WANG Can1, WU Fei-fei2. Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC[J]. 2011, 31(1): 14-18.
WANG Can1, WU Fei-fei2. Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC[J]. 2011, 31(1): 14-18.DOI:
traditional DC transducers cannot satisfy measuring requirement of EHV DC.Because of the advantages such as anti-electromagnetism interference
small physical volume and no saturation
the optical current transducers(OCT) based on Faraday effects principle will take place of the conventional current transducers to be employed in the current measurement of the electric power system in the future.But many disadvantages has obstructed the practical turn of OCT for a long time.In this paper
a method to improve the signal/noise ratio(SNR) is discussed and the SNR characteristics of OCT is analysed.The application method to enhance precision for lock-in-amplifier(LIA) based on correlative detection theory is put forward