Abstract
This chapter deals with coordination of insulation levels for overhead lines. As overhead lines operate at different voltage levels and connected with other parts of power system network, knowledge of power frequency nominal voltage levels has been presented. Then lightning of other transient over voltages has been presented. Concept of basic insulation levels has been provided mentioning its necessity. Then insulation coordination factors have been mentioned. Coordination with respect to insulation level of apparatus has been presented. Coordination with arresters has been described. Insulation coordination between overhead lines and connected substations has been discussed. At the end of the chapter, some useful standards have been listed for further study.
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