Microprocessor based motor protective relay with rotor temperatu

Details Microprocessor based motor protective relay with rotor temperatu Microprocessor based motor protective relay with rotor temperatu

1987-03-31

1988-05-10

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318334, 361 24, H02H 708, G05D 2300

Patent

active

047438185

ABSTRACT:
A motor protection relay is taught in which the temperature of a rotating rotor is inferred from the current flowing in the lines which supplies the motor and from resistance temperature detection devices in the stator of the motor. By utilizing a periodic predictable established interrupt routine within the software which controls the microprocessor which in turn controls the monitoring device the time based model for inferring rotor temperature can be freed of a requirement to use a fixed sampling time rather the time for calculations can be variable. The total number of counts that particular interrupt routine has taken place will be factored into the calculations to make the calculations accurate. The thermal model is further improved by expressing it in terms of current squared times time so that the component portions of the equation which represents the thermal model can use accumulator inputs into which values of line current squared have been previously placed.

REFERENCES:
patent: 4434390 (1984-02-01), Elms
patent: 4467260 (1984-08-01), Mallick, Jr. et al.
patent: 4510548 (1985-04-01), Boothman
patent: 4672288 (1987-06-01), Abbondanti
"IQ-2000.TM. Model B Motor Command System User's Manual", Apr., 1985, Relevant Material may be Found on any Page.

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