Conclusions
Monitoring of leakage currents on various types of insulators,
in the field and in laboratory tests, has provided a much broader
perspective on the performance of outdoor insulators in various
pollution zones. The technique can be effective for corrective
maintenance of transmission lines, provided the type of pollutant and the critical leakage currents are analyzed periodically. A
leakage current that is continuous, periodic, or increasing with
time is one consideration in the performance of insulators in pollution zones, whereas the maximum permissible levels of leakage current at flashover, which is considerably different for eachinsulator profile, is another consideration. What this means is
that insulators showing lower leakage currents will not necessarily have the best operating performance. The insulator profile
affects the accumulation of pollutants, which defines their pollution performance, and control of the leakage current by the
insulator design depends largely on the type of pollutant. As a
result, there is no unique solution, and leakage current values
with flashover risk from laboratory tests for various types of insulators must be determined by using the type of pollutant in the
field. This combination of strategies will provide an effective
means of ensuring reliable transmission line operation in pollution zones.
ConclusionsMonitoring of leakage currents on various types of insulators,in the field and in laboratory tests, has provided a much broaderperspective on the performance of outdoor insulators in variouspollution zones. The technique can be effective for correctivemaintenance of transmission lines, provided the type of pollutant and the critical leakage currents are analyzed periodically. Aleakage current that is continuous, periodic, or increasing withtime is one consideration in the performance of insulators in pollution zones, whereas the maximum permissible levels of leakage current at flashover, which is considerably different for eachinsulator profile, is another consideration. What this means isthat insulators showing lower leakage currents will not necessarily have the best operating performance. The insulator profileaffects the accumulation of pollutants, which defines their pollution performance, and control of the leakage current by theinsulator design depends largely on the type of pollutant. As aresult, there is no unique solution, and leakage current valueswith flashover risk from laboratory tests for various types of insulators must be determined by using the type of pollutant in thefield. This combination of strategies will provide an effectivemeans of ensuring reliable transmission line operation in pollution zones.
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