44results about How to "Reduce inductive reactance" patented technology

The related information of the transient zero sequence voltage and the transient zero sequence current caused by the fault are chosen as the reference for selecting the detective line and the subsection. The judgement is based on the components with the capacitive constraint relation in the transient zero sequence voltage and current caused by the fault. The defective line and the subsection are determined based on the reactive power and the direction in the transient signals. The invention is suitable to the system in which the neutral point is not connected to the ground, the arc-extinguishing coil is connected to the ground and the high-ohm resistor is connected to the ground. The invention possesses the features of no influence of the flash trouble and the self-determination without need of the defective information of other lines.

The present invention is related to a coplanar coupled-fed multiband antenna for the mobile communication device. The antenna mainly comprises a dielectric substrate, a ground plane located on one surface of the dielectric substrate, and a radiating portion, a shorting metal portion, and a feeding portion, which are all on the same surface of the dielectric substrate near one edge of the ground plane. One end of the shorting metal portion is connected to the radiating portion, and the other end is connected to the ground plane. The feeding portion comprises a first feeding metal portion and a second feeding metal portion. The first feeding metal portion has a feeding point for the antenna. One end of the second feeding metal portion is connected to the radiating portion, and there is a gap between the second feeding metal portion and the first feeding metal portion.

The invention relates to a construction method for heating ultra-high voltage transformer oil with a low-frequency current short circuit method. According to the method, the ultra-high voltage transformer oil is heated by using the low-frequency current short-circuit method, the working voltage of short circuit heating is reduced by reducing the inductive impedance of a transformer winding so as to shorten temperature rise time and drying treatment time, and research achievements are applied to ultrahigh and extra-high voltage transformer fields to reach the effects of heating and drying the transformer oil. The interior of the winding is heated, an insulator of a transformer body is uniformly heated to an appointed temperature internally, and then moisture inside the insulator is taken out through vacuum pumping and hot-oil circulation treatment, so that a drying effect is reached. According to the short circuit method, the winding is heated from the interior of the body, so that the efficiency can be improved, the heating time is shortened, and the drying effect of the body is superior to an ordinary hot-oil circulation effect. Used equipment and wiring are completely the same as those of a transformer load test.

The invention relates to a high-frequency intelligent response electro-desalting power supply device to solve the problems of high consumption of electricity for refining crude oil, reduction of electric field strength, low effect of electric desalting and dewatering, and the like due to increase of electric field current when the crude oil with high water content, high conductivity or severe emulsification is treated through the conventional electric desalting and dewatering. The high-frequency intelligent response electro-desalting power supply device comprises an electric desalting and dewatering pot, an in-pot electrode plate, a high-frequency intelligent response control cabinet (comprising a bridge rectifier, a capacitor filter, an insulated gate bipolar translator (IGBT) module, a programmable logic controller (PLC) control protection circuit and a current and voltage monitoring circuit), and an explosionproof high-frequency transformer. According to properties of different oil products, different frequencies are selected, and the aim of breaking emulsion is fulfilled under lower electric field strength; therefore, the current is reduced and electric energy is saved.

The invention discloses a low-inductance and high-electro-optical-conversion-efficiency vertical cavity surface emitting laser (VCSEL) packaging structure. An N surface light emitting VCSEL laser chipand a P surface light emitting VCSEL chip are packaged in series to reduce packaging leads between electrodes, reduce inductance of the loop and raise the rising edge of the optical pulse. The laserresistance is increased by using the form of series packaging so that the laser chip obtains more voltage drop in the driving loop, correspondingly the voltage drop of other electronic components in the driving loop is reduced and the power consumption of other electronic components is reduced. Furthermore, the loop inductance can be further reduced and the rising edge of the laser optical pulse signal can be raised by parallel connection of two groups of the laser series packaging structures.

The invention provides a graphite composited overhead ground wire and a preparation method thereof. The graphite composited overhead ground wire comprises an inner core composed of a first composited graphite line, a secondary outer layer which is formed by lengthways arranging second composited graphite lines about the outer side of the inner core, and an outermost layer which is formed by knitting metal fibers about the secondary outer layer; the secondary outer layer completely wraps the inner core, and the outermost layer completely wraps the secondary outer layer; the first composited graphite line is prepared by intertwining composited graphite strips; the second graphite lines are prepared by intertwining the composited graphite strips about the metal fibers; each composited graphite strip comprises two vermicular graphite layer, a framework fiber and a carbon fiber, wherein the framework fiber and the carbon fiber are paved between the two graphite layers and are wrapped with adhesive layers. The graphite composited overhead ground wire has the advantages of being light in weight, low in resistance, low in inductive reactance and low in surface effect; the graphite composited overhead ground wire can be matched with an arrester so as to expand the lightning protection range of the overhead ground wire; in addition, the process is simple, the cost is low, and the engineering application effect is obvious.

The invention relates to a novel surge protection device and belongs to the field of lightning protection. The novel surge protection device is mainly composed of a surge suppression device, a light measuring unit, a signal conversion and transmission unit, a control unit, a short circuit protection module, a pedestal and a shell; the light measuring unit is opposite to the surge suppression device, the light measuring unit is connected with the signal conversion and transmission unit, the control unit is connected with the signal conversion and transmission unit, and the short circuit protection module is connected with the control unit. The novel surge protection device is capable of detecting lightning surge which flows through the surge suppression device and the degradation or damage situation of the surge suppression device in real time and timely controlling the short circuit protection module to separate the surge suppression device from circuit so as to facilitate changing and maintaining in advance; because the connecting circuit length and inductive reactance are reduced, the whole protective performance is improved; the novel surge protection device can be used for protecting power supply circuits, signal circuits, control circuits and the like circuits.

The invention discloses a multi-path parallel ultra-high-speed low-voltage high-current pulse type constant current source, relates to the technical field of power supplies, and aims to solve the problem of how to design a multi-path parallel high-speed high-current pulse type constant current source with the output current reaching a kiloampere level and the pulse rising speed at a microsecond level. Through independent control of multi-path output, a DSP controller sends out SPI signals, sends out the same given pulse signals in a unified mode and inputs the same given pulse signals to a pulse signal generation source circuit, and current equalization of a constant current source is guaranteed. A plurality of Hall current sensors of a main circuit respectively sample output currents of the emitters of a plurality of IGBT as feedback signals and input the feedback signals to the pulse constant current source control circuit for comparison with the given signals in order to control thedriving voltage, so that the plurality of IGBTs in the main circuit all work in a linear region, the output current and the pulse width are controlled, and constant-current output is achieved. The control signal EN uniformly controls the on and off of the pulse signal through the same I/O port, thereby guaranteeing the consistency of the rising edge time sequence of the control signal, achievingthe parallel connection of a plurality of IGBTs, and enabling the output current to reach a kiloampere level.

The invention relates to an ore furnace electricity-saving method comprising the following steps: a. performing optimum setting to parameters of various types of furnace, the setting also comprising adjusting of the melting chamber diameter, controlling of electrode gaps, therefore, obtaining a practical and scientific configuration of network voltage and the equipment itself; b. improving current work utilization ratio by using a voltage work method and the technical requirement, increasing the ratio of voltage and current, maintaining the ratio of voltage and current at 1:280, reducing the generation of impedance and inductive reactance of ore furnace, and obtaining a power factor over 0.9; c. improving transmission capacity of the short net, namely, increasing the control voltage and reducing the current.By using the method, production energy-consumption can be reduced effectively, the power factor can be improved and the quality of products can also be improved.

The invention discloses a capacity adding craft method of the closed calcium carbide furnace, including a furnace body and the furnace lid of the top furnace, the furnace bottom installs the released mouth, the lid installs the electrode, feeding mouth, the electrode connects to the electric furnace transformer with the soft water cables, short network, the top of feeding mouth connects to a ring feeding machine, the capacity adding method of the closed calcium carbide furnace is: increasing the current rating of the first current and the secondary current, the capacity of electric transformers increased to each not less than 10,000 KVA; the height of lid increased to 1,300 to 1,500 MM. the low pressure outline port of the secondary short net in the short net changed to the intercross outline port. Reduced the distance between the electric furnace transformer and the wall of the electric furnace workshop and shortened the length of short network copper pipe. The invention increased the load, production and extended the use life of the furnace transformer; after the lid being heightened, it plays a stabilizing furnace pressure and extends life expectancy effect.

The invention discloses a medium-frequency coiling soft cable for a charging smart energy airport and a production process thereof. The medium-frequency coiling soft cable comprises a main cable core,and a non-woven winding layer, an inner lining layer, an aramid fiber weaving layer and a protection case which are wrapped outside the main cable core, wherein three power cable cores are arranged in the main cable core by 120 degrees; power assisting cable cores are arranged among power cable cores; control beams are arranged among adjacent power cable cores and power assisting cable cores; andconductor beams comprise a plurality of conductors which are distributed along the circumferential direction of the power cable cores. The cable is small in floor space, and has high flame retardance, superior tension resistance and torsion resistance. The conductors are uniformly arranged in the power cable cores, so that the magnetic fields can be counteracted with each other to lower the induce, thereby enhancing the electrifying performance.

The invention provides a pulse harmonic signal direct current transformer error detection device. The device comprises a direct current and pulse harmonic current output module and an external detected input module, wherein the direct current and pulse harmonic current output module outputs direct current and direct current superposition pulse harmonic current to an internal sampling circuit and a self-calibration standard resistor array; the internal sampling circuit converts the input direct current and direct current superposition pulse harmonic current into voltage signals, and sends the voltage signals to an AD sampling measurer through a front-end conditioning circuit and a detected input channel. According to the error detection device, a standard resistor array with high accuracy, good long-term stability and small inductive reactance is used as a traceability standard, accuracy of a direct-current transformer and a direct-current amplifier under direct-current and direct-current superposed pulsation harmonic signals is detected, and self-calibration of direct-current and pulsation harmonic signal measurement is completed on a test site.

The invention discloses a vibration exciter which comprises a coil assembly and a magnetic circuit assembly. The coil assembly comprises a coil, an installation space is defined by the coil, the magnetic circuit assembly is located in the installation space, and the magnetic circuit assembly comprises a center washer, a magnetic insulation conductive frame and a magnet. The magnetic circuit assembly comprises a central washer and magnets, the magnets are arranged on the two sides of the central washer in the axial direction of the coil, the magnetic poles of the two faces, close to the central washer, of the magnets are the same, the magnetic insulation conductive frame is arranged on the outer side of the central washer in a sleeving mode, and a gap exists between the coil assembly and the magnetic circuit assembly. According to the technical scheme, high loudness can be obtained at a high frequency band, and the sounding effect is improved.

A stacked output structure of a capacitive power supply for welding equipment, having a plurality of capacitors to be connected in parallel, two electrodes of each capacitor are respectively provided with a pin including a long pin and a short pin; at least two PCB bus plates placed in stack are provided above the capacitor is provided. A lower PCB bus plate is connected with the short pin; and a pass-through hole is provided, at a position corresponds to the long pin, on the lower PCB bus plate. The long pin passes through the pass-through hole in the lower PCB bus plate and is connected with an upper PCB bus plate. There is a gap between the long pin and an inner wall of the pass-through hole.

The invention relates to a server conversion system for converting a PCIE interface into SATA interfaces. The server conversion system is characterized by comprising a conversion control circuit, the control circuit comprises a main control chip and a memory chip; the main control chip is connected with the memory chip, and is also connected with the SATA interfaces and the PCIE interface. One PCIE interface is converted into two SATA interfaces, digital power in design is close to a pin of the main control chip to reduce inductive reactance, the use ratio of a server can be increased through the low cost, it is achieved that the memory capacity is greatly improved, and meanwhile a simple data conversion device can be provided for design test and verification of a laboratory.

An electric generation method for the permanent-magnet electric generator for car and its equipment is disclosed. Multiple groups of windings with different numbers of turns are wound on the stator core. The windings with more turns can output current at lower speed and the windings with less turns can output current at high speed. It features generation of a certain current during low speed and generation of some current large enough during high speed.

This invention relates to a power supply process circuit including a rectifying and filtering circuit rectifying and filtering AC commercial power to get stable pulse DC power, a start-up protection circuit, a phase-change circuit and a bridge self-oscillation circuit connected with the rectifying and filtering circuit, in which, the pulse DC power is loaded on said start-up protection circuit and th balance bridge circuit to start up the phase-change circuit by the start-up protection circuit to further start up the bridge self-oscillation circuit to amplify and filter the pulse DC power loaded on itself, then the feed-back winding of the phase change circuit is coupled with the self-oscillation circuit to get electric signals, and the phase-change circuit loads said signals on the bridge self-oscillation circuit to control and balance the bridge circuit to amplify and filter the DC power loaded on itself.

The invention relates to a current output mechanism and a test device. The test device comprises a current booster and the current output mechanism. An input terminal of the current booster is connected with an external power supply, and an output terminal of the current booster is connected with the current output mechanism; the current output mechanism comprises a first output unit and a second output unit, a containing cavity is defined by the first output unit, the output end of the second output unit is inserted into the containing cavity, the output end of the second output unit is connected with the inflow end of the first output unit, and the first output unit and the second output unit jointly form a closed loop; the second output unit is used for being matched with the first output unit to shunt the current in the closed loop; by arranging the first output unit and the second output unit, current shunting in the closed loop is realized, so that resistance and inductance in the closed loop are reduced, inductive reactance of the closed loop is further reduced, and apparent power of the power supply is reduced.

The invention relates to a three-color display electricity demonstrator and belongs to the field of teaching instrument demonstration. The three-color display electricity demonstrator comprises a test hole, a test source, an operational amplifier section, an operational amplifier integrated switch, a stepped comparison and amplifier section and a display system. The test hole is connected to the object to be measured; under the operation of the operational amplifier integrated switch, the test source are formed into two test sources of frequency and non-frequency; after amplification of the operational amplifier section, the stepped comparison and amplification section can be reliably started, and the display system is displayed by the display system. The three-color display electricity demonstrator is characterized in that the integrated operational amplifier is used as a basic active component, and the logic relation of various functions can be formed; a strong understanding of the close connection between the structure of the resistance components can be emphasized so as to understand the significance of capacitance and reactance and to lay a certain electrical basis for beginners. In the display system, three types of instructions are included in the display system, namely three-color marking instruction, a double color common cathode light emitting tube and a speech sensor positioned in a display basic unit. The three-color display electricity demonstrator has the advantages of dynamic strong sense, bright colors and strong interest, and being capable of cultivating the majority of young people's love of science.