Basic Overview And Main Types Of Control Cables

1. Overview of Control Cable Wire

Cables that connect from the control center to each system to transmit signals or control operational functions are collectively referred to as control cables. The early functions of the control cable are relatively simple, including indicator light display, instrument indication, operation of relays and switchgear, alarm interlocking system, etc. In recent years, due to the wide application of weak current and computer networks, new functions and higher requirements have been put forward for the selection and application of control cables. This paper discusses some new problems in the selection and use of control cables in recent years for research reference.

Second, the main series of varieties of control cables

The main products of today's control cables are: PVC insulated control cables, natural-styrene-butadiene rubber insulated control cables and polyethylene insulated control cables. In addition, there are cross-linked polyethylene insulation and ethylene-propylene rubber insulation products. The oil-impregnated paper-insulated lead-clad control cables produced in the early years have been eliminated.

The rated voltage of the control cable is represented by U0/U. =

The wire core of the control cable is copper core, the nominal cross section is 2.5mm² and below, 2~61 cores; 4~6mm², 2~14 cores; 10mm², 2~10 cores. The working temperature of the control cable: rubber insulation is 65°C, and PVC insulation is 70°C and 105°C. The control cables used in the computer system generally use PVC, polyethylene, cross-linked polyethylene, and fluoroplastic insulation products.

Performance characteristics

1. DC resistance: 20℃, 0.4mm copper wire, less than or equal to 148Ω/km, 0.5mm copper wire, less than or equal to 95Ω/km.

2. Dielectric strength: 1min 1kv between conductors without breakdown, conductor and shield 1min 3kv without breakdown

3. Insulation resistance: each core wire is grounded with other cores, the control cable is greater than 10000MΩ.km, and the HYAT cable is greater than 3000MΩ.km.

4. Working capacitance: average value 52±2nF/km

5. Far-end crosstalk defense: The average power of the specified combination at 150kHZ is greater than 69dB/km.