Locomotive cable Precautions for cable line operation
(1) Do not overload or overheat for a long time. Therefore, the monitoring of cable load current, external temperature and joint temperature should not be ignored;
(2) The cable line feeder protection shall not be put into reclosing. Most of the cable line faults are permanent faults. If the reclosing action is taken, it will inevitably expand the accident and threaten the stable operation of the power grid;
(3) After the feeder of the cable line trips, do not ignore the cable inspection. Focus on whether the cable path is excavated and whether the wires are damaged. If necessary, further inspection and judgment shall be made through tests;
(4) Special attention shall be paid during the operation inspection of directly buried cables: the ground near the cable path shall not be excavated casually; The ground near the cable path shall not scale heavy objects, corrosive substances and temporary buildings; Cable route marker posts and protection facilities shall not be moved or removed at will;
(5) The cable line must be retested before it can be put into use when it resumes operation after being stopped. The insulation resistance of cables that have been cut off for more than a week but less than a month shall be measured by shake before they are put into operation again, and shall not be reduced by 30% compared with the last test record, or withstand voltage test shall be conducted; If the power failure lasts for more than one month but less than one year, the surface voltage test must be conducted, and the test voltage can be half of the preventive test voltage; If the power failure time exceeds the test period, the preventive test must be carried out.
4、 Operation and maintenance of cable lines
The operation and maintenance of cable lines are important to do a good job in three aspects: load monitoring, cable metal sheath corrosion monitoring and insulation monitoring, to keep the cable equipment always in good condition and prevent cable accidents. The main items include: establishing cable line technical data, conducting cable line patrol inspection, cable preventive test, preventing cable damage by external force, analyzing cable fault causes, cable fault detection, wire fault repair, etc. Special contents shall be added to the cable line, such as termite trapping, manhole water sample analysis, water tree slicing inspection, live measurement and insulation monitoring.
