Intrinsically safe mining safety Couplers KTJ152
The KTJ152 mining safety coupler has the following uses:
1. It provides reliable electrical connections between various electrical equipment used in mines, ensuring stable signal and power transmission.
2. It effectively isolates dangerous high-energy sources, preventing them from entering intrinsically safe circuits and ensuring the safe operation of intrinsically safe equipment underground.
3. It serves as a signal conversion interface, adapting and converting models of different types and voltage levels to meet the signal transmission requirements between mining equipment.
4. In underground coal mine communication systems, it enhances signal strength, extends signal transmission distance, and ensures smooth communication.
5. It filters signals entering intrinsically safe circuits, removing interference and improving signal quality.
6. It protects intrinsically safe mining equipment from damage caused by transient over-voltage and over-current surges.
Operating Environmental Conditions
1 Implementation standard number
MT 402-1995 General Technical Specifications and Enterprise Standard for Safety Couplers for Coal Mine Production Dispatch Telephones Q/330110 SPC D004-2021.
2 Explosion-Proof Type
Intrinsically safe output for mining use. Explosion-proof marking: [Ex ib Mb] I.
3 Specifications
4-way passive coupler.
4 Connection Method
External wiring is plugged and simple.
a) Ambient temperature: 0°C to +40°C;
b) Average relative humidity: ≤90% (at +25°C);
c) Atmospheric pressure: 80kPa to 106kPa;
d) Location free from significant vibration and shock;
e) Workplace: Ground-level indoors.
1 Connection Distance to the Dispatcher
The coupler is installed directly in the dispatcher cabinet.
4.2 Transmission Loss
The transmission loss of each coupler must not exceed 2dB.
4.3 Crosstalk Loss
The crosstalk loss between any two couplers must not be less than 70dB.
4.4 Input and Output Signals
4.4.1 Non-intrinsically safe input parameters
a) Maximum DC input voltage: ≤60V;
b) Maximum DC input current: ≤60mA;
c) Maximum ringing current input voltage: ≤90V;
d) Maximum ringing current input current: ≤90mA.
4.4.2 Intrinsically safe output parameters
a) Maximum DC open-circuit voltage: ≤60V;
b) Maximum DC short-circuit current: ≤34mA;
c) Maximum ringing current open-circuit voltage: ≤60V;
d) Maximum ringing current short-circuit current: ≤38mA.
The mine communication system consists of KTJ152 mine safety coupler, an intrinsically safe automatic telephone, and a conventional ground-based exchange or digital program-controlled telephone exchange, as shown in following diagram.
