•
For definite time overcurrent protection (phases):
Address 2111 or 2112 for pickup value
I>>
,
Address 2113 for delay time
T I>>
,
Address 2114 or 2115 for pickup value
I>
,
Address 2116 for delay time
T I>
;
•
For inverse time overcurrent protection (phases) acc. to IEC curves:
Address 2121 or 2122 for pickup value
Ip
,
Address 2123 for time multiplier
T Ip
;
•
For inverse time overcurrent protection (phases) acc. to ANSI curves:
Address 2121 or 2122 for pickup value
Ip
,
Address 2124 for time multiplier
D Ip
.
User-defined Characteristics
For inverse time overcurrent protection the user may define his own tripping and dropout characteristic. For
configuration in DIGSI a dialogue box appears. Enter up to 20 pairs of current value and tripping time value.
Die eingegebene Kennlinie kann in DIGSI auch grafisch dargestellt werden.
[ausloesekennl-260602-kn, 1, en_GB]
Figure 2-77
Entry and visualisation of a user-specific trip characteristic with DIGSI - example
In order to be able to create a user-defined tripping characteristic, the following must be set during configura-
tion of the scope of functions in address 120
DMT/IDMT Phase
, option
User Defined PU
(see Section
). If you also want to specify the dropout characteristic, set
User def. Reset
.
The value pairs refer to the setting values for current and time.
Since current values are rounded in a specific pattern before they are processed in the device, we recommend
to use exactly the same preferred current values you can find in
Table 2-7
Preferred values of standardized currents for User-defined trip characteristics
Ι
/
Ι
p
= 1 to 1.94
Ι
/
Ι
p
= 2 to 4.75
Ι
/
Ι
p
= 5 to 7.75
Ι
/
Ι
p
= 8 to 20
1.00
1.50
2.00
3.50
5.00
6.50
8.00
15.00
1.06
1.56
2.25
3.75
5.25
6.75
9.00
16.00
1.13
1.63
2.50
4.00
5.50
7.00
10.00
17.00
1.19
1.69
2.75
4.25
5.75
7.25
11.00
18.00
1.25
1.75
3.00
4.50
6.00
7.50
12.00
19.00
1.31
1.81
3.25
4.75
6.25
7.75
13.00
20.00
1.38
1.88
14.00
Functions
2.4 Time Overcurrent Protection for Phase and Residual Currents
150
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Summary of Contents for SIPROTEC 4 7UT6 Series
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