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High-voltage bushings are critical components whose failure can have serious consequences.

Thermal and electrical stress, ambient conditions, and more are putting high demand on bushings. Because of the high electrical stress levels in bushings, failures in oil-impregnated bushings with porcelain insulators tend to result in sudden and catastrophic failure of an explosive nature.

Condition assessment and replacement of defect bushings, therefore, drastically reduce the risk of transformer failures. Certain types and applications may have a higher risk which is yet another reason for condition assessment. Knowing the health of your bushings allows you to take planned precautionary actions in time, be it in maintenance or replacement – all with the purpose of keeping your transformer reliable and online, supporting your network.

Little maintenance is required other than checking the oil level (if applicable), power factor and capacitance testing, and checking the condition of the top terminals. Bushings exposed to salt spray, concrete dust, and other abnormal deposits are subject to a special hazard and must be cleaned regularly to prevent flashover and corrosion of parts.

Oil-filled bushings may be considered for exchange to dry-type with composite insulators to reduce the consequences of failures and the need for maintenance. Repair of high-voltage condenser bushings is normally not economically justifiable. However, exceptions exist.

Hitachi Energy's offering includes installation, preventive maintenance, condition assessment as well as replacement or upgrades.

Bushing Replacements for Hitachi Energy Transformer Service

Transformer Component Upgrades

Transformers component upgrades are based on Hitachi Energy's decade-long experience in manufacturing and maintaining its products.

Tap-changer Overhaul and Upgrades

Hitachi Energy offers the best resource for all tap-changer service requirements and covers services ranging from documentation, design engineering, the latest testing and oil processing, and providing 100% OEM grade parts and life extension kits.

Cooling System Overhaul and Upgrades

Hitachi Energy offers one-to-one replacements and upgrades of existing cooling solutions from original size to large size transformers.


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Transformer service

Aging assets, rising energy demand, and the critical need to avoid unplanned outages are challenging worldwide utilities and industrials. The service portfolio of Hitachi Energy allows utilities and industrials to maximize the return on transformer assets by ensuring high reliability, reducing life cycle costs, and ensuring optimized performance while lowering environmental impact.
Hitachi Energy Power Transformers


Hitachi Energy offers distribution and power transformers, Dry-type and EconiQ™ Transformers as well as services, for industrial and commercial applications.