The rated voltage is the base voltage from a standardized series of voltages that determine the level of insulation of the network and electrical equipment.
Actual voltages at various points in the system may slightly differ from the nominal, but they should not exceed the highest operating voltages established for continuous operation.
The rated voltage at sources and receivers of electricity (generators, transformers) is the voltage for which they are designed in normal operation. The rated voltages of electric networks and the sources and receivers of electric energy connected to them are established by GOST.
Standardized stress series
- Installations up to 1000 V
Range of rated voltages of three-phase four-wire or three-wire AC systems 50 Hz, V [1]
| 230 | 400 | 690 |
- Installations over 1000 V
| Rated voltage | The greatest working voltage |
|---|---|
| 3 | 3.6 |
| 6 | 7.2 |
| ten | 12 |
| 15 | 17.5 |
| 20 | 24 |
| 35 | 40.5 |
| 110 | 126 |
| 150 | 172 |
| 220 | 252 |
| 330 | 363 |
| 400 | 420 |
| 500 | 525 |
| 750 | 787 |
| 1150 | 1200 |
Nominal voltages for electric generators , synchronous compensators , secondary windings of power transformers are adopted at 5-10% higher than the nominal voltages of the corresponding networks, which takes into account voltage losses when current flows along the lines.
Notes
- ↑ GOST 29322-2014
- ↑ GOST 721-77