Methods and systems for detecting dc influence in a current sensor
AssigneeGeneral Electric Company
InventorsRobert Edward Lee, JR., Donald Frank Bullock
Life of this patent
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Abstract
Methods and systems for an electrical meter are provided. The meter includes a current sensor configured to be communicatively coupled to a conductor, and a processor communicatively coupled to the current sensor wherein the processor is configured to receive signals indicative of current flow through the conductor and wherein the processor is further configured to process the signals to determine an imbalance between the positive half cycle of the current flowing through the conductor and the negative half cycle of the current flowing through the conductor to detect a DC influence on the current sensor.
Claims20
An electrical meter comprising:
- a current sensor configured to be communicatively coupled to a conductor;
- and
- a processor communicatively coupled to said current sensor, said processor configured to receive signals indicative of current flow through the conductor, said processor further configured to process the signals to determine an imbalance between the positive half cycle of the current flowing through the conductor and the negative half cycle of the current flowing through the conductor.
A method of detecting a DC influence of a current sensor, said method comprising:
- integrating a total RMS current from the sensor over a predetermined period of time;
- integrating at least one of an RMS current of a positive half cycle and an RMS current of a negative half cycle over the predetermined period of time;
- and
- determining an imbalance of the RMS current of the positive half cycle and the RMS current of the negative half cycle using at least two of the integrated total RMS current, the integrated RMS current of the positive half cycle, and the RMS current of the negative half cycle.
A metering system comprising:
- a current sensor configured to be communicatively coupled to a conductor;
- first and second accumulators configured to receive samples from said current sensor and to separately accumulate values indicative of at least two of a total current flowing through the conductor, a current flowing through the conductor during a positive half-cycle, and a current flowing through the conductor during a negative half-cycle for a predetermined sample period of time;
- and
- a processor programmed to determine an imbalance between the current flowing through the conductor during a positive half-cycle, and a current flowing through the conductor during a negative half-cycle using the accumulated values.
Dependencies are inferred from the claim text.