Definition
The standard frequency of the alternating current power system in North America, equal to 60 cycles per second (60 Hz). Because AC current reverses direction, this means 120 current reversals per second — each full cycle includes one reversal in each direction. All generators synchronized to the AC grid must maintain their rotational speed precisely to hold 60 Hz; any imbalance between generation and load causes frequency to deviate above or below nominal. Frequency is the universal real-time indicator of generation–load balance: rising frequency signals excess generation, falling frequency signals excess load. NERC reliability standards require automatic, rapid frequency response to limit deviations and prevent underfrequency load shedding or generator tripping.
Topic Deck
Electrical Engineering Fundamentals
Source
FERC Pro Forma OATT / LGIP