Instantaneous Overcurrent Protection (50); Figure 4.1-2 Logic Diagram: Instantaneous Over-Current Element - Siemens Solkor 7PG2113 Technical Manual

4.1.2

Instantaneous Overcurrent Protection (50)

Two Instantaneous overcurrent elements are provided in the 7PG2113/5 relay and four elements are provided in
the 7PG2114/6 relay.
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
79 P/F Inst Trips: 50-n
50-n Inrush Action: Block
50-n VTS Action: Inhibit

Figure 4.1-2 Logic Diagram: Instantaneous Over-current Element

©2010 Siemens Protection Devices Limited
50-1, 50-2, (50-3 & 50-4 – 7PG2114/6)
A binary or virtual input.
When 'delayed' trips only are allowed in the auto-reclose sequence
(79 P/F Prot'n Trip n = Delayed).
Operation of the inrush current detector function.
Operation of the VT Supervision function (7PG2114/6).
7PG2113/4/5/6 Solkor Description of Operation
Chapter 1 Page 37 of 80