Self-powered current monitor

Details Self-powered current monitor Self-powered current monitor

1998-02-19

2000-01-25

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

702 64, 702 65, 361 18, 361 79, H02H 700

Patent

active

06018700&

ABSTRACT:
A self-powered current monitor for monitoring current in electric power systems. Various data relating to input currents may be displayed, such as current magnitude, current demand, and harmonics levels. Operating power is derived from one or more of the input currents. The power supply configuration may include a burden-reducing means to reduce the burden on input current sources during sampling of the input currents. The self-powered current monitor (1) includes a power supply section (3), input resistors (R1 and R3), an analog-to-digital converter circuit (5), a microprocessor circuit (6), a memory circuit (9), and a display circuit (7). Optional features include a burden-reducing circuit (2), input circuit protective elements (D1, D2, D3, D4, R2, and R4), an amplifier circuit (4), a user interface circuit (10), and an interface circuit (8) for communication to other equipment.

REFERENCES:
patent: 4550360 (1985-10-01), Dougherty
patent: 4884021 (1989-11-01), Hammond et al.
patent: 5315527 (1994-05-01), Beckwith
patent: 5426360 (1995-06-01), Maraio et al.
patent: 5579197 (1996-11-01), Mengelt et al.
patent: 5590179 (1996-12-01), Shincovich et al.

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