Trip control apparatus of circuit breaker

Details Trip control apparatus of circuit breaker Trip control apparatus of circuit breaker

1988-08-08

1990-02-13

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 91, 361 92, 361187, H02H 324

Patent

active

049011847

ABSTRACT:
When a voltage (V) of a D.C. power source having an internal resistance (5a) exceeds an "exciting voltage" (FIG. 2), transistors (21, 28 and 33) turn ON, and a transistor (30) turns OFF, and then a tripping winding 16 is excited to close a circuit breaker; on the other hand when the voltage (V) is lowered under a "tripping voltage", the transistor (33) turns OFF and the transistor (30) turns ON, and thereby a load resistor (31) which is less than a resistance 34 of the tripping winding 16 is connected to the D.C. power source; consequently, the voltage V is further lowered by the internal resistance (5a), and a voltage difference is produced between the exciting voltage and the tripping voltage, thus making a "hysteresis characteristic" between the exciting voltage and the tripping voltage.

REFERENCES:
patent: 3749944 (1973-07-01), Luebrecht
patent: 4061518 (1977-04-01), Lang et al.
patent: 4126889 (1978-11-01), Ibamoto et al.
patent: 4163271 (1979-07-01), Sturrock
patent: 4270156 (1981-05-01), Fry

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