Industrial or domestic overvoltage protective device

Details Industrial or domestic overvoltage protective device Industrial or domestic overvoltage protective device

1984-07-10

1986-08-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361131, 361 71, H02H 904

Patent

active

046059814

ABSTRACT:
The device includes two detectors of overvoltage (8, 9) each connected between a respective one of a pair of power line conductors (1, 2) and a respective input of an arrester (7). The outputs of the detectors are connected to an OR-gate (10) the output signal of which is applied to a threshold gate (12). The output of gate (12) is connected to a first monostable trigger (13) having a first time constant and controlling, through a latch gate (14), a bipolar insulating device (3, 4) isolating the load (90) from the power network. In order to achieve the automatic reconnection of the load after each perturbance, the output of the latch gate (14) is also connected to a second monostable trigger (16) having a second time constant higher than the first, and to the clock input of a counter (15) having its return-to-zero terminal connected at the output of the second monostable trigger. Preferably, an integrator (11) is connected between the OR-gate (10) and the threshold gate ( 12).

REFERENCES:
patent: 3405318 (1968-10-01), Gilker

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