On-load transformer tap changing system

Details On-load transformer tap changing system On-load transformer tap changing system

2008-04-08

2008-04-08

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

C323S340000

Reexamination Certificate

active

07355369

ABSTRACT:
An on-load transformer tap changing system, for example for a power transformer, wherein the secondary or primary of a transformer includes at least one first tap and one second tap. A main connection circuit is used for permanent connection of the first tap or the second tap to an output terminal of the secondary or primary of the transformer. Secondary connection circuits are each used to connect a tap temporarily and directly to the output terminal of the secondary or primary of the transformer. Each of the connection circuits includes one or more insulated gate bipolar transistors. The system can be controlled without zero current value transition detection in the secondary winding.

REFERENCES:
patent: 4562338 (1985-12-01), Okami
patent: 4860145 (1989-08-01), Klingbiel
patent: 4888545 (1989-12-01), Celenza et al.
patent: 5969511 (1999-10-01), Asselman et al.
patent: 6472851 (2002-10-01), Hammond
patent: 6559562 (2003-05-01), Rostron
patent: 0 644 562 (1995-03-01), None
patent: 8-288154 (1996-11-01), None
patent: WO 01/22447 (2001-03-01), None
Database WPI, AN 1997-026938, XP-002319314, JP 08-288154, Nov. 1, 1996.

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