REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-259
3.5.26. Pole slipping (Pole-Slip)
A. Application
The pole slipping function detects the condition of a generator
that is completely out-of-step with the power system.
B. Features
· detection of slip frequencies in relation to the power system
of 0.2 to 8 Hz
· alarm before the first slip (rotor angle pick-up setting)
· discriminates generating and motoring directions of rotor
phase-angle
· discriminates an internal and an external power swing centre
· trips after a set number of slips
· trips within a set rotor angle.
C. Inputs and outputs
I. Analogue inputs:
·
current
· voltage
II. Binary inputs:
· blocking of the entire function
· blocking operation in generating direction (to left)
· blocking operation in motoring direction (to right)
· external enable for zone1.
III. Binary outputs:
· alarm before the first slip
· operation for generating slip (to left)
· operation for motoring slip (to right)
· first operation in zone 1
· first operation in zone 2
· nth. operation in zone 1 (tripping)
· nth. operation in zone 2.
IV. Measurements:
· slip impedance
· slip frequency.
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