Brochure · EN — Siemens Energy brochure for CAREPOLE, the pole-mounted dry-type (cast-resin) single-phase overhead distribution transformer: cycloaliphatic-epoxy cast windings and enclosure for weather and corrosion resistance, 25+ year expected lifetime, maintenance-free operation, direct drop-in replacement for liquid-filled overhead distribution transformers via identical brackets, optional Sensformer digital monitoring, single-phase power range 10 kVA to 100 kVA at up to 36 kV, and IEEE C57.12.01 / C57.12.20 / U.S. DoE efficiency compliance. The brochure carries no detailed per-rating data table — ratings are given only as the ranges quoted here.
The pole-mounted dry-type CAREPOLE offers many benefits which make your power distribution grid safer and more environmentally friendly. Optimally protected by its cast-resin enclosure against harsh environmental and climate conditions, this maintenance-free transformer, with an expected lifetime of 25+ years, ensures reliable operation while reducing total costs of ownership.
CAREPOLE has a robust mechanical frame structure and is cast with cycloaliphatic epoxy resin. This ensures high weather and corrosion resistance. CAREPOLE is suitable for outdoor applications and withstands environmental hazards. The frame also serves as a lifting and fastening mechanism for the transformer. A special manufacturing process and advanced sealing compound ensure a perfect core protection and low-noise operation.
The windings are cast with cycloaliphatic epoxy resin under vacuum, separated from the core. The cast-resin insulation is solid and resists the dielectric loads in the distribution network. It prevents moisture from penetrating the windings and thereby reduces transformer aging. CAREPOLE can also withstand higher temperatures than liquid-filled transformers due to the thermal class of the solid insulation. As a result, CAREPOLE units can be overloaded for longer periods of peak demand.
The winding insulation surface is in direct contact with the ambient air and has an efficient natural heat exchange, which ensures low aging: the lifetime of CAREPOLE is 25+ years. The innovative technical design makes CAREPOLE especially reliable and robust.
CAREPOLE units are maintenance-free. Servicing is limited to checking the vegetation conditions and wildlife management. This all helps to reduce the total cost of ownership.
Installation and grid connection could not be easier. Liquid-filled overhead distribution transformers can be directly replaced by CAREPOLE due to identical brackets. CAREPOLE has identical mechanisms for fixing to the pole, and has been specifically developed for urban, rural or coastal outdoor installation. CAREPOLE can be mounted at any angle and, after installation, immediate energizing is possible.
CAREPOLE makes your power distribution grids safer and more environmentally friendly because the units operate without flammable oil-based insulating fluids, and therefore require no tank. The cast resin, used as insulation and for the body of the transformer, has excellent electrical and mechanical properties, and is self-extinguishing.
The absence of insulating fluids means that CAREPOLE does not pose any risk to water sources or nature reserves caused by oil leaks, tank explosions or fires in the event of a fault. Moreover, thanks to the high efficiency of CAREPOLE, CO2 emissions are minimized and the transformer's long lifetime reduces resource consumption.
CAREPOLE is part of the digital Siemens Energy Sensformer portfolio: your unit can be ordered as Sensformer.
Operational data is transmitted via a smart and robust IoT gateway, using end-to-end encryption, to a storage and visualization platform. Loading information allows you to make better decisions and optimize the management of the grid, resulting in greater flexibility and more economic operation. The temperature status can always be checked, and a life consumption view provides information on the residual lifetime of the transformer.
Information is available any time and anywhere. Thanks to these digital features, failures can be localized and rectified as quickly as possible, or often even avoided by identifying operational irregularities at an early stage. This level of transparency helps to further increase the reliability of your distribution grid.
Fidelity note: page 3 carries an unanchored footnote '1) Available soon'; the brochure does not indicate which feature on the page it qualifies.
The brochure's benefits panel groups CAREPOLE's advantages into three categories, reproduced verbatim below.
| Category | Benefits |
|---|---|
| Increased reliabilty (sic) | Long lifetime; fewer outages; high overload capability; weatherproof and climate-proof design; digital monitoring to improve grid management |
| Enhanced safety and environmental friendliness | Minimized resource consumption and CO2 emissions; no water or soil contamination; high level of fire safety — self-extinguishable; no explosion risk; high short-circuit withstand capability |
| Reduced total cost of ownership | Long lifetime of 25+ years: no replacement costs; maintenance-free units: no maintenance costs; small in size: lower storage and installation costs; reduction of technical losses (due to amorphous core); energy theft protection due to digital monitoring |
Page 4 opens with an annotated cutaway of the CAREPOLE unit, calling out seven design elements (transcribed verbatim from the callout labels; this text is rendered in the graphic and does not appear in the PDF text layer).
| Design element | Callout text |
|---|---|
| Off-load tap changer | Can be provided on top of the high-voltage bushing, if required, developed and patented by Siemens Energy |
| Windings | Cast with epoxy resin under vacuum |
| Wound core | With high-quality electrical steel or amorphous |
| Bracket | Same as conventional transformer |
| High and low voltage bushings | Cast in one piece with the windings |
| Outside epoxy resin | Has a high mechanical strength and is fit for outdoor applications |
| Frame | Creates a solid mechanical structure and protects the core against corrosion |
Ratings: CAREPOLE is available in the single-phase power range from 10 kVA to 100 kVA. The transformer offers a maximum voltage capacity of 36 kV, and can be equipped with a tap changer with up to 5 positions, one or two high-voltage bushings and other accessories typical for overhead distribution transformers (e.g. surge arresters). Honest-thin note: these ranges are the only ratings in the brochure — it contains no per-rating data table (no impedance, losses, weights or dimensions).
Accessories: CAREPOLE is equipped with the following accessories: surge arrester (on request); lifting lugs; mounting bracket; transformer ground connector; low-voltage ground (on request); sensors and smart IoT gateway (on request).
Main standards: CAREPOLE transformers meet the product requirements of the following standards: IEEE C57.12.01 "Standard for General Requirements for Dry Type Distribution and Power Transformers"; IEEE C57.12.20 "Standard for Overhead Type Distribution Transformers 500 kVA and Smaller: High Voltage, 34,500 V and Below; Low voltage, 7,970 / 13,800 Y V and Below" (where applicable); efficiency in accordance with the U.S. Department of Energy (DoE); other requirements as dictated by your standards.
Published by Siemens Energy Global GmbH & Co. KG, Transmission, Freyeslebenstr. 1, 91058 Erlangen, Germany; for the U.S. published by Siemens Energy, Inc, Transmission, Raleigh, NC, USA. © Siemens Energy, 2022. Subject to changes and errors; the requested performance features are binding only when they are expressly agreed upon in the concluded contract.
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