The external characteristics of the synchronous generator generally refer to the internal potential unchanged, when the load current changes, the generator terminal voltage change curve, mainly to test the vertical axis synchronous reactance of the generator, that is, the internal impedance of the generator, is an important indicator of the load capacity of the synchronous generator. But now synchronous generators mostly use thyristor fast excitation and damping winding, its longitudinal axis synchronous reactance is mostly transient value, far less than the steady state value. In addition, due to the regulating role of the excitation system, the external characteristics can be artificially manufactured, can be positive or negative, positive external characteristics is the machine end voltage with the load current growth and decrease, negative is the machine end voltage with the load current growth and increase, the general excitation system can be adjusted in the range of plus or minus 15%.
Insulation coordination: The voltage protection level of the electrical primary system, in the case of lightning strikes, operating overvoltage, the insulation level of the conventional transformer, generator, line is not enough to fight, the need for lightning arrester, capacitor and other components for protection, the action value of the arrester, the action delay and the main equipment of the component insulation and voltage withstand capacity, especially the impact voltage withstand capacity of the coordination, called insulation coordination. The requirement is that the arrester must act before the main equipment insulation damage, and when there are multiple components with different insulation levels, different insulation protection elements must be equipped for different components, and the coordination of these protection elements is also a big problem.
For more questions about the generator set, please call the Beidou Power team. More than ten years of professional production and sales of power generation equipment experience, more professional engineer team to serve you, choose Beidou power is to choose rest assured, welcome on-site factory inspection.
Post time: Feb-28-2025