Revenue meter with power quality features

Details Revenue meter with power quality features Revenue meter with power quality features

2008-03-11

2008-03-11

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Continuously variable indicating

With meter reading

C379S088190, C379S088200, C379S088210, C340S870030, C340S315000, C340S538170, C324S074000, C324S076110, C324S156000, C324S157000

Reexamination Certificate

active

11208926

ABSTRACT:
Power quality detection, monitoring, reporting, recording and communication in a revenue accuracy electrical power meter is disclosed. Transient events are detected by monitoring the wave shape of the electrical power and comparing deviations to a known threshold. Sags and Swells are detected by computing root mean square value over a rolling window and comparing the computed value with a known threshold. Harmonic frequencies and symmetrical components are quantified by a known algorithm and compared with a known threshold. Incoming waveforms are stored to memory. All recorded and computed data is moved to non-volatile storage via direct memory access transfer in the event that a power quality event jeopardizes the operating power of the meter. Further, the meter provides a power supply utilizing high and low capacitive storage banks to supply sufficient energy to survive short duration power quality events which jeopardize the meter's operating power.

REFERENCES:
patent: 4839819 (1989-06-01), Begin et al.
patent: 4843311 (1989-06-01), Rozman et al.
patent: 5017860 (1991-05-01), Germer et al.
patent: 5207595 (1993-05-01), Learmont et al.
patent: 6316932 (2001-11-01), Horan et al.
patent: 6615147 (2003-09-01), Jonker et al.

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