Apparatus for detecting a ground connection on load side of neut

Details Apparatus for detecting a ground connection on load side of neut Apparatus for detecting a ground connection on load side of neut

1975-03-21

1976-02-17

Miller, J. D.

317 27R, 317 53, H02H 316, H02H 328

Patent

active

RE0287164

ABSTRACT:
An improper or undesired second ground connection on the load side of the neutral conductor of an electrical supply system is detected by coupling an oscillator to the neutral conductor and to least one other conductor of the supply system in a balanced mode. In the absence of said improper or undesired second ground, oscillator signals cancel on the two conductors. When said second ground is present, oscillator current flows therethrough and the impedance change in the grounded neutral conductor is reflected back to the oscillator tank circuit to change the output signal of the oscillator. Change in output signal is detected and actuates circuit breaker to disconnect the supply system.

REFERENCES:
patent: 3213321 (1965-10-01), Dalziel
patent: 3345539 (1967-10-01), Ashenden et al.
patent: 3381533 (1968-05-01), Behrens
patent: 3475698 (1969-10-01), Noe
patent: 3611035 (1971-10-01), Douglas
patent: 3638072 (1972-01-01), Kobayashi
patent: 3668469 (1972-06-01), Lee
patent: 3713003 (1973-01-01), Benham
patent: R25762 (1965-04-01), Kotheimer

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