Motor Protection Relays Micom P225

Technical Data and Curve Characteristics P22x/ EN TD/ D55 MiCOM P220/ P225 Page 1/ 38 CONTENTS 1. PROTECTION FUNCTIONS 3 1.1 Too long start-up protection ( Start-Up criteria) 3 1.2 Thermal replica [ ANSI 49] 3 1.3 Short-circuit protection [ ANSI 50/ 51] 3 1.4 Earth fault protection [ ANSI 50/ 51N] 4 1.5 Unbalance protection [ ANSI 46] 4 1.6 Undervoltage protection ( P225 only) [ ANSI 27] 4 1.7 Overvoltage protection ( P225 only) [ ANSI 59] 4 1.8 Locked rotor protection [ ANSI 51LR/ 50S] 4 1.9 Under current ( Loss of load) protection [ ANSI 37] 4 1.10 Optional 6 ( P220) or 10 ( P225) RTD inputs 5 1.11 Optional 2 ( P220) or 3 ( P225) thermistor inputs 5 2. AUTOMATION FUNCTIONS 6 2.1 Limitation of the number of start-ups [ ANSI 66] 6 2.2 Time between 2 start-ups 6 2.3 Anti-backspin protection 6 2.4 Re-acceleration authorization ( P225 only) 6 2.5 Presence of bus voltage prior to start-up ( P225 only) 6 2.6 CB failure 6 2.7 Trip circuit supervision 6 2.8 Auxiliary timers 6 2.9 Logic equation 6 2.10 Latching of output relays 6 2.11 CB control and monitoring 7 3. RECORDING FUNCTIONS 8 3.1 Event recorder 8 3.2 Fault recorder 8 3.3 Oscillography 8 3.4 Start-up current and voltage envelope record 8 4. COMMUNICATION 9 4.1 MODBUS TM communication 9 4.2 K-bus/ Courier communication 9 4.3 IEC 60870-5-103 communication 10 4.4 Front communication 10