| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
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| Research Abstract |
In this study, following five matters were examined.
First, referring to the perpendicular two-layer composition ground, new electrometer method in search of the electric potential distribution of grounding electrode circumference and grounding resistance was developed. This calculation method obtained by examining the conventional result of the researcher it.
Second, grounding resistance value of earth electrode is measured by the fall-of-potential method. However, laying in the ground conductor that does not intend the grounding exists in the circumference of the measuring electrode. In this study, the effect of this laying in the ground conductor on measurement result was examined.
Third, the international consistency of the standard variously was promoted, and the TN system would be adopted. Though the potential difference does not appear between equipment, because it becomes the one point grounding in the TN system, the earth faulting current becomes the short-circuit current in order to connect the protection conductor with neutral conductor and identical point. Moreover, by using the neutral conductor as medium, the unnecessary current may do the gyre. Then, merit and demerit of the TN system was examined.
Fourth, it is important to know electrical characteristics of the concrete, when the structure grounding scheme was adopted. In this study, the relationship between water content and electrical resistivity of the concrete was clarified.
Fifth, on the impedance characteristic of earth electrode, the following was examined. The method effectively recycled in making the FRP that is the industry waste wood to be the earth electrode material, was studied. That is to say, by mixing carbon fine particle and coagulating agent into the FRP as an ultra fine particle condition, the new earth electrode material was developed.
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