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Questions and Answers
Match the following types of distribution systems with their classifications based on NATURE OF CURRENT:
Match the following types of distribution systems with their classifications based on NATURE OF CURRENT:
D.C Distribution System = Uses direct current A.C. Distribution System = Uses alternating current
Match the following types of distribution systems with their classifications based on TYPE OF CONSTRUCTION:
Match the following types of distribution systems with their classifications based on TYPE OF CONSTRUCTION:
Overhead system = Cheaper than underground system Underground system = Used where overhead construction is impracticable
Match the following types of distribution systems with their classifications based on SCHEME OF CONNECTION:
Match the following types of distribution systems with their classifications based on SCHEME OF CONNECTION:
Radial system = Type of connection system Ring main system = Type of connection system Interconnected system = Type of connection system
Match the following statements with the correct reason for the widespread use of alternating current:
Match the following statements with the correct reason for the widespread use of alternating current:
Match the method of obtaining a 3-wire DC system with the correct description:
Match the method of obtaining a 3-wire DC system with the correct description:
Match the following advantages/disadvantages with their corresponding overhead vs underground system:
Match the following advantages/disadvantages with their corresponding overhead vs underground system:
Match the load currents with their respective generators in the two generator method:
Match the load currents with their respective generators in the two generator method:
Match the advantages or disadvantages with the appropriate method of obtaining a 3-wire DC system:
Match the advantages or disadvantages with the appropriate method of obtaining a 3-wire DC system:
Match the following characteristics with their corresponding overhead vs underground system:
Match the following characteristics with their corresponding overhead vs underground system:
Match the following statements with their corresponding systems:
Match the following statements with their corresponding systems:
Match the component connected permanently to diametrically opposite points with the correct method of obtaining a 3-wire DC system:
Match the component connected permanently to diametrically opposite points with the correct method of obtaining a 3-wire DC system:
Match the following features with their corresponding systems:
Match the following features with their corresponding systems:
Match the following voltage levels with their corresponding primary distribution system:
Match the following voltage levels with their corresponding primary distribution system:
Match the following terms with their correct description:
Match the following terms with their correct description:
Match the following components with their respective functions in the distribution system:
Match the following components with their respective functions in the distribution system:
Match the following classifications with their corresponding distribution systems:
Match the following classifications with their corresponding distribution systems:
Match the method of obtaining a 3-wire DC system with the correct description:
Match the method of obtaining a 3-wire DC system with the correct description:
Match the components of the balancer set with their functions:
Match the components of the balancer set with their functions:
Match the characteristics of overhead and underground systems with their descriptions:
Match the characteristics of overhead and underground systems with their descriptions:
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Study Notes
Distribution Systems Classification
- Distribution systems can be classified based on the nature of current into AC (Alternating Current) and DC (Direct Current) systems.
- The type of construction classification includes overhead lines and underground cables.
- Scheme of connection addresses methods such as radial, ring, and mesh configurations.
Use of Alternating Current
- Alternating current is widely used due to its ability to easily transform voltages, facilitating long-distance electricity transmission.
- AC systems are more economical for higher voltage transmission compared to DC systems.
3-Wire DC System
- A 3-wire DC system utilizes two positive and one negative wire to provide a balanced load.
- The method of obtaining this system involves connecting a generator’s center tap to a common ground, reducing voltage drop.
Overhead vs Underground Systems
- Overhead systems are generally less expensive and easier to maintain but are more susceptible to environmental factors.
- Underground systems are more reliable and have aesthetic benefits but are often more costly and complicated to repair.
Generator Load Currents
- In a two-generator method, each generator provides power to different loads.
- Proper matching of load currents with generators ensures stable operation and efficiency.
Components and Functions
- Key components of distribution systems include transformers (voltage regulation), circuit breakers (protection), and conductors (current transmission).
- The balancer set includes components that manage load balancing across phases to ensure efficiency.
Voltage Levels in Distribution
- Primary distribution systems typically operate at voltage levels ranging from 11 kV to 33 kV.
- These levels are crucial for ensuring safe and efficient energy transfer.
Characteristics Comparison
- Overhead systems are characterized by greater visibility and ease of access for maintenance but present safety risks during storms.
- Underground systems provide better safety against weather but involve complex installation and higher upfront costs.
Key Definitions and Terms
- Understanding key terms such as “neutral,” “phase,” and “ground” is essential for comprehending distribution systems.
- Each term has distinct implications for system design, safety, and operation.
Summary of Features per System
- Each distribution system type has unique features influencing operational efficiency, cost, and installation requirements.
- Identifying specific characteristics aids in appropriate system selection based on application needs.
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