Digital system for motor bus transfer

Details Digital system for motor bus transfer Digital system for motor bus transfer

2006-11-14

2008-12-23

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

C318S632000, C702S057000

Reexamination Certificate

active

07468593

ABSTRACT:
In industrial complexes and power stations a main source of power is connected to a motor bus to which motors and other loads are connected. In such systems an auxiliary source of power is provided to alternatively provide electric energy to the motor bus should the main source of power be interrupted. In the prior art digital system, samples are taken of the motor bus and auxiliary system voltage waveform with a fixed time window to predict the proper time for closing the breaker. The present invention improves on the prior art by applying the concept of an adaptive time window wherein the number of samples taken during each cycle to obtain the operating parameters is increased as the frequency decreases. This provides more accurate parameters for calculating the point for closing.

REFERENCES:
patent: 4310771 (1982-01-01), Wyatt et al.
patent: 4356972 (1982-11-01), Vikre
patent: 5224011 (1993-06-01), Yalla et al.
patent: 6397155 (2002-05-01), Przydatek et al.
patent: 6845333 (2005-01-01), Anderson et al.

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