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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 se

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Language

EN

Category

nonfiction

Subjects

Technology, Energy, Stem