After the operation, the same cable between the different core, close to the laying of parallel cables between the existence of electrical interference problems, the main cause of electrical interference are:
In order to ensure that the control cable in the event of insulation breakdown, mechanical damage or fire, reduce the scope of the spread, the national standard GB50217-91 "power engineering cable design specifications" provides: dual protection of the current, voltage and DC power and trip control circuit Two sets of systems that require increased reliability should use separate control cables.
(1) due to external voltage in the core capacitance between the capacitive coupling generated under the electrostatic interference;
(2) due to the current generated by the electromagnetic induction interference. In general, when there is a high voltage, high current interference source, the electrical interference is more serious, because the same cable between the core of the smaller distance, the interference is much greater than the parallel laying of the adjacent cable. For example, a high-voltage substation split circuit breaker control circuit, three-phase combination of a cable, had occurred such an accident, by the phase of the pulse to the other phase of the trigger thyristor, caused by three-phase linkage, later changed With separate cables, no further malfunctions occur. Another example is a computer monitoring system of a power plant.
Copyright ? 2010 - 2025 zmscable.com All Rights Reserved.
