Overhead T&D

Electricity Transmission

Electricity transmission delivers high-voltage power from generating stations to substations across vast electrical grids. Using transmission lines, transformers, and substations, it ensures efficient energy transfer, grid stability, and reliable service to businesses and industries. Electricity Transmission Fundamentals History and Evolution of Transmission Early electricity networks in the late 1800s used direct current (DC), championed by Thomas Edison. However, DC was inefficient for long-distance delivery. Nikola Tesla and George Westinghouse pioneered alternating current (AC), which allowed voltage to be stepped up and down using transformers. This advantage made AC the global standard. Since then, transmission systems have expanded to…

Download Our FREE Overhead T&D Handbook

As utilities are faced with replacing rapidly aging transmission and distribution infrastructures, it is essential to be aware of the latest techniques, products and applications available on the market. Volume 1 of our Overhead & Underground T&D handbook series provides detailed information on testing and maintenance methods, the practical and theoretical applications of overhead transmission, and the unique challenges and opportunities presented by underground distribution networks. These topics and more are covered in detail in the 100-page first-volume handbook.

In this first volume, we explore the core principles and practices related to overhead and underground power transmission and distribution. We examine the key components of these systems, such as transmission lines, substations, transformers, cables, and switches, while delving into the design, installation, and maintenance of both overhead and underground configurations. Special attention is given to the unique challenges and considerations associated with each type of system—highlighting factors such as environmental conditions, reliability, safety standards, and operational efficiency.

This handbook is designed to assist engineers, utilities, technicians, and planners by providing practical insights and technical expertise for optimizing T&D systems. We cover essential topics such as grid infrastructure, fault detection, protection schemes, and the integration of emerging technologies like smart grids and renewable energy solutions. Whether you are involved in the planning of new installations or maintaining existing systems, Volume 1 offers the tools and guidance necessary for ensuring the safe and efficient delivery of power.

With a blend of theoretical concepts, industry best practices, and real-world applications, Overhead & Underground T&D Handbook, Volume 1 aims to be an indispensable reference for professionals seeking to deepen their understanding of transmission and distribution systems, and to navigate the evolving challenges of modern electrical networks.

Latest Overhead T&D Articles

What is a Microgrid?

A microgrid is a localized energy system that can operate independently of or in conjunction with the main grid. By integrating renewable energy, storage, and smart controls, it enhances reliability, supports sustainability, and provides backup power for critical facilities. What is a Microgrid? Microgrids are gaining popularity as reliable and efficient solutions for modern energy challenges. They are increasingly valuable as the world pursues cleaner energy sources, carbon reduction, and grid modernization. By complementing smart grid infrastructure, they improve system reliability while helping communities and industries adapt to the demands of today’s evolving power networks. What Defines…

Electrical Distribution System

An electrical distribution system is the portion of the electric power grid that delivers electricity from distribution substations to end users through feeders, transformers, and service connections operating at medium and low voltage levels. It forms the physical link between transmission supply and electrical utilization by stepping voltage down and distributing it across local networks. The system connects substations to loads through primary feeders and secondary circuits, which carry power from medium voltage networks to low voltage service points. This relationship defines how electrical energy moves from a bulk supply into a usable form without describing operational control or delivery…

Costly Interconnection Delays

Costly interconnection delays stall grid connection for solar, wind, and storage, driven by interconnection queue backlogs, transmission constraints, lengthy permitting, and network upgrade studies, inflating project CAPEX, financing risk, and PPA timelines. Costly Interconnection Delays and Their Impact on Workplace Safety Policy debates on solar incentives and valuation make headlines across the nation, but less attention is paid to the nuts and bolts of solar installation: the interconnection process.But the struggle there is very real. Take Hawaii, where the high volume of solar applications and the slow interconnection process slowed distributed solar installations two years ago. Eventually, the process…

Distribution Automation for Feeder Fault Isolation and Grid Reliability

Distribution automation allows utilities to detect feeder faults, isolate the damaged section, and restore service through automated switching and FLISR control logic. Faster fault isolation shortens outage duration and improves feeder reliability across modern distribution systems. Distribution automation determines how quickly a distribution feeder can recover from faults. When switching decisions rely on manual inspection and operator judgment alone, outages propagate across larger sections of the network and restoration takes longer. Automated sensing and switching reduce that exposure by isolating the faulted section while preserving service to unaffected customers. Utilities deploy distribution automation to reduce outage duration, improve feeder reliability…

Electrical Distribution Equipment Selection

Electrical distribution equipment includes transformers, switchgear, reclosers, regulators, insulators, and fuses whose selection affects fault isolation, voltage control, restoration speed, maintenance burden, and feeder reliability during faults. Electrical distribution equipment is the field hardware that determines whether a feeder stays controllable after something goes wrong. The issue is not naming devices from a catalog. It is whether the installed mix of switching, protection, transformation, insulation, and voltage-control devices can keep the problem contained when load shifts, a section faults, or crews must reconfigure the circuit. A feeder can appear complete on a one-line drawing yet perform poorly in service. An…

When it Comes To Digital Marketing, Novice Sailors Can Navigate Calm Waters But Rough Seas Require Expert Sailors...

Digital Marketing Tip: leverage SEO, content marketing, PPC, social media, and analytics to drive qualified traffic, improve engagement, increase conversion rates, and optimize ROI through data-driven testing, segmentation, and continuous optimization. Digital Marketing Tip Explained Yes, the current business storm is increasingly difficult to navigate because of the Covid-19 pandemic. So, why is it a bad time to cut your advertising budget?History has a great way of teaching us lessons. During tough economic times, it might seem logical to make cuts to your advertising budget, but in reality, that’s not a sound idea, as it actually hurts your business.…

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Transmission Construction Industry Leader Retires and Sells at Absolute Auction!

S.E., Inc. has been providing the very best in Transmission Powerline Construction for over (40) years throughout the Western United States. Brothers Mark, Steve, David, and Craig Sorenson have decided to retire and pursue other interests. Everything in the auction is owned by S.E., Inc. and will positively sell to the highest bidder without minimum or reserve! S.E., Inc. has hired Hunyady Auction Company to conduct their liquidation. Hunyady Auction Company is celebrating their 35th year in business and specializes in liquidation auctions of electrical construction companies plus many other industries. Transmission and Distribution (T&D) professionals have a unique opportunity…

Why Net-Zero is Cheaper for the UK

The United Kingdom has set an ambitious target to achieve net-zero greenhouse gas emissions by 2050. This goal necessitates a comprehensive transformation of various sectors, including energy, transportation, and agriculture. While the environmental imperatives are clear, there is growing evidence that this transition could also yield significant economic advantages for the nation. Energy Sector Transformation A pivotal component of the UK's net-zero strategy involves a substantial shift towards renewable energy sources. By 2040, projections suggest that wind and solar power will supply approximately 80% of the country's electricity needs. This transition is expected to reduce energy imports, enhancing national energy…

FERC Complaint Targets Duke, PJM Transmission Planning

A coalition of large energy consumers and ratepayer advocates has filed a complaint with the Federal Energy Regulatory Commission (FERC), urging the agency to prohibit transmission owners from independently planning "local" transmission projects exceeding 100 kilovolts (kV). The coalition argues that such local planning, lacking independent oversight, leads to inefficient and costly transmission development, resulting in unjust and unreasonable rates for consumers. Background Transmission planning involves determining the necessary infrastructure to transport electricity from generation sources to consumers. In the United States, this planning is typically conducted by transmission owners, which are often investor-owned utilities. These entities are responsible for…

How Dangerous is Linemen Work?

Many occupations pose risks to workers, but few match the dangers that linemen face daily. Linemen play a critical role in maintaining and restoring the power grid, often working in extreme weather conditions, at significant heights, and around high-voltage electrical systems. Their work is essential to modern life, yet it comes with life-threatening hazards. Statistics highlight the dangers of lineman work. The fatality rate for lineworkers is nearly four times higher than the national average for all occupations. Each year, an average of 26 linemen lose their lives due to work-related injuries. Additionally, linemen experience a non-fatal injury rate of…

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