Experience gained in automatic equipment operation of the brushless excitation circuit of the TVV-500-2 turbogenerators

A diode circuit for brushless excitation of turbogenerators at the Leningrad-, South-Ukrainian- and Rovno NPPs is described. The turbogenerator has both the main voltage regulator and subsidiary duplicate regulator, preventing the generator from losses of static and dynamic stability for any reason: either due to voltage increase in the system, as specified by the project, or due to any malfunction in the excitation automatics. The circuit permits to reserve the main regulation channel not according to discrete emergency signals, but according to the factor, determininig stable operation of the generator. The use of such a circuit permits to increase the excitation circuit reliability and to perform maintenance operations either on the main or on duplicate channel of regulation during the generator operation in the network