System and method for analysis of the insulation condition of an electrical machine by the phases, and, storage media

A system for analyzing the insulation condition of an electrical machine, the electrical machine comprising a housing, a plurality of supply conductors, and at least one grounding branch, the system comprising:

• at least one scanning module coupled to the plurality of supply conductors, the scanning module comprising at least one injection coil and at least one current reading coil externally positioned around the plurality of supply conductors, wherein the at least one injection coil comprises an injection winding and a voltage reading winding, and the at least one current reading coil comprises a current reading winding;
• at least one control module coupled to the scanning module, the control module comprising at least one microprocessor, at least one storage medium, and a plurality of converters;
• and
• at least one analysis module coupled to the control module, the analysis module comprising at least one processor configured to execute spectral processing algorithms;
• wherein the scanning module is configured to inject and measure, via electromagnetic induction through the at least one injection coil, a plurality of voltage signals having frequencies in a range of 1 kHz to 10 MHz between the housing of the electrical machine and the plurality of supply conductors, and to measure, via electromagnetic induction through the at least one current reading coil, a plurality of currents circulating in the plurality of supply conductors in response to the injection of each of the plurality of voltage signals, the injection and measurement being performed without galvanic contact between the system and the plurality of supply conductors;
• wherein the control module is configured to control and synchronize the injections and measurements of the scanning module and send measurement data to the analysis module;
• and
• wherein the analysis module is configured to process the data received from the control module and determine the condition of the insulation by calculating at least one statistical indicator based on a comparison of a measured frequency response of the electrical machine with a stored baseline frequency response of the electrical machine.