Device for reducing harmonics in three-phase poly-wire power...

Details Device for reducing harmonics in three-phase poly-wire power... Device for reducing harmonics in three-phase poly-wire power...

2005-08-25

2009-12-08

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Including a transformer or an inductor

Polyphase or plural transformers

C323S247000, C307S105000, C361S035000

Reexamination Certificate

active

07629786

ABSTRACT:
The invention is a harmonics reduction device for three-phase poly-wire power lines, which can more reliably eradiate harmonics current applied to an electric power system via a neutral line. The invention comprises an electric power system having three-phase poly-wire power lines in order to supply alternating-current (AC) power voltage to a load; a zigzag transformer in which windings connected with three-phase lines in the electric power system are wound through first and second legs, second and third legs, and third and first legs of a core having three legs, respectively, while varying direction of each magnetic flux, and an intermediate point of each winding is commonly connected with a neutral line of the electric power system and that of the load; and an open delta connection portion in which an winding connected with the neutral line of a load side is wound through the three legs so as to be connected with a neutral line of the electric power system.

REFERENCES:
patent: 5345375 (1994-09-01), Mohan
patent: 5656924 (1997-08-01), Mohan et al.
patent: 5790356 (1998-08-01), Bottrell et al.
patent: 5982262 (1999-11-01), Levin
patent: 7489485 (2009-02-01), Alakula et al.
patent: 2001-0083809 (2001-09-01), None
patent: 20-0338373 (2004-01-01), None
patent: 10-0534144 (2005-11-01), None

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