High resistance ground fault detector and locator for polyphase

Details High resistance ground fault detector and locator for polyphase High resistance ground fault detector and locator for polyphase

1977-09-30

1979-04-24

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3108

Patent

active

041514602

ABSTRACT:
A ground fault detection system is taught which may be utilized on delta or wye connected polyphase electrical systems. The presence of a ground fault causes the neutral to ground voltage of a wye connected electrical system to increase to some value other than zero. Since a delta power system can be interconnected with a wye monitoring system to create an artifical neutral, a ground fault detector and pulsing arrangement can be provided between ground and the appropriate monitoring neutral. This system includes a coil which actuates a relay system which causes a first resistor to be alternately connected into and disconnected out of the ground current return path. The connection is made in parallel with a fixed resistor. This causes a change in the value of ground fault current with a given periodicity and frequency which in turn induces electromagnetic radiation around that path through which the ground fault current flows. This in turn allows for electromagnetic determination of the place where the ground fault occurs. In another embodiment of the invention, a broken delta secondary winding for a wye connected primary winding for a sensing transformer for a delta power system may be utilized in certain applications to modulate or pulse ground fault current.

REFERENCES:
patent: 689254 (1901-12-01), Varley
patent: 2466079 (1949-04-01), Brunt
patent: 2641633 (1953-06-01), Hosford
patent: 3031613 (1962-04-01), Hojding
patent: 3343080 (1967-09-01), Fox
patent: 3621384 (1971-11-01), Yamada
patent: 4021730 (1977-05-01), Brinegar

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