7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 38 of 77
3.4.2 Instantaneous Sensitive Earth Fault Protection (50SEF)
Two sensitive earth fault elements are provided in the 7SR1002/7SR1003 relay and four elements are provided in
the 7SR1004 relay.
50SEF-1, 50SEF-2, (50SEF-3 & 50SEF-4 – 7SR1004)
Each instantaneous element has independent settings for pick-up current
50SEF-n Setting
and a follower time
delay
50SEF-n Delay
. The instantaneous elements have transient free operation.
Where directional elements are present the direction of operation can be set using
50SEF-n Dir. Control
setting.
Directional logic is provided independently for each 50SEF-n element e.g. giving the option of using two elements
set to forward and two to reverse.
Operation of the instantaneous earth fault elements can be inhibited from:
Inhibit 50SEF-n
A binary or virtual input.
79 SEF Inst Trips:
50SEF-n
When ‘delayed’ trips only are allowed in the auto-reclose sequence
(
79 SEF Prot’n Trip n
=
Delayed
).
50SEF-n VTSAction:
Inhibit
Operation of the VT Supervision function.
Directional elements will not operate unless the zero sequence voltage (V
0
) is above the
67SEF Minimum
Voltage
setting i.e. the residual voltage is greater than 3 times this setting and the phase is in the
Forward/Reverse operating range.
50SEF-n
>
c
50SEF-n Setting
50SEF-n Delay
I
4
(I
SEF
)
General Pickup
Inhibit 50SEF-n
&
50SEF-n Element
Enabled
Disabled
&
79 P/F Inst Trips
= 50SEF-n
79 P/F Prot’n Trip n
= Delayed
AUTORECLOSE
Figure 3-12 Logic Diagram: 7SR10 SEF Instantaneous Element
Forward
Reverse
50SEF-n Dir.
Control
Non-Dir
≥
1
&
&
50SEF-n Dir En
67SEF Fwd
67SEF Rev
50SEF-n VTS Action
Off
Non-Dir
Inhibit
VT Fail
&
&
&
≥
1
Figure 3-13 Logic Diagram: 7SR10 SEF Instantaneous Element
3.4.3 Time Delayed Sensitive Earth Fault Protection (51SEF)
Two sensitive earth fault elements are provided in the 7SR1002/7SR1003 relay and four elements are provided in
the 7SR1004 relay.
51SEF-1, 51SEF-2, (51SEF-3 & 51SEF-4 – 7SR1004)
51SEF-n Setting
sets the pick-up current level.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC and ANSI curves using
51SEF-n Char
. A time multiplier is applied to the characteristic curves
using the
51SEF-n Time Mult
setting. Alternatively, a definite time lag (DTL) can be chosen using
51SEF-n Char
.
When DTL is selected the time multiplier is not applied and the
51SEF-n Delay (DTL)
setting is used instead.
Содержание 7SR10 Argus Series
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