Feasibility of a MEMS Sensor for Gas Detection in HV Oil-Insulated Transformer
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Feasibility of a MEMS Sensor for Gas Detection in HV Oil-Insulated Transformer
- 2. MEMS SENSOR FOR GAS DETECTION IN HV OIL-INSULATED TRANSFORMER ABANEESH.V S7 AEI ROLL NO:1 GUIDED BY RAMYA SANALKUMAR Asst Professor ECE Dept
- 3. ABSTRACT Protection of oil-insulated transformers, using a MEMS sensor. MEMS device is immersed within the insulating fluid. Utilizes relative differences in the velocity, pressure, and flow rate of fluid.
- 4. INTRODUCTION Oil inside a transformer undergoes relatively rapid decomposition, depending on fault type or overload conditions. The decomposition generates small amounts of gas molecules at high velocities and at relatively higher pressure and temperature than the surrounding oil. Uses a MEMS sensor consisting of multiple micro turbines centrally shafted to a micro generator.
- 5. WHAT IS MEMS? MEMS : Micro Electro Mechanical System. 1micrometer(µm) to 1millimeter(mm), (1mm=1000µm). A MEMS is constructed electromechanical or electrochemical means.
- 6. MEMS SENSORS Mems sensors are used to measure many physical quantities. It provides a usable energy output according to a specific input. It includes sensing element & signal processing hardware. Includes automatic calibration, signal reduction, compensation, correction.
- 7. SUBJECT STUDY WORKING OF TRANSFORMER SENSOR PLACING PRINCIPLE OF SENSING
- 8. GAS PRODUCTION The gas is primarily produced by the chemical and physical decomposition. The velocity of the gas bubbles can range between 0.1 and 0.5 m/s. The amount of gas produced drastically increases the risk of a transformer explosion. Δ t = 1.83Rm√ρ/P
- 9. DESIGN AND WORKING OF THE PROPOSED MEMS SENSOR The MEMS encapsulate should have a closely matched permittivity to the operational ratings of the oil and winding insulation. The advantage of using a MEMS-based sensor is to provide miniature features allowing it to span only one to two windings and be mounted on the windings.
- 10. MEMS Device
- 11. MEMS Transducer Turbine Gearing Generator Turbine Gearing Generator RF transmitter
- 12. MEMS turbine &generator Mems turbine
- 13. Working Principle The principle that the gas bubble present in oil has higher temperature, pressure, and velocity than the surrounding oil. The Young–Laplace equation Δ P = σ((1/R1) + (1/R2))
- 14. OVERALL DESIGN SPECIFICATIONS Sustained transfer of energy is the critical step in the sensing of abnormal changes in the transformer. Combined with the possibility of relatively large fluid flows, the turbine sensing method is preferred over most other MEMS flow-rate measurement.
- 15. ADVANTAGES Flow rate can be measured. We are possible to create 3-D images of the transformer. We can analyse individual spots of degrading insulation & of over loading conditions. The measurements are accurate.
- 16. DISADVANTAGES The voltage range of the transformer is very limited. Continuous monitoring is needed.
- 17. SCOPE OF THE SYSTEM Uncontrolled transient fluidic flow measurement in open oil systems is recognized as a challenging field of research.
- 18. CONCLUSION Feasibility of using MEMS sensors to detect energy levels in gas generation from several fault scenarios. Specific designs of existing MEMS sensors that have related functionality have been identified. Critical aspects of their designs have been discussed along with specific energy ranges of their operation.