Traction Converter Cubicle Overview
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Questions and Answers

What is the nominal DC link circuit voltage for traction operation?

  • 25KV
  • 1800 V (correct)
  • 950 V
  • 1500 V

Where is the Traction Converter Cubicle installed?

The HT compartment of the motor coach.

What is the name of the unit that controls and monitors the Traction Converter?

  • SIBAS® 32S (correct)
  • DC Link Capacitor
  • PWM Inverter
  • 4QC Module

The Traction Converter works on a single voltage system.

<p>False (B)</p> Signup and view all the answers

What is the purpose of the Pre-charging Resistor in the Traction Converter?

<p>To prevent high inrush current when the converter is put into operation.</p> Signup and view all the answers

What is the name of the bridge that transforms the input voltage into a controlled direct voltage for the DC link circuit?

<p>Four Quadrant Chopper Module (4QC) (C)</p> Signup and view all the answers

The IGBTs are used as switches with a low closing sequence.

<p>False (B)</p> Signup and view all the answers

The brake chopper is connected to the brake chopper for protection only during over voltage protection of the DC link.

<p>True (A)</p> Signup and view all the answers

What is the purpose of the Protective Resistors in the Brake Chopper?

<p>To protect the system from serious faults as well as fires.</p> Signup and view all the answers

What kind of system is the Traction Converter Cabinet?

<p>Forced air-cooled system (B)</p> Signup and view all the answers

What is the type of the module that controls the four quadrants in the Traction Converter?

<p>IGBT Module (B)</p> Signup and view all the answers

Match the Traction Converter components with their corresponding functions:

<p>IGBT Module = 4 Quadrant Choppers PWM Inverter = Inverter DC Link Capacitor = DC Link Pre-charging Resistor = Pre-charging Circuit Main Blower = Cooling Auxiliary Blower = Churning Air Current Transducer = Current Monitoring SIBAS 32S = Traction Control Unit Auxiliary Contactor = Auxiliary Circuit DC/DC Power Supply = Driver Card Power Supply</p> Signup and view all the answers

What is the main function of the SIBAS 32S?

<p>It controls the traction converter.</p> Signup and view all the answers

Flashcards

Traction Converter Cubicle (TCC)

A completely assembled unit that houses the traction control unit (TCU) and other traction equipment. It's installed in the high voltage compartment of the motor coach.

What is the dual voltage system of the Traction Converter?

The traction converter can operate on either 1500V DC or 950V, 1ph, 50Hz AC. This allows for flexibility in different power supply environments.

What does 'Four Quadrant Chopper' mean?

It's a power electronic device that can control the direction and magnitude of electrical power flow in all four quadrants of the voltage-current plane. It converts AC to DC for the DC link.

What is the DC link circuit?

A high-voltage DC circuit that connects the four-quadrant chopper to the PWM inverters.

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What is the purpose of pre-charging?

It prevents high inrush currents when the traction converter is first turned on by gradually charging the DC link capacitor.

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What are IGBTs used for?

Insulated Gate Bipolar Transistors (IGBTs) are high-speed switches used to control the power flow in the four-quadrant chopper and PWM inverters.

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How does the PWM inverter work?

It uses Pulse Width Modulation (PWM) to create a variable AC voltage from the DC link voltage to power the traction motors.

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What is the function of the brake chopper?

It allows for regenerative braking by directing the motor's energy back into the DC link instead of dissipating it as heat.

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Describe the forced ventilation system.

The traction converter uses forced air cooling to prevent overheating. Fans blow air over the components to dissipate heat.

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What are the main components of the TCC?

The TCC includes the four-quadrant chopper, PWM inverters, DC link capacitors, contactors, transducers, blowers and other components.

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What does the designation 'A1, A2, A11, etc.' represent?

These designations indicate the physical location and role of each IGBT module within the TCC.

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What is a Line filter choke?

A device that helps to smooth out the ripple in the DC link current by filtering out high-frequency noise.

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What is a pre-charging resistor?

A resistor that's used to limit the current during the pre-charging process, protecting the components from damage.

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Why are transducers important?

Transducers convert one form of energy to another. They're used to monitor various electrical parameters, such as voltage and current, in the traction converter.

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What is the purpose of the SIBAS 32 S Traction Control Unit?

It's the 'brain' of the TCC, responsible for controlling and monitoring the traction converter's operation, including acceleration, braking and diagnostics.

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What is the role of the intermediate transformer?

It isolates the sensitive circuitry of the TCC from the high-voltage traction system.

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What is the purpose of the EMC capacitor?

It helps suppress electromagnetic interference (EMI) to prevent electrical noise from affecting the system.

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Describe the air flow direction in the traction converter.

The air flow is forced from the front bottom of the cabinet to the rear top, through the traction converter components, and then out of the cabinet.

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What is the difference between continuous rating and short time rating?

Continuous rating represents the power output that the traction converter can sustain for a long time, while short time rating is the power output that can be maintained for a short duration, like during acceleration.

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How does the traction converter help in regenerative braking?

During braking, the motor acts as a generator, converting kinetic energy into electrical energy, which is then returned to the DC link circuit for later use.

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What is the purpose of the auxiliary contactors?

They control the auxiliary circuits like the blowers, providing power for cooling the main components of the traction converter.

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What is the purpose of the auxiliary blowers?

They're used to circulate air within the traction converter cabinet, helping to distribute the cooling air more effectively.

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What is the role of the discharge resistors?

They safely discharge the energy stored in the DC link capacitors during fault conditions or when the traction converter is shut down.

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What do the temperature sensors monitor?

Temperature sensors monitor the temperature of critical components and provide information to the SIBAS system for control and protection.

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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 cabinet
  • Nominal input voltage is 2 x 950 V AC, 50 Hz / 1500V DC
  • AC input voltage range: 627 V - 1083 V
  • AC input voltage is related to a line voltage of 16.5-28.5 kV
  • AC input frequency range: 46 Hz - 54 Hz
  • DC input voltage range: 800 – 1800 V
  • Nominal DC link circuit voltage: AC Mode 1800 V, DC Mode 1500 V
  • Power factor in AC at different loads and line voltages is approximately unity.

Electrical System

  • The traction converter uses a dual voltage system (1500V DC or 950V, 1-phase, 50Hz AC (25kV AC line))
  • It has two four-quadrant choppers and two PWM inverters each supplying two traction motors
  • The converter has a DC link and various components including DC link capacitors, contactors, transducers, and blowers
  • The Siemens Traction control unit (TCU) SIBAS® 32S controls and monitors the converter.

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Related Documents

Maintenance Manual AC DC EMU (Siemens) - Draft for comments PDF

Description

This quiz covers the key components and electrical specifications of the traction converter cubicle used in motor coaches. It includes details on input voltage ranges, frequency, and the functionality of the traction control unit. Test your knowledge on the dual voltage system and related electrical systems within the converter.

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