Loop impedance meter

Details Loop impedance meter Loop impedance meter

2007-09-04

2007-09-04

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S527000, C324S710000

Reexamination Certificate

active

11607213

ABSTRACT:
A loop impedance meter is provided for testing an AC electrical main supply incorporating a residual current device. The loop impedance meter includes an electrical control circuit for connecting a load resistance intermittently between the AC main supply terminal and the earth terminal to insure a potential difference between those terminals and to provide an indication of the loop impedance of the AC main supply from that potential difference. The control circuit includes an electronic switch in series with the load resistance, and arranged to open and close the electronic switch by applying a plurality of voltage pulses. The width of the voltage pulses is less than a millisecond, causing a series of measurement pulses of different widths to flow through the load resistance. The control circuit is arranged to process the results of measuring the loop impedance by extrapolating to the effective impedance at the AC mains supply frequency.

REFERENCES:
patent: 4810950 (1989-03-01), Young
patent: 6271668 (2001-08-01), Sehdev et al.
patent: 6288553 (2001-09-01), Hofstetter et al.
patent: 0881500 (1998-12-01), None
patent: 833339 (1960-04-01), None
patent: 2292225 (1996-02-01), None
patent: 2343005 (2000-04-01), None
patent: WO9501573 (1995-01-01), None

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