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An Electric Field Meter And Temperature Measurement Techniques For The Power Industry

Three types of sensors are discussed which take advantage of the dielectric properties of optical fibers to measure electric field and temperature in electric power systems. An electrically isolated de electric field sensor is described, and analytical and experimental results related to free space field measurement in the presence of space charge currents are presented. Accurate measurements can be made over a dynamic range of 105, and errors less than 10% are observed in space charge environment. A simple, all dielectric fiber electroscope for measurement of high intensity ac fields is briefly described. Concepts for distributed temperature sensing along the length of a power conductor are proposed and constraints due to optical power limitations in an OTDR readout are presented.