Abstract
Partial discharge detection has been widely used in the condition evaluation of crosslinked polyethylene(XLPE) cables as it can find the internal defects of cables in advance. The traditional partial discharge detection is greatly affected by the on-site environmental interference, so its development and application are subject to certain restrictions. Fiber optic sensing technology is resistant to electromagnetic interference and has good prospects for development. In this paper, a partial discharge test platform of XLPE cable is built. A specimen of XLPE cable terminal containing airgap defects is produced, and 70 turns of polarization maintaining optical fiber are build-in the XLPE cable terminal as the fiber optic sensor. The defect is a cylindrical airgap with a bottom radius of 1.5 mm and a height of 2 mm, located in the main insulation of the cable. The PD detection by fiber optic Mach-Zehnder interferometer is compared and analyzed with that by high frequency current transformer(HFCT). The test results show that fiber optic Mach-Zehnder interferometer sensing can detect the partial discharge at 11 kV-15 kV of the specimen, which is consistent with the HFCT detection results. The partial discharge acoustic wave is composed of a series of pulsed waves of different frequencies. A large percentage of fiber optic signals are low frequency signals. The number of pulse waves in the fiber optic sensing signal increases as the degree of partial discharge rises. The research results show that optical fiber measurement of partial discharge is an effective method, which can be used to carry out partial discharge detection of XLPE cables.
Published Version
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