재래식 화재감지기와 P형 수신기에 대한 화재위치검출 및 신뢰성 개선

지승욱(Seung-Wook Jee),김시국(Shi-Kuk Kim),양승현(Seung-Hyun Yang),이재진(Jae-Jin Lee),김필영(Pil-Young Kim),이춘하(Chun-Ha Lee) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.5

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.

통전중인 도선에서 화재 가능성에 관한 기초 연구

지승욱(Seung-Wook Jee),김시국(Shi-Kuk Kim),이춘하(Chun-Ha Lee),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.6

2006년 우리나라에서 발생된 전기화재 중 63.2[%]는 전기배선에서 단락에 의해 발생되었다. 따라서 전기배선에 의한 화재가능성에 대한 연구가 필요하다. 이에 본 연구에서는 통전중인 도선이 주변 조영재와 접촉할 가능성 및 접촉에 의한 화재가능성에 대하여 연구하였다. 그 결과 도선에 흐르는 전류가 클수록 주변의 조영재와 접촉할 가능성이 높고 특히, 도선의 온도가 도선피복의 발화점을 넘는 경우 도선과 주변 조영재 간에 불꽃을 동반하는 방전이 발생됨으로써, 전기화재 가능성이 더욱 커지는 것을 실험적으로 알 수 있었다. In total electric fire in Korea in 2006, a rate of the electric fire caused of short in electric wire is over 63.2[%]. It is needed to study a fire potentiality in electric wire. This paper studies contact and fire potentiality between a electric wire and conductors existed around the electric wire. As amplitude of current in electric wire is bigger, as it has higher possibility to contact between a electric wire and conductors existed around the electric wire. In case of temperature of wire is over combustion point of outer sheath, it is appeared to spark discharge between wire and conductors. So the fire potentiality raise up.

플러그 내부에서 발생된 소선 단선에 의한 발열특성

지승욱(Seung-Wook Jee),김시국(Shi-Kuk Kim),이춘하(Chun-Ha Lee) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.4

There are over 30[%] of electric fires in Korea happened at wire or wiring devices. For its prevention many safety devices are set up electric equipments. These safety devices are not working in a rated current's condition of electric equipment. But when wire is partially disconnected, electric fire is able to be happened even though current is smaller than a rated current value. This paper studied thermal characteristics and fire ability when wire in plug is partially disconnected. The experiment is progressed a method that inner wire of plug is partially disconnected and after that current that is less than a rated current is flowed. As the result, heating occurred in near of partially disconnected wire makes that outer sheath is melted, plug cover is carbonized, and even sometimes wire is fused. And results of analysis of thermal image of partially disconnected wire happened in plug, it shows a difference to heating distribution and temperature appeared surface of plug depend on a progress of a partially disconnected wire.

장애경보 방지를 위한 연소 연기입자와 비연소 연기입자의 광 특성 분석

지승욱(Seung-Wook Jee) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.10

This paper is basic study for development of an advanced photoelectric type smoke detector that has high reliability by reducing the occurrence of nuisance alarms. This paper was attempted to distinguish optical characteristics of the typical fire smoke particle and non-fire smoke particle. According to UL 268 standards, three types of test fires (the paper, the wood and the flammable liquid) were used in this paper for measurement of the fire smoke particles, and the water vapor and the cigarette smoke that were known as the main cause of the nuisance alarms were also used for the non-fire smoke particles. A smoke detection chamber was created, which was equipped with one light source and several light sensors for enabling simultaneous detection of light extinction and scattering, respectively. This paper analyzes the optical characteristics of each smoke particle using this chamber.

VCTFK 끝단에서 발생되는 트래킹의 진전특성

지승욱(Seung-Wook Jee),김시국(Shi-Kuk Kim),옥경재(Kyung-Gea Ok),이춘하(Chun-Ha Lee),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.8

본 논문은 배전선으로 널리 사용되고 있는 비닐캡타이어 타원형코드(Polyvinyl chloride insulated cabtyre oval cord, VCTFK)의 끝단에서 발생되는 트래킹의 진전특성에 대하여 언급하고 있다. 트래킹은 VCTFK의 끝단에 전해액을 적하함으로써 발생시켰다. VCTFK 끝단에서 발생되는 트래킹 진전과정 및 그 특징은 다음과 같다. 방전으로 인해 VCTFK 끝단에서 탄화가 시작되었고 침식도 일어났다. 도체에서 가까운 절연층이 먼저 침식되었으며, 피복층은 그 이후에 침식되었다. 침식이 진행된 이후, VCTFK 끝단의 표면에서 탄화물의 적층이 시작되었다. 적층 단계에서 아크를 동반했으며, 트래킹 파괴로 이어졌다. This paper describes the characteristic of tracking progress happened at the end of the polyvinyl chloride insulated cabtyre oval cord(VCTFK) that is widely used for distribution cord. Tracking is occurred owing to the drop of electrolyte at the end of the VCTFK. The tracking progress and its characteristic happened at the end of the VCTFK are as follow; Carbonization and electrical erosion are happened at the end of the VCTFK. Electrical erosion is begun at the insulation layer near conductors. After that, it is also happened at the sheath layer. Accumulation of carbonized insulation and sheath materials at the end of the VCTFK is begun after progress of electrical erosion. When the accumulation is progressed arc discharge is appeared and finally it goes to tracking breakdown.

전류 모니터를 이용한 백열등 부하 전기설비에서 사고 징후 검출에 관한 연구

지승욱(Seung-Wook Jee),옥경재(Kyung-Gea Ok),김시국(Shi-Kuk Kim),이춘하(Chun-Ha Lee),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.1

본 논문은 백열등 부하 전기설비에서 측정한 전류 파형으로 전기사고 징후를 조기에 검출하기 위한 것이다. 첫째, 저항성 회로에서 전류 모니터의 특성을 분석하였다. 둘째, 백열등을 부하로 하는 전기설비를 구축하고, 전기설비의 일부에서 KS C IEC(Korea Standard C International Electrostatic Commission) 60112에 따라 트래킹을 발생시켜 사고를 모의하였다. 전기사고 징후는 전류 모니터로 측정한 전류파형을 분석함으로써 검출되었다. 그 결과 부하의 수에 관계없이 사고의 최종 단계인 트래킹으로 진전되어 갈수록 전류 파형에는 점점 큰 전류 펄스가 보였고 출현빈도도 더욱 높아졌다. This paper describes an early detection for indication of electric accident using current waveform which is measured in electric equipments consisted incandescent lamps. At first, it analyzes characteristics of current monitor in resistive electric circuit. In second, the electric equipment is consisted of incandescent lamps. And the electric accident is simulation of tracking according to KS C IEC(Korea Standard C International Electrostatic Commission) 60112 at some part of the electric equipment. The indication of the electrical accident is detected to analyzing current waveform measured by current monitor. As the tracking breakdown, electric accident, processes, as current pulse is bigger and ratio of appearance also is increased irrespective of amount of load.

화원에 따른 광전식 연기감지기 반응시간 분석

지승욱(Seung-Wook Jee) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.5

The fire testing performed for smoke detector model approval in Korea tests only one kind of fire smoke. A photoelectric spot-type smoke detector using Mie scattering is affected by the wavelength of light beam and the particle diameter. According to UL (Underwriters Laboratories Inc.) 268 standard, this paper analyze the characteristic of the response for a photoelectric spot-type smoke detector on sale in Korea using various fire smokes. Probability that the response time is included in non-defective range is 100% in paper fire, 90% in wood fire and 75% in flammable liquid fire, 90% in wood fire and 75% in flammable liquid fire. According to the estimation for population mean of the response time choosing a confidence level of 99%, a maximum of 19% for wood fire and that of 38% for flammable liquid fire are defective. As the result of analysis of smoke particle, this paper is found that these results are caused by the smoke particles are wide variations in size or have very black.

전계해석을 이용한 전장용 절연보드에서 발생되는 도전성 탄화로의 진행경로 분석

지승욱(Seung-Wook Jee),이봉섭(Bong-Seob Lee),임동영(Dong-Young Lim) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.7

As the rate of electronicization of automobiles increases, the use of insulation boards for electrical equipment has increased simultaneously. The insulation board used in automobiles has been demanded for its stability as well as miniaturization. When the insulation board for electric equipment is used in a harsh environment, it can cause a fire by forming a carbonized conductive path due to wetting. This paper analyzed the progress and characteristics of the carbonized conductive paths formed on the insulation board. And the electric field analysis was also performed by stages of the formation of a carbonized conductive path using the simulation program. As a result, two carbonization paths were found and theoretical analysis was performed. The results of the above study can be used for predicting the risk of insulation boards.

브리지 특성이 트래킹에 미치는 영향에 관한 연구

지승욱(Seung-Wook Jee),옥경재(Kyung-Gea Ok),이춘하(Chun-Ha Lee),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.8

본 논문은 전해액에 의해 양전극 사이에 형성되는 브리지가 트래킹에 미치는 영향을 기술하고 있다. IEC(International Electrotechnical Commission) 60589의 방법으로 만들어진 1, 3, 5[wt%] NaCl 용액을 이용하여 KS C IEC 60112의 전극에서 트래킹 실험을 하였다. 트래킹 진전과정 중에서 브리지가 형성되었을 때의 전압, 전류, 저항 및 열화상을 측정하여 분석하였다. 그 결과 전해액의 전도율이 커짐에 따라 브리지에서 발생되는 줄열도 커졌다. 하지만 전해액의 기화열로 인해 전해액의 끓는점을 넘지는 못했다. 다만, 전해액의 전도율이 커짐에 따라 건조대 형성에 소요되는 시간이 짧아졌다. 따라서 다음 적하까지 보다 긴 시간동안 건조대를 유지함으로써, 방전 기회가 증가하기 때문에 트래킹 진전이 빨라짐을 알 수 있었다. This paper describes the influence of the bridge formed between electrodes by electrolyte for tracking process. Electrolytes is made by IEC(International Electrotechnical Commission) 60589, NaCl added to deionized water as each 1, 3, 5[wt%]. The used test equipment is made according to KS(Korean Industrial Standard) C IEC 60112. It is investigated voltage, current, value of resistance and thermal image when bridge formed between electrodes on tracking process As a result, as conductivity of electrolyte gets bigger as Joule’s heat on bridge also gets bigger. But It is not over electrolyte’s boiling point clue to evaporation heat of electrolyte. However as conductivity of electrolyte gets bigger as the necessary time of dry band gets shorter. So dry band is existed more long time between ahead of droplet to next droplet and discharge chance at dry band gets much. Therefore tracking process gets faster.

GIS용 광 CT 센서부의 위치와 각도변화에 따른 출력 특성

박정환(Jung-Hwan Park),지승욱(Seung-Wook Jee),이광식(Kwang-Sik Lee),김민수(Min-Soo Kim),김정배(Jung-Bae Kim),박원주(Won-Zoo Park) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월

현재 국내ㆍ외에서 GIS(Gas Insulated Switchgear)용 광 CT(optical current transformer)가 활발히 연구ㆍ개발되고 있다. 이러한 광 CT는 전력선에 발생하는 자기장에 의해 레이저 빛의 파장 각도가 변하는 현상인 Faraday Effect를 기본 원리로 한 전류측정용 기기이다. 본 논문에서는 GIS용 광 CT개발을 목적으로 한 기초적 연구로써 자기장이 발생하는 전력선에 장착되는 센서부가 도선을 중심으로 해서 어떻게 위치하느냐에 따른 광 CT의 출력신호를 측정하여 연구하였다.