Abstract
A novel fiber-optic sensor based on the alternating electric field force actions on polyimide tubing with space charge for power-frequency electric field sensing is presented. In structure, the sensor consists of a lightweight fiber cantilever beam covered with a length of electrically charged polyimide tubing as the field sensing element. A twin-FBG based Fabry–Perot interferometer is embedded in this fiber beam to detect the beam vibrations excited by the force of power-frequency electric field to be sensed. Space charge in polyimide tubing is formed through a dielectric charging process. The basic concept, structure, fabrication and operation principle of the sensor are introduced with detailed theoretical analyses. The comprehensive experiments with two sensor prototypes are carried out, in which a sensor exhibits a high sensitivity of 173.65 μV/(V/m) with a minimal detectable field strength of 0.162 V/m, and another has a durability of continuous operation for over a year.
Highlights
In the power industry, the healthy conditions of a high-voltage (HV) power equipment, referring to voltages, currents, temperatures and electric field (E-field) strengths at power frequency (50 or 60 Hz) as well as vibrations and partial discharges, need to be monitored in real time [1,2,3,4,5,6]
For implementing the dielectric charging of PI tubing, we designed a jig as shown in Figure 2a, which consists of two copper blocks with V-grooves to hold PI tubing as an electrode and a wire inserted into PI tubing as another electrode
First of all, we will assess the dielectric charging effects of PI tubing samples, and demonstrate the sensor performances in various aspects
Summary
The healthy conditions of a high-voltage (HV) power equipment, referring to voltages, currents, temperatures and electric field (E-field) strengths at power frequency (50 or 60 Hz) as well as vibrations and partial discharges, need to be monitored in real time [1,2,3,4,5,6]. Several different types of E-field and voltage sensors based on electrical or optical detection schemes have been proposed and developed [7,8,9,10]. The electrodes usually were deposited directly on the device, which made these small-size (in millimeter scale) EO sensors must work in higher frequency ranges, e.g., in the RF range. It is obviously not suitable for E-field sensing in the power-frequency range. The MEMS E-field sensor usually needs a parallel, electrically grounded metallic electrode as a zero-potential reference.
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