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PPI Original Text (PPI-OT) – Landmark achieved in repairing extra high voltage power transformers

Lahore, May 23, 2012 (PPI-OT): WAPDA Power Transformer Engineering Services Unit (PTESU) of Pakistan WAPDA Foundation has achieved a landmark by reclaiming extra high voltage 515 kilovolt (KV) transformer in their Workshop.

The reclaimed transformer is now successfully operating and transmitting electricity to the National Grid. Such a colossal task of repairing high voltage power transformer was undertaken for the first time in the history of Pakistan. Besides building the in-house capacity, the said reclamation also helped save Rs.200 million – the cost of a new transformer.

The said transformer was originally installed at Barotha Power Complex where it developed a serious fault. The preliminary inspection at site revealed the burning and damage of tap winding, whereas the adjoining parts were also affected by the heating effect. Resultantly the transformer became inoperative.

Since the requisite facilities of reclamation and testing were not available at Barotha Power Complex, it was shifted to PTESU Workshop at Lahore where the engineers and staff, after discussing its design, modus operandi for repair, improvisation, testing and other technical problems unprecendently repaired this high voltage (about 2.3 times of previous voltage) transformer.

After the repair, the transformer was subjected to sensitive stage of different technical tests. Finally acceptance tests were witnessed by the team of Barotha Power Complex. The repaired transformer was shifted to Barotha Power Complex and installed at the generating unit. Till now, the transformer is functioning successfully.

In addition to repairing the said power transformer, the PTESU also successfully overhauled as many as six shunt reactors of 500 KV, 33 mega volt ampere reactive (MVAR) installed at 500 KV switchyard of Ghazi Barotha Hydropower Project. Earlier, it has decided to replace these reactors with the new ones. The repair of shunt reactors saved Rs.500 million, that would have been spent on procurement of new shunt reactors.

It is pertinent to mention that PTESU workshop is the only workshop of its type in the country, which has on its credit the reliable reclamation of all defective transformers. Since its inception about 30 years ago, it has considerably contributed in repair of a large number of transformers, saving a huge amount in the shape of foreign exchange.

For more information, contact:
Muhammad Abid Rana
Director Public Relations
Water and Power Development Authority (WAPDA)
G-32, WAPDA House, Lahore
Tel: +9242 9920 2633 and +9242 9920 2211 -2033 -2029
Cell: +92333 445 8293
Email: mabidrana@gmail.com

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