| Protective functions | IEC 61850 | ANSI | KOMBISAVE+ |
|---|---|---|---|
| Nondirectional overcurrent, two-level | PTOC | 50/51 | RN |
| Switch failure protection | RBRF | 50BF | RN |
| Automatic reclosure | RREC | 79 | RN |
|
Thermal overload: One- or two-body model of thermal overload (e.g. for motors, cables, dry and oil transformers) | PTTR | 49 & 49II | RN |
| Minimal current | PTUC | 37 | RN |
| Inrush protection | PHAR | 68 | RN |
| Switch-onto-fault protection | PIOC | 50 | RN |
| Nondirectional ground current, two-level | PTOC | 50N/51N | RN |
| Autoreclosure lock | PMRI | 66/86 | RN |
| Locked rotor protection | PZSU | 14 | RN |
| Load-jam protection | PTOC | 51M | RN |
| Phase balance | PTOC | 46 | RN |
| Start-up time monitoring | PMSS | 46 | RN |
| Busbar protection according to H2 | PSCH | 85 | RD |
| Zero current, two levels, U0 | PTOV | 59G | RD |
|
Basic directional ground short circuit protection for low-resistance and rigid grids | PTOC | 67N | RD |
|
Bidirectional ground fault for isolated, compensated grids (watt and P/Q) | PTEF/PSDE | 32N | RD |
|
Bidirectional intermittent ground fault for isolated, compensated grids (energy) | PTEF/PSDE | 67NIEF | RD |
| Bidirectional short circuit protection: two-level | PTOC | 67 | RD |
| Under/overvoltage protection depending on the two-level | PTUV/PTOV | 27/59 | RD |
| Under/overfrequency protection depending on the two-level | PTUV/PTOV | 81U/81O | RD |
| Synchrocheck | RSYN | 25 | RD |
| Rotary field check | – | 47 | RD |
| Error locating with parallel performance compensation | RFLO | 21FL | RD |
| Distance protection, current under-impedance, and V/C starting | PSCH/PDIS/PTOC | 21 | RZ |
| QV protection | RD | ||
| Voltage imbalance | PTOV | 47O | RD |
| Load shedding UFLS | PTUV | 81LSH | RD |
|
Ground fault differential protection (*=double,**=triple-wound transformer) | PDIF | 87NL | RT |
|
Two-level transformer differential protection (*=double,**=triple-wound transformer) | PDIF | – | RT |
| Line differential protection | PDIF | – | RL |
| Protection-related functions | IEC 61850 | ANSI | KOMBISAVE+ |
|---|---|---|---|
| Transfer trips | PSCH | LAL | RD |
| Signal comparison (phases and ground faults) | PSCH | 85 | RD |
| Power monitor with H2 | PSCH | 85H2 | RD |
| Control | IEC 61850 | ANSI | KOMBISAVE+ |
|---|---|---|---|
| Circuit breaker control | XSWI | I↔O CB | all |
| Disconnector control | XSWI | I↔O DCC | AU |
| Grounding control | XSWI | I↔O DCC | AU |
| Control with interlocking scheme | XCBR | I↔O | AU |
| Field control | CBAY | CBAY | AU |
| Local remote switchover | LOCREM | R/L | AU |
| Key switch | SCILO | KEY | all |
| Monitoring | |||
| Trigger circuit monitor | SCBR | TCS | AU |
| Voltage transformer automatically tripped | QRFUF | 60 | AU |
| Auxiliary voltage monitor | NZBAT | – | AU |
| Circuit breaker failure protection | CBCM | 50BF | AU |
| Measuring | IEC 61850 | ANSI | KOMBISAVE+ |
|---|---|---|---|
| Three-phase current display | MMXU | 3I | AU |
| Three-phase voltage display LE | MMXU | 3ULE | RD |
| Three-phase voltage display LL | MMXU | 3ULL | RD |
| Ground current | MMXU | I0 | RD |
| Zero voltage | MMXU | U0 | RD |
| P/Q/S power | MMXU | SPQ | RD |
| Power factor cos | MMXU | cos | RD |
| Frequency | MMXU | f | RD |
| Operating impedance RLL, RLE, XLL, XLE | MMXU | R/X | RZ |
| Difference values between two systems: ΔU, Δf, Δa | MMXU | DU, Df, Da | RZ |
| 15 mins mean value with date per phase | MMXU | 3I /15 mins | all |
| Events and fault data | IEC 61850 | ANSI | KOMBISAVE+ |
|---|---|---|---|
| Number of events: Grid, malfunction, message, operation, test | >1,000 | ||
| - measurements | all | ||
| Number of COMTRADE | 15 s | ||
| Display: Main error, time, date, measurements | all | ||
| - Basic measurements V/C | all | ||
| - BASIC error locating: (DIRECTION) | RD | ||
| - Error locating: km/miles, R/X | RZ |
| Key | |
| RN: Easy definite-time protection | RZ: Distance protection |
| RB: 16.7 Hz definite-time protection | RL: Distance protection with power differential protection |
| RD: Directional definite-time protection and ground fault | RT: Transformer differential protection |
| Comment: Actual function is contained in RN as well as in the higher value RZ |