Design of double plate capacitive sensor for noninvasive voltage measurement
Traditional single electrode capacitive probe has large measurement error,and the measurement precision is easily affected by temperature,humidity and other environmental factors,while non intrusive voltage measurement sensors can be used to detect the voltage in power transmission lines and electrical equipment without directly contact with live conductors or equipment.So,a non-contact voltage measurement method with dual capacitors based on capacitive coupling is proposed.The measuring system is designed and manufactured.The tests are carried out in a laboratory facility.The experimental results show that the developed sensor has good precision and linearity.The ratio error under power frequency is within±1.7％.In addition,it also has the advantages of low cost,miniaturization,flexible shape,and easy adjustment of partial pressure ratio.
non-contact typevoltage measurementdouble capacitorelectric field coupling
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