SF_6气体密度继电器在极端温度下的性能校验

Calibration of SF_6 Gas Density Relays in Extremely Unusual Temperature Conditions

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。

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.