Motor protection apparatus

Details Motor protection apparatus Motor protection apparatus

H - Electricity

02

H

318/50

H02H 7/085 (2006.01) H02H 7/08 (2006.01)

Patent

CA 1193316

MOTOR PROTECTION APPARATUS ABSTRACT OF THE DISCLOSURE A method of and apparatus for protecting three phase electrical equipment where a signal is derived for each phase representing current in each phase, and the three signals combined to form an analog composite signal. The analog composite signal is converted to digital form, and the values stored. One of the analog signals is used to relate the values of the digital signals to respective phases. The largest value is used to determine heating in the equipment and from the heating the temperature of the equipment is derived. The temperature is compared to critical temperature levels and when a critical level is exceeded, the supply of power to the equipment is interrupted. The digital signals representing the current peaks in each phase are used to determine phase loss and phase unbalance, and the power supply is interrupted when there is a phase loss or when the unbalance exceeds a predetermined critical level.

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