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While uprating an overhead line to a higher voltage level, it is often difficult to achieve the required clearance level for the uprated structure. Use of Transmission Line Arresters (TLAs) is an effective technique in controlling overvoltages and thereby, achieving the required clearance margin. In this paper, suitability of this technique in reducing the clearance margin is discussed. A case study...
While observing the impulse voltage distribution within a transformer winding, it can be seen that parts of the windings are excited by unidirectional and bidirectional oscillating voltages. The inter-turn and inter-disc winding failures are attributed to these oscillating voltages. Attempts are made to study the behavior of air, transformer oil, and oil-impregnated paper (OIP) insulation under these...
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