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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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