Auxiliary Circuits in WAP5 and WAG9 Locomotives
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Questions and Answers

What is the main purpose of the machine room blowers in the auxiliary circuit?

  • To provide ventilation to the locomotive's exterior.
  • To operate the auxiliary motors in the locomotive.
  • To cool electronic cubicles and pressurize the machine room. (correct)
  • To increase the voltage of the main transformer.

    • What voltage does the auxiliary transformer output to the single phase circuit?

  • 1000V AC
  • 50V DC
  • 230V AC only
  • 415V AC and 110V AC (correct)

    • Which component of the auxiliary circuit is responsible for providing a cooling function during high temperatures?

  • The machine room blowers (correct)
  • The cab heaters
  • The 3-phase static auxiliary converter
  • The auxiliary transformer

    • How does the 3-phase auxiliary converter differ from the Arno Converter?

    <p>It is more maintenance-free with fewer moving parts.</p> Signup and view all the answers

    What occurs if the machine room temperature exceeds 70°C?

    <p>The machine room blower will activate to lower the temperature.</p> Signup and view all the answers

    What is the typical operating voltage of the auxiliary winding from the main transformer?

    <p>1000V</p> Signup and view all the answers

    What type of loads are connected to the 110V AC circuit in the single phase auxiliary circuit?

    <p>Blowers for cab heater and cab fans</p> Signup and view all the answers

    What advantage does the load distribution among the Bur's provide in the auxiliary circuit?

    <p>Automatic load switching to provide redundancy.</p> Signup and view all the answers

    What type of motors does the 3-phase auxiliary circuit provide power for?

    <p>3-phase auxiliary motors</p> Signup and view all the answers

    What is one of the primary functions of the cab heaters in the auxiliary circuit?

    <p>To ensure passenger comfort during travel.</p> Signup and view all the answers

    What is the maximum frequency limit for ventilation when BUR1 fails?

    <p>42Hz</p> Signup and view all the answers

    Which component is fed by BUR3 at a fixed frequency of 50Hz?

    <p>Battery charger</p> Signup and view all the answers

    How does the speed of the traction motor blowers vary?

    <p>It varies in three steps: 17Hz, 33Hz, and 50Hz.</p> Signup and view all the answers

    What happens to BUR3's output voltage and frequency when a compressor starts?

    <p>They are reduced to near zero before ramping up.</p> Signup and view all the answers

    What occurs if both BUR1 and BUR2 fail?

    <p>Ventilation is managed by BUR3 at 42Hz.</p> Signup and view all the answers

    Which contactors are closed when BUR1 is isolated?

    <p>Contactors 52/4, 52/1, 52/3, and 52.1/2</p> Signup and view all the answers

    What type of supply does BUR1&2 provide to the traction motor blowers?

    <p>Variable voltage and variable frequency supply</p> Signup and view all the answers

    What auxiliary function does BUR3 perform related to battery management?

    <p>It also supplies to battery chargers.</p> Signup and view all the answers

    What mechanism aids in load changeover between auxiliary converters during isolation?

    <p>Electro-pneumatic contactors</p> Signup and view all the answers

    What is the general operating frequency of BUR3?

    <p>50Hz</p> Signup and view all the answers

    What is the primary distinction between the single phase and 3-phase auxiliary circuits in the locomotives?

    <p>They have distinctly separated circuits despite being fed from the same auxiliary winding.</p> Signup and view all the answers

    How does the static auxiliary converter's operation differ fundamentally from that of a conventional Arno Converter?

    <p>It does not use rotating parts, leading to less wear and tear.</p> Signup and view all the answers

    What function do the scavenge blowers serve in the auxiliary circuit of the locomotives?

    <p>They assist in cooling electronic components within the machine room.</p> Signup and view all the answers

    In the case of a failure of any auxiliary converter, what ensures required redundancy within the auxiliary circuit?

    <p>The automatic load switching from one auxiliary converter to another.</p> Signup and view all the answers

    What operational strategy is implemented to prevent the machine room temperature from exceeding 70°C during peak summer?

    <p>The control circuit enters a 'cooling mode' allowing specific functions to operate without intervention.</p> Signup and view all the answers

    What role do the machine room blowers play during the locomotive's operation?

    <p>They prevent the overheating of electronic components by ensuring proper ventilation.</p> Signup and view all the answers

    What is the purpose of the 415V AC circuit within the single phase auxiliary circuit?

    <p>To supply energy to machine room blowers, scavenge blowers, and cab heaters.</p> Signup and view all the answers

    When does the machine room blower activate to lower the temperature in emergency situations?

    <p>When the control electronics indicate an over-temperature condition.</p> Signup and view all the answers

    What type of loads are primarily serviced by the 110V AC circuit in the single phase auxiliary circuit?

    <p>Heating elements and fans for cab trailers.</p> Signup and view all the answers

    How are the auxiliary circuits energized in the WAP5 and WAG9 locomotives?

    <p>Immediately after the circuit breaker is closed.</p> Signup and view all the answers

    What is the primary role of BUR3 in the auxiliary circuit?

    <p>To provide a fixed frequency supply to compressor motors and oil pumps</p> Signup and view all the answers

    What occurs to BUR3's voltage and frequency during the start of a compressor?

    <p>They drop to near zero and then ramp up for a soft start</p> Signup and view all the answers

    What limitation is placed on BUR1 and BUR2 when one of them fails?

    <p>They can only supply power to ventilation auxiliaries at 42Hz</p> Signup and view all the answers

    How does the auxiliary converter electronics respond during isolation of one converter?

    <p>It automatically switches the load to another auxiliary converter</p> Signup and view all the answers

    Which contactors remain closed when BUR2 is isolated?

    <p>52/5, 52/4, 52/3, 52.1/2</p> Signup and view all the answers

    What is the maximum frequency BUR2 can provide for ventilation when BUR1 fails?

    <p>42Hz</p> Signup and view all the answers

    What is the effect on BUR3 if it gets isolated?

    <p>BUR2 takes over feeding compressor motors at 50Hz</p> Signup and view all the answers

    What are the operating frequencies for the traction motor blowers controlled by BUR1 and BUR2?

    <p>17Hz, 33Hz, 50Hz</p> Signup and view all the answers

    What happens to the output voltage of BUR3 during normal operation?

    <p>It remains stable at 415V with slight variations</p> Signup and view all the answers

    What connections are made when BUR1 is isolated?

    <p>52/4, 52/1, 52/3, 52.1/2 are closed</p> Signup and view all the answers

    What is the maximum frequency BUR1 can provide for ventilation if BUR2 fails?

    <p>42Hz</p> Signup and view all the answers

    Which components does BUR3 feed with a fixed frequency supply?

    <p>Compressor motors</p> Signup and view all the answers

    What happens to BUR3's output voltage and frequency upon starting a compressor?

    <p>It drops to near zero.</p> Signup and view all the answers

    How does load changeover between auxiliary converters occur?

    <p>Automatically by the auxiliary converter electronics.</p> Signup and view all the answers

    What is the speed control mechanism for the traction motor blowers?

    <p>Three-step control based on temperature.</p> Signup and view all the answers

    What happens if BUR3 fails?

    <p>BUR2 feeds compressor motor and oil pumps at 50Hz.</p> Signup and view all the answers

    How is the speed of the traction motor blowers adjusted?

    <p>By control electronics based on temperature.</p> Signup and view all the answers

    What is the operating frequency of BUR3?

    <p>50Hz</p> Signup and view all the answers

    What is the role of contactors within the system during isolation events?

    <p>To facilitate automatic load changeover.</p> Signup and view all the answers

    Under normal operation, which contactors are closed?

    <p>52/1, 52/3, 52.½, 52/5</p> Signup and view all the answers

    What primary function do the machine room blowers serve?

    <p>To cool electronic cubicles and pressurize the machine room</p> Signup and view all the answers

    What is the maximum voltage output of the auxiliary transformer to the single phase circuit?

    <p>415V</p> Signup and view all the answers

    At what temperature must the machine room be maintained to ensure proper operation of control electronics?

    <p>70°C</p> Signup and view all the answers

    Which of the following is NOT a load connected to the 415V AC circuit?

    <p>Cab fans</p> Signup and view all the answers

    What characteristic sets the static auxiliary converter apart from the Arno Converter?

    <p>It is almost maintenance free due to no rotating parts</p> Signup and view all the answers

    How is redundancy achieved in the load distribution among the auxiliary converters?

    <p>By automatically switching load from one converter to another</p> Signup and view all the answers

    What voltage does the auxiliary transformer provide to the 110V AC circuit?

    <p>110V</p> Signup and view all the answers

    What is the primary benefit of the auxiliary circuit being distinctly separated for single phase and 3-phase machines?

    <p>Improved safety and operational reliability</p> Signup and view all the answers

    Which component in the auxiliary circuit is responsible for regulating the voltage output to auxiliary machines?

    <p>Static auxiliary converter</p> Signup and view all the answers

    What happens when the machine room blower is activated in high-temperature situations?

    <p>It aids in lowering the machine room temperature</p> Signup and view all the answers

    What is the maximum frequency that BUR1 or BUR2 can supply for ventilation when one of them fails?

    <p>42Hz</p> Signup and view all the answers

    What operational behavior occurs when a compressor is started with respect to BUR3?

    <p>Output voltage and frequency are reduced to near zero before ramping up.</p> Signup and view all the answers

    What is the primary function of the auxiliary transformer in the single phase circuit?

    <p>To convert 1000V AC to 415V and 110V AC</p> Signup and view all the answers

    In normal operation, which contactors are open?

    <p>52/2, 52/4, 52.1/1</p> Signup and view all the answers

    How is load changeover between auxiliary converters facilitated during isolation?

    <p>Automatically with the aid of electro-pneumatic contactors.</p> Signup and view all the answers

    Which of the following loads operate at 110V AC in the single phase auxiliary circuit?

    <p>Cab fans</p> Signup and view all the answers

    What action does the control circuit take when the machine room temperature exceeds 70°C?

    <p>It activates the machine room blowers in cooling mode</p> Signup and view all the answers

    What role does BUR3 play in feeding auxiliary components?

    <p>Supplies a fixed frequency to several critical components.</p> Signup and view all the answers

    What change happens to BUR2 and BUR1 when BUR3 fails?

    <p>BUR2 feeds compressor motor and oil pumps at a fixed frequency.</p> Signup and view all the answers

    What distinguishes the static auxiliary converter from conventional auxiliary converters?

    <p>It is less prone to mechanical wear and maintenance</p> Signup and view all the answers

    When do the 415V and 110V AC auxiliary circuits get energized?

    <p>As soon as the VCB is closed</p> Signup and view all the answers

    What action is taken by the control electronics for traction motor blowers based on temperature sensing?

    <p>They operate at one of three set frequencies.</p> Signup and view all the answers

    What aspect of BUR3's output voltage is influenced by the battery charging requirement?

    <p>It varies slightly around 415V.</p> Signup and view all the answers

    What is the main advantage of the load distribution among the BURs in the auxiliary circuit?

    <p>It allows for automatic load switching in case of converter failure</p> Signup and view all the answers

    What function do the scavenge blowers serve in the auxiliary circuit?

    <p>They assist the machine room blowers for effective cooling</p> Signup and view all the answers

    Which characteristic of the auxiliary converter electronics impacts maintenance efficiency?

    <p>Lack of moving components leading to low wear</p> Signup and view all the answers

    Study Notes

    Auxiliary Circuit Description

    • Auxiliary circuits in WAP5 and WAG9 locomotives use single-phase and three-phase motors. Circuits are separate but powered by the same auxiliary winding (1000V) of the main transformer.

    Single-Phase Circuit

    • Figure 5.1 shows the single-phase auxiliary circuit.
    • An auxiliary transformer steps down the auxiliary winding voltage to 415V and 110V AC.
    • The 415V AC circuit powers machine room blowers, scavenge blowers for machine room blowers, and cab heaters.
    • The 110V AC circuit powers cab fans and blowers for cab heaters.
    • Auxiliary circuits energize when the VCB is closed.
    • Machine room blowers cool electronic components and pressurize the machine room.
    • A target temperature of 70°C in the machine room is maintained.
    • If the temperature exceeds 70°C, a "cooling mode" operation is activated, allowing pantograph raising and VCB closure to bring the temperature back down. This happens automatically without operator intervention.

    Three-Phase Circuit

    • Figure 5.2 shows the three-phase auxiliary circuit.
    • WAP5 and WAG9 locomotives use static auxiliary converters.
    • These converters power three-phase auxiliary motors.
    • Static converters lack rotating components, leading to lower maintenance compared to Arno converters.

    Circuit Description

    • Load distribution among the converters ensures redundancy.
    • If one converter fails, the load automatically shifts to another.
    • This automatic switching occurs to maintain operation needed for the locomotive.

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    Description

    This quiz focuses on the auxiliary circuits used in WAP5 and WAG9 locomotives, detailing both the single-phase and three-phase systems. It covers the functioning of these circuits, including the voltage step-down and temperature maintenance for optimal performance. Test your knowledge on locomotive auxiliary systems and their components.

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