This course deals with advanced testing involving communication assisted protection, analysis of even reports, COMTRADE and ss1 files, line current differential relays, bus differential protection testing. Out-of-step testing concept will be presented. Each testing section will be preceded by the theory on related relaying.
This course is intended for the following audience:
- Senior level technicians who are involved with testing of electro-mechanical/microprocessor relays
- Technicians who wish to enhance their knowledge of reading event reports, complex relaying, advanced testing techniques, end-to-end testing, out-of-step relaying, bus differential and line current differential.
Day 1:
Communication Assisted Protection
- Basic concept of communication assisted protection
- Description of different communication channels (Power line carrier, fiber, etc.)
- Schemes
- Blocking
- Unblocking
- POTT
- PUTT
- DTT
- Sequential trip
- Remote breaker Open
- Weak Infeed
- Analyzing Event and Sequence of Event Reports
- COMTRADE Files
- SS1 files
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
- Basics of line current differential
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
- Testing low impedance bus differential relaying (SEL 487B)
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
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