Monitoring system in real time of the state of capacitance graded bushings of power transformers, powers reactors, current transformers, circuit breakers and similar, it is applied preferentially by power transformers; power reactors; chain transformers, circuit breakers and similar, being the system passible of accomplish the monitoring in real time of capacitance graded bushings (1), each one resulted from a capacitive 'tap' to which connects a 'tap' adapter (3) that, then, connects to a measuring module (4) which receives signals coming from capacitive 'tap' (2) of three graded bushings (1) which form a triphase group. One or more measuring modules (4) can, if connect to an only interface man-machine module (5), by means of a serial communication (6), forming a modular system.