Line Protection

Learning objectives

  • Recall the purpose of Transmission Relay Loadability
  • Identify the applicability of PRC-023-4 to functional entities
  • Recall the process of coordinating protection between fuses and overcurrent protection relays
  • Recall the difference between fuse saving and fuse blowing protection schemes
  • Identify the strengths and weaknesses of using overcurrent protection relays
  • Identify the strengths and weaknesses of using distance relays
  • Recall how ground fault relay settings are different between distribution and transmission systems
  • Recall the process by which mutual induction can cause false trips in adjacent lines
  • Define overlapping zones of protection
  • Identify methods of protection against voltage instability
  • Recall the difference between manual and automatic load shedding

Course overview

Without reliable transmission capability, generation units throughout the BPS are useless. Transmission lines are highways allowing energy to travel from source to load to support customer demand. As such, protecting these lines is as critical as protecting systems that generate and distribute energy. Protecting these lines depends on:

  • Properly loading transmission line relays
  • Identifying the characteristics of overcurrent and ground faults
  • Recognizing zone of protection and voltage instability protection

The Line Protection training course explains basic power system line relay loadability. It also discusses how to apply various protection methods to isolate faults on those lines. This online course includes:

  • Transmission relay loadability
  • Overcurrent protection
  • Ground fault protection
  • Distance relaying
  • Voltage instability protection

This course is part of the System Protection training series.

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