国网天津电力开展极端低温高压电缆终端绝缘特性试验

Core Viewpoint - The article discusses a groundbreaking experiment conducted by the State Grid Tianjin Electric Power Research Institute to test the insulation characteristics of high-voltage cable terminals under extreme low temperatures, addressing the challenges posed by frequent extreme weather events in North China [1][2]. Group 1: Experiment Overview - The experiment involves subjecting 220 kV high-voltage cable terminals to a controlled temperature drop to -25 degrees Celsius, aiming to understand how these cables can withstand low-temperature impacts [1]. - This is the first domestic experiment of its kind, establishing a model to correlate environmental temperature with terminal interface pressure, which is crucial for assessing discharge risks under varying temperature conditions [1][2]. Group 2: Methodology and Data Collection - To ensure data reliability, temperature and pressure sensors were installed inside the cable terminals, and the experiment simulates real operating conditions with high load currents maintained [2]. - Data will be collected at three low-temperature points (-5, -15, and -25 degrees Celsius) over approximately 80 hours, allowing for a comprehensive analysis of temperature-pressure relationships under both high and low load conditions [2]. Group 3: Research Implications - The overall experiment will last for two months and aims to provide a scientific basis for operational strategies of high-voltage cables during winter [2]. - Future research will also explore the impact of insulation blankets on the insulation characteristics of high-voltage GIS terminals, expanding the laboratory's role in testing various electrical equipment under extreme conditions [2].