By Rolf Fischer
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Sample text
If the harmonics cannot flow in any of these paths then the output voltage will contain the harmonic distortion. Even if the neutral of the supply and the star-connected winding are both earthed, as described above, then although the transformer output waveform will be undistorted, the circulating third-order harmonic currents flowing in the neutral can cause interference with telecommunications circuits and other electronic equipment as well as unacceptable heating in any liquid neutral earthing resistors, so this provides an added reason for the use of a deltaconnected tertiary winding.
It is also possible that a tapped winding may have an axial gap when some of the tappings are not in circuit. It is usual therefore to apply various correction factors to l to take account of these practical aspects. However, these corrections do not change the basic form of the equation. 2) given in the previous chapter determine the basic parameters which fix the design of the transformer. f. is related to the MVA or kVA rating of the transformer and the maximum total flux, 8m , is the product of the maximum flux density and core cross-sectional area.
More will be said about this type of transformer in Chapter 7. It is necessary to mention dielectrics thus far in order to distinguish between the principal types of transformers, oil filled and air insulated; this chapter will examine in detail the basic materials which are used to build transformers and mineral oil will be examined in some depth later. It is appropriate to start at the fundamental heart of the transformer, the steel core. 2 CORE STEEL The purpose of a transformer core is to provide a low-reluctance path for the magnetic flux linking primary and secondary windings.