NOTE
In case of large mismatching, the indication 199.2494
REF err.: adverse Adaption factor CT
.
The setting value should then be increased.
The set value can be increased in the tripping quadrant depending on the arithmetic sum of the currents
(restraint by the sum of all current magnitudes) which is set at address 1313 SLOPE. This parameter can only
be set with DIGSI at Additional Settings. The preset value 0 is normally adequate.
In special cases it may be advantageous to delay the trip signal of the protection. This can be done by setting
an additional delay time (address 1312 T I-REF>). This parameter can only be set with DIGSI at Additional
Settings. This additional time delay is usually set to 0. This setting is a pure additional delay time which does
not include the inherent operating time of the protection.
Additional Restricted Earth Fault Protection Functions
In the aforementioned description, the first restricted earth fault protection is described respectively. The
differences in the parameter addresses and message numbers of the first and second restricted earth fault
protection are illustrated in the following table. The positions marked by x are identical.
Parameteraddresses Message no.
1. Restricted earth fault protection 13xx 199.xxxx(.01)
2. Restricted earth fault protection 14xx 205.xxxx(.01)
NOTE
In the following parameter overview the current values Ι/Ι
NS
refer to the rated current of the side to be
protected of the main protected object. If the restricted earth fault protection is not referred to the main
protected object, the rated current of the 3-phase measuring location is the applicable reference value.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr.
Parameter Setting Options Default Setting Comments
1301 REF PROT. OFF
ON
Block relay
OFF Restricted Earth Fault Protection
1311 I-REF> 0.05 .. 2.00 I/InS 0.15 I/InS Pick up value I REF>
1312A T I-REF> 0.00 .. 60.00 sec; ∞ 0.00 sec T I-REF> Time Delay
1313A SLOPE 0.00 .. 0.95 0.00 Slope of Charac. I-REF> = f(I-SUM)
Information List
No.
Information Type of
Informa-
tion
Comments
199.2404 >BLOCK REF SP >BLOCK restricted earth fault prot.
199.2411 REF OFF OUT Restricted earth fault is switched OFF
199.2412 REF BLOCKED OUT Restricted earth fault is BLOCKED
199.2413 REF ACTIVE OUT Restricted earth fault is ACTIVE
199.2421 REF picked up OUT Restr. earth flt.: picked up
199.2451 REF TRIP OUT Restr. earth flt.: TRIP
199.2491 REF Not avail. OUT REF err.: Not available for this object
2.3.4
2.3.5
Functions
2.3 Restricted Earth Fault Protection
134 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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