Voltage Sags (Dips) and Swells in power quality measurements Voltage sags (also known as voltage dips) and swells (or surges) are the most common types of power quality disturbances. Every electrical system or equipment is designed to work at a specific voltage rating and changes in voltage below or above the defined low and high [...]
Voltage Flicker and Voltage Fluctuations in power quality measurements Flicker refers to the perceived fluctuation in light intensity that occurs when voltage fluctuations impact lighting systems. It is often caused by rapidly changing loads in the electrical network. It can be visually discomforting and can affect the performance and lifespan of sensitive equipment, especially in [...]
Harmonics Don’t Exist – and How We Measure Them In the world of power quality there is one topic that constantly captures the imagination of electrical engineers: harmonics. In today’s power system, where electrical loads are increasingly complex and evolving, so too are the concepts that surround harmonics. We are seeing the introduction of terms [...]
The Worlds 1st Ride Through Compliant SVC “kVAR Booster” Solution Asynchronous generators, including doubly-fed rotors, are widely used in wind farms. During voltage drops, any slight speed deviation of these rotors consumes large amounts of reactive energy. Due to the large demand for reactive power during significant voltage drops, FRT regulations have been implemented in [...]
Elspec UGM 2025 in Amsterdam Power Quality Expert attended the 3rd Elspec annual general meeting held in Amsterdam. Elspec produce a range of specialist power quality analysers utilising a patent technology, PQZIP, which allows their meters to store power measurements in a cycle by cycle resolution. Elspec also manufacturers power quality solutions including Power Factor [...]
Measurements of Short Circuit Loop Impedance in Photovoltaic Farms in IT Networks at Voltages up to 900V AC Loop impedance measurement on photovoltaic farms in IT systems with voltages up to 900V AC is one of the greatest challenges in modern PV system diagnostics. High voltages, the specifics of IT networks, the presence of inverters, [...]
Comprehensive diagnostic testing of electric vehicle charging stations using the Sonel EVSE-100 multifunction analyser The dynamic growth of electromobility calls for modern diagnostic tools that can ensure the safety and reliability of electric vehicle charging stations. One such solution is the Sonel EVSE-100 – a multifunction analyser specifically designed to comprehensively test EV charging infrastructure. [...]
The Iberian Blackout: A Wake-Up Call for UK Grid Resilience and the Role of Advanced Monitoring On April 28, 2025, at precisely 12:33 CEST, the Iberian Peninsula plunged into darkness. A massive blackout swept across Spain and Portugal, silencing cities, halting businesses, and disrupting the lives of millions. Over 20 gigawatts of power capacity vanished [...]
Energy as a strategic resource to support growth. The ISO 50001 Energy Management System certification of Amadori Group The degree of awareness of the “energy problem” for Italian companies that emerged from the research carried out at the end of 2012 from the Politecnico di Milano (Energy Efficiency Report – November 2012) is rather bleak. [...]
Measurement of the I-V characteristics of PV panels using the Sonel PVM-1530 Max in accordance with IEC 61829 The measurement of current-voltage (I-V) characteristics of photovoltaic panels plays a key role in evaluating system efficiency and detecting potential issues within a PV installation. Learn how to perform accurate measurements in compliance with IEC 61829 using [...]
