Current transformer polarity verification

A apparatus comprising:

• a processing device;
• and
• one or more storage devices storing instructions that are operable by the processing device and that upon such operation cause the processing device to determine a polarity verification of current transformer for a protected device, wherein:
• each of one or more phases of the protected device includes an input power leg, and each input power leg is coupled to an electronic sensor device by a respective current transformer;
• each respective current transformer is associated with a first primary node H1, a second primary node H2, a first secondary node S1, and a second secondary node S2, wherein the first secondary node S1 and the second secondary node S2 are connected to respective first and second nodes of the electronic sensor device, and the second primary node H2 of the respective current transformer is adjacent an input of an input power leg of the protected device;
• wherein the determining the polarity verification comprises the operations of:
• for each input power leg of the protected device:
• monitoring the injection of a first test current into a first primary node H1 of the respective current transformer that induces a second test current in a first secondary node S1 of the respective current transformer;
• monitoring the second test current;
• determining a positive test result when the second test current i) flows into a first node of the electronic sensor device and flows out of a second node of the electronic sensor device and ii) flows into the second secondary node S2 of the respective current transformer;
• and
• determining a negative test result otherwise;
• 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 power legs of the protected device.

One or more computer storage media storing instructions that when executed by one or more computers cause the one or more devices to the processing device to determining a polarity verification of current transformer for a protected device, wherein:

• each of one or more phases of the protected device includes an input power leg, and each input power leg is coupled to an electronic sensor device by a respective current transformer;
• each respective current transformer is associated with a first primary node H1, a second primary node H2, a first secondary node S1, and a second secondary node S2, wherein the first secondary node S1 and the second secondary node S2 are connected to respective first and second nodes of the electronic sensor device, and the second primary node H2 of the respective current transformer is adjacent an input of an input power leg of the protected device;
• wherein the determining the polarity verification comprises the operations of:
• for each input power leg of the protected device:
• monitoring the injection of a first test current into a first primary node H1 of the respective current transformer that induces a second test current in a first secondary node S1 of the respective current transformer;
• monitoring the second test current;
• determining a positive test result when the second test current i) flows into a first node of the electronic sensor device and flows out of a second node of the electronic sensor device and ii) flows into the second secondary node S2 of the respective current transformer;
• and
• determining a negative test result otherwise;
• 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 power legs of the protected device.