21st July, 2022
By Constance Athekame
The Transmission Company of Nigeria (TCN) on Thursday said restoration of the national grid was almost completed following its collapse on Wednesday.
Mrs Ndidi Mbah, TCN General Manager, Public Affairs, said this in a statement made available to newsmen in Abuja.
She explained that the national grid experienced system disturbance at about 11:27 a.m. on Wednesday, but that its restoration was almost completed as of 11:00 p.m.
“The incident was a result of a sudden drop in system frequency from 49.94 Hertz (HZ) to 47.36Hz, which created system instability,” she said.
Mbah said that reports from the National Control Centre (NCC), revealed that the collapse was precipitated by the tripping of a unit with a load of 106 Megawatts (MW) in one of the generating stations due to “Exhaust over Temperature”
According to her, the tripping pulled out other grid-connected units in the plant, which resulted in an aggregated generation loss of 457MW.
“A train of events ensued, culminating in the collapse of the national grid. As obtainable in all systems, when a component of the electric power system is defective, the entire configuration is vitiated,” she said
An investigation was going on to establish the cause of the failure.