Relays
21
What is a Distance Relay
When is Flat Frequency used?
What is used when tie-lines tie-line data is unavailable - islanded situations
What is PTDF
What is the percentage change of electrical loading on a line due to electrical power transfer (interchange) from one area to another
1% drop in frequwncy equals
what is 2% of load
Inadvertent Interchange
What is the Difference between Actual and Scheduled
87
What Is Differential Protective Relay
When is Flat Tie-Line used
What is used when frequency data is unavailable - Restoration Conditions
What should be done during high load periods
What is use capacitive resources to provide reactive power to support voltage
5% decrease in Voltage equals
What is 3% decrease in load
2 ways to payback interchange
Unilateral and Bilateral
51 TN
What is Transformer Neutral Overcurrent Relay
When is Tie-Line Bias used
Uses both Tie-Line and frequency data
Used at all times unless detrimental to operation of system
What type of line carries the most load
What is underground because of less impedance
Reportable Manual Load shed
what is 100 MW
Who implements interchange
What is All BA's along path
78
What is Phase Angle Measuring or Out of Step Protective Relay
What is Isochronous Mode
How many hours of emergency operations training shall be provided to TO's each year
32 Hours/ 5 days
Reportable loss of Firm Load
What is 300 MW
Who cancels or Terminates Interchange
What is The Sink BA
67-2
What is Differential Ground Overcurrent Relay..
(Trips on Phase to ground Faults)
Governor Droop
The amount of frequency difference it takes to move a generator from 0- 100%
What is the approximate MVAR losses on a 10 mile, 230 KV line?
What is 9-10 MVARs
1/3 per mile
DCS Compliance must equal
100% to the 15 minute recovery of the Disturbance Control Standard
What is cosine of theta?
The Cos theta or cos θ is the ratio of the adjacent side to the hypotenuse, where θ is one of the acute angles. The cosine formula is as follows: C o s Θ = A d j a c e n t H y p o t e n u s e.