THE USE OF SURGE ARRESTERS ON SECTIONS OF 110 KV OVERHEAD LINES WITHOUT A GROUND WIRE

The use of surge arresters on overhead lines instead of ground wire is a common practice. Operational experience shows that the number of damaged protective devices increases on such lines. It’s important to choose the right energy discharge capability to prevent the failure of surge arresters due to a lightning strike. Therefore, the study of the energy characteristics of surge arresters remains relevant. The article considers a special case of the intersection of two overhead lines. In that situation ground wire is removed from the lower line in the intersection span. Surge arresters are installed on the upper phases in that span. The amount of surge arrester discharge energy was determined as a function of the parameters of the lightning current pulse and the parameters of the overhead line. The following values were varied: the front and amplitude of the lightning current pulse, the tower footing resistance, the number of insulators in the string