Functions of SRT:

• automatically and semiautomatically rotating a turbine;
• synchronizing a turbogenerator (TG) with an electric network;
• loading or unloading TG with a rate specified by an operator;
• maintaining parameters of a turbogenerator at a specified level (rate of rotation – regulating accuracy not worse than ± 10 rpm, capacity – regulating accuracy not worse than ± 10 MW, steam pressure in a main steam collector – regulating accuracy not worse ± 0.5 kgf/cm²) in starting and operating modes;
• assuring unloading TG in load-relief modes when technological protections of a turbine, reactor facility or protections of a generator are active;
• remotely controlling control valves of a turbine by operator’s commands;
• performing the following protective actions:

• preventing unacceptable increase in turbine rotation speed during load-reliefs;
• changing a turbine over to idling or to auxiliaries while maintaining nominal speed after load-relief;
• forming protection signals when acceptable turbine speed is exceeded;
• limiting planned capacity changes.

Composition of SRT:

• an ShERS-1 cabinet of an electronic speed regulator, a ShSRT-1 cabinet of a turbine regulating system implemented based on MSKU industrial controllers;
• a diagnostics and archiving server, an engineering station of an automatic regulating system implemented based on PS5140 worksations;
• RMO operator’s workstations.

System advantages:

• reliable execution of safety electronic automate functions (maintaining a turbine at a power level available at the moment of failure of a main electrohydraulic regulating system);
• high operation speed (duration of a main operational cycle – 10 ms, time of response to discrete signals from emergency automation and signals of generator’s switch position – not more than 5 ms, generation time for a signal “Protection by TG’s rotor speed” from an initial event (change of frequency) – not more than 5 ms);
• possibility of supply within USNE TO, which reduces quantity of equipment due to use of workstations of USNE in SRT;
• possibility of operation in three modes:

• using an electronic part of electrohydraulic regulating system;
• using an electronic speed regulator;
• in a manual control mode.

Safety class – 3.
Safety category – В.

Implementation facilities:

Zaporizhzhya NPP, units 1, 2