Podcast
Questions and Answers
What is the main purpose of the machine room blowers in the auxiliary circuit?
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?
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?
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?
How does the 3-phase auxiliary converter differ from the Arno Converter?
What occurs if the machine room temperature exceeds 70°C?
What occurs if the machine room temperature exceeds 70°C?
What is the typical operating voltage of the auxiliary winding from the main transformer?
What is the typical operating voltage of the auxiliary winding from the main transformer?
What type of loads are connected to the 110V AC circuit in the single phase auxiliary circuit?
What type of loads are connected to the 110V AC circuit in the single phase auxiliary circuit?
What advantage does the load distribution among the Bur's provide in the auxiliary circuit?
What advantage does the load distribution among the Bur's provide in the auxiliary circuit?
What type of motors does the 3-phase auxiliary circuit provide power for?
What type of motors does the 3-phase auxiliary circuit provide power for?
What is one of the primary functions of the cab heaters in the auxiliary circuit?
What is one of the primary functions of the cab heaters in the auxiliary circuit?
What is the maximum frequency limit for ventilation when BUR1 fails?
What is the maximum frequency limit for ventilation when BUR1 fails?
Which component is fed by BUR3 at a fixed frequency of 50Hz?
Which component is fed by BUR3 at a fixed frequency of 50Hz?
How does the speed of the traction motor blowers vary?
How does the speed of the traction motor blowers vary?
What happens to BUR3's output voltage and frequency when a compressor starts?
What happens to BUR3's output voltage and frequency when a compressor starts?
What occurs if both BUR1 and BUR2 fail?
What occurs if both BUR1 and BUR2 fail?
Which contactors are closed when BUR1 is isolated?
Which contactors are closed when BUR1 is isolated?
What type of supply does BUR1&2 provide to the traction motor blowers?
What type of supply does BUR1&2 provide to the traction motor blowers?
What auxiliary function does BUR3 perform related to battery management?
What auxiliary function does BUR3 perform related to battery management?
What mechanism aids in load changeover between auxiliary converters during isolation?
What mechanism aids in load changeover between auxiliary converters during isolation?
What is the general operating frequency of BUR3?
What is the general operating frequency of BUR3?
What is the primary distinction between the single phase and 3-phase auxiliary circuits in the locomotives?
What is the primary distinction between the single phase and 3-phase auxiliary circuits in the locomotives?
How does the static auxiliary converter's operation differ fundamentally from that of a conventional Arno Converter?
How does the static auxiliary converter's operation differ fundamentally from that of a conventional Arno Converter?
What function do the scavenge blowers serve in the auxiliary circuit of the locomotives?
What function do the scavenge blowers serve in the auxiliary circuit of the locomotives?
In the case of a failure of any auxiliary converter, what ensures required redundancy within the auxiliary circuit?
In the case of a failure of any auxiliary converter, what ensures required redundancy within the auxiliary circuit?
What operational strategy is implemented to prevent the machine room temperature from exceeding 70°C during peak summer?
What operational strategy is implemented to prevent the machine room temperature from exceeding 70°C during peak summer?
What role do the machine room blowers play during the locomotive's operation?
What role do the machine room blowers play during the locomotive's operation?
What is the purpose of the 415V AC circuit within the single phase auxiliary circuit?
What is the purpose of the 415V AC circuit within the single phase auxiliary circuit?
When does the machine room blower activate to lower the temperature in emergency situations?
When does the machine room blower activate to lower the temperature in emergency situations?
What type of loads are primarily serviced by the 110V AC circuit in the single phase auxiliary circuit?
What type of loads are primarily serviced by the 110V AC circuit in the single phase auxiliary circuit?
How are the auxiliary circuits energized in the WAP5 and WAG9 locomotives?
How are the auxiliary circuits energized in the WAP5 and WAG9 locomotives?
What is the primary role of BUR3 in the auxiliary circuit?
What is the primary role of BUR3 in the auxiliary circuit?
What occurs to BUR3's voltage and frequency during the start of a compressor?
What occurs to BUR3's voltage and frequency during the start of a compressor?
What limitation is placed on BUR1 and BUR2 when one of them fails?
What limitation is placed on BUR1 and BUR2 when one of them fails?
How does the auxiliary converter electronics respond during isolation of one converter?
How does the auxiliary converter electronics respond during isolation of one converter?
Which contactors remain closed when BUR2 is isolated?
Which contactors remain closed when BUR2 is isolated?
What is the maximum frequency BUR2 can provide for ventilation when BUR1 fails?
What is the maximum frequency BUR2 can provide for ventilation when BUR1 fails?
What is the effect on BUR3 if it gets isolated?
What is the effect on BUR3 if it gets isolated?
What are the operating frequencies for the traction motor blowers controlled by BUR1 and BUR2?
What are the operating frequencies for the traction motor blowers controlled by BUR1 and BUR2?
What happens to the output voltage of BUR3 during normal operation?
What happens to the output voltage of BUR3 during normal operation?
What connections are made when BUR1 is isolated?
What connections are made when BUR1 is isolated?
What is the maximum frequency BUR1 can provide for ventilation if BUR2 fails?
What is the maximum frequency BUR1 can provide for ventilation if BUR2 fails?
Which components does BUR3 feed with a fixed frequency supply?
Which components does BUR3 feed with a fixed frequency supply?
What happens to BUR3's output voltage and frequency upon starting a compressor?
What happens to BUR3's output voltage and frequency upon starting a compressor?
How does load changeover between auxiliary converters occur?
How does load changeover between auxiliary converters occur?
What is the speed control mechanism for the traction motor blowers?
What is the speed control mechanism for the traction motor blowers?
What happens if BUR3 fails?
What happens if BUR3 fails?
How is the speed of the traction motor blowers adjusted?
How is the speed of the traction motor blowers adjusted?
What is the operating frequency of BUR3?
What is the operating frequency of BUR3?
What is the role of contactors within the system during isolation events?
What is the role of contactors within the system during isolation events?
Under normal operation, which contactors are closed?
Under normal operation, which contactors are closed?
What primary function do the machine room blowers serve?
What primary function do the machine room blowers serve?
What is the maximum voltage output of the auxiliary transformer to the single phase circuit?
What is the maximum voltage output of the auxiliary transformer to the single phase circuit?
At what temperature must the machine room be maintained to ensure proper operation of control electronics?
At what temperature must the machine room be maintained to ensure proper operation of control electronics?
Which of the following is NOT a load connected to the 415V AC circuit?
Which of the following is NOT a load connected to the 415V AC circuit?
What characteristic sets the static auxiliary converter apart from the Arno Converter?
What characteristic sets the static auxiliary converter apart from the Arno Converter?
How is redundancy achieved in the load distribution among the auxiliary converters?
How is redundancy achieved in the load distribution among the auxiliary converters?
What voltage does the auxiliary transformer provide to the 110V AC circuit?
What voltage does the auxiliary transformer provide to the 110V AC circuit?
What is the primary benefit of the auxiliary circuit being distinctly separated for single phase and 3-phase machines?
What is the primary benefit of the auxiliary circuit being distinctly separated for single phase and 3-phase machines?
Which component in the auxiliary circuit is responsible for regulating the voltage output to auxiliary machines?
Which component in the auxiliary circuit is responsible for regulating the voltage output to auxiliary machines?
What happens when the machine room blower is activated in high-temperature situations?
What happens when the machine room blower is activated in high-temperature situations?
What is the maximum frequency that BUR1 or BUR2 can supply for ventilation when one of them fails?
What is the maximum frequency that BUR1 or BUR2 can supply for ventilation when one of them fails?
What operational behavior occurs when a compressor is started with respect to BUR3?
What operational behavior occurs when a compressor is started with respect to BUR3?
What is the primary function of the auxiliary transformer in the single phase circuit?
What is the primary function of the auxiliary transformer in the single phase circuit?
In normal operation, which contactors are open?
In normal operation, which contactors are open?
How is load changeover between auxiliary converters facilitated during isolation?
How is load changeover between auxiliary converters facilitated during isolation?
Which of the following loads operate at 110V AC in the single phase auxiliary circuit?
Which of the following loads operate at 110V AC in the single phase auxiliary circuit?
What action does the control circuit take when the machine room temperature exceeds 70°C?
What action does the control circuit take when the machine room temperature exceeds 70°C?
What role does BUR3 play in feeding auxiliary components?
What role does BUR3 play in feeding auxiliary components?
What change happens to BUR2 and BUR1 when BUR3 fails?
What change happens to BUR2 and BUR1 when BUR3 fails?
What distinguishes the static auxiliary converter from conventional auxiliary converters?
What distinguishes the static auxiliary converter from conventional auxiliary converters?
When do the 415V and 110V AC auxiliary circuits get energized?
When do the 415V and 110V AC auxiliary circuits get energized?
What action is taken by the control electronics for traction motor blowers based on temperature sensing?
What action is taken by the control electronics for traction motor blowers based on temperature sensing?
What aspect of BUR3's output voltage is influenced by the battery charging requirement?
What aspect of BUR3's output voltage is influenced by the battery charging requirement?
What is the main advantage of the load distribution among the BURs in the auxiliary circuit?
What is the main advantage of the load distribution among the BURs in the auxiliary circuit?
What function do the scavenge blowers serve in the auxiliary circuit?
What function do the scavenge blowers serve in the auxiliary circuit?
Which characteristic of the auxiliary converter electronics impacts maintenance efficiency?
Which characteristic of the auxiliary converter electronics impacts maintenance efficiency?
Flashcards
Auxiliary Circuit (WAP5/WAG9)
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
Single-Phase Auxiliary Circuit
Part of the auxiliary circuit that uses single-phase electricity to power loads like blowers and heaters.
Auxiliary Transformer
Auxiliary Transformer
A transformer that reduces the voltage from the main transformer to power single-phase auxiliary loads.
Machine Room Blowers
Machine Room Blowers
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3-Phase Auxiliary Circuit
3-Phase Auxiliary Circuit
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Static Auxiliary Converter
Static Auxiliary Converter
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Redundancy in Auxiliary Converters
Redundancy in Auxiliary Converters
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Cooling Mode Operation
Cooling Mode Operation
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Main Transformer (Auxiliary Winding)
Main Transformer (Auxiliary Winding)
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Cab Fan
Cab Fan
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BUR1/BUR2 Function
BUR1/BUR2 Function
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BUR3 Function
BUR3 Function
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Variable Speed Control
Variable Speed Control
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BUR3 Voltage
BUR3 Voltage
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Compressor Soft Start
Compressor Soft Start
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Auxiliary Converter Isolation
Auxiliary Converter Isolation
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BUR1/BUR2 Backup
BUR1/BUR2 Backup
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BUR3 Backup
BUR3 Backup
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Contactor Switching
Contactor Switching
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Maximum Frequency Limit
Maximum Frequency Limit
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Auxiliary Circuit in WAP5/WAG9
Auxiliary Circuit in WAP5/WAG9
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Redundancy in Converters
Redundancy in Converters
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What are BUR1 & BUR2 used for?
What are BUR1 & BUR2 used for?
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What is BUR3's primary function?
What is BUR3's primary function?
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How is blower speed controlled?
How is blower speed controlled?
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What happens when BUR1 fails?
What happens when BUR1 fails?
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What happens when BUR2 fails?
What happens when BUR2 fails?
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What happens when BUR3 fails?
What happens when BUR3 fails?
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What is the role of contactors?
What is the role of contactors?
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What is the maximum frequency limit for backup operations?
What is the maximum frequency limit for backup operations?
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How does BUR3 handle compressor start-up?
How does BUR3 handle compressor start-up?
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What is the typical output voltage of BUR3?
What is the typical output voltage of BUR3?
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Auxiliary Circuit
Auxiliary Circuit
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What are BUR1 and BUR2?
What are BUR1 and BUR2?
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What does BUR3 do?
What does BUR3 do?
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What happens if BUR1 fails?
What happens if BUR1 fails?
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What happens if BUR2 fails?
What happens if BUR2 fails?
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What happens if BUR3 fails?
What happens if BUR3 fails?
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What are contactors?
What are contactors?
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Single-Phase Circuit
Single-Phase Circuit
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3-Phase Circuit
3-Phase Circuit
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BUR1 & BUR2
BUR1 & BUR2
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BUR3
BUR3
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Contactors
Contactors
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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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