Resistive isolation detection methods and systems

Abstract

Implementations described herein relate to methods, apparatuses, and systems of leakage current detection. According to one implementation, a method includes initiating self-test of a resistive isolation detection circuit, the self-test configured to return a reset latched value representative of a state of the resistive isolation circuit, pulsing a latch reset signal to clear the reset latched value and a testing signal to indicate a testing state, and during the testing signal, independently determining, that a leakage current is present between a photovoltaic power conversion device positive channel and earth, and, that a leakage current is present between a photovoltaic power conversion device negative channel and earth. The method also includes operating a safety relay and indication signal responsive to the testing signal and the independent determining.