•
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
2.1.3.1 Setting Notes). 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.
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
To Next Page
Loading...
Need help?
General
