31 results about "Scott transformer" patented technology

The invention relates to a method and a device for improving supply voltage at the tail end of a long supply arm of a heavy haul railway. The method is characterized in that: a direct hanging thyristor controlled reactor (TCR)-type static var compensator (SVC) is arranged at the outlet end of a Scott main transformer; a plurality of groups of step-down thyristor switched capacitors (TSCs) are arranged at an autotransformer (AT) end at the tail end of the long supply arm at the same time; and the tail end of the supply arm is compensated by using a step-down TSC grouping mode so as to improve the supply voltage at the tail end. The Scott transformer is arranged in a power supply system of the AT of the heavy haul railway and is provided with a T seat outlet end and an M seat outlet end; the T seat and M seat outlet ends of the Scott transformer are provided with a set of SVC devices consisting of a TCR branch and two fixed capacitor branches FC1 and FC2, wherein FC1 is identical to the FC2, so that the whole SVC can be subjected to derating compensation when the set of devices are maintained; and simultaneously, the step-down TSC groups are arranged in uplink, respectively set as three-time and five-time filter branches, wherein the uplink is a heavy climbing line, and downlink is a descending line.

The invention discloses an enhanced type railway power regulation device which comprises a VSC1, a VSC2, a capacitor and an enhanced type controller. The enhanced type railway power regulation device is suitable for a traction substation adopting an SCOTT transformer, electrical quantity of the high-voltage side of the SCOTT transformer is collected directly, closed-loop comprehensive compensation is carried out on negative-sequence currents and reactive power injected into a power grid according to a decoupling principle, the AC side of the VSC1 and the AC side of the VSC2 are connected to the two low-voltage ends of the SCOTT transformer, active power is transmitted through DC circuits, and the reactive power of the VSC1 and the reactive power of the VSC2 are regulated respectively to enable the negative-sequence current injected into the power grid from the high-voltage side to be zero and to improve a power factor. Compared with an existing railway power regulation device adopting an indirect control mode, the enhanced type railway power regulation device is better in compensation effect, and has broad application prospect along with the rapid development of electrified railways, high-speed rails, urban subways and other projects of China.

The invention provides a method for converting a digital signal to a synchro / rotary transformer signal. A circuit for realizing the method comprises a digital / sine-cosine signal converting circuit and an electronic SCOTT transformer. The digital / sine-cosine signal converting circuit receives 16-bit natural binary digital angle measurement and a reference signal with a frequency of DC-1 kHz, generates a high-precision 6.81-V sine-cosine signal, and sends the high-precision 6.81-V sine-cosine signal to the electronic SCOTT transformer; a line-line voltage 11.8-V synchro signal, a line-line voltage 11.8-V rotary transformer signal or a line-ground voltage 6.18-V sine-cosine signal is output by the electronic SCOTT transformer in different jumper manners; a conversion precision is + / -1 arc minute, and a signal frequency is DC-1 kHz; and a type of the output signal is a synchro / rotary transformer / sine-cosine signal programmable type. The method provided by the invention has the advantages of reasonable design, high precision, more output types, wide working frequency, strong adaptability and the like.

The invention is an energy quality controller for a traction power substation, composed of a three-phase converter and a Scott transformer, two orthogonal single-phase output power supplies are connected with two single-phase output ends of the Scott transformer, respectively, the three-phase converter connects in series with a three-phase output end of the Scott transformer, where the three-phase converter is an inverter with capacitor in parallel with the DC bus. It controls two power supply arms of the traction transformer at the same time and can effectively compensate harmonics in drawing electric network, reactive power and negative sequence current.

The invention provides a power electronic transformer, relates to the technical field of electrified railway traction power supply, and solves the problems of dynamically controlling negative-sequence current, compensating reactive power and electrical sectioning of a traction network. The power electronic transformer is an input cascade structure two phase-single phase power electronic transformer, which is formed by cascading n converter modules; when the power electronic transformer is cooperated with a Scott transformer, an alpha phase output A1P' is connected with a positive input end A1P of a single-phase power electronic transformer A by a linking reactor LA; a beta phase output B1P' is connected with a positive input end B1P of a single-phase power electronic transformer B by a linking reactor LB; a negative input end AnN of the transformer A is connected with a negative input end BnN of the transformer B; when a parallel output structure is used, a positive output end a1P of the transformer A is connected with the positive output end b1P of the transformer B; the negative output end anN of the transformer A is connected with the negative output end bnN of the transformer B; the negative output end anN of the single-phase power electronic transformer A is connected with a rail; and, the positive output end b1P of the transformer B is connected with a contact system by the reactor.

The invention provides a digital-shaft angle signal converting method. The method is characterized in that: a circuit realizing the method comprises a digital-sine and cosine signal converting circuit, an electronic wide-frequency and wide-voltage SCOTT transformer and a digital signal processor (DSP), wherein the digital-sine and cosine signal converting circuit consists of a subdivision circuit and a rough division circuit; the subdivision circuit is a resistance network digital / analogue (D / A) conversion circuit which is less than 16 bits; the rough division circuit consists of a precise resistance network, a precise operational amplifier and an analogue switch; and the electronic wide-frequency and wide-voltage SCOTT transformer consists of a mode operational circuit, a voltage amplitude value operational circuit and a power driving circuit. Full electronic technology is adopted by the digital-shaft angle signal converting method; a wide-frequency and wide-voltage differential synchro signal or rotary transformer signal can be output; the conversion precision is high; and the expandability is high.

A uniform voltage is applied to loads even to other than a multiple of three loads made of heating lamps connected in parallel to each other, without causing any burden on a primary side. The number of loads is divided into a multiple of three and a multiple of two. A three-phase AC voltage is applied to three primary windings, which are connected as a Y-connection or a Δ-connection. Secondary windings, which are each magnetically coupled to a primary winding of a plurality of three-phase transformers and have the same number of turns, are connected with the multiple of three loads. The number of turns of the M-seat primary winding of a Scott transformer is divided into two at a midpoint, to which an end of the T-seat primary winding having a number of turns equal to (√3) / 2 times that of the M-seat primary winding, is connected and to which the three-phase AC voltage is applied. The M-seat primary winding and the T-seat primary winding in at least one Scott transformers are each magnetically coupled with each of the secondary windings having the same number of turns. The multiple of two loads are connected to the secondary windings so that no secondary windings appear without a load connected thereto. Thus, an AC voltage can be uniformly applied to the heating lamps without increasing any burden on the primary side.

The invention relates to a traction transformer for Scott wiring. Outlet voltage on the secondary side of the conventional Scott transformer is 55 kV, and a 55 / 27.5 kV of outlet autotransformer needs to be arranged, so that the cost is high, the occupied area is large, the power loss is high, the equipment layout of the traction substation is complicated, and operation and maintenance cost is high. The traction transformer is characterized in that: a first principal post, a second principal post, a third principal post and a fourth principal post are sleeved with three concentric winding layers from the inner side to the outer side, wherein the first winding layer and the second winding layer which are sleeved on the outer sides of the first principal post and the second principal post are divided into power supply side windings and feed side windings respectively; one feed side winding is arranged on the outer layer of one power supply side winding, and another power supply side winding is arranged on the outer layer of one feed side winding; the first winding layer of the third principal post is provided with a power supply side winding, and the second winding layer of the third principal post is provided with a feed side winding; and the first winding layer of the fourth principal post is provided with a feed side winding, and the second winding layer of the fourth principal post is provided with a power supply winding. The traction transformer has a simple structure, meets design requirements and lowers design and production cost.

The invention provides an inverse Scott transformer. The inverse Scott transformer comprises a support, an M-transformer iron core and a T-transformer iron core, wherein the M-transformer iron core and the T-transformer iron core are disposed on the support. An M-variable high-voltage coil and an M-transformer low-voltage coil are arranged outside the M-transformer iron core, and a T-transformer high-voltage coil and a T-transformer low-voltage coil are arranged outside the T-transformer iron core. The M-transformer high-voltage coil is connected with the T-transformer high-voltage coil in series. The windings of the M-transformer low-voltage coil comprise a first winding, a second winding, a third winding and a fourth winding. The third winding is wound outside the first winding, and thefourth winding is wound outside the second winding. The first winding and the fourth winding are opposite in a winding direction, and the second winding and the fourth winding are opposite in a winding direction. The first winding is connected with the fourth winding, and the third winding is connected with the second winding. The four windings have the same number of turns. A winding of the M-transformer low-voltage coil is divided into four sections, wherein one section of two sections of the winding at the same phase is located at the inner side of the coil and the other one of the two sections of the winding at the same phase is located outside the coil, and standard transposition is carried out from the first layer to the second layer, thereby guaranteeing that the lengths of the windings of two phases in the M-transformer low-voltage coil are the same, and achieving the resistance balance.

The invention relates to a method for measuring the signal angle of a synchro. The method comprise: by using the directly measured voltage values between different signal lines of the synchro and according to the signal expression of the synchro or the transfer function of an electronic SCOTT transformer, deriving the angle formula of an arctangent function containing the voltage values; accordingto the distribution law of the signal function image of the synchro, determining the quadrants of the measured voltage values between the synchro signal; and transforming the angle formula accordingto the quadrants of the synchro signal in order to achieve angle measurement within a range from 0 to 360 degree. The measuring method has a wide voltage and frequency measuring range and high measuring precision. In addition, the measuring method can be realized by a software algorithm, can be installed on various smartphones, is convenient to carry and is especially suitable to be used for outdoor guarantee especially on ships.

The invention discloses an acquisition method and system for short-circuit parameters of three-phase asymmetric devices of a power system. For a power grid containing three-phase asymmetric power supply devices such as a single-phase transformer, a V / V wiring traction transformer, a V / X wiring traction transformer, a Scott transformer and an impedance matching balance transformer, when short-circuit fault analysis is performed, an open self-defined fault analysis platform is established, equivalent impedance of a three-phase symmetric part of the power grid and necessary parameters of variousthree-phase asymmetric devices are open, a script language is adopted to self-define a calculation process and calculation logic of a short-circuit current and voltage, and the self-defined script language is submitted to a script interpreter of an operating system to execute calculation to obtain a needed short-circuit current and voltage result. The method has openness and extensibility, can beflexibly extended according to a new equivalent model of the three-phase asymmetric devices and is suitable for the field of practical short-circuit fault analytical calculation of the power grid containing the three-phase asymmetric devices.

The invention discloses a single-phase / two-phase-to-three-phase power supply structure, and belongs to the technical field of power supply and distribution of a power grid. When a power transmission line is a single-phase power transmission line, a P terminal of an input end of a three-phase static var generator is connected with the power transmission line, a terminal A of an input port of a Scott transformer T base is connected with the power transmission line, and a terminal K of the input port of the Scott wiring transformer T base is connected with a terminal N of an output end of the three-phase static var generator. A terminal B of an input port of a Scott wiring transformer M base is connected with a terminal Q of the three-phase static var generator, and a terminal C of the inputport of the Scott wiring transformer M base is connected with a terminal N of the three-phase static var generator and is grounded. The three-phase ports a, b and c on an output side of a Scott wiringtransformer provide a three-phase symmetrical power supply for users.

The invention discloses a multilevel voltage regulation device. The voltage regulation device comprises a Scott transformer which comprises comprises four windings; every winding is connected with a choking saturable reactor; the voltage regulation device also comprises an auto-transformer; three phases of the auto-transformer are connected with three phases of the Scott transformer through a switch respectively. According to the voltage regulation device, the on-load voltage regulation levels are more, multiple power utilization requirements can be met, the drifting of a zero point of the primary side is reduced, and harmonic waves of a power grid are reduced.

The invention discloses an inverse Scott transformer with a harmonic elimination function and relates to the field of transformers. A high-order harmonic of a specific order often causes a problem that traction equipment cannot normally work or even gives a wrong control instruction. The inverse Scott transformer comprises a bracket, an M transformer core, a T transformer core and a harmonic elimination component group, wherein an M transformation network side coil and an M substation side coil are arranged outside the M transformer core; a T transformation network side coil and a T substationside coil are arranged outside the T transformer core; insulated fixing frames are arranged between the M transformer core and the T transformer core; the harmonic elimination component group is arranged on the insulated fixing frames and comprises a T transformer harmonic elimination inductor, an M transformer harmonic elimination inductor, star harmonic elimination capacitors, triangular harmonic elimination capacitors, star harmonic elimination inductors and triangular harmonic elimination inductors; and equal air gaps are kept between the harmonic elimination component group and the M transformer core and the T transformer core at two sides. According to the inverse Scott transformer, the high-order harmonic is eliminated, and the high-order harmonic is prevented from interfering withthe traction equipment, so that normal operation of the equipment is ensured.

The invention discloses a Scott transformer which comprises a transformer mounting frame (1). The Scott transformer is characterized in that an iron core (2) fixedly mounted in the transformer mounting frame (1) is arranged in the middle of the transformer mounting frame (1), a first transformer (3) and a second transformer (4) are arranged on two sides of the iron core (2) respectively, a high-voltage coil tail of the first transformer (3) is connected with a high-voltage coil central point of the second transformer (4), or a high-voltage coil tail of the second transformer (4) is connected with a high-voltage coil central point of the first transformer (3). By arranging the two independent transformers on the two sides of the iron core and connecting the high-voltage coil tail of one transformer with the high-voltage coil central point of the other transformer, the objective that a three-phase power source powers a two-phase industrial electric furnace is realized, and the Scott transformer is simple in structure, small in occupied area, convenient to use, economical, efficient and widely suitable for equipment needing two equal single-phase loads.

The invention relates to a basalt continuous fiber furnace with a bottom-inserted electrode, comprising a melting tank (2). The melting tank (2) is provided with a feed port (1); a rod molybdenum electrode (6) is inserted into the bottom of the melting tank (2), the rod molybdenum electrode (6) is sleeved with a cooling device, and the rod molybdenum electrode (6) is connected with a Scott transformer through a lead (9). It is possible to effectively improve melting efficiency of basalt.

The invention discloses a multi-output Scott transformer used for a subway. The multi-output Scott transformer is formed by connecting a two-legged single-phase M transformer with a two-legged single-phase T transformer through internal wiring. The structures of two main legs of the M transformer are symmetrical, and each main leg of the M transformer comprises a layer of low-voltage winding and alayer of high-voltage winding; the structures of two main legs of the T transformer are symmetrical, and each main leg of the T transformer comprises multiple layers of low-voltage windings and a layer of high-voltage winding. The low-voltage winding of the M transformer is in parallel, and the single-phase output voltage is 27.5 kV; the low-voltage windings of the T transformer is in series, thesecond to sixth windings are preferably selected for output, and the output voltage is 3 kV. The multi-output Scott transformer used for the subway is simple and reasonable in structure, low in lossand low in cost, the three-phase current on the high-voltage side is symmetrical, two-side feeding is achieved on the low-voltage side, a multi-output way of the T transformer is implemented, and power supply requirements of urban railway subway locomotives and special power supply requirements can be met.

The invention discloses an angle division test system and test method of a Scott transformer. The system comprises a signal generator; the input end of the digital transmitter is electrically connected with the signal generator, the signal generator provides an excitation source for the digital transmitter, and the input end of the Scott transformer is electrically connected with the output end of the digital transmitter; the voltage acquisition unit is used for acquiring voltage of the input end and the output end of the Scott transformer; and the angular score calculation unit is used for calculating the angular score value of the Scott transformer according to the voltage of the input end and the output end of the Scott transformer. The test system only comprises one special device of the digital transmitter, the composition is simple, the system cost is reduced, and the test accuracy is improved. The input angle is calculated through input voltage, and the output angle is calculated through output end voltage. Because the angle score is directly calculated by the input and output end voltages of the transformer and is not influenced by other equipment, the angle score is tested to be the angle difference of the transformer, and the accuracy of the test result is improved.

The invention discloses a traction power supply system and a method by application of a SCOTT transformer, wherein the traction power supply system comprises a first transformer, a second transformer, a first filter, a second filter, a power regulator, a current detection device and a controller; the current detection device is respectively connected with a first power supply wire and a second power supply wire, the controller is respectively connected with the current detection device, the first filter, the second filter and the power regulator, the power regulator is respectively connected with secondary sides of the first transformer and the second transformer, and the first filter and the second filter are respectively connected with secondary sides of the first transformer and the second transformer. By the adoption of the traction power supply system and the method, a comprehensive control on negative sequence, idle work and harmonic wave of the traction power supply system can be realized.

The invention discloses a Scott transformer with an adjustable separate-type bracket. The Scott transformer comprises L-shaped connecting plates, a first transformer body, two U-shaped fixing plates,a second transformer body and supporting mechanisms arranged on the lower sides of the U-shaped fixing plates, wherein connecting mechanisms are arranged at the two ends of each U-shaped fixing plate,each connecting mechanism comprises a clamping groove, a fixing hole, a nut rod, a threaded hole and a fixing lath, and the L-shaped connecting plates are installed at the two ends of the upper surface of each U-shaped fixing plate fixedly; the first transformer body and the second transformer body are symmetrically installed between the two U-shaped fixing plates, and the clamping grooves are formed in one ends of the U-shaped fixing plates. Through arrangement of the connecting mechanisms, users assemble and connect the U-shaped fixing plates conveniently; the fixing laths are clamped to the clamping grooves, so that the U-shaped fixing plates are convenient to fix; the connection between the U-shaped fixing plates is prevented from getting loose; the service life of the U-shaped fixingplates is prolonged, and meanwhile, the waste of the U-shaped fixing plates is reduced; the labor load of workers is reduced, and the installation speed of the workers is increased.

The invention discloses a Scott transformer with a skin effect. The Scott transformer with the skin effect consists of two single-phase transformers, the horizontally placed transformer is a main transformer, and the vertically placed transformer is a gradation transformer; a terminal A and a terminal S are arranged at the upper end and the lower end of a high voltage end of the main transformer respectively; a terminal C and a terminal B are arranged at the left end and the right end of a high voltage end of the gradation transformer respectively; the terminal S is connected with the midpointbetween the terminal B and the terminal C; the three terminals such as the terminal A, the terminal B and the terminal C are connected to a three-phase power grid U0; and an a phase and a b phase arearranged on two secondary side windings from the angle of three-phase to two-phase inversion respectively. According to the Scott transformer with the skin effect disclosed by the invention, the Scott transformer is free of circulation due to the fact that two phases on a low voltage side are free of electrical relation; and current on a high voltage side is a three-phase symmetrical system, a three-phase power supply can become into a two-phase power supply.

The invention discloses a non-linear passive control method for a multi-level railway power regulator. The power regulator is composed of a modularized, multi-level cascaded H-bridge and four filter inductors, which can be output from a Scott transformer. Terminals are connected directly, eliminating the need for an isolation transformer. This structure can be used in medium and high voltage occasions, especially for railway traction systems. A nonlinear control based on passive theory is adopted, which can perform fast current tracking control, maintain the stability and balance of the DC side voltage, and effectively improve the control performance of the system. The compensator can realize bidirectional conversion and flow of power, effectively reduce the negative sequence and harmonic components in the grid current, thereby improving the running performance of the locomotive and reducing the impact on the grid is of great significance.

The invention discloses a phase-missing self-protecting Scott transformer with a compensating iron yoke. The transformer comprises an iron core, multiple windings, damping wave-absorbing sheets, shuntcapacitors and the compensating iron yoke; the multiple windings are installed on an iron core main body, each winding comprises multiple winding wire turns which are connected in sequence, the damping wave-absorbing sheets are arranged between the adjacent winding wire turns, the parallel capacitors are connected to the windings in parallel, and the compensating iron yoke is connected with the iron core. When phase failure occurs, magnetic flux distribution at the iron core can be stabilized; in the phase missing state, phase failure work can still be conducted, that is to say, the self-protecting function is achieved; by arranging the shunt capacitors, the capacity of the transformer subjected to lightning and overvoltage shock can be improved; by arranging the damping wave-absorbing sheets, certain electromagnetic waves can be attenuated, absorbed and shielded, and the mechanical strength of the winding wire turns under electromagnetic oscillation is improved.

The invention discloses a Scott wiring transformer-based non-three-phase-to-three-phase conversion power supply structure. The structure comprises a power transmission line, a three-phase static var generator and a Scott transformer; the input ends of the Scott transformer are respectively connected with the output end of the three-phase static var generator and the power transmission line; the input end of the three-phase static var generator is connected with the power transmission line; and the three-phase port of the Scott transformer serves as an output port to provide a three-phase powersource for a user. With the structure of the invention adopted, a single-phase wire and a two-phase power transmission line can provide a three-phase power source for a user. The structure can be widely applied to power distribution system transformation and fault repair.