More stressful functioning of transmission systems has influenced the necessity of new higher rated and more efficient power transformers. Issues like loss reduction, environmental, costing, and reliability for power transformers are all under pressure, with efforts to negotiate operating costs and manufacturing expenses while increasing reliability. In this article, current transformer manufacturers (L.T) will talk about development in configuration, insulation, conductors and more in detail.
Configuration includes asymmetric cores, mixed material – non uniform losses, and overlap joints. Let’s discuss each of them in detail now.
Asymmetric cores – constructing the core from laminations lets the core shape to be distinct ranging from circular to asymmetric shapes.
Mixed material- Where losses vary in the cores of transformers, distinct grade of steel is used for distinct part to cut down the costing, high quality low loss for high loss areas, and more inexpensive grade for low loss areas.
Overlap joints – Joints occur at the intersection of limbs and corners of the transformer core. Losses are greater as the flux path between elements gets reduced and designs are made for reducing flux levels at joints.
The noise produced by the transformer is still a prime issue and to reduce the noise level, manufacturers follow these tricks-
- The reduce core flux density that results in bigger cores
- They reduce magnetostriction affects
- They perform resonance analysis of both the tank and the core to find natural mechanical resonant frequencies.
Conductors – Power transformer manufacturers use flat enameled copper of several profiles based on the type of winding used in the equipment. The conductors can be combined in bundles before winding. Conductors combined in bundles can encounter issues with circulating currents. To cut down these issues, such conductors are transposed, inner to outer, regularly in intervals.
Insulation – Manufacturers use cellulose based insulation tape and boards in the transformer windings. Major developments in insulation are-
- High temperature insulation
- High strength paper tape
- Laminated pressboard
Oil insulation includes natural esters and gas to liquid oil.
Manufacturers and maintenance services providers have enhanced their maintenance routines with online monitoring equipment technology. A lot more is still coming for the users and manufacturers. For more updates, you can subscribe the official blog of Current Transformer Manufacturers (L.T). For any query, just write your thoughts in comments section and share it with all our readers. You may get expert response from the professionals as well.