Overhead T&D

Outage Management & Restoration

The End of the Road for Transmission Incentives

In a significant shift, the Federal Energy Regulatory Commission (FERC) has decided to abandon its transmission incentives policy, particularly the construction work in progress (CWIP) incentives. This decision marks a pivotal change in how transmission projects are financed and regulated,...

Underground Distribution

Underground Smart Grid

In recent years, the cost to bury high-voltage power lines has decreased dramatically. The American Transmission Company reports that installation costs for underground transmission lines (over 100 kilovolts) are now only 2.5 to 10 times the cost of an equivalent overhead line. Consequently, the...

Pole Line Hardware

Transmission Line Resiliency

Resiliency is a term used more and more by transmission line stakeholders including designers, operators, and owners. Resilience is simply defined as toughness or the capacity to recover quickly from difficulties. It can be used to describe a system, an object or even a person. Dr. Ginsburg, child...

Case Study

Case Study: Rapid Changes in Bushing Health

IntroductionContinuous online monitoring of bushings provides real-time information which can result in the early detection of a possible failure. Challenge: A Major AlarmA prominent U.S. utility was looking for a way to improve system reliability for their 138kV assets. They researched and...

Conductors & Materials

Fiber-Reinforced Composite Cross Arms for Transmission Structures

Fiber-reinforced polymers versus traditional cross arms materials BY JANOS TOTH & GRANT LOCKHART, FRP Transmission Innovations Inc. Recently, utilities have started using newer options such as component polyurethanes instead of older, widely used conventional materials. Specifically,...

Distribution Protection

ArmorBuiltTM Wildfire Shield Proven Protection for Utility Poles

IntroductionIn November of 2018, the deadliest, most destructive wildfire in California history burned a total of 240 square miles, destroyed 18,804 structures and resulted in 85 civilian fatalities. Known as the Camp Fire, it devastated several communities including the towns of Paradise and...

Home T&D Technologies Overhead T&D

Reducing Partial Vacuum Induced Flashovers in 25 kV Class Loadbreak Separable Connectors

The 25 kV Class 200 Ampere loadbreak separable insulated connector system didn't always have today's reputation for safety and reliability. As 25 kV Class loadbreak connectors increased in popularity in the 1980's and 1990's, utilities reported unacceptably high numbers of flashovers during energized switching operations. These line-to-ground faults were more likely to occur in colder weather, at higher altitudes, with lower load currents, and with stuck interfaces. The partial vacuum induced flashovers were not seen in 15 kV Class...

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