Overhead T&D

Disaster & Recovery

Outage Management Review: When the Lights Go Out

The occurrence of severe weather events is on the rise at an alarming rate. According to the Insurance Bureau of Canada, extreme weather events that used to happen once every 40 years now occur as frequently as every six years in some regions; severe weather is expected to become even more frequent...

Pole Line Hardware

A New Age for Toughened Glass Insulators - With Clarity Comes Safety

INTRODUCTIONIn 2005 an article about toughened glass insulators (TGI) titled “Return to Clarity” was published. Fifteen years later, this sequel article by a team including the two original authors, picks up where the former concluded with optimism about the future of TGI technology...

Overhead Distribution

Outage Management: Restore Power in Less Time

Improving power grid reliability is a major goal of the electric power industry and can reduce economic losses, lost productivity, and customer inconvenience from power disruptions. For several utilities, Smart Grid Investment Grant (SGIG) funding accelerated the application of fault location,...

Underground Distribution

Safety in Underground Power Systems

Protecting utility personnel working below ground BY MIKE DOHERTY, PowerTel Utilities Contractors Limited "Safety” in “underground systems” has different connotations for different sectors depending on the tasks performed. “Qualified electrical workers” can have...

Outage Management & Restoration

ARCOS Callout and Scheduling Solutions

Using the ARCOS Callout and Scheduling solutions, GVEA’s supervisors, dispatchers and line workers, among others, will be able to plan, launch and track the status of automated, after-hours calls for emergency crews from their desktops, tablets and smartphones. GVEA will begin rolling out the...

Conductors & Materials

The Evolution / Revolution of Overhead Conductors… and why it matters

Brief Background: In the early 1900's Aluminum Conductor Steel Reinforced (ACSR) conductor was developed to replace copper wires, due to the war effort when copper was needed for munitions. In the 1970's growing demand for electricity inspired the development of higher capacity Aluminum Conductor...

Home T&D Technologies Overhead T&D

High Voltage AC Transmission Lines

Three-phase electric power systems are used for high and extra-high voltage AC transmission lines (50kV and above). The pylons must therefore be designed to carry three (or multiples of three) conductors. The towers are usually steel lattices or trusses (wooden structures are used in Germany in exceptional cases) and the insulators are generally glass discs assembled in strings whose length is dependent on the line voltage and environmental conditions. One or two earth conductors (alternative...

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