High voltage transformer with a shield ring, a shield ring...

Details High voltage transformer with a shield ring, a shield ring... High voltage transformer with a shield ring, a shield ring...

2007-08-17

2010-10-05

Mai, Anh T (Department: 2832)

Inductor devices

With electric and/or magnetic shielding means

C336S212000, C336S090000

Reexamination Certificate

active

07808351

ABSTRACT:
A high voltage transformer including a transformer housing. Internal components and provided in the transformer housing. The internal components are submerged in transformer oil and are provided with insulation for insulating a high voltage winding end. The insulation includes a shield ring arranged above the winding end and a pressboard structure formed in a zigzag pattern arranged around the winding end. The shield ring includes a core covered with a conducting layer and a continuous solid insulation layer outside the conducting layer. The insulation layer includes integrated solid insulation sections of which at least some among themselves having varying thickness. Also a shield ring and a method of manufacture the shield ring.

REFERENCES:
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patent: 02148810 (1990-06-01), None
patent: 3-285310 (1991-12-01), None
patent: 03289110 (1991-12-01), None
PCT/ISA/210—International Search Report—Nov. 13, 2007.
PCT/IPEA/409—International Preliminary Report on Patentability—Mar. 3, 2008.
Xiang et al., Design of insulated structure for load-ratio voltage power transformer by finite element method, IEEE Transactions on Magnetics, vol. 30, No. 5, Sep. 1994.

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