Meter tampering detector

Details Meter tampering detector Meter tampering detector

1989-12-07

1993-07-13

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

324110, G01R 1124

Patent

active

052276686

ABSTRACT:
An apparatus for detecting illegal tampering with an electricity meter which is adapted to record the amount of electricity supplied to the meter through cables has a first signal generating sensing coil situated externally of, and upstream of, the meter which generates a first signal representative of the current flowing through one of the supply cables and a second signal generating second sensing coil, located within the meter, which generates a second signal representative of the amount of electricity to be recorded by the meter. A Monitoring device monitors the first and second signals and produces a third actuation signal when one of the first and second signals differs from its correct value as a result of tampering. The first and second signals charge and discharge a capacitor. When the voltage on the capacitor reaches a predetermined level, the third signal, which may cause the load to be disconnected or may produced a warning, is generated.

REFERENCES:
patent: 4240030 (1980-12-01), Bateman et al.
patent: 4331915 (1982-05-01), Fielden
patent: 4420721 (1983-12-01), Dorey et al.
patent: 4583043 (1986-04-01), Phillips
patent: 4727315 (1988-02-01), Jones
patent: 4843310 (1989-06-01), Friedl

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