△ Normal use environment conditions
The maximum ambient air temperature shall not exceed 40℃, and the average value measured within 24h shall not exceed 35℃, and the minimum shall not be lower than -25℃: the altitude shall not exceed 1000m;
Relative humidity: the daily average value shall not exceed 95%, and the monthly average value shall not exceed 90%.
Water vapor pressure: the daily average value shall not exceed 2.2kPa, and the monthly average value shall not exceed 1.8kPa.
The surrounding air is not obviously polluted by dust, smoke, corrosive and/or flammable gases, steam or salt spray.
The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6kv.
△ Special use conditions
①When the ring network cabinet is installed in an area with an altitude higher than 1000m, the ordering party shall negotiate the factory conditions with the manufacturer and request relevant test reports;
②) When the maximum ambient temperature exceeds 40℃℃, the rated current carrying capacity of the ring network cabinet must be reconfirmed by the manufacturer when ordering.
△ Scope of use
HEI-12 type ring main unit is used for segmentation, connection and load tapping of cable lines and cable-to-overhead lines in 12kV power systems.