Control station type SU-RN is designed for the remote control (turn on and off), over-current protection and short circuit of asynchronous drives with squirrel-cage rotor (from 1 to 10 pcs) and outgoing connections in mining electrical networks with isolated neutral transformer.
Control station is available in the unit normal version RN-2.
Main types of the stations depending on the controlled equipment:
- compact station with automatic switch and lighting transformer for the control of shearer, potash miner and cooling installation;
- compact station with automatic drive for the control of the shearer and cooling installation;
- compact station for the control of shearer and gate-conveyor with transformer (Р=40kVA, U=1140/660V);
- compact station for the control of the shearer and gate-conveyor;
- compact station for the control of stowing complexes.
Distinctive feature of the control stations type SU-RN is the circuitry that provides:
- enabling and disabling of power contactors according to a predetermined algorithm;
- enabling and disabling of power contactors without supplying of voltage power circuit (testing);
- ability to connect remote controls;
- intrinsically safe inputs for external control;
- intrinsically safe outputs for the issue of the status of power contactors.
Station’s circuitry except the controlling functions provides:
- protection against short-circuit currents of outgoing power circuits;
- protection against overcurrent of outgoing power circuits;
- protection against impermissible heating of the connected equipment;
- protection from the break and fault of the circuits of remote control;
- protection against self-switch at increasing of the voltage up to 150 % of nominal;
- protection against break, fault or increasing of resistance above the permissible level of the ground of outgoing connections;
- lock which prevents switch of the lead-out at damage or reducing of isolation of outgoing circuits relative to the ground below the permissible level;
- protection against electrical leakage in the internal power supply circuits 42 V and 220 V;
- protection against leakage of current in the outgoing connections and "5-meter" section of the supply line;
- zero protection;
- indication of supply voltage;
- indication of protection operation;
- indication of switch of the outgoings;
- verification of protection action.
In the off-circuits 127 V after the lighting transformer except control functions are also provided:
- protection against current leakage;
- lock, which prevents the inclusion of outgoings at damage or reduce of isolation of outgoing circuits relative the ground below the permissible level;
- protection against open circuit, short or resistance increase above the permissible level of the grounding circuit of outgoing connections;
- protection against short-circuit currents of outgoing connections;
- protection against over current of outgoing circuits.
- underground workings of mines, including salt, ventilated with fresh air stream through the generally-mining depression, in which "Safety rules at underground mining of the potash deposits of the Republic of Belarus" is allowed to use the electrical equipment in mine normal performance;
- conditions and category of usage according to GOST 15150-69;
- ambient temperature, 0C - from -5 to +35 ;
- relative humidity at ambient temperature (25 ± 2) 0 C, % - (98 ± 2);
- atmospheric pressure, kPa - (99,75 ± 13,3);
- dustiness of the air, no more mg/m2 - 1500 ;
- vibration, no more Hz - 25 ;
- acceleration vibration, no more m/s2 - 10;
- group of exploitation conditions at the part of the influence of mechanical factors according the GOST17516.1-90 - M18;
- no jolts and bumps;
- working position - vertical, is permitted a deviation of the working position not more than 150 in any direction;
- permissible mains of voltage of supplying network from 85 to 110% of the nominal value.