H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/50
H02H 7/085 (2006.01) H02H 6/00 (2006.01)
Patent
CA 1193317
THERMAL MODEL FOR ELECTRICAL APPARATUS ABSTRACT OF THE DISCLOSURE A thermal model of an electric apparatus, such as a transformer or motor, from which signals can be obtained representing temperatures of the conductors and of the adjacent core material. A first and a second register hold values representing conductor temperature and core material temperature. A sensor and a digital-to-analog converter provide a digital signal representing current in the conductors and this is added to the first register to represent heat generated in the conductors. Values are determined for both heat transferred from the conductors and heat transferred into the core based on the difference in values in the first and second registers. The first value is subtracted from the first register and the second value is added to the second register. Another value is determined for heat transferred from the core material, based on the difference between the value in the second register and a reference value, and this is subtracted from the second register. This last value may be modified when the electric apparatus is a motor to provide for a condition of heat loss when the motor is rotating and when it is stationary. The first and second registers thus have available at all times stored values representing conductor temperature and core or average temperature and these temperatures can be used to interrupt the supply of power to the apparatus when predetermined levels are exceeded.
402483
Boothman David R.
Forde John C.
Canadian General Electric Company Limited
Eckersley Raymond A.
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