ABB REG316 4 Series - Rate-Of-Change of Frequency Protection

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-197
3.5.19. Rate-of-change of frequency protection (df/dt)
A. Application
· Static, dynamic and adaptive load shedding in power utility
and industrial distribution systems
· Generator protection.
B. Features
· one phase voltage as input variable
· supervises the rate-of-change df/dt of the frequency
· provision for enabling by absolute frequency
· insensitive to DC component
· insensitive to harmonics and other high-frequency signals
· undervoltage blocking.
C. Inputs and outputs
I. C.t./v.t. inputs
· voltage
II. Binary inputs
· blocking
III. Binary outputs
· blocked by undervoltage
· tripping
IV. Measurements
· rate-of-change of frequency
· absolute frequency
· voltage amplitude.