Day 1

Communication Assisted Protection
Basic concept of communication assisted protection
Description of different communication channels (Power line carrier, fiber, etc.)
Schemes

  1. Blocking
  2. Unblocking
  3. POTT
  4. PUTT
  5. DTTRemote breaker OpenApplication criterion of each scheme
  6. Advantages and Disadvantages of major schemes
  7. Weak Infeed
  8. Sequential trip

Analyzing Event and Sequence of Event Reports
Basic concept of communication assisted protection
Description of different communication channels (Power line carrier, fiber, etc.)
Schemes
COMTRADE Files
Description, construction and uses of COMTRADE files
SS1 files
Description, construction and uses of SS1s

Testing:
Replaying COMTRADE files and analyzing reports generated by target relays.
Analyze sample event report and sequence of events
Set up end-to-end test
Run the tests and analyze the results using Doble software and COMTRADE files from the relays

Day 2

Testing:

Run the tests using Doble State Simulation and SS1 files and analyze the results using Doble software and COMTRADE files from the relays
Line Current Differential
Basics of line current differential

  • Different methods used to perform line current differential relaying

Testing:

  • Test various elements of line current differential relaying

Bus differential relaying

  • Basics of Bus differential relaying
  • High impedance and low impedance bus differential

Day 3

Testing:

  • Test high impedance bus differential relaying

Out-of-Step Protection

  • What are power swings?
  • Stable and unstable swings
  • Various methods of detecting unstable swings
  • Blocking and tripping functions in relays related to out-of-step protection

Testing of Out-of-Step Function

  • Test Out-of-step blocking function
  • Test Out-of-step tripping function