The compact explosion-proof station is designed to control the switching on and off of three-phase asynchronous electric motors with a squirrel-cage rotor, operated in three-phase AC networks with an isolated transformer neutral, as well as to protect outgoing power circuits from short-circuit currents, overload and earth leakage, installed in underground workings, dangerous in terms of gas (methane) or dust.
The station can be operated both independently and as part of the substation KTPVR 1250/6-1.2 “transwitch” as a low voltage switchgear (RUNN).
The station provides load distribution of 1140 V through four power supply lines, switched by disconnectors, along six power outlets, which are switched by vacuum contactors, to connect downhole machines: tunneling machine, self-propelled car, slot-cutting or loading machine, reloader, ventilation unit. As well as two 127 V outlets for connecting lighting and a mining or vulcanizer drill.
| Parameter name | Parameter value |
|---|---|
| Rated voltage, V | 1140 |
| AC frequency, Hz | 50 |
| Number of power lines switched by disconnectors | 4 |
| Number of power outlets switched by power contactors | 6 |
| Maximum current on taps, A, | |
| – tap №1 | 600 |
| – tap №2-5 | 200 |
| – tap №6 | 80 |
| Overcurrent protection setting range, n·In | 3-12 |
| Setting range In for current overload protection, A | 6,3-750 |
| Response time of current protection against overload 6 In, sec, no more | 5 |
| Controlled value of insulation resistance in the mode of general network protection against current leakage to earth, kOhm per phase, not less than | 60 |
| Controlled value of insulation resistance in the mode of preventive control and blocking, kOhm, not less than | 100 |
| Controlled resistance value of the grounding circuit, Ohm | 50 |
| Type of power contactors | vacuum |
| Mechanical wear resistance of power contacts, cycles, not less than | 1х106 |
| Mechanical wear resistance of disconnectors, cycles, not less than | 5000 |
| Overall dimensions, mm | 2045х846,5х1059 |
| Station weight, kg, no more | 1450 |
| Level and type of explosion protection | IP54 |
| Level and type of explosion protection | РВ Ex db [ib Mb] I Mb |