Medium voltage block for utility-scale applications

SMA's Medium Voltage Block is an integral part of the Utility Power System, and pairs seamlessly with SMA's new line of central inverters: the Sunny Central 1850-US, 2200-US and 2500-EV-US. The Medium Voltage Block is a simplified solution mechanically, based on the layout of a traditional ANSI pad mount transformer, with low-voltage connections positioned horizontally in plane with the output bus bars of the inverter. To enable this shorter connection scheme, the low-voltage connections have been relocated to the side of the medium-voltage transformer, in their own connection flange. All of the necessary installation hardware, including the busway, bus bars, grounding straps, connection hardware, and transformer monitoring cable sets, are included. These conveniently kitted components offer simplified field integration, requiring as little as one man hour, while eliminating the need for skid solutions. Engineered to minimize risk, the Medium Voltage Block has been fully type tested and validated at SMA's engineering facility to meet the needs of PV applications with a 25-year service life. Its space-optimized design with a 22% smaller footprint reduces shipping costs while fewer components and easy access maximize serviceability. Transformer monitoring, communicated through the inverter MODBUS registries, reports the health of the transformer, including analog values for temperature and pressure, which enables trend-based predictive maintenance that can considerably reduce O&M complexity.
 
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Volume: 2016 September/October