Packing : ptfe or graphite packing protected from freezing by a column of insulating gas 填料：通过绝缘气体柱防止ptfe或石墨填料冻结凝固。
2.
Test methods for water vapor content of electrical insulating gases by measurement of dew point 用露点法测定电绝缘气体中水蒸汽含量的试验方法
3.
Packing : teflon or graphite packing protected from low temperatures by a column of insulating gas 填料：通过保温绝缘气体来保护聚四氟乙烯或石墨免受低温影响。
4.
Standard test method for dielectric breakdown voltage and dielectric strength of insulating gases at commercial power frequencies 在工业用电频率时绝缘气体介电击穿电压和介电强度的标准测试方法
