山本 修平

Filtration elements are components within a filter that trap contaminants. They function by:

Surface Filtration: Capturing particles on the filter’s surface.
Depth Filtration: Entrapping particles within the filter media.
Adsorption: Attracting and holding particles through molecular forces.
Magnetic Attraction: Using magnetic fields to remove ferrous particles.
Materials used include cellulose, synthetic fibers, metal meshes, and magnets, each tailored to specific contaminants.

Modern methods for oil testing include advanced diagnostic techniques like Dissolved Gas Analysis (DGA) using gas chromatography to detect trace levels of fault gases. Fourier Transform Infrared Spectroscopy (FTIR) identifies chemical compounds indicating oil degradation. Dielectric Frequency Response (DFR) assesses insulation properties over a range of frequencies. Moisture content is measured with precision sensors. Some methods involve online monitoring systems that provide continuous data on oil condition, enabling real-time analysis and predictive maintenance strategies to optimize transformer health and performance.

Methods include:

Filtration: Removing solid particles using fine filters.
Centrifugation: Separating contaminants based on density.
Vacuum Dehydration: Eliminating water and gases under reduced pressure.
Adsorption: Using materials like activated alumina to remove acids and oxidation products.
Electrostatic Separation: Removing sub-micron particles using electric fields.
These methods restore oil properties and extend service life.

In agriculture, zeolite offers several benefits when used with dry cows (cows not currently lactating). It can improve feed efficiency, reduce ammonia emissions, and aid in controlling moisture and odors in bedding. Zeolite acts as a binder, trapping ammonia and reducing nitrogen loss, which enhances nutrient retention in the cow’s digestive system and contributes to better manure quality for fertilization. It also helps absorb excess moisture in bedding, improving animal comfort and hygiene.

In experiments, the dielectric strength of transformer oil is typically tested using a flash test or breakdown voltage test, where a standard tester like the Globecore oil tester is utilized. The oil sample is placed between two electrodes under controlled conditions, and a voltage is gradually applied. The moment the dielectric breakdown occurs, indicated by a spark or flashover, the voltage level is recorded. This value is compared to established standards to assess the oil’s insulating properties. The test is crucial for ensuring the reliability and safety of transformers, as it helps determine whether the oil can effectively act as an insulator under operating conditions. Regular testing of dielectric strength of transformer oil is essential to maintain optimal performance and prevent failures in electrical systems.