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• Transformer Windings • HT And LT Terminations • MS Fbricated Tanks • Power Transformers • Distribution Transformers • Dry Type Transformers |
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TRANSFORMER WINDINGS: |
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Transformer windings are designed to meet three fundamental requirements such as mechanical thermal & electrical. They are cylindrical in shape & are assembled concentrically. The low-tension windings are of the helical type, single or multiplayer, using flat copper strips, depending upon the size & current rating of the transformer. The high – tension winding consist of paper covered round & strips conductors depending upon the current rating of the transformer. For higher capacity continuous disc winding are used .
Pressboard washers & spacers rigidly support the winding. Interlayer cooling ducts are provided to ensure that the temperature gradient between windings & oil hence the hot temperature is minimized & high life expectancy is achieved. Insulation between layers & Tums is based upon the impulse test level of the voltage class of the winding as specified in IS 2026. Completed core coil assemblies are dried are prior to impregnation with transformer oil. |
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WINDING CONNECTIONS:
Tapping & lead are run in multi paper covered flexible conductors in press board half tubes, the phase leads being separated from he tapping leads by adequate barriers. These tubes are rigidly based to ensure that clearances between leads & tank sidewall are maintained when the transformer is position. Low voltage leads being of larger cross section are sufficiently robust, so supports are provided wherever necessary.
ISULATION & IMPREGNATION:
The principle components of insulation are pre-fabricated from pressboard sheet. All items subjected to compression in services are preshrunk & the slight recovery in dimension after preshrink age is compensated for windings during final drying of the completed transformer. The oil used for impregnation complies with IS 335 & every consignment received at works is tested before entry is permitted into the storage tanks.
SHORT CIRCUIT STRENGTH:
In order to prevent deformation when subject to shot circuit force, solid blocks & insulation, backed by substantial supporting frames, are utilized. Ensuring that design dimension is closely adhered during manufacturing procedure minimizes the axial end thrust under fault condition. Transformers are designed & constructed in such a way that they are capable of withstanding the effects of short circuit testing. Our transformers have been type tested CPRI.
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