The global energy landscape is undergoing a seismic shift, driven by the integration of renewable sources like wind and solar. This transition from centralized, fossil-fuel-based generation to distributed, inverter-based resources (IBRs) presents unique challenges for grid protection, with overvoltage management being paramount. At the heart of this defense are modern surge arresters, whose role and configuration strategies have evolved dramatically to ensure the stability and reliability of today's complex power grids.
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The evolution of the traditional power grid into a Smart Grid is fundamentally driven by the integration of intelligence, connectivity, and data analytics into its physical infrastructure. Among the critical components safeguarding this infrastructure are surge arresters (SAs), traditionally passive devices that protect equipment from lightning strikes and switching overvoltages by diverting excess current to earth. In the Smart Grid paradigm, these vital protectors are transforming into active "Guardian Nodes" through the integration of advanced monitoring capabilities. This transformation enables real-time condition awareness and paves the way for predictive maintenance, dramatically enhancing grid reliability and operational efficiency.
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In the intricate ecosystem of a modern power grid, ensuring the relentless reliability and longevity of expensive equipment is paramount. Among the myriad threats to transformers, circuit breakers, and switchgear, transient overvoltages stand out as a pervasive and potentially catastrophic risk. These short-duration, high-amplitude voltage spikes can originate from lightning strikes (external) or switching operations within the grid itself (internal). The first and most critical line of defense against this invisible threat is the Surge Arrester (SA). This article delves into the core functionality of surge arresters and provides a structured framework for selecting the optimal protection scheme for your grid assets.
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For decades, the core mission of the surge arrester has remained constant: to protect electrical equipment from transient overvoltages, whether caused by lightning strikes or switching operations, by providing a low-impedance path to earth and swiftly restoring normal system operation. However, the means to achieve this mission are undergoing a radical transformation. Driven by the demands of modern power grids—increasing renewable integration, digitalization, and the need for greater reliability—arrester technology is moving beyond its traditional, passive role into an era of smart, adaptive, and highly resilient components.
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Transmission line surge arresters (TLSAs) have become an important design and mitigation alternative to improve grounding and reduce investment in overhead ground wire. However, they have also been known to experience a number of mechanical problems in service.
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As in places such as Japan where lightning accounts for more than 50% of power system failures, a high proportion of all transmission line trippings in China are due to lightning strike. For example, operating data for 500 kV lines across five provinces within the China Southern Power Grid showed that, of the 62 total trip-outs registered during one year, 87% were linked to lightning.
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Transient Recovery Voltage (TRV) of a circuit breaker is voltage difference measured between each side of the circuit breaker to ground. The most severe TRV from an amplitude point of view follows interruption of the first phase to clear an ungrounded three-phase fault.
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The 400 kV Gutinas-Brasov overhead line is located in a mountainous area of Romania that has mostly rocky soil. Thick ice covers conductors during winter and in the past caused breakage of shield wire such that it had to be dismantled in the most severely affected sections.
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Power system engineers all face a similar dilemma at one time or other when trying to identify which product offers the quality they require – especially in today’s global market with its many competing suppliers.
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As surge protective devices, arresters mitigate the impact of events that might otherwise trigger outages and monitoring them has become part of an industry-wide trend toward greater condition assessment of key network components.
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Two types of fault currents can appear on power systems: ground and phase-to-phase. The more important when it comes to surge arresters is the first, which is basically the current that flows through the circuit when there is a short to ground.
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American Transmission Company (ATC) own and operates transmission lines in the States of Wisconsin, Michigan, Minnesota and Illinois. The system originally belonged to local utilities that had different standards and this resulted in a variety of different line surge arrester installations at 69 kV and 138 kV.
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Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this is from an oil or SF6 insulation environment to air.
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Not long ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, sending high velocity porcelain shards in all directions.
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There are a variety of reasons why an arrester might reach such a state.
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