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].

Core Viewpoint - The State Grid Tianjin Electric Power Research Institute has conducted the first domestic extreme low-temperature testing of high-voltage cable terminals, which will provide crucial data support for winter operation and maintenance of high-voltage cable equipment [1][3]. Group 1: Testing and Research - The testing involves a stepwise cooling process from room temperature to extreme cold, focusing on the insulation characteristics of 220 kV high-voltage cable terminals [1][3]. - The research team has built a temperature-controlled laboratory over two years to study the operational mechanisms of high-voltage cables under extreme weather conditions [3]. - Sensors for temperature and pressure have been installed inside the cable terminals to ensure the accuracy of the test data [3]. Group 2: Testing Conditions and Data Collection - The tests will be conducted at three low-temperature points: -5°C, -15°C, and -25°C, with steady-state data collected under high load conditions [3]. - The expected duration for data collection at the three temperature points is 80 hours, with a total testing period of two months [3]. - The core objective is to establish a correlation model between environmental temperature and terminal interface pressure, assessing discharge risks under different low temperatures [3]. Group 3: Future Research Directions - Future studies will include the impact of insulation blankets on the insulation characteristics of high-voltage GIS terminals [4]. - The laboratory serves not only for cable terminal research but also as a reliability verification platform for various types of power grid equipment under extreme conditions [4].