Adjustable time delay relay

Details Adjustable time delay relay Adjustable time delay relay

1978-03-13

1980-05-20

Griffin, Donald A.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307126, 361196, H01H 4306

Patent

active

042041287

ABSTRACT:
An adjustable time delay relay is provided which is particularly suitable for automatic transfer switches and other applications requiring a relatively long time delay during periods when electrical power is not available. The relay includes a relay coil connected across a large storage capacitor supplied from an AC power source through a diode.
The timing function is provided by a separate timing capacitor which, upon discharge through an associated adjustable resistor, operates a switching transistor to establish a low impedance path across the relay coil, thus discharging the storage capacitor and de-energizing the relay. Such a construction eliminates the need for a close tolerance, high value storage capacitor and provides a high degree of time delay reproducibility despite variations in power supply voltage.

REFERENCES:
patent: 3564346 (1971-02-01), Atkins
patent: 3899717 (1975-08-01), Legatti

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