Functions
2.4 Backup Overcurrent
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
92
Characteristic Curves for the 50N Element
During configuration of the scope of functions at address
126
, the available characteristics were determined.
Depending on the selection made there, only the parameters associated with this characteristic curve are ac-
cessible.
The inverse time elements enable the user to select different characteristic curves. Address
126
allows you to
specify whether you work with IEC characteristics (
50(N) 51(N) IEC
) or ANSI characteristics(
50(N)
51(N)ANSI
).
If you work with IEC characteristics, you can select the following setting options at address
2642
:
•
Normal Inverse
•
Very Inverse
•
Extremely Inv.
•
LongTimeInverse
If you work with ANSI characteristics, you can select the following setting options at address
2643
:
•
Inverse
•
Short Inverse
•
Long Inverse
•
Moderately Inv.
•
Very Inverse
•
Extremely Inv.
•
Definite Inv.
The characteristics and equations they are based on are listed in the „Technical Data“. They apply for direc-
tional and non-directional elements alike.