31.5 MVA 110kV Semi-Trailer Mounted Mobile Substation for Emergency Utility Grid Restoration
Rapid-deployment 31.5 MVA 110kV mobile substation trailer with integrated SF6 GIS switchgear, OLTC power transformer, and digital protection relay system for instant emergency power restoration.
1. Project Context & Operational Challenge
Regional utilities face prolonged blackout risks during storm damage, transformer maintenance overhauls, or sudden feeder overloads. Standard stationary substations require 6 to 12 months to construct, leaving critical loads vulnerable during emergency outages.
2. Customized Engineering Solution
XinHuan engineered a complete 31.5 MVA 110kV/13.8kV mobile substation mounted on a multi-axle heavy-duty semi-trailer. The system integrates a compact 110kV SF6 Gas Insulated Switchgear (GIS), an On-Load Tap Changing (OLTC) power transformer, 13.8kV metal-clad output switchgear, and digital micro-processor protection relays.
3. Installed Equipment Parameters & Ratings
| Parameter Specification | Design Rating & Certified Value |
|---|---|
| Substation Capacity | 31.5 MVA (31,500 kVA) |
| High Voltage Rating | 110 kV |
| Low Voltage Rating | 13.8 kV / 11 kV |
| HV Switchgear | SF6 GIS (Gas Insulated Switchgear) |
| Transformer Cooling | ONAN / ONAF Dual Speed Fans |
| Tap Changer | Vacuum On-Load Tap Changer (OLTC) |
| Transport Platform | Multi-Axle Heavy Semi-Trailer Skid |
| Inspection Certification | 100% CNAS Factory Acceptance Tested |
4. Project Outcomes & Field Performance
The mobile substation reduced emergency outage downtime from 72 hours to under 4 hours, enabling utility engineers to perform planned substation overhauls without interrupting customer power.
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