Tanking & Erection process _
Dried out CCA very first proceed for tightening before application of hot Oil shrinkaging for 24 hours. The oil shrinkaging process avoids looseness of active parts during it’s service at site. At last uniform pressing is done on CCA. High mechanical rigidity is achieved by hydraulic pressing at circulated force and tightening all pressure screws. Pressed CCA is put in to the tank with proper locating & locking arrangements which is prime important to achieve high resistivity against transient damage ,vibration during service and Forces develop during fault occurrence. The dried CCA is boxed up in pre fabricated MS tank.
After completion of CCA insertion in tank, hot, degassed oil is then allowed into the transformer tank under vacuum. This oil is then circulated through the transformer and the oil degassing plant until all gas trapped in the core, windings, and the insulation is removed. This ensures a high degree of stability in the insulation structure and early attainment of its mature condition, which would not otherwise be achieved until the transformer had been in service for some time.
The transformer is made ready for testing after assembly of bushings , conservators, radiators & all other protective devices .All the joints are gasketed to avoid leakage with the help of rubberized cork sheets/Nitrite Rubberized O-Ring , which can withstand high oil temperature and do not deteriorate nor contaminate oil in its contact.
Short Circuit withstand capability is always stand as a big challenge for any designer. In order to prevent deformation when subjected to short circuit forces, the windings are axially and radially supported. Solid block end insulation, adequate number of spacer rows and anchoring and bracing tapes, backed-up by substantial supporting frames are utilized. The axial end thrust under fault conditions is minimized by the suitable distribution of ampere turns over the length of the windings, and by ensuring that the design dimensions are closely adhered to during manufacture.
Contact : Atlanta Electricals Pvt. Ltd. Plot No. 1503/4, GIDC Estate, Vitthal Udyognagar - 388121. (VIA-Anand) Gujarat, India. | Phone : (02692) 235023 / 237185 | Fax : (02692) 237203