An improved method of measuring C/sub 1/ power factor of resistance-graded bushings

Detection of power transformer bushing faults and oil degradation using frequency response analysis

“…There are two common types of transformer bushings namely, solid porcelain bushing which is used for small rating transformers and oil filled condenser bushing, also known as oil impregnated paper (OIP) bushing, that is used for large rating transformers [30]. An OIP transformer bushing is composed of winding insulation paper around a central core as shown in Figure 4.…”