Digital impedance relay

Details Digital impedance relay Digital impedance relay

1985-01-30

1987-01-13

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

364483, H02H 326

Patent

active

046369090

ABSTRACT:
A network impedance protection device operates in dependence on the quotient of voltage and current at a measuring point and is set to initiate a protective action when the measured impedance is lower than an impedance level set in the device. Known designs comprise analog components and functions both as regards quotient formation, comparison and compensation etc. An impedance relay constructed according to the invention utilizes the same principles as the analog design, but all units and functions are digitized. Incoming voltage and current signals are converted in an A/D converter, filtered in tuned filters, rectified in rectifiers, and so on, and deliver an output signal, via summators, when the measured impedance is lower than a set impedance value.

REFERENCES:
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patent: 3890544 (1975-06-01), Chanic
patent: 4125895 (1978-11-01), Buhlmann
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patent: 4371908 (1983-02-01), Andow et al.
patent: 4464698 (1984-08-01), Yoshizaki
patent: 4507700 (1985-03-01), Andow et al.

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