人妻少妇网站,AV日韩高清无码,久9999久视频,日本一区二区操逼,伊人操插久久伊人无码,嫩模精品在线,香蕉网草逼视频,青青草15在线视频,97人超碰

The 27.5kV box house (partition house, AT house, opening and closing house) is an important facility and equipment of traction power supply system; it integrates high-voltage electrical equipment, comprehensive automation system, AC/DC power supply system, auxiliary monitoring system, etc. in a closed metal box through system integration and primary and secondary fusion technology; it adopts factory design and pre-assembled production, featuring compact structure, small footprint, excellent performance, reliable operation and low cost; it is widely used in 27.5kV new construction and reconstruction projects. The 27.5kV box house product series include partition house, AT house, opening and closing house and switching station, etc.; high voltage equipment types are divided into air insulated type (AIS) and gas insulated type (GIS); applicable scenarios include high speed railway, passenger special railway, heavy load and general speed railway.