Open neutral protection

Details Open neutral protection Open neutral protection

1975-04-03

1976-10-19

Envall, Jr., R. N.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

317 18C, 317 27R, 317 31, 317 48, 324 51, 340253B, 340256, H02H 314

Patent

active

039873412

ABSTRACT:
An artificial neutral voltage derived from the voltages on both energized lines of a three-wire, single-phase energy supply system is compared to the voltage on the neutral line. Comparator means energize interrupter means to cause the cessation of a current flow in the energized lines of the circuit in the event the neutral line voltage is more than a predetermined value above or below the artificially derived neutral voltage for protection in the event an open neutral line condition occurs even when loads are not attached to the energized power lines.

REFERENCES:
patent: 2598775 (1952-06-01), Fischer
patent: 3426342 (1969-02-01), De Langis
patent: 3611053 (1971-10-01), Rowell
patent: 3659152 (1972-04-01), De Langis
patent: 3714517 (1973-01-01), Stacek
patent: 3766434 (1973-10-01), Sherman

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