7SG11 Argus Technical Reference
©2013 Siemens Protection Devices Limited
P20007 Page 11 of 71
Figure 1.5-3 and Figure 1.5-4 show the instantaneous highset and lowset outputs. These instantaneous operate
times i.e.delay setting td = 0.005 apply to non-directional characteristics. Where directional control is applied then
the directional element operate time (section 1.4.4) should be added to give total maximum operating time.
1.4.2 Earth-fault Overcurrent Protection
A main characteristic (IDMTL, DTL) and 3 DTL characteristics (Lowset, Highset 1 and Highset 2) are provided.
1.4.2.1
Time Delayed Characteristic
Specification as for phase-fault overcurrent (section 1.4.1.1).
1.4.2.2
Lowset, Highset 1, Highset 2
Specification as for phase-fault overcurrent (section 1.4.1.2).
1.4.3 Sensitive/Restricted Earth-fault Protection
A single element with three timing characteristics (lowset, DTL1 and DTL2) is provided.
Operate Level
Attribute
Value
Is
Current setting
0.005, 0.010…0.960 x
In
I
op
Operate level
100 %
Is
, 5% or 1 % In
Reset level
95 %
I
op,
5% or 1 % In
Repeatability
1 %
-10 °C to +55 °C
5 %
Variation
47 Hz to 52 Hz
57 Hz to 62 Hz
5 %
Note. SEF relays are required to suppress 2
nd
, 3
rd
and higher harmonics and have a frequency response at
minimum setting as shown in Figure 1.5-5.
Operate Time
Attribute
Value
t
lowset
,
t
DTL1
,
t
DTL2
Delay setting (lowset, DTL1, DTL2)
0.00, 0.01…20.00, 20.5 …100, 101 … 300 s
lowset
t
lowset
, 1% or 10 ms
DTL1
t
DTL1
, 1% or 10 ms
Operating time
DTL2
t
DTL1
+
t
DTL2
, 1% or 10 ms
Repeatability
1 % or 10 ms
Overshoot time
< 40 ms
Disengaging time
< 42 ms
Variation
47 Hz to 52 Hz
57 Hz to 62 Hz
5%
Figure 1.5-6 shows the sensitive earth fault starter output. This instantaneous operate time applies to non-
directional characteristics. Where directional control is applied then the directional element operate time
(section1.4.4) should be added to give total maximum operating time.
1.4.4 Directional Characteristics
Applies to Argus 2 and Argus 6 relays only.
Directional characteristics can be applied to phase-fault overcurrent elements, earth-fault overcurrent elements
and single-pole sensitive earth-fault models.
Two types of directional element exist, referred to below as type I and type II. On a particular model the type of
element in the relay can be identified from the range of the angle setting as listed below: -