Various Information Obtained from Acoustic Emissions Owing to Discharges in XLPE Cable

An acoustic emission (AE) technique is useful for detection of partial discharges (PDs) at a joint and a terminal section of a cross-linked polyethylene (XLPE) cable. For AE technique, it is not difficult to detect a PD using AE sensors. However, it is difficult to grasp whether the detected AE signal is owing to a single discharge or not. Additionally, when an AE technique is applied at a terminal section of a XLPE cable in salt pollution district, for example, there is possibility of detection of AE signals owing to creeping discharges on the surface of electric power apparatus. In this study, we evaluated AE signals in order to grasp what kind of information we can get from detected AE signals. The results showed that envelop detection of AE signal and a period which some AE signals were continuously detected were good indexes for estimating state-of-discharge.

Authors:

• Tatsuya Sakoda
• Yuta Nakamura
• Junichiro Kitajima
• Masaki Sugiura
• Satoshi Kurihara
• Kenji Baba
• Koichiro Kaneko
• Takayoshi Yarimitsu

Keywords:

• acoustic emission
• creeping discharge
• partial discharge
• XLPE cable

References:

[1] T. Sakoda, T. Arita, H. Nieda, K. Ando, M. Otsubo, and C. Honda,
"Studies of Elastic Waves Caused by Corona Discharge in Oil", IEEE
Transactions on Dielectrics and Electrical Insulation, Vol. 6, No.6, pp.
825-830, Dec. 1999.
[2] Y. Tian, P. L. Lewin, A. E. Davies, and Z. Richardson, "Acoustic
Emission Detection of Partial Discharges in Polymeric Insulation", High
Voltage Engineering Symposium, Conference Publication, No. 467, pp.
1.82.S23-1.85.S23, 1999.
[3] B. T. Phung, R. E. James, T. R. Blackbum, and Q. Su, " Partial discharge
ultrasonic wave propagation in steel transformer tanks", 7th International
Symposium on High Voltage Engineering, pp. 131-134, 1991.
[4] T. Sakoda, H. Nieda, and K. Ando, "Characteristics of Elastic Waves
Caused by Corona Discharges in an Oil-immersed Pole Transformer",
IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 8, No.2,
pp. 276-283, Apr. 2001.
[5] R. T. Harrold, "Acoustical Technology Applications In Electrical
Insulation And Dielectrics", IEEE Transactions on Electrical Insulation,
Vol.20, pp.3-19, 1985.
[6] Masanori Takaoka, Tatsuya Sakoda, Masahisa Otsubo, Shigeru Akaiwa,
Masatoshi Iki, and Shigeharu Nakano, "Studies of Elastic Waves in
Ethylene Propylene Rubber Using Acoustic Emission Sensor", IEEJ
Trans. FM, Vol. 128, No. 10, pp.641-645, Oct. 2008.
[7] H. Borsi, "Digital Location of Partial Discharges in HV Cables", IEEE
Trans. on Electrical Insulation, Vol. 27, No. 1, pp. 28-36, 1992.
[8] Tatsuya Sakoda, Toshihiko Nakashima, Masahisa Otsubo, Satoshi
Kurihara, Shinya Nagasato, and Takayoshi Yarimitsu: "Diagnostics of
Insulation Deterioration of Ethylene Propylene Rubber Using an Acoustic
Emission Technique", IEEE Transactions on Dielectrics and Electrical
Insulation, Vol. 17, No. 4, pp.1242-1248, 2010.
[9] Takuya Yamamoto, Toshihiko Nakashima, Tatsuya Sakoda, Masahisa
Otsubo, Satoshi Kurihara, Shinya Nagasato, Takayoshi Yarimitsu:
"Studies on Acoustic Emission Signals Detected in an Oil-immersed Pole
Transformer, Institute of Electrical Engineers of Japan Transactions on
Electrical and Electronic Engineering, Vol. 130, No. 11, pp. 1031-1036,
2010.