Precise water absorption diagnosis a method and an apparatus in water-cooled generator stator windings

摘要

PURPOSE: A moisture absorption diagnosis method of a water cooling generator stator winding and a device thereof are provided to determine moisture absorption doubt or whether or not of moisture absorption, thereby increasing accuracy of a moisture absorption diagnosis. CONSTITUTION: Capacitance is measured by using a moisture absorption sensor for a folding unit of a generator stator core. The measured capacitance is inputted to a computer. Moisture absorption doubt or whether or not of moisture absorption is determined by using at least one of a normal distribution method, a normal probability method and a BPM. The measured capacitance is analyzed by comparing the same with the capacitance stored in a memory. The capacitance for each location is compared and analyzed with coils nearby a coil which moisture absorption is doubted. [Reference numerals] (AA) Start; (BB) Step of measuring capacitance of an insulating material by using a moisture absorption sensor at a position extended from a stator core to a terminal part; (CC) Step of determining adsorption using NDM, NPM, and BPM methods based on the measured capacitance; (DD) Step of analyzing trends by comparing the measured data with the absorption test data previously measured at the same position to determine the increase of capacitance; (EE) Step of analyzing and determining a large change of capacitance by comparing the capacitance of absorption-doubtful wiring with the capacitance of a peripheral wiring; (FF) End