Power Circuit of Locomotives WAP5 and WAG9
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Questions and Answers

What is the maximum phase-to-phase voltage specified in the data?

  • 2200 V
  • 2100 V
  • 2180 V (correct)
  • 2300 V

    • What is the rated current of the traction winding?

  • 261.25 A
  • 1142 A (correct)
  • 270 A
  • 393 A

    • What type of cooling system is utilized for the transformer?

  • Forced oil cooling (correct)
  • Air cooling
  • Natural oil cooling
  • Refrigerant cooling

    • What is the guaranteed value for the traction winding inductivity?

    <p>2.1 mH</p> Signup and view all the answers

    What is the temperature rise specified for the primary winding?

    <p>11 K</p> Signup and view all the answers

    What is the maximum temperature for copper components specified?

    <p>100°C</p> Signup and view all the answers

    Which type of cooling system is used for the power converter?

    <p>Forced oil cooling</p> Signup and view all the answers

    What is the nominal DC link voltage for both the power converter and motor inverter?

    <p>2800 V</p> Signup and view all the answers

    What is the rated voltage of the motor specified?

    <p>2180 V</p> Signup and view all the answers

    How many quadrants does the specified power converter operate in?

    <p>Four</p> Signup and view all the answers

    What is the frequency range of the motor specified in the content?

    <p>0 - 160.3 Hz</p> Signup and view all the answers

    What is the value of the resistance for the traction winding?

    <p>23.7 mΩ</p> Signup and view all the answers

    What is the primary temperature rise indicated in the specifications?

    <p>11 K</p> Signup and view all the answers

    What cooling oil type is specified for the converter's cooling system?

    <p>Diala DX</p> Signup and view all the answers

    What is the specified voltage for the transformer secondary?

    <p>1269 V</p> Signup and view all the answers

    What is the role of the primary voltage transformer in the locomotive's power circuit?

    <p>To monitor the overhead catenary voltage and protect equipment</p> Signup and view all the answers

    How does the GTO thyristor control system affect traction motors during regenerative braking?

    <p>It enables the traction motors to act as induction generators by controlling frequency for negative slip value</p> Signup and view all the answers

    What distinguishes the main transformer in WAP5 locomotives from traditional transformers?

    <p>It includes multiple traction and auxiliary windings</p> Signup and view all the answers

    What function do the 4-quadrant pulse controlled converters serve in the locomotive?

    <p>They stabilize line voltage conditions independent of active power flow</p> Signup and view all the answers

    How are the traction and auxiliary windings structured within the main transformer?

    <p>There are four traction windings and a single auxiliary winding</p> Signup and view all the answers

    What is the primary purpose of the surge arrestors installed on the locomotive?

    <p>To protect the equipment from voltage spikes</p> Signup and view all the answers

    What happens to the traction motors during their discharge through the MUB resistor?

    <p>They are instantaneously discharged to manage excess energy</p> Signup and view all the answers

    In a WAG9 locomotive, how many traction motors are utilized on a bogie?

    <p>Three traction motors</p> Signup and view all the answers

    What is the design speed of the traction motor mentioned?

    <p>3571 rpm</p> Signup and view all the answers

    Which of the following components has a cooling system that uses forced oil cooling?

    <p>Transformer</p> Signup and view all the answers

    What is the rated output at the shaft for the traction motor?

    <p>1150 kW</p> Signup and view all the answers

    What is the maximum voltage of the traction motor phase to phase?

    <p>2180 V</p> Signup and view all the answers

    What type of insulation system is mentioned for the traction motor?

    <p>Class 200</p> Signup and view all the answers

    Which winding of the transformer has a rating of 1260 A?

    <p>Hotel load winding</p> Signup and view all the answers

    Which frequency value is listed for one of the traction motor phases?

    <p>160.3 Hz</p> Signup and view all the answers

    How many traction motors are employed per locomotive?

    <p>4</p> Signup and view all the answers

    What is the no-load current at 22.5 kV for the transformer?

    <p>0.5 A</p> Signup and view all the answers

    What is the torque at the shaft of the traction motor rated at 593 A?

    <p>9920 Nm</p> Signup and view all the answers

    What is the voltage rating of the instant voltage limitation device mentioned?

    <p>2800 V</p> Signup and view all the answers

    How many traction motors are installed per locomotive for the WAG9?

    <p>6</p> Signup and view all the answers

    What is the total capacity rating of the DC link capacitor bank?

    <p>11.41 mF</p> Signup and view all the answers

    Which component is part of the instant voltage limitation device?

    <p>Power Resistor</p> Signup and view all the answers

    What is the type of traction motor used in the WAG9 locomotive?

    <p>6 FRA 6068</p> Signup and view all the answers

    What make is specified for the series resonant circuit capacitor?

    <p>ERO</p> Signup and view all the answers

    What is the voltage rating of the series resonant circuit capacitors mentioned?

    <p>2940 V</p> Signup and view all the answers

    Which type of thyristors is mentioned for the traction rolling stock?

    <p>GTO Thyristors</p> Signup and view all the answers

    What is the total rating for the series of capacitors making up the adjustable capacitor unit?

    <p>840 µF</p> Signup and view all the answers

    What is the make of the power diode mentioned in the instant voltage limitation?

    <p>Eupec</p> Signup and view all the answers

    What is the combined current per phase for the traction motors if all four motors are operating at their maximum rated current of 593 A?

    <p>2372 A</p> Signup and view all the answers

    Which of the following frequencies corresponds to a traction motor in the provided data?

    <p>160.3 Hz</p> Signup and view all the answers

    What is the maximum torque (in Nm) that one of the traction motors can deliver at its rated conditions?

    <p>9920 Nm</p> Signup and view all the answers

    What is the function of the primary voltage transformer in a locomotive's power circuit?

    <p>To monitor overhead catenary voltage and protect equipment.</p> Signup and view all the answers

    At what speed does the transformer utilize forced oil cooling?

    <p>Cooling does not depend on speed</p> Signup and view all the answers

    What role do the GTO thyristors play in the traction drive system?

    <p>They manage the regenerative braking process by controlling output frequency.</p> Signup and view all the answers

    Which winding is specifically designed to reduce harmonics in the power circuit?

    <p>Harmonic filter winding</p> Signup and view all the answers

    Which insulation class is specified for the stator winding of the traction motor?

    <p>Class 200</p> Signup and view all the answers

    What is the total apparent power (kVA) rating of the primary winding of the transformer at 25 kV line voltage?

    <p>7475 kVA</p> Signup and view all the answers

    In a WAP5 locomotive, how is power distributed to the traction motors?

    <p>Through a series of line converters connected in parallel.</p> Signup and view all the answers

    What happens during regenerative braking in this locomotive's system?

    <p>The traction motors generate power and feed it back to the catenary.</p> Signup and view all the answers

    Which winding of the transformer is responsible for handling the highest current rating of 1260 A?

    <p>Hotel load winding</p> Signup and view all the answers

    What is the main purpose of the series resonant circuit within the intermediate circuit?

    <p>To smooth out the DC link voltage fluctuations.</p> Signup and view all the answers

    What is the rated output power at the shaft for the traction motors specified in the data?

    <p>1150 kW</p> Signup and view all the answers

    How does the control electronics protect the locomotive's equipment?

    <p>By tripping off the VCB in case of abnormal catenary voltages.</p> Signup and view all the answers

    What is the rated voltage for the traction winding of the transformer?

    <p>1269 V</p> Signup and view all the answers

    What distinguishes the WAP5 locomotive's transformer from conventional transformers?

    <p>It is a specially built high impedance transformer.</p> Signup and view all the answers

    What is the temperature rise specified for the hotel load winding?

    <p>13 K</p> Signup and view all the answers

    Which characteristic differentiates the 4 Quadrant power converter for traction rolling stock?

    <p>It has a nominal DC link voltage of 2800 V.</p> Signup and view all the answers

    What is the maximum temperature allowed for the cooling oil used in the power converter?

    <p>84°C</p> Signup and view all the answers

    Which type of thyristor is specified for the traction rolling stock?

    <p>GTO Thyristors</p> Signup and view all the answers

    What is the inductance value specified for the traction winding?

    <p>0.5 mH</p> Signup and view all the answers

    What is the nominal frequency for the motor inverter?

    <p>0...160.3 Hz</p> Signup and view all the answers

    What is the make of the power converter used in the traction rolling stock?

    <p>ABB, Switzerland</p> Signup and view all the answers

    For which cooling oil type is specified in the converter's cooling system?

    <p>Diala DX</p> Signup and view all the answers

    What resistance value is indicated for the hotel load winding?

    <p>11 mΩ</p> Signup and view all the answers

    How many power diodes are specified for the power converter system?

    <p>8</p> Signup and view all the answers

    What is the nominal current rating for the primary winding of the transformer?

    <p>261.25 A</p> Signup and view all the answers

    Which component of the transformer has a temperature rise specified as 17 K?

    <p>Traction winding</p> Signup and view all the answers

    What is the frequency associated with the traction motor's rated current of 393 A?

    <p>132 Hz</p> Signup and view all the answers

    What is the impedance value guaranteed for the traction winding?

    <p>3.08 %</p> Signup and view all the answers

    Which winding of the transformer has a no-load current of 0.5 A at 22.5 kV?

    <p>Primary winding</p> Signup and view all the answers

    What is the capacity rating of the DC Link Capacitor specified?

    <p>11.41 mF</p> Signup and view all the answers

    Which component is not included in the instant voltage limitation device?

    <p>Induction motor</p> Signup and view all the answers

    What is the make and type of the Series Resonant Circuit Capacitor mentioned?

    <p>ERO, ERO – GFP 3.8</p> Signup and view all the answers

    What is the voltage rating of the Series Resonant Circuit Capacitor?

    <p>2940 V</p> Signup and view all the answers

    Which type of motor is specified for the traction system in WAG9 locomotives?

    <p>3-phase Induction Motor</p> Signup and view all the answers

    What is the current rating of the instant voltage limitation device?

    <p>500 A</p> Signup and view all the answers

    What is the make of the power diode used in the instant voltage limitation?

    <p>Eupec</p> Signup and view all the answers

    How many series resonant circuit capacitors are present in the adjustable capacitor unit?

    <p>3</p> Signup and view all the answers

    What is the total mF for the capacitors in the bank of the DC Link Capacitor?

    <p>11.41 mF</p> Signup and view all the answers

    What is the type of thyristor mentioned for traction rolling stock?

    <p>GTO Thyristor</p> Signup and view all the answers

    Study Notes

    Power Circuit Description

    • Locomotives WAP5 and WAG9 use a 3-phase drive with GTO thyristors and microprocessor control.
    • The primary winding is fed from overhead equipment (25 kV, single-phase AC, 50 Hz) through a pantograph and vacuum circuit breaker.
    • Surge arrestors are on the roof to protect the equipment.
    • A primary voltage transformer monitors overhead catenary voltage, crucial for protecting the equipment by tripping the VCB if voltage is outside limits.
    • The main transformer is a high-impedance design for traction.
    • It has four traction windings, a hotel load winding (in WAP5), and a harmonic filter winding.
    • Two traction windings feed two 4-quadrant line converters in parallel.
    • The line converters feed a DC link.
    • The DC link consists of a series resonant circuit and capacitors.
    • The drive converter feeds the traction motors.
    • WAP5 has two motors per bogie, WAG9 has three per bogie.
    • During regenerative braking, traction motors are used as induction generators to return energy to the catenary.
    • This is accomplished by controlling slip to a negative value
    • A 4-quadrant pulse controlled converter stabilizes the voltage during braking.

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    Description

    This quiz explores the power circuit design of locomotives WAP5 and WAG9, focusing on their 3-phase drive systems, control mechanisms, and voltage monitoring. It covers critical components such as the pantograph, transformers, and braking systems. Test your understanding of the engineering principles behind these advanced locomotives.

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