On Sunday 22nd April 2018, at 3:30pm, all EFL customers in the Central Division of Viti Levu experienced a power disruption.
A mynah bird had bridged (created a short circuit connection) the high-voltage phase connections of one of the two 132,000/33,000 Volts transformers at Cunningham Road Substation, affecting the 132,000 Volts extra high-voltage transmission network.
The 132,000/33,000 Volts transformers at Cunningham Road Substation are part of the 132,000 Volts extra high-voltage transmission network, which spans the centre of Viti Levu inter-connecting the electricity networks in the Central and Eastern Regions to the Monasavu and Nadarivatu Hydro-Electric Schemes.
Power supply to the customers affected by the disruption at 3:30pm in the Central Division was normalized through the other 132,000/33,000 Volt transformer at Cunningham Road Substation, by 4:30pm, as EFL technicians and engineers isolated and inspected the faulted 132,000/33,000 Volts transformer at Cunningham Road Substation.
At 4:48pm, EFL engineers and technicians completed all inspections on the isolated 132,000/33,000 Volts transformer at Cunningham Road Substation and attempted to put it back into service. When this transformer was switched back on, mysteriously thereafter, both the 132,000/33,000 Volt transformers at Cunningham Road Substation went out of operation causing a power supply disruption to all customers in the Central and Western Divisions of Viti Levu.
By 6:25pm, EFL had restored power supply to all its customers in the Western and Central Divisions of Viti Levu, affected by the second power disruption at 4:48pm.
EFL is investigating the cause of the intermittent failure of both the 132,000/33,000 Volt transformers at the Cunningham Road Substation.