Pollution flashovers of insulator strings have historically been one of the main causes of line outages under normal operating conditions. Indeed, years ago this was a relatively common occurrence across many countries suffering from heavy industrial... Read More
About 20 million composite line insulators are already in service on HVAC overhead lines all over the world. Moreover, the growth in market penetration of this technology seems exponential. The first installations were in Germany in 1967, predominantly in... Read More
As is long known, the design of insulation for DC transmission is much more demanding than for AC, particularly from the standpoint of pollution performance. Fig. 1 below, for example, derives from laboratory testing of ceramic insulators and plots unified... Read More
Composite insulators are today quite widely used and well-accepted throughout the world. In China, for example, there several million such insulators already in service on HV transmission lines up to 1000 kV AC and ± 800 kV DC. In addition, huge numbers of... Read More
If someone had to rank transmission service environments across the globe in terms of the severity of their pollution challenges, Algeria would surely find itself near the top of the list. Covering a vast expanse of some 2.3 million sq km, it is the largest... Read More
The superior pollution performance of silicone rubber insulators is due mainly to their hydrophobicity transfer property. This not only prevents the formation of a continuous film of water but also slows down the entire salt dissolving process such that only... Read More
Failures of insulators due to pollution flashover can prove very costly, causing potentially long outages and requiring expensive and time-consuming maintenance. By most accounts, one of the leading causes of such failures is improper specification of... Read More
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