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Railway Current & Voltage Transducers Railway Current & Traction Catalogue Traction Voltage Transducers 1 Current and Voltage Transducers for Railway applications LEM solutions for traction electrical measurements This catalogue summarizes and to the auxiliaries (for air- experience has contributed to the most common LEM conditioning, heating, lighting, establishing LEM as a market product offerings for electrical electrical doors, ventilation, leader with worldwide presence railway measurements. It is our etc.). This includes the early to serve you and provide the business to support you with monitoring of the voltage efficient, safe and reliable both standard and customized network (changing by crossing operation of the railways. products to optimize your the European borders) to make application. the powers electronics working With more than 2 500 current accordingly. and voltage transducers in its Please contact LEM in your Although this is true for portfolio, LEM offers a complete region for assistance. on-board applications, LEM range of accurate, reliable and has also provided the same galvanically isolated devices for Today, high speed trains, control and protection signals the measurement of currents city transit systems (metro, for wayside substations. from 0.01 A to 20000 A and trams, and trolleybuses) and voltages from 10 V to 6400 V freight trains are the solutions The rail industry is under in various technologies: Open against pollution and interstate constant changes and evolution. Loop, Closed Loop, Isolating traffic immobility and provide a As a recent example, the digital technology, etc. significant energy savings. privatization of the rail networks Power electronics is essential to raised new requirements for LEM transducers for railway drive and control energy in these which LEM provides: the on- applications are designed transportation systems. board monitoring of power according to the most LEM has been a main player consumption (EM4T II Energy demanding international in traction power electronics Meter), solutions to trackside standards (EN50155, EN50124- applications and development applications, rail maintenance 1, NFF 16101, 16102, etc) and for the last 45 years and leverages and the monitoring of points carry CE marking. UL or UR this vast experience to supply (switches) machines or signaling is also available on selected solutions for isolated current conditions with some new models. and voltage measurements. transducers families. We have worldwide ISO 9000 LEM is always available to assist and ISO TS 16949 and IRIS LEM transducers provide in adapting to these evolving qualification and offer a 5-year control and protection signals to technical applications. warranty on all of our products. power converters and inverters LEM constantly innovates that regulate energy to the Four decades of railway and strives to improve the electric motors (for propulsion) 2 Content Pages performance, cost and sizes Transducer Technologies 4 - 5 of its products. On-Board Applications 6 - 15 LEM is a worldwide company Substations 16 - 19 with offices across the globe Energy Measurement for On-Board 20 - 23 and production facilities in Applications: EM4T II Europe (included Russia), Asia Specific Railway Applications 24 - 25 and America. Mining Trucks Applications 26 - 27 Trackside Applications 28 - 31 We hope you will find this LEM’s Quality & Standards 32 - 33 catalogue as a useful guide for Solutions for Voltage Measurement 34 - 35 the selection of our products. From the Application to the Product 36 - 37 Visit our website at www.lem. Secondary Connections Options 38 com and contact our sales Design Specification Form 39 - 40 network for further assistance. Product Coding 41 Detailed datasheets and Dimension Drawings 42 - 46 application notes are available. LEM’s Warranty 47 Sincerely, LEM International Sales 48 Representatives Hans-Dieter Huber Vice President Industry Sales About Products: Frank Rehfeld LTC Series 7, 9 CEO LEM LF xx10 Series 11, 14 LAC Series 11 LT 4000 Series 13-14 DVL Voltage Series 15-17-34-35 DVM Voltage Series 15-17-34-35 DV Voltage Series 15-23-34-35 HAZ Series 18-19 EM4T II 20-21-22-23 LEM - At the heart of power electronics. 3 Open Loop Current Transducers (O/L) Closed loop Fluxgate ITC type Features Features • Excellent linearity • Small package size • Low power consumption • Low residual noise • Better than Class 0.5R • Very low sensitivity to high • Extended measuring range • No insertion losses according to EN 50463 external DC and AC fields • Reduced weight • Outstanding long- • High temperature stability term stability Operation principle O/L Operation principle Test winding Compensation Isolated Output + U Fluxgate D C winding Supplies I Current S Supplies Monitoring VH r I Over Voltage Protection P OV Protection Fluxgate Oscillato VOUT Micro-Controller IP Offset Correction - UC r Transducers Technologies Transducers Bridge r _ 0 Resistor Filter DAC Power Stage LP Rectifie + PI Regulato Fluxgate D’ Synchronous Fault_PS 0V Fluxgate Current I S Primary Current I Isolated Output Voltage V P OUT R I M Primary Current P ITC current transducers are high accuracy transducers using fluxgate The magnetic flux created by the primary current I is P technology. This high sensitivity zero-flux detector uses a second wound concentrated in a magnetic circuit and measured in the air core (D’) for noise reduction. A difference between primary and secondary gap using a Hall device. The output from the Hall device is ampere turns creates an asymmetry in the fluxgate current. then signal conditioned to provide an exact representation This difference is detected by a microcontroller that controls the secondary of the primary current at the output. current that compensates the primary ampere turns (IP x NP). This results in a very good accuracy and a very low temperature drift. The secondary compensating current is an exact representation of the primary current. Closed Loop Current Transducers (C/L) Closed Loop Fluxgate (C Type) Features Features • Wide frequency range • Low temperature drift • High accuracy • Measurement of • Good overall accuracy • Excellent linearity • Very wide frequency range differential currents (CD) • Safety isolation (CV) • Fast response time • No insertion losses • Reduced temperature drift • Excellent linearity • Reduced loading on the primary (CV) Operation principle C/L Operation principle I I Isolated Output Current S S +UC -UC +U C Vout +UC Imag -UC 0V I P VH I P +UC -UC IS R I + I M S mag -UC V Isolated Output Voltage out 0V Primary Current I Primary Current I P P The magnetic flux created by the primary current IP is This technology uses two toroidal cores and two balanced by a complementary flux produced by driving secondary windings and operates on a fluxgate principle a current through the secondary windings. A hall device of Ampere-turns compensation. For the voltage type a and associated electronic circuit are used to generate small (few mA) current is taken from the voltage line to be the secondary (compensating) current that is an exact measured and is driven through the primary coil and the representation of the primary current. primary resistor. 4 DV, DVL & DVM Type Voltage transducers Closed Loop Voltage Transducers (C/L) Features Features • Insulating digital technology • Low consumption and losses • Measurement of all • Measurement of • Good overall accuracy types of signals: DC, AC, • Very high accuracy, Class pulsed and complex 0.5R according to EN high voltages • Low temperature drift 50463 (DV Models) • Compact size, reduced volume • Safety isolation • Excellent linearity • Low temperature drift • High galvanic insulation Operation principle Operation principle C/L R1 Supply Isolated Output Current I Rectifier Filter Power Supply +VC S +UC -VC +Up -Up 0V +5V VP VH +HT Bitstream Technologies Transducers Digital Micro controller U / I Primary Modulator I Filter D/A Converter Generator Output -UC S Voltage VP -HT RM R1 IP 0V -Up Primary Voltage V P The measuring voltage, VP , is applied directly to the A very small current limited by a series resistor is taken transducer primary connections through a resistor network from the voltage to be measured and is driven through allowing the signal conditioning circuitry to feed a Sigma- the primary coil. The magnetic flux created by the primary Delta modulator that allows to transmit data via one single current IP is balanced by a complementary flux produced isolated channel. by driving a current through the secondary windings. A The signal is then transmitted to the secondary over an hall device and associated electronic circuit are used to insulating transformer ensuring the insulation between generate the secondary (compensating) current that is an the high voltage side (primary) and the low voltage side exact representation of the primary voltage. The primary (secondary). resistor (R1) can be incorporated or not in the transducer. The signal is reshaped on the secondary side, then decoded and filtered through a digital filter to feed a micro- controller using a Digital/Analog (D/A) converter and a voltage to current generator. The recovered output signal is completely insulated against the primary and is an exact representation of the primary voltage. * For further information, refer the brochure “Characteristics - Applications -Calculations” or www.lem.com 5 On-Board Applications in different countries with various measurement. electrical railway catenary voltages, Multi winding transformers convert The electrical power is supplied to it
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