NDLI: Highly sensitive thin-film capacitive sensor for online moisture measurement in transformer oil

Content Provider	IET Digital Library
Author	Islam, Tarikul Tehseen, Zeba Kumar, Lokesh
Abstract	This study describes a low-cost sensor-based scheme for online moisture measurement in transformer oil. Considering a harsh environment, moisture measurement of oil at ppm level is challenging, so the sensor should be highly sensitive and thermally and chemically stable. The conventional methods are mostly offline, have long test times and are costly. A thin-film parallel plate capacitive moisture sensor has been fabricated using inexpensive materials to measure the moisture of fresh, aged and 0.5% water content oil samples. The moisture sensing film is highly hydrophilic and is made of alumina oxide, a very stable material. Experiments were conducted to determine the response parameters of the sensor in the presence of moist nitrogen gas, the concentration of which was measured by a commercial SHAW dew point meter. Experiments were also performed to measure the moisture of different oil samples in the laboratory. Results show that the output of the sensor is sensitive (6 pF/ppm moisture), has negligible hysteresis (∼1% at 1 kHz) and has fast response and recovery times (T res = 70 s, T rec = 170 s).
Starting Page	416
Ending Page	422
Page Count	7
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 4, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2019.0319
Journal	IET Science, Measurement & Technology
Publisher Date	2020-01-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Al2O3 Alumina Capacitance Measurement Capacitive Sensor Commercial SHAW Dew Point Meter Electrical Instruments And Technique Frequency 1.0 KHz Highly Sensitive Thin-film Capacitive Sensor Humidity Measurement Hydrophobicity Hygrometry Impedance And Admittance Measurement Inductors And Transformer Moisture Measurement Moisture Sensing Film Online Moisture Measurement Organic Insulation Sensing And Detecting Device Sensing Device And Transducers Thermal Stability Thin Film Sonsor Thin-film Parallel Plate Capacitive Moisture Sensor Time 170.0 S Time 70.0 S Transformer And Reactors Transformer Oil Water Content Oil Sample
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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