Protection Curves; Introduction - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Protection curves

1 - Introduction

132 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
This chapter illustrates the trip curves of the available protections with all the protection trip units for SACE
Emax 2 circuit-breakers, represented in various dot diagrams.
Some notes for reading the diagrams:
• The curves are illustrated considering the minimum and maximum values and of the parameters of each
protection.
• Protections that have multiple functions (for example: G protection), are represented with multiple diagrams.
• The curves do not take account of the effects of special parameters such as thermal memory, startup or
presence of the Rating Plug L=OFF.
• Where not present, the curves are valid for both the IEC version and the UL version.
NOTE: for calculation of the tripping time, it is recommended to always use the mathematical
function provided in the protection summary table.
ABB | SACE Emax 2
Protection curves | 1 - Introduction