37results about How to "Solve breakdown problem" patented technology

The invention relates to a portable oxygen generator self-adaptive to altitude and an oxygen generation method. The oxygen generator comprises a compressor, an oxygen generation unit, an oxygen buffertank and a control unit, wherein a flow sensor is arranged behind the compressor; the compressor and the flow sensor are connected with the control unit; the flow sensor is used for monitoring the output flow value of the compressor in real time and transmitting an output flow value to the control unit; a compressed air flow threshold value required by a current oxygen production amount is storedin the control unit; the control unit is used for receiving the output flow value, monitored in real time, of the compressor, comparing the output flow value with the compressed air flow threshold value, and conducting PID closed-loop feedback according to a comparison result to adjust the rotating speed of the compressor until the output flow value is matched with the compressed air flow threshold value. According to the invention, the problems of insufficient flow of the compressor caused by elevation of the altitude and inflow air breakdown of the oxygen generation unit caused by overlargeflow of the compressor due to reduction of the altitude can be fundamentally solved, and self-adaption to altitude is realized.

The invention relates to modified silicon oil for an oil type antioxidant thin film of a metalized capacitor and relates to the technical field of capacitors. The thin film is prepared from the following components in parts by weight: 35-45 parts of methylsilicone oil, 4-6 parts of diphenyldimethoxysilane, 1-3 parts of epoxy resin, 4-6 parts of peanut oil, 4-6 parts of methyltrissilane, 1-2.5 parts of a coupling agent, 2-3 parts of paroline, 2-3 parts of hexamethyldisiloxane and 2-3 parts of a crosslinking agent. The modified silicon oil provided by the invention is simple in component, low in cost, non-toxic and free of corrosion and impurities and has a good using performance. A silicon oil protective layer is arranged on the whole metal layer to be isolated from air to prevent aluminum and zinc from being oxidized by air, so that the oxidation resistance of the metalized thin film is improved and the thin film is prevented from being oxidized and broken down in the process of manufacturing a capacitor, thereby greatly improving the quality of the capacitor which is manufactured by using the metalized film. Meanwhile, the problem that a large-capacity capacitor is too large in capacity and heat is hard to emit so as to lead to breakdown is solved. The oil protective layer has the compact binding and radiating functions and is capable enhancing the firmness among the plated layers, so that the metal layer is effectively prevented from falling.

The invention relates to the technical field of accessories of crosslinked polyethylene insulated power cables, and discloses a preparation method of an integrally prefabricated intermediate joint. The method comprises the following steps: injecting semi-conductive rubber into a mold by using a rubber injection machine to prepare stress cones at two ends and a high-voltage shield in the middle, injecting the semi-conductive rubber into the mold by using the rubber injection machine to prepare a stress cone insulation shield, and finally injecting insulation rubber into the stress cone and theinsulation shield to prepare the intermediate joint. According to the method, the die assembly seam on insulation is avoided, the problem caused by the fact that the shielding layer is thin is solved,the insulation performance is well guaranteed and the service life is longer.

The invention relates to a low-loss metallized film, comprising a dielectric base film, on which a silver-zinc-aluminum composite metal layer is arranged, and an aluminum-plated layer is provided on the surface of the silver-zinc-aluminum composite metal layer, The surface of the aluminum plating layer is provided with a carbon nanotube layer, the surface of the carbon nanotube layer is provided with a sealing oil protective layer, the medium base film is a polypropylene film or a polyolefin film, and the material of the sealing oil protective layer is Methyl silicone oil; the metallized film of the present invention has high anti-oxidation ability, avoids the film being oxidized and broken down in the process of making capacitors, and the loss of the metal layer is low. The problem of wearing. The invention also discloses a processing method for the above-mentioned low-loss metallized film.

The invention relates to the technical field of high-voltage power cables, in particular to a novel semi-conductive non-water-blocking buffer cushion layer high-voltage power cable. Comprising a conductor, a wrapping semi-conductive nylon tape, an ultra-clean XLPE insulating layer, a semi-conductive non-water-blocking buffer tape, a corrugated aluminum sheath, cable asphalt, an insulating outer sheath and a graphite coating are sequentially arranged outside the conductor, and an ultra-smooth semi-conductive layer is arranged between the inner layer of the ultra-clean XLPE insulating layer and the wrapping semi-conductive nylon tape. And an ultra-smooth insulation shielding layer is arranged between the outer layer of the ultra-clean XLPE insulation layer and the semi-conductive non-water-blocking buffer strip. The cable can effectively solve the problem of body breakdown caused by corrosion of white substances generated by water absorption of water-blocking powder in the industry, and improves the use safety and reliability of the high-voltage power cable.

The invention discloses a grid electrode protection circuit for field effect transistors connected in series. The grid electrode protection circuit comprises a circuit formed by series connection of more than one field effect transistor, grid electrodes of the field effect transistors are connected with a diode in series, a negative electrode of the diode is connected with the grid electrodes of the field effect transistors, a positive electrode of the diode is connected with a grid electrode control signal input terminal provided by the circuit in a unified manner, an equalizing resistor is connected between a drain electrode and a source electrode of each field effect transistor in parallel, and a voltage-releasing resistor is connected between the grid electrode and the source electrode of each field effect transistor in parallel. According to the circuit formed by series connection of more than one field effect transistor, the grid electrode of each field effect transistor is connected with one diode in series except for the grid electrode of the field effect transistor at a grounding terminal so that the problem that when the field effect transistors connected in series are turned off, the grid voltage is above the limit and causes breakdown is solved, the high-voltage-resistant range of the field effect transistors is extended, and the circuit can be widely applied in the photovoltaic, wind energy, and power electronics fields.

The invention discloses a distributed level overvoltage control system and method. The system comprises a combined overvoltage protector, an energy absorber, a connecting electric reactor, a power unit, a power unit clamping voltage limiter, a laminated busbar and an IGBT induced voltage clamping device. After the energy absorber is subjected to parallel connection with the connecting electric reactor, one end of the energy absorber and the connecting electric reactor is connected with the combined overvoltage protector, the other end of the energy absorber and the connecting electric reactor is connected with the power unit, and the power unit clamping voltage limiter and the laminated busbar are respectively connected with the power unit. Five-grade defense is adopted in the distributed level overvoltage control system and method, overvoltage energy from various aspects can be suppressed, and damage to an IGBT caused by dangerous overvoltage of cut-off overvoltage, IGBT off-state overvoltage and the like of the device overvoltage invading the connecting electric reactor can be avoided, so that safe and reliable operation of an SVG device is ensured. The system and method are simple to operate and high in working efficiency and prolong the service life of the SVG device.

The invention discloses a method for controlling a permanent magnet synchronous motor with variable rotational inertia. The method is mainly to establish a variable rotational inertia factor parameter table by acquiring the variation factor information of the variable rotational inertia of the permanent magnet synchronous motor load, obtain its error information, and combine the actual The empirical parameters of the product are corrected and introduced into the control algorithm of the permanent magnet synchronous motor, which mainly includes the acquisition of the variable factor information parameter of the variable inertia, the variable inertia factor parameter table, the current parameter algorithm, the variable inertia electromagnetic torque algorithm, and the variable inertia. Laplace algorithm, variable inertia angular velocity algorithm, variable inertia control model. The invention can make the fan realize rapid speed convergence, greatly reduce the speed response time of the step response input, greatly shorten the establishment time of the speed stability, increase the anti-interference ability of the external load of the fan, and realize the downwind start and the headwind start. The anti-wind and stable speed operation during operation enhances the reliability and safety of operation.

The invention discloses a CVT capacitor online monitoring method based on CVT secondary voltage monitoring, and the method comprises the steps: S10, carrying out the parallel reading of at least one CVT secondary voltage value and a change speed through a plant station monitoring system, and setting a reference voltage; S20, carrying out the statistics of the duration time of all CVT secondary voltage changes, carrying out the filtering of the secondary voltages of all CVTs, and switching to step S30 if the secondary voltage change speed of one CVT is greater than a set change speed; S30, calculating the difference between the CVT secondary voltage value and the reference voltage: judging that the secondary voltage of the CVT is abnormal if the difference is greater than or equal to a first voltage threshold value or the duration time exceeds the set time, and switching to step S40; S40, judging whether the difference between the CVT secondary voltage value and the reference voltage is located between the first voltage threshold value and a second voltage threshold value nor not: judging the capacitor breakdown of the CVT if the difference is located between the first voltage threshold value and the second voltage threshold value. Through the CVT secondary voltage, the method can accurately judge the operation condition of a CVT capacitor, carries out deep processing through employing the data of the plant station monitoring system, does not need to add equipment, and improves the reliability.

The invention discloses a controllable silicon closing time prolonging control technology for a motorcycle fuel saving rectifier. The controllable silicon closing time prolonging control technology consists of a controllable rectifying part and a voltage stabilizing part, and is characterized in that the controllable rectifying part mainly comprises controllable silicon and a rectifying diode. When the voltage of a storage battery is up to the break-over voltage set by the voltage stabilizing part, the voltage of the control pole of the controllable silicon is reset, and the output current of the controllable rectifying part falls rapidly to a voltage stabilizing state; and if an electrical appliance is loaded at the moment, the voltage of the storage battery falls, the voltage at the control pole of the controllable silicon starts to rise, electric energy is absorbed by a delay capacitor, and the time of voltage rise is prolonged by 30 percent, so that the closing time of the controllable silicon is prolonged effectively, and the switching speed of the controllable silicon is lowered. Due to the adoption of the controllable silicon closing time prolonging control technology, the effect of prolonging the closing time of the anode and cathode of the controllable silicon is achieved, the overall temperature is lowered, and the engine fuel oil waste is reduced.

The invention provides a control method for a multilevel inverter, and is applied to a multilevel inverter circuit. The multilevel inverter circuit comprises a first capacitor, a second capacitor, a third capacitor and eight switching branch circuits. In the control method, when a wave enveloping signal is received, the third and fourth switching branch circuits are controlled to be switched on, and the other switching branch circuits are controlled to be switched off. No voltage is borne at the two ends in the third switching branch circuit by switching on the third switching branch circuit, and meanwhile, no voltage is also borne at the two ends in the fourth switching branch circuit by switching on the fourth switching branch circuit, so that the problem of switching tube breakdown caused by high voltage stress on a switching tube during wave enveloping in the prior art is solved. In addition, according to the scheme, after a preset time is reached, the third and fourth switching branch circuits are also controlled to be switched off to make the multilevel inverter in an off state.

The invention discloses a CVT capacitance on-line monitoring method based on zero sequence voltage monitoring. The method comprises the steps of: S10, parallelly reading the zero sequence voltage of at least one CVT by a plant station monitoring system, wherein the zero sequence voltage is normal if only deviating from normal values; S20, querying each CVT for detecting whether each zero sequence voltage exceeds a first voltage threshold, and for one CVT, if the zero sequence voltage thereof is larger than or equal to the first voltage threshold, entering a step S30; and S30, counting the abnormity duration time of zero sequence voltage of the CVT, judging whether the zero sequence voltage of the CVT exceeds a second voltage threshold, if the zero sequence voltage is smaller than the second voltage threshold and the duration time is larger than a first set time, then determining that the capacitance of the CVT is broken down. The operation condition of the CVT capacitance is accurately judged by the utilization of the zero sequence voltage of the CVT, deep processing is carried out by the utilization data of the plant station monitoring system, no equipment needs to be added, and the reliability is improved.

The present application discloses an organic optoelectronic device, comprising a substrate, and a first electrode layer, an organic functional layer and a second electrode layer sequentially formed on the substrate; There is an over-electric confinement layer in parallel with the organic functional layer, and the over-electric confinement layer is formed of a pressure-sensitive material. In the present application, an over-electricity limiting layer connected in parallel with the organic functional layer is provided between the first electrode layer and the second electrode layer of the organic optoelectronic device. The resistance of the electrical confinement layer becomes smaller, allowing the current to pass through the over-electric confinement layer without damaging the organic optoelectronic device. When the voltage returns to normal, the resistance of the over-electric confinement layer returns to infinity, and the organic optoelectronic device can work normally.

The present invention provides a PBT permanent antistatic material and a preparation method and application thereof, and the PBT antistatic material is prepared from 5-25% of flame-retardant electrostatic-conductive dissipative masterbatch and 75-95% of PBT. In the method, the flame-retardant electrostatic-conductive dissipative masterbatch and the PBT are blended and extruded to obtain the PBT antistatic material, the PBT antistatic material reaches high oxygen index flame retardant V0 level, the volume resistivity is 10<6-8> Omega, the surface resistivity is 10<6-9> Omega, and the electrostatic decay time is greater than 10s, so that breakdown and serious harm due to static electricity of products in the various fields can be solved, and the PBT permanent antistatic material is non-dependence on temperature and humidity, is widely used in intelligent micro-electronics, electrical appliances, electrostatic sheet packaging, wires and cables, optical photovoltaic solar energy, machinery, medical equipment, electrostatic textiles of clothing and shoes, fire protection, military electrostatic equipment, electrostatic explosion-proof industry, gas electrostatic protection safety, firework electrostatic protection safety, petroleum and chemical energy and gas station electrostatic protection, and other fields.

The invention belongs to the field of overvoltage protection, and particularly relates to a voltage-sharing element applied to power equipment and a design method of the voltage-sharing element. The problems of high research and development cost, long research and development period and the like caused by the fact that the structure of the current voltage-sharing element and the size matching of the current voltage-sharing element and power equipment are determined only by experience are solved. The voltage-sharing element comprises a barrel bottom and a barrel body; the barrel bottom is used for being electrically connected with a second conductor in the electrical equipment, the upper end of the barrel body is connected with the edge of the barrel bottom, the lower end of the barrel body extends towards a third conductor of an electrified part, and a radial gap is formed between the barrel body and part of the valve body close to the second conductor and is filled with an insulating medium; therefore, aging speed acceleration caused by serious heating in the operation process of the power equipment is prevented, and the operation safety and the protection reliability of the power equipment are greatly improved; meanwhile, by optimizing the effective height of the voltage-sharing element and the radial gap between the voltage-sharing element and the valve body, the discharge phenomenon between the valve body and the voltage-sharing element is avoided, and the protection reliability of the power equipment is further improved.