ABB SACE Tmax XT2 - Curves

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 81
25 - Curves
Introduction
This chapter includes the tripping curves of the protections, represented in different point graphs:
 The curves are represented considering the maximum and minimum values of the
parameters of each protection.
 The protections that have multiple curves (e.g., protection S), are represented in multiple
charts.
 The curves do not take into account the effects of special parameters like thermal memory
and startups.
NOTES: to calculate the trip time it is recommended to always use the mathematical
function in the protections summary table (page 78)
L curve (t= k/I
2
)