Project Overview
Project Type: Urban Distribution Network Upgrade & Rural Electrification Integrated Project
EPC Contractor: Electrical Construction & Projects Co.
Completion Date: Q4 2025 (In Progress)
Location: Huíla and Huambo Provinces, Angola
End User: Empresa Nacional de Distribuição de Electricidade (ENDE)
Project Objective: Enhance urban power supply reliability, expand rural grid coverage, and reduce line losses.
Technical Solution Overview
TSTYNICE, as the key equipment supplier, provides a complete transformer and compact substation solution for this project, covering both urban load center upgrades and first-time electrification needs for rural communities.
A) 15 kV Class Distribution Transformers
Model: PTA-AL-250-15/0.4
Specifications: Three-phase, 250 kVA, 15 kV / 400-230 V, aluminum windings
Quantity: 16 units
Features: Designed for capacity expansion of existing 15 kV networks, low-loss design, equipped with surge protection and anti-theft enclosure.
B) 30 kV Class Distribution Transformers
Model: PTA-AL-250-30/0.4
Specifications: Three-phase, 250 kVA, 30 kV / 400-230 V, aluminum windings
Quantity: 44 units
Features: Designed for long-distance rural feeders, reinforced insulation system, suitable for 30 kV grid expansion areas.
C) 30 kV Class Compact Substations
Model: PTCB-630-30/0.4-Mini
Specifications: 630 kVA, 30 kV incoming line, 400 V outgoing lines, mini-substation type
Quantity: 16 sets
Configuration:
30 kV SF6 RMU (2-incoming, 1-transformer feeder, 1-spare)
630 kVA oil-immersed transformer (30/0.4 kV)
LV distribution panel (with metering, outgoing circuit breakers, capacitor compensation)
Integrated crash-resistant steel enclosure (IP54 protection)
D) 15 kV Class Compact Substations
Model: PTCB-630-15/0.4-Mini
Specifications: 630 kVA, 15 kV incoming line, 400 V outgoing lines, mini-substation type
Quantity: 14 sets
Configuration:
15 kV SF6 RMU or load-break switchgear
630 kVA oil-immersed transformer (15/0.4 kV)
Integrated LV distribution and metering panel
Compact prefabricated base and enclosure
Core Design Features
Environmental Adaptability
Climate Protection: All equipment with C4-M corrosion protection rating, suitable for tropical savanna climate (high temperature, high humidity, strong UV).
Anti-Theft Design: Transformers equipped with welded anti-theft locks; substation enclosures use tamper-proof bolts and alarm sensors.
Animal Protection: Sealed cable entry/exit ports to prevent ingress of snakes, rodents, etc.
Technical Advantages
Low Losses: Transformers meet IE3 efficiency class, with no-load losses 25% lower than current Angolan standards.
Smart Features: Compact substations pre-equipped with DTU for remote monitoring of voltage, current, power factor, oil temperature, etc.
Modularity: Substations are 85% factory-assembled, reducing on-site installation time by 60%.
Local Compliance
Compliant with Angolan Technical Standards (Normas Técnicas Angolanas) and Portuguese language labeling requirements.
LV side configuration compatible with the locally common IT earthing system.
Provision of Portuguese installation manuals, training materials, and local spare parts lists.
Project Execution
Phased Delivery
Phase 1: 30 kV Transformers (44 units) & 15 kV Transformers (16 units) – Delivery in Q4 2024.
Phase 2: 30 kV Compact Substations (16 sets) – Delivery in Q4 2025.
Phase 3: 15 kV Compact Substations (14 sets) – Delivery in Q4 2025.
Local Collaboration
Joint site civil works guidance with Electrical Construction & Projects Co..
Batch-wise operation and maintenance training for ENDE technicians.
Establishment of a Luanda-based emergency spare parts depot to support post-project O&M.
Expected Outcomes
Urban Areas (using 630 kVA Substations)
Provide 16 new power supply nodes for 2 provincial urban load centers.
Expected reduction of unplanned outage time by 35%.
Power factor improved to above 0.95 through capacitor compensation.
Rural Areas (using 250 kVA Transformers)
Provide first-time grid connection for 60 rural communities.
Extend electricity coverage to over 15,000 households.
Voltage compliance rate at the end of 30 kV lines to increase from 70% to 92%.
Client Benefits
For the EPC Contractor Electrical Construction & Projects Co.:
Obtains a complete technical solution and one-stop equipment supply, simplifying procurement.
Modular equipment design significantly reduces on-site installation time.
Professional technical support enhances project delivery quality and client satisfaction.
For the End User ENDE:
Establishes a modern, layered distribution grid with well-matched capacities.
Intelligent equipment provides an interface for future distribution automation upgrades.
High-efficiency equipment can reduce lifecycle operational costs by approximately 20%.
