• Electrical India
  • Mar 27, 2017

Inrush current drawn by a transformer is expected to result in inadvertent operation of over-current protection system provided in electronic power supplies, and, therefore, is considered to be a special concern to power supply designers. In this paper, two low cost practical methods for reducing inrush current and a power supply for measuring the same are proposed. These methods are based on varying the location of winding and core window dimensions. Four line frequency transformers have been fabricated and evaluated with a view to demonstrating the effectiveness of these methods. A low cost controlled power switch has been developed to ener   Read More...

  • Electrical India
  • Jul 5, 2015

Collection of failure data is the first major task. In free repair service or in repair contract, very little effort is made by utilities to find out the root cause of failure, which could be one of the reasons why a damaged transformer is replaced by a new one without removing the cause of damage, leading to failure immediately or within a very short period...