INCREASING NOISE IMMUNITY OF CABLES FOR FIRE PROTECTION SYSTEMS

• Дата: 2020
• Автори: Bezprozvannych, G. V., Pushkar, O. A.
• Формат: Стаття
• Мова: English; Ukrainian
• Опубліковано: National Technical University "Kharkiv Polytechnic Institute" and State Institution “Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine” 2020
• Теми: системи протипожежного захисту; електромагнітний вплив; перехідне загасання на ближньому кінці; кручені пари; неекранований і екранований кабелі; коефіцієнт загасання; 621.319; fire protection systems; electromagnetic influence; near end crosstalk; twisted pairs; unshielded and shielded cables; attenuation coefficient
• Онлайн доступ: http://eie.khpi.edu.ua/article/view/2074-272X.2020.4.07
• Назва журналу: Electrical Engineering & Electromechanics

Introduction. Technical means of fire protection systems are capable of operating at data rates from tens to hundreds of Kbit/s with components of a digital signal in the frequency spectrum up to several tens of MHz. Appropriate cable infrastructure with a high level of noise immunity is required to transmit broadband digital signals. Purpose. Substantiation of ways to increase noise immunity of cables based on twisted pairs for modern fire protection systems with the ability to transmit digital signals in the frequency spectrum up to 100 MHz. Methodology. A comparison is made of the influence of the twisting step of pairs in unshielded 4-pair and multi-pair shielded balanced cables on the parameters of electromagnetic effects. It has been experimentally shown that twisting each pair with different steps provides a higher level of noise immunity of cables based on twisted pairs. Practical value. The frequency dependencies of the near end crosstalk in 10-, 30- and 4-pair balanced cables are shown. The influence of the common shield on the attenuation coefficient of the shielded 4-pair cable is established.