The Transmission Company of Nigeria (TCN) has stated that the body has restored the national power grid after it experienced partial system disturbance at about 1:06 p.m. yesterday which it claimed followed a sudden drop in system frequency from 50.18Hz to 47.63Hz that caused system instability and consequently the national grid partial collapse.
The power management body explained that the partial system disturbance did not affect parts of the grid such as Afam Complex, Alaoji, Ikot Ekpene, Odukpani, and Calabar axis.
The TCN’s General Manager, Public Affairs, Ndidi Mbah, announced the development through a statement in Abuja on Tuesday, adding that electricity supply to Afam Complex, Alaoji, Ikot Ekpene, Odukpani, and Calabar axis was not interrupted by the incident.
“According to reports from the Supervisory Control and Data Acquisition (SCADA) readings and some substations, control panel readings by System Operators showed that some units from a particular generating station tripped suddenly.”
The general manager said that the tripping caused an initial loss of 402 megawatts (MW) of electricity from the grid network. “This caused a destabilising imbalance which further caused the pulling out a total of 3,560MW from the grid that finally collapsed part of the national grid,‘’ she stated.
Mbah said that TCN commenced the immediate recovery of the grid at 1:19 p.m. through Shiroro Generating Station and almost immediately restored electricity to Abuja axis.
She said that the Alaoji–Onitsha axis was restored at about the same time as Abuja, while the Shiroro-Mando axis, on the other hand, was restored by 3:42p.m. According to her, by 6.57 p.m. on Monday, the national grid was fully recovered and operational.
“TCN appreciates the kind understanding of government and electricity consumers within the affected areas as it is consistently executing projects geared towards putting in place a very robust grid. It is equally pursuing a nationwide SCADA implementation that would further contribute to grid stability,‘’ she added.