Motor monitoring and protection using residual voltage
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorMarcos A. Donolo
Life of this patent
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Abstract
Residual voltage measurements taken after removal of electric power to an electric motor are used to improve the functioning of an electric motor monitoring system. For example, an intelligent electronic device (IED) may acquire residual voltage measurements of a motor after disconnected electric power to the motor. The IED may determine a thermal condition of the motor based at least in part on the residual voltage measurement. The IED may prevent starting of the motor based at least in part on the thermal condition.
Claims20
An intelligent electronic device (IED), comprising:
- a processor operatively coupled to a memory, wherein the processor is configured to execute instructions stored on the memory to cause the processor to:
- acquire residual voltage measurements of a motor after disconnecting electric power to the motor;
- determine a thermal condition of the motor based at least in part on the residual voltage measurements;
- prevent starting of the motor based at least in part on the thermal condition.
A system, comprising:
- sensor circuitry configured to be operatively coupled between a switching device and a motor, wherein the sensor circuitry is configured to provide a signal indicating residual voltage measurements of the motor;
- a processor operatively coupled to a memory, wherein the processor is configured to execute instructions stored on the memory to cause the processor to:
- acquire the residual voltage measurements;
- and
- prevent starting of the motor based at least in part on the residual voltage measurements.
A method, comprising:
- acquiring, via an intelligent electronic device, residual voltage measurements due to a residual voltage of a motor after disconnecting electric power to the motor;
- displaying an operating condition of the motor based at least in part on the residual voltage measurements on a display screen of the intelligent electronic device.
Dependencies are inferred from the claim text.