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Timeline of Relay Protection Development
In 1901, the induction-type overcurrent relay was introduced, followed by ASEA (now ABB) launching the first time-delay overcurrent relay, TCB, in 1905, enabling graded protection. The current differential protection principle was proposed in 1908, and directional. SEL uses Real Time Digital Simulator (RTDS) testing to validate relay performance. RTDS testing helps engineers identify and resolve relay setting issues quickly, reducing risks and. The first protective relays were electromechanical devices, introduced in the early 20th century. These relays operated based on mechanical movement, with components like coils, springs, and armatures working together to detect abnormalities in the electrical system. Edison's dream of lighting the world using electricity spawned the largest industrial infrastructure in the world and enabled. Edmund Schweitzer with the first digital microprocessor-based protective relay, the SEL-21 digital distance relay/fault locator, and the SEL-T400L time-domain line protection relay.
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Photovoltaics Breakthrough in Polysilicon Technology
This breakthrough lays a solid foundation for the commercial development of flexible silicon-based tandem cells in lightweight/flexible high-power photovoltaic applications such as space photovoltaics and vehicle -integrated photovoltaics. On November 10, 2025, Nature online published significant progress in silicon-based tandem solar cell research by a team jointly formed by LONGi, Soochow University, Xi'an Jiaotong University, and other institutions. Today, crystalline silicon (c-Si) PV technology dominates the global PV market, with a share of about 95%. C-Si solar cells are characterized by high power conversion efficiencies (PCE) of more than. The latest technology insight report from the EPO's Observatory on Patents and Technology reveals that innovation in photovoltaics has experienced significant growth over the last three decades. However, to meet global climate change goals, renew bles must expand by at least three-fold within the next three decades.
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