Maoming old cable recycling fast door
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Why is a return wire laid parallel to the cable installed in the grounding of one end of the single core cable sheath? In the cable line with one end of the metal sheath grounded, to ensure that the induced voltage in the protective sleeve does not exceed the allowable value, install a conductor laid parallel to the cable line, and the two ends of the conductor are grounded. This conductor is called the return wire. When a single-phase grounding fault occurs, the grounding short-circuit current can flow back to the center point through the return line. Because the magnetic flux generated by the grounding current through the return line offsets the magnetic flux generated by the grounding current of part of the cable conductor, the induced voltage of the sheath during the short-circuit fault can be achieved.
What are the requirements in the measurement of positive sequence impedance of cable lines? The AC resistance of cable conductors and the sum of the three same inductive reactances of cables are called positive sequence impedance. The positive sequence impedance of the cable line can generally be directly measured on the cable reel. Generally, a lower voltage is used during the measurement. Therefore, a step-down transformer is required for step-down. The step-down transformer is star connected with a capacity of more than 10kVA. It has a wide voltage regulation range. The AC power supply should be compared during the measurement to ensure that the current meets the specified requirements during the measurement, The actual reading value of the voltmeter is the voltage at the cable end. The test current is close to the long-term allowable current carrying capacity of the cable. When measuring the value of each meter, turn on the current and read the values of the three meters at the same time.
The commonly used power cables for cable selection include oil immersed cables, polychlorinated insulated cables, cross-linked poly cables, etc. They are also extended to different types of special cables according to different application occasions. At present, with the continuous improvement of production technology and production process, the cross-linked polymer cable has become a widely used cable product. When selecting the cable, it should be selected according to the different environment and conditions of use, combined with the specific situation, and try to reduce the crossing of various pipeline side railways, highways and communication cables; If direct burial and shallow trench laying are adopted, steel armored cables shall be considered.
Maoming old cable recycling fast door
