Tunnels/Vertical Shafts

The damage was extensive after a fire hit the surface of a cable shaft at a 5,428 MW hydroelectric facility. The fire damaged the 245 kV power cables connecting the underground transformers to transformers on the surface. Two of the 11 generating units at the facility became inoperable. At the request of the owner of the facility, EHV Power’s personnel flew to the facility on the evening of the fire to assess the damage. RGP (Residual Gas Pressure) analysis on the spare LPOF (Low Pressure Oil Filled) cable reels commenced the next day. A day-by-day project schedule was prepared to remove the damaged cables from the shaft. Installation of new cables began immediately after the removal. One of the two disabled generators returned to service just two and half months after the fire.