What is psm in power system?
Likewise, if we put the plug at 8. During study of electrical protective relays, some special terms are frequently used. Plug setting multiplier (PSM) Indicates the severity of the fault. RELAY PSM stands for Plug Setting Multiplier RELAY PSM is calculated as follows = fault current ÷ current setting. PSM and TMS Settings are used to specify the tripping limits of a relay. Power Systems-Plug Setting Multiplier (PSM)-PSC Questions.