Abstract
Introduction. For the sake of early detection of potential combustion it’s expedient to apply methods, which utilize the analysis of curvature within indirect physical parameters of the area, such as aerosol and gaseous combustion products, represented by aero dispersion systems. Problem formulation. Aero dispersion system can never be sustainable, reason being there are air mass transfer in progress, dispersion and condensation processes, vortex flows occur, particle coagulation takes place, sedimentation under the weight of gravity, evaporation and etc. Materials and methods. Electric induction method of monitoring the parameters of aero dispersion systems implemented in the IP 216-M5 detector, allow for continuous analysis of changes within a wide spectrum of aerosol particles and possess higher sensitivity comparing to other sensor types. The choice of materials was based on the fact, that insulation of electrotechnical materials may be subject to overheat because the increase in the electrical load current flowing within cable products through the conductors due to the emergency state of electrical equipment. Equipment used and appliances. The heating temperature was controlled using a multimeter with a thermocouple, in the temperature-measuring mode in increments of one degree. The electrostatic induction fire detector IP 216-M5, fixes the beginning of the process of thermal decomposition. The decomposition temperature of the test material is determined by the data of a thermocouple, the sensitive element of which is in contact with the heated surface of the solder bath. Conclusion. It was experimentally proved that the electrostatic induction method for controlling aerosol systems makes it possible to detect aerosol products of thermal decomposition in different materials with their lower concentration of less than 0.1 mg/m 3 10-20 minutes before ignition of the insulation within an electric cable. The relationship between the auto-ignition temperature and the initial temperature of the thermal decomposition of the insulating sheath of electrical cables has been proven - this temperature gap is 200 °C.
Highlights
12 Ïîëèïðîïèëåí PolypropyleneÅñëè ïðîäîëæàåòñÿ ðîñò ìàññîâîé êîíöåíòðàöèè àýðîçîëÿ è êîãäà îíà äîñòèãàåò íå ìåíåå 3 ôîíîâûõ çíà÷åíèé â òå÷åíèå íå ìåíåå 5 ñ, èçâåùàòåëü ñðàáàòûâàåò ïî âòîðîìó ïîðîãó (Fire), ïîäòâåðæäàÿ ïîëîæèòåëüíóþ äèíàìèêó ðîñòà òåðìè÷åñêîãî ðàçëîæåíèÿ èñïûòóåìîãî îáðàçöà
For the sake of early detection of potential combustion it’s expedient to apply methods, which utilize the analysis of curvature within indirect physical parameters of the area, such as aerosol and gaseous combustion products, represented by aero dispersion systems.Problem formulation
The heating temperature was controlled using a multimeter with a thermocouple, in the temperature-measuring mode in increments of one degree
Summary
Åñëè ïðîäîëæàåòñÿ ðîñò ìàññîâîé êîíöåíòðàöèè àýðîçîëÿ è êîãäà îíà äîñòèãàåò íå ìåíåå 3 ôîíîâûõ çíà÷åíèé â òå÷åíèå íå ìåíåå 5 ñ, èçâåùàòåëü ñðàáàòûâàåò ïî âòîðîìó ïîðîãó (Fire), ïîäòâåðæäàÿ ïîëîæèòåëüíóþ äèíàìèêó ðîñòà òåðìè÷åñêîãî ðàçëîæåíèÿ èñïûòóåìîãî îáðàçöà. 5, ïðèõîäèì ê ñëåäóþùåìó çàêëþ÷åíèþ: ïðàêòè÷åñêè ó âñåõ ìàòåðèàëîâ ðàçíèöà ìåæäó òåìïåðàòóðîé ñàìîâîñïëàìåíåíèÿ è íà÷àëüíîé òåìïåðàòóðîé òåðìè÷åñêîãî ðàçëîæåíèÿ ïðåâûøàåò 200 °Ñ, à çíà÷èò, îáíàðóæåíèå ïîòåíöèàëüíîãî î÷àãà ïîæàðà âîçìîæíî çàäîëãî äî ïîÿâëåíèÿ îòêðûòîãî ïëàìåíè. Òåìïåðàòóðû íà÷àëà òåðìè÷åñêîãî ðàçëîæåíèÿ êàáåëåé, ñîïðîâîæäàþùåãîñÿ âûäåëåíèåì àýðîçîëÿ tò.ð, ïðèâåäåíû â òàáë. Òåìïåðàòóðû íà÷àëà òåðìè÷åñêîãî ðàçëîæåíèÿ êàáåëåé, ñîïðîâîæäàþùåãîñÿ âûäåëåíèåì àýðîçîëÿ. 24 Èçîëÿöèÿ ïðîâîäíèêà Parlans/ftrcat 5EZHíã(À)-FRHF 4 ́2 ́0,57 Conductor insulation Parlans/ftrcat 5EZHng(À)-FRHF 4 ́2 ́0.57. 27 Âíåøíÿÿ îáîëî÷êà Parlans/ftrcat 5EZHíã(À)-FRHF 4 ́2 ́0,57 Outer shell Parlans/ftrcat 5EZHng(À)-FRHF 4 ́2 ́0.57. Öåëûé ðÿä íàèìåíîâàíèé ýëåêòðîòåõíè÷åñêèõ ìàòåðèàëîâ è êàáåëüíîé ïðîäóêöèè èìååò íàñòîëüêî íèçêèå íà÷àëüíûå òåìïåðàòóðû òåðìè÷åñêîãî ðàçëîæåíèÿ, ÷òî â ðÿäå ñëó÷àåâ èõ èñïîëüçîâàíèå äîëæíî íîñèòü îãðàíè÷åííûé õàðàêòåð. À. Ýëåêòðîèíäóêöèîííûé ìåòîä êîíòðîëÿ ïàðàìåòðîâ àýðîäèñïåðñíîé ñèñòåìû è ðàííåãî îáíàðóæåíèÿ òåðìè÷åñêîãî ðàçëîæåíèÿ êàáåëüíîé ïðîäóêöèè è äðóãèõ ìàòåðèàëîâ // Ïîæàðîâçðûâîáåçîïàñíîñòü / Fire and Explosion Safety.
Published Version (Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have