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Commentary by Pigini

PPC Insulators

Revising IEC 60815

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With... Read More

‘Externalities’ of Overhead Power Lines

Public opposition and growing environmental awareness now make identifying corridors for new overhead lines an increasingly complex process – especially near densely populated or sensitive areas. Given this, it has become important to examine methodologies... Read More

Composite Insulators for DC

The world’s first DC lines were equipped with basically the same ceramic insulators used for AC. However, experience showed that, after only several years of service, there were problems with unacceptably high rates of puncture of porcelain and shattering... Read More

Corona Shielding for HVDC Line Insulators

Power utilities and insulator manufacturers continue to express differing views as to the relative value of shielding electrodes in DC. Back in 1972, significant laboratory research had already been undertaken on the influence of shielding and grading... Read More

Application of Composite Insulators to HVDC Systems

Application of Composite Insulators to HVDC Systems

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

Insulator End of Life: Recycling vs. Disposal

Insulator End of Life: Recycling or Disposal

The focus when it comes to electrical products and components has traditionally been on quality and performance in service. Increasing public awareness of environmental issues, however, has now led both manufacturers and users to pay greater attention to the... Read More

Artificial Pollution Tests for Polymeric Insulators

A few years ago, CIGRE WG C4.303 published Brochure 555, “Artificial pollution test for polymer insulators: results of a round robin test”, reporting on comparative pollution tests conducted at seven laboratories on two silicone line insulator samples.... Read More