Parameters for upgrading electrical distribution boxes in South Sudan

Upgrading electrical distribution boxes in South Sudan requires attention to substation capacity, transformer ratings, feeder lines, and associated equipment to ensure reliable power delivery and accommodate future demand.

Key Technical Parameters

1. Substation Capacity

• Recommended substations for Juba include 33/11 kV substations with a capacity of 2x10/14 MVA each to handle current and projected loads .
• Substations should be equipped with modern switchgear, protection relays, and monitoring systems to improve reliability and safety. 2. Distribution Transformers
• Transformers should match the substation voltage levels, typically 33/0.415 kV, and be sized according to the expected load per feeder .
• Installation of 195 transformer stations has been planned for Juba to support both existing and new customers .
• Transformers should include capacitor banks to improve power factor and reduce losses. 3. Feeder Lines and Cabling
• High-voltage feeder lines: 33 kV lines spanning approximately 145 km for primary distribution .
• Low-voltage distribution lines: 415/230 V lines totaling around 370 km, including drop lines for new connections .
• Service cables should be sized to handle peak loads and minimize voltage drops. 4. Meters and Customer Connections
• Deployment of prepaid meters for new customers (e.g., 20,000 units in Juba) ensures accurate billing and reduces losses .
• Distribution boxes should be compatible with these meters and allow for easy maintenance and monitoring. 5. Equipment Replacement and Maintenance
• Immediate replacement of faulty equipment in existing distribution boxes is critical to prevent outages .
• Operation and maintenance contracts should be established, including training for SSEC and Ministry staff on system administration and safety procedures . 6. Safety and Standards
• All distribution boxes and associated equipment should comply with IEC standards for electrical safety, insulation, and grounding.
• Proper labeling, surge protection, and weatherproofing are essential in South Sudan's climate. 7. Capacity Planning
• Upgrades should consider suppressed demand and future growth, ensuring that distribution boxes and transformers can handle increased load without frequent overloading .
• Integration with planned generation sources, such as the Fula Rapids 40 MW hydropower plant, should be factored into design .

Summary

Upgrading electrical distribution boxes in South Sudan involves a holistic approach: installing appropriately rated substations and transformers, deploying high- and low-voltage feeder lines, integrating prepaid meters, replacing faulty equipment, and ensuring proper maintenance and staff training. These measures will enhance reliability, reduce losses, and support the expansion of electricity access in urban centers like Juba .