Standard Inverse-Time Characteristics For Overvoltage Protection - ABB RELION REX640 Technical Manual

1MRS759142 C
11.3.1.1
REX640
Technical Manual
GUID-298EBB9E-51D4-473E-8641-5A1E0584C914 V1 EN
Figure 881: Operate time curve based on IDMT characteristic with Minimum
operate time set to 1 second

Standard inverse-time characteristics for overvoltage protection

The operate times for the standard overvoltage IDMT curves are defined with the
coefficients A, B, C, D and E.
The inverse operate time can be calculated with the formula:
General function block features
Section 11
1693