Protection functions have been modelled as below - these should be considered jointly with the R Group
| Logical Node | Function |
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1 | PDIF | Differential | 2 | PDIR | Directional comparison | 3 | PDIS | Distance | 4 | PDOP | Directional over power | 5 | PDUP | Directional under power | 6 | PFRC | Rate of change of frequency | 7 | PHAR | Harmonic restraint | 8 | PHIZ | Ground detector | 9 | PIOC | Instantaneous over current | 10 | PMRI | Motor restart inhibit | 11 | PMSS | Motor starting time supervision | 12 | POPF | Over power factor | 13 | PPAM | Phase angle measuring | 14 | PRTR | Rotor protection | 15 | PSCH | Protection scheme | 16 | PSDE | Sensitive directional earthfault | 17 | PTEF | Transient earth fault | 18 | PTHF | Thyristor protection | 19 | PTOC | Time overcurrent | 20 | PTOF | Overfrequency | 21 | PTOV | Overvoltage | 22 | PTRC | Protection trip conditioning | 23 | PTTR | Thermal overload | 24 | PTUC | Undercurrent | 25 | PTUF | Underfrequency | 26 | PTUR | Under Resistance | 27 | PTUV | Undervoltage | 28 | PUPF | Underpower factor | 29 | PVOC | Voltage controlled time overcurrent | 30 | PVPH | Volts per Hz | 31 | PZSU | Zero speed or underspeed |
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