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Google patents method to auto-check current transformer wiring

The filing describes a system that automatically checks if electrical sensors are wired correctly. It sends a small test current through the sensor to see if the resulting signal matches a specific pattern. If the wiring is reversed, the system adjusts its settings to compensate for the error.

Why it mattersThis improves the reliability of electrical monitoring systems by automatically detecting and correcting common wiring mistakes, reducing the need for manual inspection.

In the filing’s own words

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying current transformer polarity for one or more current transformers. In one aspect, a method comprises for each input power leg of a protected device, injecting a first test current into a first primary node H 1 of a respective current transformer to induce a second test current in a first secondary node S 1 of the respective current transformer, determining a positive test result based on the flow of the second current, and determining a polarity verification for each of the input power legs of the protected device when a positive test result is determined for each of the one or more input legs of the protected device.

What exactly they claim (claim 1)

1. A method of verifying and configuring current transformer polarity for a protected device that includes at least one input power leg coupled to an electronic sensor device by a respective current transformer, the respective current transformer having a first primary node, a second primary node, a first secondary node, and a second secondary node, the method comprising: injecting a first test current into the first primary node of the respective current transformer to induce a second test current in the first secondary node of the respective current transformer; monitoring a flow direction of the second test current at a first node and a second node of the electronic sensor device; determining a polarity verification result for the respective current transformer by comparing the monitored flow direction of the second test current to a pre-programmed signature designation associated with the electronic sensor device; and in response to determining a negative verification result based on the comparison, changing a pre-defined configuration of the electronic sensor device to correct a polarity orientation of the respective current transformer.

Facts

Company
Google (Google LLC)
Official title
CURRENT TRANSFORMER POLARITY VERIFICATION
Publication number
US20260290685A1
Application number
19693252
Filed
May 29, 2026
Published
Sep 24, 2026
Inventors
3
Claims
14

Classified under

H01F 38/32 Electricity & electronicsG01R 31/62 Physics & computingH01F 38/30 Electricity & electronicsG01R 35/02 Physics & computingH02M 3/33571 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.