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

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

<p>1000V (D)</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 (B)</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. (B)</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 (D)</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. (C)</p> Signup and view all the answers

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

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

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

<p>Battery charger (B)</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. (D)</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. (C)</p> Signup and view all the answers

What occurs if both BUR1 and BUR2 fail?

<p>Ventilation is managed by BUR3 at 42Hz. (B)</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 (A)</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 (C)</p> Signup and view all the answers

What auxiliary function does BUR3 perform related to battery management?

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

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

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

What is the general operating frequency of BUR3?

<p>50Hz (C)</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. (D)</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. (D)</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. (D)</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. (C)</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. (C)</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. (C)</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. (C)</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. (B)</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. (C)</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. (B)</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 (B)</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 (A)</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 (D)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>42Hz (B)</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 (C)</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 (C)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

Which components does BUR3 feed with a fixed frequency supply?

<p>Compressor motors (B)</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. (D)</p> Signup and view all the answers

How does load changeover between auxiliary converters occur?

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

What happens if BUR3 fails?

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

How is the speed of the traction motor blowers adjusted?

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

What is the operating frequency of BUR3?

<p>50Hz (C)</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. (B)</p> Signup and view all the answers

Under normal operation, which contactors are closed?

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

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

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

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

<p>Cab fans (D)</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 (B)</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 (A)</p> Signup and view all the answers

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

<p>110V (B)</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 (B)</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 (C)</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 (C)</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 (B)</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. (A)</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 (D)</p> Signup and view all the answers

In normal operation, which contactors are open?

<p>52/2, 52/4, 52.1/1 (B)</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. (B)</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 (B)</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 (A)</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. (A)</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. (D)</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 (A)</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 (D)</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. (B)</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. (D)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

Flashcards

Auxiliary Circuit (WAP5/WAG9)

The system in locomotives (WAP5 and WAG9) that powers auxiliary motors, including single-phase and three-phase ones.

Single-Phase Auxiliary Circuit

Part of the auxiliary circuit that uses single-phase electricity to power loads like blowers and heaters.

Auxiliary Transformer

A transformer that reduces the voltage from the main transformer to power single-phase auxiliary loads.

Machine Room Blowers

Blowers that cool the electronic components and pressurize the machine room in the locomotive.

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3-Phase Auxiliary Circuit

Part of the auxiliary circuit using three-phase electricity to power auxiliary motors.

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Static Auxiliary Converter

A device that converts power from a three-phase to the appropriate voltage for auxiliary motors without moving parts.

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Redundancy in Auxiliary Converters

The ability of the system to automatically switch to a backup converter in case of a failure in one of the auxiliary converters.

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Cooling Mode Operation

A function that automatically raises the pantograph and closes the VCB to enable cooling in case of overheating.

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Main Transformer (Auxiliary Winding)

The transformer providing power to both single-phase and three-phase auxiliary circuits.

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Cab Fan

A fan for air circulation and cooling inside the train cab.

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BUR1/BUR2 Function

Supply variable voltage and frequency to traction motor blowers, oil cooler blowers, and bogie blowers.

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BUR3 Function

Supplies fixed-frequency power to essential equipment like compressors, pumps, and the battery charger.

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Variable Speed Control

Adjusts the speed of blowers (17Hz, 33Hz, 50Hz) based on temperature.

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BUR3 Voltage

Maintains a voltage of approximately 415V, adjustable based on charging needs.

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Compressor Soft Start

Reducing BUR3 voltage and frequency to zero to prevent quick start damage.

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Auxiliary Converter Isolation

Automatic switching between auxiliary converters in case of failure.

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BUR1/BUR2 Backup

BUR1 or BUR2 can support auxiliary components in event of the other's failure.

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BUR3 Backup

If BUR3 fails, BUR2 supplies specific auxiliaries (compressors, etc.) at 50Hz, and BUR1 provides other auxiliary support.

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Contactor Switching

Electro-pneumatic contactors automatically switch between power sources (different branches).

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Maximum Frequency Limit

Frequency is limited to 42Hz for certain operations when a backup system is used.

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Auxiliary Circuit in WAP5/WAG9

The electrical system in WAP5 and WAG9 locomotives that powers auxiliary motors and devices using both single-phase and three-phase currents.

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Redundancy in Converters

The system has backup converters that automatically switch on if one of the main converters fails, ensuring continuous operation.

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What are BUR1 & BUR2 used for?

BUR1 and BUR2 supply variable voltage and frequency to the traction motor blowers, oil cooler blowers, and scavenger blowers of the bogies.

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What is BUR3's primary function?

BUR3 supplies a fixed frequency supply to the compressors, oil pumps, and the battery charger.

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How is blower speed controlled?

The speed of traction motor blowers, oil cooler blowers, and scavenger blowers is adjusted in three steps (17Hz, 33Hz, 50Hz) depending on the temperature sensed by the sensors.

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What happens when BUR1 fails?

If BUR1 fails, BUR2 takes over and supplies power to the auxiliaries for both bogies, but with a maximum frequency limit of 42Hz.

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What happens when BUR2 fails?

If BUR2 fails, BUR1 takes over supplying power to both bogies' auxiliaries, also with a maximum frequency limit of 42Hz.

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What happens when BUR3 fails?

If BUR3 fails, BUR2 takes over supplying power to the compressors and battery charger at a fixed frequency of 50Hz. BUR1 supports the ventilation auxiliaries for both bogies at a maximum frequency of 42Hz.

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What is the role of contactors?

Electro-pneumatic contactors automatically switch the power source between the auxiliary converters in case of failure or load changes.

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What is the maximum frequency limit for backup operations?

When a backup system like BUR1 or BUR2 takes over, the maximum frequency allowed is 42Hz.

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How does BUR3 handle compressor start-up?

When a compressor starts, BUR3 reduces its output voltage and frequency to near zero and then ramps up gradually to achieve a soft start.

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What is the typical output voltage of BUR3?

BUR3 usually provides a voltage around 415V. However, it can vary slightly depending on the battery charging requirements

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Auxiliary Circuit

The electrical system in locomotives that powers auxiliary motors and devices like blowers and heaters, using both single-phase and three-phase currents.

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What are BUR1 and BUR2?

BUR1 and BUR2 are auxiliary converters that provide variable voltage and frequency to the traction motor blowers, oil cooler blowers, and scavenger blowers.

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What does BUR3 do?

BUR3 is an auxiliary converter that provides a fixed frequency supply to the compressors, oil pumps, and battery charger.

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What happens if BUR1 fails?

If BUR1 fails, BUR2 takes over and supplies power to the auxiliaries for both bogies, but with a maximum frequency limited to 42Hz.

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What happens if BUR2 fails?

If BUR2 fails, BUR1 takes over and supplies power to both bogies' auxiliaries, also with a maximum frequency limited to 42Hz.

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What happens if BUR3 fails?

If BUR3 fails, BUR2 takes over supplying power to the compressors and battery charger at 50Hz. BUR1 supports the ventilation auxiliaries for both bogies at 42Hz.

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What are contactors?

Contactors are electro-pneumatic switches that automatically switch the power source between different auxiliary converters in case of failure or load changes.

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Single-Phase Circuit

The part of the Auxiliary Circuit that uses single-phase electricity to power loads like blowers and heaters.

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3-Phase Circuit

The part of the Auxiliary Circuit that uses three-phase electricity to power auxiliary motors.

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BUR1 & BUR2

These are auxiliary converters that provide variable voltage and frequency to the traction motor blowers, oil cooler blowers and scavenger blowers of the bogies.

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BUR3

This is an auxiliary converter that supplies a fixed frequency supply to the compressors, oil pumps, and the battery charger.

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Contactors

These are electro-pneumatic switches that automatically switch the power source between different auxiliary converters in case of failure or load changes.

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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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