Tamper detection system for load management device

Details Tamper detection system for load management device Tamper detection system for load management device

1992-10-30

1994-09-06

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

307 38, 340540, 340644, 340653, 340664, G08B 2100

Patent

active

053452259

ABSTRACT:
A tamper detection system for promptly warns a utility that it has lost control of a load which is part of a load management system, and may be giving price incentives to a customer without receiving the corresponding benefit arising from the intended control of the load. A monitor circuit automatically determines whether the load management device is connected to the load by detecting whether a current is passing via the load control device to the load, and generates a warning signal when no current is detected for a first predetermined period of time. The load current is detected either by inductively coupling a conductor to the load with a sensing conductor, or by sensing current induced in the load control relay as the load current passes through the relay contacts. The tamper detection feature operates without any activity of the load management device, and detects disconnection of the load even when the load management device itself is powered up and working properly.

REFERENCES:
patent: 4086434 (1978-04-01), Bocchi
patent: 4190800 (1980-02-01), Kelly, Jr. et al.
patent: 4675896 (1987-06-01), Young
patent: 5015944 (1991-05-01), Bubash
A promotional brochure entitled "Digital Control Unit Series DCU-S2000A," which is distributed by Scientific Atlanta. The date of the brochure is not known, but the device shown in the brochure was on sale more than one year before the filing date of the present application.

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