The substation is designed to convert high-voltage alternating current into low voltage for power supply with three-phase current to power receivers installed in underground workings that are hazardous for gas (methane) or dust, as well as to provide protection against leakage currents and overcurrent protection of low voltage line taps.
The type of explosion protection “intrinsically safe electrical circuit” for external control and protection circuits is provided with level ib according to GOST 3 1610.11-2014.
The substation has the types of explosion protection “explosion-proof enclosure” in accordance with GOST IEC 60079-1-2013, which withstands the pressure of an explosion of a methane-air mixture inside, excluding the transfer of an explosion to the environment and “intrinsically safe electrical circuit” in accordance with GOST 31610.11-2014, and also meets the general requirements for explosion-proof electrical equipment according to GOST 31610.0-2014.
| Parameter name | Parameter value | Tolerances | |
|---|---|---|---|
| Rated power of the substation, kVA | 1800 | – | |
| Rated frequency, Hz | 50 | – | |
| Rated primary voltage, kV | 6 | 10 | ±15% |
| Rated secondary voltage, V | 3,3 | ±5% | |
| Rated secondary current, A, no more | 315 | – | |
| Circuit and winding connection group | Y/Y-0 | – | |
| Method and range of voltage regulation | off-load tap ±35% | – | |
| Insulation class according to the heat resistance of the transformer | Н | – | |
| Mechanical life of the disconnector, number of on-off cycles | 2000 | – | |
| Insulation resistance value for symmetrical three-phase leakage, kOhm per phase, not less than | 80 | – | |
| Controlled value of insulation resistance of the tap before voltage supply, kOhm per phase, not less, kOhm | 120 | – | |
| Overall dimensions, mm | 4000х1200х1600 | ||
| Total weight, kg, no more | 12 000 | – | |
| Level and type of explosion protection | IP54 | ||
| Level and type of explosion protection | РВ Ех db [ib Mb] I Mb | ||