Zest WEG delivers its biggest mobile substation
South Africa: Zest WEG has recently custom designed and manufactured one of the largest mobile substations ever built in South Africa.
Image source: Zest WEG
South Africa: Zest WEG has recently custom designed and manufactured one of the largest mobile substations ever built in South Africa.
The 50 MVA mobile substation – destined for Guinea – includes a dual voltage rated mobile transformer produced by WEG in Brazil, according to Bernard Mitton, engineering team leader for integrated solutions at Zest WEG. The substation will be commissioned early in 2022.
“This is a full turnkey project procured by Robustrade in Dubai for the utility company of Guinea, called Electricité De Guinée,” says Mitton. “Our in-house team co-ordinated the electrical, civil and mechanical designs, as well as the engineering solutions for the customer.”
The full project includes three trailers of equipment, and allows the end-user to step down power from the main national grid at various geographic points as required. High voltage power is tapped from existing overhead line with a specifically designed and manufactured tee-off solution connecting the supply into the mobile substation, where it is stepped down from 110 kV or 60 kV to 20 kV or 30 kV depending on requirements.
As part of the project, Zest WEG designed and supplied a cable reel trailer with all power and control cabling needed for the mobile transformer and mobile switching station. Included on this trailer are 30 kV field junction boxes to assist with the cable connection between exiting cables already installed and the supply cables from the mobile switching station. These boxes allow for up to three feeder cable connections. The advantage of this design, he notes, is that the junction box becomes a termination point. The termination ends of the on-site cable do not need to be redone, and all that is necessary is a bolt-on connection.
The mobile substation includes innovative design features such as the integration of several functions into a compact, modular design. New technologies such as hybrid circuit breakers have been employed, along with disconnectors, earthing switches, ring-type current transformers, inductive voltage transformers and surge arresters.
Source: Zest WEG
#Electricité De Guinée#mobile substation#South Africa#zest WEG