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Main Transformer Leakage Repair

Analysis

Generally, oil-immersed power transformers are the most widely used type in China. Over the years, frequently occurred transformer oil leakage shortens its service life, causes danger to system security as well as seriously affects social and users’ economic benefit. In June 2015, technicians from Micava went to the hydro-junction for on-site repair of main transformer butterfly valve’ leakage, during which technicians found main reasons of leakage were due to the aging, fracturing and deformation of sealing pieces, whose quality depended largely on their oil resistance. Poorer oil resistance equaled to more fast aging, especially under high temp, which was extremely easy to cause aging, fracturing, deformation even failure of sealing pieces, eventually leading to transformer leakage.

Comparison

Traditional technologies: Sealing pieces replacement on the basis of power cut and oil drainage. However, the drained oil need to be injected only after treatment. Large cost and labor waste.

Micava technology: Field and effective repair with less down time and no harm to the equipment. Superior performance with good oil resistance and adhesive strength, being capable of solving leakage in static joint surface and porous welds. No downtime, no pressure relief, no power cut.

How to improve electrical equipment performance and ensure power system reliable service is urgent to solve in power generation. Transformation leakage’s timely and thorough treatment has become an important technical index in measuring electrical industry development. In recent years, Micava’s technologies in main and unit transformation leakage repair have provided guarantee for secure operation and ensured economic benefit for industries and users.

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