Caption: TSTYNICE compact RMUs and substation transformers enabling reliable power distribution and future capacity expansion for a leading university campus in Sri Lanka's Western Province.
Technical Specifications
Equipment: 8 units of 11kV Ring Main Units (RMU), 4 units of 1 MVA 3-phase oil-immersed distribution transformers.
Core Parameters:
RMU: 11kV rated voltage, SF6 insulation, 2-way ring + 1 transformer feeder configuration, integrated protection & metering.
Transformer: 11/0.433 kV voltage conversion, Dyn11 vector group, ONAN cooling, designed for 50Hz grid.
Shared Feature: Tropicalized design for high humidity and ambient temperatures.
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Key Features
Modular & Scalable Grid Design: The 11kV RMUs form a reliable ring network for the campus's primary distribution, ensuring N-1 contingency and allowing for easy future feeder expansion to new buildings.
High-Efficiency & Low Loss: Transformers feature Class I efficiency (IEC 60076) with 0.3mm grain-oriented silicon steel core, minimizing campus operational energy costs and thermal footprint in enclosed substations.
Tropical Climate Resilience: Full IP67 enclosure protection for RMUs; transformers with enhanced anti-corrosion treatment on tanks and radiators. All equipment designed for continuous operation in high humidity and temperatures up to 45°C.
Safe & Intelligent Operation: RMUs with visible earthing switch, fault indicators, and optional SCADA interface for remote monitoring. Transformers equipped with pressure relief device, thermometer, and Buchholz relay for comprehensive protection.
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Project Execution
Customized Integration: Pre-fabricated and pre-tested compact substation modules, including transformer and RMU, reduced on-site installation time by 50% and minimized disruption to campus activities.
Phased Deployment: Delivery and installation aligned with the university's multi-year campus infrastructure master plan, supporting the upgrade of the power network for existing faculties and new research centers.
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Operational Results
Grid Reliability: Implementation of an 11kV ring main system significantly improved power supply reliability to critical facilities (labs, libraries, data centers), eliminating long outage times from radial feeder faults.
Loss Reduction & Capacity: New high-efficiency transformers reduced no-load losses by approximately 25% compared to replaced units, while providing the necessary capacity headroom for future campus load growth.
Lifecycle Durability: Equipment designed for a 30+ year service life under tropical conditions, with minimal maintenance requirements for the sealed RMUs and reliable transformer design.
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Certifications & Standards
Compliant with IEC 62271-105 (for RMU), IEC 60076 (for Transformer), and Sri Lankan Sri Lanka Standards (SLS).
SF6 gas handling procedures in accordance with IEC 61634.
Delivered with English and Sinhala documentation, type test reports, and routine test certificates for each unit.
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Client Benefits
Enhanced Power Quality & Reliability: Provides a modern, robust electrical backbone crucial for uninterrupted academic and research operations.
Future-Proof Infrastructure: Modular RMU-based ring network design allows cost-effective capacity and feeder expansion alongside campus development.
Lower Total Cost of Ownership: High equipment efficiency reduces long-term energy costs, while compact design and pre-assembly saved significant space and civil works expenses.
