Transmission & Distribution

Transformer Components Explained

Transformer components, including cores, windings, bushings, and insulation systems, enable voltage conversion, enhance energy efficiency, and ensure safe operation. They support electrical networks, substations, and industrial systems with reliability and durability. Transformer Components: Real-World Examples and Uses Primary Components and Structure The main transformer components include the core, windings, insulating oil, tap changer, cooling system, and safety devices. At its most fundamental level, a transformer consists of two windings—primary and secondary—wound around a magnetic core. Primary winding: Connected to the input voltage source, it generates a magnetic field when current flows. Secondary winding: Connected to the output load, it…

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Latest T&D Content

RTU and HMI Redundancy in Electrical Substations

RTU and HMI redundancy enhances SCADA reliability with failover, hot standby controllers, mirrored databases, dual networks, and fault tolerance, delivering high availability, minimized downtime, and resilient industrial automation for critical process control. RTU and HMI Redundancy Explained As the substation RTU takes on more applications, such as Human-Machine-Interface (HMI), alarm annunciation, math & logic and “relay communication processing”, its need for high availability increases. Anything that takes the RTU out of service – configuration change, firmware update, or component failure – means not only loss of SCADA but also loss of local visibility, loss of non-operational data and, in…

Thermal Energy Storage

Thermal energy storage stores heat or cold for later use, thereby boosting efficiency, supporting renewable energy sources, and reducing peak demand. Balancing supply and demand enhances sustainability, reliability, and energy management. Thermal Energy Storage Overview and Best Practices To understand where thermal energy storage fits within the broader picture, see our overview of 'What is Energy Storage,' which compares the technologies shaping the future grid. Thermal energy storage is a crucial technology for enhancing efficiency and integrating renewable power sources across various types and applications. TES can enhance the efficiency of buildings, industrial processes, and power plants, while also facilitating the…

How utilities can keep the lights on

How utilities can keep the lights on? Strengthen grid resilience with smart grid upgrades, demand response, distributed energy resources, predictive maintenance, cybersecurity, and enhance outage management, load forecasting, and renewable integration to ensure reliability. How Utilities Can Keep the Lights On? Utilities worldwide have been on a roller-coaster ride, and an often painful one, over the past decade. Despite the sharp growth in global demand for electricity, many utilities have lost value or posted below-average returns. A McKinsey analysis of 50 major publicly listed utilities from Asia, Europe, and North America showed average total cumulative returns to shareholders of…

Smart Substation and the Evolving Grid

Smart substation systems use digital sensors, IEC 61850 communications, IEDs, and real time analytics to automate protection, monitoring, and control, improving reliability, power quality, cybersecurity, and DER integration across modern substations. The Smart Substation Explained A smart substation is best understood not as a single technology shift, but as a change in how substations behave day to day. Instead of acting as largely silent infrastructure that only draws attention during failures, these facilities now observe themselves continuously, exchange information digitally, and react at machine speed when conditions change. Protection, control, and monitoring are no longer isolated functions handled by…

IEC 61850 Protocol For Substations

IEC 61850 protocol enables fast, standardized communication between intelligent electronic devices (IEDs) in substations. It supports interoperability, real-time data exchange, and remote monitoring, making it vital for smart grid automation and modern power system protection. IEC 61850 Protocol Fundamentals IEC 61850 is a communications protocol developed by the International Electrotechnical Commission (IEC) for substation automation systems. Unlike older legacy protocols that rely on fixed, vendor-specific formats, IEC 61850 uses an object-oriented data interoperability and abstract communication services to create a standardized method for data exchange among IEDs, SCADA system integration, and Human-Machine Interfaces (HMIs). Its architecture is based on…

Keeping the Lineman and His Work Site Safe

Linemen and His Work Safe outlines OSHA compliance, PPE, fall protection, energized-line procedures, lockout/tagout, arc-flash mitigation, and hazard assessments to protect utility crews working on high-voltage distribution, transmission, and substations. A Practical Guide to Linemen and Their Work Safety Line-construction contractors can do their best to train the management, offer safety training and equipment and trust the foremen who are appointed to a job, but it is an inherently dangerous business. Despite all the safeguards, some new linemen say this is what some foremen tell them about safety procedures: “That’s the way you may have learned it in training,…

Substation Cybersecurity Explained

Substation cybersecurity protects power grid infrastructure from cyber threats by securing communication networks, IEDs, and SCADA systems to ensure grid reliability and safety. Applications of Substation Cybersecurity in Modern Power Systems As power systems become increasingly digitized and connected, the importance of cybersecurity in substation and grid communications has grown exponentially. With the integration of intelligent electronic devices (IEDs), SCADA systems, and remote monitoring, modern substations are now part of a broader cyber-physical infrastructure. While these technologies enable real-time control and improved reliability, they also expose utilities to cyber threats that can disrupt critical services and damage essential assets.…

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T&D Articles From ET Magazine

From Protection to Prediction: How AI Is Changing Substation Maintenance and Operations

For decades, substation protection and substation maintenance were treated as separate disciplines. Protection relays existed to detect faults and trip breakers within milliseconds. Maintenance programs existed to inspect, test, and replace equipment on a schedule largely driven by time or manufacturer recommendation rather than actual equipment condition. Artificial intelligence, applied to the data already flowing through a modern digital substation, is beginning to dissolve the line between those two functions. The Data Was Already There The single biggest enabler of AI-driven substation analytics is not a new sensor or a new algorithm. It is the fact that IEC 61850 digital…

Substation Cybersecurity in the Digital Era: NERC CIP, IEC 62443, and Protecting the IEC 61850 Network

Every benefit that digital substations and IEC 61850 networking bring to T&D operations comes with a corresponding increase in attack surface. A substation built around hardwired analog relays has very little in common, from a cybersecurity perspective, with a substation where protection, control, and monitoring functions all communicate over a shared Ethernet network. Securing that network has become as important to substation engineering as the protection coordination study itself. Why Digital Substations Change the Threat Model In a conventional substation, an attacker who wanted to disrupt protection or control functions generally needed physical access to specific wiring or devices. In…

Substations in a DER-Heavy Grid: DERMS, FLISR, and Grid-Enhancing Technologies

The substation was originally designed to manage power flowing in one direction, from generation through transmission and into distribution feeders that carried it to passive customers. That assumption no longer holds. Rooftop solar, community battery storage, electric vehicle charging, and small-scale distributed generation now push power back through the same feeders the substation was built to manage outward only. Substation engineering and the technologies operating inside the substation fence have had to adapt accordingly. The Hosting Capacity Problem Before a utility can approve a new interconnection request for solar or storage, it has to answer a deceptively difficult question: how…

Digital Substations and the IEC 61850 Standard: The Architecture Behind Today’s Smart Grid

For most of the history of the electric power industry, substations were built around copper. Thousands of meters of control cable ran between instrument transformers, protection relays, circuit breakers, and the control room, each wire carrying a single analog signal to a single device. That architecture worked for a century, but it does not scale to the demands of a modern, renewable-heavy, sensor-dense grid. The digital substation, built on the IEC 61850 communication standard, is the industry’s answer. What Makes a Substation “Digital” A digital substation is not simply a substation with computers added to it. The defining change is…