P Group - Protection Functions (31)
- Rodney Hughes
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Protection functions have been modelled as below - these should be considered jointly with the R Group
| Logical Node | Function | |
|---|---|---|
| 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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