Saturday, November 20, 2010

3G Bonanza in India

India is all set to migrate to 3G networks. BSNL has already offered 3G service to their customers. The Indian common public is enjoying 3G services through BSNL. For availing BSNL 3G service one have to get a new 3G SIM card that is available for free now. From the Diwali this year the Tata Docomo also offered 3G service to all their customers. Customers can use their existing SIM Card and they don’t have to change the SIM Cards to receive 3G Service. IDEA has won 3G spectrum license in 11 circles and expected to roll out 3G services in first quarter of 2011.The operator is also campaigning about MNP or Mobile Number Portability. No tariffs or exact launch date yet from Sir Ji ! Aircel users might have to wait till 2011 to experience 3G . But January 2011 is not too far away. Aircel recently launched 3G experience zones in Chennai.

Thursday, November 4, 2010

Tests to determine the qualities of Transformer oil

Transformer oil is mineral insulating oil derived from crude petroleum. It is a Mixture of various hydrocarbons. It consist partly aliphatic compounds with the general formula C H2(12 and C H2. It is important to check the condition of oil periodically to ensure safety of transformers. The following tests are used to access the condition of a transformer!

  1. Dielectric Strength
  2. Water Content
  3. Neutralization Value
  4. Interfacial Tension
  5. Dielectric Dissipation Factor
  6. Test for Corrosive Sulphur in Oil
  7. Test for Oxidation Stability
  8. Specific Resistance (Resistivity)
  9. Flash Point
  10. Pour Point
  11. Viscosity
  12. Sludge Test
  13. Dissolved Gas Analysis (DGA)

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