System and methods for ground fault threshold calibration using self-test circuit

A method for calibrating ground fault threshold using auto-monitoring circuit on a circuit board, the method comprising:

• providing, using a self-injection circuit, a trigger pulse input to the self-injection circuit;
• measuring a rectified voltage, wherein the rectified voltage is based on an AC voltage powering the circuit board;
• determining an expected current through the current transformer, based on the rectified voltage and series resistor in a current path;
• converting the expected current to a digital value using an analog to digital converter;
• and
• determining a tolerance level of the current transformer based on the digital value.

A non-transitory computer-readable medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed by one or more processors, facilitate:

• providing, using a self-injection circuit, a trigger pulse input to the self-injection circuit;
• detecting an output voltage from the current transformer;
• determining an expected current through the current transformer, based on the rectified voltage;
• converting the expected current to a digital value using an analog to digital converter;
• and
• determining a tolerance level of the current transformer based on the digital value.