What is tms psm in idmt relay?

TMS (Time Multiplier Setting) and PSM (Plug Setting Multiplier) are parameters used in IDMT (Inverse Definite Minimum Time) relays for protection systems. TMS determines the time delay for the relay’s operation based on the current magnitude, while PSM indicates the current setting relative to the relay's rated current, influencing the sensitivity and operation of the relay. Together, these settings help in coordinating protective devices and ensuring a timely response to fault conditions.