Explosion-proof compact mining station SKRV-1-065-11V
The station is designed to control the start, stop, change of rotation speed, protection against short circuit currents and overload of three-phase asynchronous electric motors with a squirrel-cage rotor of a self-propelled car, powered by a three-phase AC network with isolated neutral, in mines and mines that are hazardous for gas (methane) and dust.
| Parameter name | Parameter value |
|---|---|
| Rated voltage, V | 1140 |
| AC frequency, Hz | 50 |
| Rated continuous current (max.), A | 96 |
| Voltage of intrinsically safe control circuits, V | 12 |
| Range of overcurrent protection settings, A | 6,3-750 |
| Setting range In for current overload protection, A | 10-63 |
| Overload current protection response time, 6In, max, sec | 5 |
| Controlled value of insulation resistance 1140 V, kOhm | 100 |
| Controlled thermistor resistance value, kOhm | 13 |
| Type of power contactor | Vacuum |
| Switching wear resistance of the main contacts, ON-OFF cycles: | |
| – in category AC-3 (with In. work. = In) | 3х105 |
| – in category AC-4 (with In. work. = 0.4In) | 1х105 |
| Mechanical wear resistance of main contacts, ON-OFF cycles | 1х106 |
| Mechanical wear resistance of the disconnector, ON-OFF cycles | 6300 |
| Frequency converter: | |
| – rated mains voltage, V | 1140±15% |
| – output voltage, V | 20-1140 |
| – continuous mode current, A | 50 |
| – output frequency range, Hz | 1 to 99 |
| – clock speed, kHz | from 1.2 to 3 |
| – the principle of transformation | MSI – vector |
| – permissible current overload* | 80А – maximum 70А – 1 min 60А – 6 min |
| – braking system | electric, return of energy into the circuit |
| – operating temperature, not more than ˚C | <60 |
| – liquid | cooling |
| – maximum temperature of the radiator, not more than ˚C | 60 |
| – inverter weight, kg | 17 |
| – cooling liquid | Antifreeze G12 |
| Overall dimensions of the station, mm, no more | 1500х500х900 |
| Station weight, kg, no more | 920 |
| Level and type of explosion protection | IP54 |
| Level and type of explosion protection | РВ Ex db [ib Mb] I Mb |
| *Long-term overload current capacity depends on the cooling conditions and inverter output frequency. | |