ON A LINEAR FIRE DETECTION USING COAXIAL CABLES

Abstract

Alarm systems represent a combination of the various modern engineering solutions (electrical, mechanical, hydraulic, etc.) with the primary goal to protect human lives, living and working environment and material properties. Detectors are basic and common components of these systems. There are many different kinds of detectors which usage depends on system solutions, prices and other technical properties of system application. Different types of non-typical lines can be used as detectors in alarm systems, such as coaxial cables or special constructed electrical lines. The change of some parameters of cables, such as capacity, impedance, resistance or similar, according to temperature, pressure, torsion or other disturbances, can be used for detection of intruder or fire. This work presents experimental results obtained on three different types of coaxial cables: RF 75-3-1, RF 75-4-5 and RF 75-7-9 in order to show changes of capacity as a consequence of heating due to growth of surrounding temperature, and consequently, possible application of cables as fire detector. Before an experiment, a simulation of fire in laboratory 113 in Electrotechnical school Nikola Tesla in Niš was made in FDS (Fire dynamic simulator) software to show the possible spreading of fire, and consequently, to find optimal location for coaxial cables as fire detectors.

Keywords

Dates

  • Submission Date2013-02-11
  • Revision Date2013-07-15
  • Acceptance Date2013-07-16
  • Online Date2013-08-04

DOI Reference

10.2298/TSCI130211102J

References

  1. Blagojević, M., Alarm systems, Faculty of occupational safety, Niš, Serbia,2011
  2. Popović, V., Telecomunication and electronics measuring, Arhitecture book, Belgrade, Serbia, 1967
  3. ***, NFPA 72, National Fire Alarm Code, 1999 Edition, NFPA, 1999
  4. ***, EN-54-5, Fire detection and fire alarm systems-Part 5: Heat detectors, Point detectors, 1997
  5. Fire Dinamic Simulator, National Institute of Standards and Technology, USA, 2010
  6. Group of authors, Chemistry and technology handbook, Publicher working organisation Rad, Belgrade, Serbia, 1987
  7. Radošević, N., Chemists and technologist handbook, Technical book, Belgrade, Serbia, 1968
  8. Holding cable industry a. d. Jagodina, Cable catalog, 2009
  9. Stanković, D., Physics technical measurements-Sensors, Scientific book, Belgrade, Serbia,1997
  10. Đukić, P., Sensors and measurement converters, Faculty in Split- Compartment of vocational studies, Split, Croatia, 2004
  11. Popović, M., Electrometerology laboratory practical book, Higher Electrotechnical school, Belgrade, Serbia, 2001
  12. Jevtić, R., Blagojević, M., Possible appliance of impulse reflectometry on fire and burglary protection systems based on non-typical electrical lines, 56th ETRAN CONFERENCE, Zlatibor, Serbia, 2012
  13. Jevtić, R., Blagojević, M., Linear fire detection with distance determination using coaxial cables, 19th Telecommunications Forum TELFOR 2011, Belgrade, Serbia, 2011
  14. Blagojević M., Pešić D., A new curve for temperature-time relationship in compartment fire, Thermal Science, 15 (2011), Issue 2, pp. 339-352
  15. Cumming, N., Security- a guide to security system design and equipment selection and installation, Butterworth-Heinemann, 1994
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