Alstom, Electronic Edition. — 10 pages.
На английском языке.The MiCOM P225 relay performs a full range of motor protection functions based on the measurement of current, voltage and temperature.
In addition to these basic functions, the relay carries out a large number of other functions that enable it to protect and run the motor more effectively. The reliability of the system is further enhanced via checks on bus voltage prior to start-up, supervision of trip-circuit wiring continuity and protection against circuit-breaker failure.Table of Contents:Introduction.
Protection and control.
Thermal overload (49) true RMS base.
Short-circuit (50/51).
Excessive start time (48/51).
Locked rotor while running or at start-up (50S/51LR).
Unbalance, loss of phase and single phasing (46).
Earth fault (50N/5IN).
Loss of load (37).
Temperature monitoring (38/49).
Re-acceleration authorisation (27 LV).
Undervoltage (27).
Overvoltage (59).
Limitation of the number of starts, time between starts (66).
Anti-backspin.
Presence of bus voltage prior to start-up.
Emergency start-up.
Latching of output relays (86).
CB failure (50BF).
Trip circuit supervision.
External trips.
Logical gates.
Two setting groups.
Measurements and monitoring.
Measurements.
Analogue outputs.
Trip cause statistics.
CB monitoring.
Event records.
Fault records.
Oscillography.
Shape of start-up current and voltage.
Back-up battery.
User interface.
Front plate and menus.
Fixed LEDs.
Programmable LEDs.
Push-buttons.
Communication.
MiCOM S1 setting and configuration software.
Mechanical aspects.
Housing.
Connectors.
Typical connection diagram.
Typical application diagram.
Technical specifications.
Inputs.
Auxiliary voltage supply Vaux.
Burdens.
Thermal withstand.
Accuracy.
CT data.
Optional analogue outputs.
Optional 10 RTD inputs.
Optional 3 thermistor inputs.
Thermal image settings.
Short-circuit protection.
Excessive start time protection.
Locked rotor protection.
Unbalance protection.
Earth fault protection.
Undercurrent protection.
Limitation of the number of start-ups.
Time between two start-ups.
Anti-backspin protection.
Re-acceleration autorisation.
Undervoltage protection.
Overvoltage protection.
Presence of bus voltage prior to start-up.
CB failure.
Trip circuit monitoring.
AND logical gates.
Latching of output relays.
CB control and monitoring.
Output relays.
Oscillography.
Modbus communication.
High voltage withstand.
Electrical environment tests.
Environmental withstand.
General description.
Case size.
