417-01 Switchgear

When you complete this lesson, you will be able to describe the function and operation of switchgear. You will be able to identify the equipment that makes up a switchgear system and describe the purpose of protection relays.

• Describe what switchgear is and explain how it is used
• Identify types of switchgear by voltage
• Describe the use and purpose of the following:
  • Breakers and switches
  • Generator breaker
  • Electrical bus
  • Switchgear relays
• Describe the type of indication and communication employed by switchgear relays

417-02 Low Voltage Breakers

When you complete this lesson, you will understand the purpose and use of low voltage circuit breakers in electrical circuits.

• Describe the function of low voltage breakers
• Describe low voltage, molded case breakers and low voltage, large frame breakers; identify their differences
• Explain how to connect a large frame breaker
• Define the low voltage breaker voltage category
• Describe how an arc is formed and extinguished
• Explain why breakers trip and describe breaker closing and tripping devices

417-03 Medium and High Voltage Switchgear

When you complete this lesson, you will be able to identify the technical details associated with construction and operation of high and medium voltage switchgears.

• Identify the basic theory and design of medium voltage switchgear
• Identify the basic theory and design of high voltage switchgear
• Describe the function and interrupting mediums of High Voltage and Medium Voltage operating mechanisms
• Identify common switching considerations
• Identify modern Medium Voltage switchgear applications

417-04 General Switchgear Maintenance

When you complete this lesson, you will be able to identify and perform the common tasks and tests related to modern switchgear.

• Identify general circuit breaker maintenance tasks
• Identify tasks associated with standard operating mechanism maintenance
• Identify tasks associated with hydraulic and pneumatic operating mechanism maintenance
• Describe the three common electrical tests conducted on large circuit breakers

417-05 Breaker Specific Maintenance

When you complete this lesson, you will be able to complete breaker specific maintenance tasks in order to maximize breaker life and maintain system stability.

• Identify shared maintenance tasks associated with air-magnetic and vacuum breakers
• Identify specific maintenance tasks related to air-magnetic circuit breakers
• Identify specific maintenance tasks related to vacuum circuit breakers
• Identify specific maintenance tasks related to oil circuit breakers
• Identify specific maintenance tasks related to gas-blast circuit breakers
• Identify specific maintenance tasks related to air-blast circuit breakers

417-06 Circuit Breaker Time-Travel Characteristics and Testing

When you complete this lesson, you will be able to identify the purpose and principles of circuit breaker time-travel testing and explain the processes associated with conducting the three types of time-travel testing.

• Identify the purpose of time-travel testing
• Identify the principles of time-travel testing
• Identify the characteristics of circuit breaker time
• Identify the characteristics of circuit breaker travel
• Identify equipment used in circuit breaker time-travel testing
• Compare operating processes of drop bar, light beam and digital timer/analyzer recorders