Corona Discharge Detection Based on Extrinsic Fabry-Perot Interferometric Diaphragm Na-noscale Amplitude Recognition
To detect weak partial discharges and evaluate the severity of partial discharge,a novel corona discharge de-tection method based on acoustic-sensitive diaphragm nanoscale amplitude demodulation for an optical fiber extrinsic Fabry-Perot(EFPI)ultrasonic sensor was proposed.Firstly,an EFPI probe with a resonance frequency of 55.5 kHz was designed based on theoretical analysis.Then,the phase generated carrier arc-tangent algorithm(PGC-Atan)was investi-gated to demodulate the weak amplitude of the diaphragm.The EFPI ultrasonic sensor was constructed based on the EFPI and PGC-Atan algorithm,and its performances were verified by a single-point sound source and ignition pulse generator.The resolution of the EFPI ultrasonic sensor to the amplitude of the diaphragm can reach 0.43 nm,and it has good linear-ity of response and ultrasonic signal detection ability.Finally,the EFPI was installed into the experimental device to detect the air corona discharge,and 13.86 pC partial discharge magnitude was achieved.The relationship between the di-aphragm amplitude and the corona discharge development was established by Bootstrap small sample analysis.The experimental results indicate that the amplitude of the diaphragm increases exponentially with the discharge voltage,which is similar to the variation trend of the partial discharge magnitude with the voltage.The amplitude of the diaphragm is related to the severity of corona discharge.
国家科技期刊平台
NSTL
万方数据
