Power theft detection circuit

Details Power theft detection circuit Power theft detection circuit

1982-05-03

1985-07-30

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Meter protection or fraud combatting

324127, G01R 1124, G01R 120

Patent

active

045324719

ABSTRACT:
The power theft detector circuit (10, 110 and 210) detects when current is being diverted around a line conductor (20 or 220) passing through a meter housing (14 or 214). The circuit (10, 110 or 210) includes a current transformer (12, 112 or 212) coupled to the line conductor (20 or 220) within the meter and defines a primary winding (20 or 220) of the current transformer (12, 112 or 212). A secondary circuit (23, 123 or 224) includes a secondary winding (22, 122 or 226) of the transformer (12, 112 or 212) and sensing circuitry (24, R.sub.m, R.sub.1, and S; 124, R.sub.m, R.sub.1, S and 126; 232, R.sub.m, and 240) for sensing a change in the impedance reflected from the primary circuit into the secondary circuit (23, 123 or 224) when a low impedance jumper (26, 260) is connected in parallel with the line conductor (20 or 220) in the meter thereby to sense a power theft condition.

REFERENCES:
patent: 4301403 (1981-11-01), Hawkes et al.
patent: 4331915 (1982-05-01), Fielden
patent: 4337466 (1982-06-01), Spahn

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