Electricity + Control August 2019

round up TRANSFORMERS + SUBSTATIONS

Sierra Leone contract for local panel builder

been supplied to sites around the globe. JB Switchgear is an ISO 9001-listed, Level 3 BEE company. Enquiries: JB Switchgear.Tel +27 (0)11 027 5804, or email: info@jbswitchgear.co.za

JB Switchgear Solutions has been awarded a contract by DRA Global for the design and manufacture of numerous containerised substations mounted on skids and destined for a rutile mine in Sierra Leone. What makes the project unique is the fact that each of the containerised substations contains an MV/LV dry-type transformer and the required LV panels, which include motor control centres, distribution boards and programmable logic controllers as well as power factor correction, uninterruptible power supply and fire suppression systems. The containers are constructed with a mid- point split between the transformer and switchgear assemblies and the completed substations are mounted onto heavy-duty skids so they can be moved around the mine site. The substations cover three main areas on the site: the booster substations, mining in-pit substation and scrubber substation. Operational voltage in this instance is 480 V/60 Hƶ with a 50 kA fault level. Incomer sizes vary from 1 250 A to 2 500 A, and variable speed drives up to 350 kW. Connections between the transformer and LV switchgear are with resin-encapsulated busbars. JB Switchgear supplied its Eagle series panels which are IEC 61439 certified. More than 30 000 tiers of this design have

Eagle series panels and variable speed drives formed part of the contract for the containerised substations.

Electricity + Control

AUGUST 2019

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