59 results about "Autotransformer" patented technology

The application provides a high-power low-voltage starting rectifying device, which comprises a three-phase input power distribution and filter unit, a three-phase 12-pulse rectifying unit, a DC / DC unit I, a DC / DC unit II and a control module; the three-phase input power distribution and filter unit is connected with the three-phase 12-pulse rectifying unit, the three-phase 12-pulse rectifying unit adopts a differential connection triangle autotransformer 12-pulse rectifying technology and is connected with the DC / DC unit I and the DC / DC unit II respectively; the DC / DC unit I adopts a three-channel staggered parallel phase-shift full-bridge technology, and the DC / DC unit II adopts a single-channel phase-shift full-bridge technology; the control module is connected with the DC / DC unit I and the DC / DC unit II respectively; the control module is used for controlling the DC / DC unit I and the DC / DC unit II to convert direct current voltage and supply a hovercraft gas turbine. The hovercraft gas turbine can be started.

The invention provides a multi-stage switch topology voltage regulator. The multi-stage switch topology voltage regulator comprises a transformer module, a switch control module and a tap selection module, the transformer module is electrically connected with the switch control module and the tap selection module, and the transformer module, the switch control module and the tap selection module cooperate to realize uninterruptible power voltage regulation; the transformer module comprises one of an autotransformer and a compensation transformer; the tap selection module comprises one of a single one-out-of-N switch module and a double one-out-of-N switch module. The technical problems that a traditional voltage regulator is difficult to consider direction flexibility, precision, transformation ratio range and structural rationality at the same time on the basis of'uninterruptible power voltage regulation ', and the technical scheme is simplified are solved.

This utility model provides a wiring system for the low-voltage side of a single-phase autotransformer and a prefabricated box-type switchgear in a confined space, comprising: a low-voltage bushing of the single-phase autotransformer, an aluminum tube busbar branch bus, an aluminum tube busbar main bus, a copper tube bus, and a prefabricated box-type switchgear. The low-voltage bushing of the single-phase autotransformer is connected to the aluminum tube busbar branch bus via a flexible copper busbar; the aluminum tube busbar branch bus is connected to the phase-separated aluminum tube busbar main bus via a flexible copper busbar; the aluminum tube busbar main bus is connected to the copper tube bus; and the end of the copper tube bus is connected to the prefabricated box-type switchgear. The wiring system provided by this utility model occupies little space and has a simple and compact layout; the delta connection on the low-voltage side of the transformer uses an aluminum tube bus to reduce costs, and the connection to the box-type switchgear bus avoids terrain limitations by using a flexible copper tube bus; the prefabricated box-type switchgear occupies little space, is easy to assemble and saves construction time, and the internal switch cabinet spacing is easy to expand.

The invention discloses a series adjustable voltage source type direct current power flow controller circuit, a method and a terminal, the scheme provided by the invention adopts a single bridge arm structure design in a parallel connection part, an autotransformer and a resonance groove are introduced, the single bridge arm structure can reduce the number of power devices and magnetic core elements, and the size of the power devices and the magnetic core elements is reduced. Meanwhile, the amplitude of the output alternating voltage is improved by connecting the autotransformer in series, the current stress flowing through the sub-modules is reduced, the conduction loss can be reduced, it can be ensured that the full voltage of the system is controlled within the bearable range of the sub-modules of the parallel modules, and the system reliability is improved. The parallel module and the series module are connected in cooperation with the resonant tank, soft switching operation of the sub-module is achieved, current impact in the switching process is effectively restrained, switching loss is greatly reduced, hardware configuration of a series adjustable voltage source type direct current power flow controller circuit is simplified, and the reliability of the direct current power flow controller circuit is improved. And the equipment cost and the structural complexity are reduced.

The invention discloses an automatic voltage regulating and stabilizing device for a power electronic SVR circuit, and belongs to the technical field of power electronics. Comprising a self-coupling voltage regulator unit, a power electronic regulation unit and a bypass unit, the self-coupling voltage regulator unit is connected in series with the power electronic regulation unit, and the bypass unit is connected in parallel with the power electronic regulation unit; the power electronic regulation unit is a unified power quality regulator with a series-parallel connection structure and comprises a series connection side module and a parallel connection side module; and a series winding and a parallel winding of the unified power quality regulator and an autotransformer of the autotransformer voltage regulator unit adopt a winding integrated structure design. According to the medium-voltage power distribution network voltage regulating device, the self-coupling voltage regulator and the unified power quality regulator (UPQC) of a series-parallel structure are deeply fused, and an integrated framework with coarse and fine regulation coordinated voltage regulation, winding integration and fault bypass redundancy is designed; the comprehensive improvement of the voltage regulation performance, the service life of the device, the electric energy quality treatment, the structure cost and the operation reliability is realized.

A power module includes N groups of interleaved parallel PFC circuits and a controller. Each group of the interleaved parallel PFC circuits includes a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm. The autotransformer includes a first winding and a second winding that are coupled to each other. The controller is configured to: in response to that an absolute value of a difference between a current of the first winding and a current of the second winding is greater than or equal to a preset value, adjust a duty cycle of a drive signal of a switching transistor of the first rectifier bridge arm or the second rectifier bridge arm in a next switching cycle.

The invention discloses a GIC blocking method under geomagnetic disturbance based on real-time reactive monitoring of a transformer. The method comprises the following steps: judging whether an estimated GIC amplitude meets a first preset threshold condition or not; if so, taking the estimated GIC amplitude as a final GIC amplitude; if not, obtaining the equivalent inductance of the autotransformer, and based on an Lmef-Idc nonlinear curve established through a three-dimensional electromagnetic field-circuit coupling simulation technology, carrying out backstepping and obtaining a final GIC amplitude corresponding to the equivalent inductance at the moment; on the basis of a controllable resistance type dynamic blocking and closed-loop control strategy monitored and fed back in real time, whether the GIC amplitude meets a second preset threshold value condition or not is judged, and when the second preset threshold value condition is not met, an adjustable resistor in the GIC blocking device is adjusted till the obtained final GIC amplitude meets the second preset threshold value condition. According to the method, the problem that GIC blocking of the autotransformer under geomagnetic disturbance cannot be effectively achieved through an existing method is solved.

The invention belongs to the technical field of voltage-withstanding instrument boosting power supplies, and particularly relates to a full-voltage-range high-performance boosting device and a control method thereof. The device comprises a front-stage electric self-coupling voltage regulator and a rear-stage full-bridge inverter, the front-stage electric self-coupling voltage regulator is associated with the rear-stage full-bridge inverter through a direct-current bus to perform voltage linkage control; the front-stage electric self-coupling voltage regulator is used for realizing alternating current voltage regulation in a range of 0-220V; and the post-stage full-bridge inverter is used for converting the voltage-regulated alternating current into 0-311V variable direct current voltage, and inverting the direct current voltage to obtain the required output voltage. According to the invention, through a cooperative control strategy, full-range high-precision and low-harmonic voltage output from zero to rated voltage can be realized.

This invention provides a high-voltage, high-capacity autotransformer, comprising: a supporting capacitor, an energy buffer bridge arm, and a converter valve assembly. The supporting capacitor forms part of the power transmission loop; the energy buffer bridge arm realizes the main power transmission and forms another part of the power transmission loop; the transformer commutation is achieved by controlling the number of bridge arm sub-modules engaged in the energy buffer bridge arm and the trigger signal of the converter valve assembly. The invention also provides a commutation operation method and a control method for this transformer. This invention realizes energy transfer from the low-voltage side to the high-voltage side, improves transformer efficiency, and achieves energy balance in the energy buffer bridge arm; by controlling the number of energy buffer bridge arm sub-modules engaged, reliable shut-off and near-zero voltage conduction of the converter valve are achieved, while providing two closed-loop modes: DC voltage and power control. This invention realizes a high-voltage, high-capacity DC transformer, and by using a semi-controlled converter valve, reduces device costs.

A HVDC transformer configuration for use in electrical power transmission to at least a first AC network and a second AC network. The configuration including a three single phase HVDC transformer, in which each phase includes a first winding connected to a HVDC converter(s) and a second winding connected to both the first AC network and the second AC network; and wherein the second winding of each phase is configured as an auto-transformer and includes a tap connection, the tap connection being connected to a Phase Shifting Transformer to regulate the power transmission to the second AC network.

The application provides a cable anti-theft system based on common N line, belonging to the field of cable anti-theft, which comprises a power supply system, a power supply protection switch, a cable, a charging device, an overvoltage relay, a battery pack, a wireless transmitting device, a repeater, a capacitor, an earth, an alarm terminal grounding device and a power supply system grounding device. One end of the charging device is connected with the phase line of the cable, and the other end is connected with the neutral line of the cable. The positive input end of the battery pack is connected with the output end of the charging device through the normally closed contact of the voltage relay. The charging transformer adopts a single-phase autotransformer. Since the common end in the primary side / secondary side of the autotransformer is directly connected and connected with the neutral line of the power cable, the AC / DC loop of the device can directly use the neutral line N line of the power cable as the common conductor, which provides sufficient and necessary conditions for the operation of the device. Meanwhile, the earth is used as another conductor of the device, thereby saving the cost of the system.

The utility model relates to the field of single-phase-to-three-phase power supplies, in particular to a portable single-phase-to-three-phase electrical control power supply device, which comprises a two-pole single-phase circuit breaker, a frequency converter, a three-phase autotransformer, a single-phase transformer, a two-pole circuit breaker and a three-pole circuit breaker, the input end of the two-pole single-phase circuit breaker is connected with an external alternating-current power source, the output end of the two-pole single-phase circuit breaker is connected with the input end of the frequency converter, the output end of the two-pole single-phase circuit breaker is further connected with the input end of the single-phase transformer, and the output end of the frequency converter is connected with the input end of the three-phase autotransformer. The output end of the three-phase autotransformer is connected with the input end of the three-pole circuit breaker, the output end of the three-pole circuit breaker is connected with the three-phase asynchronous motor, the output end of the single-phase transformer is connected with the input end of the two-pole circuit breaker, and the output end of the two-pole circuit breaker is connected with the control circuit. The device is small in size and convenient to install, and the cost is greatly reduced.

The invention relates to a switched capacitor converter and a voltage generation method. An apparatus, such as a switched capacitor converter, as discussed herein, includes: a plurality of capacitors; a multi-tap autotransformer comprising a first primary winding and a second primary winding, a plurality of capacitors disposed in a circuit path of a switched capacitor converter comprising the first primary winding and the second primary winding, the first primary winding comprising a first tap node to receive a first current and the second primary winding comprising a second tap node to receive a second current. The second primary winding includes a second tap node to receive a second current. And an output stage coupled to receive energy from a combination of the first and second primary windings of the multi-tap autotransformer, the output stage operable to generate an output voltage to power a load.

The invention is related to an electrolysis plant (1) comprising an electrolyser (3), a transformer unit (21) and a rectifier (15a, 15b). The transformer unit (21) comprises a transformer (9,11) and an autotransformer arrangement (19) for receiving power from a grid (25) to supply the electrolyser (3) with electrolysis current. The autotransformer arrangement (19) comprises a first autotransformer (19A) and a second autotransformer (19B) electrically coupled in series so that the first autotransformer (19A) is arranged upstream of the second autotransformer (19B) with its terminals (43) connected to the grid (25) and equipped at its primary winding (39) with a bypass switch (SI) and an step-up switch (S2).The electrolysis plant (1) is enabled to perform a Low-Voltage-Ride-Through (LVRT) operational mode. The invention is further related to a method for operating an electrolysis plant (1), particularly in a LVRT operational mode.

In an aspect of the present disclosure, an IoT-based automated voltage controller system for motor-operated three-phase autotransformer is disclosed and a method thereof. The controller system includes a single-phase bidirectional synchronous motor mechanically connected with a shaft of the autotransformer. The motor changes tapping of windings of the autotransformer through dials. A switch mode power supply (SMPS) circuit is configured to supply power to the voltage controller unit, which primarily steps down the voltage to 5V and rectify thereto into DC voltage. An Arduino-nano microcontroller associated with a plurality of modules. The modules are configured such that the output voltage of the motor-operated three-phase autotransformer remains either constant or varies at +4V irrespective of nature of power supply automatically during full load conditions, thereby compensating supply voltage fluctuations.

The utility model relates to a kind of rotating electric field enhanced crude oil three-phase separators, belong to oilfield equipment field, comprising: degassing tower and electric field dehydration tank;Degassing tower is equipped with demisting packing;Electric field dehydration tank is equipped with electric field component and coalescence packing in sequence;Electric field component includes three stainless steel electrodes, three stainless steel electrodes are deeply into electric field dehydration tank and with external three-phase autotransformer electric connection, to produce rotating electric field in the area of coalescence packing;Rotating electric field is used to induce molecular dipole moment to promote oil-water separation;Wherein, the liquid outlet of degassing tower is connected with the liquid inlet of electric field dehydration tank, the gas phase communication port of degassing tower is connected with the gas return port of electric field dehydration tank, and closed loop is formed between degassing tower and electric field dehydration tank.The utility model does not use chemical reagent, avoids the influence of chemical residue on subsequent refining process, and only uses small amount of electric energy, saves energy consumption, improves economic benefit, improves production efficiency.

The present disclosure provides a new broadband balun structure, comprising an inverting transformer and an autotransformer; wherein the inverting transformer is configured to invert an input signal to generate an inverting signal; the autotransformer is configured to divide the input signal to generate an in-phase signal; at least one of one end of the inverting transformer or one end of the autotransformer is connected to an unbalanced end; the inverting transformer is connected to the autotransformer when the one end of the inverting transformer or the autotransformer is connected to the input signal of the unbalanced end; and the other end of the inverting transformer is used as an inverting signal end of a balanced end, and the other end of the autotransformer is used as an in-phase signal end of the balanced end.

The utility model discloses an automatic detection device for a storage battery load meter, which comprises a voltage regulation conversion module, a rectification filtering module and a main control module, the AC voltage regulation conversion module at least comprises a three-phase self-coupling voltage regulator and a three-phase isolation transformer, and the AC rectification filtering module at least comprises a three-phase rectification filter. The alternating current main control module is configured to acquire the output voltage, current and discharge capacity of the rectification filter module in real time and adjust the three-phase self-coupling voltage regulator to stabilize the output voltage of the automatic detection device at a target voltage value, and the main control module is electrically connected with the control end of the three-phase self-coupling voltage regulator and the output end of the three-phase rectification filter. And star-to-triangle conversion is carried out between the input end and the output end of the three-phase isolation transformer so as to reduce the output voltage of the three-phase isolation transformer and reduce the input current of the three-phase self-coupling voltage regulator. By adopting the automatic detection device provided by the utility model, the power supply condition of an existing laboratory modified from an office does not need to be changed.

The invention discloses a large-scale single-phase autotransformer induction withstand voltage test modeling and parameter calculation method, and the modeling comprises a variable-frequency power supply, an excitation transformer, an autotransformer and a partial discharge instrument, and a compensation reactance assembly is connected in parallel between the high-voltage side of the excitation transformer and the low-voltage winding of the autotransformer. The high-voltage winding is provided with zero potential and is connected with the sensor and the partial discharge instrument. According to the parameter calculation method, total reactive power and active loss are obtained by collecting no-load data and calculating capacitance, voltage distribution, capacitive and inductive reactive power and active loss. Test verification shows that the deviation between calculated values and measured values of parameters such as resonant frequency and variable-frequency power supply input current is within 10%, test equipment model selection and scheme making can be accurately guided, test efficiency is improved, and equipment safety is guaranteed.

This utility model relates to an adjustable high-current generator based on an autotransformer, comprising an autotransformer body (1), an annular iron core (2) on the autotransformer body (1), several turns of adjustable coil (3) wound on the annular iron core (2), a voltage adjustment knob (4) rotatably mounted on the autotransformer body (1), a sliding contact (5) on the voltage adjustment knob (4) cooperating with each adjustable coil (3), several turns of fixed coil (6) wound on the annular iron core (2), one end of the fixed coil (6) connected to one end of the adjustable coil (3) according to polarity, and the other end forming the primary coil with the coil between the sliding contact (5), and a low-voltage high-current secondary coil (7) wound on the annular iron core (2). It simplifies the structure of existing high-current generators, is smaller in size and lighter in weight, easier to transport, has a wider current adjustment range, lower cost, and can meet diverse use and testing needs.

The utility model discloses a modularized three-phase voltage stabilizer, and aims to provide a modularized three-phase voltage stabilizer which is based on modularized design, compact in structure, efficient, reliable and convenient to maintain, and the technical scheme is characterized in that the modularized three-phase voltage stabilizer comprises a shell, three independent voltage regulating modules, a layered heat dissipation structure and an intelligent control unit, each voltage regulating module comprises a bidirectional silicon controlled rectifier group and an autotransformer, the intelligent control unit is provided with a microprocessor, and the microprocessor is used for controlling the voltage regulating modules and realizing split-phase dynamic regulation. The layered heat dissipation structure comprises a heat dissipation substrate which is arranged below the autotransformer and is in direct contact with the silicon controlled rectifier group, axial flow fans which are arranged at the bottom of the heat dissipation substrate, and an exhaust channel which is horizontally arranged, the axial flow fans are attached to the inner side of the shell, and the channel direction of the exhaust channel is the same as the air inlet direction of each axial flow fan; the utility model is suitable for the technical field of power voltage stabilization.

The application discloses a kind of super-wide voltage-regulating 12-pulse rectification ice-melting transformer device and ice-melting method, super-wide voltage-regulating 12-pulse rectification ice-melting transformer device includes autotransformer and 12-pulse rectification transformer, the output end of autotransformer is set as voltage multi-grade adjustable, 12-pulse rectification transformer includes rectification transformer body and two 12-pulse rectifiers, the primary side of rectification transformer body is connected with the output end of autotransformer, the secondary side of rectification transformer body is set as high-voltage gear and low-voltage gear, two 12-pulse rectifiers are respectively connected with high-voltage gear and low-voltage gear one-to-one, 12-pulse rectification transformer is used to select one from high-voltage gear and low-voltage gear according to the output voltage required by ice-melting and run, so that wide voltage output can be realized by gear combination of front and rear two-stage transformer, reach the purpose of ice-melting demand of super-wide voltage-regulating range of multiple lines.

The invention relates to electrical engineering, specifically relay protection, and can be used as a busbar protection device for power plants in a 4 / 3 configuration with nine connections. The technical result is to prevent unit shutdown and complete power plant shutdown in the event of a short circuit on the busbar, when the busbar protection is triggered but the busbar circuit breaker and the adjacent circuit breaker fail, thereby preventing the power plant from shutting down. A device for protecting the busbars of an electric power station in a 4 / 3 scheme with first and second buses, between which three chains are connected, each with a first, second, third and fourth switch, connected in series, where the first switches are connected to the first busbar, and the fourth to the second, and between the first and second switches of the extreme left and right chains the first and second power transmission lines are connected, respectively, between the third and fourth switches the third and fourth power transmission lines, between the second and third switches the first and second generator-transformer units, and in the middle chain between the first and second switches an autotransformer is connected, between the second and third the fifth line, between the third and fourth - the third generator-transformer unit, contains a series-connected measuring element, a logic unit and a relay with four contacts, three of which are connected to the trip coils of the first switches, the relay of the "On" positions of these and the second switches, Output relays for the primary circuit breaker and control bus failure backup devices, three four-input AND gates, the output of each of which is connected via a time relay to the corresponding output relay, the first, second, third, fourth, fifth, and sixth intermediate relays with normally-closed contacts with a time delay upon failure and normally-open contacts, three pushbuttons, and six signal lamps. Economic benefit: a large number of consumers will not lose power.

The invention relates to the technical field of power grid safety equipment, in particular to a 10kv intelligent high-voltage electromagnetic balance power saving device which comprises a wire inlet cabinet, a bypass cabinet, a wire outlet cabinet, a power cabinet and a control cabinet which are arranged in sequence, the bypass cabinet is connected with a wire inlet end, the wire outlet cabinet is connected with a wire outlet end, a fuse and a first voltage transformer are connected in series in the wire inlet cabinet, and the first voltage transformer is arranged in parallel. A second circuit breaker, a current transformer and a second voltage transformer arranged in parallel are connected in series in the bypass cabinet, a third circuit breaker is connected in series in the outgoing line cabinet, other structures are the same as those of the bypass cabinet, an autotransformer is arranged in the power cabinet, and a vacuum contactor is arranged in the control cabinet. And overvoltage protectors are connected in series to the autotransformer and the vacuum contactor circuit. According to the invention, the autotransformer and the vacuum contactor can be protected, and through the breaker 1, the breaker 2 and the breaker 3 in the cabinet and the cooperation of the rapid control system, the circuit can be kept uninterruptible, the normal production of a factory is not affected, and the problem of voltage drop is solved.

The invention relates to a power converter and a method for operating a power converter. A power converter and method are disclosed. The power converter comprises: an input (a, b, c) configured to receive three alternating input voltages (Va, Vb, Vc); a switching circuit (1) coupled to the inputs (a, b, c) and comprising a three-phase half-bridge; an autotransformer circuit (5); and a rectifier circuit (6). The autotransformer circuit (5) is coupled between the switching circuit (1) and the rectifier circuit (6), and the rectifier circuit (6) is coupled between the autotransformer circuit (5) and the output (q, r) of the power converter.

The application discloses a hybrid integrated radio frequency power amplifier, which comprises a signal input end, a driving amplifier, a power amplifier, an output balun and a signal output end which are sequentially connected; the driving amplifier comprises a first-stage amplifier, an inter-stage balun, a second-stage amplifier and a power combining network which are sequentially connected; the power combining network comprises a self-coupling transformer with four input ends and two output ends; the hybrid integrated radio frequency power amplifier can improve the output power, the output efficiency and the linearity of the driving amplifier, reduce the area of the power combining network on the chip and the insertion loss, and reduce the cost of the hybrid integrated radio frequency power amplifier.

A power converter and a method are disclosed. The power converter comprises an input (a, b, c) configured to receive three AC input voltages (Va, Vb, Vc); a switching circuit (1) coupled to the input (a, b, c) and comprising a three-phase half-bridge; an autotransformer circuit (5); and a rectifier circuit (6). The autotransformer circuit (5) is coupled between the switching circuit (1) and the rectifier circuit (6), and the rectifier circuit (6) is coupled between the autotransformer circuit (5) and an output (q, r) of the power converter.

A power converter and a method are disclosed. The power converter includes an input to receive three alternating input voltages; a switching circuit coupled to the input and comprising a three-phase half-bridge; an autotransformer circuit; and a rectifier circuit. The autotransformer circuit is coupled between the switching circuit and the rectifier circuit, and the rectifier circuit is coupled between the autotransformer circuit and an output of the power converter.

Disclosed are a quick charging device for charging a plurality of battery packs and a quick charging method using the same, and more particularly a quick charging device for charging a plurality of battery packs, the quick charging device including a positive electrode high-voltage terminal configured to supply voltage, a negative electrode high-voltage terminal configured to supply voltage, a plurality of DC / AC converters connected to each of the positive electrode high-voltage terminal and the negative electrode high-voltage terminal, a plurality of variable AC autotransformers connected respectively to the plurality of DC / AC converters, each of the variable AC autotransformers being configured to adjust a voltage value, a plurality of AC / DC converters connected respectively to the plurality of variable AC autotransformers, a plurality of resistor modules connected respectively to the plurality of AC / DC converters, and a controller connected to each of the variable AC autotransformers, the controller being configured to control the voltage value of each of the variable AC autotransformers.