一种提高开关设备绝缘气体SF6泄漏判定鲁棒性的方法OA

SF6 gas is widely used in high voltage apparatus due to its excellent insulation and arc extinguishing properties.During the long-term operation of the equipment,the leakage of SF6 gas is inevitable,which may affect the safe operation of the equipment.At present,SF6 gas density relays are mostly designed using a soft measurement model,the SF6 gas density is obtained by measuring the temperature and pressure of SF6 gas inside the gas compart-ment and also with help of specific model.However,the parameter drift of pressure sensor in long-term usage of the process is inevitable due to aging,resulting in excessive error of the the measured gas pressure and further affecting the accuracy of this type of soft measurement method as well as occurring the phenomenon of misjudgment or omis-sion.In this paper,based on the in-depth analysis of the commonly used Beattie-Bridgeman model,a more robust SF6 gas leakage state detection method is proposed by applying linear regression and the introduction of slope and regression indexes,its principle and key points of technical implementation are introduced,and the simulation ex-periments are designed to verify the performance of the method.The results show that the method is less affected by the accuracy of the sensor and more sensitive to gas leakage over the traditional method.The method provides a new idea for the development of high-performance SF6 gas density relay and has a high practical application value.