Circuit arrangement for superposing starting conditions at an el

Details Circuit arrangement for superposing starting conditions at an el Circuit arrangement for superposing starting conditions at an el

1975-11-11

1976-12-28

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

235184, 307235C, 324158R, 328127, H02H 720, H02H 708

Patent

active

040004104

ABSTRACT:
A circuit arrangement for superposing or impressing starting conditions at an electrical operating means primary simulator composed of RC-elements wherein the primary simulator network is charged by a charging current functionally dependent upon an operating current to a charging voltage representative of the heating-up or thermal behavior of the operating means and the charging voltage appears at a low-ohmic or low-impedance output of a charging state-storage device for controlling an electronic operating means-protection relay. According to the invention, an auxiliary simulator composed of an RC-element, and the time-constant of which is greater than one-half the smallest time-constant of the primary simulator and smaller than twice the largest time-constant of the primary simulator, is connected by means of a switching means or device responsive to the supply voltage with the charging state-storage device when the protection relay-power supply is intact for adjusting the charging voltage of the auxiliary simulator-capacitor to the charging voltage of the primary simulator and is disconnected from undesired discharges in the case of a defective or faulty protection relay-power supply. Upon recurrence of the protection relay-power supply the auxiliary simulator is temporarily connected through the agency of an impedance converter with the primary simulator for recharging the primary simulator-capacitor of its first RC-element to the charging voltage of the auxiliary simulator.

REFERENCES:
patent: 3573451 (1971-04-01), Fricke, Jr. et al.

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