Inductive voltage transformer and circuit therefor

Details Inductive voltage transformer and circuit therefor Inductive voltage transformer and circuit therefor

1981-05-29

1982-12-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361156, H02H 704

Patent

active

043630626

ABSTRACT:
Disclosed are an inductive voltage transformer having a primary winding connected to a network line and a protective circuit therefor. In order to prevent a large thermal and mechanical stress in such a transformer, the protective circuit comprises a control unit which controls a switching device for connecting a circuit arrangement to a secondary winding of the voltage transformer. The circuit arrangement includes a current generating circuit with a charging capacitor. The protective circuit operates to generate a current causing a counter excitation in the transformer to that caused when the capacitance of the network line is discharged via the primary winding of the transformer. The voltage transformer and the protective circuit are suited particularly for connection to network lines having a large internal capacitance.

REFERENCES:
patent: 2610231 (1952-09-01), Wettstein
patent: 2789253 (1957-04-01), Vang
patent: 4016485 (1977-04-01), Samorodov et al.
patent: 4307428 (1981-12-01), Yanabu et al.
"The Cause and Control of Some Types of Switching Surges"-Schroeder Transactions AIEE, pp. 696-700, 11/1943.

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