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Ethylene propylene rubber insulations under operation for 16 years in boiling water reactor containments were subjected to additional thermal aging at 110°C. 70 days were needed to decrease their mechanical property to the limit that they cannot secure the durability against design-basis events. This degradation rate is found to be three times slower than that predicted on the basis of an accelerated...
In 2011, Japan suffered from a massive earthquake and tsunami. Thermal power plants operated by the Tohoku Electric Power Company were also affected by seawater inundation. Almost all power equipment such as switchgears, motors, cables, wires in Shin-Sendai Thermal Power Plant were inundated. This study investigates seawater intrusion in several low voltage wires, and discusses the refurbishing criteria...
The "water tree" is a degradation mode of power cable with polymer insulation. A water tree is composed of small droplets filled with water. As the conductivity in water tree is very high, it leads to dielectric breakdown when it grows up. Inside the water tree is filled with trap sites. Therefore, a water tree can be recognized as an electret.
In this paper, only very small parts of research topics in CRIEPI are introduced. CRIEPI welcomes all the researchers who are interested in the field mentioned in this paper, to have variable discussion for the technologies and investigations mentioned above.
6 kV to 60 kV class XLPE cables are widely used and have been playing important roles in power distribution and transmission systems in Japan. For the XLPE cables in these voltage levels, the water tree dominates aging degradation. Therefore, precise on-site detection techniques of water trees in their length are considered to be important for operation and maintenance of these XLPE cables. The author...
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