Functions
2.10 Restricted Earth Fault Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
272
The value message 5826
„REF D:“
is the tripping value stabilized via the tripping characteristic. The reported
values
„REF S:“
and
„REF D:“
refer to the time when the output message 5816
„REF T start“
is report-
ed, i.e. the starting time of
T I-REF>
(address
4112
).
The following relations apply for calculating the quantities (see section 2.10 margin heading „Evaluation of
measurement quantities“):
REF S = |3
I
0
' - 3
I
0
''| - |3
I
0
' + 3
I
0
''|
REF D = |3
I
0
'|
for REF S
≤
0
REF D = |3
I
0
'| - k · REF S
for EDS S > 0 (with k = 4)
2.10.4
Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Additional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding second-
ary nominal current of the current transformer.
2.10.5
Information List
Addr.
Parameter
C
Setting Options
Default Setting
Comments
4101
REF PROT.
OFF
ON
OFF
Restricted Earth Fault Pro-
tection
4111
I-REF>
1A
0.05 .. 2.00 A
0.15 A
Pick up value I REF>
5A
0.25 .. 10.00 A
0.75 A
4112A
T I-REF>
0.00 .. 60.00 sec;
∞
0.00 sec
T I-REF> Time Delay
4113A
SLOPE
0.00 .. 0.95
0.00
Slope of Charac. I-REF> =
f(I-SUM)
No.
Information
Type of In-
formation
Comments
5803
>BLOCK REF
SP
>BLOCK restricted earth fault prot.
5811
REF OFF
OUT
Restricted earth fault is switched OFF
5812
REF BLOCKED
OUT
Restricted earth fault is BLOCKED
5813
REF ACTIVE
OUT
Restricted earth fault is ACTIVE
5816
REF T start
OUT
Restr. earth flt.: Time delay started
5817
REF picked up
OUT
Restr. earth flt.: picked up
5821
REF TRIP
OUT
Restr. earth flt.: TRIP
5826
REF D:
VI
REF: Value D at trip (without Tdelay)
5827
REF S:
VI
REF: Value S at trip (without Tdelay)
