The transformer oil laboratory is equipped with the latest test equipment to screen new as well as in-use transformer oil of both mineral and silicone type. It is certified to ISO/IEC 17025 standard for chemical and biological testing and is as established as the transformer plant itself, having been in continuous operation for > 30 years. Besides testing for our own transformers, we also perform tests of other makes both in Singapore as well as from overseas. Its function is analogous to that of a blood test laboratory in that a sample of blood can reveal the health condition and abnormality of a person, but in this case that of a power transformer from its oil.
Dissolved gas analysis (DGA) for oil transformers
For Mineral & Silicone Oil Transformers
The Dissolved Gas Analysis (DGA) is a very efficient tool that helps to assess and monitor the condition of transformers by analyzing dissolved gases found in the mineral or silicone oil.
Through DGA, any abnormal condition in transformers can be detected. It can give a warning about an impending problem, facilitate an early diagnosis and increase the chance of finding an appropriate remedy. Other benefits of DGA include the prevention of major failures of transformers, monitoring of overloaded transformers and convenient scheduling for transformer repairs.
Our dissolved gas analyzer can process 12 mineral and silicone oil samples sequentially. In total 9 dissolved gases are monitored
Transformer oil characteristics tests
We also perform oil characteristics tests which complement the DGA in evaluating the internal conditions of a power or distribution transformer. The oil characteristics tests complement the DGA in evaluating the internal conditions of a power transformer. It is highly recommended to perform these oil tests together with DGA.
This gives an indication of the water content in the paper insulation material. Overly high water content in the paper will adversely affect the ageing process of the paper, leading to irreversible damage that may cause an electrical breakdown in the transformer. Water is produced through oxidation of the oil as well as the paper.
2. Volume Resistivity
Volume resistivity is very sensitive to various contaminants and ageing materials.
3. Dielectric Strength
This is a measure of the ability of the insulating oil to withstand electrical stress. The level of breakdown voltage is dependent on both the water and particle contents in the oil. Water and particles are created when oil and paper deteriorate.
4. Total Acid Value
This value indicates the acidity of the oil. An elevated or increasingly elevated value indicates that the oil has started to oxidize. Acids also promote the degradation of the paper insulation (catalytic action).
The oil characteristics tests complement the DGA in evaluating the internal conditions of a power transformer. It is highly recommended to perform these oil tests together with DGA.
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