Project Background & Challenges
Mission-Critical Objective: Construct a 220/35kV primary substation for PDG Data Center (48MW total capacity) in Kuala Lumpur, compliant with ANSI/TIA-942-B Tier IV – the highest reliability standard requiring ≤0.4 hours (24 minutes) of annual unplanned downtime (equivalent to ≥99.999% operational availability).
Extreme Environmental Conditions:
Tropical Climate: Persistent high heat/humidity (avg. 28–35°C, >90% RH), demanding exceptional equipment cooling, insulation integrity, and condensation resistance.
Grid Harmonic Distortion: Elevated harmonic pollution (THDu >8%) risking equipment overheating, protection misoperation, and measurement inaccuracies.
Coastal Corrosion: Site proximity <5 km from coastline exposed critical assets to salt fog-induced corrosion.
Core Requirement: Medium-voltage (MV) switchgear must deliver flawless performance in these harsh conditions – demanding supreme electrical stability, mechanical endurance, environmental resilience, and minimal maintenance to meet Tier IV’s zero-tolerance for failure.
Solution: SH-40.5V/T630A-25KA SF6 Ring Main Unit with Integrated Circuit Breaker (RMU-CB)
Deployed Technology: Our SH-40.5V/T630A-25KA SF6 Gas-Insulated Ring Main Unit with Circuit Breaker functionality served as the core MV switchgear for the 35kV distribution system.
Key Features Addressing Challenges:
SF6 Gas Insulation:
Environmental Immunity: Hermetically sealed design eliminates humidity, salt fog, and dust ingress, ensuring internal components operate in a pristine, dry SF6 environment.
Space Efficiency & Safety: Compact footprint conserves critical space; fully enclosed structure enhances personnel safety.
Dielectric Strength: Superior insulation properties guarantee long-term reliability at 35kV voltage levels.
Integrated Circuit Breaker (CB) Protection: Delivers full short-circuit interruption capability (25kA) – a foundational Tier IV requirement – unlike basic load-switching solutions:
Critical Fault Clearing: Reliably isolates worst-case short-circuit faults (25kA prospective current), protecting upstream grid infrastructure and downstream transformers.
Selective Coordination: Enables precise time-current grading with upstream (220kV) and downstream (e.g., transformer) protection to minimize outage impact.
Robust Electrical Ratings: 40.5kV voltage class (35kV system compatible), 630A continuous current, and 25kA breaking capacity meet high-density data center loads and grid fault levels.
Harmonic Resilience: Critical components (CTs, relays) designed for immunity to harmonic distortion (>8% THDu), ensuring measurement accuracy and protection reliability.
Maintenance Optimization: SF6 sealing and robust mechanical design extend service intervals, reducing downtime exposure from maintenance – essential for Tier IV operational continuity.
Product
Model/Specs
Technology Highlights
Application Scenario
SF6 RMU-Circuit Breaker
SH-40.5V/T630A-25KA
・Full breaking capacity 25kA (40.5kV insulation), response ≤60ms
・IP67 sealed chamber (SF6 gas insulation), 100% humidity tolerance
・C5 anti-corrosion (200μm epoxy Zn-Ni), salt fog >6000h
・Integrated harmonic suppression (THDu≤3%)35kV busbar protection & fault isolation
Interlock System
SafeLock-D4
・Enhanced “five preventions” logic (error blocking ≤15ms)
・IEC 61850 GOOSE communication with protection relaysIsolator operation safety
Condition Monitor
CM-1000i
・Real-time SF6 density/dew point monitoring (±0.5% accuracy)
・AI-based contact temperature warning (±2℃)
・Local HMI + cloud diagnosticsPredictive maintenance
