ABSTRACT
The capacitances for use in circuit or traveling-wave models must be determined to simulate the behavior of a transformer under impulse conditions. The highest electrical stresses usually occur at the high-voltage end of the winding so that modifications of the first few disks are sometimes required to meet the voltage breakdown limits. This modification can take the form of the addition of one or more static rings so that their effect on the disk capacitance must be determined. Other methods such as the use of wound-in shields and interleaving are effective in increasing the disk capacitance, which is desirable for a better voltage distribution. An energy method to determine the capacitance or, in general, the capacitance matrix. This method is a generalization of the method used by Stein to determine the disk capacitance of a disk embedded in a winding of similar disks. This chapter establishes the calculations of winding–winding, winding–core, and winding–tank capacitances that are all qualitatively similar.
