Drop in system frequency triggered grid collapse, says TCN

The Transmission Company of Nigeria (TCN) on Thursday, blamed the grid collapse experienced on Wednesday on a sudden drop in system frequency to 47.21Hz.

This was even as it announced that the grid was restored over four hours after it collapsed.

The Company in a statement issued and signed by its Spokesperson, Mrs Ndidi Mbah explained that reports from SCADA and other power generating stations showed that at about 12:20 pm, two generating units tripped in one generating station while four equally tripped in another generating station, causing a loss of 261MW and 350MW respectively.

It said this had put the total loss of electricity on the grid to 611MW.

“The Transmission Company of Nigeria hereby states that the nation’s grid was fully restored at 4:59 pm yesterday, 28th July 2021, after a grid collapse which occurred at about 12:20 pm the same day, the collapse was triggered by a sudden drop in system frequency to 47.21Hz.

“It is suspected that the sudden loss of 611MW from the grid, caused system instability and its eventual collapse,” the statement read.

It disclosed that: “its system operators commenced the restoration of the grid and by 12:46 pm, power supply in Abuja was fully restored from Shiroro Generating Station.

“At 1:05 pm, TCN equally commenced grid restoration from the Delta Power Station, and at 4:59 pm, a full restoration of the entire grid was achieved.”

However, it stressed that it would continue to work hard to expand and maintain the stability of the national grid.

Section 10.1 of the Nigerian Grid Code on frequency and voltage puts the standard at 49.75Hz and 50.25Hz.

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