Aimed at phenomena of damp and dew occur in 10 kV high-voltage switchgear

which will lead to serious failures to its internal electric equipment

this paper discusses the key technologies and designs the research scheme. First

starting from mechanism of occurrence of damping and dewing in switchgear

three major categories of damp-proofing and anti-dewing technologies applied currently are summarized

including the heating dehumidification technology

condensing dehumidification technology

and dry-air dehumidification technology. Moreover

their merits and demerits are briefly analyzed. Then

based on the principle of dry-air dehumidification

which has the best performance among the three major approaches

the technique of anti-damping and anti-dewing for switchgear is investigated thoroughly

including dry-air source technology research and the corresponding device scheme design

as well as research on the technology of compulsory flow of the air in switchgear. Next

the scheme of the dry-air dehumidification based switchgear monitoring and control system is design. Finally

preventive measures for damp and dew occurred in switchgear are presented. In addition

its future development is prospected

and it is deemed that the dry-air dehumidification technology has a wide research space. This paper can provide some reference value and guide significance for the prevention and control of damp and dew phenomena in the 10 kV high-voltage switchgears in distribution networks.