Franklin Japan Corporation

Kawasaki, Japan

Franklin Japan Corporation

Kawasaki, Japan
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Matsui M.,Franklin Japan Corporation | Sugita A.,Franklin Japan Corporation | Michishita K.,University of Shizuoka | Kurihara S.,Kyushu Electric Power | Honjo N.,Electric Power Development Co.
2016 33rd International Conference on Lightning Protection, ICLP 2016 | Year: 2016

The location accuracy of the Japanese Lightning Detection Network (JLDN) has been evaluated for a long time. It was reported that the average location accuracy of the JLDN was approximately 0.44 km for return strokes of negative downward lightning striking wind turbines in summer and 0.58 km for return strokes associated with upward lightning initiated from wind turbines in winter. However, the authors found that many stroke positions calculated by the JLDN tended to be located in specific directions. Therefore, we assumed this was caused by differences in the propagation speed of the electromagnetic waves that emitted from lightning discharges, passing along surfaces of varying conductivity. We recalculated the lightning positions of strokes that hit the wind turbines after applying propagation delay corrections. The difference between the times measured at the sensor and calculated times was smaller after the recalculation. As a result, location accuracy was improved from 0.44 km to 0.31 km for downward lightning strokes in summer, and it was improved from 0.79 km to 0.12 km for lightning strokes in winter. © 2016 IEEE.


Matsui M.,Franklin Japan Corporation | Michishita K.,Shizuoka Univaersity | Kurihara S.,Kyushu Electric Power
IET Seminar Digest | Year: 2015

The Japanese Lightning Detection Network (JLDN) has been operated to observed lightning occurring in Japan and its surrounding areas since 1998. The frequency of lightning flash is an important parameter for creating lightning protection designs. If the location accuracy of the Lightning Location System (LLS) is not good, it is very difficult to provide parameters for them. We have observed lightning current waveforms using Rogowski coils installed at wind turbines and evaluated the location accuracy of the stroke location estimated by the JLDN by the comparison with the position of the wind turbine. There are two continental scale lightning detection networks in the world. One is the North American Lightning Detection Network (NALDN) in the United States and Canada, and the other is the lightning detection network called European Cooperation for Lightning Detection (EUCLID) in Europe. We investigated the location accuracy of these networks with reference to various papers on their location accuracy. We compared the performances of the JLDN with that of the NALDN and the EUCLID. In the results, we showed that the JLDN has same performance as the NALDN and the EUCLID in location accuracy. However, some recent reports said the location accuracies of the NALDN and the EUCLID were improved by applying various techniques. In this paper, we show some solutions for improving the location accuracy of the JLDN at present. © 2015, Institution of Engineering and Technology. All rights reserved.


Matsui M.,Franklin Japan Corporation | Michishita K.,University of Shizuoka | Kurihara S.,Kyushu Electric Power
IEEJ Transactions on Power and Energy | Year: 2015

The Authors observe waveforms of lightning currents by Rogowski coils at Muregaoka wind farm in Kagoshima. We succeeded in observing three sets of the current waveforms of negative downward lightning flashes to a wind turbine on two summer seasons between 2013 and 2014. The mean location errors of those strokes observed by the JLDN are 557m and 316m for first and subsequent strokes, respectively. Information from sensors within 730 km from lightning striking point was used in the case that location error was less than 400 m. The mean errors of the peak currents estimated by the JLDN were -10% and +10% of the currents measured by the Rogowski coil for the first stroke and the subsequent ones respectively. © 2015 The Institute of Electrical Engineers of Japan.


Yanagawa S.,Shoden Co. | Yamamoto K.,Chubu University | Naito Y.,Shoden Co. | Takahashi N.,Nissan Motor Co. | Matsui M.,Franklin Japan Co.
Electric Power Systems Research | Year: 2015

Many kinds of electronic equipment have been used in recent automobiles. Eco-friendly automobiles such as electric, fuel-cell and hybrid vehicles have spread rapidly. Those automobiles are usually sensitive to electromagnetic disturbance caused by lightning and so on. When an automobile is struck by lightning, lightning current usually flows into the earth through the vehicle body. The corresponding transient electromagnetic fields appearing inside the vehicle and shunt lightning current through electronics systems are considered sources of malfunctions. From an automobile safety and equipment protection viewpoints, investigations of protective measures are imperative. Before lightning protection methodologies are proposed, existing lightning damages to automobiles must be clarified. The statistical data on automobile lightning damage reports by conducting field surveys and web-based researches had been gathered. In this paper, the result of statistical data has been introduced. Right in the middle of the field surveys of lightning protection for automobiles, the outstanding fire accident of an automobile in Kanto district in Japan occurred. Right after hearing the news, interviews against the fire fighters about their field survey had been conducted; the scene of the accident and burned automobile had also been investigated. In this paper, the results of the interview and investigation have also been discussed. © 2015 Elsevier B.V.


Matsui M.,Franklin Japan Corporation | Takano N.,Sankosha Corporation | Takano N.,Sagami Techno Center
2010 Asia-Pacific Symposium on Electromagnetic Compatibility, APEMC 2010 | Year: 2010

This paper discusses evaluation of Lightning Location accuracy of Japan Lightning Detection Network (JLDN). JLDN has observed lightning activities since 1998. It has been said that the nominal location accuracy of JLDN is less than 500 meters in most area of Japan. But, the actual location accuracy of JLDN has not been evaluated. Sankosha Corporation installed lightning video camera system on the roof top of their building in Sagami Techno Center. They have observed lightning with it around Sagamihara city, Kanagawa, Japan. We show some video images and estimate actual lightning location. We compare them with location observed by JLDN. We also discuss the differences between lightning location estimated with video images and lightning location observed by JLDN. Finally, we report the actual location accuracy of JLDN regarding cloud to ground discharges in this paper. © 2010 IEEE.


Ishii M.,University of Tokyo | Saito M.,University of Tokyo | Fujii F.,University of Tokyo | Sugita A.,Franklin Japan Co.
2010 Asia-Pacific Symposium on Electromagnetic Compatibility, APEMC 2010 | Year: 2010

It was revealed that serious lightning faults of high voltage power transmission lines in winter along the coastal area of the Sea of Japan were due to upward lightning initiated from transmission towers. Wind turbines in the same region, reportedly suffer from high lightning fault rate, must also generate frequent upward lightning. Taking account of the aerological data which indicate the heights of the charged region in thunderclouds, a method to evaluate frequency of upward lightning from tall structures in cold regions of Japan in winter is proposed. With this new method, it is possible to evaluate the probability of lightning hits to tall structures in Japan through the year. © 2010 IEEE.


Ishii M.,University of Tokyo | Saito M.,University of Tokyo | Fujii F.,University of Tokyo | Matsui M.,Franklin Japan Co. | Natsuno D.,Toyo Sekkei
2011 7th Asia-Pacific International Conference on Lightning, APL2011 | Year: 2011

In Japan, transmission lines or wind turbines in the coastal area of the Sea of Japan have suffered from higher frequencies of serious troubles by lightning in winter than those in summer. The thunderstorm days in this area are comparable in winter to those of summer; however, the number of lightning strokes observed by lightning location systems (LLS) in winter is much smaller. In winter, concentration of lightning hits to tall structures is observed by LLS in the coastal area of the Sea of Japan. Out of the observation by LLS, the authors propose an experimental formula to estimate the frequency of upward lightning occurring on tall structures in winter in Japan. © 2011 IEEE.


Matsui M.,Franklin Japan Corporation | Hara Y.,Franklin Japan Corporation
2011 7th Asia-Pacific International Conference on Lightning, APL2011 | Year: 2011

Japanese Lightning Detection Network (JLDN) operated by Franklin Japan Corporation (FJC) has been provided stroke data as our standard commercial lightning data [1]. However, it is much useful for lightning protection system designs to use flash data rather than using stroke data [2]. Therefore, this paper examines the method of conversion of stroke data into flash data and multiplicities of lightning flashes observed by JLDN. In addition to the above, we also compare our data with other nationwide lightning detection network and discuss the characteristics of flash multiplicity measured by JLDN. The FJC uses the algorithm which is different from the National Lightning Detection Network (NLDN). Therefore, we discuss the validity of the JLDN flash algorithm by comparing flash multiplicities calculated by both the JLDN flash algorithm and the NLDN one. In addition, we compare the flash multiplicities measured by JLDN with those measured by other nationwide lightning detection network and examine the network performance of JLDN regarding the flash multiplicity. © 2011 IEEE.


Matsui M.,Franklin Japan Corporation | Hara Y.,Franklin Japan Corporation
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

It has been reported that winter lightning occurring along the coastal area of the Sea of Japan has different characteristics when compared to summer lightning. However, those reports described the characteristics only in the coastal area of Honshu, the main island of Japan and there are no reports regarding winter lightning in the region of the northernmost island of Japan, Hokkaido. The authors have studied the characteristics of winter lightning observed by the Japanese Lightning Detection Network (JLDN) in the Hokkaido region and report the results of our studies in this paper. We compare our observations in Honshu and in Hokkaido and report the differences between those regions. This is the first paper describing the characteristics of winter lightning in Hokkaido. © 2014 IEEE.


Saito M.,University of Tokyo | Ishii M.,University of Tokyo | Fujii F.,University of Tokyo | Matsui M.,Franklin Japan Corporation
IEEJ Transactions on Power and Energy | Year: 2012

Seasonal variations of number of high current lightning discharges exceeding 100 kA observed by JLDN (Japanese Lightning Detection Network) were analyzed. The months with averaged altitudes of -10°C level higher than 5.7 km are classified as ordinary summer from the viewpoint of lightning activity. Meanwhile, on the coast of the Sea of Japan, more than 90% of negative high current lightning discharges were -GC (Ground to Cloud) strokes in the months when monthly averaged altitudes of -10°C level are lower than 2.7 km. These months are classified as the winter lightning season when upward lightning flashes frequently occur. Months other than winter or summer are classified as spring or autumn. In these seasons, the proportions of positive high current lightning discharges are higher than those of negative discharges like winter. Thus, the charge structure in the thunderclouds of spring and autumn may be similar to that in winter, and high current lightning strokes tend to occur. Since this variation of seasons is different in each area of Japan, relation of seasons, areas, and densities of high current lightning discharges were analyzed. © 2012 The Institute of Electrical Engineers of Japan.

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