---

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

Year: 2012 Volume: 6 Issue: 9 1068 - 1073 Pages

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

Abstract: 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.

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

Artificial Accelerated Ageing Test of 22 kVXLPE Cable for Distribution System Applications in Thailand

Year: 2010 Volume: 4 Issue: 5 761 - 766 Pages

• Authors:
• A. Rawangpai
• B. Maraungsri
• N. Chomnawang

Abstract: This paper presents the experimental results on artificial ageing test of 22 kV XLPE cable for distribution system application in Thailand. XLPE insulating material of 22 kV cable was sliced to 60-70 μm in thick and was subjected to ac high voltage at 23 Ôùª C, 60 Ôùª C and 75 Ôùª C. Testing voltage was constantly applied to the specimen until breakdown. Breakdown voltage and time to breakdown were used to evaluate life time of insulating material. Furthermore, the physical model by J. P. Crine for predicts life time of XLPE insulating material was adopted as life time model and was calculated in order to compare the experimental results. Acceptable life time results were obtained from Crine-s model comparing with the experimental result. In addition, fourier transform infrared spectroscopy (FTIR) for chemical analysis and scanning electron microscope (SEM) for physical analysis were conducted on tested specimens.

• Keywords:
• Artificial accelerated ageing test
• XLPE cable
• distribution system
• insulating material
• life time
• life time model