TCN’s ‘poor’ protection equipment to blame for system collapses – DisCos

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The umbrella body of 10 power Distribution Companies (DisCos) have blamed the Transmission Company of Nigeria (TCN)’s “poor transmission network protection” for the nine grid system collapses recorded so far this year.

Sunday Oduntan, the spokesman for the Association of Nigerian Electricity Distributors (ANED) on Wednesday, said the DisCos regretted the unfortunate accident that occurred on Sunday, 30th June, 2019, at the TCN substation in Benin City, leaving Nigeria in darkness for hours.

“The DisCos remain available to offer their technical assistance to TCN, to ensure that our valued customers do not remain in darkness,” ANED informed in a statement.

It said the failure of the TCN Benin Substation on Sunday was the second of such occurrence in the same city within a year. It reported the trend of burnt transmission stations and failed transmission substation incidents in Lagos, Calabar, Abuja, Enugu and Onitsha as at May 8, 2019, due to inadequate transmission protection mechanisms and procedures.

They also expressed displeasure over TCN’s practice of arbitrary load dumping on the DisCos whenever the TCN is having challenges managing energy on its grid, causing a myriad of commercial and technical problems.

The DisCos said these deficiencies of TCN were captured in a July 2017 System Adequacy Report published by the Independent System Operator, a section of TCN.

The body said a properly protected transmission system will isolate faults. “Unfortunately, the resultant effect is that we have experienced the ninth (9th) total black out in Nigeria this year (five times in January, once in April, twice in May and once in June), a rate of transmission failure that is in excess of one blackout per month – far beyond any international standard,” it said.

It reported further that over 100 partial and total transmission system collapses have … Read More...

TCN links grid collapse to multiple tripping of Onitsha ‎substation

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Transmission Company of Nigeria (TCN) says the collapse of the National Grid on May 8 at 14:32 hours was caused by a multiple tripping around its substation in Onitsha, Anambra State.
Managing director of TCN, Mohammed Usman, said this at a news conference in Abuja on Friday.
The national electricity grid had on Wednesday experience some disturbance resulting in reduction of electricity allocation to electricity distribution companies in the country.
Mohammed said the collapse might also had been triggered because of one of the generators that went off, saying, “What happened a day before yesterday at 14:32 hours was a case of system collapse, we had tripping.
“The reason for the grid collapse was that there was a multiple tripping around Onitsha substation; we are also suspecting that that one of the generator went out. We have sent our team of engineers to go and investigate, we normally investigate this kind of disturbances.’’
He, however, said despite the fragile nature of the nation’s power grid, the TCN had archived some level of stability on the national grid.
“Although, we have achieved some level of stability on the grid through the massive investment that we have done in the last two years.
“It does not mean that our grid has become disturbance free, because our grid is still very fragile, it is a journey that we are in that will take us to have a modern and stabilised grid.
“You remember, I had told you that we need to archive four important things to have a stabilised grid.
“We need to have critical investment in lines and substations so that we put N-1 across the country, that will ensure that any equipment that goes out at any point in time will not affect supply on that