Quiz

Question 1 of 10

A single transmission line trips on a hot afternoon and within seconds a wide region is blacked out, even though total generation exceeded total demand. What best explains this?

• AThe tripped line was the only source of generation for the region
• BPower redistributed onto already-loaded neighboring lines, which tripped protectively in turn, accelerating a cascade
• CDemand suddenly exceeded generation across the entire interconnection
• DThe blackout was caused by operator error in dispatching reserves