Dear All,
Please let me know, a general figure for the moisture content in paper(in %) for a new small distribution transformers of voltage rating 33kV or less. Ideally it seems 0.5%, but is this practically the case? Some standards mentioned less than 3% is required for transformers below 56KV...
Dear All,
For "class A" insulation the thermal limit is specified in standards as 105 degrees of Celsius. Distribution transformers are made with "class A" insulation. But,IEC 60076-7 standard for transformers, takes 110 degrees as the temperature which corresponds to a relative aging rate of...
Dear All,
If we have to consider the effect of solar radiation into account during the temperature rise test of a 250kVA hermetically sealed distribution transformer, how this can be done? Should we feed additional losses during the test? How to calculate these additional losses? Is there any...
