Rate-Of-Change Of Frequency Protection - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. F
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.
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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
·
II. Binary inputs
·
III. Binary outputs
·
·
IV. Measurements
·
·
·
voltage
blocking
blocked by undervoltage
tripping
rate-of-change of frequency
absolute frequency
voltage amplitude.
ABB Switzerland Ltd
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