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Questions and Answers
What is the nominal input voltage of the traction converter cubicle?
What is the nominal input voltage of the traction converter cubicle?
2 x 950 V AC, 50 Hz / 1500V DC
What is the input voltage range in AC mode for the traction converter cubicle?
What is the input voltage range in AC mode for the traction converter cubicle?
627 V-1083 V AC
What is the input frequency range in AC mode for the traction converter cubicle?
What is the input frequency range in AC mode for the traction converter cubicle?
46Hz - 54 Hz
What is the nominal DC link circuit voltage for traction operation?
What is the nominal DC link circuit voltage for traction operation?
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What is the power factor in AC at different loads and line voltages for the traction converter cubicle?
What is the power factor in AC at different loads and line voltages for the traction converter cubicle?
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The traction converter cubicle is a completely assembled unit installed in the high voltage compartment of the motor coach.
The traction converter cubicle is a completely assembled unit installed in the high voltage compartment of the motor coach.
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The traction control unit (TCU) is situated outside the traction converter cubicle.
The traction control unit (TCU) is situated outside the traction converter cubicle.
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What is the function of the two four-quadrant choppers in the traction converter?
What is the function of the two four-quadrant choppers in the traction converter?
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What other components are included with the traction converter besides the four-quadrant choppers and DC link?
What other components are included with the traction converter besides the four-quadrant choppers and DC link?
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What controls and monitors the functions of the traction converter?
What controls and monitors the functions of the traction converter?
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Which of the following components are essential for the pre-charging of the DC link capacitor?
Which of the following components are essential for the pre-charging of the DC link capacitor?
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What is the primary function of the four-quadrant chopper module?
What is the primary function of the four-quadrant chopper module?
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The term "4QC" signifies that the phase angle between voltage and current is fixed.
The term "4QC" signifies that the phase angle between voltage and current is fixed.
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What type of switch is used in the four-quadrant chopper module?
What type of switch is used in the four-quadrant chopper module?
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What is the pulse frequency of the four-quadrant chopper module?
What is the pulse frequency of the four-quadrant chopper module?
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What is the maximum possible amplitude of the phase to phase output voltage of the PWM inverter?
What is the maximum possible amplitude of the phase to phase output voltage of the PWM inverter?
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The PWM inverter's output frequency is the same as the basic fundamental frequency.
The PWM inverter's output frequency is the same as the basic fundamental frequency.
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What is the function of the protection resistors connected to the brake chopper?
What is the function of the protection resistors connected to the brake chopper?
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What is the primary purpose of the brake chopper in the traction converter?
What is the primary purpose of the brake chopper in the traction converter?
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What type of semiconductor is used in the PWM inverter and brake chopper?
What type of semiconductor is used in the PWM inverter and brake chopper?
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What is the pulse frequency range of the PWM inverter?
What is the pulse frequency range of the PWM inverter?
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What is the capacity of the DC link circuit?
What is the capacity of the DC link circuit?
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What is the inductance of the line reactor?
What is the inductance of the line reactor?
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What is the control voltage range for the brake chopper?
What is the control voltage range for the brake chopper?
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What is the maximum operating current for the brake chopper at nominal voltage?
What is the maximum operating current for the brake chopper at nominal voltage?
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What is the auxiliary supply voltage for the brake chopper?
What is the auxiliary supply voltage for the brake chopper?
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What is the continuous power demand of the brake chopper?
What is the continuous power demand of the brake chopper?
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What is the continuous rating of the input power per 4QC?
What is the continuous rating of the input power per 4QC?
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What is the short time rating (2 min) of the input power per 4QC?
What is the short time rating (2 min) of the input power per 4QC?
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What is the continuous rating of the input current per 4QC?
What is the continuous rating of the input current per 4QC?
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What is the short time rating (2 min) of the input current per 4QC?
What is the short time rating (2 min) of the input current per 4QC?
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What is the continuous rating of the output power per PWMI in AC and DC?
What is the continuous rating of the output power per PWMI in AC and DC?
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What is the short time rating (2 min) of the output power per PWMI in AC and DC?
What is the short time rating (2 min) of the output power per PWMI in AC and DC?
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What is the continuous rating of the output current per PWMI in AC?
What is the continuous rating of the output current per PWMI in AC?
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What is the short time rating (2 min) of the output current per PWMI in AC?
What is the short time rating (2 min) of the output current per PWMI in AC?
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What is the output voltage (L-L) in AC?
What is the output voltage (L-L) in AC?
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What is the airflow required for the traction converter cabinet?
What is the airflow required for the traction converter cabinet?
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The traction converter cabinet uses a natural convection cooling system.
The traction converter cabinet uses a natural convection cooling system.
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Where is the IGBT module installed in the traction converter cabinet?
Where is the IGBT module installed in the traction converter cabinet?
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Where is the PWM inverter IGBT module installed in the traction converter cabinet?
Where is the PWM inverter IGBT module installed in the traction converter cabinet?
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Where is the DC main-line contactor installed in the cabinet?
Where is the DC main-line contactor installed in the cabinet?
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Where is the DC/line contactor installed in the cabinet?
Where is the DC/line contactor installed in the cabinet?
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Where is the DC pre-charging contactor installed in the cabinet?
Where is the DC pre-charging contactor installed in the cabinet?
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Where are the main blowers installed in the cabinet?
Where are the main blowers installed in the cabinet?
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Where are the auxiliary blowers installed in the cabinet?
Where are the auxiliary blowers installed in the cabinet?
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Where are the DC Link capacitors installed in the cabinet?
Where are the DC Link capacitors installed in the cabinet?
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Where is the IGBT driver card power supply installed in the cabinet?
Where is the IGBT driver card power supply installed in the cabinet?
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Where are the current transducers installed in the cabinet?
Where are the current transducers installed in the cabinet?
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Where are the voltage transducers installed in the cabinet?
Where are the voltage transducers installed in the cabinet?
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Where is the intermediate transformer current installed in the cabinet?
Where is the intermediate transformer current installed in the cabinet?
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Where is the SIBAS filter installed in the cabinet?
Where is the SIBAS filter installed in the cabinet?
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Where is the temperature sensor for the air inlet installed in the cabinet?
Where is the temperature sensor for the air inlet installed in the cabinet?
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Where are the pre-charging resistors installed in the cabinet?
Where are the pre-charging resistors installed in the cabinet?
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Where is the discharge resistor DC link installed in the cabinet?
Where is the discharge resistor DC link installed in the cabinet?
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Where is the grounding capacitor installed in the cabinet?
Where is the grounding capacitor installed in the cabinet?
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Where are the contactors for the blower circuit installed in the cabinet?
Where are the contactors for the blower circuit installed in the cabinet?
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Where are the auxiliary contactors installed in the cabinet?
Where are the auxiliary contactors installed in the cabinet?
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Where is the SIBAS 32 S traction control unit installed in the cabinet?
Where is the SIBAS 32 S traction control unit installed in the cabinet?
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Where is the EMC capacitor installed in the cabinet?
Where is the EMC capacitor installed in the cabinet?
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Where is the intermediate transformer voltage installed in the cabinet?
Where is the intermediate transformer voltage installed in the cabinet?
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Study Notes
Traction Converter Cubicle
- The traction converter cubicle is a complete unit located in the motor coach's high-tension compartment.
- The traction control unit (TCU) is housed inside the cubicle.
- Nominal Input Voltage: 2 x 950 V AC, 50 Hz / 1500V DC
- AC Input Voltage Range: 627 V - 1083 V AC (related to line voltage 16.5-28.5 kV)
- AC Input Frequency Range: 46 Hz - 54 Hz
- DC Input Voltage Range: 800 V - 1800 V DC
- Nominal DC Link Circuit Voltage: AC Mode 1800 V, DC Mode 1500 V
- Power Factor (AC): Approximately unity at different loads and line voltages
Electrical System
- The traction converter uses a dual voltage system: 1500V DC or 950V, single-phase, 50Hz AC (25kV AC line).
- It has two four-quadrant choppers, a DC link, and two PWM inverters that supply two traction motors.
- Components: DC link capacitors, contactors, transducers, blowers, and a Siemens Traction control unit (TCU) SIBAS® 32S are included.
Functional Sections in AC Mode
- Input and Pre-Charging: A double pole contactor isolates the transformer from the traction winding and a pre-charging unit is parallel. A single pole pre-charging contactor and a resistor, R31 (with R31.1 and R31.2 in parallel), are part of the pre-charging unit. The DC link capacitor is first pre-charged before the main contactor is closed to prevent high inrush current
- Four-Quadrant Chopper Module (4QC): Transforms the input AC voltage into a controlled DC voltage for the DC link circuit. The 4QC permits for adjustable phase angle between voltage and current, enabling both driving and braking operations.
- Pulse Width Modulated Inverter: The IGBTs are used as switches and adjust the output waveform frequency to the required frequency. The IGBT switches are used alternately to put equal stress on them.
Power Rating
- Input Power per 4QC: 620 kW (continuous rating), 720 kW (short-time rating, 2 minutes)
- Input Current per 4QC: 764 A (continuous rating), 903 kW (short-time rating, 2 minutes)
- Output Power per PWMI(AC and DC): 535 kW (continuous rating) and 630 kW (short-time rating, 2 minutes)
- Output Voltage(L-L): 1217 V (AC), 986 V (DC) for output voltage.
- Capacity of DC link circuit: 12 mF (0%+10%, 4 x 3 mF)
- Air Flow Required: 1.9 m³/s (1.6 m³/s per blower)
Components List
- A comprehensive list of components and their specifications is provided (Type Number, Description, Functional Unit, Designation in cabinet, Quantity per TCC, Part no). This includes IGBT Modules, Line Contactors, Pre-charging Contactors, Main Blowers, Auxiliary Blowers, DC Link Capacitors, Current Transducers, Voltage Transducers, intermediate transformers, and more.
Photographs of Major Components
- Photographs depict various components like the TCU with control connectors, IGBT modules, PWM inverters, and four-quadrant chopper modules,
- Additional images show the position and assembly of connectors, contactors, blowers, auxiliary components and pre-charging resistor plates .
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Description
This quiz covers the essential components and specifications of the traction converter cubicle used in motor coaches. It includes information on input voltage, AC/DC operations, and the role of the traction control unit. Test your understanding of this critical electrical system.
