Relay protection transformers in Sierra Leone typically range from $200,000 for large power transformers to under $100 for small distribution units, depending on specifications and protection features.

Price Overview

• Large Power Transformers (10 MVA and above): Prices start around $200,000 and can reach several million dollars depending on MVA rating, voltage class, and cooling systems. These are custom-engineered units for substations and industrial applications, often including advanced protection relays .
• Distribution Transformers (15 kVA to 500 kVA): Smaller, pole-mounted or pad-mounted units range from $1,500 to $20,000, influenced by kVA size, primary voltage, copper windings, and tap changers .
• Local Supplier Pricing: Salis Sierra Leone Ltd lists smaller transformer units at $99, which may represent basic distribution transformers rather than high-end protection units .

Relay Protection Features

Transformer protection relays are essential for monitoring, control, and safeguarding transformers. They provide main protection for two-winding power transformers, generator-transformer blocks, and medium-voltage distribution systems. Common types include:

• SIU-C relays: Voltage and frequency protection for high, medium, and low-voltage systems .
• RGU-100A / RGU-10A: Ultraimmunized earth leakage protection and monitoring relays compatible with specific transformer ranges .
• DER3B / DER4B: Differential toroid relays for tertiary sector applications, offering precise protection for alternating current systems .

Obtaining a Quote in Sierra Leone

1. Contact Local Suppliers: Companies like Salis Sierra Leone Ltd can provide pricing for standard transformers and may assist with relay protection options .
2. International Manufacturers: ABB and other global brands offer transformer protection relays with detailed specifications. Direct inquiries can yield customized quotes based on voltage, MVA, and protection requirements .
3. Market Reports: The Sierra Leone Protective Relays Market report provides insights into emerging trends, demand, and potential suppliers, which can help in negotiating prices and identifying high-growth opportunities .

Recommendation

For a precise price quote, it is best to provide the supplier with:

• Transformer MVA rating and voltage class
• Required protection relay type and features
• Cooling system preferences (oil, air, or hybrid)
• Delivery and installation requirements This ensures the quote reflects the specific technical and operational needs for Sierra Leone's power infrastructure.