Minimum size, integral, A.C. overload current sensing, remote po

Details Minimum size, integral, A.C. overload current sensing, remote po Minimum size, integral, A.C. overload current sensing, remote po

1979-10-09

1982-02-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With manual or automatic opening of breaker and manual reclose

361 72, 361102, 361 96, H02H 3093

Patent

active

043162304

ABSTRACT:
A reset lockout addition to an A.C. overload current sensing, remote power controller of minimum size and weight and integral construction. Current rate sensing wound toroids are used that are small enough to fit around the line terminal studs without having to enlarge prior insulator space available therein. The electronic overload current detecting and tripping control circuit, is replaced by a pair of modules, detector and control modules, having improved performance and a shape and size such that they fit within the relay housing alongside its operating magnet. The detector module has integrator means for converting current rate of change signals into magnitude indicative signals thereby enabling use therewith of rate sensing wound toroids of about one-tenth the size of equivalent current transformer wound toroids. It fully meets the calibrated step function overload trip time requirements while also providing protection for unusual overload conditions such as varying overloads including pulse accumulation effects or repetitive reset, and simulates the response of a thermal element to prevent excess heating of the wire or load that it is protecting under any overload conditions. Moreover, the control module incorporates a single standard CMOS IC logic element that provides a digital solution to the combinations of control conditions requirements while at the same time reducing the number of conventionally-required cutthroat contacts from two to one and isolating the control input from the relay power circuit. Associated with this logic element is a reset lockout circuit responsive to overload trip that prevents resetting of the relay by the set control switch alone but requires an additional manual operation, that is, momentary opening of a reset switch in conjunction with the opening of the set control switch to reset the relay.

REFERENCES:
patent: 2925536 (1960-02-01), Stineman
patent: 3706100 (1972-12-01), Halbeck et al.
patent: 3706916 (1972-12-01), Halbeck et al.
patent: 3846676 (1974-11-01), Ryczek et al.

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