Thermal modeling of overcurrent trip during power loss

Details Thermal modeling of overcurrent trip during power loss Thermal modeling of overcurrent trip during power loss

1994-01-19

1995-05-23

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 31, 364483, H02H 504

Patent

active

054186773

ABSTRACT:
An electrical overcurrent circuit provides both digital based modeling and analog based modeling of the temperature of an electrical conductor to simulate the conductor temperature during all expected operating conditions including a condition when electrical power is unavailable to the electrical overcurrent circuitry. When electrical power is available to the circuitry, the conductor temperature is calculated from the sensed load currents to form the digital based model. During such a condition, the analog based model is forced to track the digital based model. Once the temperature of the electrical conductor exceeds its maximum safe operating temperature, the electrical overcurrent circuitry initiates a trip of the circuit breaker. Since the overcurrent circuitry is powered either by the sensed load currents or derived from the circuit breaker output, the circuit breaker trip will result in a loss of electrical power to the electrical overcurrent circuitry. This causes the digital based model to be reset to a cold conductor temperature value. However, the analog based model continues to operate to simulate the conductor temperature during this condition. When electrical power is restored to the circuit, for example, when the circuit breaker is closed, the digital model is initialized with the value from the analog model.

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