With this Protection Relay Setting Calculator, you'll be able to work out pickup current, time multiplier settings (TMS), operating time, coordination time interval (CTI), and plug setting multiplier (PSM) based on fault current, CT ratio, and the IEC 60255. With this Protection Relay Setting Calculator, you'll be able to work out pickup current, time multiplier settings (TMS), operating time, coordination time interval (CTI), and plug setting multiplier (PSM) based on fault current, CT ratio, and the IEC 60255. Pick Up Current Definition: The current level at which the relay begins to operate, overcoming the controlling force. Current Setting: The adjustment of the relay's pickup current by changing coil turns, expressed as a percentage of the CT's rated secondary current. Plug Setting Multiplier (PSM):. Protection relays employ a wide range of configurable parameters to identify defects & trip the breaker in a controlled & selected manner. Understanding each setting facilitates proper relay coordination. TSM – Time. An Overcurrent Relay Setting Calculator is a online calculator tool that determines the proper relay settings to safeguard electrical circuits against excessive current flow. All calculations are based on the available documentation/ information. These settings may be revaluated during the commissioning, according to actual and/or measured values.
