8.3 Generator Assessment & Roles During Restoration Flashcards
What is included in the Generation Report section of the hourly generation report required during restoration?
- Capacity and energy online
- # of generators online
- # of subsystems (islands)
What is included in the Load Restoration Report section of the hourly generation report required during restoration?
- Total customer load restored
- # customers restored
- % customers restored
- % customers restored last hour
What is included in the Capacity Due In section of the hourly generation report required during restoration?
- Generation in 1, 3, and 6 hours
What else is included in the the hourly generation report required during restoration? (4)
- Units online since last report
- Units expected during next hour
- Damage detected since last report
- Cranking power
Describe the sequence of events during restoration (6 steps)
- Determine surviving on-line generation
- Stabilize surviving online generation
- Determine status of off-line generation
- Determine preferred sequence of starting offline generation
- Prepare offline generators for startup
- Restore aux power to offline generation
What types of generators can be started in what order?
- Hydro started quickly w/o outside source
- Small CT’s quickly (10 min), large CTs up to 1 hour
- Drum steam - 1-20 hours dep. on status
- Super critical steam 4-20 hrs dep. on status
- Nuclear at least 24 hours and maybe 48 or longer
- Hot units may be returned quicker
What band is frequency maintained to during restoration?
59.75 to 61.0 Hz
Who has priority access to cranking power?
- Hot units that can return to service w/in 4 hours
- Regulating units to ensure stable system frequency
What are the 3 parameters that must be matched in order to synchronize, and what happens if they are not matched?
- Voltage magnitude (excess MVAR flow)
- Frequency (sudden change in MW flow)
- Phase angle (excess MW flow)
Shedding ____% of load results in approx. ___ Hz frequency change
6-10% for 1 Hz
How much regulation is required before synchronizing an area?
2% of system load
What do Reference and Incoming voltages refer to during synchronization?
Reference = bus voltage Incoming = generator voltage
When the synchroscope is moving clockwise, what does this mean as far as gen. vs bus frequency?
Generator f > bus f
