Siemens SIPROTEC User Manual

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 = |3I
0
'-3I
0
''| - |3I
0
'+3I
0
''|
REF D = |3I
0
'| for REF S ≤ 0
REF D = |3I
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)

Siemens SIPROTEC Specifications

General

Brand	Siemens
Model	SIPROTEC
Category	Protection Device
Language	English