Traction Converter Cubicle Overview
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Questions and Answers

What is the continuous power demand of the auxiliary supply voltage?

  • 6.2 kW (correct)
  • 3.5 kW
  • 10 kW
  • 8.5 kW

    • What is the short time output current rating for AC according to the power rating?

  • 322 A
  • 903 A
  • 371 A (correct)
  • 764 A

    • What is the output voltage for DC under short time rating?

  • 800 V
  • 1024 V (correct)
  • 986 V
  • 1217 V

    • What is the required airflow for the forced ventilation system?

    <p>1.6 m3/s</p> Signup and view all the answers

    What is the value of the inductance of the line reactor?

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

    What is the nominal input voltage for the traction converter cubicle?

    <p>2 x 950 V AC, 50 Hz / 1500 V DC</p> Signup and view all the answers

    What is the approximate input frequency range for the traction converter in AC mode?

    <p>46Hz – 54 Hz</p> Signup and view all the answers

    Which component of the traction converter controls and monitors its functions?

    <p>Siemens’ Traction control unit (TCU) SIBAS® 32S</p> Signup and view all the answers

    What is the operating power factor in AC mode at different loads?

    <p>Approximately unity</p> Signup and view all the answers

    In DC mode operation, what is the nominal DC link circuit voltage?

    <p>1800 V</p> Signup and view all the answers

    What type of chopper is included in the converter system?

    <p>Two four-quadrant chopper</p> Signup and view all the answers

    What is the range of the input voltage in DC mode for the traction converter?

    <p>800 V – 1800 V DC</p> Signup and view all the answers

    What is the primary function of the IGBT in the described system?

    <p>To act as a switch with high frequency</p> Signup and view all the answers

    What happens to the current when the IGBT is blocked after reaching the desired value?

    <p>Current flows through the freewheeling diode</p> Signup and view all the answers

    Which of the following describes the result of clocking in a PWM inverter?

    <p>It reduces the output voltage RMS value</p> Signup and view all the answers

    How many IGBTs are used per Traction Converter in the system?

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

    What must occur for the IGBT to be triggered during the rectifier operation?

    <p>A current must be established in the self-inductance</p> Signup and view all the answers

    What does a significant phase shift between voltage and current indicate during braking?

    <p>The motor torque direction opposes rotation</p> Signup and view all the answers

    Which of the following components is described as a semiconductor in the text?

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

    What is primarily affected by the magnitude of the DC link voltage in the PWM inverter?

    <p>The maximum amplitude of the phase-to-phase output voltage</p> Signup and view all the answers

    What characterizes the switching sequences of the IGBT in the inverter operation?

    <p>They are selected to produce a sinusoidal current</p> Signup and view all the answers

    What frequency is specified for the pulse frequency of the inverter?

    <p>750 Hz</p> Signup and view all the answers

    What is the number of Pulse Width Modulated Inverters (PWMI) per Traction Control Car (TCC)?

    <p>2</p> Signup and view all the answers

    Which semiconductor is used in the Pulse Width Modulated Inverter?

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

    What is the maximum pulse frequency of the Pulse Width Modulated Inverter?

    <p>800Hz</p> Signup and view all the answers

    What type of braking protection does the brake chopper utilize?

    <p>Protection resistors</p> Signup and view all the answers

    How many brake choppers are specified per Pulse Width Modulated Inverter?

    <p>2</p> Signup and view all the answers

    What is the capacity of the DC link circuit?

    <p>12 mF -0 % +10 %</p> Signup and view all the answers

    What is the inductance of the line reactor?

    <p>6 mH -0 % to +10 %</p> Signup and view all the answers

    What is the control voltage range for the system?

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

    What is the maximum operating current at nominal voltage in the system?

    <p>10 Amps</p> Signup and view all the answers

    Which type of IGBT module is used in the phase module?

    <p>SIBAC® BB S P 1500 FL</p> Signup and view all the answers

    What is the role of the pre-charging resistor in the traction converter's input section during AC mode operation?

    <p>To prevent high inrush current when the converter is activated</p> Signup and view all the answers

    Which component allows for a freely adjustable phase angle between voltage and current in the traction converter?

    <p>Four-quadrant chopper</p> Signup and view all the answers

    What happens when the DC link voltage has reached 90% of its theoretical final charge?

    <p>The main contactor is switched on</p> Signup and view all the answers

    Which of the following is NOT a functional section of the traction converter in AC mode?

    <p>Heat management system</p> Signup and view all the answers

    What type of voltage does the four-quadrant chopper output to the DC link circuit?

    <p>Controlled direct voltage</p> Signup and view all the answers

    Which component isolates the transformer from the traction winding in the input section?

    <p>Double pole contactor</p> Signup and view all the answers

    In which operational mode does the traction converter use capacitive earth-fault registration?

    <p>AC mode only</p> Signup and view all the answers

    What is the purpose of the pre-charging unit in conjunction with the main contactor?

    <p>To ensure safe charging of the DC link capacitor</p> Signup and view all the answers

    What occurs during the operation of the traction converter's four-quadrant chopper?

    <p>Allows for both driving and regenerative braking</p> Signup and view all the answers

    What is the maximum allowable input voltage range for the traction converter in AC mode?

    <p>1083 V AC</p> Signup and view all the answers

    Which component is responsible for the dual voltage operation of the traction converter?

    <p>Four-quadrant choppers</p> Signup and view all the answers

    Which of the following descriptions correctly defines the role of DC link capacitors in the traction converter?

    <p>Store and stabilize DC voltage</p> Signup and view all the answers

    What is the nominal DC link circuit voltage when operating in AC mode?

    <p>1800 V</p> Signup and view all the answers

    Which operational frequency range is specified for AC mode input to the traction converter?

    <p>46Hz – 54Hz</p> Signup and view all the answers

    What is the primary function of the Siemens’ Traction Control Unit (TCU) SIBAS® 32S in the traction converter?

    <p>Control and monitoring of traction functions</p> Signup and view all the answers

    How does the traction converter achieve operation with a power factor close to unity?

    <p>Through the use of PWM inverters</p> Signup and view all the answers

    What primarily happens to the IGBT's when they are triggered during rectifier operation?

    <p>They alternate to manage thermal burdens evenly.</p> Signup and view all the answers

    What defines the maximum possible amplitude of the phase-to-phase output voltage in the system?

    <p>The magnitude of the DC link voltage.</p> Signup and view all the answers

    During the braking process, what effect does the opposing motor torque have on voltage and current?

    <p>It introduces notable phase shifting between voltage and current.</p> Signup and view all the answers

    What is the role of the freewheeling diode in the DC link circuit after the IGBT is blocked?

    <p>It redirects the current into the DC link to maintain continuity.</p> Signup and view all the answers

    How does the pulse frequency of 750 Hz affect the operation of the IGBT's in the system?

    <p>It allows for faster switching and smoother output waveform.</p> Signup and view all the answers

    What operational element is controlled by the PWM inverter to shape the output waveform?

    <p>The clocking operations performed during modulation.</p> Signup and view all the answers

    What happens during the brief turn-off operations within a fundamental in PWM modulation?

    <p>It effectively reduces the RMS value of the output voltage.</p> Signup and view all the answers

    Which characteristic of the IGBT's ensures that sinusoidal current is obtained in the output terminals?

    <p>Their capability to perform rapid on-off switching.</p> Signup and view all the answers

    What is the operational significance of the DC link voltage exceeding the nominal value during operation?

    <p>It allows for regenerative braking and energy recovery.</p> Signup and view all the answers

    In what scenario is the IGBT briefly turned off during PWM operation?

    <p>To control the amplitude of the output voltage better.</p> Signup and view all the answers

    What is the primary purpose of the protection resistors connected to the brake chopper?

    <p>To discharge the DC link for over voltage protection</p> Signup and view all the answers

    Which property characterizes the pulse frequency of the brake chopper?

    <p>Constantly maintains at 250Hz</p> Signup and view all the answers

    What is the capacity range of the DC link circuit as specified in the manual?

    <p>12 mF -0 % to +10 %</p> Signup and view all the answers

    Which of the following best describes the inductance of the line reactor?

    <p>6 mH with a tolerance of -0 % to +10 %</p> Signup and view all the answers

    What is the function of the IGBT modules in the system?

    <p>To enable high-frequency switching in the inverter</p> Signup and view all the answers

    At what control voltage range does the system operate effectively?

    <p>110 V DC to 137.5 V DC</p> Signup and view all the answers

    How many Pulse Width Modulated Inverters (PWMI) are provided per Traction Control Car (TCC)?

    <p>2</p> Signup and view all the answers

    What happens to all IGBT modules when a serious fault is detected by SIBAS?

    <p>They are all turned off and the chopper is activated</p> Signup and view all the answers

    Which type of phase module is identified in the system?

    <p>SIBAC BB S P 1500 FL</p> Signup and view all the answers

    What is the initial step taken when the converter is put into operation in AC mode?

    <p>The DC link capacitor is pre-charged.</p> Signup and view all the answers

    Which component of the traction converter is responsible for converting single phase AC into a controlled direct voltage?

    <p>Four-quadrant chopper</p> Signup and view all the answers

    What role does the pre-charging resistor play in the traction converter during AC mode operation?

    <p>It prevents high inrush current by controlling the charge rate.</p> Signup and view all the answers

    During AC mode operation, what must be achieved before closing the main contactor?

    <p>The DC link voltage must reach 90% of its theoretical final charge.</p> Signup and view all the answers

    Which operational characteristic does the term 'four-quadrant' in a four-quadrant chopper refer to?

    <p>The phase angle management during driving and braking.</p> Signup and view all the answers

    What is the purpose of the capacitive earth-fault registration in the traction converter?

    <p>To detect and register any earth faults in the system.</p> Signup and view all the answers

    How does the pre-charging unit protect the converter during operation?

    <p>It prevents sudden inrush currents upon activation.</p> Signup and view all the answers

    What occurs when the main contactor is switched on in the traction converter's AC mode operation?

    <p>Current can flow through the inverter to the DC link.</p> Signup and view all the answers

    What is the significance of the phase angle controllability in the four-quadrant chopper?

    <p>It allows for flexible operation in multiple operating quadrants.</p> Signup and view all the answers

    Study Notes

    Traction Converter Cubicle

    • The traction converter cubicle is a complete unit in the motor coach's high-tension compartment.
    • The traction control unit (TCU) is inside the cubicle.
    • Nominal input voltage: 2 x 950 V AC, 50 Hz / 1500 V DC
    • Input voltage range (AC): 627 V - 1083 V AC, related to line voltage 16.5-28.5 kV
    • Input frequency range (AC): 46 Hz - 54 Hz
    • Input voltage range (DC): 800 V - 1800 V DC
    • Nominal DC link circuit voltage: AC Mode 1800 V, DC Mode 1500 V
    • Power factor in AC at different loads and line voltages: Approximately unity

    Electrical System

    • The traction converter operates on a dual voltage system (1500 V DC or 950 V, 1-phase, 50 Hz AC).
    • The converter uses two four-quadrant choppers, a DC link, and two PWM inverters to power two traction motors.
    • Other components include DC link capacitors, contactors, transducers, blowers, and resistors.
    • The Siemens Traction control unit (TCU) SIBAS® 32S controls and monitors the converter.

    Functional Sections (AC Mode)

    • Input and pre-charging: Main contactor (K1) isolates the transformer and 4QC module from traction windings. Pre-charging unit (K4) with resistor (R31.1 and R31.2 in parallel) connects in parallel for pre-charging the link capacitors. This prevents high inrush current. The main contactor closes when DC link voltage reaches 90% of final charge.
    • Four-quadrant chopper (4QC): This transforms the AC input voltage to a controlled DC voltage for the DC link. It handles both driving and braking operations, with freely adjustable phase angle between voltage and current
    • Capacitive earth-fault registration: Ensures protection of the system.
    • DC link circuit: Connects the choppers and inverters. This circuit includes capacitors (C1, C2, C3, C4).
    • Pulse width modulated inverter & braking chopper: Used for regulating the output voltage to meet the needs of both driving and braking operations.

    Component List

    • A list of all major components (type number, description, functional unit, designation in cabinet, quantity per TCC, and part number) is included in the document. Many component types include IGBTs, contactors, blowers, capacitors, transducers, and others. Also detailed are the type of modules and their functions.

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    Description

    This quiz covers the essential concepts and components of the traction converter cubicle used in motor coaches. It delves into voltage specifications, operational parameters, and the role of the Siemens Traction Control Unit (TCU). Test your understanding of these electrical systems and their functionality.

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