Voltage detection of utility service disturbances

Details Voltage detection of utility service disturbances Voltage detection of utility service disturbances

1997-04-29

1999-08-24

Wachsman, Hal Dodge

Boots, shoes, and leggings

36452827, 702 60, 702 64, 307 43, 307 64, 307 86, 307 87, 361 86, 361 78, 361 90, H02H 324

Patent

active

059432462

ABSTRACT:
A digital voltage detector uses a running average to detect utility service disturbances in real time. An isolation transformer taps the main electrical AC power supply line and provides an analog voltage waveform to a system controller. The analog waveform is sampled digitally in real time, and the samples are squared to create respective instantaneous squared voltage values. A running average is kept of the instantaneous squared voltage values for a preselected period of time, preferably one half-cycle for the main power supply waveform. The running average is compared to a preselected under-voltage threshold value and a preselected over-voltage threshold value, and a disturbance detection signal is generated if the running average violates either threshold value. The disturbance detection signal is preferably used to activate a standby electrical AC power supply, and contemporaneously to disable the main electric AC power supply.

REFERENCES:
patent: 5229651 (1993-07-01), Baxter, Jr. et al.
patent: 5319514 (1994-06-01), Walsh
patent: 5390106 (1995-02-01), Cederblad et al.

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