In order to ensure insulation breakdown of the cable, mechanical breakdown or ignition, in order to reduce the scope of the spread, dual protection of the current, voltage and DC power supply and trip control circuit, etc., need to strengthen the reliability of the system should Use separate control cables.
After the control cable is put into use, there is a possibility of electrical interference between different cores of the same cable. There are many causes of electrical disturbances:
Due to the electrostatic disturbance caused by the capacitive coupling of the cable on the external cable, due to the electromagnetic induction disturbance, overall, to which voltage signal is adjacent, the high-current disturbance source is disturbed when the voltage is high. Disturbance is more serious. Since the distance between the cores of the same cable is small, the degree of disturbance is much greater than that of the parallel laying of the adjacent cable. The control function of the circuit breaker when a high-voltage cable substation is operated by phase separation. In the future, separate cables can be used instead of accidental touches, leading to accidents.
Tests have shown that when there is a spare slender grounding in the control cable, the blessing value of the disturbance voltage can be reduced, and the implementation is convenient. The increase in the cost of the cable is relatively small, and the electrical disturbance sometimes has serious consequences. Reminder of the use of a control cable, where weak signal cable signal control loop severe signal disturbance. The same control cable should not be used for low cable signals, loops for leveling signals, and various control loops for the operation of AC circuit breakers. However, for a control cable, the return of a weak circuit does not belong to every time. When the same control cable is laid, it may form a variety of ring-shaped arrangements. Under the similar power supply magnet wire, the value of the induced potential will occur, which may have a greater impact on the parameter disturbance of the weak circuit. Therefore, The return cable still uses a control cable.
Metal shielding is an important measure to reduce and prevent electrical disturbances, including total shielding of the core, sub-shielding and double-layer total shielding, control cable selection, should be included in the comprehensive suppression of disturbances in accordance with the possible electrical disturbances The measures to meet the requirements of falling overvoltage, the higher the requirement for preventing disturbance, the greater the corresponding investment. When using steel tape armor, when the braiding of the steel wire is always shielded, the price of the cable will be Relatively high. The control cable in the strong electric circuit, because its own signal is relatively strong, so for the ultra-high voltage distribution device or the high-voltage cable tightly parallel, can not use the metal shielded control cable. In order to prevent electrical disturbances, misinterpretation of the signal circuit of the cable may occur, resulting in breakdown of the insulation of the cable. A weak cable can be laid in a steel pipe if it can be pulled away from the cable by a sufficient distance, which may cause the external electrical disturbance to drop to an acceptable level.
Under the eaves, the cable is only exposed to direct sunlight, or at very high temperatures. Standard LAN cables can be used to remind the use of pipes, external walls, direct sunlight exposure, and the laying of walls. The damage, in the pipeline, if it is inside the pipeline, pay attention to the damage of the plastic pipeline and the thermal conduction of the metal, mechanical damage, and the repair of the optical cable is very expensive. At each intermittent point, at least two connections need to be considered.
Above KeXun cable factory for everyone how to install the cable to ensure the effective operation of the cable, we now know it!
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