This model is a distribution grid with 750 nodes. It can run in SSN at a time step in the 60-65µs range in real-time on Xeon V3 (with 6 cores allocated on the same CPU socket).
References
C. Dufour, G. Sapienza, "Testing 750 node distribution grids and devices using optimized parallel delay-free real-time solvers and modern grid protocols" 2015 International Symposium on Smart Electric Distribution Systems and Technologies (EDST), Vienna, Austria, Sept. 8-11, 2015