Background
As the core of the Philippines’ North-South Transport Corridor, the 12.4km Taburos Tunnel (longest in SEA) required a power network covering 36 worksites, 7 TBMs, and 23 emergency shelters. Critical challenges included:
Extreme Corrosion: 800m from coastline, salt fog >5mg/m³ (exceeding IEC 60721-3-4 CX class), reducing equipment lifespan to <5 years;
Dynamic Load Impact: TBM start/stop caused ±40% voltage fluctuations with severe harmonics (11th harmonic >12%);
Regulatory Conflicts: Compliance with Philippine PEC 3-2018 explosion-proof, IEC 62271 arc resistance, and Chinese GB 3906 thermal limits (17 design conflicts).
As sole medium-voltage integrator, SH Power delivered a full solution from 10kV intake to 0.4kV terminals, commissioning 156 units within 18-month typhoon window.
As a key equipment supplier for the project, SH Power provides the following products and services:
| Product Category | Model/Specs | Technology Highlights | Client Value |
|---|---|---|---|
| Main Incoming Cub. | Schneider NS1000NA 1000A | ・Anti-Corrosion: 304SS cabinet + nano-ceramic coating (15,000h salt spray) ・Vibration Isolation: Elastic busbar supports (5-80Hz blast proof) | Coastal tunnel adaptation |
| Feeder Cubicle | Schneider MT50 5000A MIC2.0A | ・ms Protection: MIC2.0A trip unit (short-circuit response ≤20ms) ・Harmonic Immunity: EMC design (fault rate <0.1% at 11th harmonic) | TBM surge protection |
| Step-Up Transf. | S11-3200/10 (0.4kV→10kV) | ・Hermetic Seal: Corrugated tank + N₂ pressure (100% RH operation) ・High Efficiency: Load loss 23.5kW (8% below IEC 60076) | 12.4km cable loss reduction |
| HV Switchgear | KYN28-12 630A/25kA | ・Multi-Standard: Passed IEC 62271 internal arc test + PEC 3-2018 explosion-proof ・Safety Interlock: Mechanical blocking (zero misoperation) | Multi-regulatory compliance |
