Transformers are critical to electrical power systems and grids. Their reliability and availability is the key to profitable power generation and transmission. Therefore, the continuous online evaluation of transformer dielectric condition, operation and performance is essential and especially after the new development of sensor and computer technology.

Online monitoring system is also found to reduce maintenance cost, extend life time of the transformer, enhance overload capability, detect faults, and avoid unexpected transformer failures and gird blackout.

The purpose of this paper is to introduce the most recent online condition monitoring systems available in the market and applicable for oil and gas industry.

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