By R. DelVecchio, et al.
ISBN-10: 9056997033
ISBN-13: 9789056997038
Read Online or Download Transformer Design Prins - W. Appln to Core-Form Pwr Transformers PDF
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Extra info for Transformer Design Prins - W. Appln to Core-Form Pwr Transformers
Sample text
9 Bp. 32) In this expression, it is the flux change that matters since this is directly related to the voltage change as indicated in the first equality. In the second equality, we are measuring this flux change mathematically as if it all occurred in the core even though we know this is not true physically. 33× 106 A-t. For N=500, I=4660 Amps. This is quite high for an exciting current.
These are known as paramagnetic or diamagnetic materials, depending on whether an applied field increases or decreases the magnetization. Their permeabilities relative to vacuum are nearly equal to 1. In other materials, the atomic moments are large and there is an innate tendency for them to align due to quantum mechanical forces. These are the ferromagnetic materials. The alignment forces are very short range, operating only over atomic distances. Nevertheless, they create regions of aligned magnetic moments, called domains, within a magnetic material.
The core losses will also increase mainly due to flux distortion near the joint region. For linear materials, the slope of the B-H curve will decrease for a jointed core relative to an unjointed core. For materials which follow a hysteresis loop, the joints will have the effect of skewing or tilting the effective hysteresis loop of the jointed core away from the vertical compared with the unjointed ideal core. 23) where H1 is the field in the core steel and H2 the field in the gap. ᐉ1 and ᐉ2 are core and gap lengths, ᐉ the total length, and Heff an effective applied field.
Transformer Design Prins - W. Appln to Core-Form Pwr Transformers by R. DelVecchio, et al.
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