Online Measurement of Surface Electric Field Distribution of SiC Stressª²Grading Coating
Based on Electroluminescence
Ning Shufan£¬Yu Xinzhe£¬Xu Yang£¬Chen Wei£¬Liu BinChen Shoutian
£¨State Key Laboratory of Electrical Insulation and Power Equipment£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an
¡¡710049£¬China£©
Abstract£ºThe property that SiC electroluminescent intensity is enhanced with an increase
of electric field motivates to propose a novel method for online detection of surface
electric field distribution in the SiC stressª²grading coating£® The electric field
distortion on the measurement spots is minimized by the insulated plastic optical fibre as
the probe collects the electroluminescence of the SiC stressª²grading coating£® The selfª²designed
measuring system primarily contains opticalª²electrical converter£¬ signal amplifier and
signal processing unit£® The relation between the peakª²peak values of the
electroluminescence signal and the electric field of special spots of the stressª²grading
coating follows the logarithm law£® When the method is applied to one and three orders
SiC stressª²grading coating£¬ the measured values agree well with the calculated ones on
the various spots£¬ indicating the accuracy and reliability of this method£®
Keywords£ºSiC stressª²grading coating£» electroluminescence£» electric field
distribution£» online meª²asurement