Harmonic measuring instrument for AC power systems with a time-b

Details Harmonic measuring instrument for AC power systems with a time-b Harmonic measuring instrument for AC power systems with a time-b

1992-08-21

1994-04-05

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 340658, 364483, 324107, G08B 2100

Patent

active

053009240

ABSTRACT:
An instrument for measuring voltage harmonics and current harmonics on AC (alternating current) power systems. The instrument includes the ability to determine when threshold limits have been exceeded for harmonics. The instrument also includes timing thresholds whose inputs are activated when the harmonic thresholds are exceeded. A single harmonic threshold is applied to measurements from multiple phases on poly-phase systems by comparing the square rot of the sum of the squares of measurements from each phase to the harmonic threshold. Three indicators show when voltage harmonic limits are exceeded, current harmonics limits are exceeded, or both voltage and current harmonic limits are exceeded simultaneously.

REFERENCES:
patent: 4884021 (1989-11-01), Hammond et al.
patent: 4924412 (1990-05-01), Leydier
patent: 4931725 (1990-06-01), Hutt et al.
patent: 4933869 (1990-06-01), Gareis et al.
patent: 4964055 (1990-10-01), Grassel et al.
patent: 5059896 (1991-10-01), Germer et al.
"IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems", Project IEEE-519/D7, Draft for Balloting dated Dec., 1990.

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