What enclosure options are available for outdoor installed RMU?

The air filtration device consists of a housing, filter materials and other components. When a pressure difference occurs between the inside and outside of the sealed enclosure, air exchange takes place through this device. Meanwhile, it can effectively block dust, salt spray and other solid particulates from entering the sealed enclosure.

Available tripping coil options include conventional tripping coils, low power tripping coils (for self powered protection relays), and under voltage trip coils. Only conventional closing coils are available. For the manual charge operating mechanism, up to two tripping coils can be fitted. Closing coils are normally not supplied, though one closing coil may be optionally fitted. For the electric charge operating mechanism, two tripping coils and one closing coil can be selected.

Excluding the secondary top compartment, the minimum height of the 24 kV switchgear is 1700 mm. This height imposes considerable constraints on the installation of CTs and busbar PTs. It is recommended to select 1 A for the CT secondary current. Please consult us for detailed accuracy class and burden parameters. If busbar PTs are adopted, please consult us on the installation arrangement.

Pressure relief vents are fitted as standard across all cabinet types. The IAC internal arc classification is AFLR 20 kA/1 s, 25 kA/1 s and 31.5 kA/0.5 s.

This product is widely used across sectors including power, energy, scientific research, aerospace, municipal utilities, transportation, commercial & residential buildings, as well as industrial and mining sites. It has decades of field operation experience under various extreme environmental conditions, such as heavy sand dust conditions, high salt spray, high temperature and high humidity.

The cable bushings are designed according to EN 50181 Type C. Matching European type separable cable accessories shall be adopted.