Generator Balancer Set Methods

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Questions and Answers

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:

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:

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:

Alternating voltage can be conveniently changed in magnitude by means of a transformer. = Reason for AC preference over DC Transformer enables transmission of AC power at high voltage and utilization at a safe potential. = Reason for AC preference over DC Signup and view all the answers

Match the method of obtaining a 3-wire DC system with the correct description:

Two generator method = Requires two separate generators 3-wire DC generator = Consists of a standard 2-wire machine with added coils Out of balance current (I1 − I2) = Flows through the neutral wire in the two generator method High reactance and low resistance coils = Connected to diametrically opposite points in the 3-wire DC generator Signup and view all the answers

Match the following advantages/disadvantages with their corresponding overhead vs underground system:

Higher current carrying capacity = Overhead system Lower inductive reactance = Underground system Longer useful life = Underground system Low maintenance cost = Underground system Signup and view all the answers

Match the load currents with their respective generators in the two generator method:

I1 = Supplied by generator G1 I2 = Supplied by generator G2 Signup and view all the answers

Match the advantages or disadvantages with the appropriate method of obtaining a 3-wire DC system:

Principal disadvantage of two generator method = Requires two separate generators Costly method = Two generator method due to necessity of two generators Signup and view all the answers

Match the following characteristics with their corresponding overhead vs underground system:

Potential electromagnetic interference with communication circuits = Overhead system Less chance of faults and service interruptions from external factors = Underground system Signup and view all the answers

Match the following statements with their corresponding systems:

Useful life of more than 50 years = Underground system Maintenance cost is very low = Underground system Signup and view all the answers

Match the component connected permanently to diametrically opposite points with the correct method of obtaining a 3-wire DC system:

High reactance and low resistance coils = 3-wire DC generator Signup and view all the answers

Match the following features with their corresponding systems:

Causes electromagnetic interference with telephone lines = Overhead system No interference with communication circuits = Underground system Signup and view all the answers

Match the following voltage levels with their corresponding primary distribution system:

11 kV = Primary distribution system 6.6 kV = Primary distribution system 3.3 kV = Primary distribution system 220 V = Secondary distribution system Signup and view all the answers

Match the following terms with their correct description:

Primary distribution system = Operates at voltages somewhat higher than general utilization Secondary distribution system = Operates at lower voltages for average low-voltage consumers Step-down substation = Located between transmission system and consumers' meters Generating station = Origin of electric power transmitted at high voltage Signup and view all the answers

Match the following components with their respective functions in the distribution system:

Step-down transformer = Reduces voltage from high to 11 kV in substation Conductors = Carries reduced current due to high transmission voltages Consumers' meters = End point where electrical energy is measured for billing Substations = Points where voltage is stepped down for distribution Signup and view all the answers

Match the following classifications with their corresponding distribution systems:

Primary distribution system = Handles large blocks of electrical energy Secondary distribution system = Serves average low-voltage consumers 3-phase, 3-wire system = Utilized for primary distribution due to economic reasons A.C. distribution system = Electric system between step-down substation and consumers' meters Signup and view all the answers

Match the method of obtaining a 3-wire DC system with the correct description:

Balancer set = Obtained from 2-wire DC system using two identical DC shunt machines coupled mechanically Neutral wire = Taken out from the junction of armatures of machines A and B in the balancer set Potential difference = Maintained equal on two sides of neutral by the balancer set Overhead vs Underground system = Distribution system mounted on poles or placed underground depending on various factors Signup and view all the answers

Match the components of the balancer set with their functions:

Generator G = Supplies power to the whole system Machines A and B = Identical DC shunt machines coupled mechanically Field windings joined in series = Armatures and field windings of machines A and B connected this way Earthed junction of armatures = Point where neutral wire is taken out Balancer set = Maintains equal potential difference on both sides of neutral Signup and view all the answers

Match the characteristics of overhead and underground systems with their descriptions:

Public safety = Underground system considered safer as all distribution wiring is underground Initial cost = Factor influencing choice between overhead and underground systems Overhead lines = Mounted on wooden, concrete, or steel poles carrying distribution transformers Underground system = Uses conduits, cables, and manholes under streets and sidewalks Signup and view all the answers

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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Description

Learn about the Two generator method for obtaining a 3-wire DC system where two shunt wound DC generators G1 and G2 are connected in series. Each generator supplies load on its own side with a neutral point obtained in between.

Generator Balancer Set Methods

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Podcast

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 TYPE OF CONSTRUCTION:

Match the following types of distribution systems with their classifications based on SCHEME OF CONNECTION:

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 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 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 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 following features with their corresponding systems:

Match the following voltage levels with their corresponding primary distribution system:

Match the following terms with their correct description:

Match the following components with their respective functions in the distribution system:

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 components of the balancer set with their functions:

Match the characteristics of overhead and underground systems with their descriptions:

Study Notes

Distribution Systems Classification

Use of Alternating Current

3-Wire DC System

Overhead vs Underground Systems

Generator Load Currents

Components and Functions

Voltage Levels in Distribution

Characteristics Comparison

Key Definitions and Terms

Summary of Features per System

Studying That Suits You

Description

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