Power grid protection device composed primarily of a switched grounding connection being one or more circuit breakers in series, circuit blocking component being a capacitor positioned parallel to the switch grounding connection, and DC current and power harmonic electronic sensing control circuit for detection of a DC current and quasi-DC current intended to provide a solid AC electrical ground and to block induced DC electric currents

Shielded computer racks, Data center modules for use in the storage of computer hardware, Monitoring and detection systems comprised of a loop antenna, electronic circuits, electronic and computer processors, and a communications bus, and Shielded table top units intended to hold portable electronic and computer equipment, all of the aforementioned intended to guard against electromagnetic interference

Shielded computer racks, Data center modules for use in the storage of computer hardware, Monitoring and detection systems comprised of a loop antenna, electronic circuits, electronic and computer processors, and a communications bus, and Shielded table top units intended to hold portable electronic and computer equipment, all of the aforementioned intended to guard against electromagnetic interference

Shielded computer racks, Data center modules for use in the storage of computer hardware, Monitoring and detection systems comprised of a loop antenna, electronic circuits, electronic and computer processors, and a communications bus, and Shielded table top units intended to hold portable electronic and computer equipment, all of the aforementioned intended to guard against electromagnetic interference