Research on Volume Monitoring Method of Concentrated Gas in Gas Relays for Transformers

As the most important non electric protection device for transformers, gas relays play a crucial role in ensuring the safe and stable operation of transformers. With the increase of operating years, the number of defects and abnormal problems in transformers is gradually increasing. However, it is difficult to obtain the true volume of gas accumulation during light gas alarms, making it difficult to determine whether there is a false alarm. It is necessary to quickly organize substation operation and inspection personnel to carry out on-site inspections of gas volume accumulation in gas relays, analysis and testing of dissolved gases in oil, and other work. This article addresses the above issues by using a capacitive liquid level sensor to achieve detection of liquid level height with a maximum deviation of less than 0.3%. A gas volume calculation model was established based on the dense point calibration method, and on-site actual light gas volume monitoring with a maximum deviation of less than 4<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> was successfully completed. The relevant achievements of this article have solved the problem of not being able to determine whether there is a false alarm during the light gas action of oil immersed transformers, and can provide data support for operation and maintenance personnel to grasp the real operating status of the equipment and formulate targeted operation and maintenance strategies.