• Title, Summary, Keyword: electrical fire

Search Result 808, Processing Time 0.042 seconds

A Study on the Transient State Characteristics of TFR-8 Cable caused by Over Current (과전류에 의한 TFR-8 케이블의 과도상태 특성에 관한 연구)

  • Kim, Byeong-Jo;Kim, Jae-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.1
    • /
    • pp.57-63
    • /
    • 2015
  • The incidence of fires caused by electrical factors has increased with the growth in domestic electrical consumption. According to the national fire data system of national emergency management agency, electrical fires accounted for 20% of all domestic fires in the last 10 years. Electrical fires are mainly caused by short circuit, leakage current, defect in an electrical equipment, over load, utility fault, etc. The fault current can be several times larger than the nominal current, thereby exceeding the rated current of cable. Consequently, the cable conductor, typically copper wire, heats up to a temperature that ignites surrounding combustibles. This paper describes the transient characteristics of the 0.6/1kV, TFR-8 cable have been investigated, and analyzed under the over current conditions for reduce the risk of electrical fire by experimental and FEM analysis. The experimental and FEM(Finite Element Method) analysis results of temperature and resistance variation according to the over current in copper wires were analyzed. The experimental results coincide well with the FEM analysis.

Efficiency Estimation of Toxicity Free Eire Resistance Cable

  • Yoon, Hun-Ju;Hon, Jin-Woong
    • Transactions on Electrical and Electronic Materials
    • /
    • v.3 no.3
    • /
    • pp.34-38
    • /
    • 2002
  • In this paper, efficiency estimation of toxicity fee fire resistance cable experiments was measured smoke density of toxicity free fire resistance polyolefin insulation material and electric field dependence of tree shape in low density polyethylene (LDPE). One of the most serious causes of failure in high-voltage cables, can be an electrical discharge across an internal gab or void in the insulating material. Treeing due to partial discharge is one of the main causes of breakdown in the insulating materials and reduction of the insulation life. Therefore the necessity for establishing a method to diagnose the aging of insulation materials and to predict the breakdown of insulation and research of the fire resistance character has become important. First, we have studied on electric field dependence of tree shape in LDPE about treeing phenomena occurring on the high electrical field. Second, the measurement method is the attenuation quantity of irradiation by smoke accumulating with in a closed chamber due to non-flaming heat decomposition and flaming combustion. A main cause of fire-growth and generating toxic gas when, it bums, should be dealt with great care in life. safety design. The fire gases were occurred carbon monoxide and decomposition than in polyolefin due to incomplete combustion of PVC, which has high content of carbon in chemical compound.

A Study on Electric Fire Risk and Safety Measures in Traditional Markets through the Significant Fire Events (주요 사례를 통한 재래시장의 전기화재 위험성 및 안전대책에 관한 연구)

  • Choi, Seung-Bok;Lee, Chang-Woo;Choi, Don-Mook
    • Fire Science and Engineering
    • /
    • v.24 no.5
    • /
    • pp.122-127
    • /
    • 2010
  • There are 1,550 small or large traditional markets in the whole country. They have many dangerous elements of fire, because of using various electrical products in poor and small space. Recently, government has supported the modernization of traditional market. But, only 50% of them has modernized. There has always been high level of fire risks because of the both modernized and nonmodernized facility are not fit for "Technical Standards on Electrical Facilities". Accordingly, we examined electrical facility setting and use about modernized and non modernized traditional markets which has ever been fired.

Analysis of Fire Accident on DC Electric Traction Vehicles Caused by Breakdown in the Line Breaker (회로 차단기 절연파괴로 인한 직류 전기철도 화재 사고사례 분석)

  • Park, Nam-Kyu;Song, Jae-Yong;Goh, Jae-Mo;Kim, Jin-Pyo;Nam, Jung-Woo
    • Journal of the Korean Society of Safety
    • /
    • v.32 no.6
    • /
    • pp.16-21
    • /
    • 2017
  • Fire or electrical problem while DC electric traction vehicle operation caused by various reasons can lead to not only suspension of the operation, but also severe aftermath such as massive casualty. In this paper, fire analysis on DC electric traction vehicle caused by electrical breakdown on line breaker, which is in connection with the power supply, is presented. When the electric arc, the by-product of frequent line breaker operation, is not fully diminished, it leads to electrical breakdown and fire. Especially, electrical breakdown can be easily induced by the open-and-close operation of inner contractor inside line breaker, eventually followed by ground fault and generation of transient current. Electric arc is consequent on the ground fault and acts as possible ignition source, leading to fire. Also, during the repetitive operation of the line breaker, the contactor is separated each other and some copper powder is generated, and the copper powder provided breakdown path, resulting in fire.

A Study on Dynamic Characteristics of EFPCD for Electrical Fire Prevention (전기화재 예방을 위한 EFPCD동작 특성에 관한 연구)

  • 이상호;오홍석
    • Fire Science and Engineering
    • /
    • v.16 no.3
    • /
    • pp.8-11
    • /
    • 2002
  • Recently, the spark and the overheat due to in the failure of pressure contacts on connecting points and the momentary short circuit have been the major causes of electrical fire because these may cause the deposition and the graphite of insulating materials in electrical wiring system. Also, because in these cases the current is a surge one, the losses and faults of a communication, a home appliances, a computer and a measuring instrument may occur. Especially, in such cases, we are very difficult to detect the failure of pressure contacts on connecting points and the momentary short circuit. In this paper, we have developed an auxiliary control device, the electrical fire prevention control device(EFPCD), of an earth leakage breaker(ELB). And we can pre-vent the electrical fire caused by the spark and the overheat occurring in the failure of pressure contacts in connecting points and the momentary short circuit with the EFPCD.

Construction of Case-based System for the Cause Diagnosis of an Electrical Fires (전기화재 원인진단을 위한 사례기반 시스템 구축)

  • Lee, Jong-Ho;Kim, Doo-Hyun;Kim, Sung-Chul
    • Fire Science and Engineering
    • /
    • v.21 no.2
    • /
    • pp.42-47
    • /
    • 2007
  • This paper presents the development of a case-based system for an electrical fire cause diagnosis system using the entity relation database. The relation database which provides a very simple but powerful way of representing data is widely used. The system focused on database construction and cause diagnosis can diagnose the causes of electrical fires easily and efficiently. In order to store and access to the information concerned with electrical fires, the key index items which identify electrical fires uniquely are derived out. The case-based system consists of a case which contains information from the past fires. The case-based system could present the cause of a newly occurred fire to be diagnosed by searching the case-based database for reasonable matching. The case-based system has not only searching functions with multiple attributes by using the collected various information(such as fire evidence, structure, and weather of a fire scene) but also more improved diagnosis functions which can be easily used for the electrical fire cause diagnosis system.

A Phenomenological Studies on Ignition Characteristics of Wires by Local Impact, Over Loading and Overcurrent (국부적 충격, 과부하 및 과전류에 의한 전선의 발화특성에 관한 현상학적 연구)

  • Lee, Jeong-Jin;Lee, Chang-Woo;Choi, Don-Mook
    • Journal of the Korea Safety Management and Science
    • /
    • v.12 no.4
    • /
    • pp.53-60
    • /
    • 2010
  • When a fire breaks out, it is difficult to find out the causes of the fire, because combustible things around fire scene are usually burnt away. Among many causes of fires are electronic wires, this thesis deal with the destroyed sheath of electronic wires caused by fire. It was studied with the use of measurement devices focusing on the distinctions of wires and conductors. This study especially emphasized the process of deterioration, burning pattern, and composition of electronic wire conductor. It also has a phenomenological approach to the distinctive cause of fire by some partial force. The fire prevention methods have been suggested through the analysing results of fire patterns. This study is expected to be a useful material for analyzing various electrical fires.

Electrical Fire Hazards Analysis of Electric Iron and Heater Using Fault Tree Analysis

  • Hong, Sung-Ho
    • International Journal of Safety
    • /
    • v.7 no.1
    • /
    • pp.15-20
    • /
    • 2008
  • The primary goal of this study is to analyze fire hazards of electric home appliances such as electric iron and electric heater using fault tree analysis(FTA). A fault tree(FT) is constructed and used to analyze fire hazards in electric home appliances. The fault tree is built from events that may occur in electric home appliances. The failure rate of basic events are derived from the value of experimental results and reference. And an algorithm analyzing fire in electric home appliances is suggested. We show how fault tree analysis, carried out by means of failure rate, is able to diagnose fire hazards of electric home appliances in a precise manner. We present numerical results such as fire probability of electric home appliances, importance measure, fire cause, etc. It can be helpful in preventing the fire hazards in electric home appliances.

A Study on the Electrical Fire Risk of Terminal Block Due to Single and Composite Cause (단일 및 복합 원인에 의한 단자대 전기화재위험성에 관한 연구)

  • Kim, Si-Kuk;Gum, Dong-Shin;Lee, Chun-Ha
    • Fire Science and Engineering
    • /
    • v.29 no.5
    • /
    • pp.57-66
    • /
    • 2015
  • This thesis is based on a research to investigate the electrical fire risk due to the single and composite cause in a terminal block. This paper analyzed the thermal characteristics depending on the screw torque change and contact resistance change to measure the fire risk due to the poor contact from single cause first. To measure the fire risk due to the composite cause, the acceleration tracking depending on the contact resistance change was experimented to check the correlation of poor contact and tracking to fire. The experiment result showed that the thermal characteristics were clearer as the screw torque in poor contact status and magnitude of contact resistance increased and that the thermal characteristics of terminal block depending on the contact resistance change was more reliable than the thermal characteristics depending on the screw torque change. Moreover, the terminal block poor contact and tracking were correlated in the case of the composite cause, and when two composite causes were interacted, the electrical fire risk was higher than the single cause.

Detection of Fire Location And Reliability Improvement of the Conventional Fire Detector and P-type Receiver (재래식 화재감지기와 P형 수신기에 대한 화재위치검출 및 신뢰성 개선)

  • Jee, Seung-Wook;Kim, Shi-Kuk;Yang, Seung-Hyun;Lee, Jae-Jin;Kim, Pil-Young;Lee, Chun-Ha
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.25 no.5
    • /
    • pp.39-44
    • /
    • 2011
  • Automatic fire alarm system is set up to automatically detect fire on buildings. Because of economic reasons, P-type receiver and a conventional type fire detector is normally used for automatic fire alarm system in Korea. Because early detection of fire is regarded as important, the need of finding technique of fire location increases. This paper is studied a method to improve a reliability and add a function of fire location detection on a conventional type fire detector and P-type receiver. Fire location is detected by a method that controller attached on the receiver and the detector is read with a time lag. A reliability of fire detection alarm system is improved with a method that false fire alarm is able to decrease using two different principle detector together. This paper is studied for basic data of improvement of low-cost addressable automatic fire alarm system.