Electronic trip device comprising an improved long delay functio

Details Electronic trip device comprising an improved long delay functio Electronic trip device comprising an improved long delay functio

1991-06-21

1993-03-16

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, H02H 308

Patent

active

051950120

ABSTRACT:
To perform the long delay function of an electronic trip device, a quantity (TLR1) representative of the thermal current state varies proportionally to the difference (I.sup.2 -Is.sup.2) between the square of a value (I) representative of the current flowing in a conductor to be protected and the square of a current threshold (Is). This first quantity (TLR1) is used in combination with a second value (TLR2) to produce a tripping signal when the second value exceeds a preset value (TLR2max). The second quantity preferably increases proportionally to the square (I.sup.2) of the value representative of the current, when the first quantity exceeds a preset threshold (STLR1) and decreases, preferably exponentially, when the first quantity is lower than this threshold.

REFERENCES:
patent: 4445183 (1984-04-01), McCollum et al.
patent: 4717985 (1988-01-01), Demeyer

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