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TLA on top phase of Beauly-Denny 400 kV tower.

Experience with Application of TLAs on 400 kV Line

May 27, 2017 • Arresters, ARTICLE ARCHIVE Comments (0)

Lightning has been reported as the main cause of unscheduled outages on overhead sub-transmission and transmission lines (e.g. U.S.: 57%; Brazil: 50-70%; Japan: 70-80%; Denmark: 57%; Colombia: 47-69%). Reducing outages due to lightning has a major impact on overall reliability of both distribution and transmission lines. The main aim of installing transmission line arresters (TLAs) ...

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Technical Review of Hybrid Insulators

May 6, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

In the past, the main options for support insulators at air-insulated HVAC substations were either solid core porcelain or composite insulators up to 245 kV. In addition, RTV coatings have at times been applied to solid core porcelain post insulators to...

POWER ARC TESTING ON INSULATOR SETS

Dutch Grid Operator Developed New Transmission Line Design

May 13, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

Not long ago, Swissgrid announced an international tender to develop a new family of power structures as an alternative to the conventional lattice tower. In this regard, Switzerland is following the same course as other European countries, notably the United...

Predicting Performance of MV Epoxy Insulated Outdoor Equipment

Performance of MV Epoxy Insulated Outdoor Equipment

May 13, 2017 • ARTICLE ARCHIVE, HV/HP Testing Comments (0)

Because of its rigidity, the epoxy family of polymeric materials occupies a unique position in the field of outdoor insulation. For example, this property means that it cannot be classified as elastomeric, as are both silicone and EPDM rubbers. Also, epoxies...

Wireless Leakage Current Monitors to Improve Network Performance

May 20, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

As part of a program to provide an infrastructure for transmission line and substation monitoring, EPRI in the U.S. has worked on developing remote sensors to monitor the condition of important assets. This recent INMR article, contributed by Andrew J....

Selective Application of EGLAs on Transmission Lines

Selective Application of EGLAs on Transmission Lines in Malaysia

May 20, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

Malaysia’s power system operates in a region of intense lightning activity that adversely impacts performance of certain lines operated by the country’s grid operator, Tenaga Nasional Berhad (TNB). Among the lines most seriously affected by lightning are...

Principal Failure Modes for Surge Arresters

Principal Failure Modes for Surge Arresters

May 27, 2017 • Arresters, ARTICLE ARCHIVE, Article of the week Comments (0)

The failure of an arrester almost always results in a complete short circuit inside its housing. In most scenarios, failure occurs due to dielectric breakdown, whereby the internal structure has deteriorated to the point where the arrester is unable to...

Corrosion of Disc Insulators on DC Lines in China

May 20, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

Disc type porcelain and glass suspension insulators have been widely used in suspension applications on UHV DC projects in China due to their mechanical and electrical properties and also the depth of local operating experience. However, several years ago...

RIS Bushing Technology: Reliability Testing & Field Experience

May 13, 2017 • ARTICLE ARCHIVE, Bushings Comments (0)

Problems with bushings are one of the leading causes of transformer failure and that means their proper selection can significantly impact transformer and substation safety. Traditional bushing technologies such as oil-impregnated paper bushings (OIP) and...

Development & Testing of Explosion- Resistant Cable Terminations

Explosion-Resistant Cable Terminations

May 20, 2017 • ARTICLE ARCHIVE, Cable Accessories Comments (0)

Self-supporting, fluid-filled terminations have been used since the advent of HV cables and continue to be the first choice among most network operators due to their excellent long-term performance. Recently, composite housings have begun to replace porcelain...

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