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ABB | SACE Tmax XT

13 - Functions

Introduction This chapter includes the trip curves of the protections, which are shown in different point charts:
• The curves are represented considering the maximum and minimum values of the parameters of
each protection, including the TRIP functions provided (current, time).
• Protections with several curves (example: S protection), are shown in several graphs.
• The curves do not take account of the effects of special parameters, such as thermal memory and
startups.
NOTE: it is advisable to always use the mathematical function in the summary table of the
protections to calculate the trip time (page 75)

Function L (t = k/I )
2

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