Power distribution substation

compact

The CG Power Systems MiniSub is an evolution and development of the MicroSub design intended to replace the ESI type Minisub with a more cost effective and compact system. Using a similar arrangement to the USA type padmount transformer, the CG MiniSub range is fitted with HV Bay-O-Net™, withdrawable HV fuses in combination with HRC backup fuses in-tank as standard and a 3-way 3-phase outgoing fuse distribution unit. Alternative LV systems include LV circuit breakers or fuse switch units. HV termination can be by plug-in bushings or by conventional dry type cable box. The original ESI type Minisub used an oil fuse switch for HV switching and protection. While HV switching has obvious advantages, the fact is that in many applications the switching facility is rarely used, during the lifetime of the unit. The CG MiniSub keeps the cost and size down by not having these rarely used HV switching facilities. HV isolation can be achieved by withdrawing the HV fuses while the unit is de-energised. Temporary generation can be connected via the LV distribution unit.