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Factors affecting the AC resistance of overhead wiresAc resistance of the wire is a necessary for computational load flow parameters. Ac resistance is under the condition of the alternating current direction, due to the effect of the magnetic field, the influence of skin effect, and proximity effect, make resistance increases. Ac resistance o...
The test method of bare wire tension1. Sample preparation1.1 From the appearance inspection qualified bare cable sample to at least 1 m length. Then according to the required length of intercepting specimens of not less than 3.1.2 The effective length. Nominal cross-section of 50 mm and below, not less than 0.5 m; Nominal cross section for more than...
Types of insulation for communication cablesThe high-frequency cable insulation structure, in addition to the old paper yarn tape insulation structure, has been producing foam polyethylene, polyethylene insulation rope polyethylene pipe insulation, fish bubble insulation, polystyrene insulation rope, etc.The largest foam polyethylene ins...
Similarities and differences between the screening process and the transfer processElectromagnetic energy along the shield effect process is similar to the process of electromagnetic energy transmission along the line. Shielding is equivalent to the process of transmission attenuation in the process of natural attenuation, shielding th...
Transmission parameters of communication cablesCommunication cable transmission parameters include:
1. The effective resistance: the effective resistance of the cable circuit including dc resistance and the additional resistance through alternating current (ac).
2. Inductance: in a communication cable circuit, the ratio of the flu...
Features of rubber sheathingRubber and the plastic sheath for rubber cable is the most significant characteristic of soft light Jane is inexpensive but has specific permeability.
Rubber and plastic sheaths according to the materials used in general can be divided into rubber sheaths and plastic sheaths.
1. The characteristics of the rubb...
Measures for flame retardant cables1. Round cable with fire-resistant insulation materials, when the cable is around the fire, bind up the cable isolation can be fire-resistant insulation materials and fire from burning. If the cable is on fire, because of the lack of oxygen in the body can be set fire self-extinguishing, to avoid fire spreading to pack ou...
The way to prevent cable fires1. Ensure the quality of construction, especially the cable head production quality must strictly conform to the specified requirements.
2. Strengthen the cable operation monitoring, and avoid overload operation.
3. To test the cable on schedule, and found abnormal should be handled in time.
4. Cable conduit to keep...
The use of a power cable shieldShield to uniform conductive wire core and electric insulation, 6 kV and above in high voltage power cables have commonly conductor shielding layer and the insulating shield, part of the low voltage cable shielding layer. The shielding layer has two kinds of semiconduction shielding and metal shielding.1. Conduct...
