Editorial Columns

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Assessing EHV & UHV Station Post Insulators

Developments in station post insulator technologies can help minimize arcing distances needed at busbars, disconnectors and similar apparatus and therefore contribute to more flexible substation design. In general, station posts can be optimized by using... Read More

Fault Current Withstand Capability

There are two types of fault currents that can appear on power systems: ground and phase-to-phase. More important with regard to arresters is the former, which is basically the current that flows through the circuit when there is a short to ground. The... Read More

Best Practice When Installing TLSAs

I recently participated at a conference that dealt with best practice for extra high voltage overhead lines. It was good to work with old friends and also meet other experts as we organized the program. We applauded the recent election of keynote speaker, Rob... Read More

Insulator Failures from Improper Selection

At a past CIGRE meeting in Paris and in particular during the Study Committee B2 session on Overhead Lines, there was much discussion on the still debated issue of the ‘stateof- the-art’ of composite insulator technology. A spectrum of contradictory case... Read More

Dielectric Strength & Air Density

While a number of atmospheric parameters affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, the focus is on the former, which plays a key role in developing... Read More

Progress Standardizing Recommended Creepage in DC

Today’s demand for integrating renewables into energy supply has made HVDC transmission a much more interesting option than in the past. This is triggered by factors such as that HVDC systems may be less expensive in terms of required equipment investment... Read More

Resistivity Measurement of Conductive Silicones

Modern cable accessories and connectors are being manufactured using a broad range of silicone elastomers and auxiliary materials – from fluids to gels to pastes. Those elastomers that contain electrically conductive fillers (generally referred to as... Read More

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