MOBILE SOLUTIONS. COENRAAD VREY (M.ENG., PR.ENG.) Managing Director Zest Energy (Pty) Ltd South Africa

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1 MOBILE SOLUTIONS COENRAAD VREY (M.ENG., PR.ENG.) Managing Director Zest Energy (Pty) Ltd South Africa

2 OVERVIEW OF TRANSMISSION AND DISTRIBUTION NETWORK

3 THE NEED FOR A MOBILE SOLUTION

4 THE NEED FOR A MOBILE SOLUTION Emergency power supply (Reduction in response time to emergency/maintenance) No civil work, no dismantling and reassembling Easy connection to other electrical infrastructure Maximum mobility and flexibility Promote electrical network availability and the reduction in network downtime, commonly associated with maintenance activities or unexpected fault conditions Avoid the risk of making large investments in substations and other power sources where the site requiring power has a short or temporarily life time Integrated compact solution to fit on sites with space constraints Increased and spare capacity readily available when and where needed Reduce capital expenditure commonly associated with fixed or permanent power sources

5 TYPES OF MOBILE SOLUTION Key Attributes: Mobile Power Generator Containerised generator with all auxiliary systems, custom built sound attenuated enclosure and power generation capacity of 2.5MWe Compact integrated solution No Earthworks (Foundation) and Civil Works Weight and Dimensional limitations Low logistics costs Limited Upgradability Customised design High mobility Key Components: Prime Movers c/w Cooling system and Exhaust chimney Alternators MV-LV room equipped with MV and LV Switchgear and Protection and Control system MV Room equipped with Export Circuit Breaker and Trailing Cables Synchronisation onboard

6 TYPES OF MOBILE SOLUTION Key Attributes: Compact integrated solution Minimal Earthworks (foundation) and Civil Works Dimensional limitations Moderate logistical costs Limited Upgradability Limited mobility Containerised Distribution Switching Substation Containerised switching substation provides lower cost and movable solutions for indoor MV and LV Distribution Switchgear, Protection and control equipment.

7 TYPES OF MOBILE SOLUTION Key Attributes: Compact integrated solution No Earthworks (Foundation) and Civil Works Dimensional limitations Low logistics costs Limited Upgradability Customised design High mobility Mobile Distribution Switching Substation Up to 33kV, 5000A systems are manufacturable. Key Components: GIS MV Switchgear equipped with arc duct chimney and bottom cable entry Sliding door and collapsible stair way Complete switch room with a control mimic display

8 TYPES OF MOBILE SOLUTION Key Attributes: Compact integrated solution No Earthworks (Foundation) and Civil Works Dimensional limitations Easily interconnected Limited Upgradability Limited mobility Skid-based Substation A complete Electrical substation mounted on a skid-base for mobility. Special adapted solution for mining application.

9 TYPES OF MOBILE SOLUTIONS Key Attributes: Compact integrated solution No Earthworks (Foundation) and Civil Works Weight and Dimensional limitations Low logistics costs Limited Upgradability Customised design High mobility High flexibility (Multi-ratio voltage selection) Mobile Substation A complete Electrical substation mounted on one semi-trailers. The mobile substation consists of a compact line bay and transformer bay, with a full onboard protection schemes.

10 OVERVIEW OF MOBILE SUBSTATIONS Mobile Distribution Substation Up to 65MVA, 245kV systems are manufacturable. Key Components: Series Graded Surge Arresters HV Compact Circuit Breaker c/w built in CT s and 3- position Disconnector switch IP55 Kiosk for housing of the protection panel and AC/DC system, SCADA System/Remote Operation Multi-ratio Power Transformer c/w Expansion Tank and accessories Cooling System Pneumatic telescopic mast Multi-ratio NECRT MV 3-position Disconnector switch c/w Earthswitch (to earth the Tx side) MV Circuit Breaker MV 3-position Disconnector switch c/w Earthswitch (to earth the cable side) Trailing Cable support structure c/w MV Surge arresters SCADA System/Remote Operation

11 OVERVIEW OF MOBILE SUBSTATIONS Power transformer Reduced dimensions and weight Hybrid or Nomex Insulation ODAF Cooling system (Increase capacity by ±60%, compared to ONAN) Trailing Cables on reels Use of cables designed with high flexibility (EPR Trailing Cables) Rated voltage and Current carrying capacity up to 33kV, 1250A per single core Special designed cable reels (Motorised or manual operated) Each reel has capacity to fit up to 100m, 630mm 2 Single core cable

12 OVERVIEW OF LEGISLATIVE REQUIREMENTS Republic of South Africa Department of Transport

13 REFERENCE PROJECTS HARMONY MOBILE GENERATORS 4 off 2.5MW, 6.6kV MOBILE DIESEL GENERATORS NORMAL ROAD GOING DESIGN (NOT ABNORMAL) 4 OFF 4500L FUEL TRAILERS 8 HOUR FUEL STORAGE CAPACITY (FULL LOAD) SHAFT ELECTRICAL INTEGRATION SOLUTION 13 UNIQUE / INDIVIDUAL MINE SHAFTS 13

14 REFERENCE PROJECTS SWAKOP URANIUM (HUSAB JV) PIT TRANSFORMERS 4 off 5MVA, 33/6.6KV, SKID MOUNT SUBSTATIONS ROBUST SKID BASE - CUSTOM ENGINEERED AND BUILT SUBSTATION ENCLOSURE, INTEGRATED WITH BASE (MAXIMUM RIGIDITY) SUBSTATION COOLING AND FIRE PROTECTION SYSTEMS SITE COMMISSIONING SERVICES DESIGNED TO FACILITATE MOBILITY AND RUGGARD TERRAIN 14

15 REFERENCE PROJECTS ESKOM SWITCHING SUBSTATIONS PROJECT SCOPE 6 off 11/22kV Mobile substations 2 X 1250A GIS INCOMERS 1 X 1250A GIS BUS-SECTION 7 X 800A GIS FEEDERS 1 X 1250A GIS FEEDER MICOM PROTECTION PANELS AC/DC DISTRIBUTION PANELS BTU REMOTE CONTROL SWITCHING AIR-CONDITIONED UNITS PNEUMATIC TELESCOPIC AREAL 15

16 REFERENCE PROJECTS ESKOM MOBILE SUBSTATIONS 2 OFF 40MVA 132/88//33/22kV 2 OFF 20MVA 132/88//22/11kV 1 OFF 10MVA 33/22//22/11kV TRANSFORMERS (WEG BRAZIL) HV / MV SWITCHGEAR (ABB) TRAILERS (LOCALLY) ASSEMBLY AND INSTALLATION (LOCALLY) 16

17 REFERENCE PROJECTS ESKOM MOBILE SUBSTATIONS 17

18 CONCLUSION Mobile power solutions are customised and engineered solutions to fit the required application. The power network is optimised through the use of mobile power equipment. Availability Maintainability Reliability Flexibility Capacity Mobile power solutions presents a potential sound investment with high capability to mitigate the power challenges face in Africa.

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20 THANK YOU