Carbonization Characteristics of Phenolic Resin Deteriorated by Tracking

트래킹에 의해 열화된 페놀수지의 탄화 특성

  • 송길목 (ESRI(전기안전연구원) 재해연구팀) ;
  • 최충석 (ESRI(전기안전연구원) 재해연구팀) ;
  • 노영수 (숭실대 공대 전기공학과) ;
  • 곽희로 (숭실대 공대 전기공학과)
  • Published : 2004.01.01


This paper describes the carbonization characteristics of a phenolic resin deteriorated by tracking under the environment of a fire. In the experiment, a liquids droplet of 1[%] NaCl was dripped on the phenolic resin to cause a tracking with 110[V], 220[V] voltages applied. It can be addressed from the experimental results that when an insulator is carbonized by an external fire, its structure is amorphous. If an insulator is carbonized by electrical cause, on the other hand, its structure would be crystalline. In order to observe the surface change of the phenolic resin, the tracking process was analyzed by using SEM. In the case that the materials are carbonized under heat or fire, the exothermic peak appears around 500[$^{\circ}C$]. This is one of the important factors to determine the cause of fires. As a result of DTA, the exothermic peaks of an untreated sample showed at 333.4[$^{\circ}C$], 495.7[$^{\circ}C$] but those of a sample deteriorated by tracking appeared at 430.6[$^{\circ}C$], 457.6[$^{\circ}C$] in a voltage of 110[V], and at 456.2[$^{\circ}C$], 619.7[$^{\circ}C$] in a voltage of 220[V]. It is possible, therefore, to distinguish a virgin sample from carbonized samples(graphite) by the exothermic peak.


Carbonization;Phenolic resin;Tracking;Amorphous;Crystalline


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