SF6气体密度继电器在极端温度下的性能校验

SF₆气体密度继电器用于监测SF₆气体绝缘电气设备中SF₆气体密度的变化,其性能直接影响电气设备的安全运行。工程中发现,在极端气候条件下SF₆气体密度继电器的温度补偿性能会变差,出现较大误差,因此,SF₆气体密度继电器在极端温度下的性能检验非常必要。介绍一套可在极端温度下对SF₆气体密度继电器进行校验的装置以及针对华北地区的低温校验方法;在试验的基础上提出,在低温情况下应优先选用双金属补偿型密度继电器,而不选用标准腔补偿型密度继电器。通过极端温度时的性能校验,确保SF₆气体密度继电器动作的可靠性和准确性,保证电网安全运行。

Calibration of SF6 Gas Density Relays in Extremely Unusual Temperature Conditions

SF₆ gas density relays are used to monitor gas density changes in SF₆ insulated equipment, whose performances have a direct influence on the safety and reliability of the equipment. Data from fields shows that the temperature compensation performances of SF₆ density relays will become worse in extremely unusual weather conditions, which will lead to greater errors. Therefore, it is necessary for SF₆ gas density relays to be calibrated in those weather conditions. A kind of calibration devices for SF₆ density relays in extremely unusual weather conditions and a set of calibration methods especially applied to North China areas with very low temperature were introduced. Test results suggest that a density relay with dual metal compensation is preferable than a standard cavity compensation relay in an extremely low temperature condition. By the performance calibrations, the action reliability and accuracy of a SF₆ density relay can be ensured, which can prevent some kinds of power grid accidents from happening.