A METHOD FOR DETERMINING THE OPERATING STATUS OF A SPRING CHARGING MOTOR FOR A LV OR MV SWITCHING APPARATUS AND A DIAGNOSTIC SYSTEM IMPLEMENTING SAID METHOD

• Main Authors: Magoni, Stefano, Scarpellini, Massimo, Oprandi, Alessandro
• Format: Patent
• Language: English; French; German
• Published: 25.07.2018
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

A method (100) for determining the operating status of a spring charging motor (10) of a LV or MV switching apparatus (50). The method comprises the following steps: - acquiring a detection signal (I D ) indicative of the behaviour of a driving current (I MOT ), which feeds said spring charging motor during an operation cycle of said spring charging motor; - processing said detection signal (I D ) to calculate a steady-state detection signal (I DSS ) indicative of the behaviour of said driving current (I MOT ) during a steady-state time interval (T SS ) comprised in the operation cycle of said spring charging motor; - processing said steady-state detection signal (I DSS ) to calculate data (DS) indicative of HF and LF spectral components of said driving current (I MOT ) during said steady-state time interval; - processing said data (DS) indicative of said HF and LF spectral components to calculate first and second harmonic distortion values (THD LF , THD HF ), which are indicative of the total harmonic distortion of said LF and HF spectral components, respectively; - processing said first and second harmonic distortion values to calculate first and second output data (O 1 , O 2 ), which are indicative of the variations of said first and second harmonic distortion values with respect to corresponding first and second reference values, respectively. The invention relates also to a diagnostic system (1) implementing said method.