The common faults of the control cable lines are mechanical damage, insulation damage, dampness of insulation, deterioration of insulation age, overvoltage, and overheating failure of cables. When the above fault occurs on the line, the power of the faulty cable should be cut off, the fault point should be found, the fault should be checked and analyzed, and then the repair and test should be carried out. The cut should be removed and the power supply can be restored after the fault is eliminated.
Control cable main electrical performance
1. DC resistance: 20°C, 0.4mm copper wire, less than or equal to 148Ω/km, 0.5mm copper wire, less than or equal to 95Ω/km.
2. Insulation electric strength: 1min1kv between conductors does not penetrate the conductor and the shield does not breakdown for 1min3kv
3. Insulation resistance: Each core wire is grounded to the rest of the wire core, the control cable is greater than 10000MΩ.km, and the HYAT cable is greater than 3000MΩ.km.
Tianjin cat brand control cable fault maintenance 4. Working capacitance: average 52±2nF/km
5. Far-end crosstalk defense: When 150kHZ is specified, the average power of the specified combination is greater than 69dB/km.
Difference with power cable
The power cable is used to transmit and distribute the large-functional power in the main line of the power system, and the control cable directly transmits the power from the power distribution point of the power system to the power connection lines of various appliances and appliances. The rated voltage of the power cable is generally 0.6/1kV and above, and the control cable is mainly 450/750V. When power cables and control cables of the same specifications are manufactured, the insulation and sheath thickness of power cables is thicker than that of control cables.
(a) The control cables belong to the cables for electrical equipment, and the power cables are two of the five categories of cables.
(b) The standard for control cables is 9330 and the standard for power cables is GB12706
(3) The color of the insulated wire core of the control cable is generally black and white, and the low voltage of the power cable is generally a color separation.
(4) The cross-section of the control cable will generally not exceed 10 square meters. The power cable is mainly used for power transmission and generally has a large section.
Due to the reasons mentioned above, the specifications of power cables can generally be larger, up to 500 square meters (range that conventional manufacturers can produce), and there are relatively few manufacturers that can do large cross-sections, and the cross-section of control cables is generally small. Smaller, the maximum is generally not more than 10 square.
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