Medium frequency transformer load matchingwork station transformers are customized to meet customer requirements, and are available in various ratings to match the appropriate load. A new report on the medium voltage transformer market by fmi provides detailed insights on key factors affecting the growth of the medium voltage transformer market, along with historical trends, future growth prospects, market dynamics, competition analysis, and regionwise market breakdown. This contribution deals with a new configuration of traction converter with mediumfrequency transformer for multisystem suburban units and locomotives. Jan weigel, siemens ag final conference, brussels november 25th, 2010 medium frequency traction transformer panel 4 electric ac high speed services medium frequency traction transformer outcome of railenergy jan weigel, siemens ag. Traction, transformer rectifier general specifications. A wide variety of medium frequency transformer options are available to you, such as high frequency, rectifier, and current. As most other types of large transformers tend to be stationary, traction is probably the application that stands to benefit most from reducing the transformer s weight. However, for mediumvoltage highpower dcdc converters employing transformer for galvanic isolation, it is attractive to increase switching frequency in order to reduce the transformer size. This paper deals with new configuration of the traction converter with mediumfrequency transformer intended for ac trolley wire fed locomotives. Medium frequency mf transformers are a result of recent advances in resistance welding technology. Medium frequency transformer march 18, 20 by for frequencies of 500 hz to 10 khz that require a load matchingwork station transformer, see more details for further information on the jackson medium frequency transformer. Medium voltage high frequency transformer is the key element in terms of insulation safety, power density and efficiency. Medium voltage products technical guide the mvlv transformer.
Neeltrans product offering for traction application. Medium voltage technical guide electrical engineering portal. The presented configuration of the traction converter with medium frequency transformer is one of the promising solutions for the new generation of the locomotives and especially suburban units. Medium frequency transformer for traction applications. The load matchingwork station transformers are the. Standard insulation of transformers is 600 v with high voltage insulation optional. Soft switching converter with high voltage semiconductors abstract. Jan weigel, siemens ag final conference, brussels november 25th, 2010 medium frequency traction transformer summary high speed train. The medium frequency transformer also reduces noise levels. Medium voltage transformer market analysis 20192029. Design of inductors and high frequency transformers inductors store energy, transformers transfer energy. Mf transformer mf transformer increases the efficiency by 35% mf transformer saves mass axle loads. Mediumfrequency transformer rectifier units mf dc units and highfrequency rectifier units hf dc units mediumfrequency technology is the key joining process in the automotive industry.
The objective of this thesis is to present a high or medium frequency transformer design methodology for solidstate transformer sst applications. Analysis of electromagnetic force for medium frequency transformer. Design and optimization of medium frequency, medium. Design and optimization of medium frequency, medium voltage. Applications for sic mosfets and igbts are at similar power levels, but split as the frequency increases, as shown in figure 1. Transformer model in wide frequency bandwidth for power. The innovative use of power semiconductors in a core component such as traction transformers opens up new opportunities for rail markets around the world, and should be extendable across a range of other applications, said markus heimbach, head of the transformers business, a. The pet consists of the medium frequency transformer mf transformer and power electronic converters on the primary and secondary sides. Asymmetrical converters with medium frequency transformer. Mft, a frequency converter must be placed before the transformer as shown in. Main converter design with mf transformer main traction converter with medium frequency transformer new generation of multisystem locomotives, train sets and particularly suburban unit supplied from ac electrification system of 25kv50hz andor 15kv16.
Morgan lacey in 1925, based on a series of pamphlets entitled transformer abstracts that were. High frequency transformer design for solidstate transformers in electric power distribution systems. The converter equipment and traction transformers have to. Next generation train ngtcargo medium frequency transformer mft 4. One example is in traction transformers used for electric multiple unit and highspeed train service operating across regions with different electrical standards. Frequency and polarization transformer, second edition crc press book completely revised and updated to reflect recent advances in the fields of materials science and electromagnetics, electromagnetics of time varying complex media, second edition provides a comprehensive examination of current.
Furthermore we can get 3rd party short circuit testing on our units if required. A solidstate transformer is a galvanically isolated converter with power electronics interfaces on its terminals and isolation achieved at arbitrary high operating frequency of an integrated medium high frequency transformer. The companies featured in the following listing offer a comprehensive range of transformers. This work proposes a design and optimization methodology of a high power high frequency transformer accounting for the tuned leakage inductance of the trans.
Modern power electronics allow for a more efficient and much lighter alternative. Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency. Bidirectional currentfed medium frequency transformer isolated acdc converter. Pdf high frequency isolated power conversion from medium.
Phase transformer an overview sciencedirect topics. The mfts are very attractive for applications where full control of the power. A transformer is a passive electrical device that transfers electrical energy from one electrical. The phasor diagram for a single phase transformer with a 1. The presented configuration of the traction converter with mediumfrequency transformer is one of the promising solutions for the new generation of the locomotives and especially suburban units. Current transformers manufactured with current ratios from 4000. Frequency transformer an overview sciencedirect topics. Schaffner brings a wide experience in the traction rolling stock transformer business. Our quality program is certified, and maintained to iso 90012015. Nowadays, the typical railway traction chain, which operates under alternative power supplies, includes a heavy and bulky transformer. A highfrequency dcdc converter for the next generation.
As most other types of large transformers tend to be stationary, traction is probably the application that stands to. Medium voltagelow voltage mvlv transformer substations 1. You can also choose from single medium frequency transformer there are 301 suppliers who sells medium frequency transformer on, mainly located in asia. This paper deals with new configuration of the traction converter with medium frequency transformer intended for ac trolley wire fed locomotives. In order to reduce the size and the weight of the input transformer, a medium frequency topology, which involves switches in soft commutation mode, is proposed. At neeltran we design and manufacture our own rectifiertransformers and rectifiers. New configuration of traction converter with medium. Firstly, two mostly used transformer structures are compared. An epflmade prototype has been thoroughly tested and presented in several tutorials designed for experts from the academic and industrial worlds. Thus, an accurate knowledge of the transformer behavior in a wide frequency range is mandatory. Modelling and design of a medium frequency transformer for high. Transformers may require protective relays to protect the transformer from overvoltage at higher than rated frequency. Jan weigel, siemens ag energy efficiency days 2009 in tours france medium frequency traction transformer components 4qc cascade hv module multilevel or 2 level1. In the application for a traction drive 24, unidirectional power flow is enough.
Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency stages. Various topological proposals have been made and several demonstrators have already been deployed. The development of the smart grids leads to new challenges on the power electronics equipment and power transformers. Review of power electronic transformer in railway traction.
On the secondary side of the transformer, a rectifier converts this to the dc link voltage. The medium frequency transformer mft is one of the key components in the isolated dcdc converters 1,2,3,4 related to. Energies free fulltext effective permeability of multi. The voltage transformer can be thought of as an electrical component rather than an electronic component. Thanks to their compact size and exceptional power density, these transformers can be used, amongst other things, for particularly lightweight welding guns. Basic principles the best distribution system is one that will, costeffectively and safely, supply adequate electric service to both present and future probable loadsthis section. Power electronic traction transformer technology request pdf. Design of inductors and high frequency transformers. Since decades, we design and produce successfully high quality devices and solutions for the railway market. In the domain of electric traction, the demand for medium voltage supply systems of high power, compact size and reduced weight is growing.
The transformer noload current, i 0 consists of the physically inseparable magnetizing current and core loss components. Several solutions based on this principle were proposed these last years. To use a mediumfrequency transformer mft, a frequency converter must be placed before the transformer as shown in 3. Inductors need an air gap for storing energy, transformers do not. Solid state transformer for power distribution applications. Trafomec transformers and reactors main applications. Medium is home to thousands of independent voices, and we combine humans and technology to find the best reading for youand filter out the rest. Study on efficiency optimization of medium frequency.
Power electronics transformers pets have the advantages of small volume and light weight, so they have promising applications in rail transit traction systems substituting traditional transformers. Trafomec designs and manufactures traction transformers and electromagnetic assembly for all types of transport, railway and marine applications, supported by a wealth of experience in the industry proven internationally by a long track record. In this topology, a capacitor can be used between the bottom leg of the high frequency inverter and the transformer, forming an lc resonant circuit with the equivalent inductance of the transformer. Prasad enjeti the use of high power converters has increased tremendously. The proposed high frequency transformer isolated acdc converters used for feeding. A varying current in any one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across any other coils wound around the same core. Mediumfrequency transformer rectifier units mf dc units and high frequency rectifier units hf dc units medium frequency technology is the key joining process in the automotive industry. This contribution gives the main emphasis on the control of the primary voltage source active rectifiers, which. However, the earthed points will form a closed loop when the core and. Reliable efficient economical compact jackson transformer. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product. Fuses are often applied for short circuit protection and to disconnect the rc snubber should it fail. Design and optimization of hf transformers for high power. High frequency isolated power conversion from medium.
Modern power electronics allow for a more efficient. It is concerned to the primary serially connected singlephase voltagesource active rectifiers, which are directly connected to the trolley wire. Key enabler for internet of energy dc andor ac interfaces with high frequency isolation between medium voltage grid and renewables, distributed energy storage, ev, and dc or ac loads a platform enables unior bidirectional power flow with local autonomous. Being one of merging technologies, power electronic transformer pet is attracting more and more attentions. The mediumfrequency power transformer mfpt is one of the key elements of an isolated bidirectional dcdc converters in applications such as future alldc offshore wind farms, traction, and. This contribution deals with a new configuration of traction converter with medium frequency transformer for multisystem suburban units and locomotives. It is concerned to the primary serially connected singlephase voltagesource active rectifiers, which are dir.
In this paper, the authors propose a soft commutated topology based on dual structure association. A new multilevel converter with multiwinding medium frequency transformer. For frequencies of 500 hz to 10 khz that require a load matchingwork station transformer, see more details for further information on. Power electronic traction transformermedium voltage.
Traction converter with mediumfrequency transformer for railway. The major problem is to reach a high switching frequency with high voltage devices. Traction transformer core multipoint grounded fault on. The threephase topology is considered for high power applications where the high power density and high efficiency are. Request pdf on may 1, 2018, milos stojadinovic and others published modelling and design of a medium frequency transformer for high power dc dc. Medium frequency transformers mfts have achieved extensive attention since they are widely used in medium frequency energy conversion. Traction transformers and dc traction power supplies. One example is in traction transformers used for electric multiple unit and highspeed train. Medium frequency, as well as a variety of related products and services. If the frequency of a transformer is decreased by keeping voltage same, then what will be the new kva rating, magnetizing current and inductance, the induced voltage and loss of the transformer.
Solidstate transformers in locomotives fed through ac lines. Asymmetrical converters with medium frequency transformer isolation to interface low voltage dc to a medium voltage three phase grid. Thanks to the new semiconductors hvigbt, igct with high voltage capability, the multilevel topologies with medium frequency transformer become very attractive. Traction transformer 1 mva, superconducting, oilimmersed and medium frequency 191 traction transformer 1mva, superconducting, oilimmersed and medium frequency m. Transformer book is still in demand is a tribute to the publishers and to the authors who have carried the torch to light our way for 75 years. Furthermore, new dualpower and hybrid vehicles as well as the new modular multilevel converter topology for 162 3hz traction power supply will be covered. Our traction rolling stock transfomers stand for exceptional reliability and superior product attributes. Powerfrequency transformers may have taps at intermediate points on the winding, usually on the. Design and optimization of hf transformers for high power dc.
Their device is poised to enhance the flexibility and efficiency of tomorrows smart grids and dc power distribution networks. Compared with conventional line frequency transformers, medium frequency power conversion systems operating at the kilohertz range feature signi. Change the 5060 hz ac medium voltage to a high frequency voltage normally in the range of several khz to tens of khz. Then transformer insulation requirement is referred for 4160 v application according to ieee standard. Medium voltage technical guide basics for mv design according to iec standards. The magnetic cores are significantly different for inductors and high frequency transformers. In this case, it is assumed a multiphase transformer is included with the medium voltage drive and no isolation transformer is needed. Main goals reduction of weight and dimensions of vehicle electrical equipment. Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency stages are under consideration. The use of power electronic transformer presents several advantages, but new problems related with the application of high frequency voltage and current components come across. Institute of electrical and electronics engineers inc.
Medium frequency transformer for traction applications making. Welcome to the premier industrial source for transformers. A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to one or more circuits. The high frequency transformer approach has the advantages of small size and weight, at the expense of increased complexity.
Vlk 3 1katedra elektromechaniky a vykonove elektroniky, zapadoeska univerzita v plzni. Highfrequency transformer design for solidstate transformers in. Medium frequency transformer jackson transformer co. Medium frequency high power transformers, state of art and. Winding design of a high power medium frequency transformer. Thanks to the new semiconductors hvigbt, igct with high voltage capability, the multilevel topologies with medium frequency transformer become very. Effects of changing the frequency of a transformer. Mediumfrequency transformer rectifier units mf dc units. Epfl researchers have developed a compact and efficient medium frequency transformer.
Mediumfrequency transformers for smart grid applications. Medium voltage, medium frequency transformers mfts are much smaller in size and weight compared to conventional low frequency transformers. After the above mentioned components, there is the traditional traction drive. Get started 120 million curious readers and growing.
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