This IEEE 300-bus test case was “developed by the IEEE Test Systems Task Force under the direction of Mike Adibi in 1993” [1].
This IEEE 300-bus system contains 69 generators, 60 LTCs, 304 transmission lines, and 195 loads.
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[1] http://www.ee.washington.edu/research/pstca/pf300/pg_tca300bus.htm