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

Claim 0:
1. 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 which cause the control circuit to adjust a default setting for operation of the transformer protection circuit between a first mode and a second mode;
wherein, in the first mode, a switch assembly of the transformer protection circuit operates in a normally-closed state and the programmable circuit automatically opens the switch assembly to remove a bypass path from between the transformer neutral and the ground based on detection of a triggering event, the bypass path bypassing the direct current blocking component, the triggering event being at least one of:
a direct current or quasi-direct current between the transformer neutral and the ground;
a direct current or quasi-direct current in at least one phase of the transformer;
a direct current voltage at the transformer neutral;
a harmonic signal in at least one phase of the transformer; or
an electromagnetic event detected in a vicinity of the transformer; and

wherein, in the second mode, the switch assembly operates in a normally-open state and the programmable circuit automatically closes the switch assembly to form the bypass path between the transformer neutral and the ground based on detection of a second triggering event, the second triggering event being at least one of:
an alternating current at the transformer neutral above a predetermined AC threshold;
an alternating current between the transformer neutral and the ground exceeding a second predetermined AC threshold over a predetermined amount of time;
a voltage at the transformer neutral above a predetermined threshold;
a time-overvoltage at the transformer neutral exceeding a second predetermined threshold; or
actuation of an overvoltage protection device positioned in parallel with the direct current blocking component between the transformer neutral and the ground.