TRIPPING ENERGY LOADS DURING UNDER-FREQUENCY EVENTS BASED ON DECELERATION OF RATE OF CHANGE OF FREQUENCY

Systems and methods are disclosed for tripping energy loads in an energy transmission system based on Rate of Change of Frequency (RoCoF). An initial RoCoF of electrical voltage in the energy transmission system is detected and a determination is performed of whether the initial RoCoF falls within a predetermined frequency band. A corresponding amount of energy load to trip is armed, and at least one tripping delay timer is started. While the at least one tripping delay timer is running, a deceleration RoCoF of electrical voltage is detected, and a determination is performed of whether a frequency of the electrical voltage has decayed past a tripping frequency threshold. A time at which to trip the amount of energy load is determined, based at least in part on the deceleration RoCoF of electrical voltage, and the amount of energy load is tripped at the determined time.