ABB is launching the solar industry's first fully optimized two-pole DC (OTDC) switch-disconnector for 1500V utility-scale photovoltaic power plants covering 315-630A IEC and 250-600A UL current range.
The new design offers both a size reduction and an increase in efficiency and performance to help manufacturers of PV combiner boxes, inverters, and energy storage systems adapt to the industry's rapid adoption of 1500Vdc solutions.
The two-pole 1500Vdc concept helps manufacturers improve system efficiency, reducing switch losses by up to 35 percent. Measuring just 150mm wide and 122mm high across the current range, the OTDC range of 1500Vdc switches is also up to 30 percent smaller than conventional solutions. The compact size of the new OTDC range makes it possible for manufacturers to reduce the size of combiner boxes and inverters.
Allen Austin, Market Development Manager for Renewables, Electrification Products division, said: "The new OTDC 1500Vdc switch-disconnector is another example of ABB producing innovative, further improved solutions that drive the market and help manufacturers make solar power more competitive and efficient.
"This solution brings together years of research and experience of making and breaking dc current and voltage. We expect it to quickly become the preferred solution," concluded Austin.
The shift from 1000V to 1500V systems is helping reduce the cost of utility-scale photovoltaic systems. Higher-voltage systems enable longer strings, which mean fewer combiner boxes and less wiring, making installations less labor intensive and reducing the cost per watt of installed power. By 2019, virtually all new utility-scale solar plants are expected to be 1500Vdc.
ABB's unique design makes it possible to operate up to two 1500Vdc strings with just one switch. In addition to the standard connections, the OTDC's modular design also makes it possible for ABB to fulfill the non-standard requests that come from the quickly changing solar market.
The OTDC range is a family of robust switch-disconnectors, designed for photovoltaic and Battery Energy Storage Systems (BESS) applications. The range is tested according to the UL, IEC and CCC standards to withstand the extreme outdoor conditions and sudden temperature changes that are usual in a solar farm.
ABB provides the most comprehensive portfolio of products, systems and solutions along the solar PV value chain that enable the generation, transmission and distribution of solar power for both on-grid and off-grid applications. New OTDC will be the next product to provide even further improvement in ABB's solar offering.
Deliveries in the United States are expected to start late November 2018.