THE USE OF SUSPENDED METAL-OXIDE ARRESTERS FOR PHASE-TO-EARTH AND PHASE-TO-PHASE OVERVOLTAGES

Very light and mechanically strong metal oxide arresters in polymer ho usings can be suspended directly from line conductors, for example und er the supporting string insulator. In this case it is possible to lim it both phase-to-ground and phase-to-phase overvoltages. Analysis of t he currents through phase-to-ground and phase-to-phase arresters of va rious types of commutation has made it possible to establish the optim um relation between the number of phase-to-ground and phase-to-phase a rresters on the basis of the need for equal limitation of the phase-to -ground and phase-to-phase overvoltages.