MENU MENU

Articles

Testing 320 kV HVDC XLPE Cable Systems

May 11, 2019 • ARTICLE ARCHIVE, TestingComments Off on Testing 320 kV HVDC XLPE Cable Systems

There are two unique test requirements in testing a high-voltage direct-current (HVDC) cable system compared to high-voltage alternate-current (HVAC) cable system: a specified maximum temperature drop across the insulating layer of a cable (Δθmax) and a superimposed impulse withstand test. Here, the focus is on this topic, based on practical testing...

Read More
PPC Insulators

Implementing a Program to Monitor Condition of Station Arresters

May 11, 2019 • Arresters, ARTICLE ARCHIVE, Utility Practice & ExperienceComments (0)

To protect expensive assets at its substations, Elektroprenos BiH – the company operating the power system in Bosnia and Herzegovina – began installing metal oxide (MO) surge arresters in each of its HV transformer bays about 20 years ago. Over the years...

Bushing Technology Review

May 11, 2019 • ARTICLE ARCHIVE, BushingsComments (0)

Bushings are devices that allow conductors to pass through the earthed walls of transformers, switchgear and substation structures. An integral part of this function involves meeting all the electrical, thermal and mechanical requirements of the application....

Portuguese Utility Aims to Enhance Green Image & Reliability KPIs

May 10, 2019 • ARTICLE ARCHIVE, Utility Practice & ExperienceComments (0)

May 2016 marked a milestone for Energias de Portugal (EDP) as the entire country kept its lights on for four consecutive days using only electricity generated by wind, hydraulic, biomass and solar power. This was apparently a first in Europe, if not the...

Corona Cameras Help Inspect Composite Insulators

May 4, 2019 • Camera, CoronaComments Off on Corona Cameras Help Inspect Composite Insulators

Development of latest generation compact UV cameras has been a positive development for utilities, allowing for more practical routine inspection of lines and equipment. For example, it has not always been possible to say anything definitive about the...

Switching & Lightning Protection of Overhead Lines Using Externally Gapped Line Arresters

May 4, 2019 • Arresters, ARTICLE ARCHIVEComments (0)

The goal of a lightning proof transmission line has been attainable since the early 1990s when the first polymeric-housed transmission line arresters became available. Indeed, based on IEEE 1410 and IEEE 1243, installation of arresters on every phase of every...

Dealing with Deterioration of Silicone Insulation in Critical Applications

May 4, 2019 • ARTICLE ARCHIVE, Reporting from CIGREComments Off on Dealing with Deterioration of Silicone Insulation in Critical Applications

Field experience with composite insulators having polymeric housings is available now for over 40 years and the clear trend is that silicone rubber has become the material of choice. The main reason is its long-term, dynamic hydrophobicity, which can...

Coating Glass Insulators for Service in Severe Environments

May 4, 2019 • ARTICLE ARCHIVE, Glass, InsulatorsComments (0)

RTV silicone material has been used to prevent pollution flashovers at substations for more than 30 years. More recently, this same remedial measure has also been adopted by power utilities worldwide to resolve service problems due to extreme contamination...