Construcción de un dispositivo de protección para motores trifásicos de inducción basado en el microcontrolador PIC

Abstract

The next article explains the designing process, the development (hardware and software) of the implemented prototype, analysis over the results from testing; to provide immediate protection to three-phase induction engines in case of failure of one of one phase, the unbalanced voltage percentage greater than 3% or the inversion in the phase sequence, utilizing as main element a PIC microcontroller to process the different type of signals (analog and digital signals). The project addresses the conditioning of voltage signals and phase sequence identification. Mainly, it analyzes the development of the routines in charge of verifying the three phase connection, identifying the phase sequence, reading of voltage values, and calculating the unbalanced voltage percentage to detect the errors due to the variation in the voltage levels later on, which can cause an irreversible damage to the engine if present. As a result, images and tables are shown to verify the correct functionality of the prototype, which acts as a three phase voltmeter and verifies the issues it can produce on the three phase network.