100 earth stator protection system and method based on the third self-adjusting harmonic measurement

摘要

100% stator earth protection system and method based on the self-adjusting third harmonic measurement. # 100% stator earth protection method and system for synchronous machines based on the third harmonic measurement that is adjusted according to the operating conditions of the machine, thus avoiding unwanted trips. # To do this, the third harmonic produced by each winding of the machine is measured. From this measurement the theoretical value that the third harmonic must have in the neutral or in the terminals of said machine is calculated. And finally this theoretical value is compared with the measurement in the neutral or in the terminals, determining that there is a defect if they are not equal.