Boots – shoes – and leggings
Patent
1979-05-07
1981-01-13
Krass, Errol A.
Boots, shoes, and leggings
340734, 361 63, 364802, 364857, G06G 762
Patent
active
042453186
ABSTRACT:
Demonstrator apparatus utilizes a display to portray in log-log coordinate scale the trip-time curve of a solid state (static) trip circuit breaker. A simulated static trip unit programmer is selectively adjustable to vary the shape and position of the displayed trip-time curve. An overlay bearing the trip time-current curve for a prospective upstream or downstream circuit protective device is superimposed on the display and the programmer adjusted to demonstrate selective trip coordination. Alternatively, a pair of simulated trip unit programmers are connected to the display to jointly portray thereon a pair of trip-time curves. Also disclosed is the utilization of a computer to generate on a display plural time-current response curves of a series of circuit protective devices selected on the basis of specific distribution system parameters to provide requisite system protection and response coordination.
REFERENCES:
patent: 3444434 (1969-05-01), Zocholl
patent: 3537096 (1970-10-01), Hatfield
patent: 3944890 (1976-03-01), Little
patent: 4017766 (1977-04-01), Vercellotti et al.
patent: 4036553 (1977-07-01), Borel et al.
Eckart Gregory C.
Jacobs Lewis W.
Kornblit Morris J.
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Krass Errol A.
Schlamp Philip L.
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