Significance Part 6: Textbooks, tutorials and reviews Part 7: Mitigation techniques Trade press announcement of the introduction to the U.S. market of Metal-Oxide Varistors intended for incorporation in original equipment manufacturers (OEM) equipment, with discussion of the principle of operation, background information on the origin of transients, and application information. It is noteworthy...

Power system overvoltages due to switching, lightning and other disturbances are the main problem for designers of the power transformers. Once some frequencies of the incoming surges match with some of the natural frequencies of transformer winding, the resonance phenomenon is expected in transformer winding. The resonant overvoltages may destroy the insulation between turns and cause to insul...

Significance Part 6: Textbooks, tutorials and reviews Part 7: Mitigation techniques Trade press announcement of the introduction to the U.S. market of Metal-Oxide Varistors intended for incorporation in original equipment manufacturers (OEM) equipment, with discussion of the principle of operation, background information on the origin of transients, and application information. It is noteworthy...

TERNA, the Italian TSO, is planning new HVDC interconnections with neighboring countries including underground links based on VSC technology; short circuit transient studies of such links require accurate cable line modeling in a frequency range from dc to 10 kHz at least. The finite section approach was used to this purpose. Short-circuit transient simulation results evidenced significant temp...

For development of a UHV transmission system, sophisticated system design is indispensable to deal with increased charging MVA and higher transmission voltage. Furthermore, for realization of technical and economical optimization throughout the design of the transmission line and the substation, solutions for network problems specific to UHV AC transmission system and problems with insulation c...

This paper presents an electromagnetic transient analysis of lightning-initiated overvoltage stresses the step-up transformers installed inside a nacelle onshore, multi-megawatt, new-generation wind turbines. The increase in turbine (WT) nominal power output, necessitated introducing transformer into nacelle. A is subjected to completely different from those present if it were at base WT tower....

This paper provides a brief perspective on how the coordination of cascaded surge-protective devices (SPDs) has become an issue. We propose an approach where the 'ancient' technology of gapped arresters may well be the answer to the dilemma of the incompatibility of a service-entrance SPD having relatively high limiting voltage with the proliferation of built-in or plug-in SPDs having relativel...

Condition monitoring of distribution equipment is essential for the prediction of distribution system failures. So, KEPCO developed intelligent distribution equipments that can diagnose its degradation conditions through special sensors and monitor its performance by a distribution automation system. Intelligent circuit breakers, switchgears, reclosers, transformers and surge arresters have bee...

Power system overvoltages due to switching, lightning and other disturbances are the main problem for designers of the power transformers. Once some frequencies of the incoming surges match with some of the natural frequencies of transformer winding, the resonance phenomenon is expected in transformer winding. The resonant overvoltages may destroy the insulation between turns and cause to insul...