• Electrical India
  • Jan 5, 2017

If we look at the huge costs of maintenance, repairs & replacements for oil type transformers spent every year, then the differential cost between oil type and dry type transformers should not be a too big amount, if it helps reduce transformer failures…

  • Electrical India
  • Jan 5, 2017

To aid in the organization of a corporate or personal library, Megger is introducing a comprehensive series of Transformer Life Management bulletins that broadly cover the fundamentals of managing the life of a transformer...

  • Electrical India
  • Jul 5, 2016

Technical losses in Distribution Transformers (DTs) occur because of the physical nature of the equipment and infrastructure of the power systems, i.e., I2R or copper loss – in the conductor cables, transformers, switches etc., High Technical Losses (No Load & Load losses) persist in DTs of all major utilities across India – and their losses are very high when compared to the Ideal losses for the same capacity...

  • Electrical India
  • Jan 5, 2016

Since oil does not come in contact with external air, there is hardly any deterioration of oil over a period of time and hence such transformers are virtually maintenance free...

  • Electrical India
  • Jul 5, 2015

Due to use of better grade materials and optimum design, sudden failures are reduced along with lower cost of maintenance, leading to increased life expectancy. These benefits add up and balance against the inevitable increase in purchase cost – as additional copper in the windings and better materials in the core will be used in the manufacture of high efficiency transformers...

  • Electrical India
  • Jun 5, 2015

This article examines the need for careful preparation of the vessels used in the testing of transformer dielectric fluids to ensure that reliable results are achieved. It discusses the factors that most commonly lead to unexpectedly low values for dielectric breakdown, and it gives practical information about techniques that will help in eliminating moisture and other forms of contamination…

  • Electrical India
  • Mar 5, 2015

Efficiency programs of most of the governments are focusing on reducing the energy losses in the distribution network, and for some of them even give metrics for these improvements. A big amount of these losses is coming from the distribution transformers and the manufacturers are encouraged to improve the efficiency of their designs. These improvements are often managed with the use of better materials and then increase the costs of the transformers.

  • Electrical India
  • Mar 5, 2015

Not every transformer needs a multi-gas DGA device giving results every few hours, often needing lab checks at the same time. The combination of a Delphi Mini and Delphi Portable provides powerful real time monitoring, giving a composite value for the key gases of interest covering all faults, with rapid 'back up' from the Delphi Portable on site!