Arrangements for eliminating or reducing asymmetry in polyphase networks (H02J3/26)

Device for symmetrization and stabilization of three-phase voltage // 2641649
FIELD: electricity.SUBSTANCE: device for symmetrization and stabilization of three-phase voltage comprises three winding groups of three identical series-connected secondary windings of three single-phase transformers having by one primary winding. On the magnetic circuit of each transformer an additional winding with branches through an equal number of turns is placed, the beginning of the additional winding is connected to the beginning of the primary winding and the beginning of the farthest secondary winding of one of the winding groups. The end, beginning or any branch of the additional winding is connected to the corresponding input phase grip by means of the switching circuit at the signal of the control unit. The end of the primary winding is connected to the zero grip. The number of branches of the additional winding is not limited, and the number of turns should be four or more times smaller than that of the primary winding.EFFECT: expansion of functionality and improvement of the quality of the device.1 dwg

Three-phase-single-phase transformer of evseev // 2640571
FIELD: electricity.SUBSTANCE: three-phase single-phase transformer contains a magnetic circuit, two connected in series primary windings and a secondary winding. The magnetic core is made three-rod. Primary windings are wound on the two extreme rods of the magnetic circuit and are connected in series in a counter-manner. The secondary winding is wound on the middle rod, the width of which is equal to times the width of the outer rods.EFFECT: reduction of weight and dimensions, simplification of design and increase of efficiency.4 cl, 2 dwg

Device for symmetring network voltage at breakage of two any phases // 2633961
FIELD: electricity.SUBSTANCE: device comprises network terminals, three minimum voltage relays with two NO contacts and one NC contact monitoring the voltage in the network phases separately, a phase-forming device, and terminals for connecting the load, a three-phase relay of monitoring all phases simultaneously, equipped with one three-phase NO contact and one three-phase NC contact. The phase-forming device is made in the form of a phase number converter according to the type of an electric machine with a retarded rotor comprising an input part made up of the first and the second winding and a capacitor. Said windings are located in the grooves of the inner core, and an output part containing an outer core coaxial with the inner one, in the grooves of which an output three-phase winding connected into a star is located, and a three-branch parallel circuit is made from the NC and NO contacts of the three minimum voltage relays. The beginning of each branch is the phase, the middle is the serial connection of the opening contacts of the relay of neighboring phases and the NO contact of the relay of the own phase, and the end of each branch is the common connection point of all branches. The end of the first winding of the input part of the phase number converter is connected to the beginning of the second winding, and their common point is connected to the zero wire, the end of the second winding is connected to the second output of the condenser, the first output of which is connected to the beginning of the first winding, and their common point is connected to the common connection point of all branches. The NO contact of the three-phase relay is connected to the splitting of all network phases between the network terminals and the load connection terminals, and the NC contact of said relay is connected between the outputs of the three-phase winding of the output part of the phase number converter and the load connection terminals, respectively.EFFECT: increasing the network voltage quality at breaking of any two phases.1 dwg

Device for interphase current distribution (versions) // 2633958
FIELD: electricity.SUBSTANCE: first version of the device for interphase current distribution contains two single-phase transformers, the intermediate output of each winding is connected to the first terminal of the consumer, and the outermost terminals - to the phase input terminals. The second consumer terminal is connected to the common point of the two end terminals of the mentioned windings, the number of turns of each of which is divided by an intermediate terminal into two unequal sections. Sections of windings with a large number of turns are connected to the phase input terminals. The second version of the device differs from the first version in that the intermediate output of each winding of the transformer divides its number of turns into equal parts. According to the first version, the recovery range extends from a value in excess of half of the energy consumed to a value limited only by the structural complication of the MRI transformers associated with a pronounced inequality in the cross-sections of each phase winding section. According to the second version, the recovery is equal to half the energy consumed. The cross-sections of each phase winding section are equal, which simplifies their production. Magnetic cores of MRI transformers can have different configurations, including a twisted band-shaped ribbon.EFFECT: expanding the range of energy recovery in case of use for single-phase consumers.2 cl, 1 dwg
Device for neutralizing equalizing current in neutral bus of three-phase power transmission line // 2630778
FIELD: electricity.SUBSTANCE: equalizing current neutralizing device in neutral bus of three-phase power transmission line is claimed, which is connected to the transformer substation on one side and the consumer with varying phase loads on the star circuit on the other side, characterized in that it uses a single-phase transformer with three identical primary windings, which starting terminals are connected to neutral terminals of the secondary windings of the phase voltages of the substation three-phase power transformer, and their ends are connected to each other in a node, and the secondary winding of this transformer is connected in opposition-series between said node and neutral bus of the line, wherein the number of turns of this winding is chosen so that voltage induced therein proportional to equalizing current as geometric sum of phase currents is equal to and directed to opposite voltage which would fall in zero bus resistance from the flow of equalizing current therein in the absence of given device.EFFECT: reduction of power losses during its transportation through four-wire line.2 dwg

Smart power module // 2630777
FIELD: electricity.SUBSTANCE: smart power module is claimed comprising a three-phase transformer with three closed iron magnetic cores, each of which is provided with an input and three output windings, two of which are connected in series, the first of which is connected in anti-series with third winding which is arranged in a zigzag pattern in adjacent magnetic circuit as in a balancing transformer. Three second windings of each of the magnetic cores are provided with N terminals connected to respective phases of power transmission line through controllable triacs. The free ends of three third windings are connected in parallel to three like windings of single-phase transformer, the secondary winding of which is connected in series between the common point of the free ends of three said input of the single-phase transformer and the neutral bus of the power transmission line. The selection of respective drops of the second multi-drop windings of the three-phase transformer through N corresponding controlled triacs to the three phases of the power transmission line is performed automatically by means of three identical automatic control systems from electronic devices for controlling the current force in each phase and voltages therein at the beginning of the power transmission line, and also by means of three separate two-loop automatic control systems with conversion of control analog signals to digital codes with following decoder with number of channels N at outputs of each decoder connected with controllable triacs through N optopairs. The automatic control system included in the module includes a phase current measuring device, an alternating current voltage meter at the beginning of the power transmission line, a voltage meter falling in the phase conductor with a known resistance in the power transmission line, two constant voltage shapers-equivalents of voltage difference at the beginning of the line and the phase line and the voltage to be stabilised at the end of the phase conductor of the power transmission line, and also an analog adder.EFFECT: increased performance of voltage control process at consumer on each of the phases with increased stabilisation accuracy, increased reliability of the action, skew elimination of phase voltage and reduced electric power losses by reducing the equalizing current in neutral bus during automatic redistribution of energy flows to different consumers along their dedicated transmission lines with expansion of power consumption range by different consumers.2 cl, 3 dwg

Triphase controlled shunt reactor // 2628751
FIELD: electricity.SUBSTANCE: in every phase (1, 4, 5) the reactor comprises two coils (2, 3) that are made integral with the other phases coils through one output into two wyes, among the zero terminals of which and the earthing (11) there are earth inductors (12, 13), and also there are two connected in series capacitors (6, 7) among these zero terminals. The driver source (10) is attached to the zero terminals with pole terminals through the filter chokes (8, 9). The new thing is that the capacitors (6, 7) mean point is linked to the earthing (11).EFFECT: reliability growth.7 cl, 7 dwg

Device for voltage control // 2628403
FIELD: electricity.SUBSTANCE: voltage control device comprises of a three-phase transformer. The primary winding of each phase of the transformer includes series-connected network and control part, wherein the first outputs of the control part are connected to the output of the network part in each phase. Thus, a common point is formed. The second outputs of the control part are connected to the first outputs of an uncontrolled reactor of each phase. The second outputs of the uncontrolled reactors of all three phases are interconnected forming the first neutral. The first outputs of thyristor keys are connected to the common connection point of the control and network parts of the first and second phases. The second outputs of the thyristor keys of the first and second phases are combined together to form the second neutral, to which the common connection point of the network and control parts of the third phase primary winding is connected.EFFECT: simplification of design, improvement of control characteristics and increase of reliability.3 cl, 4 dwg

ethod and device for electric current input into electric network // 2613357
FIELD: energy.SUBSTANCE: use: in electric power engineering. According to method of electric current input into electric three-phase network with first, second and third phases with first, second and third voltages with network frequency measuring first, second and third voltages, converting first, second and third voltages into positive-sequence voltage system and negative sequence voltage system by symmetrical components method, calculating first, second and third specified currents for input into network first, second and third phases, wherein calculation of first, second and third specified currents is made depending on, at least, one value of positive-sequence voltages system and/or negative-sequence voltages system.EFFECT: technical result is provision of asymmetric energy input into network for compensation of available in network asymmetry.14 cl, 3 dwg

Three-phase balun // 2612649
FIELD: electricity.SUBSTANCE: three-phase balun is proposed, wherein the three-phase three-legged transformer comprises two or three primary windings included counter in the zigzag . The free leads of the first windings are connected to the input and output terminals through the three-phase automatic switch, and the free leads of the second windings are connected into a common zero point to couple the phase loads. The throttle filter of the residual currents is included between the zero output of the power line and the zero output of the three-phase transformer.EFFECT: higher reliability.2 dwg

Wind-driven power plant and method of electrical energy input // 2605446
FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering and can be used to feed electric power into electric power, three-phase network. In wind-driven power plant and method of feeding of electric energy to electrical input three-phase network (8) the following stages are performed: electric current input by unit (2)for input of energy in point (60) of connection to network, detection of asymmetry in network (8) of power supply, in particular, negative-sequence system components in network (8) of power supply, Input to network (8) of power supply asymmetric current component for at least partial compensation of recorded asymmetry, input of asymmetric current component is performed so that unit (2) for energy input at that acts as consumer.EFFECT: technical result is increase of quality of electric power network.12 cl, 5 dwg

ethod for balancing of phase currents of three-phase four-wire line and device for its implementation // 2598760
FIELD: electrical engineering.SUBSTANCE: field of application: electrical engineering. According to the method phase voltage signals, current signals of line zero wire and current signals of load zero wire are received, then the current connection of phase wires of load to phase wires of line are changed, as one of the three technically available ABC connections, CAB and BCA, onto one of the other two connections. For the actual and two other connections of phase conductor of single-phase load to phase wires of line or the other two connections of phase conductors of three-phase load to phase wires of line with the same sequence of alternation of phases, as the actual connection, value of asymmetry of phase currents of line with its feed side is determined and the next selected load connection is the load connection with the least value of asymmetry.EFFECT: technical result - reduction of unbalance of phase current of line.10 cl, 4 dwg

Voltage regulation method on alternating current traction station // 2592862
FIELD: electrical engineering. SUBSTANCE: method relates to a. c. power supply system of electric railways, namely to controlling voltage by means of transformer with on-load tap changer (OLTC) and series capacitance unit with uncontrolled and controlled sections included in the suction line. To achieve technical result it is necessary to measure input inductive resistance of the substation to buses 110 (220) kV and at current of suction line less than rated current of nonregulated section of series capacitance unit to determine the practicability of switching on (off) of controlled section of series capacitance unit for approximation of resistance of series capacitance unit to resistance of the substation. EFFECT: technical result - increase of efficiency of joint operation of on-load tap changer (OLTC) and series capacitance unit with allowance for the balancing properties of series capacitance unit. 1 cl, 1 dwg

Device for uniform distribution of single-phase load by phases of three-phase network // 2591040
FIELD: electrical engineering.SUBSTANCE: invention can be applied to electrical engineering. Device for uniform distribution of single-phase load by phases of three-phase network, comprises primary transformer windings and connected opposite secondary transformer windings, wherein number of primary windings is two, primary windings are connected in series and in concord, and are connected to phase inputs of device so that point of primary windings connection and two other their outputs are connected to appropriate input of one of three phases; number of secondary windings is also two, and their in-series connection is connected between two outputs of device.EFFECT: technical result is reducing material consumption, and weight and dimension parameters of device.1 cl, 2 dwg

Device to compensate high harmonics and correct grid asymmetry // 2573599
FIELD: electricity.SUBSTANCE: device intended to compensate higher harmonics and grid asymmetry comprises an inverter, an accumulating capacitor, an output smoothening passive filter and a control system controller, at the same time the control system controller is equipped with a sensor of filter current, a sensor of grid current, a voltage sensor, a pulse shaper on the basis of relay controllers with variable width of hysteresis, phase converters of current and voltage, a unit of phase synchronisation, and a controller of accumulating capacitor voltage. The controller of the control system is equipped with a unit detecting components of negative- and zero-sequence currents and phase correction unit for asymmetric current components, at that input of the unit detecting components of negative- and zero-sequence currents is connected to output of grid current sensor, while output of the unit detecting components of negative- and zero-sequence currents is coupled to input of the phase correction unit for asymmetric current components, which is also connected to output of the phase synchronisation unit, at that output of the phase correction unit for asymmetric current components is coupled to input of the pulse shaper.EFFECT: reduced distortion factor in sinusoidal shape of the grid current and voltage curves.1 dwg

Three-phase balancing device and method of its control // 2567747
FIELD: electricity.SUBSTANCE: three-phase balancing device comprises a unit of power rectifiers, gap choke, LC-filter of high frequencies, rectifiers control unit that includes network analysis unit and rectifiers switching control unit. According to the method signal from the network analysis unit are supplied to the rectifiers switching control unit, which extracts reverse sequence components and generates level-quantitised sinusoidal signals, matched in phase completely with sinusoids of negative-sequence currents and required for their further compensation. Thereupon phase with maximum negative-sequence current is identified and switched on, simultaneously permanent switching of two remaining phases is performed, which is proportional to current values of these phases with high frequency, and respective switching of rectifiers is performed so that current through the above rectifiers and gap choke passes in one direction.EFFECT: increased operational speed and energy performance, improved electromagnetic compatibility.2 cl, 9 dwg, 1 tbl

Aircraft power supply method and device (versions) // 2554723
FIELD: electricity.SUBSTANCE: group of inventions is related to above-ground structures for tethered aircraft. The first version of a power supply method for an aircraft with a tether line is characterised by the fact that power supply from the ground is carried out with high voltage of 0.1-10 kV by converting the voltage of the ground power supply source from 12-380 V to 0.1-10 kV and then transmitted through a transmission line with the further conversion of the voltage from 0.1-10 kV to 12-380 V. The second version is characterised by transmission of power from the ground in a resonant way at the high frequency of 1-25 kHz by the conversion of the ground surface in the voltage and frequency from 12-380 V to 0.1-10 kV, 1-25 kHz and transmission through transmission lines with the further conversion of the cable line voltage from 0.1-10 kV up to 12-380 V. Each version of the power supply device is characterised by the usage of the respective voltage converters.EFFECT: group of inventions is oriented to the increase of the power supply range and altitude.4 cl, 2 dwg

Voltage balancer in three-phase network // 2552377
FIELD: electricity.SUBSTANCE: invention relates to the electrical engineering. The device is intended for improvement of electric energy quality in regard to unbalance level in power networks with voltage of 0.4kV. It eliminates voltage unbalance due to vector subtraction of zero-phase-sequence voltage from voltage for all the three phases; to this end each of three groups of in-series secondary windings of step-down single-phase four-winding transformers with transformer ration equal to three is connected in series to wire of the respective phase so that voltage added to the line is subtracted by geometric vectors from voltage of the respective phases. The device is connected to the line break; it may be used for improvement of electric energy quality both for individual devices and their groups in regard to unbalance level. The balancer consists of three step-down single-phase four-winding transformers (1) with one primary (2) and three secondary (3) windings, input terminals (4), output terminals (5).EFFECT: simplification of design, improvement of reliability and efficiency.1 dwg

Device for voltage recovery and balancing at double-phase open fault in network // 2551351
FIELD: electricity.SUBSTANCE: device comprises network terminals, three fast-operate fast-release voltage relays with closing and opening contacts, seven repeater relays per a phase with closing and opening contacts, three phase-recovering capacitors, three phase-shifting chokes, three phase-compensating capacitors, terminals for the connection of a three-phase load and a power supply source. The voltage relays are coupled to phase voltage of the respective phases in the network, the phase-recovering capacitors are coupled to linear voltage, at that each of the capacitors is connected in series to an opening contact of the repeater relay of the respective phase, each of the phase-shifting chokes is shunted by the closing contacts of the first and second repeater relays of the respective phase and by the in-series closing contacts of the third and fourth repeater relays of the respective phase, the repeater relays are connected to the negative output of the power supply source directly and to the positive output through the closing contacts of the voltage relay respectively. Each phase-compensating capacitor is shunted by the closing contacts of the fifth and sixth repeated relay of the respective phase and the phase-shifting capacitor of each phase is coupled between the same phase of the network and the phase next to the retarding phase through the opening contact of the seventh repeated relay of the respective phase.EFFECT: faster operation and bigger power of the device.1 tbl, 1 dwg

ethod of balancing of phase currents of three-phase four-wire line and device for its implementation // 2548656
FIELD: electricity.SUBSTANCE: in the method which assumes switch-over, at least, of part of single-phase loads to the least loaded phase for each switched-over single-phase load in the place of its connection to the line the values of active power corresponding to each phase voltage and current of zero wire of the line without considering the current of single-phase load are determined, and as the least loaded phase the line phase with the maximum value of the absolute value of active power is accepted the sign of which is opposite to the sign of active power of the most loaded phase. The device implementing the method contains the switching unit (1), four inputs (7, 8, 9 and 10) which are inputs of the device and are used for connection to phase wires F1, F2, F3 and zero wires N of the line, and two outputs (11) and (12) of the switching unit are used as the device outputs and are intended for connection of the single-phase load. The device also contains the current sensor (3) connected to zero wire N of the current line, and the first (4), the second (5) and the third (6) phase voltage sensors connected to device inputs, and also the unit 2 for determination of the least loaded phase the output bus (20) of which is connected to the control input of the switching unit 1. The unit (2) for determination of the least loaded phase contains the multichannel analogue-digital converter (17) connected to the input (19) unit (18) of digital signal processing. Inputs of the multichannel analogue-digital converter (17) are connected to the first (13), to the second (14), to the third (15) and to the fourth to inputs of the unit (2) of determination of the least loaded phase the output bus (20) of which is the output of the unit (18) of digital signal processing.EFFECT: decrease of disbalance level at which the balancing of phase currents is performed, simplification of implementation and improvement of operational reliability.5 cl, 2 dwg

ethod of power supply in three-phase power mains // 2543988
FIELD: electricity.SUBSTANCE: invention is used in electrical engineering. The method consists in following stages: formation of the component of the positive phase sequence system, intended for power supply, formation of the component of the negative phase sequence system, intended for power supply, superposition of the component of the positive phase sequence system and the component of the negative phase sequence system with obtaining of supply current, and supply of such composite current into a three-phase mains.EFFECT: decrease of non-symmetry in three-phase mains.12 cl, 5 dwg

Device for earth fault current compensation in three-phase electrical networks (versions) // 2524347
FIELD: electricity.SUBSTANCE: invention is used in electrical engineering. The device represents an earthing bipole - a tracking width-modulated voltage converter (a tracking PWM converter) attaching the neutral of the network feeding transformer to earth and forming lagging current for compensation of leading capacitance current of single-phase fault to earth, as well as a neutral current sensor, a network voltage transformer, a clock signal generator for measurement of network capacity and a calculation unit for determination of the required admittance of the above bipole. In addition to a common set of functional units, the tracking PWM converter is equipped with a current setting unit, the inputs of which are represented by neutral voltage and the required admittance, and the output of which is represented by current demand supplied to the current control input of the tracking PWM converter, and transfer function of the current setting device provides for lagging phase shift of about 90 degrees on network frequency.EFFECT: improving quick action and enlarging functional capabilities.9 cl, 46 dwg

Three-phase balancing device // 2521864
FIELD: electricity.SUBSTANCE: invention relates to electric engineering. The invention claims a three-phase balancing device where a three-phase three-leg transformer contains windings connected in an opposite staggered way. Free leads of the first windings are connected to output terminals and free leads of the second windings are connected into a common zero point to couple phase loads. In each phase there is one or two in-series voltage adding windings coupled through a two- or three-position switch in sequence with load at the side of the supply mains.EFFECT: provision of the phase voltage balancing.1 dwg

Control method and control device used for shunting of power supply units // 2518093
FIELD: electricity.SUBSTANCE: control method for shunting of power supply units includes the following steps: measurement of the first three-phase output eclectic signal; calculation of the first direct and reverse sequences of the first three-phase output eclectic signal; generating of the preset components for direct and reverse sequences of phases in order to perform automatic compensation for the components of the first direct and reverse sequences thus outputting components of the second direct and reverse sequences; summing-up of the second direct and reverse sequences and output of the second three-phase output eclectic signal in the preset mode.EFFECT: reducing output voltage ripple.10 cl, 10 dwg

Three-phase alternating current generating system with voltage inverter // 2513113
FIELD: electricity.SUBSTANCE: invention is related to the field of electric engineering and power electronics and can be used for manufacturing of HV three-phase alternating current generating systems for aircraft. The suggested three-phase alternating current generating system with voltage inverter contains a three-phase synchronous generator, a static electric energy transducer based on a three-phase bridge rectifier which inputs are connected to outputs of the synchronous generator, two filter capacitors in the direct current link connected in-series and switched on in parallel to the output terminals of the rectifier and a three-phase bridge voltage inverter which inputs are connected to the rectifier outputs and outputs are connected to inputs of three low-frequency LC filters; a neutral load wire of the generation system is connected to the average point of filter capacitors in the direct current link; an inductance coil is connected by its one output to the neutral load wire of the generation system and by its other output to the neutral wire of the stator three-phase winding of the synchronous generator.EFFECT: reducing electric losses in elements and improving efficiency ratio of the system as a whole.2 dwg

Voltage stabiliser for power supply system // 2509400
FIELD: electricity.SUBSTANCE: voltage stabiliser for a power supply system, which stabilises load of active power, comprises the first AC-DC and DC-AC converter to convert between AC power and DC power; and a nickel-metal-hydride battery located between and connected to a high-voltage cable at the DC side of the first AC-DC and DC-AC converter and a low-voltage cable at the DC side of the first AC-DC and DC-AC converter.EFFECT: reduced mass and dimension parameters of a device.10 cl, 17 dwg

Balancer for three-phase networks with neutral wire // 2490768
FIELD: electricity.SUBSTANCE: balancer is purposed to improve quality of current and voltage balancing in three-phase networks with neutral wire due to self-adjustment of power in case of current change in the neutral wire. The device contains additionally two power stages and automatic control circuit operating as current function of the neutral wire.EFFECT: improving quality of adjustment due to detuning parameters of the suggested device from current unbalance in the network of 0,38 kV present at the moment.2 dwg

Power supply device for immediate electric heating of pipeline system // 2477555
FIELD: electrical engineering.SUBSTANCE: power supply device (100) for immediate electric heating of a pipeline system contains basically a three-phase transformer (2), a symmetrisation unit (14), a compensation unit (22). The three-phase transformer (2) is adapted for supporting a single-phase load connected between the first phase (6) and the second phase (8) of the transformer (2). The transformer (2) contains at least one first tap switch (10) on the high-voltage side (12) of the transformer (2). The symmetrisation unit (14) contains the first capacitor means (16) connected between the first phase (6) and the third phase (18) of the transformer and an inductor means (20) connected between the second phase (8) and the third phase (18) of the said transformer (2). The compensation unit (22) contains the second capacitor means (24) connected between the first phase (6) and the second phase (8) of the transformer (2). The first tap switch (10), the first capacitor means (16), the second capacitor means (24) and/or the inductor means (20) are adapted for variation under load.EFFECT: changing the value of capacity and inductivity of the corresponding capacitive and inductive means under load and optimisation under load on a real time basis.7 cl, 4 dwg

Three-phase filter balancing device // 2459337
FIELD: electricity.SUBSTANCE: three-phase filter balancing device comprises input and output terminals, to which a transformer is connected, having two groups of primary windings connected as serially and oppositely into a "zigzag". A neutral of the first group of primary windings is connected to a zero wire of a supply network and non-linear phase loads. A neutral of the second group of primary windings is an artificial neutral for linear phase loads.EFFECT: reduced losses of power and its higher quality by separation of zero sequence currents passage paths for these loads.1 dwg

ethod to increase quality and efficiency of electric energy usage (version 1) // 2459336
FIELD: electricity.SUBSTANCE: level of a specified higher harmonics in a power flux picked by a non-linear load is reduced by extraction of its energy in the form of an equivalent energy of sequence of unipolar periodically repeating width-modulated current pulses, by means of a fully controlled pulse-width-modulation rectifier of a transistor type, which is used to control a modulating signal proportional to the current of the specified higher harmonics. The extracted energy of the higher harmonics is disposed of, by means of its usage for supply to a DC load and accumulation in the form of a DC energy.EFFECT: reduction of higher harmonic components levels in a supplying power system and increased efficiency of power usage.1 dwg

Three-phase balancing device // 2453965
FIELD: electric engineering.SUBSTANCE: application: in electric engineering. The three-leg transformer in three-phase balancing device is comprised of three coils with the first, nearest to leg, and the utmost leg being connected in series and in accord between each other and the total number of windings in coils is equal to the number of windings in the second coil to be opposite connected in zigzag pattern. Free terminals of the first coils are connected to input and output clips, while free terminals of the second coils are integrated in one common zero point to connect phase loads. Semi-conducting a.c. switch is energised between zero terminal of power system and three-phase transformer.EFFECT: improved reliability and reduced resistance of zero-sequence current.2 cl, 1 dwg

ethod for supplying power from n-phase power supply (variant 2) // 2442263
FIELD: electrical engineering.SUBSTANCE: according to the method, both reactive power and the active power component of the balanced phase group are used to supply DC load. Upon that, initially, the reactive power component is extracted from n-phases of the power grid, and then the active power component is extracted from at least one of the grid's phases, the active power component consists of a balanced phase group, via balancing currents. Furthermore, the power from reactive and active currents is extracted by means of a fully controlled solid state PWM rectifier, with phases being individually controlled via corresponding modulating signal. This power is extracted in the form of equivalent power of unidirectional repeating width-modulated current pulse sequence.EFFECT: increase of power usage efficiency by reducing its non-productive losses.1 dwg

ethod of load supply from n-phase power supply system (version 1) // 2436216
FIELD: electricity.SUBSTANCE: power required for supply of DC load is extracted with the help of a fully controllable n-phase WPM-rectifier of transistor type by means of balancing currents, at least from one phase, making a group of balanced phases, - so that the current that remained in each phase of the specified group picked by a non-balanced load, has a module value equal to either the one that has been previously determined or equal to the value of the current module in the reference phase, which has been previously selected from n-supplying phases of unbalanced system of power supply according to the condition of the maximum value of the current module.EFFECT: increased efficiency of power usage by reduction of non-efficient losses in power flow caused by unbalance of phase currents.1 dwg

ethod of balancing of traction-feeding transformer load // 2413351
FIELD: electricity.SUBSTANCE: substance of method consists in distribution of highest load of lagging or leading phases of contact network at non-loaded phase of traction-feeding transformer. At that the highest capacity of one of phases of contact network is identified, voltage picked up from non-loaded phase of traction-feeding transformer is rectified and converted with the help of inverter driven by according phase of contact network, and step-up transformer into sinusoid voltage with frequency equal to frequency of the main harmonic of network, and specified voltage is supplied to according phase of contact network. Loading of non-loaded phase of traction-feeding transformer is carried out via rectifier and inverter, only at one phase of contact network, which makes it possible to transfer electric capacity to that phase of contact network, in which unit of contact network capacities comparison has identified the highest capacity.EFFECT: increased efficiency of using capacity of traction-feeding transformer, reduced volumes of distortion capacity generation in the form of active power by reverse sequence and active power by high harmonics.2 dwg

Device for single-phase automatic repeated connection of ultrahigh voltage lines // 2400003
FIELD: electricity.SUBSTANCE: device comprising serially connected reactor switches and shunting reactors, neutral of which includes parallel compensating reactor and breaker, capacitor batteries are additionally connected serially with shunting reactors in each phase from the side of neutral leads, shunted with switches.EFFECT: reliability improvement.2 dwg

ethod of automatic balancing adjustment of currents in multi-phase system by specified phase // 2393610
FIELD: electricity.SUBSTANCE: improved efficiency of method implementation is achieved due to multi-phase system balancing against specified phase, or phase with load current close to mean current, or less loaded phase defined as reference phase. By the method, balancing is implemented by generation of pre-formed currents by means of additional power source in each of remaining (n-1) phases, so that in each balanced (n-1) phase of the main n-phase network, the geometrical sum of currents generated in balanced phase and with load current is equal modulo to current in reference phase, and angle formed by the current of reference phase and total current of balanced phase following the reference phase at forward sequence of phases, as well as between total currents of neighbouring (n-1) balanced phases is equal to electrical degrees.EFFECT: improved efficiency of multi-phase system balancing due to increased response and simplified implementation, extended application sphere, improved economy.1 dwg

ethod of automatic adjustment of currents of multi-phase system as to one of phases at combined power takeoff // 2390903
FIELD: electricity.SUBSTANCE: method consists in generation by means of additional power source to each of the rest (n-1) phases of currents, which are pre-formed so that in each adjustable (n-1) phase of the main n-phase network the geometrical sum of currents - generated to adjustable phase and with current of its load can be equal as to current modulus to the current equal to current in reference phase, and the angle formed with the current of the latter and with total current of adjustable phase following the reference one at forward sequence of phases, as well as between total currents of neighbouring (n-1) adjustable phases can be equal to electrical degrees. At that, power takeoff to the above additional power source is performed from combination of at least two minimum loaded phases which are pre-determined by the condition of decreasing asymmetry in adjustable n-phase system.EFFECT: increasing quick operation, economy, simplifying the implementation and enlarging application range.1 dwg

Balance-to-unbalance traction-feeding transformer // 2374715
FIELD: electricity.SUBSTANCE: balance-to-unbalance traction-feeding transformer includes three-leg core, three-phase symmetric primary winding and three-phase secondary winding. Secondary winding is connected as per three-rayed zigzag scheme, each ray of which consists of two in-series connected similar windings located on different core legs. Each of the windings of one of the rays has voltage which is 2.5-3.0 times less than that of each of the windings in two other rays. Transformer is converter of three-phase voltage into symmetric two-phase one with phase displacement angle between voltage vectors, which is close to 90.EFFECT: simplifying the design and economy of materials.1 dwg

Current phase-to-phase distributor // 2365019
FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering, and can be used for phase-to-phase distribution of current in magnetically unstable three-phase signals, for example for neutralisation of zero-sequence harmful effects on current feed circuit in three-phase AC-to-DC and DC-to-AC voltage transformers. Proposed device comprises the transformer with its two phase windings connected, each by one output terminal, to zero input terminal, while their other output terminal is connected to appropriate phase input terminal. The transformer comprises two magnetic cores with phase windings connected in series and furnished with central tap. The said windings have their central and extreme free terminals connected to zero and common phase input terminals, respectively. Note here that central output terminal divides the number of turns in each phase windings into unequal parts, smaller ones being connected to opposing phase input terminals.EFFECT: possibility to use two single-phase transformers with various-shape magnetic cores instead of three-phase transformer.1 dwg

Network protection from third harmonics current effects // 2353040
FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering and may be used for hardware designing to improve quality and reduce voltage and electric power losses, when such power is transmitted in three-phase four-wire electric networks due to reduction of anharmonicity and asymmetry. Protection device generates 150 Hz frequency current from phase currents. This current is immediately introduced to harmonics 3 current of neutral working wire in opposite phase.EFFECT: compensating highest current harmonics flowing along neutral conductor.2 cl, 2 dwg

Device of shunt compensation for power transmission line // 2351050
FIELD: electrics.SUBSTANCE: invention concerns current power transmission equipment, particularly high-voltage power transmission. Device includes reactive shunts connected by reactive switches to line, with additional special reactive shunts connected to the line in star network pattern with unearthed neutral conductor.EFFECT: enhanced shunt compensation of power transmission line in low load mode, stability and reliability in elimination of single-phase short circuits at single-phase reclosing.1 dwg

ethod of electric energy quality improvement and associated device // 2340991
FIELD: power production.SUBSTANCE: when non-sinusoidal shape of supply voltage is decreased, electric power is distributed between electronic devices distorting the shape of supply voltage and electronic devices improving the shape of supply voltage during the semi-wave of supply voltage. Device is connected in parallel with consumers introducing distortions of voltage shape. Main voltage is supplied to the device input. Device includes serial connection of phase-shifting chain, control pulse shaper, dc power supply and power switcher, which connects consumers improving the shape of supply voltage to the mains at a certain period of time.EFFECT: improvement of supply voltage shape and simplification of device design.2 cl, 4 dwg

Balancing three-phased to one-phased voltage transformer // 2321133
FIELD: electric engineering, possible use for powering various equipment.SUBSTANCE: the balancing three-phased to one-phased transformer of alternating voltage contains input and output contacts, to which a transformer is connected which has primary windings in all three phases and two secondary windings in phases A and C. Primary windings are connected in a "zigzag". Windings of phases A and B, B and C, and also C and A are connected respectively. Secondary windings in phases A and C are coupled oppositely and are connected to output contacts.EFFECT: reduction of stabilized power and asymmetry of primary currents and voltages.1 dwg

Three-phased balancing device // 2314620
FIELD: electric engineering, possible use in power circuits of various equipment.SUBSTANCE: three-phased balancing device contains input and output clamps of powering networks. To output clamps, three-phased transformer is connected, primary windings of which are oppositely coupled in a zigzag. In accordance to the invention, between input and output clamps of powering network, first three-phased automatic switch is coupled, having an independent release. Serially with primary windings of three-phased transformer, second three-phased automatic switch is coupled. As zero contact for connection of phase loads, zero contact of primary windings of three-phased transformer, coupled oppositely in a zigzag, is used. Control block is connected serially to independent release, coupled between output clamp of one of the phases and zero contact of powering network, and ensures supply of voltage to independent release and activation of first automatic switch on disabling of second automatic switch.EFFECT: increased reliability when powered from three-conductor or four-conductor powering network.3 dwg

ethod for protecting power consumers against higher harmonic components // 2294044
FIELD: electrical engineering.SUBSTANCE: proposed method used to enhance quality characteristics of electrical energy supplied to users susceptible to impact of negative factors of electrical-energy higher harmonic components includes generation of higher harmonic components of current in network which are acting in phase opposition relative to higher harmonics of supply mains.EFFECT: enhanced quality characteristics of electrical energy supplied to users.1 cl, 3 dwg

ethod for protecting power consumers against impact of higher-harmonic components // 2289876
FIELD: electrical engineering.SUBSTANCE: proposed method intended to enhance power quality characteristics for users subject to negative influence of higher harmonic components includes generation of circuit current higher harmonic components which are in phase opposition to higher harmonics of supply mains using electrical energy of independent power supply.EFFECT: enhanced electrical energy quality characteristics for power consumers.1 cl, 3 dwg

ethod for balancing load of traction transformer // 2253931
FIELD: power engineering.SUBSTANCE: method allows to fully utilize power of traction transformer due to loading its free phase by rectifiers and inverters, one of which is lead by leading phase of contact network, and second one of late phase, which allows to transfer electric energy to contact network, to exclude idling mode, to provide for lower asymmetry on reverse series in power grid 220 (110) kV, and also decreases level of higher harmonics.EFFECT: higher efficiency, lowered values of quality coefficients of electric energy - asymmetry coefficient of reverse series and values of higher harmonics.2 dwg

ethod for computer-aided on-line measurement of current and voltage unbalance level // 2249286
FIELD: electrical and power engineering.SUBSTANCE: proposed method intended for measuring current and voltage unbalance level and organizing on-line impact on them in three-phase power systems characterized in low quality of their power characteristics includes measurement of unbalance level with respect to reverse and zero sequence of both line and phase voltages and currents at frequency of each harmonic component. Frequency at which unbalance in analyzed characteristics occurs is found. Results obtained are used to generate control signal by correcting devices.EFFECT: facilitated procedure.1 cl, 5 dwg

The way to improve the quality of electric energy // 2237334
The invention relates to power engineering and can be used to improve electric power quality in electrical systems, including the electrical systems of electrified Railways

The filter is symmetrical components of the electrical signal // 2209441
The invention relates to measurement devices, and more specifically to devices designed to highlight the components of the negative sequence voltage, and can be used in the composition of measurement devices, protection and alarm systems three-phase alternating current systems
 
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