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Control cable fault repair
Common faults in control cable lines are mechanical damage, insulation damage, insulation moisture, insulation aging deterioration, overvoltage, cable overheating faults, etc. When the above-mentioned fault occurs on the line, the power supply of the faulty cable should be cut off, the fault point should be found, the fault should be inspected and analyzed, and then repaired and tested. The cut-off can be resumed after the fault is eliminated.
Control cable main electrical performance
1. DC resistance: 20 ° C, 0.4 mm copper wire, less than or equal to 148 Ω / km, 0.5 mm copper wire, less than or equal to 95 Ω / km.
2. Insulation electrical strength: 1min between conductors 1kv does not breakdown conductor and shield 1min 3kv does not breakdown
3. Insulation resistance: Each core wire is grounded with the other cores, the control cable is greater than 10000 MΩ.km, and the HYAT cable is greater than 3000 MΩ.km.
4. Working capacitance: average 52±2nF/km
5. Far-end crosstalk defense: The average power of the specified combination is greater than 69dB/km at 150kHZ.
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