Industrial Electrical Systems - Unit 5: Diesel Power Stations

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Questions and Answers

What is the primary function of the air intake system in a diesel power station?

To supply necessary air to the engine for fuel combustion (correct)

To supply fuel to the engine

To cool the engine

To lubricate the engine

What is the purpose of the cooling system in a diesel power station?

To lubricate the engine

To reduce the noise level of the engine

To cool the engine exhaust gas

To keep the temperature of the engine parts within safe operating limits (correct)

What is the function of the lubricating system in a diesel power station?

To minimize the wear of rubbing surfaces of the engine (correct)

To cool the engine

To start the engine

To supply air to the engine

What is the primary function of the diesel engine in a diesel power station?

To produce mechanical energy Signup and view all the answers

What is the purpose of the silencer in the exhaust system of a diesel power station?

To reduce the noise level of the engine Signup and view all the answers

Why are diesel power stations used in places where demand of power is less?

Because they require less space and water Signup and view all the answers

What is the advantage of a diesel power station in terms of its thermal efficiency?

It is higher than that of a steam power station Signup and view all the answers

What is the function of the choke in the excitation unit of an alternator?

To adjust the terminal voltage at no-load condition Signup and view all the answers

Why are diesel power stations used as standby sets?

Because they can be started quickly and can pick up load in a short time Signup and view all the answers

What is the primary function of a UPS?

To safeguard equipment from power failure Signup and view all the answers

What is the purpose of the rectifier in a UPS?

To convert AC to DC voltage Signup and view all the answers

What is a disadvantage of a diesel power station in terms of its operation?

It does not work satisfactorily under overload conditions for a longer period Signup and view all the answers

What is the purpose of the batteries in a UPS?

To supply power during a mains failure Signup and view all the answers

What is the primary reason why diesel power stations are not used to generate bulk power?

Because they are more expensive to operate Signup and view all the answers

What is an advantage of a diesel power station in terms of its cost?

The overall cost is much less than that of a steam power station Signup and view all the answers

What is a disadvantage of a diesel power station in terms of its maintenance?

The cost of lubrication is generally high Signup and view all the answers

What is the primary function of a UPS?

To provide surge protection and backup power Signup and view all the answers

What is the advantage of a UPS over other immediate power supply systems?

Immediate protection against input power interruptions Signup and view all the answers

What is the purpose of a flywheel in a UPS?

To store energy Signup and view all the answers

What is the type of UPS that provides surge protection and backup power, but is the least expensive?

Off-line UPS Signup and view all the answers

What is the purpose of the rectifier in an on-line UPS?

To convert AC to DC Signup and view all the answers

What is the transfer time of an off-line UPS?

25 milliseconds Signup and view all the answers

What is the purpose of the tap-changing transformer in a line interactive UPS?

To change the tap depending on input voltage Signup and view all the answers

What is the type of UPS that is used where electrical isolation is mandatory?

On-line UPS Signup and view all the answers

What type of battery is commonly used in UPS systems?

Lead Acid/Plante Battery Signup and view all the answers

What is the unit of measurement used to size lead acid batteries designed for short discharge times?

Kilowatts per cell Signup and view all the answers

What is the purpose of calculating the battery capacity specifically for the operating temperature?

To ensure the battery operates efficiently at different temperatures Signup and view all the answers

What is the factor to consider when evaluating the efficiency of a UPS system?

Normal operating conditions Signup and view all the answers

What is the purpose of redundancy in a UPS system?

To provide backup in case of a failure Signup and view all the answers

What is the importance of considering the recommended operating temperature range for the batteries?

To align with the environmental conditions of the installation site Signup and view all the answers

What is the purpose of monitoring and management features in a UPS system?

To enable remote monitoring, diagnostics, and alerts Signup and view all the answers

What is the factor to consider when selecting a battery type for a UPS system?

Energy density, cycle life, and maintenance requirements Signup and view all the answers

What is a crucial factor to consider when selecting battery banks?

The physical size and weight of the battery banks Signup and view all the answers

Why is it important to implement a battery monitoring system?

To track the health and performance of the batteries Signup and view all the answers

What should be done to ensure overall system safety?

Implement safety measures such as proper ventilation Signup and view all the answers

What should be checked to assess the expected lifespan and replacement costs?

The warranty provided by the manufacturer Signup and view all the answers

What is essential for compliance and safety?

Adhering to local codes and regulations Signup and view all the answers

What should be done to ensure a reliable and efficient backup power system?

Ensuring seamless integration between the UPS and battery banks Signup and view all the answers

Who should be consulted when selecting UPS and battery banks?

A professional or a reputable supplier Signup and view all the answers

What should be developed to verify the functionality of both the UPS and battery banks?

A testing and maintenance schedule Signup and view all the answers

What is the primary function of the fuel supply system in a diesel power station?

To inject fuel oil into the engine cylinder Signup and view all the answers

What is the function of the exhaust system in a diesel power station?

To lead the engine exhaust gas outside the building and discharge it into the atmosphere Signup and view all the answers

What is the purpose of the silencer in the exhaust system of a diesel power station?

To reduce the noise level Signup and view all the answers

What is the function of the lubricating system in a diesel power station?

To minimize the wear of rubbing surfaces of the engine Signup and view all the answers

What is the purpose of a UPS?

To maintain a continuous supply of electrical power, even in the event of failure of the mains supply Signup and view all the answers

What is the primary function of the rectifier in a UPS?

To convert the mains alternating current (a.c.) supply to a direct current (d.c.) voltage Signup and view all the answers

What is the function of the batteries in a UPS?

To supply power during a mains failure Signup and view all the answers

What is a disadvantage of a diesel power station in terms of its maintenance?

High maintenance charges Signup and view all the answers

What is the main reason why diesel power stations are not used for generating bulk power?

Insufficient quantity of coal and water Signup and view all the answers

What is an advantage of diesel power stations in terms of their layout?

The design and layout of the plant are quite simple Signup and view all the answers

What is a disadvantage of diesel power stations in terms of their operation?

They have high running charges Signup and view all the answers

What is a characteristic of diesel power stations?

They can be started quickly Signup and view all the answers

Why are diesel power stations used as standby sets?

To provide backup power during outages Signup and view all the answers

What is an advantage of diesel power stations in terms of their cost?

The overall cost is much less than that of steam power stations Signup and view all the answers

What is a characteristic of diesel power stations?

They can be located at any place Signup and view all the answers

What is a disadvantage of diesel power stations in terms of their operation?

The plant does not work satisfactorily under overload conditions for a longer period Signup and view all the answers

What is the primary advantage of a UPS over other immediate power supply systems?

Immediate protection against input power interruptions Signup and view all the answers

What is the purpose of the tap-changing transformer in a line interactive UPS?

Voltage regulation Signup and view all the answers

Which type of UPS is used where electrical isolation is mandatory?

On-line UPS Signup and view all the answers

What is the transfer time of an on-line UPS?

Zero milliseconds Signup and view all the answers

What is the purpose of the rectifier in an off-line UPS?

Convert AC to DC Signup and view all the answers

What is the type of UPS that provides surge protection and backup power, but is the least expensive?

Off-line UPS Signup and view all the answers

What is the primary function of a UPS?

Supply power to the equipment Signup and view all the answers

What is the purpose of the batteries in a UPS?

Store energy for backup power Signup and view all the answers

What is an important consideration when selecting battery banks?

Physical size and weight Signup and view all the answers

Why is monitoring the health and performance of batteries important?

To ensure the reliability of the backup power system Signup and view all the answers

What should be implemented to enhance overall system safety?

Proper ventilation for batteries Signup and view all the answers

What should be checked to assess the expected lifespan and replacement costs of batteries?

Warranty Signup and view all the answers

Why is it essential to ensure seamless integration between the UPS and battery banks?

To increase the reliability of the backup power system Signup and view all the answers

What should be developed to verify the functionality of both the UPS and battery banks?

Testing and maintenance schedules Signup and view all the answers

Why is it important to consider the recommended operating temperature range for the batteries?

To increase the lifespan of the batteries Signup and view all the answers

Who should be consulted when selecting UPS and battery banks?

A professional or reputable supplier Signup and view all the answers

What is the unit of measurement used to size lead acid batteries designed for long-term discharge?

Ampere per cell Signup and view all the answers

What is the purpose of calculating the battery capacity specifically for the operating temperature?

To optimize battery performance and lifespan Signup and view all the answers

What is the factor to consider when evaluating the efficiency of a UPS system?

Efficiency during normal operating conditions Signup and view all the answers

What is the importance of considering the recommended operating temperature range for the batteries?

To optimize battery performance and lifespan Signup and view all the answers

What is the purpose of monitoring and management features in a UPS system?

To enable remote monitoring, diagnostics, and alerts Signup and view all the answers

What is a crucial factor to consider when selecting a battery type for a UPS system?

Energy density Signup and view all the answers

What is the purpose of redundancy in a UPS system?

To ensure system reliability in case of a failure Signup and view all the answers

What is a key consideration when selecting a UPS and battery banks?

Power backup requirements of the application Signup and view all the answers

Study Notes

Diesel Power Station (DG Set)

A generating station that uses a diesel engine as the prime mover for electrical energy generation
Diesel engine drives an alternator, converting mechanical energy into electrical energy
Advantages:
- Simple design and layout
- Occupies less space
- Can be located anywhere
- Quick start-up and load pick-up
- No standby losses
- Low water requirement for cooling
- Higher thermal efficiency than steam power stations
- Requires less operating staff
Disadvantages:
- High running charges due to costly fuel
- Poor performance under overload conditions
- Limited power generation capacity
- High lubrication costs
- High maintenance costs

Schematic Arrangement of Diesel Power Station

Auxiliaries include:
- Fuel supply system
- Air intake system
- Exhaust system
- Cooling system
- Lubricating system
- Engine starting system
Alternator is a salient pole type synchronous generator with adjustable voltage

Uninterruptible Power Supply (UPS)

A device that maintains continuous power supply during mains failure
Used to safeguard equipment, especially in data centers and large organizations
Working principle:
- Mains AC supply converted to DC voltage by rectifier
- DC voltage used to charge batteries or stored energy
- During mains failure, stored energy converted back to AC by inverter
- Power supplied to load or equipment
Types of UPS:
- On-line UPS
- Off-line UPS (Standby UPS)
- Line Interactive UPS
Battery types used in UPS systems:
- Lead acid/plante battery
- Lead acid/Antimony battery
- ... (other types listed in the text)

Battery Sizing

Manufacturers provide sizing information for batteries
Calculations consider temperature, watts per cell, amperes per cell, and other factors

Selection of UPS and Battery Banks

Key considerations:
- Power capacity
- Topology
- Redundancy
- Scalability
- Efficiency
- Compatibility
- Monitoring and management
- Form factor
For battery banks:
- Battery type
- Capacity and autonomy
- Charging time
- Temperature considerations
- Maintenance requirements
- Footprint
- Monitoring system
- Warranty
- Integration and safety
- Testing and maintenance

Diesel Power Station (DG Set)

A generating station that uses a diesel engine as the prime mover for electrical energy generation
Diesel engine drives an alternator, converting mechanical energy into electrical energy
Advantages:
- Simple design and layout
- Occupies less space
- Can be located anywhere
- Quick start-up and load pick-up
- No standby losses
- Low water requirement for cooling
- Higher thermal efficiency than steam power stations
- Requires less operating staff
Disadvantages:
- High running charges due to costly fuel
- Poor performance under overload conditions
- Limited power generation capacity
- High lubrication costs
- High maintenance costs

Schematic Arrangement of Diesel Power Station

Auxiliaries include:
- Fuel supply system
- Air intake system
- Exhaust system
- Cooling system
- Lubricating system
- Engine starting system
Alternator is a salient pole type synchronous generator with adjustable voltage

Uninterruptible Power Supply (UPS)

A device that maintains continuous power supply during mains failure
Used to safeguard equipment, especially in data centers and large organizations
Working principle:
- Mains AC supply converted to DC voltage by rectifier
- DC voltage used to charge batteries or stored energy
- During mains failure, stored energy converted back to AC by inverter
- Power supplied to load or equipment
Types of UPS:
- On-line UPS
- Off-line UPS (Standby UPS)
- Line Interactive UPS
Battery types used in UPS systems:
- Lead acid/plante battery
- Lead acid/Antimony battery
- ... (other types listed in the text)

Battery Sizing

Manufacturers provide sizing information for batteries
Calculations consider temperature, watts per cell, amperes per cell, and other factors

Selection of UPS and Battery Banks

Key considerations:
- Power capacity
- Topology
- Redundancy
- Scalability
- Efficiency
- Compatibility
- Monitoring and management
- Form factor
For battery banks:
- Battery type
- Capacity and autonomy
- Charging time
- Temperature considerations
- Maintenance requirements
- Footprint
- Monitoring system
- Warranty
- Integration and safety
- Testing and maintenance

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Description

This quiz covers the basics of diesel power stations, including the working principles of diesel generator sets, prime movers, and electrical energy generation.