Analysis of Electrical Characteristics of Composite Insulators with the Presence of Optimum Layer of ZnO Microvaristors

Table 9

Outage rate and outage cost for different modelling of insulator.

Footing impedance (ohm)	Clean insulator				Polluted insulator
	Without microvaristor CFO =1495.87 (kV)		With microvaristor CFO =1689.11 (kV)		Without microvaristor CFO =1225.49 (kV)		With microvaristor CFO =1413.70 (kV)
	LFOR	($)	LFOR	($)	LFOR	($)	LFOR	($)
20	0.14	8.4	0.06	3.6	0.35	21	0.18	10.8
100	0.53	31.8	0.37	22.2	0.72	43.2	0.59	35.4
200	0.78	46.8	0.65	39	0.89	53.4	0.81	48.6