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

1MRS758755 A
11.3.1.1
REC615 and RER615
Technical Manual
GUID-90BAEB05-E8FB-4F8A-8F07-E110DD63FCCF V1 EN
Figure 405: 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
747