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Applicability of SSTDR Analysis of Complex Loads

Spread spectrum time domain reflectometry (SSTDR) can be used to measure complex impedances in live electrical systems by evaluating the shape and magnitude of the reflected signature. A range of capacitors or inductors can be identified, but above and below this range, they cannot be distinguished from open or short circuits. This range depends on the frequency band of the reflectometry system and characteristic impedance of the transmission line. This can be used to characterize changes in complex impedance for the purpose of fault detection in complex loads, such as PV panels and systems.