DEFxPDEF supports both DT and IDMT characteristics. The user can select the timer characteristics with the Operating curve type setting.
The protection relay provides 16 IDMT characteristics curves, of which seven comply with the IEEE C37.112 and six with the IEC 60255-3 standard. Two curves follow the special characteristics of ABB praxis and are referred to as RI and RD. In addition to this, a user programmable curve can be used if none of the standard curves are applicable. The user can choose the DT characteristic by selecting the Operating curve type values "ANSI Def. Time" or "IEC Def. Time". The functionality is identical in both cases.
The following characteristics, which comply with the list in the IEC 61850-7-4 specification, indicate the characteristics supported by different stages.
| Operating curve type | DEFLPDEF | DEFHPDEF |
|---|---|---|
| (1) ANSI Extremely Inverse | x | x |
| (2) ANSI Very Inverse | x | |
| (3) ANSI Normal Inverse | x | x |
| (4) ANSI Moderately Inverse | x | |
| (5) ANSI Definite Time | x | x |
| (6) Long Time Extremely Inverse | x | |
| (7) Long Time Very Inverse | x | |
| (8) Long Time Inverse | x | |
| (9) IEC Normal Inverse | x | |
| (10) IEC Very Inverse | x | |
| (11) IEC Inverse | x | |
| (12) IEC Extremely Inverse | x | |
| (13) IEC Short Time Inverse | x | |
| (14) IEC Long Time Inverse | x | |
| (15) IEC Definite Time | x | x |
| (17) User programmable curve | x | x |
| (18) RI type | x | |
| (19) RD type | x |
| Reset curve type | DEFLPDEF | DEFHPDEF | Note |
|---|---|---|---|
| (1) Immediate | x | x | Available for all operate time curves |
| (2) Def time reset | x | x | Available for all operate time curves |
| (3) Inverse reset | x | x | Available only for ANSI and user programmable curves |