Neutral point plate of three-phase transformer for large seconda

Details Neutral point plate of three-phase transformer for large seconda Neutral point plate of three-phase transformer for large seconda

1984-02-23

1985-03-26

Kozma, Thomas J.

Inductor devices

Polyphase

Interconnected windings

336 84C, 373102, H01F 3300, H01F 1504

Patent

active

045076367

ABSTRACT:
The present invention relates to a structure of neutral point of multiphase transformers for large secondary currents. Such multiple phase transformers, usually three phase transformers, are used for example for the operations of arc furnaces, and the secondary current of the transformer may amount to several thousand ampere. The neutral point is made as a plate (24) of material with good electric conductivity and is located within the transformer tank (27). Between the neutral point plate (24) and the tank wall (27) there is located a plate (25) of a material with good conductivity and serving as a screen for reducing losses in the tank wall (screen plate). The transformer is star connected on the secondary side. Each phase of the secondary winding consists of several windings connected in parallel, and the tappings are passed as parallel conductors onto the neutral point plate (24). The neutral point tappings (22) are connected to the neutral point plates (24), whereas the phase tappings are passed through openings both in the neutral point plate (24) and the screen plate (25) onto insulating ducts (26) in the tank wall (27).

REFERENCES:
patent: 3436703 (1969-04-01), Schlawin
patent: 3465272 (1969-09-01), Bach
patent: 4174509 (1979-11-01), Bach et al.
patent: 4375627 (1983-03-01), Hansen et al.

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