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The authors have confirmed that most major cause of degradation for 6 to 60 kV class XLPE cable in Japan is water trees with needle shape, which would develop only a few in an XLPE cable with its length of 100 m or so. Therefore, establishment of the detection and diagnostic methods for such water trees is important for degradation assessment and lifetime prediction of aged XLPE cables. The authors...
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...
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration phase and frequency were investigated. Because the length of the discharge gap changed...
This paper describes some new aspects of the reration between partial discharge characteristics and several void model structures in terms of statistical features of partial discharge pulse magnitudes against applied voltage phase. Newly proposed parameters here are the skewness and kurtosis of a φ-q pattern (applied voltage phase versus cycle mean discharge magnitude) and have been found to represent...
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