shrinkage cable terminal obtains relatively high rigidity and is effectively prevented from being influenced by high-frequency vibration.

The invention discloses online monitoring method of the insulation state method for crossing polyethylene insulated power cable that adopts DC superposing method to take online testing for the three phase XLPE power cable. After gaining the parameters, GPRS would send it to host computer, which would take analysis to the data and judge the insulation state. The invention realizes unattended operation online monitoring and wireless remote controlling and measuring.

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 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.