ANALYSIS OF OVERVOLTAGE POSSIBILITY ON THE EXCITATION WINDING OF A SYNCHRONOUS GENERATOR OF AUTONOMOUS POWER SUPPLY SYSTEM IN CASE OF EXTERNAL SYMMETRICAL SHORT CIRCUIT
Reliable supply of consumers with electric energy largely depends on the reliability of power source functioning. In the context of this paper it depends on synchronous generators operating in autonomous power supply systems. In contrast to the power plant generators which are part of power systems and are protected from the loads by sufficiently large resistances, power supply systems with autonomous generators are characterized by rather low resistances. Abrupt changes in the supply load parameters, their own transient and emergency modes, for example, short circuits at the generator terminals, forcing excitation, etc. may lead to various failures in the synchronous generator operation. This paper discusses the possibility of overvoltage in the valve excitation system of a synchronous generator with external three-phase short circuits. On the basis of analytical expressions describing the physical processes occurring in the excitation system of synchronous generators, the conditions for the occurrence of overvoltages are identified.