Transformer Monitoring and Diagnostics

Need to know condition of transformers in electricity networks is increasing when transformers are ageing. Up to date and accurate monitoring data is needed in particular from large and critical transformers. Such transformers are usually located in the transmission networks, heavy industry and power generation.

Analysis of a transformer oil sample by a laboratory is an established technique recognised as the most important test for monitoring power transformers. It has long been accepted that Dissolved Gas Analysis (DGA) of oil is the single most powerful tool in the field of transformer fault detection and asset management.

While on-line DGA is now widely accepted as the most effective method of assessing the condition of a transformer, it does not cover all the possible sources of issues. Sub-systems like the tap changer, the cooling system or the bushings can generate their own problems if they are left unmonitored.

GE’s line of Kelman, Hydran and Intellix products, now has a comprehensive offering of portable, on-line products and software for management of critical transformer assets. With these products transformer faults can be detected in early stage minimizing risks for costly unplanned outages and equipment failures.