Siemens to provide Con Edison with mobile resiliency transformers

Siemens is providing Con Edison, the utility that powers New York City and local areas, with six mobile resiliency transformers to help replace units within days rather than weeks in times of extreme weather like hurricanes or other major substation events.

The mobile resiliency transformers will allow Con Edison to respond to these events where multiple transformers may be impacted and normal spares or system redundancy may not be able to address the issues.

The new transformers are highly optimized for weight and dimension through advanced voltage, power rating, impedance, and environmentally-friendly ester fluid technology. This solution will help Con Edison quickly restore power to the areas served by the unavailable transformers within one to three days, compared to the weeks it may take to transport and install normal available spare units. In cases where utilities do not have existing spare units, it may take six to 12 months for new units to be procured, shipped and installed.

Siemens’ new mobile resiliency transformers are designed to be as mobile as possible to minimize local transportation and installation requirements. In addition, the transformer design includes pre-installed cooling systems and operation on multiple voltage levels. This versatility results in utilities needing fewer mobile resiliency banks that can be used in several different locations.

Special plug-in bushings and connections reduce installation time to approximately one to two days, without transformer entry and oil handling, instead of weeks.

The transformers are designed for usage for different voltage levels which allows a utility to avoid investing in a resiliency unit for each transformer rating. To minimize the size and weight of the transformers, high temperature insulation material, forced oil cooling equipment, and ester fluid are used. By insulating with environmentally- friendly synthetic ester that easily dissipates, the transformers for Con Edison can also be installed closer to rivers or other environmentally conscious areas.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at

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