Overhead cable faults and preventive measures

1. Overhead Cable Precaution

(1) In the distribution line, because the overhead cable is horizontally, and a smaller distance between the lines, if the wires within the same span sag are not the same as when the wind is a strong swing of each wire is not the same, leading to the collision caused white wire short circuits, so the construction must be strict, attention wire tension, three-phase conductor sag equal, and a predetermined standard range. When line inspection, found the above problems, it is time to arrange treatment.

(2) The wind cut off a branch falling on the line, or a guideline throwing metal objects can also cause phase short circuit wire, even broken. In addition, an ultra-high crane car through the line or in the line below the bottom of the job may cause a short circuit or line break accident. Therefore, at the intersection, cross the line spacing should leave some distance.

(3) Due to the long lead eroded water, air, and harmful gases, oxidation damage, steel wire and lightning line most likely to rust, found severe corrosion in the tour leader, should be promptly replaced.

2. Insulator's Precaution

(1) Porcelain insulators on the line in the air due to the impact of harmful ingredients, so filthy porcelain part, encountered wet weather, filthy layer absorbs moisture, the conductive performance enhancement, not only increasing the power consumption, and easy to cause flashover accident.

(2) Line of incorrect assembly or failure of the porcelain insulator due to aging, the occurrence of flashover breakdown in the power frequency voltage under the action. When this inspection found traces of the porcelain insulator flashover should be promptly replaced, and the new porcelain insulators pressure test must be replaced.

(3) Ceramic insulated in part by external damage, cracking or damaged, or destroyed chunks of porcelain from the edge of the skirt to the top of both cracks and should be replaced, otherwise it will cause the insulation to reduce the occurrence of flashover accident.

3. Precautions for Rod Fittings

(1) Due to the impact of soil and water, wood decay, often results in accidents lever down, so when using wood, wood-roots anti-corrosion measures should be such as asphalt coating or tie plus pile.

(2) Cement pole subjected to external collision accident levers down, such as a car or a tractor collision.

(3) Lead to uneven force, making the tower tilted, you should adjust the fastening pole of the cable or line.

(4) Place the wire vibration, screw fittings, and easy to fall off due to vibration of the accident, inspection and cleaning should therefore be carefully examined in gold with the various components of the contact are good.