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Kazuo Tanabe - IEEE Xplore Author Profile

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A locating system based on an advanced time difference of arrival (TDOA) estimation method is developed to locate the position of a discharge source to avoid pulsed electromagnetic interference (PEMI) with the surrounding radio communication environment. In general, from the waveforms of PEMI waves received by an antenna array, the source position can be located or the direction of arrival (DOA) o...Show More
It is important to study the transient performance of grounding systems for lightning surges in order to realize electromagnetic compatibility (EMC) of sensitive electronics, such as information devices and appliances in substations and/or residential houses as well as to prevent damage of electrical apparatus. Recently numerical analysis in time domain employing the Finite Difference Time Domain ...Show More
To ensure the electromagnetic compatibility (EMC) of sensitive electronics, such as information devices in private houses and controllers including digital relays in substations, it is important to study the transient performance of grounding systems for lightning surges. In spite of vertical grounding electrodes being widely used in private houses and substations and being very familiar as ground...Show More
It is important to study the transient performance of grounding systems for lightning surges in order to realize electromagnetic compatibility (EMC) of sensitive electronics, such as information devices and digital relays in substations and/or residential houses. Grounding grids of buried conductors are considered as the most effective solution for grounding systems of high-voltage substations and...Show More
When lightning strikes bulk transmission lines or electric substations, large currents flow through towers or in substations and equipment structures before dissipating in the ground through the grounding systems. The electromagnetic fields generated by such lightning surges cause large currents and voltages, which may result in damage to equipment and serious accidents, such as failure of electri...Show More
Long-term tests of asymmetrical bundles which have the potential to suppress corona activity on conductor bundles have been carried out in the Akagi test line, and their corona performance, mainly audible noise, was measured. Asymmetrical bundles generally show good performance; however, the "added system", which is classified as an asymmetrical bundle due to the addition of a subconductor at the ...Show More
The hum noise performance of 6, 8, 10 conductor bundles (subconductor diameter: 3.84 cm) for 1000 kV transmission lines was measured at the Akagi test site and the results were compared with cage data. In general, hum noise levels calculated with cage data were higher than the long-term test results. It was found that the differences between calculated and measured levels were formulated with the ...Show More
The statistical distribution function of 'hum noise', which is a 100 or 120 Hz pure tone which generates a complex standing wave near AC transmission lines, is derived from random walk theory. The results are verified by comparing them with data measured on the Akagi test line. In order to evaluate the hum noise level near transmission lines, a concept of a temporal and spatial average level is de...Show More
Audible noise (AN) was measured on a variety of conductor bundles at the Shiobara HVDC test line. A new method of AN prediction is proposed based on the test results. The method is applicable not only to bipolar but also monopolar lines. The calculated results obtained by this method can explain the effects of pole spacing and number of subconductors on AN levels. The result of a subjective evalua...Show More