Setting-out Construction Method of Bare Wire for Electric Power
NEW

2013-01-16

Setting-out Construction Method of Bare Wire for Electric Power

This construction method is suitable for overhead lines with small cross-sectional area and not too long line segments (line segments are divided according to tension segments). During the setting-out construction, the use of manpower directly on the ground to drag the line, can be without traction equipment and a large number of traction wire rope, the method is simple. The disadvantage is that it takes a lot of labor and will damage large areas of crops. The arrangement of labor force is as follows: the average weight per person on the flat ground is 300N, and that on the mountain is 200N. According to the length of the guide and ground wires or the length of the tension section, several wires can be dragged and dropped at the same time at the beginning. In the later stage, due to the increase of length and weight, the first part can be suspended step by step, and the combined and concentrated labor force can be dragged and dropped successively.

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Tightening method of bare wire for electric power
NEW

2013-01-17

Tightening method of bare wire for electric power

The high-altitude tight line method is mainly used in the tight line construction of distribution lines with small cross-sectional area and small tight line tension. It has the advantages of simple construction method, small operation site and few construction machines. However, most of the processes must be completed at high altitude, increasing the workload of high-altitude operations. When tightening the line, the remaining line should be tightened first, usually with manpower or traction equipment to operate directly on the ground. When the overhead line in front is separated from the ground, the wire tightener can be set at a certain distance (estimated wire tightening length) in front of the tension operating lever tower, the wire tightener can be pulled by the traction equipment, and the wire can be tightened by the pulley at the wire hanging place. When the overhead line is tightened close to the required sag value, slow down the traction speed. When the sag observer in front notifies that the required sag value has been reached, stop towing immediately. When the overhead line stops jumping and the sag does not change, mark the line hanging point hole on the operating lever tower. After marking, the construction personnel on the tower will install the lead and ground wire with strain clamp at high altitude, and hang the lead and ground wire on the tower. This method of operation because the overhead line does not need to be panasonic landing, so called a tight line method. If the guide and ground wire are loosened to the ground after high-altitude marking, the ground operator shall install the strain clamp according to the mark, assemble the insulator string at the same time, tighten the wire again and hang the wire. This method is called secondary lifting and tightening method. The advantage is to reduce the amount of high-altitude work. It is suitable for wire cross-section and tight line tension line, especially the crimping tension clamp, high-altitude construction is quite inconvenient, so most of the use of this method.

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Key points of power cable crimping process-preparation stage
NEW

2013-01-21

Key points of power cable crimping process-preparation stage

Stripping off the insulation at the end of the connected wire and cable, the length of stripping off the insulation, unless otherwise specified in the design, is generally the length from the end of the connecting pipe to the cut-off pit or oil blocking grid plus 5~10mm; The length of stripping off the insulation of the terminal (wire nose) is the length of the conductor that can be inserted into the cylinder part of the terminal plus 5~10mm.

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Power cable crimping process-quality inspection after crimping
NEW

2013-01-22

Power cable crimping process-quality inspection after crimping

1) The surface of the crimping part should be smooth without cracks and burrs. There shall be no tip at all edges. 2) The depth of the pit shall be consistent with the height of the press-in part of the male die, and the bottom of the pit shall be flat and undamaged. 3) The electrical and mechanical properties of the crimp joint shall comply with GB/T9327-1988 Test Method for Compression and Mechanical Connection of Cable Conductor.

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Six major causes of wire and cable problems
NEW

2013-01-24

Six major causes of wire and cable problems

1, insulation aging deterioration of wire and cable insulation to be accompanied by electrical action brought about by the role of thermal, chemical and mechanical, so that the insulation medium physical and chemical changes, so that the insulation capacity of the medium decreased. Insulation is damp, the insulation is damp due to the upper and lower sealing of the structure or poor installation quality of the intermediate joint or terminal head, and defects such as sand holes or cracks are left when manufacturing the cable package lead, which will also make the cable damp. There are many reasons for cable overheating. The internal cause is the cable insulation internal air gap free caused by local heating, so that the insulation carbonization. External causes are installed in cable-dense areas, cable tunnels, etc.

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Power cable crimping process-crimping
NEW

2013-01-22

Power cable crimping process-crimping

1) The position of each indentation shall be selected according to the position and regulations marked on the connecting pipe or terminal cylinder. The axial center line of the indentation pit for local crimping or the center line of the opposite side of the inscribed circle in the hexagonal integral crimping shall be on the same straight line. The degree of crimping shall be subject to the contact of the lower die or the effective stroke specified by the press clamp. After pressing an indentation, it should stay for 10~15S. The pressure was then removed. The operation method of the press clamp shall be carried out according to the procedures specified in the press clamp instructions of the press clamp manufacturer. 2) After pressing, use a fine-tooth file to file the water chestnut tilted due to pressure at the edge of the pit and the end of the connecting pipe, and polish it with sandpaper, and then use cotton dipped in gasoline.

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International Business:0871-67334199
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Company Headquarters: 11th Floor, Tower 1, Dongju Jiaxin Business Center, Guandu District, Kunming City, Yunnan Province
Production base: Xiaoshao and other areas of Qidian Industrial Park, Chenggong District, Kunming City, Yunnan Province

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