• 조명전기설비학회논문지
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• 제27권11호
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• pp.82-88
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• 2013

It is important to give lightning warning prior to a cloud-to-ground (CG) discharge within an Area of Concern (AOC) because most of lightning damage and victim are usually occurred by the first lightning in the AOC. The aim of this study is to find the optimal operation conditions of the automated lightning warning systems in order to make the best use of the available data. In this paper, the test-operated results of the automated lightning alert and risk management system (ALARM) based on detections of CG discharge and eletrostatic field and optimized at probability of lightning have been described. It was possible to obtain the following warning performance parameters: probability of detection (POD), false alarm ratio (FAR), probability of lightning (POL) and failure-to-warn rate (FTW). The data obtained from trial operation for 5months were not sufficient but the first analysis of domestic lightning warning was carried out. We have observed that the evaluated statistical results through trial operation depend on the various factors such as analysis methods and criteria, topographical conditions, etc. Also we suggest some methods for improvement of POL and POD including the finding of the optimal electric field threshold level to be used, based on the high values of FAR and FTW found in this work.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1414_1415
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• 2009

This paper shows the latest trend of coping plan for mitigating lightning damage in advanced countries. The mitigation measures were investigated in following fields: the organization of government and warning system, education and publicity, support program and concerned service. In results of investigations, the USA and Japan have been organized with the latest technology of warning system and the effective management of organization. So government-level mitigation measures based on the small-scaled lightning warning system need to be considered for reducing the damage of lightning in our country.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.500-503
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• 2006

This paper gives a Wireless lightning detecting and warning system. This system composed of transmitter and receiver. It promptly senses lightning strikes on the power lines and transmission towers by using the lightning current detection circuit in a small transmitter situated on the top of power tower, and it sends the number of lightning strikes and the ID. of the tower to patrols through the receivers. This system will be used to discover the exact location of a lightning strike.

• 조명전기설비학회논문지
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• 제29권12호
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• pp.68-76
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• 2015

We examine the standalone lightning warning system (LWS) and its warning performances for three years. This system acquires and analyzes the data of cloud-to-ground strike (CG), intra-cloud discharge (IC) and electrostatic field (EF) to produce prior warnings with respect to the impending arrival of CG in the area of concern (AOC). The warnings in this system are carried out based on the fixed two areas method. To evaluate warning performances, we analyzed the statistics of warnings with probability of detection (POD) and false alarm ratio (FAR). Based on the previous study, we revised the trigger and clear conditions of lightning warning for improving the performances of the system. As a result of this revision, POD increased from 0.18 to 0.44 and FAR decreased from 0.96 to 0.78 during the summer of 2014. However, the LWS was not possible to trigger effective alerts (EA) because there was no effective lead time (LT) for the fixed two areas method. Problems related to the low detection efficiency of IC and the use of EF data for warnings still decreased POD and increased FAR. Hence, we proposed the development method of a new LWS (NLWS) that would be composed of integrated weather data, the flexible two areas and the user software in order to trigger EA and improve warning performances.

• 조명전기설비학회논문지
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• 제21권10호
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• pp.40-45
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• 2007

뇌경보시스템은 낙뢰에 의한 인적 물적 피해를 예방하는 중요한 장치이다. 본 논문에서는 뇌경보시스템의 주요기능으로 뇌운의 이동과 활동을 감시할 수 있는 뇌방전 위치표정 알고리즘 및 회로에 대해 연구하였다. 뇌방전시 발생하는 전계성분은 whip 안테나와 공진주파수 300[kHz]의 협대역 공진증폭기로 검출한다. 자계파형 측정회로는 직교루프코일과 적분증폭기로 구성되며 주파수 대역은 5[kHz]$\sim$1.2[MHz]이다. 전계파형으로 뇌방전의 극성을 판별하고, 자계파형의 크기와 영점교차점에 의해 방향과 거리를 산출하여 뇌방전의 위치를 표정한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.274-277
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• 2006

This paper describes a lighting warning system (LWS) which consists of a corona needle electrode, a low noise differential amplifier, an A/D converter, an one-chip microprocessor, a LCD and alarm devices. The corona needle electrode is used to measure electric field intensity caused by thunderclouds on the ground level. To evaluate the sensitivity of the LWS, calibration experiment was carried out using a round-shape parallel plate electrode system. The theoretical and experimental results show that the LWS can measure electric field intensity over 2 [kV/m].

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.297-300
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• 2008

This paper described a New-Concept lightning warning system (LWS) which can measure electric field intensity on the ground level by an electric field mill (EFM) and calculate the lighting location by radiated electro-magnetic waveform. The EFM measures electric field up to 20[kV/m] with the sensitivity of 0.15[V/kV/m] and frequency bandwidth of the loop antenna was ranges from 5.2[kHz] to 1.71[MHz]. The LWS provides data on the movements of thunderclouds and the possibility of lightning return stroke.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.340-343
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• 2009

Recently, the lightning damage to human and structure is increasing steadily and many countries try to reduce lightning-caused casualties and economical loss through special disaster management system. The organization of warning system and management system for lightning damage in developed countries were investigated in this paper. The organization of central government for disaster management and cooperation system with local government in USA, Japan, the Britain, and Germany were introduced and the division of roles with meteorological administration were described.

• 센서학회지
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• 제10권4호
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• pp.250-258
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• 2001

본 연구에서는 지상에서 전장의 세기를 측정하는 것에 의해 낙뢰 예측이 가능한 뇌경보시스템을 개발하였다. 뇌경보시스템은 전장센서로써 회전형 필드밀, 임피던스변환기, 2단 증폭기 및 마이크로프로세서로 구성되어 있다. 교정 실험결과로부터 뇌경보시스템의 주파수대역과 최대 분해능은 각각 $DC{\sim}200\;[Hz]$, 73[V/m]이었으며, 뇌운에 의한 대지전장의 세기를 18.7 [kV/m]까지 측정할 수 있음을 확인하였다. 실제 상황에서 본 뇌경보시스템의 감지능력을 평가하기 위하여 뇌운의 모델을 이용한 컴퓨터 시뮬레이션을 수행하였으며. 그 결과 관측점으로부터 6 [km] 이내에 접근하는 뇌운의 움직임을 관측할 수 있었다.

• Journal of Electrical Engineering and Technology
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• 제13권4호
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• pp.1697-1704
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• 2018

As a key component of lighting location system (LLS) for lightning warning, the atmospheric electric field measuring is required to have high accuracy. The Conventional methods of the existent electric field measurement meter can only detect the vertical component of the atmospheric electric field, which cannot acquire the realistic electric field in the thunderstorm. This paper proposed a three dimensional (3D) electric field system for atmospheric electric field measurement, which is capable of three orthogonal directions in X, Y, Z, measuring. By analyzing the relationship between the electric field and the relative permittivity of ground surface, the permittivity is calculated, and an efficiency 3D measurement model is derived. On this basis, a three-dimensional electric field sensor and a permittivity sensor are adopted to detect the spatial electric field. Moreover, the elevation and azimuth of the detected target are calculated, which reveal the location information of the target. Experimental results show that the proposed 3D electric field meter has satisfactory sensitivity to the three components of electric field. Additionally, several observation results in the fair and thunderstorm weather have been presented.