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Related Concept Videos

Instrument Transformers01:23

Instrument Transformers

325
Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
325

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Related Experiment Video

Updated: Nov 12, 2025

Iridium Oxide-reduced Graphene Oxide Nanohybrid Thin Film Modified Screen-printed Electrodes as Disposable Electrochemical Paper Microfluidic pH Sensors
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A Highly Sensitive and Stable rGO:MoS2-Based Chemiresistive Humidity Sensor Directly Insertable to Transformer

Md Ridwan Adib1, Yongbum Lee1, Vijay V Kondalkar2

  • 1Department of Electrical and Computer Engineering, Ajou University, Suwon, Gyeonggi-do 16499, South Korea.

ACS Sensors
|March 17, 2021
PubMed
Summary
This summary is machine-generated.

A new humidity sensor using reduced graphene oxide and molybdenum disulfide (rGO:MoS2) shows high sensitivity and stability in both air and transformer oil. This advanced sensor is ideal for real-time monitoring of power transformer operational status.

Keywords:
humidity sensorin-plane microheatermolybdenum disulfidereduced graphene oxidetemperature sensortransformer insulating oil

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Reduced graphene oxide (rGO) and molybdenum disulfide (MoS2) are 2D materials with high surface area and flexibility, suitable for humidity sensing.
  • Existing humidity sensors require further development for stability and real-time monitoring applications.

Purpose of the Study:

  • To develop a highly sensitive and stable humidity sensor based on rGO:MoS2 for monitoring transformer insulating oil.
  • To integrate the sensor with a microheater, temperature sensor, and custom electronics for real-time analysis.

Main Methods:

  • Synthesized rGO:MoS2 materials using ultrasonication without additives or heating.
  • Deposited materials on Ti/Pt interdigitated electrodes via drop-casting.
  • Analyzed sensor performance in air and transformer oil using custom interface electronics.

Main Results:

  • The rGO:MoS2 sensor demonstrated high sensitivity (0.973 kΩ/%RH in air, 1.596 kΩ/%RH in oil) and excellent linearity.
  • Achieved high stability with only 0.13% inaccuracy over 400 hours in air.
  • Showed stable repeatability in transformer oil within a specific RH range.

Conclusions:

  • The p-n heterojunction in rGO:MoS2 contributes to significant sensing capabilities.
  • The developed sensor system is a promising candidate for real-time monitoring of power transformer operational status.