164results about How to "Reduced insulation requirements" patented technology

The invention discloses a gravity inductive type axis-counting device and a method for detecting the state of a tract district thereof, relating to a railway transport management device and a management method thereof. The gravity inductive type axis-counting device comprises an axis detector, an axis-counting information processing system, an input-output subsystem and a power supply, wherein the axis detector is composed of a wheel electronic detector and a gravity inductive type sensor unit; the wheel electronic detector consists of an axis-counting CPU unit, a signal processing unit, a sensor power unit and a state detecting unit; the axis-counting information processing unit comprises a CPU unit, a communication unit, and an I/O unit; and the input-output subsystem consists of a dynamic drive assembly unit, a relay and a button. In the method, a wheel signal is detected by a gravity inductive type sensor arranged on a rail, and is transmitted to the wheel electronic detector and the axis-counting information processing unit for processing, thus judging the state of the tract district. The invention has the advantages of accurate detection result, high reliability, scientific method and capability of realizing automatic judgment on the idle and occupied states of the tract district.

A current transformer for energy conversion in a super-conductive energy storage system utilizes a two-stage boost-chopper to fulfill boost control for discharge process in super-conductive energy storage magnets. The first stage of the chopper circuit adopts a plurality of metal oxide semi-conductor field-effect transistors in parallel connection, so that the voltage on both ends of a super-conductive magnet can be limited in a rather low voltage level to meet the insulation requirements of the super-conductive magnet. The second stage of the chopper circuit increases the voltage to a higher level, and utilizes IGBTs as switch components to regulate subsequent output voltage through adjusting the switch duty cycle of the IGBTs through a PWM control mode, so as to fulfill the adjustable target for subsequent output voltage and the controllable target of the super-conductive magnet discharge voltage. The invention can realize energy output in the super-conductive energy storage magnet in a constant-voltage and DC mode, in order to meet the requirements for subsequent voltage-type loads. Meanwhile, the output voltage of the current transformer is not limited by insulating strength of magnets, but can fulfill flexible regulation according to subsequent load, and meanwhile, avoid the large volume problems with transformers or the multiple circuit topology structure.

The invention provides an isolation double-stage chain type current transformer applied to energy storage of a high-capacity battery. A bidirectional isolation full-bridge current transformer with a high-frequency isolation current transformer is additionally arranged between each H bridge module of a conventional chain type current transformer and the battery, so that a battery side is insulated from a high-voltage power grid. The bidirectional isolation full-bridge current transformer is controlled to keep voltage of a middle direct-current side; meanwhile, secondary pulse power on the battery side of the chain type current transformer can be buffered; a chain type energy-storing current transformer can be used as an interface of battery energy storage and the power grid, so that high-voltage direct-current grid connection can be realized, the power dispatching of the power grid is accomplished, and the volumes of harmonic and filter elements of an energy storage system, which are accessed into the power grid, can also be reduced. According to the isolation double-stage chain type current transformer disclosed by the invention, the requirements on an insulation grade of a battery module can be reduced, the secondary pulse power on the battery side is reduced, and the safety and the reliability of the battery are guaranteed; and meanwhile, different types of batteries with different voltage grades can be accessed so that the isolation double-stage chain type current transformer can be easily produced in a large scale, and is suitable for a large-capacity, high-voltage and grid-connected battery energy storing system.

The invention relates to a hybrid energy storage converter device and an operation control method thereof. According to the hybrid energy storage converter device, two independent energy storage media, i.e. a lead-acid storage battery and a super capacitor, are connected into a circuit to guarantee the independencies of the lead-acid storage battery and the super capacitor; the main circuit of the energy storage converter device adopts a two-stage conversion topological structure of AC(alternating current)/DC(direct current)+DC/DC, and the operation reliability is higher; when the energy storage device is started to operate, the lead-acid storage battery and the super capacitor enter a hybrid working mode to realize the advantage complementation of electric energy; when a certain energy storage medium fails, a loop in which the energy storage medium is positioned is cut off so as to realize the coordination control of the lead-acid storage battery and the super capacitor; and the technical problem that the traditional energy storage device can not satisfy the requirement of a large-scale energy storage system is solved.

The invention relates to heating control detection equipment and a detection control method of a multistrand insulation self-heating wire. The multistrand insulation self-heating wire comprises a plurality of outer conductors, a protection metal ring, an insulation and heat conduction ring and a plurality of inner side heating rings. The two ends of the wire are connected with a power transmissionline, and the heating control detection equipment with the same structure is arranged at the connecting ends. The heating control detection equipment comprises a voltage measurement module, a variable resistance module, a wire connecting end, a switch, a microprocessor and a wireless communication module. The heating control detection equipment has different control modes according to three different structures of the inner side heating rings. The microprocessor receives a control command from a control center through the wireless communication module; data of the voltage measurement module is transmitted to the control center, and automatic measurement detection of the wire is performed at the same time. According to the equipment and the method, through current of an internal heating structure and the outer conductors is accurately controlled; a voltage difference of the heating configuration is controlled; the insulation requirement of an insulation layer is lowered; and whether the self-heating wire is normal is automatically measured.

The invention discloses a self energy taking device of a high voltage direct current circuit breaker and an implementing method thereof. The self energy taking is composed of a circuit energy taking unit, a high frequency inverter circuit, a high frequency transformer, a magnet ring transformer and a rectifying and voltage-stabilizing circuit connected successively; the implementing method of the self energy taking device includes the steps of: when the circuit energy taking unit is connected into the main branch of the high voltage direct current circuit breaker in series, obtaining energy from the current of the main branch; when current flows through the main branch, controlling the switching-on and switching-off of a switch tube; regulating the charging time of a capacitor to control the voltage range of the capacitor. The self energy taking device provided by the invention utilizes the energy in the circuit without using an additional independent power supply, is applicable to the mechanical switch and power electronic device mixed type direct current circuit breaker, and is lower in insulating requirement of the high frequency transformer with respect to a scheme of supplying power from low potential through the high frequency transformer when being applied to a current limiting device composed of a plurality of direct current circuit breaker connected in series.

The invention relates to a polarity-reversal voltage generator based on a direct current high voltage cascade generation circuit. The polarity-reversal voltage generator solves the problems that the existing polarity-reversal voltage generator cannot generate higher voltage and is higher in cost. After being subjected to voltage regulation by a voltage regulator, single-phase alternating current is input to a boosting transformer to generate high voltage alternating current; the high voltage alternating current is connected with a positive-polarity direct current high voltage cascade generation unit and a negative-polarity direct current high voltage cascade generation unit respectively to generate positive-polarity direct current voltage and negative-polarity direct current voltage; a voltage polarity of a tested article is selected for connection in a manner that a single-pole double-throw switch is selectively connected with an output end of the positive-polarity direct current high voltage cascade generation unit or an output end of the negative-polarity direct current high voltage cascade generation unit; after the voltage polarity is selected, the voltage is connected with one end of the tested article through a protective resistor; and the other end of the tested article is earthed, so that the voltage is applied across the tested article. The polarity-reversal voltage generator is used for a converter transformer.

A ferromagnetic element no-load characteristic low-frequency measuring method mainly comprises the following steps: 1) establishing a high-voltage side open-circuit equivalent circuit according to a T-type equivalent circuit, applying two low-frequency sine waves having different frequencies at the low-voltage side, and calculating iron-core loss under each frequency; 2) calculating unit hysteresis and eddy-current loss We and Wh produced in each period, and calculating iron core loss PCoren when converted to the power frequency; 3) calculating exciting current Iexn, harmonic content K(k) and exciting voltage Un when converted to the power frequency according to an eddy current compensation algorithm; 4) calculating no-load loss Pn; and 5) drawing PCoren-Un, Iexn-Un relation curves and a K(k)-Un harmonic content table. The test is carried out by adopting low-frequency power to replace power frequency power, so that test power source capacity can be reduced by times, the size and weight of the test device are reduced, and the test cost is allowed to be lower.

The invention discloses a high-voltage and large-power wind power generation system and a control method thereof. The high-voltage and large-power wind power generation system comprises a multi-phase permanent-magnet direct-drive wind power generator, 3n three-phase full-control rectification bridges and an H-bridge cascaded multilevel inverter, wherein the multi-phase and large-power permanent-magnet direct-drive wind power generator is provided with 9n phase outputs, n is a positive integer, each three phases form a winding, the 9n phase outputs jointly form 3n windings, each winding is connected with a DC side of each sub-module of the H-bridge cascaded multilevel inverter after being converted by one of the three-phase full-control rectification bridges, and an AC output end of the H-bridge cascade multilevel inverter is connected with a three-phase power grid. The three-phase full-control rectification bridges employ maximum power tracking control to achieve the output of a unit power factor of the wind power generator; and the H-bridge cascaded multilevel inverter is used for achieving high-voltage access, and an AC side is directly connected with a 35kV alternating current. By the high-voltage and large-power wind power generation system, the low-voltage and large-power permanent-magnet direct-drive wind power generation system can be directly connected with a high-voltage power transmission system by a converter, a boost transformer is omitted, and the cost is reduced.

The invention discloses a hot air type asphalt pavement heating device for thermal regeneration of an old asphalt pavement, which comprises a chassis truck, wherein a hot air generating device is arranged on the chassis truck, and comprises an air heating furnace for heating air to generate hot air, and a bottomless hot air hood is movably arranged below the chassis chuck; a first air outlet holefor conveying the hot air to the ground is formed in the hot air hood, and the air heating furnace supplies the hot air to the first air outlet hole through a hot air conveying pipe; the hot air hoodis peripherally provided with an air shield felt which may be in contact with the ground, and the hot air hood is connected to the air heating furnace through a hot air recovery pipe. The hot air hoodforming a relatively closed space with the pavement is arranged at the bottom of the heating device provided by the invention, and after the hot air generated by the heating device acts on the ground, the hot air can be recovered by the hot air hood, and supplied to the air heating furnace to be reused, thereby effectively improving the utilization efficiency of the hot air and saving energy.

The invention provides a stator stamping and a motor. The stator stamping is provided with an annular yoke and a plurality of teeth, the teeth are outwardly extended from the yoke along the radial direction of the stator stamping, a notch is formed between each two neighboring teeth, moreover, the middle of the stator stamping is provided with an inner round hole, wherein the notches are shallow notches and deep notches, which are arranged alternately, and the opening height of the deep notch is greater than the total height of the shallow notch. The motor is provided with a stator and a rotor, the stator is provided with a stator core made of the laminated stator stampings and coils wound on the stator core, the coils are a plurality of inner coils and a plurality of outer coils, each inner coil is wound between two deep notches, and each outer coil is wound between two shallow notches. The invention can decrease the difficulty of the coil-winding process; moreover, the coils are not overlapped spatially, so that the requirement on the insulation of the coils is decreased, and thereby the production cost of the motor is reduced; moreover, when the motor operates, the magnetic density is more uniform, and operation is more stable.

The invention discloses a vacuum arc-extinguishing-chamber burn-in device of a direct-current superposed high voltage pulse and a method thereof. The device comprises a direct current power supply, a pulse power supply, a vacuum arc-extinguishing chamber, a blocking coupling capacitor and an isolation inductor. One end of the direct current power supply and one end of the pulse power supply are connected to one end of a vacuum arc-extinguishing chamber contact. The other end of the direct current power supply is connected to one end of the isolation inductor. The other end of the pulse power supply is connected to one end of the blocking coupling capacitor. The other end of the blocking coupling capacitor and the other end of the isolation inductor are connected to the other end of the vacuum arc-extinguishing chamber contact. By using the device and the method, technology difficulty is small, cost is low, and simultaneously single burn-in energy can realize accurate adjusting.

The invention provides a magnetic suspension electrode dielectric barrier diffuse discharge plasma generation device comprising a PTFE support. The center of the bottom part of the PTFE support is provided with a magnetic grounding electrode, micropore ceramic and a magnetic suspension electrode which are arranged from the bottom to the top in turn. The center of the top part of the PTFE support is provided with a high voltage electrode and an alumina ceramic barrier dielectric which are arranged from the top to the bottom in turn, wherein a gap is reserved between the magnetic suspension electrode and the alumina ceramic barrier dielectric. The device generates negative diffuse discharge from multiple points to the surface under driving of an AC power supply in working, and the high voltage side becomes a transient cathode so that a large number of active particles can be accumulated. Magnetic iron powder is arranged on the surface of the barrier dielectric, and a large number of triple junction points are manufactured on the surface of the barrier dielectric so as to acquire the diffuse discharge plasmas; and the iron powder can be melted to take away the heat in case of discharge overheat so as to protect the barrier dielectric material. The device can be used as the plasma generation device for the aspect of material surface modification of films and insulators, etc.

The invention relates to a method for realizing the insulation coordination of basic functional units of a voltage source converter (VSC) based on a half bridge circuit, which comprises the following steps of: 1) determining the insulation strength and properties of each component according to the steady-state over-voltage level, transient-state over-voltage level and transient over-voltage level of a sub-module under various operation conditions; 2) making equal the ground potential of a metal shell and a secondary control protection board of primary equipment and the potential of the cathode of the sub-module according to the potential distribution characteristics of the sub-module, and connecting the secondary control protection board and a primary circuit by using an isolation transformer to isolate the influence of the high voltage of the primary circuit on a secondary circuit; 3) shielding the electromagnetic interference of an insulated gate bipolar translator (IGBT) high speed switch in the secondary control protection board by using a metal shielding box according to the electromagnetic field distribution of the sub-module; 4) making equipotential an operating mechanism of a bypass switch and the cathode of the sub-module; and 5) selecting a high voltage wire as a wire crossing a high potential and a low potential to reduce the local discharge capacity of the sub-module. By the insulation coordination method, the insulation requirements of a system can be met, and high security and high economy are achieved.

The invention relates to a voltage droop control method of a DC power grid. The voltage droop control method comprises the steps of: starting with a grid frame structure of the DC power grid, defining a relationship between voltage and current of a convertor station in the DC power grid, transforming typology of the DC power grid, and changing the DC power grid of an arbitrary structure into the one of only a topological structure in radial connection; analyzing flow distribution of the DC power grid, and calculating power variations of subcircuits when voltage of a system fluctuates; and constructing a convertor station voltage droop function according to power variations of the system, so that power of the subcircuits remains unchanged when the voltage of the system fluctuates, thereby achieving the effect of reducing system voltage fluctuations. The voltage droop control method of the DC power grid provided by the invention can stabilize the system voltage quickly, distribute system flow reasonably, and reduce insulating requirement of the system.