1796 results about "Ultra high voltage" patented technology

The invention discloses an intelligent fault classification and location method for an ultra-high voltage direct current transmission line, and belongs to the technical field of relay protection of power systems. The method comprises the following steps of: classifying fault data by using a neural network by adopting a layered and distributed neural network model; distinguishing fault types; sending the classified data into different neural networks respectively for performing fault location; when the direct current transmission line has a fault and a sampling frequency is 10 kHz, selecting a discrete line mode voltage signal which has the sampling sequence length of 100 after the fault and performing S-transform, wherein a transform result is a complex time-frequency matrix of 51*100; solving the modulus of each element in the complex matrix to obtain transient energy distribution of the line mode voltage at all frequencies; selecting first five energy spectrums as sample properties; selecting a transfer function and a learning rule; setting proper neural network parameters for constructing a BP network model; and performing fault classification and fault location. A large number of simulation results show that the method has a good effect.

The invention relates to a large multifunctional environmental simulator for electrical tests, which comprises an environmental stimulation chamber and is characterized in that an air heat-exchange circulation system and an ice-melting system are arranged in the environmental stimulation chamber; and the environmental stimulation chamber further comprises an ice-coating, rain-exposing and ultrasonic-atomizing system, a water treatment system, a heat-fogging system, a cooling water circulation system, a refrigeration system, a vacuuming and defogging system, a measurement and control system and an ultra-high voltage power supply system for providing a high-voltage charging state for test-pieces. By achieving the skillful coordination among the systems and the uniform operation control by the measurement and control system, the large multifunctional environmental simulator integrates various testing functions of environmental simulations, such as high-altitude, ice-coating, contamination, rain-exposing and other simulations into a whole. Therefore, the invention is widely suitable for the testing process for large multi-parameter environmental simulations.

The invention provides a three-dimensional visual processing method of an extra high voltage transmission line, which comprises the following steps: synchronously acquiring laser point cloud data and digital image data along a transmission line corridor through an airborne laser radar measurement system, and carrying out three-dimensional visual processing and professional analysis in combination of line design parameters and operating parameters after data processing and three-dimensional modeling so as to provide an efficient means for the maintenance and the management of the transmission line of an electric power enterprise. The invention further provides a three-dimensional visual processing system for the extra high voltage transmission line, which comprises a three-dimensional data generation module and a three-dimensional data visual operation module, wherein the three-dimensional data generation module is used for receiving digital image data and laser point cloud data obtained by the laser radar measurement system and generating the three-dimensional scene of the transmission line corridor; and the three-dimensional data visual operation module is used for carrying out three-dimensional visual operation on the three-dimensional data of the transmission line corridor.

The invention discloses a patrol robot system for an overhead high-voltage transmission line. The patrol robot system comprises a robot, the overhead line and a ground base station. The overhead line is supported through a cross bar. The robot comprises a robot body, a battery, a walking device, a single-chip microcomputer, a monitor device and a mobile communication device. The ground base station comprises a ground communication device and a ground monitor device. The ground base station and the robot are connected in a satellite communication mode. A robot platform is arranged on one side of the overhead line. The walking device comprises a walking mechanism and an obstacle avoidance mechanism. The walking device is connected with the single-chip microcomputer. The monitor range of the patrol robot is wider, environmental interference resistance is higher, the better obstacle avoidance mechanism is provided, a rest area is provided for the patrol robot, the service life of the patrol robot is prolonged, an automatic charging device is provided, work loads of workers are reduced, and the work of patrolling high-voltage lines and ultra-high-voltage lines can be completed excellently.

A dual current path LDMOSFET transistor (40) is provided which includes a substrate (400), a graded buried layer (401), an epitaxial drift region (404) in which a drain region (416) is formed, a first well region (406) in which a source region (412) is formed, a gate electrode (420) formed adjacent to the source region (412) to define a first channel region (107), and a current routing structure that includes a buried RESURF layer (408) in ohmic contact with a second well region (414) formed in a predetermined upper region of the epitaxial layer (404) so as to be completely covered by the gate electrode (420), the current routing structure being spaced apart from the first well region (406) and from the drain region (416) on at least a side of the drain region to delineate separate current paths from the source region and through the epitaxial layer.

An ultra high voltage MOS transistor device includes a substrate having a first conductive type, a first well having a second conductive type and a second well having the first conductive type formed in the substrate, a drain region having the second conductive type formed in the first well, a source region having the second conductive type formed in the second well, a first doped region having the first conductive type formed between the second well and the substrate, an insulating layer formed in a first recess in the first well, a gate formed on the substrate between the source region and the first well, and a recessed channel region formed in the substrate underneath the gate.

A semiconductor structure includes a semiconductor substrate of a first conductivity type; a pre-high-voltage well (pre-HVW) in the semiconductor substrate, wherein the pre-HVW is of a second conductivity type opposite the first conductivity type; a high-voltage well (HVW) over the pre-HVW, wherein the HVW is of the second conductivity type; a field ring of the first conductivity type occupying a top portion of the HVW, wherein at least one of the pre-HVW, the HVW, and the field ring comprises at least two tunnels; an insulation region over the field ring and a portion of the HVW; a drain region in the HVW and adjacent the insulation region; a gate electrode over a portion the insulation region; and a source region on an opposite side of the gate electrode than the drain region.

The invention discloses a method for producing a voltage-bearing aluminum alloy tank body of an ultra-high voltage switch by a V-process, comprising the following steps: model making, thin film heating, thin film shaping (film absorbing), coating spraying, sandbox placing, ram-jolting by adding sand , back film covering, film loosening, core setting, box folding, pouring, removing box and shaking out. After the process is improved, an intermediate frequency furnace is utilized to melt and a crucible heat preserving furnace is utilized to modify and refine. When melting in the intermediate frequency furnace, microelements such as tombarthite and the like are replenished and a new non-stirring melting and refining technology is adopted so as to reduce oxide inclusion content in alloy liquid. Modification and refining treatment in the crucible heat preserving furnace ensures high purity degree and high component precision of aluminum liquid, and using pure aluminum alloy liquid can increase the ratio of acquiring qualified pressure-proof tank body foundry products.

The present invention relates to movable robot mechanism, and is especially ultra high voltage power line polling robot mechanism. The polling robot mechanism consists of moving vehicle, back arm and front arm. The moving vehicle consists of vehicle body and walking wheel, the walking wheel is installed onto the vehicle body via horizontal rotation pair and moving pair and grasps the wire, and the vehicle body is connected via the rotation pair to the front arm and the back arm. The arm has hand claw in the end, the front arm and the back arm have the same structure, and each of the front arm and the back arm consists of two parts, upper arm and lower arm. The upper arm as one combined structure of link rod, ball lead screw and block is connected via horizontal rotation pair to the lower arm; and the lower arm is one great stroke telescopic mechanism. The present invention has great work space, light weight, low power consumption and powerful obstruction crossing capacity.

The invention discloses an inspection robot for ultra-high voltage power transmission lines, which is characterized by comprising a robot main body (3), walking and clamping mechanisms and a charging device, wherein the robot main body (3) has a framed box structure and comprises a control device, a detection device and a wireless image transmission device; each walking and clamping mechanism comprises a walking mechanism (1) and a clamping mechanism (6); two sets of the walking and clamping mechanisms are provided and are connected with the robot main body (3) by arms (5) having a structure of a hollow tube; and the charging device is positioned on the two sides of the robot main body (3) and connected with the robot main body (3) by a hinge (15). The inspection robot has the advantages of greatly improving the working efficiency and meeting requirements of specific robots for overhead operation, along with simple structure, easy implementation, light weight, safety, and environmental protection.

This invention relates to reclosing method for power transmission line. For joint parallel double circuit type: each circuit being equiped with individual protector, main protection being phase-splitting current differential protection or phase-command longitudinal protection; for various type single circuit fault or overline fault withni a zone, tripping fault being detected, determinnig no serious permanent fault, sequentially reclosing the tripping phases. For double-circuit fault, there must be two different type circuit being of no fault for reclosing, if not, two circuits must be tripped-off. This invention method increases the reclosing rate, together with minimizing the shock to the system after reclosing permanent fault.

To positionally stabilize the arc spot and to prevent the formation of so-called flicker, a super-high pressure discharge lamp which is filled with greater than or equal to 0.20 mg / mm3 of mercury has a feed device which supplies an alternating current with a steady-state operating frequency of from 60 Hz to 1000 Hz and a low frequency of from 5 Hz to 50 Hz. The feed device inserts the alternating current with the low frequency into the alternating current with the steady-state operating frequency with a time interval which has a length equal to at least one half period and at most to five periods, and the time interval being in the range of from 0.1 sec to 120 sec.

The invention relates to the production of electronic components, and discloses a method for forming anode foil for electrolytic capacitors. The ultrahigh-voltage anode foil is formed through six stages, wherein from the stage 1 to stage 5, each stage has a formation tank, and in the stage 6, three formation tanks are connected in parallel; and an acid fluid mixture containing a boric acid, a citric acid or an azelaic acid (the electric conductance and pH value thereof are adjusted by using carbon-containing inorganic salts) and ammonium hypophosphite or sodium monophosphate for improving the boiled performance of an oxidation film is filled in each formation tank. Correspondingly, the processing step is also adjusted, and the produced anode foil not only can be applied to the fields and industries of aerospace and automotive frequency converters and industrial frequency converters and the like meeting the ultrahigh voltage requirements on a withstand voltage of 700-1200V, but also is dense in oxidation film surface, high in specific volume and short in boosting time.

The invention relates to an ultra-high voltage direct current transmission line lightning stroke interference recognition method based on voltage relevancy and wavelet transformation transient state energy distribution characteristics, and belongs to the technical field of power system relay protection. When voltage of an ultra-high voltage direct current transmission line fluctuates, positive voltage and negative voltage of the initial 5ms are monitored; the relevancy between voltage of each electrode and voltage of each axis is calculated, and the lightning stroke interference is recognized according to the relevancy; the recognition of fault classifications is shifted to if the interference is caused by a fault; an additional component of line modal voltage is calculated, and seven dimension decomposition is performed on the additional component by utilizing a db3 wavelet; and the ratio of high frequency energy to low frequency energy is calculated, fault categories are distinguished, and fault protection is performed. According to the method, the signal acquisition time is short, the sample acquisition scale is small, and the voltage relevancy theory is used for recognizing lightning stroke interference and fault, so that the thought is clear, and the accuracy is high; the transient state energy distribution characteristics obtained through wavelet transformation are used for recognizing lightning stroke fault and short circuit fault, and the effect is obvious; and the method is easy to implement and is not easily influenced by system parameters and transition resistance.

The invention relates to a stability analyzing and optimizing method suitable for layering and zoning of an ultra-high voltage electric network, and belongs to the field of safety of the ultra-high voltage electric network. The stability analyzing method comprises an improved short-circuiting current level calculating method and an ANFIS (adaptive neural fuzzy interference system)-based safety domain optimum trend analysis. The invention also provides a stability optimizing method suitable for the layering and zoning of the ultra-high voltage electric network, and the stability optimizing method comprises the following steps of establishing a reactive optimizing model based on a layering and zoning strategy, adopting an improved genetic algorithm, and the like. The stability analyzing and optimizing method has the advantages that the stability of a receiving-end electric network is analyzed and optimized by the improved short-circuiting current level calculating method, the ANFIS-based safety domain optimum trend analysis and a reactive compensation optimizing method based on the improved genetic algorithm; the safe and stable running of the electric network can be ensured, and a quantitative support and decision reference is provided for a power company when the layering and zoning planning of a receiving-end system accessed with the ultra-high voltage is made; and the method is a reliable analyzing and decision-making method, and considerable technical benefits, economic benefits and social benefits can be created.

The invention relates to a method of a boundary element utilizing polar wave S transform energy ratio to determine ultra high-voltage (UHV) direct current (DC) transmission line faults, belonging to the technical field of power system relay protection. The method is as follows: a starting element is started when a DC line breaks down, the polar wave voltages of the positive and negative lines are calculated according to dipolar DC voltages and DC currents measured at a protective installation part; a discrete polar wave voltage signal the sampling sequence length of which is 200 after faults is subjected to S transform, the transform result is a 101*200 time-frequency complex matrix, and mode operation is carried out on each element in the complex matrix. High-frequency component and low-frequency component of the polar wave voltage are extracted according to the obtained modular matrix, and then the ratio of the high-frequency energy to the low-frequency energy of the polar wave voltage is figured out; and whether the fault is interior or exterior is distinguished according to the value of the ratio of the high-frequency energy to the low-frequency energy. A large number of simulation results show that the invention has good effect.

The invention provides a laser radar-based intelligent early-warning evaluation method for a power transmission line. The method comprises the following steps: information obtaining of the power transmission line, three-dimensional graphic modeling of the power transmission line, data analysis and judgment, and early-warning and power transmission line security evaluation. High-density and high-precision laser radar point cloud and optical image data on an ultra-high-voltage or high-voltage power transmission line are obtained by a laser radar scanning system carried by a helicopter platform; rapid high-precision three-dimensional measurement and spatial analysis of the power transmission line are achieved; and the analysis is applied to specific inspection and management work, such as sag calculation, line windage yaw check after three-dimensional modeling and line hazard analysis, in power transmission line operation and maintenance. The invention further provides a laser radar-based intelligent early-warning evaluation system for the power transmission line. The system comprises a power transmission line information obtaining unit, a data processing unit, a data storage unit and a feedback unit. According to the system, inspection and early-warning of the power transmission line can be rapidly and accurately achieved; and a safety evaluation report can also be provided to a user.

The invention discloses working electrolyte of a 650V-700V extra-high-voltage aluminum electrolytic capacitor. The working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor comprises, by weight, 45-65% of primary solvents, 5-20.5% of secondary solvents, 10-20% of solutes, 8-25% of spark voltage improvers, 5-10% of stabilizers, 0.2-3% of hydrogen absorbents, and 2-5% of other additives. The invention further discloses a preparation method of the working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor and the 650V-700V extra-high-voltage aluminum electrolytic capacitor. According to the 650V-700V extra-high-voltage aluminum electrolytic capacitor, the working electrolyte and the preparation method of the working electrolyte, the spark voltage improvers and the stabilizers within the reasonable ranges are used, the high-voltage resistance and high-temperature resistance of the electrolyte are improved, and meanwhile the working electrolyte has low gas production performance. When the aluminum electrolytic capacitor with the electrolyte is subjected to a ripple current life test at 85 DEG C for 2000 hours, the aluminum electrolytic capacitor can resist the voltage of 650-700V and even higher voltage, and a breakdown phenomenon caused by unstable spark voltage of the electrolyte is avoided.

To stabilize the arc bright point position of a discharge lamp and suppress deformation of an electrode when an ultrahigh-pressure discharge lamp is operated with extremely low electric power, the lamp is operated by supplying power from a power supply device having a step-down chopper circuit and a full bridge circuit, a rectangular wave alternating current being supplied when it is operated with rated power or dimmed power (about 60 to 80% of rated power), a DC current being supplied during standby power operation of at most 0.5×P (W) with respect to the maximum operating power P (W). Moreover, the high-pressure discharge lamp light source device may be mounted on a projector for projecting images and the mode being changed to standby power operation when there is no change in an image signal, for example, for a prescribed period of time.

The invention discloses a manufacturing method of ultra-high voltage insulation cooked mica paper, and aims to solve the problem that the mica paper prepared by the existing raw powder technique is not applicable to large-size power equipment. The method disclosed by the invention comprises the following steps: screening the mica raw material, calcining at high temperature, screening, dipping, making cooked mica pulp, manufacturing paper with the pulp, drying and the like. The mica paper produced by the method disclosed by the invention has the characteristics of high electric strength and high tensile strength.

The invention relates to extra-high voltage transformer oil and a production process thereof. The extra-high voltage transformer oil comprises the following components in percentage by weight: 75wt%-85wt% of naphthenic-base base oil, 12wt%-22wt% of dodecyl benzene, 10ppm-200ppm of a metal de-activating agent and 0.1wt%-3wt% of a light stabilizer. Compared with the prior art, the extra-high voltage transformer oil is low in cost, simple in formula and production process, convenient to use, excellent in comprehensive performances and in particular suitable for being used as extra-high voltage transformer oil.

The invention relates to a double 12-pulse valve bank coordinated-control method for an ultra-high voltage direct-current transmission system. The method is realized in a way that: two valve banks at each pole are connected in series, one ends are connected with each other, and the other ends are respectively connected to an polar high voltage bus and a polar neutral bus; the pole control system is divided into a dipole\pole control layer and a valve bank control layer, the valve bank control layer realizes trigger control on the high-voltage valve bank and the low-voltage valve bank, each valve bank control only collects the respective 12-pulse valve bank conversion flow bus voltage as the synchronous voltage of the trigger pulse, the trigger angle of the two 12-pulse valve banks in series can be adjusted to maintain the direct-current current and the direct current voltage, and the trigger angle between the valve banks in series can be coordinated and controlled to realize balanced operation of the valve banks in series; and the dipole\pole control layer generates a current command and simultaneously transmits the current command to high voltage and low voltage, i.e. master-slave valve bank control. The invention solves the problems of trigger angle deviation of high-voltage valve bank and low-voltage bank in series, and unbalanced voltage distribution caused by competitive control between valve banks in series, measuring errors and other factors.

The invention relates to an ultra-high-voltage direct-current transmission line neural network double end fault location method based on the high frequency amount attenuation characteristic, and belongs to the technical field of relaying protection on high-voltage direct-current transmission systems. According to the method, on the basis of the attenuation characteristic generated when faults are spread on a line with high frequency amount, the mathematic relations between the fault distances and the ratio of a head wave amplitude value of a traveling wave of a fault voltage reaching a rectifying side range unit to a head wave amplitude value of a traveling wave of a fault voltage reaching an inversion side range unit are derived; the ratio of head wave amplitude values of traveling waves of fault voltages detected by rectifying side range units in different frequency bands to head wave amplitude values of traveling waves of fault voltages detected by inversion side range units in different frequency bands are selected to serve as an input sample set of a BP neural network, the fault distances serve as an output sample set, the neural network is trained to generate a fault location neural network model; after the fault location neural network model is formed, testing samples are input the trained model to obtain the fault location result. The method avoids the problem that wave speed is difficult to determine with a traditional double-end traveling wave fault location method.

The invention provides a production method for a crosslinked polyethylene insulating power cable for an ultra-high voltage aluminum core segmental conductor, relating to a production method for a large-section crosslinked cable. In the invention, single lines are intertwisted together in a layered way, the crosslinked polyethylene insulating power cable is formed under the action of a special-shaped press roll, and five strand blocks which are pretwisted are respectively processed. Aiming to the condition of low aluminum wire elongation, and by putting time and energy in technical processing, the invention is changed from tightly pressing only one press roll in the layered way originally to respectively and tightly pressing equipment, and two special-shaped press rolls are added on the basis of the original equipment, thereby deformation of each single line for three times divided from compress deformation for one time is realized, the deformation rate of each single line for one time is reduced, the difficulty of the processing technology is greatly lowered, and the weakness of lower aluminum wire elongation is overcome.

In an ultra high voltage lateral DMOS-type device (UHV LDMOS device), a central pad that defines the drain region is surrounded by a racetrack-shaped source region with striations of alternating n-type and p-type material radiating outwardly from the pad to the source to provide for an adjustable snapback voltage.

The invention relates to the technical field of measuring parameters of a transmission line of a power system, in particular to a method for measuring positive sequence parameters of an ultra-high voltage transmission line based on double end measuring information. The method comprises: measuring positive sequence impedance and positive sequence capacitance of the transmission line; when measuring the positive sequence impedance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase short connection to the tail end of the transmission line, adding athree-phase voltage on the front end of the transmission line; when measuring the positive sequence capacitance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase opening to the tail end of the transmission line, adding the three-phase voltage on the front end of the transmission line; using a global satellite positioning system technology to simultaneously measure the three-phase voltage on two ends of the transmission line and the three-phase current on two ends of the transmission line, and synchronously sampling the three-phase voltage and three-phase current. The method in the invention solves the influence of the distributed capacitance on the transmission line to the positive sequence parameters measurement so as to greatly increase the precision of the positive sequence parameters measuring result of the transmission line.

The invention discloses an intelligent self-healing monitoring method of extra high voltage power network, belonging to the field of electric transformer and distribution. The invention uses the self-healing monitoring method that the power network control center collects the fault information, estimates the fault point according to the action information, judges the fault point according to the visualization technology, and starts the automatic recovery project. The method solves the self-healing problem of extra high voltage power network, performs the prevention and correction control, andmakes the dispose strategy based on the information quickly, thereby avoiding the cascade trip caused by load transfer, realizing the safe and stable addition control of the power network from the entire network perspective, and replenishing the disadvantages of area and in situ emergency control measure. Aiming at the specific characteristics in the aspects of running, dispatching and managing of the extra high voltage power network, the method can collect and use the information more comprehensive, and make the dispose strategy quickly to earn the time for the avoiding of cascade trip caused by load transfer, thereby avoiding the further enlargement of fault coverage due to wrong dispose, and solving the self-healing problem of the extra high voltage power network.

The invention provides an ultrahigh voltage BCD process which can be used for realizing integration of a plurality of semiconductor devices. An ultrahigh voltage BCD device comprises a high-voltage LDMOS (Laterally Diffused Metal Oxide Semiconductor) manufactured on an N-type extension, a high-voltage floating tub structure, a low-voltage PMOS (P-channel Metal Oxide Semiconductor) transistor, a low-voltage NMOS (N-channel Metal Oxide Semiconductor) transistor, a low-voltage VNPN transistor, a VDNMOS, a Zener diode, a low-voltage NLDMOS, an LPNP, and a symmetrical drain extension EDPMOS. The process has an N-type buried layer which penetrates through a P-type substrate and an N-type extension, a PN junction through isolation structure is formed between the high-voltage structure and the low-voltage structure. The high-voltage BCD process integrates devices of a plurality of voltage levels, wherein the high-voltage floating tub structure can provide process platform support for application of a bridge type circuit.