Explosion-proof compact mining station SKRV-18, -19
The station is designed to control the start, stop, change of rotation speed, protection against short circuit currents and overload of three-speed 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 | SKRV-18 | SKRV-19 |
|---|---|---|
| Rated voltage, V | 1140 | 660 |
| AC frequency, Hz | 50 | |
| Rated continuous current (max.), A | 85 | 147 |
| Power supply voltage of a portable power tool, V | 220 | 127 |
| Rated continuous current in the circuit 220/127V (max.), A | 10 | 17 |
| Power of the connected electric tool, kW, no more | 4 | |
| 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 | |
| Response time of current protection against overload 6In, no more than, sec | 5 | |
| Controlled value of insulation resistance 1140 V, kOhm | 100 | 30 |
| Controlled thermistor resistance value (temperature protection), 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) | 1,6х106 | |
| – in category AC-4 (with In. work. = 0.4In) | 5х104 | |
| Mechanical wear resistance of main contacts, ON-OFF cycles | 1,6х106 | |
| mechanical resistance of the disconnector, ON-OFF cycles | 6300 | |
| A step-down transformer: | ||
| – rated voltage of the primary winding, V | 1140 | |
| – rated voltage of the secondary winding, V | 127 | |
| – rated current of the primary winding, A | 2,03 | |
| – rated current of the secondary winding, A | 10,1 | |
| Overall dimensions, mm, no more | 1500х519х890 | |
| Weight, kg, no more | 890 | |
| Level and type of explosion protection | IP54 | |
| Level and type of explosion protection | РВ Ex db [ib Mb] I Mb | |