Power Systems Protection

What happens to a renewables-powered grid when El Niño changes the weather? With update from NOAA: National Oceanic & Atmospheric Administration's Climate Prediction Center, this question is no longer hypothetical. The ENSO Alert System is on El Niño Watch, and the numbers have tightened sharply: 🌡️ 82% chance of El Niño emerging in May–July 2026 🌡️ 96% chance of El Niño continuing through December 2026–February 2027 🌡️ Equatorial subsurface temperatures in the Pacific have risen for six consecutive months Peak strength remains uncertain, but the direction of travel is clear. El Niño doesn't just warm the Pacific. It redistributes rainfall, shifts wind patterns and alters solar radiation across continents. For an electricity system increasingly built on weather-dependent generation, that has direct, measurable consequences: ⚡ Hydropower under stress. During the 2023–2024 El Niño, the Kariba Dam — which powers most of Zambia and Zimbabwe — saw output collapse as the reservoir hit record lows. In Colombia, 80%+ hydro-dependent, even mild El Niño years have reduced reservoir inflows by ~14%. Sudan and Namibia also saw sharp drops in hydropower availability. ⚡ Wind and solar shift, not stop. Wind speeds weaken across parts of South Asia and the Caribbean during El Niño; solar radiation increases in some drought-affected regions and decreases under shifted monsoon patterns elsewhere. The pattern is regional, not uniform — which is why granular forecasts matter. ⚡ Demand spikes. Hotter conditions surge cooling demand across South and Southeast Asia, Central America and the southern US, often at exactly the moment when supply is squeezed. The WMO–IRENA 2024 Year in Review shows that ECMWF seasonal forecasts can now successfully anticipate regional anomalies in solar energy potential and electricity demand months in advance. That is a genuine operational breakthrough for grid planners, traders and policymakers. https://lnkd.in/epwvHkhY Research on Latin America has shown that strategically combining wind, solar and hydro — exploiting their natural geographic and temporal complementarity — can reduce renewable power variability by up to 65% and increase the minimum monthly threshold of available renewable power by up to 5x, including during El Niño droughts. This is where World Meteorological Organization's energy-meteorological services meet energy security. And it is exactly the kind of work that will define whether the clean energy transition holds up under the stress tests climate change keeps sending its way. NOAA CPC ENSO Diagnostic Discussion (14 May 2026): https://lnkd.in/ez4REFDT

An electrical substation may look like a collection of steel structures, but each component has a specific job. Electricity generated enters the transmission line, passes through equipment designed to protect, isolate, measure, transform, control, and safely deliver it to the distribution network, and finally to end users. Seems basic, right? Understanding these components and how they work together is fundamental for anyone working in power systems. Now, here are some of the major components you will typically find in a substation: 1. Power Transformer: Changes voltage from one level to another while transferring electrical power between systems. 2. Circuit Breaker: Interrupts normal and fault current when commanded by protection or control systems. 3. Disconnect Switch: Provides an isolation point, often with visible separation, so equipment can be safely taken out of service. Standard disconnects are generally not intended to interrupt significant load or fault current unless specifically rated for that duty. 4. Current Transformer (CT): Reproduces primary current at a reduced, standardized level for protection, metering, and monitoring. 5. Voltage Transformer (VT/PT) or CVT: Provides a reduced representation of the high-system voltage for relays, meters, synchronization, and control systems. 6. Surge Arrester: Limits transient overvoltages caused by lightning and switching events to help protect equipment insulation. 7. Busbar: Provides the electrical connection point that allows power to be routed among lines, transformers, breakers, and other equipment. 8. Shunt Reactor: Absorbs reactive power and can help control excessive voltage, particularly on lightly loaded long transmission lines or cable systems. 9. Capacitor Bank: Supplies reactive power to support voltage and, depending on the application, improve system performance and power factor. 10. Protection Relays: Continuously evaluate electrical quantities and initiate breaker trips when defined abnormal or fault conditions are detected. 11. Station Battery & DC System: Provides dependable DC power for protection, control, communications, alarms, and breaker tripping/closing—even if station AC power is lost. 12. Grounding Grid: Provides a controlled path for fault current and helps manage dangerous touch and step potentials throughout the substation. And behind all of this are SCADA, RTUs/RTACs, communications, control panels, station service systems, insulators, conductors, cables, and security systems working together. I find this fascinating about substations because no single piece of equipment makes a substation work; it takes a combination of many pieces. The transformer may handle hundreds of MVA, but without reliable protection, DC power, breakers, instrument transformers, grounding, and communications, the system cannot operate safely and reliably. #ElectricalEngineering #PowerSystems #Substation #PowerEngineering #GridModernization #ElectricalSafety #HighVoltage

In the third part of my Understanding Energy Resilience series, I want to start with something many of you will have seen in the news: recent drone disruptions at major airports. Munich having to temporarily close its airspace. Oslo halting landings. Copenhagen pausing operations for hours. These incidents showed how quickly one small object can halt a critical service, create chaos and cost millions. Now take that thought to energy. If a drone over a runway makes headlines, a drone over energy infrastructure often doesn't. Yet the consequences can be just as real: disruptions to electricity supply, halted rail services and factories forced to stop production. Across Europe, operators are not allowed to neutralize hostile drones themselves – even when a threat is visible above critical infrastructure. Simply put: the rules have not caught up with reality. In my view, clarity and speed here are essential for public safety. Next to physical threats we also face digital ones. Every hour, around 35 million cyberattacks happen worldwide – almost 10,000 every second. Around 5% of them target energy companies and infrastructure. This is the world we operate in: attacks can appear out of nowhere and put entire systems to the test in real time. From my perspective, defending energy infrastructure comes down to a few key priorities: 1️⃣ Let protection happen: Regulation needs to enable energy operators to protect themselves. Clear rules must define who can intervene, when and how – including stopping a hostile drone. We cannot afford hesitation while minutes turn into outages. 2️⃣ Treat physical and digital as one: Fences, cameras and access control on the ground. Network separation and continuous monitoring in the control room. Physical and digital security must be treated as one because if someone can walk in, they can often plug in and disrupt the system. 3️⃣ Harden the infrastructure no one can afford to lose: The majority of physical and cyberattacks on energy systems target a small number of high-impact sites – such as substations, control rooms and interconnectors. Better detection and stronger barriers here make the difference between local disturbance and national outage. 4️⃣ Practice recovery, not just prevention: Real resilience is measured in how quickly power is restored. Simple restart plans, spare parts ready on site and regular drills with operators and authorities turn days in the dark into hours. 5️⃣ Stop naivety – talk openly about risk: We need public awareness without drama – which is one of the reasons I started this series. The more people understand that drones over critical sites are serious and that malware or phishing mails are no joke, the more support there will be for sensible protection. I believe this is the right balance: clear authority to act, practical protection on the ground and in the network with a constant focus on rapid recovery. In a more contested world, that is how energy systems stay open for business.

"Service reliability math that every engineer should know" I think it's useful for engineers to understand what uptime and reliability mean in practice. These numbers paint a good picture of what's involved :) Now while service reliability is often reduced to a simple percentage, the reality is far more nuanced than those decimal points suggest. First, not all downtime is created equal. A single 8-hour outage has dramatically different business implications than 480 one-minute outages, even though both sum to the same annual downtime. This distinction is particularly relevant when considering service level agreements (SLAs) and how they’re measured. The impact of downtime also varies significantly based on when it occurs. Five minutes of downtime during peak business hours might cost more than an hour of downtime during off-hours. This temporal aspect of reliability is often overlooked in simple percentage calculations. Each additional nine of reliability typically requires an order of magnitude more engineering effort and operational complexity. Moving from 99.9% to 99.99% isn’t just a matter of being "10 times more reliable" – it often requires fundamental architectural changes: At 99.9% (8h 45m downtime/year), you might get away with single-region deployment and basic failover At 99.99% (52m 35s), you’re typically looking at multi-region deployment, sophisticated health checking, and automated failover At 99.999% (5m 15s), you need redundancy at every layer, real-time monitoring, and likely some form of active-active deployment At 99.9999% (31s), you’re dealing with advanced techniques like chaos engineering, automated canary deployments, and sophisticated traffic management While understanding the basic math of service reliability is crucial, the real engineering challenge lies in understanding the context, trade-offs, and business implications of reliability decisions. The next time you see a reliability requirement, don’t just think about the percentage – think about the entire socio-technical system required to achieve and maintain that level of service. The numbers are simple. The engineering reality behind them is anything but. #softwareengineering #programming

There ya have it folks... The exact reason we use trench boxes... Trench boxes, also known as trench shields, are crucial pieces of safety equipment in excavation projects, as they significantly reduce the risk of trench collapses and related injuries or fatalities. By providing a stable barrier, trench boxes prevent soil from caving in and crushing workers, creating a safer environment for those working in trenches. Here's why trench boxes are so important for safety: Preventing Cave-ins: Trenches, especially those dug in unstable soil or at significant depths, are prone to collapses. Trench boxes act as a shield, preventing the walls of the trench from caving in and potentially burying workers. Minimizing Risk of Injury and Death: Trench collapses are a leading cause of construction site fatalities. Trench boxes significantly reduce this risk by providing a safe space for workers to operate within the trench. Enhancing Efficiency: When workers feel safe, they can focus on their tasks and work more efficiently. The stability provided by trench boxes can also prevent project delays caused by cave-ins, further contributing to productivity. Complying with Regulations: Many safety regulations, such as those from OSHA, mandate the use of protective systems like trench boxes in certain trenching situations. Beyond simply being present, trench boxes must be used correctly: Proper Installation: Trench boxes must be installed according to manufacturer's instructions and relevant regulations, ensuring they are properly sized and positioned for the specific trench and soil conditions. Safe Access and Egress: Trenches deeper than 4 feet require a safe means of access and egress, such as a ladder or ramp, for workers to enter and exit the trench without risk. Competent Person Oversight: A competent person, trained in trench safety, is essential for inspecting the trench, soil conditions, and the proper use of the trench box.

If You Never Considered This... You Should Now Protecting People Using Exclusion Zone Lighting In my 20+ years in Occupational Health and Safety, I’ve conducted countless risk assessments, led site safety briefings, investigated incidents, and sat through many safety budget meetings. But not once in those discussions did I hear about Exclusion Zone Lighting. Maybe this solution wasn’t available back then. Maybe it wasn’t visible to us. But now that I’ve seen it, I can’t ignore it. And I believe we, as HSE professionals, should not ignore it either. If you’re working in the civil construction industry or around heavy machinery, you already know how much we rely on flagmen or banksmen to guide vehicle movement and keep operations flowing. But have we ever really asked: → What protects the flagman? → What safeguards the person standing closest to danger? I’ve come across incident reports where spotters were seriously injured or worse due to blind spots, sudden machine movements, or simply being too close. This is where Exclusion Zone Lighting becomes a meaningful innovation. It’s not just lights. It’s a visual warning system that projects clear, high-visibility safety zones instantly telling workers and pedestrians where it’s safe to stand… and where it’s not. Benefits like: → Extra reaction time for people on the ground → Reduced blind spot incidents for equipment operators → Safer working environments especially in low visibility or high-traffic areas This isn’t limited to one machine or one site. It’s applicable across: → Forklifts → Dumpers → Rollers → Cranes → Pavers → Lorries → Vans And sites like: → Construction zones → Waste plants → Quarries → Roadwork sites → Logistics yards Let’s be honest : cones, signs, and reflective jackets served their time. But safety isn’t about tradition.  It’s about protection. So here’s my message to fellow safety professionals and project decision-makers: Start bringing innovations like this into your conversations. Introduce it during your next risk assessment. Add it into your next safety budget discussion. At the very least, start talking about it. I’m committed to including this in my future projects and recommendations. Because safety must evolve. We can’t keep doing safety the way we’ve always done it. We must lead the way by embracing smart, proactive solutions that actually save lives. If you want to learn more about this solution,  Visit the link in the comment below or connect with Carl Evans.

🔴 The Spanish power system collapsed within seconds following a double contingency in its interconnection lines with France. First, a 400 kV line disconnected, and less than a second later, a second line also failed, suddenly isolating Spain while it was exporting 5 GW of power. The frequency rose abruptly, triggering the automatic disconnection of approximately 10 GW of renewable generation, programmed to shut down when exceeding 50.2 Hz. This led to a sudden energy shortfall, a sharp frequency drop, and within just nine seconds, a total system blackout. 🪕 The causes of the incident are attributed to low rotational inertia (only about 10 GW of synchronous generation online), identically configured renewable protections that reacted simultaneously, reserves that were inadequate for such a high share of renewables, and an under-dimensioned interconnection with France. Could this have been avoided? Several measures could help prevent similar situations in the future, such as requiring synthetic inertia in large power plants, reinforcing the interconnection with France, and establishing a fast frequency response market, among others. 💡 In this context, Battery Energy Storage Systems (BESS) are more essential than ever. These systems can provide synthetic inertia, ultra-fast frequency response, and backup power in critical situations—capabilities that today’s renewable-dominated system cannot ensure on its own. By reacting in milliseconds, BESS help stabilize the grid during sudden frequency deviations, preventing massive disconnections and buying time for other reserves to activate. Their strategic deployment, combined with appropriate regulation, would make these systems a cornerstone of a more secure and resilient future power system. ... ✋️Please note that this post was written based on the information published on or before its release. Root cause analysis is still ongoing and updates will be released with the outcomes of the investigation. The goal is to show the features that can be provided by BESS within the wide portfolio of solutions applicable in these cases. All inisghts are highly welcome and appreciated in order to enrich our collective understanding. ... 📸 Reid Gardner Battery Energy Storage System (Nevada, USA) A real-world example of how BESS ensures grid stability by delivering synthetic inertia and fast frequency response—essential in a renewable-heavy energy mix.

This week alone, we’ve replaced 4 transformers across different sites—each less than 5 years old. We’ve also rebuilt 2 switchboards that suffered flashovers, and we’ve already got the orders in to completely renew them. All of them were tied to solar sites. All of them were avoidable. Let’s stop pretending this isn’t happening. Too many of these substations were built as an afterthought—thrown in cheap to hit grid connection deadlines and satisfy investors chasing returns, not long-term reliability. We’re seeing: Switchgear that’s corroded beyond repair in under 60 months Inverters dumping harmonics back onto the network with no mitigation Poorly specced protection schemes that offer no selectivity or grading Transformers undersized, under-ventilated, and overstressed from day one No provision for future battery integration or reactive power compensation This isn’t about bad luck. It’s about bad design. And it’s happening across the country. Some of these sites will never make it to year 10 without major intervention. Many will fail long before their PPA matures. And every time it’s the same story: “we didn’t think it needed to be that robust,” “we had a tight budget,” “we assumed it would last.” You don’t build a resilient energy future with assumptions. At Johnson & Phillips, we’ve built our reputation on fixing what others cut corners on. But make no mistake—our goal isn’t just to repair. It’s to raise the standard. Power distribution infrastructure matters. Substations are not just connection points—they’re the backbone of performance, safety, and scalability. If you build them like an afterthought, they will fail. And they are failing. This isn’t a warning. It’s already happening. If you’re operating, investing in, or building solar and storage sites—make your substation a priority. The quality of your entire system depends on it.

⚠️ Don’t Assume Solar Power Systems Are Safe. ☀️ They Demand Extreme Safety Standards. Solar energy is clean, powerful — and potentially dangerous if not engineered, installed, and maintained with precision and care. 🛑 High DC voltages 🛑 Arc faults 🛑 Fire hazards 🛑 Inverter failures 🛑 Poor grounding or insulation — are real risks in poorly designed or neglected solar systems. 💡 Safety is not an afterthought — it’s the foundation. Every solar power plant must follow strict electrical codes, use high-quality components, ensure proper grounding, and have trained professionals involved at every step. Whether it's a rooftop system or a megawatt-scale solar farm, safety must be: ✅ Engineered ✅ Tested ✅ Maintained ✅ Monitored A single mistake can lead to major losses — not just of equipment, but lives. Let’s raise the bar. Let’s treat solar energy with the same respect we give to any high-power system. Because sustainable energy without safety is a false promise.