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7SR18 Description Of Operation
Unrestricted ©2018 Siemens Protection Devices Limited
Page 33 of 78
(fwd)
fwd
rev
fwd
rev
fwd
rev
(rev)
L1 Fwd
L1 Rev
L3 Fwd
L2 Fwd
L3 Rev
L2 Rev
Directional
Control Signal
Figure 3.3.1-1 Logic Diagram: Directional Overcurrent Element (67)
3.3.2
Instantaneous Overcurrent Protection (50)
Up to four Instantaneous overcurrent elements are provided (depending upon variant): -
50-1, 50-2, 50-3 & 50-4
Each instantaneous element (50-n) has independent settings.
50-n Setting
for pick-up current and
50-n Delay
follower time delay. The instantaneous elements have transient free operation.
Where directional elements are present the direction of operation can be set using
50-n Dir. Control
setting.
Directional logic is provided independently for each 50-n element, e.g. giving the option of using two elements set
to forward and two to reverse.
Operation of the instantaneous overcurrent elements can be inhibited from:
Inhibit 50-n
A binary or virtual input.
79 P/F Inst Trips: 50-n
When ‘delayed’ trips only are allowed in the auto-reclose sequence
(
79 P/F Prot’n Trip n
=
Delayed
).
50-n Inrush Action: Block
Operation of the inrush current detector function.
50-n VTS Action: Inhibit
Operation of the VT Supervision function.
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