Gansu–Zhejiang UHV project completes heavy-load transport of converter transformers at Yuezhou station

The last high-end converter transformer of the Gansu-Zhejiang Ultra-high Voltage (UHV) project arrived at the Yuezhou Converter Station on Sept 3, marking the successful completion of heavy-load transport for all 14 units. This milestone paves the way for subsequent installation, commissioning, and the project's scheduled energization.

As the core equipment linking direct current and alternating current systems, converter transformers are vital to UHV stations.

The largest single unit here has a rated capacity of 750 MVA and weighs 445 metric tons, making its transport an ultra-challenging operation.

To drive the mission forward, Zhejiang Power Transmission & Transformation Company conducted a full route survey six months in advance, assessing road conditions, bridges, and traffic limits, and formulating a scientific overland plan.

State Grid Shaoxing Power Supply Company coordinated with local authorities and construction partners to select a temporary transshipment platform and run simulation drills. They raised or modified over 220 road signs, traffic signals, and overhead lines, reinforced bridges, widened curves, and uniformly lifted power and communication lines to over 7.3 meters.

Traffic police provided full-route escorts to create green safety corridors. The team scheduled operations to avoid the local bayberry harvest peak, while coping with persistent heat and multiple typhoons — achieving zero safety incidents, zero equipment damage, and zero schedule delays.

For positioning and installation, technical staff developed specialized procedures using pallet jacks for transverse movement and hydraulic jacks for leveling and alignment, combined with tow-vehicle traction and jacking into place.

A strict quality control regime — verifying each unit and inspecting each step — ensured all positioning met satisfaction and all equipment was ready for operation.

Currently, the Yuezhou station has entered peak electrical installation, with full commissioning slated for April 2027.