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7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 35 of 77
3.3.2 Instantaneous Measured Earth Fault Protection (50G)
Two instantaneous measured earth fault elements are provided in the 7SR1002/7SR1003 relay and four elements
are provided in the 7SR1004 relay.
50G-1, 50G-2, (50G-3 & 50G-4 – 7SR1004)
Each instantaneous element has independent settings for pick-up current
50G-n Setting
and a follower time
delay
50G-n Delay
. The instantaneous elements have transient free operation.
Where directional elements are present the direction of operation can be set using
50G-n Dir. Control
setting.
Directional logic is provided independently for each 50G-n element e.g. giving the option of using two elements
set to forward and two to reverse.
Operation of the instantaneous measured earth fault elements can be inhibited from:
Inhibit 50G-n
A binary or virtual input.
79 E/F Inst Trips:
50G-n
When ‘delayed’ trips only are allowed in the auto-reclose sequence
(
79 E/F Prot’n Trip n
=
Delayed
).
50G-n Inrush Action: Block
Operation of the inrush current detector function.
50G-n VTSAction:
Inhibit
Operation of the VT Supervision function.
50G-n
>
c
50G-n Setting
Forward
Reverse
50G-n Dir.
Control
Non-Dir
≥
1
&
&
50G-n Dir En
67G Fwd
67G Rev
50G-n Delay
50G-n VTS Action
Off
Non Dir
Inhibit
VT Fail
&
&
&
≥
1
51G/50G Measurement
General Pickup
Inhibit 50G-n
&
50G-n Element
Enabled
Disabled
81HBL2
50G-n Inrush
Action
Off
Inhibit
&
50G-n Dir En
&
79 P/F Inst Trips
= 50G-n
79 P/F Prot’n Trip n
= Delayed
AUTORECLOSE
IL4 (I
G
)
Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element
Содержание 7SR10 Argus Series
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