In order to improve the transfer capability of the 220-500 kV AC transmission system that forms the power network backbone in the Russian Far East interconnected power system, two new generation system protection schemes complexes were put into operation at the Zeya and Bureya hydro power plants. Putting into operation was accompanied by the series of full-scale tests. The peculiarities of the full-scale experiments were participation of the experts from Russia, Switzerland, Italy and the USA, and implementation of diverse phasor measurement units devices and digital fault recorders produced in different countries such as the USA, Sweden, Belgium and Russia.