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Insulators

Designing Composite Hollow Core Insulators for Pollution Performance under AC & DC

October 14, 2017 • ARTICLE ARCHIVE, InsulatorsComments Off on Designing Composite Hollow Core Insulators for Pollution Performance under AC & DC

Composite housings are fast becoming a standard solution implemented in power grids worldwide and especially preferred for application in severely polluted service environments. To ensure performance under such conditions, the following design tests are generally performed: • IEC 60587 [2] – Inclined plane test • IEC 61462 [3] (§7.3.2) / IEC 62217...

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Insulator Test Station Helps Support Preventative Maintenance Strategy

October 14, 2017 • ARTICLE ARCHIVE, Insulators, Maintenance

While insulators account for less than 10% of the total cost of new overhead lines and substations, the potential consequences of their improper selection and poor performance are estimated to account for up to 60% of the Life Cycle Cost of these...

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Dielectric Testing of 400 kV Polymeric Insulators

October 7, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators

Dielectric type tests of insulator sets have been performed for decades to ensure satisfactory electrical performance when these are installed on distribution and transmission lines. Recently, four fully accredited high voltage test laboratories performed a...

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Field Experience with RTV-Coated Glass Insulators

October 7, 2017 • ARTICLE ARCHIVE, glass, Insulators

Among the options to resolve contamination problems on overhead lines is specifying greater creepage distance on insulators or using silicone rubber materials – or both. The latter solution can be achieved through a silicone housing, as in the case of a...

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Key Issues for Future Development of Composite Insulators

October 7, 2017 • ARTICLE ARCHIVE, Insulators

Data on numbers and types of line insulators purchased by the State Grid Corporation of China (SGCC) from Jan. 2012 to Sep. 2017 in the voltage range 110 kV to 1000 kV AC and ±800 kV DC show interesting developments. In total, SGCC purchased 34.1 million...

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Progress in Insulator Technology & Need for Standards

October 7, 2017 • ARTICLE ARCHIVE, Insulators

Standards have great long-term impact on any industry and especially on the types of products found in the marketplace. For example, standards automatically determine quality and stability of products and therefore influence customer trust and acceptance. The...

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Shielding Electrodes for AC & DC Insulators

October 7, 2017 • ARTICLE ARCHIVE, Insulators

Shielding electrodes of different form are usually specified for AC lines with three main purposes: • To eliminate corona from insulator fittings (i.e. a corona shielding function); • To grade the voltage potential along the string in order to limit the...

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Polymeric Insulation for Today’s Network Requirements

October 2, 2017 • ARTICLE ARCHIVE, Insulators

Among the earliest basic concepts in polymeric insulators were monolithic designs made of structural materials such as epoxy, first developed during the 1950s. At the time, conventional porcelain and glass insulators were recognized as state-of-the-art and...

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