Patent ID: 11923129
Assignee: TECHHOLD LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A control circuit communicatively connected to a transformer protection circuit including a direct current blocking component electrically connected between a transformer neutral and a ground and a switch assembly electrically connected in parallel to the direct current blocking component, the control circuit comprising:
a programmable circuit configured to execute instructions to:
detect a triggering event at the transformer neutral;
based on the triggering event occurring, determine whether to automatically actuate the switch assembly to close to form a bypass path between the transformer neutral and the ground;
based on a hazard condition being present when the triggering event is detected, override the determination of whether to actuate the switch assembly, thereby maintaining the switch assembly in an open position;

wherein the triggering event comprises at least one of:
a voltage at the transformer neutral above a predetermined threshold;
a time-overvoltage at the transformer neutral exceeding a second predetermined threshold;
actuation of an overvoltage protection device positioned in parallel with the direct current blocking component between the transformer neutral and the ground;
an alternating current between the transformer neutral and the ground above a predetermined AC threshold; or
an alternating current at the transformer neutral exceeding a second predetermined AC threshold over a predetermined amount of time;

wherein the hazard condition comprises at least one of:
a direct current (DC) voltage at the transformer neutral exceeding a predetermined DC voltage threshold;
an electromagnetic pulse event; or
a geomagnetically induced current having a rise time of less than 25 seconds.