Motor protection apparatus

Details Motor protection apparatus Motor protection apparatus

H - Electricity

02

H

318/50

H02H 7/08 (2006.01) H02H 6/00 (2006.01)

Patent

CA 2032534

Protection apparatus for an AC or DC motor (4) and a static drive (8), including a static inverter or a static drive (8). An I2T signal is modified to take account of the frequency with which the switching elements of the drive (8) are switching their load current (at 42) and other factors. The modified I2T signal is lowpass filtered in a filter whose cutoff frequency is also a function of the drive's switching frequency. The resulting drive protection signal is compared with a predetermined threshold. An I2T signal is also modified to take account of the speed of the motor and other factors, then filtered, to provide a motor-related signal (at 90). Upon occurrence of an overload both the drive-related signal and the motor-related signal are independently capable of turning off the system by tripping a line contactor (6).

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