Q:

The direct-loss measurement technique is used to measure losses of a single-phase transformer as illustrated in Fig. E2.3.1 [7].

Figure E2.3.1: Application of direct-loss measurement technique to a single-phase transformer; (a) equivalent circuit, (b) measuring circuit.

Q:

Solution

Transformer losses are

Rearrangement of terms results in

Note that P _loss consists of the sum (not the difference) of two components where ( v ₁ ? ) and ( i ₁ ? ) can be accurately measured and calibrated. Thus the difference of P _in and P _out is not computed as for the indirect, conventional method of Section 2.2.4.1. This method can be applied to polyphase systems as discussed in [8, 9, in Chapter 2]. The two available sampling methods series and parallel sampling are addressed in Appendix 1.

Q:

The objective of this example is to show that the K-and F _HL-factors are a function of the number and order of harmonics considered in their calculation. The harmonic content of a square wave with magnitude 1.00 pu is known.

1. Develop a Fourier analysis program for any periodic function resulting in the DC offset and the amplitudes of any even and odd...